* include/Makefile.am: Add optional to exported headers.
* include/Makefile.in: Likewise.
* include/std/optional: New.
* testsuite/20_util/optional/typedefs.cc: Likewise.
* testsuite/20_util/optional/relops/2.cc: Likewise.
* testsuite/20_util/optional/relops/3.cc: Likewise.
* testsuite/20_util/optional/relops/4.cc: Likewise.
* testsuite/20_util/optional/relops/5.cc: Likewise.
* testsuite/20_util/optional/relops/1.cc: Likewise.
* testsuite/20_util/optional/relops/6.cc: Likewise.
* testsuite/20_util/optional/nullopt.cc: Likewise.
* testsuite/20_util/optional/in_place.cc: Likewise.
* testsuite/20_util/optional/make_optional.cc: Likewise.
* testsuite/20_util/optional/assignment/2.cc: Likewise.
* testsuite/20_util/optional/assignment/3.cc: Likewise.
* testsuite/20_util/optional/assignment/4.cc: Likewise.
* testsuite/20_util/optional/assignment/5.cc: Likewise.
* testsuite/20_util/optional/assignment/1.cc: Likewise.
* testsuite/20_util/optional/assignment/6.cc: Likewise.
* testsuite/20_util/optional/cons/value_neg.cc: Likewise.
* testsuite/20_util/optional/cons/default.cc: Likewise.
* testsuite/20_util/optional/cons/move.cc: Likewise.
* testsuite/20_util/optional/cons/value.cc: Likewise.
* testsuite/20_util/optional/cons/copy.cc: Likewise.
* testsuite/20_util/optional/requirements.cc: Likewise.
* testsuite/20_util/optional/observers/2.cc: Likewise.
* testsuite/20_util/optional/observers/3.cc: Likewise.
* testsuite/20_util/optional/observers/4.cc: Likewise.
* testsuite/20_util/optional/observers/5.cc: Likewise.
* testsuite/20_util/optional/observers/1.cc: Likewise.
* testsuite/20_util/optional/constexpr/relops/2.cc: Likewise.
* testsuite/20_util/optional/constexpr/relops/3.cc: Likewise.
* testsuite/20_util/optional/constexpr/relops/4.cc: Likewise.
* testsuite/20_util/optional/constexpr/relops/5.cc: Likewise.
* testsuite/20_util/optional/constexpr/relops/1.cc: Likewise.
* testsuite/20_util/optional/constexpr/relops/6.cc: Likewise.
* testsuite/20_util/optional/constexpr/nullopt.cc: Likewise.
* testsuite/20_util/optional/constexpr/in_place.cc: Likewise.
* testsuite/20_util/optional/constexpr/make_optional.cc: Likewise.
* testsuite/20_util/optional/constexpr/cons/default.cc: Likewise.
* testsuite/20_util/optional/constexpr/cons/value.cc: Likewise.
* testsuite/20_util/optional/constexpr/observers/2.cc: Likewise.
* testsuite/20_util/optional/constexpr/observers/3.cc: Likewise.
* testsuite/20_util/optional/constexpr/observers/4.cc: Likewise.
* testsuite/20_util/optional/constexpr/observers/5.cc: Likewise.
* testsuite/20_util/optional/constexpr/observers/1.cc: Likewise.
* testsuite/20_util/optional/swap/1.cc: Likewise.
From-SVN: r238197
+2016-07-10 Ville Voutilainen <ville.voutilainen@gmail.com>
+
+ Implement std::optional.
+ * include/Makefile.am: Add optional to exported headers.
+ * include/Makefile.in: Likewise.
+ * include/std/optional: New.
+ * testsuite/20_util/optional/typedefs.cc: Likewise.
+ * testsuite/20_util/optional/relops/2.cc: Likewise.
+ * testsuite/20_util/optional/relops/3.cc: Likewise.
+ * testsuite/20_util/optional/relops/4.cc: Likewise.
+ * testsuite/20_util/optional/relops/5.cc: Likewise.
+ * testsuite/20_util/optional/relops/1.cc: Likewise.
+ * testsuite/20_util/optional/relops/6.cc: Likewise.
+ * testsuite/20_util/optional/nullopt.cc: Likewise.
+ * testsuite/20_util/optional/in_place.cc: Likewise.
+ * testsuite/20_util/optional/make_optional.cc: Likewise.
+ * testsuite/20_util/optional/assignment/2.cc: Likewise.
+ * testsuite/20_util/optional/assignment/3.cc: Likewise.
+ * testsuite/20_util/optional/assignment/4.cc: Likewise.
+ * testsuite/20_util/optional/assignment/5.cc: Likewise.
+ * testsuite/20_util/optional/assignment/1.cc: Likewise.
+ * testsuite/20_util/optional/assignment/6.cc: Likewise.
+ * testsuite/20_util/optional/cons/value_neg.cc: Likewise.
+ * testsuite/20_util/optional/cons/default.cc: Likewise.
+ * testsuite/20_util/optional/cons/move.cc: Likewise.
+ * testsuite/20_util/optional/cons/value.cc: Likewise.
+ * testsuite/20_util/optional/cons/copy.cc: Likewise.
+ * testsuite/20_util/optional/requirements.cc: Likewise.
+ * testsuite/20_util/optional/observers/2.cc: Likewise.
+ * testsuite/20_util/optional/observers/3.cc: Likewise.
+ * testsuite/20_util/optional/observers/4.cc: Likewise.
+ * testsuite/20_util/optional/observers/5.cc: Likewise.
+ * testsuite/20_util/optional/observers/1.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/relops/2.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/relops/3.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/relops/4.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/relops/5.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/relops/1.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/relops/6.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/nullopt.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/in_place.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/make_optional.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/cons/default.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/cons/value.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/observers/2.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/observers/3.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/observers/4.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/observers/5.cc: Likewise.
+ * testsuite/20_util/optional/constexpr/observers/1.cc: Likewise.
+ * testsuite/20_util/optional/swap/1.cc: Likewise.
+
2016-07-08 Jonathan Wakely <jwakely@redhat.com>
* testsuite/23_containers/vector/modifiers/insert/aliasing.cc: New.
${std_srcdir}/memory \
${std_srcdir}/mutex \
${std_srcdir}/numeric \
+ ${std_srcdir}/optional \
${std_srcdir}/ostream \
${std_srcdir}/queue \
${std_srcdir}/random \
${std_srcdir}/memory \
${std_srcdir}/mutex \
${std_srcdir}/numeric \
+ ${std_srcdir}/optional \
${std_srcdir}/ostream \
${std_srcdir}/queue \
${std_srcdir}/random \
--- /dev/null
+// <optional> -*- C++ -*-
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/optional
+ * This is a Standard C++ Library header.
+ */
+
+#ifndef _GLIBCXX_OPTIONAL
+#define _GLIBCXX_OPTIONAL 1
+
+#if __cplusplus <= 201402L
+# include <bits/c++17_warning.h>
+#else
+
+#include <utility>
+#include <type_traits>
+#include <stdexcept>
+#include <new>
+#include <initializer_list>
+#include <bits/functexcept.h>
+#include <bits/functional_hash.h>
+#include <bits/enable_special_members.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @addtogroup utilities
+ * @{
+ */
+
+ // All subsequent [X.Y.n] references are against n3793.
+
+ // [X.Y.4]
+ template<typename _Tp>
+ class optional;
+
+ // [X.Y.5]
+ /// Tag type for in-place construction.
+ struct in_place_t { };
+
+ /// Tag for in-place construction.
+ constexpr in_place_t in_place { };
+
+ // [X.Y.6]
+ /// Tag type to disengage optional objects.
+ struct nullopt_t
+ {
+ // Do not user-declare default constructor at all for
+ // optional_value = {} syntax to work.
+ // nullopt_t() = delete;
+
+ // Used for constructing nullopt.
+ enum class _Construct { _Token };
+
+ // Must be constexpr for nullopt_t to be literal.
+ explicit constexpr nullopt_t(_Construct) { }
+ };
+
+ // [X.Y.6]
+ /// Tag to disengage optional objects.
+ constexpr nullopt_t nullopt { nullopt_t::_Construct::_Token };
+
+ // [X.Y.7]
+ /**
+ * @brief Exception class thrown when a disengaged optional object is
+ * dereferenced.
+ * @ingroup exceptions
+ */
+ class bad_optional_access : public logic_error
+ {
+ public:
+ bad_optional_access() : logic_error("bad optional access") { }
+
+ // XXX This constructor is non-standard. Should not be inline
+ explicit bad_optional_access(const char* __arg) : logic_error(__arg) { }
+
+ virtual ~bad_optional_access() noexcept = default;
+ };
+
+ void
+ __throw_bad_optional_access(const char*)
+ __attribute__((__noreturn__));
+
+ // XXX Does not belong here.
+ inline void
+ __throw_bad_optional_access(const char* __s)
+ { _GLIBCXX_THROW_OR_ABORT(bad_optional_access(__s)); }
+
+ template<typename _Tp, typename = void>
+ struct _Has_addressof_mem : std::false_type { };
+
+ template<typename _Tp>
+ struct _Has_addressof_mem<_Tp,
+ __void_t<decltype( std::declval<const _Tp&>().operator&() )>
+ >
+ : std::true_type { };
+
+ template<typename _Tp, typename = void>
+ struct _Has_addressof_free : std::false_type { };
+
+ template<typename _Tp>
+ struct _Has_addressof_free<_Tp,
+ __void_t<decltype( operator&(std::declval<const _Tp&>()) )>
+ >
+ : std::true_type { };
+
+ /**
+ * @brief Trait that detects the presence of an overloaded unary operator&.
+ *
+ * Practically speaking this detects the presence of such an operator when
+ * called on a const-qualified lvalue (i.e.
+ * declval<_Tp * const&>().operator&()).
+ */
+ template<typename _Tp>
+ struct _Has_addressof
+ : std::__or_<_Has_addressof_mem<_Tp>, _Has_addressof_free<_Tp>>::type
+ { };
+
+ /**
+ * @brief An overload that attempts to take the address of an lvalue as a
+ * constant expression. Falls back to __addressof in the presence of an
+ * overloaded addressof operator (unary operator&), in which case the call
+ * will not be a constant expression.
+ */
+ template<typename _Tp, enable_if_t<!_Has_addressof<_Tp>::value, int>...>
+ constexpr _Tp* __constexpr_addressof(_Tp& __t)
+ { return &__t; }
+
+ /**
+ * @brief Fallback overload that defers to __addressof.
+ */
+ template<typename _Tp, enable_if_t<_Has_addressof<_Tp>::value, int>...>
+ inline _Tp* __constexpr_addressof(_Tp& __t)
+ { return std::__addressof(__t); }
+
+ /**
+ * @brief Class template that holds the necessary state for @ref optional
+ * and that has the responsibility for construction and the special members.
+ *
+ * Such a separate base class template is necessary in order to
+ * conditionally enable the special members (e.g. copy/move constructors).
+ * Note that this means that @ref _Optional_base implements the
+ * functionality for copy and move assignment, but not for converting
+ * assignment.
+ *
+ * @see optional, _Enable_special_members
+ */
+ template<typename _Tp, bool _ShouldProvideDestructor =
+ !is_trivially_destructible<_Tp>::value>
+ class _Optional_base
+ {
+ private:
+ // Remove const to avoid prohibition of reusing object storage for
+ // const-qualified types in [3.8/9]. This is strictly internal
+ // and even optional itself is oblivious to it.
+ using _Stored_type = remove_const_t<_Tp>;
+
+ public:
+ // [X.Y.4.1] Constructors.
+
+ // Constructors for disengaged optionals.
+ constexpr _Optional_base() noexcept
+ : _M_empty{} { }
+
+ constexpr _Optional_base(nullopt_t) noexcept
+ : _Optional_base{} { }
+
+ // Constructors for engaged optionals.
+ constexpr _Optional_base(const _Tp& __t)
+ : _M_payload(__t), _M_engaged(true) { }
+
+ constexpr _Optional_base(_Tp&& __t)
+ : _M_payload(std::move(__t)), _M_engaged(true) { }
+
+ template<typename... _Args>
+ constexpr explicit _Optional_base(in_place_t, _Args&&... __args)
+ : _M_payload(std::forward<_Args>(__args)...), _M_engaged(true) { }
+
+ template<typename _Up, typename... _Args,
+ enable_if_t<is_constructible<_Tp,
+ initializer_list<_Up>&,
+ _Args&&...>::value,
+ int>...>
+ constexpr explicit _Optional_base(in_place_t,
+ initializer_list<_Up> __il,
+ _Args&&... __args)
+ : _M_payload(__il, std::forward<_Args>(__args)...),
+ _M_engaged(true) { }
+
+ // Copy and move constructors.
+ _Optional_base(const _Optional_base& __other)
+ {
+ if (__other._M_engaged)
+ this->_M_construct(__other._M_get());
+ }
+
+ _Optional_base(_Optional_base&& __other)
+ noexcept(is_nothrow_move_constructible<_Tp>())
+ {
+ if (__other._M_engaged)
+ this->_M_construct(std::move(__other._M_get()));
+ }
+
+ // [X.Y.4.3] (partly) Assignment.
+ _Optional_base&
+ operator=(const _Optional_base& __other)
+ {
+ if (this->_M_engaged && __other._M_engaged)
+ this->_M_get() = __other._M_get();
+ else
+ {
+ if (__other._M_engaged)
+ this->_M_construct(__other._M_get());
+ else
+ this->_M_reset();
+ }
+
+ return *this;
+ }
+
+ _Optional_base&
+ operator=(_Optional_base&& __other)
+ noexcept(__and_<is_nothrow_move_constructible<_Tp>,
+ is_nothrow_move_assignable<_Tp>>())
+ {
+ if (this->_M_engaged && __other._M_engaged)
+ this->_M_get() = std::move(__other._M_get());
+ else
+ {
+ if (__other._M_engaged)
+ this->_M_construct(std::move(__other._M_get()));
+ else
+ this->_M_reset();
+ }
+ return *this;
+ }
+
+ // [X.Y.4.2] Destructor.
+ ~_Optional_base()
+ {
+ if (this->_M_engaged)
+ this->_M_payload.~_Stored_type();
+ }
+
+ // The following functionality is also needed by optional, hence the
+ // protected accessibility.
+ protected:
+ constexpr bool _M_is_engaged() const noexcept
+ { return this->_M_engaged; }
+
+ // The _M_get operations have _M_engaged as a precondition.
+ constexpr _Tp&
+ _M_get() noexcept
+ { return _M_payload; }
+
+ constexpr const _Tp&
+ _M_get() const noexcept
+ { return _M_payload; }
+
+ // The _M_construct operation has !_M_engaged as a precondition
+ // while _M_destruct has _M_engaged as a precondition.
+ template<typename... _Args>
+ void
+ _M_construct(_Args&&... __args)
+ noexcept(is_nothrow_constructible<_Stored_type, _Args...>())
+ {
+ ::new (std::__addressof(this->_M_payload))
+ _Stored_type(std::forward<_Args>(__args)...);
+ this->_M_engaged = true;
+ }
+
+ void
+ _M_destruct()
+ {
+ this->_M_engaged = false;
+ this->_M_payload.~_Stored_type();
+ }
+
+ // _M_reset is a 'safe' operation with no precondition.
+ void
+ _M_reset()
+ {
+ if (this->_M_engaged)
+ this->_M_destruct();
+ }
+
+ private:
+ struct _Empty_byte { };
+ union {
+ _Empty_byte _M_empty;
+ _Stored_type _M_payload;
+ };
+ bool _M_engaged = false;
+ };
+
+ /// Partial specialization that is exactly identical to the primary template
+ /// save for not providing a destructor, to fulfill triviality requirements.
+ template<typename _Tp>
+ class _Optional_base<_Tp, false>
+ {
+ private:
+ using _Stored_type = remove_const_t<_Tp>;
+
+ public:
+ constexpr _Optional_base() noexcept
+ : _M_empty{} { }
+
+ constexpr _Optional_base(nullopt_t) noexcept
+ : _Optional_base{} { }
+
+ constexpr _Optional_base(const _Tp& __t)
+ : _M_payload(__t), _M_engaged(true) { }
+
+ constexpr _Optional_base(_Tp&& __t)
+ : _M_payload(std::move(__t)), _M_engaged(true) { }
+
+ template<typename... _Args>
+ constexpr explicit _Optional_base(in_place_t, _Args&&... __args)
+ : _M_payload(std::forward<_Args>(__args)...), _M_engaged(true) { }
+
+ template<typename _Up, typename... _Args,
+ enable_if_t<is_constructible<_Tp,
+ initializer_list<_Up>&,
+ _Args&&...>::value,
+ int>...>
+ constexpr explicit _Optional_base(in_place_t,
+ initializer_list<_Up> __il,
+ _Args&&... __args)
+ : _M_payload(__il, std::forward<_Args>(__args)...),
+ _M_engaged(true) { }
+
+ _Optional_base(const _Optional_base& __other)
+ {
+ if (__other._M_engaged)
+ this->_M_construct(__other._M_get());
+ }
+
+ _Optional_base(_Optional_base&& __other)
+ noexcept(is_nothrow_move_constructible<_Tp>())
+ {
+ if (__other._M_engaged)
+ this->_M_construct(std::move(__other._M_get()));
+ }
+
+ _Optional_base&
+ operator=(const _Optional_base& __other)
+ {
+ if (this->_M_engaged && __other._M_engaged)
+ this->_M_get() = __other._M_get();
+ else
+ {
+ if (__other._M_engaged)
+ this->_M_construct(__other._M_get());
+ else
+ this->_M_reset();
+ }
+ return *this;
+ }
+
+ _Optional_base&
+ operator=(_Optional_base&& __other)
+ noexcept(__and_<is_nothrow_move_constructible<_Tp>,
+ is_nothrow_move_assignable<_Tp>>())
+ {
+ if (this->_M_engaged && __other._M_engaged)
+ this->_M_get() = std::move(__other._M_get());
+ else
+ {
+ if (__other._M_engaged)
+ this->_M_construct(std::move(__other._M_get()));
+ else
+ this->_M_reset();
+ }
+ return *this;
+ }
+
+ // Sole difference
+ // ~_Optional_base() noexcept = default;
+
+ protected:
+ constexpr bool _M_is_engaged() const noexcept
+ { return this->_M_engaged; }
+
+ _Tp&
+ _M_get() noexcept
+ { return _M_payload; }
+
+ constexpr const _Tp&
+ _M_get() const noexcept
+ { return _M_payload; }
+
+ template<typename... _Args>
+ void
+ _M_construct(_Args&&... __args)
+ noexcept(is_nothrow_constructible<_Stored_type, _Args...>())
+ {
+ ::new (std::__addressof(this->_M_payload))
+ _Stored_type(std::forward<_Args>(__args)...);
+ this->_M_engaged = true;
+ }
+
+ void
+ _M_destruct()
+ {
+ this->_M_engaged = false;
+ this->_M_payload.~_Stored_type();
+ }
+
+ void
+ _M_reset()
+ {
+ if (this->_M_engaged)
+ this->_M_destruct();
+ }
+
+ private:
+ struct _Empty_byte { };
+ union
+ {
+ _Empty_byte _M_empty;
+ _Stored_type _M_payload;
+ };
+ bool _M_engaged = false;
+ };
+
+ template<typename _Tp>
+ class optional;
+
+ template<typename>
+ struct __is_optional_impl : false_type
+ { };
+
+ template<typename _Tp>
+ struct __is_optional_impl<optional<_Tp>> : true_type
+ { };
+
+ template<typename _Tp>
+ struct __is_optional
+ : public __is_optional_impl<std::remove_cv_t<std::remove_reference_t<_Tp>>>
+ { };
+
+
+ /**
+ * @brief Class template for optional values.
+ */
+ template<typename _Tp>
+ class optional
+ : private _Optional_base<_Tp>,
+ private _Enable_copy_move<
+ // Copy constructor.
+ is_copy_constructible<_Tp>::value,
+ // Copy assignment.
+ __and_<is_copy_constructible<_Tp>, is_copy_assignable<_Tp>>::value,
+ // Move constructor.
+ is_move_constructible<_Tp>::value,
+ // Move assignment.
+ __and_<is_move_constructible<_Tp>, is_move_assignable<_Tp>>::value,
+ // Unique tag type.
+ optional<_Tp>>
+ {
+ static_assert(__and_<__not_<is_same<remove_cv_t<_Tp>, nullopt_t>>,
+ __not_<is_same<remove_cv_t<_Tp>, in_place_t>>,
+ __not_<is_reference<_Tp>>>(),
+ "Invalid instantiation of optional<T>");
+
+ private:
+ using _Base = _Optional_base<_Tp>;
+
+ public:
+ using value_type = _Tp;
+
+ // _Optional_base has the responsibility for construction.
+ using _Base::_Base;
+
+ constexpr optional() = default;
+ // Converting constructors for engaged optionals.
+ template <typename _Up,
+ enable_if_t<__and_<
+ __not_<is_same<_Tp, _Up>>,
+ is_constructible<_Tp, _Up&&>,
+ is_convertible<_Up&&, _Tp>
+ >::value, bool> = true>
+ constexpr optional(_Up&& __t)
+ : _Base(_Tp(std::forward<_Up>(__t))) { }
+
+ template <typename _Up,
+ enable_if_t<__and_<
+ __not_<is_same<_Tp, _Up>>,
+ is_constructible<_Tp, _Up&&>,
+ __not_<is_convertible<_Up&&, _Tp>>
+ >::value, bool> = false>
+ explicit constexpr optional(_Up&& __t)
+ : _Base(_Tp(std::forward<_Up>(__t))) { }
+
+ template <typename _Up,
+ enable_if_t<__and_<
+ __not_<is_same<_Tp, _Up>>,
+ __not_<is_constructible<
+ _Tp, const optional<_Up>&>>,
+ __not_<is_convertible<
+ const optional<_Up>&, _Tp>>,
+ is_constructible<_Tp, const _Up&>,
+ is_convertible<const _Up&, _Tp>
+ >::value, bool> = true>
+ constexpr optional(const optional<_Up>& __t)
+ : _Base(__t ? optional<_Tp>(*__t) : optional<_Tp>()) { }
+
+ template <typename _Up,
+ enable_if_t<__and_<
+ __not_<is_same<_Tp, _Up>>,
+ __not_<is_constructible<
+ _Tp, const optional<_Up>&>>,
+ __not_<is_convertible<
+ const optional<_Up>&, _Tp>>,
+ is_constructible<_Tp, const _Up&>,
+ __not_<is_convertible<const _Up&, _Tp>>
+ >::value, bool> = false>
+ explicit constexpr optional(const optional<_Up>& __t)
+ : _Base(__t ? optional<_Tp>(*__t) : optional<_Tp>()) { }
+
+ template <typename _Up,
+ enable_if_t<__and_<
+ __not_<is_same<_Tp, _Up>>,
+ __not_<is_constructible<
+ _Tp, optional<_Up>&&>>,
+ __not_<is_convertible<
+ optional<_Up>&&, _Tp>>,
+ is_constructible<_Tp, _Up&&>,
+ is_convertible<_Up&&, _Tp>
+ >::value, bool> = true>
+ constexpr optional(optional<_Up>&& __t)
+ : _Base(__t ? optional<_Tp>(std::move(*__t)) : optional<_Tp>()) { }
+
+ template <typename _Up,
+ enable_if_t<__and_<
+ __not_<is_same<_Tp, _Up>>,
+ __not_<is_constructible<
+ _Tp, optional<_Up>&&>>,
+ __not_<is_convertible<
+ optional<_Up>&&, _Tp>>,
+ is_constructible<_Tp, _Up&&>,
+ __not_<is_convertible<_Up&&, _Tp>>
+ >::value, bool> = false>
+ explicit constexpr optional(optional<_Up>&& __t)
+ : _Base(__t ? optional<_Tp>(std::move(*__t)) : optional<_Tp>()) { }
+
+ // [X.Y.4.3] (partly) Assignment.
+ optional&
+ operator=(nullopt_t) noexcept
+ {
+ this->_M_reset();
+ return *this;
+ }
+
+ template<typename _Up,
+ enable_if_t<__and_<
+ __not_<is_same<_Up, nullopt_t>>,
+ __not_<__is_optional<_Up>>>::value,
+ bool> = true>
+ optional&
+ operator=(_Up&& __u)
+ {
+ static_assert(__and_<is_constructible<_Tp, _Up>,
+ is_assignable<_Tp&, _Up>>(),
+ "Cannot assign to value type from argument");
+
+ if (this->_M_is_engaged())
+ this->_M_get() = std::forward<_Up>(__u);
+ else
+ this->_M_construct(std::forward<_Up>(__u));
+
+ return *this;
+ }
+
+ template<typename _Up,
+ enable_if_t<__and_<
+ __not_<is_same<_Tp, _Up>>>::value,
+ bool> = true>
+ optional&
+ operator=(const optional<_Up>& __u)
+ {
+ static_assert(__and_<is_constructible<_Tp, _Up>,
+ is_assignable<_Tp&, _Up>>(),
+ "Cannot assign to value type from argument");
+
+ if (__u)
+ {
+ if (this->_M_is_engaged())
+ this->_M_get() = *__u;
+ else
+ this->_M_construct(*__u);
+ }
+ else
+ {
+ this->_M_reset();
+ }
+ return *this;
+ }
+
+ template<typename _Up,
+ enable_if_t<__and_<
+ __not_<is_same<_Tp, _Up>>>::value,
+ bool> = true>
+ optional&
+ operator=(optional<_Up>&& __u)
+ {
+ static_assert(__and_<is_constructible<_Tp, _Up>,
+ is_assignable<_Tp&, _Up>>(),
+ "Cannot assign to value type from argument");
+
+ if (__u)
+ {
+ if (this->_M_is_engaged())
+ this->_M_get() = std::move(*__u);
+ else
+ this->_M_construct(std::move(*__u));
+ }
+ else
+ {
+ this->_M_reset();
+ }
+
+ return *this;
+ }
+
+ template<typename... _Args>
+ void
+ emplace(_Args&&... __args)
+ {
+ static_assert(is_constructible<_Tp, _Args&&...>(),
+ "Cannot emplace value type from arguments");
+
+ this->_M_reset();
+ this->_M_construct(std::forward<_Args>(__args)...);
+ }
+
+ template<typename _Up, typename... _Args>
+ enable_if_t<is_constructible<_Tp, initializer_list<_Up>&,
+ _Args&&...>::value>
+ emplace(initializer_list<_Up> __il, _Args&&... __args)
+ {
+ this->_M_reset();
+ this->_M_construct(__il, std::forward<_Args>(__args)...);
+ }
+
+ // [X.Y.4.2] Destructor is implicit, implemented in _Optional_base.
+
+ // [X.Y.4.4] Swap.
+ void
+ swap(optional& __other)
+ noexcept(is_nothrow_move_constructible<_Tp>()
+ && noexcept(swap(declval<_Tp&>(), declval<_Tp&>())))
+ {
+ using std::swap;
+
+ if (this->_M_is_engaged() && __other._M_is_engaged())
+ swap(this->_M_get(), __other._M_get());
+ else if (this->_M_is_engaged())
+ {
+ __other._M_construct(std::move(this->_M_get()));
+ this->_M_destruct();
+ }
+ else if (__other._M_is_engaged())
+ {
+ this->_M_construct(std::move(__other._M_get()));
+ __other._M_destruct();
+ }
+ }
+
+ // [X.Y.4.5] Observers.
+ constexpr const _Tp*
+ operator->() const
+ { return __constexpr_addressof(this->_M_get()); }
+
+ _Tp*
+ operator->()
+ { return std::__addressof(this->_M_get()); }
+
+ constexpr const _Tp&
+ operator*() const&
+ { return this->_M_get(); }
+
+ constexpr _Tp&
+ operator*()&
+ { return this->_M_get(); }
+
+ constexpr _Tp&&
+ operator*()&&
+ { return std::move(this->_M_get()); }
+
+ constexpr const _Tp&&
+ operator*() const&&
+ { return std::move(this->_M_get()); }
+
+ constexpr explicit operator bool() const noexcept
+ { return this->_M_is_engaged(); }
+
+ constexpr const _Tp&
+ value() const&
+ {
+ return this->_M_is_engaged()
+ ? this->_M_get()
+ : (__throw_bad_optional_access("Attempt to access value of a "
+ "disengaged optional object"),
+ this->_M_get());
+ }
+
+ constexpr _Tp&
+ value()&
+ {
+ return this->_M_is_engaged()
+ ? this->_M_get()
+ : (__throw_bad_optional_access("Attempt to access value of a "
+ "disengaged optional object"),
+ this->_M_get());
+ }
+
+ constexpr _Tp&&
+ value()&&
+ {
+ return this->_M_is_engaged()
+ ? std::move(this->_M_get())
+ : (__throw_bad_optional_access("Attempt to access value of a "
+ "disengaged optional object"),
+ std::move(this->_M_get()));
+ }
+
+ constexpr const _Tp&&
+ value() const&&
+ {
+ return this->_M_is_engaged()
+ ? std::move(this->_M_get())
+ : (__throw_bad_optional_access("Attempt to access value of a "
+ "disengaged optional object"),
+ std::move(this->_M_get()));
+ }
+
+ template<typename _Up>
+ constexpr _Tp
+ value_or(_Up&& __u) const&
+ {
+ static_assert(__and_<is_copy_constructible<_Tp>,
+ is_convertible<_Up&&, _Tp>>(),
+ "Cannot return value");
+
+ return this->_M_is_engaged()
+ ? this->_M_get()
+ : static_cast<_Tp>(std::forward<_Up>(__u));
+ }
+
+ template<typename _Up>
+ _Tp
+ value_or(_Up&& __u) &&
+ {
+ static_assert(__and_<is_move_constructible<_Tp>,
+ is_convertible<_Up&&, _Tp>>(),
+ "Cannot return value" );
+
+ return this->_M_is_engaged()
+ ? std::move(this->_M_get())
+ : static_cast<_Tp>(std::forward<_Up>(__u));
+ }
+ };
+
+ // [X.Y.8] Comparisons between optional values.
+ template<typename _Tp>
+ constexpr bool
+ operator==(const optional<_Tp>& __lhs, const optional<_Tp>& __rhs)
+ {
+ return static_cast<bool>(__lhs) == static_cast<bool>(__rhs)
+ && (!__lhs || *__lhs == *__rhs);
+ }
+
+ template<typename _Tp>
+ constexpr bool
+ operator!=(const optional<_Tp>& __lhs, const optional<_Tp>& __rhs)
+ { return !(__lhs == __rhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<(const optional<_Tp>& __lhs, const optional<_Tp>& __rhs)
+ {
+ return static_cast<bool>(__rhs) && (!__lhs || *__lhs < *__rhs);
+ }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>(const optional<_Tp>& __lhs, const optional<_Tp>& __rhs)
+ { return __rhs < __lhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<=(const optional<_Tp>& __lhs, const optional<_Tp>& __rhs)
+ { return !(__rhs < __lhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>=(const optional<_Tp>& __lhs, const optional<_Tp>& __rhs)
+ { return !(__lhs < __rhs); }
+
+ // [X.Y.9] Comparisons with nullopt.
+ template<typename _Tp>
+ constexpr bool
+ operator==(const optional<_Tp>& __lhs, nullopt_t) noexcept
+ { return !__lhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator==(nullopt_t, const optional<_Tp>& __rhs) noexcept
+ { return !__rhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator!=(const optional<_Tp>& __lhs, nullopt_t) noexcept
+ { return static_cast<bool>(__lhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator!=(nullopt_t, const optional<_Tp>& __rhs) noexcept
+ { return static_cast<bool>(__rhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<(const optional<_Tp>& /* __lhs */, nullopt_t) noexcept
+ { return false; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<(nullopt_t, const optional<_Tp>& __rhs) noexcept
+ { return static_cast<bool>(__rhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>(const optional<_Tp>& __lhs, nullopt_t) noexcept
+ { return static_cast<bool>(__lhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>(nullopt_t, const optional<_Tp>& /* __rhs */) noexcept
+ { return false; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<=(const optional<_Tp>& __lhs, nullopt_t) noexcept
+ { return !__lhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<=(nullopt_t, const optional<_Tp>& /* __rhs */) noexcept
+ { return true; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>=(const optional<_Tp>& /* __lhs */, nullopt_t) noexcept
+ { return true; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>=(nullopt_t, const optional<_Tp>& __rhs) noexcept
+ { return !__rhs; }
+
+ // [X.Y.10] Comparisons with value type.
+ template<typename _Tp>
+ constexpr bool
+ operator==(const optional<_Tp>& __lhs, const _Tp& __rhs)
+ { return __lhs && *__lhs == __rhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator==(const _Tp& __lhs, const optional<_Tp>& __rhs)
+ { return __rhs && __lhs == *__rhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator!=(const optional<_Tp>& __lhs, _Tp const& __rhs)
+ { return !__lhs || !(*__lhs == __rhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator!=(const _Tp& __lhs, const optional<_Tp>& __rhs)
+ { return !__rhs || !(__lhs == *__rhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<(const optional<_Tp>& __lhs, const _Tp& __rhs)
+ { return !__lhs || *__lhs < __rhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<(const _Tp& __lhs, const optional<_Tp>& __rhs)
+ { return __rhs && __lhs < *__rhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>(const optional<_Tp>& __lhs, const _Tp& __rhs)
+ { return __lhs && __rhs < *__lhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>(const _Tp& __lhs, const optional<_Tp>& __rhs)
+ { return !__rhs || *__rhs < __lhs; }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<=(const optional<_Tp>& __lhs, const _Tp& __rhs)
+ { return !__lhs || !(__rhs < *__lhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator<=(const _Tp& __lhs, const optional<_Tp>& __rhs)
+ { return __rhs && !(*__rhs < __lhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>=(const optional<_Tp>& __lhs, const _Tp& __rhs)
+ { return __lhs && !(*__lhs < __rhs); }
+
+ template<typename _Tp>
+ constexpr bool
+ operator>=(const _Tp& __lhs, const optional<_Tp>& __rhs)
+ { return !__rhs || !(__lhs < *__rhs); }
+
+ // [X.Y.11]
+ template<typename _Tp>
+ inline void
+ swap(optional<_Tp>& __lhs, optional<_Tp>& __rhs)
+ noexcept(noexcept(__lhs.swap(__rhs)))
+ { __lhs.swap(__rhs); }
+
+ template<typename _Tp>
+ constexpr optional<decay_t<_Tp>>
+ make_optional(_Tp&& __t)
+ { return optional<decay_t<_Tp>> { std::forward<_Tp>(__t) }; }
+
+ // [X.Y.12]
+ template<typename _Tp>
+ struct hash<optional<_Tp>>
+ {
+ using result_type = size_t;
+ using argument_type = optional<_Tp>;
+
+ size_t
+ operator()(const optional<_Tp>& __t) const
+ noexcept(noexcept(hash<_Tp> {}(*__t)))
+ {
+ // We pick an arbitrary hash for disengaged optionals which hopefully
+ // usual values of _Tp won't typically hash to.
+ constexpr size_t __magic_disengaged_hash = static_cast<size_t>(-3333);
+ return __t ? hash<_Tp> {}(*__t) : __magic_disengaged_hash;
+ }
+ };
+
+ /// @}
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+#endif // C++17
+
+#endif // _GLIBCXX_OPTIONAL
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct exception {};
+
+int counter = 0;
+
+struct mixin_counter
+{
+ mixin_counter() { ++counter; }
+ mixin_counter(mixin_counter const&) { ++counter; }
+ ~mixin_counter() { --counter; }
+};
+
+struct value_type : private mixin_counter
+{
+ enum state_type
+ {
+ zero,
+ moved_from,
+ throwing_construction,
+ throwing_copy,
+ throwing_copy_assignment,
+ throwing_move,
+ throwing_move_assignment,
+ threw,
+ };
+
+ value_type() = default;
+
+ explicit value_type(state_type state_)
+ : state(state_)
+ {
+ throw_if(throwing_construction);
+ }
+
+ value_type(value_type const& other)
+ : state(other.state)
+ {
+ throw_if(throwing_copy);
+ }
+
+ value_type&
+ operator=(value_type const& other)
+ {
+ state = other.state;
+ throw_if(throwing_copy_assignment);
+ return *this;
+ }
+
+ value_type(value_type&& other)
+ : state(other.state)
+ {
+ other.state = moved_from;
+ throw_if(throwing_move);
+ }
+
+ value_type&
+ operator=(value_type&& other)
+ {
+ state = other.state;
+ other.state = moved_from;
+ throw_if(throwing_move_assignment);
+ return *this;
+ }
+
+ void throw_if(state_type match)
+ {
+ if(state == match)
+ {
+ state = threw;
+ throw exception {};
+ }
+ }
+
+ state_type state = zero;
+};
+
+int main()
+{
+ using O = std::optional<value_type>;
+ using S = value_type::state_type;
+ auto const make = [](S s = S::zero) { return O { std::in_place, s }; };
+
+ enum outcome_type { nothrow, caught, bad_catch };
+
+ // Check copy/move assignment for disengaged optional
+
+ // From disengaged optional
+ {
+ O o;
+ VERIFY( !o );
+ O p;
+ o = p;
+ VERIFY( !o );
+ VERIFY( !p );
+ }
+
+ {
+ O o;
+ VERIFY( !o );
+ O p;
+ o = std::move(p);
+ VERIFY( !o );
+ VERIFY( !p );
+ }
+
+ {
+ O o;
+ VERIFY( !o );
+ o = {};
+ VERIFY( !o );
+ }
+
+ // From engaged optional
+ {
+ O o;
+ VERIFY( !o );
+ O p = make(S::throwing_copy_assignment);
+ o = p;
+ VERIFY( o && o->state == S::throwing_copy_assignment );
+ VERIFY( p && p->state == S::throwing_copy_assignment );
+ }
+
+ {
+ O o;
+ VERIFY( !o );
+ O p = make(S::throwing_move_assignment);
+ o = std::move(p);
+ VERIFY( o && o->state == S::throwing_move_assignment );
+ VERIFY( p && p->state == S::moved_from );
+ }
+
+ {
+ outcome_type outcome {};
+ O o;
+ VERIFY( !o );
+ O p = make(S::throwing_copy);
+
+ try
+ {
+ o = p;
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( outcome == caught );
+ VERIFY( !o );
+ VERIFY( p && p->state == S::throwing_copy );
+ }
+
+ {
+ outcome_type outcome {};
+ O o;
+ VERIFY( !o );
+ O p = make(S::throwing_move);
+
+ try
+ {
+ o = std::move(p);
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( outcome == caught );
+ VERIFY( !o );
+ VERIFY( p && p->state == S::moved_from );
+ }
+
+ VERIFY( counter == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct exception {};
+
+int counter = 0;
+
+struct mixin_counter
+{
+ mixin_counter() { ++counter; }
+ mixin_counter(mixin_counter const&) { ++counter; }
+ ~mixin_counter() { --counter; }
+};
+
+struct value_type : private mixin_counter
+{
+ enum state_type
+ {
+ zero,
+ moved_from,
+ throwing_construction,
+ throwing_copy,
+ throwing_copy_assignment,
+ throwing_move,
+ throwing_move_assignment,
+ threw,
+ };
+
+ value_type() = default;
+
+ explicit value_type(state_type state_)
+ : state(state_)
+ {
+ throw_if(throwing_construction);
+ }
+
+ value_type(value_type const& other)
+ : state(other.state)
+ {
+ throw_if(throwing_copy);
+ }
+
+ value_type&
+ operator=(value_type const& other)
+ {
+ state = other.state;
+ throw_if(throwing_copy_assignment);
+ return *this;
+ }
+
+ value_type(value_type&& other)
+ : state(other.state)
+ {
+ other.state = moved_from;
+ throw_if(throwing_move);
+ }
+
+ value_type&
+ operator=(value_type&& other)
+ {
+ state = other.state;
+ other.state = moved_from;
+ throw_if(throwing_move_assignment);
+ return *this;
+ }
+
+ void throw_if(state_type match)
+ {
+ if(state == match)
+ {
+ state = threw;
+ throw exception {};
+ }
+ }
+
+ state_type state = zero;
+};
+
+int main()
+{
+ using O = std::optional<value_type>;
+ using S = value_type::state_type;
+ auto const make = [](S s = S::zero) { return O { std::in_place, s }; };
+
+ enum outcome_type { nothrow, caught, bad_catch };
+
+ // Check copy/move assignment for engaged optional
+
+ // From disengaged optional
+ {
+ O o = make(S::zero);
+ VERIFY( o );
+ O p;
+ o = p;
+ VERIFY( !o );
+ VERIFY( !p );
+ }
+
+ {
+ O o = make(S::zero);
+ VERIFY( o );
+ O p;
+ o = std::move(p);
+ VERIFY( !o );
+ VERIFY( !p );
+ }
+
+ {
+ O o = make(S::zero);
+ VERIFY( o );
+ o = {};
+ VERIFY( !o );
+ }
+
+ // From engaged optional
+ {
+ O o = make(S::zero);
+ VERIFY( o );
+ O p = make(S::throwing_copy);
+ o = p;
+ VERIFY( o && o->state == S::throwing_copy);
+ VERIFY( p && p->state == S::throwing_copy);
+ }
+
+ {
+ O o = make(S::zero);
+ VERIFY( o );
+ O p = make(S::throwing_move);
+ o = std::move(p);
+ VERIFY( o && o->state == S::throwing_move);
+ VERIFY( p && p->state == S::moved_from);
+ }
+
+ {
+ outcome_type outcome {};
+ O o = make(S::zero);
+ VERIFY( o );
+ O p = make(S::throwing_copy_assignment);
+
+ try
+ {
+ o = p;
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( o && o->state == S::threw);
+ VERIFY( p && p->state == S::throwing_copy_assignment);
+ }
+
+ {
+ outcome_type outcome {};
+ O o = make(S::zero);
+ VERIFY( o );
+ O p = make(S::throwing_move_assignment);
+
+ try
+ {
+ o = std::move(p);
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( o && o->state == S::threw);
+ VERIFY( p && p->state == S::moved_from);
+ }
+
+ VERIFY( counter == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct exception {};
+
+int counter = 0;
+
+struct mixin_counter
+{
+ mixin_counter() { ++counter; }
+ mixin_counter(mixin_counter const&) { ++counter; }
+ ~mixin_counter() { --counter; }
+};
+
+struct value_type : private mixin_counter
+{
+ enum state_type
+ {
+ zero,
+ moved_from,
+ throwing_construction,
+ throwing_copy,
+ throwing_copy_assignment,
+ throwing_move,
+ throwing_move_assignment,
+ threw,
+ };
+
+ value_type() = default;
+
+ explicit value_type(state_type state_)
+ : state(state_)
+ {
+ throw_if(throwing_construction);
+ }
+
+ value_type(value_type const& other)
+ : state(other.state)
+ {
+ throw_if(throwing_copy);
+ }
+
+ value_type&
+ operator=(value_type const& other)
+ {
+ state = other.state;
+ throw_if(throwing_copy_assignment);
+ return *this;
+ }
+
+ value_type(value_type&& other)
+ : state(other.state)
+ {
+ other.state = moved_from;
+ throw_if(throwing_move);
+ }
+
+ value_type&
+ operator=(value_type&& other)
+ {
+ state = other.state;
+ other.state = moved_from;
+ throw_if(throwing_move_assignment);
+ return *this;
+ }
+
+ void throw_if(state_type match)
+ {
+ if(state == match)
+ {
+ state = threw;
+ throw exception {};
+ }
+ }
+
+ state_type state = zero;
+};
+
+int main()
+{
+ using O = std::optional<value_type>;
+ using S = value_type::state_type;
+ auto const make = [](S s = S::zero) { return value_type { s }; };
+
+ enum outcome_type { nothrow, caught, bad_catch };
+
+ // Check value assignment for disengaged optional
+
+ {
+ O o;
+ value_type v = make(S::throwing_copy_assignment);
+ o = v;
+ VERIFY( o && o->state == S::throwing_copy_assignment );
+ }
+
+ {
+ O o;
+ value_type v = make(S::throwing_move_assignment);
+ o = std::move(v);
+ VERIFY( o && o->state == S::throwing_move_assignment );
+ }
+
+ {
+ outcome_type outcome {};
+ O o;
+ value_type v = make(S::throwing_copy);
+
+ try
+ {
+ o = v;
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( !o );
+ }
+
+ {
+ outcome_type outcome {};
+ O o;
+ value_type v = make(S::throwing_move);
+
+ try
+ {
+ o = std::move(v);
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( !o );
+ }
+
+ VERIFY( counter == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct exception {};
+
+int counter = 0;
+
+struct mixin_counter
+{
+ mixin_counter() { ++counter; }
+ mixin_counter(mixin_counter const&) { ++counter; }
+ ~mixin_counter() { --counter; }
+};
+
+struct value_type : private mixin_counter
+{
+ enum state_type
+ {
+ zero,
+ moved_from,
+ throwing_construction,
+ throwing_copy,
+ throwing_copy_assignment,
+ throwing_move,
+ throwing_move_assignment,
+ threw,
+ };
+
+ value_type() = default;
+
+ explicit value_type(state_type state_)
+ : state(state_)
+ {
+ throw_if(throwing_construction);
+ }
+
+ value_type(value_type const& other)
+ : state(other.state)
+ {
+ throw_if(throwing_copy);
+ }
+
+ value_type&
+ operator=(value_type const& other)
+ {
+ state = other.state;
+ throw_if(throwing_copy_assignment);
+ return *this;
+ }
+
+ value_type(value_type&& other)
+ : state(other.state)
+ {
+ other.state = moved_from;
+ throw_if(throwing_move);
+ }
+
+ value_type&
+ operator=(value_type&& other)
+ {
+ state = other.state;
+ other.state = moved_from;
+ throw_if(throwing_move_assignment);
+ return *this;
+ }
+
+ void throw_if(state_type match)
+ {
+ if(state == match)
+ {
+ state = threw;
+ throw exception {};
+ }
+ }
+
+ state_type state = zero;
+};
+
+int main()
+{
+ using O = std::optional<value_type>;
+ using S = value_type::state_type;
+ auto const make = [](S s = S::zero) { return value_type { s }; };
+
+ enum outcome_type { nothrow, caught, bad_catch };
+
+ // Check value assignment for engaged optional
+
+ {
+ O o = make();
+ value_type v = make(S::throwing_copy);
+ o = v;
+ VERIFY( o && o->state == S::throwing_copy);
+ }
+
+ {
+ O o = make();
+ value_type v = make(S::throwing_move);
+ o = std::move(v);
+ VERIFY( o && o->state == S::throwing_move);
+ }
+
+ {
+ outcome_type outcome {};
+ O o = make();
+ value_type v = make(S::throwing_copy_assignment);
+
+ try
+ {
+ o = v;
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( o && o->state == S::threw );
+ }
+
+ {
+ outcome_type outcome {};
+ O o = make();
+ value_type v = make(S::throwing_move_assignment);
+
+ try
+ {
+ o = std::move(v);
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( o && o->state == S::threw );
+ }
+
+ VERIFY( counter == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+int counter = 0;
+
+struct mixin_counter
+{
+ mixin_counter() { ++counter; }
+ mixin_counter(mixin_counter const&) { ++counter; }
+ ~mixin_counter() { --counter; }
+};
+
+struct value_type : private mixin_counter { };
+
+int main()
+{
+ using O = std::optional<value_type>;
+
+ // Check std::nullopt_t and 'default' (= {}) assignment
+
+ {
+ O o;
+ o = std::nullopt;
+ VERIFY( !o );
+ }
+
+ {
+ O o { std::in_place };
+ o = std::nullopt;
+ VERIFY( !o );
+ }
+
+ {
+ O o;
+ o = {};
+ VERIFY( !o );
+ }
+
+ {
+ O o { std::in_place };
+ o = {};
+ VERIFY( !o );
+ }
+
+ VERIFY( counter == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+int counter = 0;
+
+struct mixin_counter
+{
+ mixin_counter() { ++counter; }
+ mixin_counter(mixin_counter const&) { ++counter; }
+ ~mixin_counter() { --counter; }
+};
+
+struct value_type : private mixin_counter
+{
+ value_type() = default;
+ value_type(int) : state(1) { }
+ value_type(std::initializer_list<char>, const char*) : state(2) { }
+ int state = 0;
+};
+
+int main()
+{
+ using O = std::optional<value_type>;
+
+ // Check emplace
+
+ {
+ O o;
+ o.emplace();
+ VERIFY( o && o->state == 0 );
+ }
+ {
+ O o { std::in_place, 0 };
+ o.emplace();
+ VERIFY( o && o->state == 0 );
+ }
+
+ {
+ O o;
+ o.emplace(0);
+ VERIFY( o && o->state == 1 );
+ }
+ {
+ O o { std::in_place };
+ o.emplace(0);
+ VERIFY( o && o->state == 1 );
+ }
+
+ {
+ O o;
+ o.emplace({ 'a' }, "");
+ VERIFY( o && o->state == 2 );
+ }
+ {
+ O o { std::in_place };
+ o.emplace({ 'a' }, "");
+ VERIFY( o && o->state == 2 );
+ }
+
+ static_assert( !std::is_constructible<O, std::initializer_list<int>, int>(), "" );
+
+ VERIFY( counter == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct tracker
+{
+ tracker(int value) : value(value) { ++count; }
+ ~tracker() { --count; }
+
+ tracker(tracker const& other) : value(other.value) { ++count; }
+ tracker(tracker&& other) : value(other.value)
+ {
+ other.value = -1;
+ ++count;
+ }
+
+ tracker& operator=(tracker const&) = default;
+ tracker& operator=(tracker&&) = default;
+
+ int value;
+
+ static int count;
+};
+
+int tracker::count = 0;
+
+struct exception { };
+
+struct throwing_copy
+{
+ throwing_copy() = default;
+ throwing_copy(throwing_copy const&) { throw exception {}; }
+};
+
+int main()
+{
+ // [20.5.4.1] Constructors
+
+ {
+ std::optional<long> o;
+ auto copy = o;
+ VERIFY( !copy );
+ VERIFY( !o );
+ }
+
+ {
+ const long val = 0x1234ABCD;
+ std::optional<long> o { std::in_place, val};
+ auto copy = o;
+ VERIFY( copy );
+ VERIFY( *copy == val );
+ VERIFY( o && o == val );
+ }
+
+ {
+ std::optional<tracker> o;
+ auto copy = o;
+ VERIFY( !copy );
+ VERIFY( tracker::count == 0 );
+ VERIFY( !o );
+ }
+
+ {
+ std::optional<tracker> o { std::in_place, 333 };
+ auto copy = o;
+ VERIFY( copy );
+ VERIFY( copy->value == 333 );
+ VERIFY( tracker::count == 2 );
+ VERIFY( o && o->value == 333 );
+ }
+
+ enum outcome { nothrow, caught, bad_catch };
+
+ {
+ outcome result = nothrow;
+ std::optional<throwing_copy> o;
+
+ try
+ {
+ auto copy = o;
+ }
+ catch(exception const&)
+ { result = caught; }
+ catch(...)
+ { result = bad_catch; }
+
+ VERIFY( result == nothrow );
+ }
+
+ {
+ outcome result = nothrow;
+ std::optional<throwing_copy> o { std::in_place };
+
+ try
+ {
+ auto copy = o;
+ }
+ catch(exception const&)
+ { result = caught; }
+ catch(...)
+ { result = bad_catch; }
+
+ VERIFY( result == caught );
+ }
+
+ VERIFY( tracker::count == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct tracker
+{
+ tracker() { ++count; }
+ ~tracker() { --count; }
+
+ tracker(tracker const&) { ++count; }
+ tracker(tracker&&) { ++count; }
+
+ tracker& operator=(tracker const&) = default;
+ tracker& operator=(tracker&&) = default;
+
+ static int count;
+};
+
+int tracker::count = 0;
+
+int main()
+{
+ // [20.5.4.1] Constructors
+
+ {
+ std::optional<tracker> o;
+ VERIFY( !o );
+ }
+
+ {
+ std::optional<tracker> o {};
+ VERIFY( !o );
+ }
+
+ {
+ std::optional<tracker> o = {};
+ VERIFY( !o );
+ }
+
+ VERIFY( tracker::count == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct tracker
+{
+ tracker(int value) : value(value) { ++count; }
+ ~tracker() { --count; }
+
+ tracker(tracker const& other) : value(other.value) { ++count; }
+ tracker(tracker&& other) : value(other.value)
+ {
+ other.value = -1;
+ ++count;
+ }
+
+ tracker& operator=(tracker const&) = default;
+ tracker& operator=(tracker&&) = default;
+
+ int value;
+
+ static int count;
+};
+
+int tracker::count = 0;
+
+struct exception { };
+
+struct throwing_move
+{
+ throwing_move() = default;
+ throwing_move(throwing_move const&) { throw exception {}; }
+};
+
+int main()
+{
+ // [20.5.4.1] Constructors
+
+ {
+ std::optional<long> o;
+ auto moved_to = std::move(o);
+ VERIFY( !moved_to );
+ VERIFY( !o );
+ }
+
+ {
+ const long val = 0x1234ABCD;
+ std::optional<long> o { std::in_place, val};
+ auto moved_to = std::move(o);
+ VERIFY( moved_to );
+ VERIFY( *moved_to == val );
+ VERIFY( o && *o == val );
+ }
+
+ {
+ std::optional<tracker> o;
+ auto moved_to = std::move(o);
+ VERIFY( !moved_to );
+ VERIFY( tracker::count == 0 );
+ VERIFY( !o );
+ }
+
+ {
+ std::optional<tracker> o { std::in_place, 333 };
+ auto moved_to = std::move(o);
+ VERIFY( moved_to );
+ VERIFY( moved_to->value == 333 );
+ VERIFY( tracker::count == 2 );
+ VERIFY( o && o->value == -1 );
+ }
+
+ enum outcome { nothrow, caught, bad_catch };
+
+ {
+ outcome result = nothrow;
+ std::optional<throwing_move> o;
+
+ try
+ {
+ auto moved_to = std::move(o);
+ }
+ catch(exception const&)
+ { result = caught; }
+ catch(...)
+ { result = bad_catch; }
+
+ VERIFY( result == nothrow );
+ }
+
+ {
+ outcome result = nothrow;
+ std::optional<throwing_move> o { std::in_place };
+
+ try
+ {
+ auto moved_to = std::move(o);
+ }
+ catch(exception const&)
+ { result = caught; }
+ catch(...)
+ { result = bad_catch; }
+
+ VERIFY( result == caught );
+ }
+
+ VERIFY( tracker::count == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <vector>
+#include <string>
+
+struct tracker
+{
+ tracker(int value) : value(value) { ++count; }
+ ~tracker() { --count; }
+
+ tracker(tracker const& other) : value(other.value) { ++count; }
+ tracker(tracker&& other) : value(other.value)
+ {
+ other.value = -1;
+ ++count;
+ }
+
+ tracker& operator=(tracker const&) = default;
+ tracker& operator=(tracker&&) = default;
+
+ int value;
+
+ static int count;
+};
+
+int tracker::count = 0;
+
+struct exception { };
+
+struct throwing_construction
+{
+ explicit throwing_construction(bool propagate) : propagate(propagate) { }
+
+ throwing_construction(throwing_construction const& other)
+ : propagate(other.propagate)
+ {
+ if(propagate)
+ throw exception {};
+ }
+
+ bool propagate;
+};
+
+int main()
+{
+ // [20.5.4.1] Constructors
+
+ {
+ auto i = 0x1234ABCD;
+ std::optional<long> o { i };
+ VERIFY( o );
+ VERIFY( *o == 0x1234ABCD );
+ VERIFY( i == 0x1234ABCD );
+ }
+
+ {
+ auto i = 0x1234ABCD;
+ std::optional<long> o = i;
+ VERIFY( o );
+ VERIFY( *o == 0x1234ABCD );
+ VERIFY( i == 0x1234ABCD );
+ }
+
+ {
+ auto i = 0x1234ABCD;
+ std::optional<long> o = { i };
+ VERIFY( o );
+ VERIFY( *o == 0x1234ABCD );
+ VERIFY( i == 0x1234ABCD );
+ }
+
+ {
+ auto i = 0x1234ABCD;
+ std::optional<long> o { std::move(i) };
+ VERIFY( o );
+ VERIFY( *o == 0x1234ABCD );
+ VERIFY( i == 0x1234ABCD );
+ }
+
+ {
+ auto i = 0x1234ABCD;
+ std::optional<long> o = std::move(i);
+ VERIFY( o );
+ VERIFY( *o == 0x1234ABCD );
+ VERIFY( i == 0x1234ABCD );
+ }
+
+ {
+ auto i = 0x1234ABCD;
+ std::optional<long> o = { std::move(i) };
+ VERIFY( o );
+ VERIFY( *o == 0x1234ABCD );
+ VERIFY( i == 0x1234ABCD );
+ }
+
+ {
+ std::vector<int> v = { 0, 1, 2, 3, 4, 5 };
+ std::optional<std::vector<int>> o { v };
+ VERIFY( !v.empty() );
+ VERIFY( o->size() == 6 );
+ }
+
+ {
+ std::vector<int> v = { 0, 1, 2, 3, 4, 5 };
+ std::optional<std::vector<int>> o = v;
+ VERIFY( !v.empty() );
+ VERIFY( o->size() == 6 );
+ }
+
+ {
+ std::vector<int> v = { 0, 1, 2, 3, 4, 5 };
+ std::optional<std::vector<int>> o { v };
+ VERIFY( !v.empty() );
+ VERIFY( o->size() == 6 );
+ }
+
+ {
+ std::vector<int> v = { 0, 1, 2, 3, 4, 5 };
+ std::optional<std::vector<int>> o { std::move(v) };
+ VERIFY( v.empty() );
+ VERIFY( o->size() == 6 );
+ }
+
+ {
+ std::vector<int> v = { 0, 1, 2, 3, 4, 5 };
+ std::optional<std::vector<int>> o = std::move(v);
+ VERIFY( v.empty() );
+ VERIFY( o->size() == 6 );
+ }
+
+ {
+ std::vector<int> v = { 0, 1, 2, 3, 4, 5 };
+ std::optional<std::vector<int>> o { std::move(v) };
+ VERIFY( v.empty() );
+ VERIFY( o->size() == 6 );
+ }
+
+ {
+ tracker t { 333 };
+ std::optional<tracker> o = t;
+ VERIFY( o->value == 333 );
+ VERIFY( tracker::count == 2 );
+ VERIFY( t.value == 333 );
+ }
+
+ {
+ tracker t { 333 };
+ std::optional<tracker> o = std::move(t);
+ VERIFY( o->value == 333 );
+ VERIFY( tracker::count == 2 );
+ VERIFY( t.value == -1 );
+ }
+
+ enum outcome { nothrow, caught, bad_catch };
+
+ {
+ outcome result = nothrow;
+ throwing_construction t { false };
+
+ try
+ {
+ std::optional<throwing_construction> o { t };
+ }
+ catch(exception const&)
+ { result = caught; }
+ catch(...)
+ { result = bad_catch; }
+
+ VERIFY( result == nothrow );
+ }
+
+ {
+ outcome result = nothrow;
+ throwing_construction t { true };
+
+ try
+ {
+ std::optional<throwing_construction> o { t };
+ }
+ catch(exception const&)
+ { result = caught; }
+ catch(...)
+ { result = bad_catch; }
+
+ VERIFY( result == caught );
+ }
+
+ {
+ outcome result = nothrow;
+ throwing_construction t { false };
+
+ try
+ {
+ std::optional<throwing_construction> o { std::move(t) };
+ }
+ catch(exception const&)
+ { result = caught; }
+ catch(...)
+ { result = bad_catch; }
+
+ VERIFY( result == nothrow );
+ }
+
+ {
+ outcome result = nothrow;
+ throwing_construction t { true };
+
+ try
+ {
+ std::optional<throwing_construction> o { std::move(t) };
+ }
+ catch(exception const&)
+ { result = caught; }
+ catch(...)
+ { result = bad_catch; }
+
+ VERIFY( result == caught );
+ }
+
+ {
+ std::optional<std::string> os = "foo";
+ struct X
+ {
+ explicit X(int) {}
+ X& operator=(int) {return *this;}
+ };
+ std::optional<X> ox{42};
+ std::optional<int> oi{42};
+ std::optional<X> ox2{oi};
+ std::optional<std::string> os2;
+ os2 = "foo";
+ std::optional<X> ox3;
+ ox3 = 42;
+ std::optional<X> ox4;
+ ox4 = oi;
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <string>
+#include <memory>
+
+int main()
+{
+ {
+ struct X
+ {
+ explicit X(int) {}
+ };
+ std::optional<X> ox{42};
+ std::optional<X> ox2 = 42; // { dg-error "conversion" }
+ std::optional<std::unique_ptr<int>> oup{new int};
+ std::optional<std::unique_ptr<int>> oup2 = new int; // { dg-error "conversion" }
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+int main()
+{
+ // [20.5.4.1] Constructors
+
+ {
+ constexpr std::optional<int> o;
+ static_assert( !o, "" );
+ }
+
+ {
+ constexpr std::optional<int> o {};
+ static_assert( !o, "" );
+ }
+
+ {
+ constexpr std::optional<int> o = {};
+ static_assert( !o, "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+int main()
+{
+ // [20.5.4.1] Constructors
+
+ {
+ constexpr long i = 0x1234ABCD;
+ constexpr std::optional<long> o { i };
+ static_assert( o, "" );
+ static_assert( *o == 0x1234ABCD, "" );
+ }
+
+ {
+ constexpr long i = 0x1234ABCD;
+ constexpr std::optional<long> o = i;
+ static_assert( o, "" );
+ static_assert( *o == 0x1234ABCD, "" );
+ }
+
+ {
+ constexpr long i = 0x1234ABCD;
+ constexpr std::optional<long> o = { i };
+ static_assert( o, "" );
+ static_assert( *o == 0x1234ABCD, "" );
+ }
+
+ {
+ constexpr long i = 0x1234ABCD;
+ constexpr std::optional<long> o { std::move(i) };
+ static_assert( o, "" );
+ static_assert( *o == 0x1234ABCD, "" );
+ }
+
+ {
+ constexpr long i = 0x1234ABCD;
+ constexpr std::optional<long> o = std::move(i);
+ static_assert( o, "" );
+ static_assert( *o == 0x1234ABCD, "" );
+ }
+
+ {
+ constexpr long i = 0x1234ABCD;
+ constexpr std::optional<long> o = { std::move(i) };
+ static_assert( o, "" );
+ static_assert( *o == 0x1234ABCD, "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+int main()
+{
+ // [20.5.5] In-place construction
+ static_assert( std::is_same<decltype(std::in_place), const std::in_place_t>(), "" );
+ static_assert( std::is_empty<std::in_place_t>(), "" );
+
+ {
+ constexpr std::optional<int> o { std::in_place };
+ static_assert( o, "" );
+ static_assert( *o == int {}, "" );
+
+ static_assert( !std::is_convertible<std::in_place_t, std::optional<int>>(), "" );
+ }
+
+ {
+ constexpr std::optional<int> o { std::in_place, 42 };
+ static_assert( o, "" );
+ static_assert( *o == 42, "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+int main()
+{
+ constexpr int i = 42;
+ constexpr auto o = std::make_optional(i);
+ static_assert( std::is_same<decltype(o), const std::optional<int>>(), "" );
+ static_assert( o && *o == 42, "" );
+ static_assert( &*o != &i, "" );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+int main()
+{
+ // [20.5.6] Disengaged state indicator
+ static_assert( std::is_same<decltype(std::nullopt), const std::nullopt_t>(), "" );
+ static_assert( std::is_empty<std::nullopt_t>(), "" );
+ static_assert( std::is_literal_type<std::nullopt_t>(), "" );
+ static_assert( !std::is_default_constructible<std::nullopt_t>(), "" );
+
+ {
+ constexpr std::optional<int> o = std::nullopt;
+ static_assert( !o, "" );
+ }
+
+ {
+ constexpr std::optional<int> o = { std::nullopt };
+ static_assert( !o, "" );
+ }
+
+ {
+ constexpr std::optional<int> o { std::nullopt };
+ static_assert( !o, "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+
+struct value_type
+{
+ int i;
+};
+
+int main()
+{
+ constexpr std::optional<value_type> o { value_type { 51 } };
+ static_assert( (*o).i == 51, "" );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+
+struct value_type
+{
+ int i;
+
+ void* operator&() { return nullptr; } // N.B. non-const
+};
+
+int main()
+{
+ constexpr std::optional<value_type> o { value_type { 51 } };
+ static_assert( o->i == 51, "" );
+ static_assert( o->i == (*o).i, "" );
+ static_assert( &o->i == &(*o).i, "" );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+
+struct value_type
+{
+ int i;
+};
+
+int main()
+{
+ constexpr std::optional<value_type> o { value_type { 51 } };
+ static_assert( o.value().i == 51, "" );
+ static_assert( o.value().i == (*o).i, "" );
+ static_assert( &o.value().i == &(*o).i, "" );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+
+struct value_type
+{
+ int i;
+};
+
+int main()
+{
+ constexpr std::optional<value_type> o { value_type { 51 } };
+ constexpr value_type fallback { 3 };
+ static_assert( o.value_or(fallback).i == 51, "" );
+ static_assert( o.value_or(fallback).i == (*o).i, "" );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+
+struct value_type
+{
+ int i;
+};
+
+int main()
+{
+ {
+ constexpr std::optional<value_type> o = std::nullopt;
+ static_assert( !o, "" );
+ }
+
+ {
+ constexpr std::optional<value_type> o { value_type { 51 } };
+ static_assert( o, "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ const char* s;
+ };
+
+ constexpr bool
+ strcmp(const char* lhs, const char* rhs)
+ {
+ return *lhs == *rhs && (!*lhs || strcmp(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ strrel(const char* lhs, const char* rhs)
+ {
+ return (*rhs && (!*lhs || (*lhs < *rhs)))
+ || ((*lhs && *rhs && !(*rhs < *lhs)) && strrel(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i == rhs.i) && strcmp(lhs.s, rhs.s); }
+
+ constexpr bool
+ operator!=(value_type const& lhs, value_type const& rhs)
+ { return !(lhs == rhs); }
+
+ constexpr bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i < rhs.i) || (!(rhs.i < lhs.i) && strrel(lhs.s, rhs.s)); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+
+ {
+ constexpr O o, p;
+ static_assert( o == p, "" );
+ static_assert( !(o != p), "" );
+ }
+
+ {
+ constexpr O o { value_type { 42, "forty-two" } }, p;
+ static_assert( !(o == p), "" );
+ static_assert( o != p, "" );
+ }
+
+ {
+ constexpr O o, p { value_type { 42, "forty-two" } };
+ static_assert( !(o == p), "" );
+ static_assert( o != p, "" );
+ }
+
+ {
+ constexpr O o { value_type { 11, "eleventy" } }, p { value_type { 42, "forty-two" } };
+ static_assert( !(o == p), "" );
+ static_assert( o != p, "" );
+ }
+
+ {
+ constexpr O o { value_type { 42, "forty-two" } }, p { value_type { 11, "eleventy" } };
+ static_assert( !(o == p), "" );
+ static_assert( o != p, "" );
+ }
+
+ {
+ constexpr O o { value_type { 42, "forty-two" } }, p { value_type { 42, "forty-two" } };
+ static_assert( o == p, "" );
+ static_assert( !(o != p), "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ const char* s;
+ };
+
+ constexpr bool
+ strcmp(const char* lhs, const char* rhs)
+ {
+ return *lhs == *rhs && (!*lhs || strcmp(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ strrel(const char* lhs, const char* rhs)
+ {
+ return (*rhs && (!*lhs || (*lhs < *rhs)))
+ || ((*lhs && *rhs && !(*rhs < *lhs)) && strrel(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i == rhs.i) && strcmp(lhs.s, rhs.s); }
+
+ constexpr bool
+ operator!=(value_type const& lhs, value_type const& rhs)
+ { return !(lhs == rhs); }
+
+ constexpr bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i < rhs.i) || (!(rhs.i < lhs.i) && strrel(lhs.s, rhs.s)); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+
+ {
+ constexpr O o, p;
+ static_assert( !(o < p), "" );
+ static_assert( !(o > p), "" );
+ static_assert( o <= p, "" );
+ static_assert( o >= p, "" );
+ }
+
+ {
+ constexpr O o { value_type { 42, "forty-two" } }, p;
+ static_assert( !(o < p), "" );
+ static_assert( o > p, "" );
+ static_assert( !(o <= p), "" );
+ static_assert( o >= p, "" );
+ }
+
+ {
+ constexpr O o, p { value_type { 42, "forty-two" } };
+ static_assert( o < p, "" );
+ static_assert( !(o > p), "" );
+ static_assert( o <= p, "" );
+ static_assert( !(o >= p), "" );
+ }
+
+ {
+ constexpr O o { value_type { 11, "eleventy" } }, p { value_type { 42, "forty-two" } };
+ static_assert( o < p, "" );
+ static_assert( !(o > p), "" );
+ static_assert( o <= p, "" );
+ static_assert( !(o >= p), "" );
+ }
+
+ {
+ constexpr O o { value_type { 42, "forty-two" } }, p { value_type { 11, "eleventy" } };
+ static_assert( !(o < p), "" );
+ static_assert( o > p, "" );
+ static_assert( !(o <= p), "" );
+ static_assert( o >= p, "" );
+ }
+
+ {
+ constexpr O o { value_type { 42, "forty-two" } }, p { value_type { 42, "forty-two" } };
+ static_assert( !(o < p), "" );
+ static_assert( !(o > p), "" );
+ static_assert( o <= p, "" );
+ static_assert( o >= p, "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ const char* s;
+ };
+
+ constexpr bool
+ strcmp(const char* lhs, const char* rhs)
+ {
+ return *lhs == *rhs && (!*lhs || strcmp(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ strrel(const char* lhs, const char* rhs)
+ {
+ return (*rhs && (!*lhs || (*lhs < *rhs)))
+ || ((*lhs && *rhs && !(*rhs < *lhs)) && strrel(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i == rhs.i) && strcmp(lhs.s, rhs.s); }
+
+ constexpr bool
+ operator!=(value_type const& lhs, value_type const& rhs)
+ { return !(lhs == rhs); }
+
+ constexpr bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i < rhs.i) || (!(rhs.i < lhs.i) && strrel(lhs.s, rhs.s)); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+
+ constexpr value_type reference { 42, "forty-two" };
+
+ {
+ constexpr O o;
+ static_assert( !(o == reference), "" );
+ static_assert( !(reference == o), "" );
+ static_assert( o != reference, "" );
+ static_assert( reference != o, "" );
+ }
+
+ {
+ constexpr O o { value_type { 11, "eleventy" } };
+ static_assert( !(o == reference), "" );
+ static_assert( !(reference == o), "" );
+ static_assert( o != reference, "" );
+ static_assert( reference != o, "" );
+ }
+
+ {
+ constexpr O o { value_type { 42, "forty-two" } };
+ static_assert( o == reference, "" );
+ static_assert( reference == o, "" );
+ static_assert( !(o != reference), "" );
+ static_assert( !(reference != o), "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ const char* s;
+ };
+
+ constexpr bool
+ strcmp(const char* lhs, const char* rhs)
+ {
+ return *lhs == *rhs && (!*lhs || strcmp(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ strrel(const char* lhs, const char* rhs)
+ {
+ return (*rhs && (!*lhs || (*lhs < *rhs)))
+ || ((*lhs && *rhs && !(*rhs < *lhs)) && strrel(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i == rhs.i) && strcmp(lhs.s, rhs.s); }
+
+ constexpr bool
+ operator!=(value_type const& lhs, value_type const& rhs)
+ { return !(lhs == rhs); }
+
+ constexpr bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i < rhs.i) || (!(rhs.i < lhs.i) && strrel(lhs.s, rhs.s)); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+
+ constexpr value_type reference { 42, "forty-two" };
+
+ {
+ constexpr O o;
+ static_assert( o < reference, "" );
+ static_assert( !(reference < o), "" );
+ static_assert( !(o > reference), "" );
+ static_assert( reference > o, "" );
+ static_assert( o <= reference, "" );
+ static_assert( !(reference <= o), "" );
+ static_assert( !(o >= reference), "" );
+ static_assert( reference >= o, "" );
+ }
+
+ {
+ constexpr O o { value_type { 11, "eleventy" } };
+ static_assert( o < reference, "" );
+ static_assert( !(reference < o), "" );
+ static_assert( !(o > reference), "" );
+ static_assert( reference > o, "" );
+ static_assert( o <= reference, "" );
+ static_assert( !(reference <= o), "" );
+ static_assert( !(o >= reference), "" );
+ static_assert( reference >= o, "" );
+ }
+
+ {
+ constexpr O o { value_type { 42, "forty-two" } };
+ static_assert( !(o < reference), "" );
+ static_assert( !(reference < o), "" );
+ static_assert( !(o > reference), "" );
+ static_assert( !(reference > o), "" );
+ static_assert( o <= reference, "" );
+ static_assert( reference <= o, "" );
+ static_assert( o >= reference, "" );
+ static_assert( reference >= o, "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ const char* s;
+ };
+
+ constexpr bool
+ strcmp(const char* lhs, const char* rhs)
+ {
+ return *lhs == *rhs && (!*lhs || strcmp(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ strrel(const char* lhs, const char* rhs)
+ {
+ return (*rhs && (!*lhs || (*lhs < *rhs)))
+ || ((*lhs && *rhs && !(*rhs < *lhs)) && strrel(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i == rhs.i) && strcmp(lhs.s, rhs.s); }
+
+ constexpr bool
+ operator!=(value_type const& lhs, value_type const& rhs)
+ { return !(lhs == rhs); }
+
+ constexpr bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i < rhs.i) || (!(rhs.i < lhs.i) && strrel(lhs.s, rhs.s)); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+ using std::nullopt;
+
+ {
+ constexpr O o;
+ static_assert( o == nullopt, "" );
+ static_assert( nullopt == o, "" );
+ static_assert( !(o != nullopt), "" );
+ static_assert( !(nullopt != o), "" );
+ }
+
+ {
+ constexpr O o { std::in_place };
+ static_assert( !(o == nullopt), "" );
+ static_assert( !(nullopt == o), "" );
+ static_assert( o != nullopt, "" );
+ static_assert( nullopt != o, "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ const char* s;
+ };
+
+ constexpr bool
+ strcmp(const char* lhs, const char* rhs)
+ {
+ return *lhs == *rhs && (!*lhs || strcmp(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ strrel(const char* lhs, const char* rhs)
+ {
+ return (*rhs && (!*lhs || (*lhs < *rhs)))
+ || ((*lhs && *rhs && !(*rhs < *lhs)) && strrel(lhs + 1, rhs + 1));
+ }
+
+ constexpr bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i == rhs.i) && strcmp(lhs.s, rhs.s); }
+
+ constexpr bool
+ operator!=(value_type const& lhs, value_type const& rhs)
+ { return !(lhs == rhs); }
+
+ constexpr bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return (lhs.i < rhs.i) || (!(rhs.i < lhs.i) && strrel(lhs.s, rhs.s)); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+ using std::nullopt;
+
+ {
+ constexpr O o;
+ static_assert( !(o < nullopt), "" );
+ static_assert( !(nullopt < o), "" );
+ static_assert( !(o > nullopt), "" );
+ static_assert( !(nullopt > o), "" );
+ static_assert( o <= nullopt, "" );
+ static_assert( nullopt <= o, "" );
+ static_assert( o >= nullopt, "" );
+ static_assert( nullopt >= o, "" );
+ }
+
+ {
+ constexpr O o { std::in_place };
+ static_assert( !(o < nullopt), "" );
+ static_assert( nullopt < o, "" );
+ static_assert( o > nullopt, "" );
+ static_assert( !(nullopt > o), "" );
+ static_assert( !(o <= nullopt), "" );
+ static_assert( nullopt <= o, "" );
+ static_assert( o >= nullopt, "" );
+ static_assert( !(nullopt >= o), "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <vector>
+
+int main()
+{
+ // [20.5.5] In-place construction
+ static_assert( std::is_same<decltype(std::in_place), const std::in_place_t>(), "" );
+ static_assert( std::is_empty<std::in_place_t>(), "" );
+
+ {
+ std::optional<int> o { std::in_place };
+ VERIFY( o );
+ VERIFY( *o == int() );
+
+ static_assert( !std::is_convertible<std::in_place_t, std::optional<int>>(), "" );
+ }
+
+ {
+ std::optional<int> o { std::in_place, 42 };
+ VERIFY( o );
+ VERIFY( *o == 42 );
+ }
+
+ {
+ std::optional<std::vector<int>> o { std::in_place, 18, 4 };
+ VERIFY( o );
+ VERIFY( o->size() == 18 );
+ VERIFY( (*o)[17] == 4 );
+ }
+
+ {
+ std::optional<std::vector<int>> o { std::in_place, { 18, 4 } };
+ VERIFY( o );
+ VERIFY( o->size() == 2 );
+ VERIFY( (*o)[0] == 18 );
+ }
+
+ {
+ std::optional<std::vector<int>> o { std::in_place, { 18, 4 }, std::allocator<int> {} };
+ VERIFY( o );
+ VERIFY( o->size() == 2 );
+ VERIFY( (*o)[0] == 18 );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+int main()
+{
+ const int i = 42;
+ auto o = std::make_optional(i);
+ static_assert( std::is_same<decltype(o), std::optional<int>>(), "" );
+ VERIFY( o && *o == 42 );
+ VERIFY( &*o != &i );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+int main()
+{
+ // [20.5.6] Disengaged state indicator
+ static_assert( std::is_same<decltype(std::nullopt), const std::nullopt_t>(), "" );
+ static_assert( std::is_empty<std::nullopt_t>(), "" );
+ static_assert( std::is_literal_type<std::nullopt_t>(), "" );
+ static_assert( !std::is_default_constructible<std::nullopt_t>(), "" );
+
+ {
+ std::optional<int> o = std::nullopt;
+ VERIFY( !o );
+ }
+
+ {
+ std::optional<int> o = { std::nullopt };
+ VERIFY( !o );
+ }
+
+ {
+ std::optional<int> o { std::nullopt };
+ VERIFY( !o );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct value_type
+{
+ int i;
+};
+
+int main()
+{
+ std::optional<value_type> o { value_type { 51 } };
+ VERIFY( (*o).i == 51 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct value_type
+{
+ int i;
+};
+
+void* operator&(const value_type&) = delete;
+
+int main()
+{
+ std::optional<value_type> o { value_type { 51 } };
+ VERIFY( o->i == 51 );
+ VERIFY( o->i == (*o).i );
+ VERIFY( &o->i == &(*o).i );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct value_type
+{
+ int i;
+};
+
+int main()
+{
+ {
+ std::optional<value_type> o { value_type { 51 } };
+ VERIFY( o.value().i == 51 );
+ VERIFY( o.value().i == (*o).i );
+ VERIFY( &o.value().i == &(*o).i );
+ }
+
+ {
+ enum outcome_type { nothrow, caught, bad_catch };
+
+ outcome_type outcome {};
+ std::optional<value_type> o = std::nullopt;
+ bool called = false;
+ auto const eat = [&called](int) { called = true; };
+
+ try
+ {
+ eat(o.value().i);
+ }
+ catch(std::bad_optional_access const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( outcome == caught );
+ VERIFY( !called );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct value_type
+{
+ int i;
+};
+
+int main()
+{
+ std::optional<value_type> o { value_type { 51 } };
+ value_type fallback { 3 };
+ VERIFY( o.value_or(fallback).i == 51 );
+ VERIFY( o.value_or(fallback).i == (*o).i );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct value_type
+{
+ int i;
+};
+
+int main()
+{
+ {
+ std::optional<value_type> o = std::nullopt;
+ VERIFY( !o );
+ }
+
+ {
+ std::optional<value_type> o { value_type { 51 } };
+ VERIFY( o );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <tuple>
+#include <string>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ std::string s;
+ };
+
+ bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) == std::tie(rhs.i, rhs.s); }
+
+ bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) < std::tie(rhs.i, rhs.s); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+
+ {
+ O o, p;
+ VERIFY( o == p );
+ VERIFY( !(o != p) );
+ }
+
+ {
+ O o { value_type { 42, "forty-two" } }, p;
+ VERIFY( !(o == p) );
+ VERIFY( o != p );
+ }
+
+ {
+ O o, p { value_type { 42, "forty-two" } };
+ VERIFY( !(o == p) );
+ VERIFY( o != p );
+ }
+
+ {
+ O o { value_type { 11, "eleventy" } }, p { value_type { 42, "forty-two" } };
+ VERIFY( !(o == p) );
+ VERIFY( o != p );
+ }
+
+ {
+ O o { value_type { 42, "forty-two" } }, p { value_type { 11, "eleventy" } };
+ VERIFY( !(o == p) );
+ VERIFY( o != p );
+ }
+
+ {
+ O o { value_type { 42, "forty-two" } }, p { value_type { 42, "forty-two" } };
+ VERIFY( o == p );
+ VERIFY( !(o != p) );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <tuple>
+#include <string>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ std::string s;
+ };
+
+ bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) == std::tie(rhs.i, rhs.s); }
+
+ bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) < std::tie(rhs.i, rhs.s); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+
+ {
+ O o, p;
+ VERIFY( !(o < p) );
+ VERIFY( !(o > p) );
+ VERIFY( o <= p );
+ VERIFY( o >= p );
+ }
+
+ {
+ O o { value_type { 42, "forty-two" } }, p;
+ VERIFY( !(o < p) );
+ VERIFY( o > p );
+ VERIFY( !(o <= p) );
+ VERIFY( o >= p );
+ }
+
+ {
+ O o, p { value_type { 42, "forty-two" } };
+ VERIFY( o < p );
+ VERIFY( !(o > p) );
+ VERIFY( o <= p );
+ VERIFY( !(o >= p) );
+ }
+
+ {
+ O o { value_type { 11, "eleventy" } }, p { value_type { 42, "forty-two" } };
+ VERIFY( o < p );
+ VERIFY( !(o > p) );
+ VERIFY( o <= p );
+ VERIFY( !(o >= p) );
+ }
+
+ {
+ O o { value_type { 42, "forty-two" } }, p { value_type { 11, "eleventy" } };
+ VERIFY( !(o < p) );
+ VERIFY( o > p );
+ VERIFY( !(o <= p) );
+ VERIFY( o >= p );
+ }
+
+ {
+ O o { value_type { 42, "forty-two" } }, p { value_type { 42, "forty-two" } };
+ VERIFY( !(o < p) );
+ VERIFY( !(o > p) );
+ VERIFY( o <= p );
+ VERIFY( o >= p );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <tuple>
+#include <string>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ std::string s;
+ };
+
+ bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) == std::tie(rhs.i, rhs.s); }
+
+ bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) < std::tie(rhs.i, rhs.s); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+
+ value_type const reference { 42, "forty-two" };
+
+ {
+ O o;
+ VERIFY( !(o == reference) );
+ VERIFY( !(reference == o) );
+ VERIFY( o != reference );
+ VERIFY( reference != o );
+ }
+
+ {
+ O o { value_type { 11, "eleventy" } };
+ VERIFY( !(o == reference) );
+ VERIFY( !(reference == o) );
+ VERIFY( o != reference );
+ VERIFY( reference != o );
+ }
+
+ {
+ O o { value_type { 42, "forty-two" } };
+ VERIFY( o == reference );
+ VERIFY( reference == o );
+ VERIFY( !(o != reference) );
+ VERIFY( !(reference != o) );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <tuple>
+#include <string>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ std::string s;
+ };
+
+ bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) == std::tie(rhs.i, rhs.s); }
+
+ bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) < std::tie(rhs.i, rhs.s); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+
+ value_type const reference { 42, "forty-two" };
+
+ {
+ O o;
+ VERIFY( o < reference );
+ VERIFY( !(reference < o) );
+ VERIFY( !(o > reference) );
+ VERIFY( reference > o );
+ VERIFY( o <= reference );
+ VERIFY( !(reference <= o) );
+ VERIFY( !(o >= reference) );
+ VERIFY( reference >= o );
+ }
+
+ {
+ O o { value_type { 11, "eleventy" } };
+ VERIFY( o < reference );
+ VERIFY( !(reference < o) );
+ VERIFY( !(o > reference) );
+ VERIFY( reference > o );
+ VERIFY( o <= reference );
+ VERIFY( !(reference <= o) );
+ VERIFY( !(o >= reference) );
+ VERIFY( reference >= o );
+ }
+
+ {
+ O o { value_type { 42, "forty-two" } };
+ VERIFY( !(o < reference) );
+ VERIFY( !(reference < o) );
+ VERIFY( !(o > reference) );
+ VERIFY( !(reference > o) );
+ VERIFY( o <= reference );
+ VERIFY( reference <= o );
+ VERIFY( o >= reference );
+ VERIFY( reference >= o );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <tuple>
+#include <string>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ std::string s;
+ };
+
+ bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) == std::tie(rhs.i, rhs.s); }
+
+ bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) < std::tie(rhs.i, rhs.s); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+ using std::nullopt;
+
+ {
+ O o;
+ VERIFY( o == nullopt );
+ VERIFY( nullopt == o );
+ VERIFY( !(o != nullopt) );
+ VERIFY( !(nullopt != o) );
+ }
+
+ {
+ O o { std::in_place };
+ VERIFY( !(o == nullopt) );
+ VERIFY( !(nullopt == o) );
+ VERIFY( o != nullopt );
+ VERIFY( nullopt != o );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <tuple>
+#include <string>
+
+namespace ns
+{
+ struct value_type
+ {
+ int i;
+ std::string s;
+ };
+
+ bool
+ operator==(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) == std::tie(rhs.i, rhs.s); }
+
+ bool
+ operator<(value_type const& lhs, value_type const& rhs)
+ { return std::tie(lhs.i, lhs.s) < std::tie(rhs.i, rhs.s); }
+
+} // namespace ns
+
+int main()
+{
+ using ns::value_type;
+ using O = std::optional<value_type>;
+ using std::nullopt;
+
+ {
+ O o;
+ VERIFY( !(o < nullopt) );
+ VERIFY( !(nullopt < o) );
+ VERIFY( !(o > nullopt) );
+ VERIFY( !(nullopt > o) );
+ VERIFY( o <= nullopt );
+ VERIFY( nullopt <= o );
+ VERIFY( o >= nullopt );
+ VERIFY( nullopt >= o );
+ }
+
+ {
+ O o { std::in_place };
+ VERIFY( !(o < nullopt) );
+ VERIFY( nullopt < o );
+ VERIFY( o > nullopt );
+ VERIFY( !(nullopt > o) );
+ VERIFY( !(o <= nullopt) );
+ VERIFY( nullopt <= o );
+ VERIFY( o >= nullopt );
+ VERIFY( !(nullopt >= o) );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+#include <tuple>
+
+using std::bad_optional_access;
+static_assert( std::is_default_constructible<bad_optional_access>::value, "" );
+
+struct trivially_destructible
+{
+ trivially_destructible() = delete;
+ trivially_destructible(trivially_destructible const&) = delete;
+ trivially_destructible& operator=(trivially_destructible const&) = delete;
+ trivially_destructible(trivially_destructible&&) = delete;
+ trivially_destructible& operator=(trivially_destructible&&) = delete;
+ ~trivially_destructible() noexcept = default;
+};
+
+static_assert( std::is_trivially_destructible<trivially_destructible>(), "" );
+
+struct no_default_constructor
+{
+ no_default_constructor() = delete;
+};
+
+struct no_copy_constructor
+{
+ no_copy_constructor() = default;
+ no_copy_constructor(no_copy_constructor const&) = delete;
+ no_copy_constructor& operator=(no_copy_constructor const&) = default;
+ no_copy_constructor(no_copy_constructor&&) = default;
+ no_copy_constructor& operator=(no_copy_constructor&&) = default;
+};
+
+struct no_copy_assignment
+{
+ no_copy_assignment() = default;
+ no_copy_assignment(no_copy_assignment const&) = default;
+ no_copy_assignment(no_copy_assignment&&) = default;
+ no_copy_assignment& operator=(no_copy_assignment&&) = default;
+};
+
+struct no_move_constructor
+{
+ no_move_constructor() = default;
+ no_move_constructor(no_move_constructor const&) = default;
+ no_move_constructor& operator=(no_move_constructor const&) = default;
+ no_move_constructor(no_move_constructor&&) = delete;
+ no_move_constructor& operator=(no_move_constructor&&) = default;
+};
+
+struct no_move_assignment
+{
+ no_move_assignment() = default;
+ no_move_assignment(no_move_assignment const&) = default;
+ no_move_assignment& operator=(no_move_assignment const&) = default;
+ no_move_assignment(no_move_assignment&&) = default;
+ no_move_assignment& operator=(no_move_assignment&&) = delete;
+};
+
+struct no_copy : no_copy_constructor, no_copy_assignment { };
+struct no_move : no_move_constructor, no_move_assignment { };
+
+// Laxest possible model of a value type for optional
+struct only_destructible
+{
+ only_destructible(only_destructible&&) = delete;
+};
+
+int main()
+{
+ {
+ static_assert( std::is_trivially_destructible<std::optional<trivially_destructible>>(), "" );
+ }
+
+ {
+ using T = no_default_constructor;
+ using O = std::optional<T>;
+ static_assert( std::is_same<O::value_type, T>(), "" );
+ static_assert( std::is_default_constructible<O>(), "" );
+ { O o; }
+ static_assert( std::is_copy_constructible<O>(), "" );
+ { O o; auto copy = o; }
+ static_assert( std::is_copy_assignable<O>(), "" );
+ { O o, p; p = o; }
+ static_assert( std::is_move_constructible<O>(), "" );
+ { O o; auto moved_to = std::move(o); }
+ static_assert( std::is_move_assignable<O>(), "" );
+ { O o, p; p = std::move(o); }
+ }
+
+ {
+ using T = no_copy_constructor;
+ using O = std::optional<T>;
+ static_assert( std::is_same<O::value_type, T>(), "" );
+ static_assert( std::is_default_constructible<O>(), "" );
+ { O o; }
+ static_assert( !std::is_copy_constructible<O>(), "" );
+ static_assert( !std::is_copy_assignable<O>(), "" );
+ static_assert( std::is_move_constructible<O>(), "" );
+ { O o; auto moved_to = std::move(o); }
+ static_assert( std::is_move_assignable<O>(), "" );
+ { O o, p; p = std::move(o); }
+ }
+
+ {
+ using T = no_copy_assignment;
+ using O = std::optional<T>;
+ static_assert( std::is_default_constructible<O>(), "" );
+ { O o; }
+ static_assert( std::is_copy_constructible<O>(), "" );
+ { O o; auto copy = o; }
+ static_assert( !std::is_copy_assignable<O>(), "" );
+ static_assert( std::is_move_constructible<O>(), "" );
+ { O o; auto moved_to = std::move(o); }
+ static_assert( std::is_move_assignable<O>(), "" );
+ { O o, p; p = std::move(o); }
+ }
+
+ {
+ using T = no_copy;
+ using O = std::optional<T>;
+ static_assert( std::is_same<O::value_type, T>(), "" );
+ static_assert( std::is_default_constructible<O>(), "" );
+ { O o; }
+ static_assert( !std::is_copy_constructible<O>(), "" );
+ static_assert( !std::is_copy_assignable<O>(), "" );
+ static_assert( std::is_move_constructible<O>(), "" );
+ { O o; auto moved_to = std::move(o); }
+ static_assert( std::is_move_assignable<O>(), "" );
+ { O o, p; p = std::move(o); }
+ }
+
+ {
+ using T = no_move_constructor;
+ using O = std::optional<T>;
+ static_assert( std::is_same<O::value_type, T>(), "" );
+ static_assert( std::is_default_constructible<O>(), "" );
+ { O o; }
+ static_assert( std::is_copy_constructible<O>(), "" );
+ { O o; auto copy = o; }
+ static_assert( std::is_copy_assignable<O>(), "" );
+ /*
+ * T should be move constructible due to [12.8/11], which is a new rule in C++1y
+ * not yet implemented by GCC. Because there is already a special exception in C++11
+ * for the generation of the special members that GCC implements (at least some of the
+ * time), this does not affect the std::optional implementation however. So the assertion
+ * for T should be changed (or removed altogether) when the time comes, but the rest
+ * should however remain correct and unchanged.
+ */
+ static_assert( !std::is_move_constructible<T>(), "" );
+ static_assert( std::is_move_constructible<O>(), "" );
+ { O o; auto moved_to = std::move(o); }
+ static_assert( std::is_move_assignable<O>(), "" );
+ { O o, p; p = std::move(o); }
+ }
+
+ {
+ using T = no_move_assignment;
+ using O = std::optional<T>;
+ static_assert( std::is_same<O::value_type, T>(), "" );
+ static_assert( std::is_default_constructible<O>(), "" );
+ { O o; }
+ static_assert( std::is_copy_constructible<O>(), "" );
+ { O o; auto copy = o; }
+ static_assert( std::is_copy_assignable<O>(), "" );
+ { O o, p; p = o; }
+ static_assert( std::is_move_constructible<O>(), "" );
+ { O o; auto moved_to = std::move(o); }
+ /*
+ * Paragraph 23 of same leads to a similar situation but with respect to move
+ * assignment.
+ */
+ static_assert( !std::is_move_assignable<T>(), "" );
+ static_assert( std::is_move_assignable<O>(), "" );
+ { O o, p; p = std::move(o); }
+ }
+
+ {
+ using T = no_move;
+ using O = std::optional<T>;
+ static_assert( std::is_same<O::value_type, T>(), "" );
+ static_assert( std::is_default_constructible<O>(), "" );
+ { O o; }
+ static_assert( std::is_copy_constructible<O>(), "" );
+ { O o; auto copy = o; }
+ static_assert( std::is_copy_assignable<O>(), "" );
+ { O o, p; p = o; }
+ static_assert( std::is_move_constructible<O>(), "" );
+ { O o; auto moved_to = std::move(o); }
+ static_assert( std::is_move_assignable<O>(), "" );
+ { O o, p; p = std::move(o); }
+ }
+
+ {
+ using T = only_destructible;
+ using O = std::optional<T>;
+ static_assert( std::is_same<O::value_type, T>(), "" );
+ static_assert( std::is_default_constructible<O>(), "" );
+ { O o; }
+ static_assert( !std::is_copy_constructible<O>(), "" );
+ static_assert( !std::is_copy_assignable<O>(), "" );
+ static_assert( !std::is_move_constructible<O>(), "" );
+ static_assert( !std::is_move_assignable<O>(), "" );
+ }
+
+ {
+ /*
+ * Should not complain about 'invalid' specializations as long as
+ * they're not instantiated.
+ */
+ using A = std::optional<int&>;
+ using B = std::optional<int&&>;
+ using C1 = std::optional<std::in_place_t>;
+ using C2 = std::optional<std::in_place_t const>;
+ using C3 = std::optional<std::in_place_t volatile>;
+ using C4 = std::optional<std::in_place_t const volatile>;
+ using D1 = std::optional<std::nullopt_t>;
+ using D2 = std::optional<std::nullopt_t const>;
+ using D3 = std::optional<std::nullopt_t volatile>;
+ using D4 = std::optional<std::nullopt_t const volatile>;
+
+ using X = std::tuple<A, B, C1, C2, C3, C4, D1, D2, D3, D4>;
+ }
+
+ {
+ std::optional<const int> o { 42 };
+ static_assert( std::is_same<decltype(o)::value_type, const int>(), "" );
+ VERIFY( o );
+ VERIFY( *o == 42 );
+ }
+
+ {
+ constexpr std::optional<const int> o { 33 };
+ static_assert( std::is_same<decltype(o)::value_type, const int>(), "" );
+ static_assert( o, "" );
+ static_assert( *o == 33, "" );
+ }
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2013-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct exception {};
+
+int counter = 0;
+
+struct mixin_counter
+{
+ mixin_counter() { ++counter; }
+ mixin_counter(mixin_counter const&) { ++counter; }
+ ~mixin_counter() { --counter; }
+};
+
+namespace ns
+{
+
+struct value_type : private mixin_counter
+{
+ explicit value_type(int state) : state(state) { }
+ int state;
+};
+
+int swaps = 0;
+
+void
+swap(value_type& lhs, value_type& rhs)
+{
+ ++swaps;
+ using std::swap;
+ swap(lhs.state, rhs.state);
+}
+
+} // namespace ns
+
+int main()
+{
+ using O = std::optional<ns::value_type>;
+
+ VERIFY( ns::swaps == 0 );
+
+ {
+ O o, p;
+ swap(o, p);
+ VERIFY( !o );
+ VERIFY( !p );
+ }
+
+ {
+ O o { std::in_place, 45 }, p;
+ swap(o, p);
+ VERIFY( !o );
+ VERIFY( p && p->state == 45 );
+ }
+
+ {
+ O o, p { std::in_place, 45 };
+ swap(o, p);
+ VERIFY( o && o->state == 45 );
+ VERIFY( !p );
+ }
+
+ {
+ O o { std::in_place, 167 }, p { std::in_place, 999 };
+ VERIFY( ns::swaps == 0 );
+
+ swap(o, p);
+
+ VERIFY( o && o->state == 999 );
+ VERIFY( p && p->state == 167 );
+ VERIFY( ns::swaps == 1 );
+ }
+
+ VERIFY( counter == 0 );
+}
--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2014-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <type_traits>
+#include <stdexcept>
+
+template<typename T>
+ using check1_t = std::optional<T>;
+
+using check2_t = std::in_place_t;
+using check3_t = std::nullopt_t;
+using check4_t = std::bad_optional_access;
+
+static_assert(std::is_base_of<std::logic_error, check4_t>::value,
+ "bad_optional_access must derive from logic_error");
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