// shared_ptr and weak_ptr implementation details -*- C++ -*-
-// Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright (C) 2007-2014 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
/** @file bits/shared_ptr_base.h
* This is an internal header file, included by other library headers.
- * You should not attempt to use it directly.
+ * Do not attempt to use it directly. @headername{memory}
*/
#ifndef _SHARED_PTR_BASE_H
#define _SHARED_PTR_BASE_H 1
-_GLIBCXX_BEGIN_NAMESPACE(std)
+#include <bits/allocated_ptr.h>
+#include <ext/aligned_buffer.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+#if _GLIBCXX_USE_DEPRECATED
+ template<typename> class auto_ptr;
+#endif
+
+ /**
+ * @brief Exception possibly thrown by @c shared_ptr.
+ * @ingroup exceptions
+ */
+ class bad_weak_ptr : public std::exception
+ {
+ public:
+ virtual char const*
+ what() const noexcept;
+
+ virtual ~bad_weak_ptr() noexcept;
+ };
+
+ // Substitute for bad_weak_ptr object in the case of -fno-exceptions.
+ inline void
+ __throw_bad_weak_ptr()
+ { _GLIBCXX_THROW_OR_ABORT(bad_weak_ptr()); }
+
+ using __gnu_cxx::_Lock_policy;
+ using __gnu_cxx::__default_lock_policy;
+ using __gnu_cxx::_S_single;
+ using __gnu_cxx::_S_mutex;
+ using __gnu_cxx::_S_atomic;
+
+ // Empty helper class except when the template argument is _S_mutex.
+ template<_Lock_policy _Lp>
+ class _Mutex_base
+ {
+ protected:
+ // The atomic policy uses fully-fenced builtins, single doesn't care.
+ enum { _S_need_barriers = 0 };
+ };
+
+ template<>
+ class _Mutex_base<_S_mutex>
+ : public __gnu_cxx::__mutex
+ {
+ protected:
+ // This policy is used when atomic builtins are not available.
+ // The replacement atomic operations might not have the necessary
+ // memory barriers.
+ enum { _S_need_barriers = 1 };
+ };
+
+ template<_Lock_policy _Lp = __default_lock_policy>
+ class _Sp_counted_base
+ : public _Mutex_base<_Lp>
+ {
+ public:
+ _Sp_counted_base() noexcept
+ : _M_use_count(1), _M_weak_count(1) { }
+
+ virtual
+ ~_Sp_counted_base() noexcept
+ { }
+
+ // Called when _M_use_count drops to zero, to release the resources
+ // managed by *this.
+ virtual void
+ _M_dispose() noexcept = 0;
+
+ // Called when _M_weak_count drops to zero.
+ virtual void
+ _M_destroy() noexcept
+ { delete this; }
+
+ virtual void*
+ _M_get_deleter(const std::type_info&) noexcept = 0;
+
+ void
+ _M_add_ref_copy()
+ { __gnu_cxx::__atomic_add_dispatch(&_M_use_count, 1); }
+
+ void
+ _M_add_ref_lock();
+
+ bool
+ _M_add_ref_lock_nothrow();
+
+ void
+ _M_release() noexcept
+ {
+ // Be race-detector-friendly. For more info see bits/c++config.
+ _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_use_count);
+ if (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, -1) == 1)
+ {
+ _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_use_count);
+ _M_dispose();
+ // There must be a memory barrier between dispose() and destroy()
+ // to ensure that the effects of dispose() are observed in the
+ // thread that runs destroy().
+ // See http://gcc.gnu.org/ml/libstdc++/2005-11/msg00136.html
+ if (_Mutex_base<_Lp>::_S_need_barriers)
+ {
+ _GLIBCXX_READ_MEM_BARRIER;
+ _GLIBCXX_WRITE_MEM_BARRIER;
+ }
+
+ // Be race-detector-friendly. For more info see bits/c++config.
+ _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_weak_count);
+ if (__gnu_cxx::__exchange_and_add_dispatch(&_M_weak_count,
+ -1) == 1)
+ {
+ _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_weak_count);
+ _M_destroy();
+ }
+ }
+ }
+
+ void
+ _M_weak_add_ref() noexcept
+ { __gnu_cxx::__atomic_add_dispatch(&_M_weak_count, 1); }
+
+ void
+ _M_weak_release() noexcept
+ {
+ // Be race-detector-friendly. For more info see bits/c++config.
+ _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_weak_count);
+ if (__gnu_cxx::__exchange_and_add_dispatch(&_M_weak_count, -1) == 1)
+ {
+ _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_weak_count);
+ if (_Mutex_base<_Lp>::_S_need_barriers)
+ {
+ // See _M_release(),
+ // destroy() must observe results of dispose()
+ _GLIBCXX_READ_MEM_BARRIER;
+ _GLIBCXX_WRITE_MEM_BARRIER;
+ }
+ _M_destroy();
+ }
+ }
+
+ long
+ _M_get_use_count() const noexcept
+ {
+ // No memory barrier is used here so there is no synchronization
+ // with other threads.
+ return __atomic_load_n(&_M_use_count, __ATOMIC_RELAXED);
+ }
+
+ private:
+ _Sp_counted_base(_Sp_counted_base const&) = delete;
+ _Sp_counted_base& operator=(_Sp_counted_base const&) = delete;
+
+ _Atomic_word _M_use_count; // #shared
+ _Atomic_word _M_weak_count; // #weak + (#shared != 0)
+ };
+
+ template<>
+ inline void
+ _Sp_counted_base<_S_single>::
+ _M_add_ref_lock()
+ {
+ if (_M_use_count == 0)
+ __throw_bad_weak_ptr();
+ ++_M_use_count;
+ }
+
+ template<>
+ inline void
+ _Sp_counted_base<_S_mutex>::
+ _M_add_ref_lock()
+ {
+ __gnu_cxx::__scoped_lock sentry(*this);
+ if (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, 1) == 0)
+ {
+ _M_use_count = 0;
+ __throw_bad_weak_ptr();
+ }
+ }
+
+ template<>
+ inline void
+ _Sp_counted_base<_S_atomic>::
+ _M_add_ref_lock()
+ {
+ // Perform lock-free add-if-not-zero operation.
+ _Atomic_word __count = _M_get_use_count();
+ do
+ {
+ if (__count == 0)
+ __throw_bad_weak_ptr();
+ // Replace the current counter value with the old value + 1, as
+ // long as it's not changed meanwhile.
+ }
+ while (!__atomic_compare_exchange_n(&_M_use_count, &__count, __count + 1,
+ true, __ATOMIC_ACQ_REL,
+ __ATOMIC_RELAXED));
+ }
+
+ template<>
+ inline bool
+ _Sp_counted_base<_S_single>::
+ _M_add_ref_lock_nothrow()
+ {
+ if (_M_use_count == 0)
+ return false;
+ ++_M_use_count;
+ return true;
+ }
+
+ template<>
+ inline bool
+ _Sp_counted_base<_S_mutex>::
+ _M_add_ref_lock_nothrow()
+ {
+ __gnu_cxx::__scoped_lock sentry(*this);
+ if (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, 1) == 0)
+ {
+ _M_use_count = 0;
+ return false;
+ }
+ return true;
+ }
+
+ template<>
+ inline bool
+ _Sp_counted_base<_S_atomic>::
+ _M_add_ref_lock_nothrow()
+ {
+ // Perform lock-free add-if-not-zero operation.
+ _Atomic_word __count = _M_get_use_count();
+ do
+ {
+ if (__count == 0)
+ return false;
+ // Replace the current counter value with the old value + 1, as
+ // long as it's not changed meanwhile.
+ }
+ while (!__atomic_compare_exchange_n(&_M_use_count, &__count, __count + 1,
+ true, __ATOMIC_ACQ_REL,
+ __ATOMIC_RELAXED));
+ return true;
+ }
+
+ template<>
+ inline void
+ _Sp_counted_base<_S_single>::_M_add_ref_copy()
+ { ++_M_use_count; }
+
+ template<>
+ inline void
+ _Sp_counted_base<_S_single>::_M_release() noexcept
+ {
+ if (--_M_use_count == 0)
+ {
+ _M_dispose();
+ if (--_M_weak_count == 0)
+ _M_destroy();
+ }
+ }
+
+ template<>
+ inline void
+ _Sp_counted_base<_S_single>::_M_weak_add_ref() noexcept
+ { ++_M_weak_count; }
+
+ template<>
+ inline void
+ _Sp_counted_base<_S_single>::_M_weak_release() noexcept
+ {
+ if (--_M_weak_count == 0)
+ _M_destroy();
+ }
+
+ template<>
+ inline long
+ _Sp_counted_base<_S_single>::_M_get_use_count() const noexcept
+ { return _M_use_count; }
+
// Forward declarations.
template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
// Counted ptr with no deleter or allocator support
template<typename _Ptr, _Lock_policy _Lp>
- class _Sp_counted_ptr : public _Sp_counted_base<_Lp>
+ class _Sp_counted_ptr final : public _Sp_counted_base<_Lp>
{
public:
explicit
- _Sp_counted_ptr(_Ptr __p)
+ _Sp_counted_ptr(_Ptr __p) noexcept
: _M_ptr(__p) { }
virtual void
- _M_dispose() // nothrow
+ _M_dispose() noexcept
{ delete _M_ptr; }
virtual void
- _M_destroy() // nothrow
+ _M_destroy() noexcept
{ delete this; }
virtual void*
- _M_get_deleter(const std::type_info&)
- { return 0; }
+ _M_get_deleter(const std::type_info&) noexcept
+ { return nullptr; }
_Sp_counted_ptr(const _Sp_counted_ptr&) = delete;
_Sp_counted_ptr& operator=(const _Sp_counted_ptr&) = delete;
- protected:
- _Ptr _M_ptr; // copy constructor must not throw
+ private:
+ _Ptr _M_ptr;
};
template<>
inline void
- _Sp_counted_ptr<nullptr_t, _S_single>::_M_dispose() { }
+ _Sp_counted_ptr<nullptr_t, _S_single>::_M_dispose() noexcept { }
template<>
inline void
- _Sp_counted_ptr<nullptr_t, _S_mutex>::_M_dispose() { }
+ _Sp_counted_ptr<nullptr_t, _S_mutex>::_M_dispose() noexcept { }
template<>
inline void
- _Sp_counted_ptr<nullptr_t, _S_atomic>::_M_dispose() { }
+ _Sp_counted_ptr<nullptr_t, _S_atomic>::_M_dispose() noexcept { }
+
+ template<int _Nm, typename _Tp,
+ bool __use_ebo = !__is_final(_Tp) && __is_empty(_Tp)>
+ struct _Sp_ebo_helper;
+
+ /// Specialization using EBO.
+ template<int _Nm, typename _Tp>
+ struct _Sp_ebo_helper<_Nm, _Tp, true> : private _Tp
+ {
+ explicit _Sp_ebo_helper(const _Tp& __tp) : _Tp(__tp) { }
+
+ static _Tp&
+ _S_get(_Sp_ebo_helper& __eboh) { return static_cast<_Tp&>(__eboh); }
+ };
+
+ /// Specialization not using EBO.
+ template<int _Nm, typename _Tp>
+ struct _Sp_ebo_helper<_Nm, _Tp, false>
+ {
+ explicit _Sp_ebo_helper(const _Tp& __tp) : _M_tp(__tp) { }
+
+ static _Tp&
+ _S_get(_Sp_ebo_helper& __eboh)
+ { return __eboh._M_tp; }
+
+ private:
+ _Tp _M_tp;
+ };
// Support for custom deleter and/or allocator
template<typename _Ptr, typename _Deleter, typename _Alloc, _Lock_policy _Lp>
- class _Sp_counted_deleter : public _Sp_counted_ptr<_Ptr, _Lp>
+ class _Sp_counted_deleter final : public _Sp_counted_base<_Lp>
{
- typedef typename _Alloc::template
- rebind<_Sp_counted_deleter>::other _My_alloc_type;
-
- // Helper class that stores the Deleter and also acts as an allocator.
- // Used to dispose of the owned pointer and the internal refcount
- // Requires that copies of _Alloc can free each other's memory.
- struct _My_Deleter
- : public _My_alloc_type // copy constructor must not throw
+ class _Impl : _Sp_ebo_helper<0, _Deleter>, _Sp_ebo_helper<1, _Alloc>
{
- _Deleter _M_del; // copy constructor must not throw
- _My_Deleter(_Deleter __d, const _Alloc& __a)
- : _My_alloc_type(__a), _M_del(__d) { }
- };
+ typedef _Sp_ebo_helper<0, _Deleter> _Del_base;
+ typedef _Sp_ebo_helper<1, _Alloc> _Alloc_base;
- protected:
- typedef _Sp_counted_ptr<_Ptr, _Lp> _Base_type;
+ public:
+ _Impl(_Ptr __p, _Deleter __d, const _Alloc& __a) noexcept
+ : _M_ptr(__p), _Del_base(__d), _Alloc_base(__a)
+ { }
+
+ _Deleter& _M_del() noexcept { return _Del_base::_S_get(*this); }
+ _Alloc& _M_alloc() noexcept { return _Alloc_base::_S_get(*this); }
+
+ _Ptr _M_ptr;
+ };
public:
+ using __allocator_type = __alloc_rebind<_Alloc, _Sp_counted_deleter>;
+
// __d(__p) must not throw.
- _Sp_counted_deleter(_Ptr __p, _Deleter __d)
- : _Base_type(__p), _M_del(__d, _Alloc()) { }
+ _Sp_counted_deleter(_Ptr __p, _Deleter __d) noexcept
+ : _M_impl(__p, __d, _Alloc()) { }
// __d(__p) must not throw.
- _Sp_counted_deleter(_Ptr __p, _Deleter __d, const _Alloc& __a)
- : _Base_type(__p), _M_del(__d, __a) { }
+ _Sp_counted_deleter(_Ptr __p, _Deleter __d, const _Alloc& __a) noexcept
+ : _M_impl(__p, __d, __a) { }
+
+ ~_Sp_counted_deleter() noexcept { }
virtual void
- _M_dispose() // nothrow
- { _M_del._M_del(_Base_type::_M_ptr); }
+ _M_dispose() noexcept
+ { _M_impl._M_del()(_M_impl._M_ptr); }
virtual void
- _M_destroy() // nothrow
+ _M_destroy() noexcept
{
- _My_alloc_type __a(_M_del);
+ __allocator_type __a(_M_impl._M_alloc());
+ __allocated_ptr<__allocator_type> __guard_ptr{ __a, this };
this->~_Sp_counted_deleter();
- __a.deallocate(this, 1);
}
virtual void*
- _M_get_deleter(const std::type_info& __ti)
+ _M_get_deleter(const std::type_info& __ti) noexcept
{
#ifdef __GXX_RTTI
- return __ti == typeid(_Deleter) ? &_M_del._M_del : 0;
+ return __ti == typeid(_Deleter) ? &_M_impl._M_del() : nullptr;
#else
- return 0;
+ return nullptr;
#endif
}
- protected:
- _My_Deleter _M_del; // copy constructor must not throw
+ private:
+ _Impl _M_impl;
};
// helpers for make_shared / allocate_shared
- template<typename _Tp>
- struct _Sp_destroy_inplace
- {
- void operator()(_Tp* __p) const { if (__p) __p->~_Tp(); }
- };
-
struct _Sp_make_shared_tag { };
template<typename _Tp, typename _Alloc, _Lock_policy _Lp>
- class _Sp_counted_ptr_inplace
- : public _Sp_counted_deleter<_Tp*, _Sp_destroy_inplace<_Tp>, _Alloc, _Lp>
+ class _Sp_counted_ptr_inplace final : public _Sp_counted_base<_Lp>
{
- typedef _Sp_counted_deleter<_Tp*, _Sp_destroy_inplace<_Tp>, _Alloc, _Lp>
- _Base_type;
+ class _Impl : _Sp_ebo_helper<0, _Alloc>
+ {
+ typedef _Sp_ebo_helper<0, _Alloc> _A_base;
+
+ public:
+ explicit _Impl(_Alloc __a) noexcept : _A_base(__a) { }
+
+ _Alloc& _M_alloc() noexcept { return _A_base::_S_get(*this); }
+
+ __gnu_cxx::__aligned_buffer<_Tp> _M_storage;
+ };
public:
- explicit
- _Sp_counted_ptr_inplace(_Alloc __a)
- : _Base_type(static_cast<_Tp*>(0), _Sp_destroy_inplace<_Tp>(), __a)
- , _M_storage()
- {
- void* __p = &_M_storage;
- ::new (__p) _Tp(); // might throw
- _Base_type::_Base_type::_M_ptr = static_cast<_Tp*>(__p);
- }
+ using __allocator_type = __alloc_rebind<_Alloc, _Sp_counted_ptr_inplace>;
template<typename... _Args>
_Sp_counted_ptr_inplace(_Alloc __a, _Args&&... __args)
- : _Base_type(static_cast<_Tp*>(0), _Sp_destroy_inplace<_Tp>(), __a)
- , _M_storage()
+ : _M_impl(__a)
{
- void* __p = &_M_storage;
- ::new (__p) _Tp(std::forward<_Args>(__args)...); // might throw
- _Base_type::_Base_type::_M_ptr = static_cast<_Tp*>(__p);
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2070. allocate_shared should use allocator_traits<A>::construct
+ allocator_traits<_Alloc>::construct(__a, _M_ptr(),
+ std::forward<_Args>(__args)...); // might throw
}
+ ~_Sp_counted_ptr_inplace() noexcept { }
+
+ virtual void
+ _M_dispose() noexcept
+ {
+ allocator_traits<_Alloc>::destroy(_M_impl._M_alloc(), _M_ptr());
+ }
+
// Override because the allocator needs to know the dynamic type
virtual void
- _M_destroy() // nothrow
+ _M_destroy() noexcept
{
- typedef typename _Alloc::template
- rebind<_Sp_counted_ptr_inplace>::other _My_alloc_type;
- _My_alloc_type __a(_Base_type::_M_del);
+ __allocator_type __a(_M_impl._M_alloc());
+ __allocated_ptr<__allocator_type> __guard_ptr{ __a, this };
this->~_Sp_counted_ptr_inplace();
- __a.deallocate(this, 1);
}
// Sneaky trick so __shared_ptr can get the managed pointer
virtual void*
- _M_get_deleter(const std::type_info& __ti)
+ _M_get_deleter(const std::type_info& __ti) noexcept
{
#ifdef __GXX_RTTI
- return __ti == typeid(_Sp_make_shared_tag)
- ? static_cast<void*>(&_M_storage)
- : _Base_type::_M_get_deleter(__ti);
-#else
- return 0;
+ if (__ti == typeid(_Sp_make_shared_tag))
+ return const_cast<typename remove_cv<_Tp>::type*>(_M_ptr());
#endif
+ return nullptr;
}
private:
- typename aligned_storage<sizeof(_Tp), alignment_of<_Tp>::value>::type
- _M_storage;
+ _Tp* _M_ptr() noexcept { return _M_impl._M_storage._M_ptr(); }
+
+ _Impl _M_impl;
};
+
template<_Lock_policy _Lp>
class __shared_count
{
public:
- __shared_count() : _M_pi(0) // nothrow
+ constexpr __shared_count() noexcept : _M_pi(0)
{ }
template<typename _Ptr>
}
template<typename _Ptr, typename _Deleter>
- __shared_count(_Ptr __p, _Deleter __d) : _M_pi(0)
- {
- // The allocator's value_type doesn't matter, will rebind it anyway.
- typedef std::allocator<int> _Alloc;
- typedef _Sp_counted_deleter<_Ptr, _Deleter, _Alloc, _Lp> _Sp_cd_type;
- typedef std::allocator<_Sp_cd_type> _Alloc2;
- _Alloc2 __a2;
- __try
- {
- _M_pi = __a2.allocate(1);
- ::new(static_cast<void*>(_M_pi)) _Sp_cd_type(__p, __d);
- }
- __catch(...)
- {
- __d(__p); // Call _Deleter on __p.
- if (_M_pi)
- __a2.deallocate(static_cast<_Sp_cd_type*>(_M_pi), 1);
- __throw_exception_again;
- }
- }
+ __shared_count(_Ptr __p, _Deleter __d)
+ : __shared_count(__p, std::move(__d), allocator<void>())
+ { }
template<typename _Ptr, typename _Deleter, typename _Alloc>
__shared_count(_Ptr __p, _Deleter __d, _Alloc __a) : _M_pi(0)
{
typedef _Sp_counted_deleter<_Ptr, _Deleter, _Alloc, _Lp> _Sp_cd_type;
- typedef typename _Alloc::template rebind<_Sp_cd_type>::other _Alloc2;
- _Alloc2 __a2(__a);
__try
{
- _M_pi = __a2.allocate(1);
- ::new(static_cast<void*>(_M_pi)) _Sp_cd_type(__p, __d, __a);
+ typename _Sp_cd_type::__allocator_type __a2(__a);
+ auto __guard = std::__allocate_guarded(__a2);
+ _Sp_cd_type* __mem = __guard.get();
+ ::new (__mem) _Sp_cd_type(__p, std::move(__d), std::move(__a));
+ _M_pi = __mem;
+ __guard = nullptr;
}
__catch(...)
{
__d(__p); // Call _Deleter on __p.
- if (_M_pi)
- __a2.deallocate(static_cast<_Sp_cd_type*>(_M_pi), 1);
__throw_exception_again;
}
}
template<typename _Tp, typename _Alloc, typename... _Args>
- __shared_count(_Sp_make_shared_tag, _Tp*, _Alloc __a, _Args&&... __args)
+ __shared_count(_Sp_make_shared_tag, _Tp*, const _Alloc& __a,
+ _Args&&... __args)
: _M_pi(0)
{
typedef _Sp_counted_ptr_inplace<_Tp, _Alloc, _Lp> _Sp_cp_type;
- typedef typename _Alloc::template rebind<_Sp_cp_type>::other _Alloc2;
- _Alloc2 __a2(__a);
- __try
- {
- _M_pi = __a2.allocate(1);
- ::new(static_cast<void*>(_M_pi)) _Sp_cp_type(__a,
- std::forward<_Args>(__args)...);
- }
- __catch(...)
- {
- if (_M_pi)
- __a2.deallocate(static_cast<_Sp_cp_type*>(_M_pi), 1);
- __throw_exception_again;
- }
+ typename _Sp_cp_type::__allocator_type __a2(__a);
+ auto __guard = std::__allocate_guarded(__a2);
+ _Sp_cp_type* __mem = __guard.get();
+ ::new (__mem) _Sp_cp_type(std::move(__a),
+ std::forward<_Args>(__args)...);
+ _M_pi = __mem;
+ __guard = nullptr;
}
-#if _GLIBCXX_DEPRECATED
+#if _GLIBCXX_USE_DEPRECATED
// Special case for auto_ptr<_Tp> to provide the strong guarantee.
template<typename _Tp>
explicit
- __shared_count(std::auto_ptr<_Tp>&& __r)
- : _M_pi(new _Sp_counted_ptr<_Tp*, _Lp>(__r.get()))
- { __r.release(); }
+ __shared_count(std::auto_ptr<_Tp>&& __r);
#endif
// Special case for unique_ptr<_Tp,_Del> to provide the strong guarantee.
template<typename _Tp, typename _Del>
explicit
- __shared_count(std::unique_ptr<_Tp, _Del>&& __r)
- : _M_pi(_S_create_from_up(std::move(__r)))
- { __r.release(); }
+ __shared_count(std::unique_ptr<_Tp, _Del>&& __r) : _M_pi(0)
+ {
+ using _Ptr = typename unique_ptr<_Tp, _Del>::pointer;
+ using _Del2 = typename conditional<is_reference<_Del>::value,
+ reference_wrapper<typename remove_reference<_Del>::type>,
+ _Del>::type;
+ using _Sp_cd_type
+ = _Sp_counted_deleter<_Ptr, _Del2, allocator<void>, _Lp>;
+ using _Alloc = allocator<_Sp_cd_type>;
+ using _Alloc_traits = allocator_traits<_Alloc>;
+ _Alloc __a;
+ _Sp_cd_type* __mem = _Alloc_traits::allocate(__a, 1);
+ _Alloc_traits::construct(__a, __mem, __r.release(),
+ __r.get_deleter()); // non-throwing
+ _M_pi = __mem;
+ }
// Throw bad_weak_ptr when __r._M_get_use_count() == 0.
explicit __shared_count(const __weak_count<_Lp>& __r);
- ~__shared_count() // nothrow
+ // Does not throw if __r._M_get_use_count() == 0, caller must check.
+ explicit __shared_count(const __weak_count<_Lp>& __r, std::nothrow_t);
+
+ ~__shared_count() noexcept
{
- if (_M_pi != 0)
+ if (_M_pi != nullptr)
_M_pi->_M_release();
}
- __shared_count(const __shared_count& __r)
- : _M_pi(__r._M_pi) // nothrow
+ __shared_count(const __shared_count& __r) noexcept
+ : _M_pi(__r._M_pi)
{
if (_M_pi != 0)
_M_pi->_M_add_ref_copy();
}
__shared_count&
- operator=(const __shared_count& __r) // nothrow
+ operator=(const __shared_count& __r) noexcept
{
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
if (__tmp != _M_pi)
}
void
- _M_swap(__shared_count& __r) // nothrow
+ _M_swap(__shared_count& __r) noexcept
{
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
__r._M_pi = _M_pi;
}
long
- _M_get_use_count() const // nothrow
+ _M_get_use_count() const noexcept
{ return _M_pi != 0 ? _M_pi->_M_get_use_count() : 0; }
bool
- _M_unique() const // nothrow
+ _M_unique() const noexcept
{ return this->_M_get_use_count() == 1; }
void*
- _M_get_deleter(const std::type_info& __ti) const
- { return _M_pi ? _M_pi->_M_get_deleter(__ti) : 0; }
+ _M_get_deleter(const std::type_info& __ti) const noexcept
+ { return _M_pi ? _M_pi->_M_get_deleter(__ti) : nullptr; }
bool
- _M_less(const __shared_count& __rhs) const
+ _M_less(const __shared_count& __rhs) const noexcept
{ return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
bool
- _M_less(const __weak_count<_Lp>& __rhs) const
+ _M_less(const __weak_count<_Lp>& __rhs) const noexcept
{ return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
// Friend function injected into enclosing namespace and found by ADL
friend inline bool
- operator==(const __shared_count& __a, const __shared_count& __b)
+ operator==(const __shared_count& __a, const __shared_count& __b) noexcept
{ return __a._M_pi == __b._M_pi; }
private:
friend class __weak_count<_Lp>;
- template<typename _Tp, typename _Del>
- static _Sp_counted_base<_Lp>*
- _S_create_from_up(std::unique_ptr<_Tp, _Del>&& __r,
- typename std::enable_if<!std::is_reference<_Del>::value>::type* = 0)
- {
- return new _Sp_counted_deleter<_Tp*, _Del, std::allocator<_Tp>,
- _Lp>(__r.get(), __r.get_deleter());
- }
-
- template<typename _Tp, typename _Del>
- static _Sp_counted_base<_Lp>*
- _S_create_from_up(std::unique_ptr<_Tp, _Del>&& __r,
- typename std::enable_if<std::is_reference<_Del>::value>::type* = 0)
- {
- typedef typename std::remove_reference<_Del>::type _Del1;
- typedef std::reference_wrapper<_Del1> _Del2;
- return new _Sp_counted_deleter<_Tp*, _Del2, std::allocator<_Tp>,
- _Lp>(__r.get(), std::ref(__r.get_deleter()));
- }
-
_Sp_counted_base<_Lp>* _M_pi;
};
class __weak_count
{
public:
- __weak_count() : _M_pi(0) // nothrow
+ constexpr __weak_count() noexcept : _M_pi(0)
{ }
- __weak_count(const __shared_count<_Lp>& __r) : _M_pi(__r._M_pi) // nothrow
+ __weak_count(const __shared_count<_Lp>& __r) noexcept
+ : _M_pi(__r._M_pi)
{
if (_M_pi != 0)
_M_pi->_M_weak_add_ref();
}
- __weak_count(const __weak_count<_Lp>& __r) : _M_pi(__r._M_pi) // nothrow
+ __weak_count(const __weak_count<_Lp>& __r) noexcept
+ : _M_pi(__r._M_pi)
{
if (_M_pi != 0)
_M_pi->_M_weak_add_ref();
}
- ~__weak_count() // nothrow
+ ~__weak_count() noexcept
{
if (_M_pi != 0)
_M_pi->_M_weak_release();
}
__weak_count<_Lp>&
- operator=(const __shared_count<_Lp>& __r) // nothrow
+ operator=(const __shared_count<_Lp>& __r) noexcept
{
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
if (__tmp != 0)
}
__weak_count<_Lp>&
- operator=(const __weak_count<_Lp>& __r) // nothrow
+ operator=(const __weak_count<_Lp>& __r) noexcept
{
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
if (__tmp != 0)
}
void
- _M_swap(__weak_count<_Lp>& __r) // nothrow
+ _M_swap(__weak_count<_Lp>& __r) noexcept
{
_Sp_counted_base<_Lp>* __tmp = __r._M_pi;
__r._M_pi = _M_pi;
}
long
- _M_get_use_count() const // nothrow
+ _M_get_use_count() const noexcept
{ return _M_pi != 0 ? _M_pi->_M_get_use_count() : 0; }
bool
- _M_less(const __weak_count& __rhs) const
+ _M_less(const __weak_count& __rhs) const noexcept
{ return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
bool
- _M_less(const __shared_count<_Lp>& __rhs) const
+ _M_less(const __shared_count<_Lp>& __rhs) const noexcept
{ return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
// Friend function injected into enclosing namespace and found by ADL
friend inline bool
- operator==(const __weak_count& __a, const __weak_count& __b)
+ operator==(const __weak_count& __a, const __weak_count& __b) noexcept
{ return __a._M_pi == __b._M_pi; }
private:
// Now that __weak_count is defined we can define this constructor:
template<_Lock_policy _Lp>
- inline __shared_count<_Lp>:: __shared_count(const __weak_count<_Lp>& __r)
+ inline
+ __shared_count<_Lp>::__shared_count(const __weak_count<_Lp>& __r)
: _M_pi(__r._M_pi)
{
- if (_M_pi != 0)
+ if (_M_pi != nullptr)
_M_pi->_M_add_ref_lock();
else
__throw_bad_weak_ptr();
}
+ // Now that __weak_count is defined we can define this constructor:
+ template<_Lock_policy _Lp>
+ inline
+ __shared_count<_Lp>::
+ __shared_count(const __weak_count<_Lp>& __r, std::nothrow_t)
+ : _M_pi(__r._M_pi)
+ {
+ if (_M_pi != nullptr)
+ if (!_M_pi->_M_add_ref_lock_nothrow())
+ _M_pi = nullptr;
+ }
// Support for enable_shared_from_this.
void
__enable_shared_from_this_helper(const __shared_count<_Lp>&,
const __enable_shared_from_this<_Tp1,
- _Lp>*, const _Tp2*);
+ _Lp>*, const _Tp2*) noexcept;
// Friend of enable_shared_from_this.
template<typename _Tp1, typename _Tp2>
void
__enable_shared_from_this_helper(const __shared_count<>&,
const enable_shared_from_this<_Tp1>*,
- const _Tp2*);
+ const _Tp2*) noexcept;
template<_Lock_policy _Lp>
inline void
- __enable_shared_from_this_helper(const __shared_count<_Lp>&, ...)
+ __enable_shared_from_this_helper(const __shared_count<_Lp>&, ...) noexcept
{ }
public:
typedef _Tp element_type;
- __shared_ptr() : _M_ptr(0), _M_refcount() // never throws
+ constexpr __shared_ptr() noexcept
+ : _M_ptr(0), _M_refcount()
{ }
template<typename _Tp1>
- explicit __shared_ptr(_Tp1* __p) : _M_ptr(__p), _M_refcount(__p)
+ explicit __shared_ptr(_Tp1* __p)
+ : _M_ptr(__p), _M_refcount(__p)
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
+ static_assert( !is_void<_Tp1>::value, "incomplete type" );
static_assert( sizeof(_Tp1) > 0, "incomplete type" );
__enable_shared_from_this_helper(_M_refcount, __p, __p);
}
}
template<typename _Tp1, typename _Deleter, typename _Alloc>
- __shared_ptr(_Tp1* __p, _Deleter __d, const _Alloc& __a)
- : _M_ptr(__p), _M_refcount(__p, __d, __a)
+ __shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a)
+ : _M_ptr(__p), _M_refcount(__p, __d, std::move(__a))
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
// TODO requires _Deleter CopyConstructible and __d(__p) well-formed
{ }
template<typename _Deleter, typename _Alloc>
- __shared_ptr(nullptr_t __p, _Deleter __d, const _Alloc& __a)
- : _M_ptr(0), _M_refcount(__p, __d, __a)
+ __shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a)
+ : _M_ptr(0), _M_refcount(__p, __d, std::move(__a))
{ }
template<typename _Tp1>
- __shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, _Tp* __p)
+ __shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, _Tp* __p) noexcept
: _M_ptr(__p), _M_refcount(__r._M_refcount) // never throws
{ }
- // generated copy constructor, assignment, destructor are fine.
+ __shared_ptr(const __shared_ptr&) noexcept = default;
+ __shared_ptr& operator=(const __shared_ptr&) noexcept = default;
+ ~__shared_ptr() = default;
- template<typename _Tp1>
- __shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r)
- : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) // never throws
- { __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) }
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ __shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r) noexcept
+ : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount)
+ { }
- __shared_ptr(__shared_ptr&& __r)
- : _M_ptr(__r._M_ptr), _M_refcount() // never throws
+ __shared_ptr(__shared_ptr&& __r) noexcept
+ : _M_ptr(__r._M_ptr), _M_refcount()
{
_M_refcount._M_swap(__r._M_refcount);
__r._M_ptr = 0;
}
- template<typename _Tp1>
- __shared_ptr(__shared_ptr<_Tp1, _Lp>&& __r)
- : _M_ptr(__r._M_ptr), _M_refcount() // never throws
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ __shared_ptr(__shared_ptr<_Tp1, _Lp>&& __r) noexcept
+ : _M_ptr(__r._M_ptr), _M_refcount()
{
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
_M_refcount._M_swap(__r._M_refcount);
__r._M_ptr = 0;
}
: _M_ptr(__r.get()), _M_refcount()
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- _Tp1* __tmp = __r.get();
+ auto __raw = _S_raw_ptr(__r.get());
_M_refcount = __shared_count<_Lp>(std::move(__r));
- __enable_shared_from_this_helper(_M_refcount, __tmp, __tmp);
+ __enable_shared_from_this_helper(_M_refcount, __raw, __raw);
}
-#if _GLIBCXX_DEPRECATED
+#if _GLIBCXX_USE_DEPRECATED
// Postcondition: use_count() == 1 and __r.get() == 0
template<typename _Tp1>
- __shared_ptr(std::auto_ptr<_Tp1>&& __r)
- : _M_ptr(__r.get()), _M_refcount()
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- static_assert( sizeof(_Tp1) > 0, "incomplete type" );
- _Tp1* __tmp = __r.get();
- _M_refcount = __shared_count<_Lp>(std::move(__r));
- __enable_shared_from_this_helper(_M_refcount, __tmp, __tmp);
- }
+ __shared_ptr(std::auto_ptr<_Tp1>&& __r);
#endif
- /* TODO: use delegating constructor */
- __shared_ptr(nullptr_t) : _M_ptr(0), _M_refcount() // never throws
- { }
+ constexpr __shared_ptr(nullptr_t) noexcept : __shared_ptr() { }
template<typename _Tp1>
__shared_ptr&
- operator=(const __shared_ptr<_Tp1, _Lp>& __r) // never throws
+ operator=(const __shared_ptr<_Tp1, _Lp>& __r) noexcept
{
_M_ptr = __r._M_ptr;
_M_refcount = __r._M_refcount; // __shared_count::op= doesn't throw
return *this;
}
-#if _GLIBCXX_DEPRECATED
+#if _GLIBCXX_USE_DEPRECATED
template<typename _Tp1>
__shared_ptr&
operator=(std::auto_ptr<_Tp1>&& __r)
#endif
__shared_ptr&
- operator=(__shared_ptr&& __r)
+ operator=(__shared_ptr&& __r) noexcept
{
__shared_ptr(std::move(__r)).swap(*this);
return *this;
template<class _Tp1>
__shared_ptr&
- operator=(__shared_ptr<_Tp1, _Lp>&& __r)
+ operator=(__shared_ptr<_Tp1, _Lp>&& __r) noexcept
{
__shared_ptr(std::move(__r)).swap(*this);
return *this;
}
void
- reset() // never throws
+ reset() noexcept
{ __shared_ptr().swap(*this); }
template<typename _Tp1>
template<typename _Tp1, typename _Deleter, typename _Alloc>
void
- reset(_Tp1* __p, _Deleter __d, const _Alloc& __a)
- { __shared_ptr(__p, __d, __a).swap(*this); }
+ reset(_Tp1* __p, _Deleter __d, _Alloc __a)
+ { __shared_ptr(__p, __d, std::move(__a)).swap(*this); }
// Allow class instantiation when _Tp is [cv-qual] void.
typename std::add_lvalue_reference<_Tp>::type
- operator*() const // never throws
+ operator*() const noexcept
{
_GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
return *_M_ptr;
}
_Tp*
- operator->() const // never throws
+ operator->() const noexcept
{
_GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
return _M_ptr;
}
_Tp*
- get() const // never throws
+ get() const noexcept
{ return _M_ptr; }
explicit operator bool() const // never throws
{ return _M_ptr == 0 ? false : true; }
bool
- unique() const // never throws
+ unique() const noexcept
{ return _M_refcount._M_unique(); }
long
- use_count() const // never throws
+ use_count() const noexcept
{ return _M_refcount._M_get_use_count(); }
void
- swap(__shared_ptr<_Tp, _Lp>& __other) // never throws
+ swap(__shared_ptr<_Tp, _Lp>& __other) noexcept
{
std::swap(_M_ptr, __other._M_ptr);
_M_refcount._M_swap(__other._M_refcount);
protected:
// This constructor is non-standard, it is used by allocate_shared.
template<typename _Alloc, typename... _Args>
- __shared_ptr(_Sp_make_shared_tag __tag, _Alloc __a, _Args&&... __args)
+ __shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a,
+ _Args&&... __args)
: _M_ptr(), _M_refcount(__tag, (_Tp*)0, __a,
std::forward<_Args>(__args)...)
{
{
void operator()(_Tp* __ptr)
{
- _M_alloc.destroy(__ptr);
- _M_alloc.deallocate(__ptr, 1);
+ __allocated_ptr<_Alloc> __guard{ _M_alloc, __ptr };
+ allocator_traits<_Alloc>::destroy(_M_alloc, __guard.get());
}
_Alloc _M_alloc;
};
template<typename _Alloc, typename... _Args>
- __shared_ptr(_Sp_make_shared_tag __tag, _Alloc __a, _Args&&... __args)
+ __shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a,
+ _Args&&... __args)
: _M_ptr(), _M_refcount()
- {
- typedef typename _Alloc::template rebind<_Tp>::other _Alloc2;
- _Deleter<_Alloc2> __del = { _Alloc2(__a) };
- _M_ptr = __del._M_alloc.allocate(1);
- __try
- {
- __del._M_alloc.construct(_M_ptr, std::forward<_Args>(__args)...);
- }
- __catch(...)
- {
- __del._M_alloc.deallocate(_M_ptr, 1);
- __throw_exception_again;
- }
- __shared_count<_Lp> __count(_M_ptr, __del, __del._M_alloc);
- _M_refcount._M_swap(__count);
+ {
+ typedef typename allocator_traits<_Alloc>::template
+ rebind_traits<_Tp> __traits;
+ _Deleter<typename __traits::allocator_type> __del = { __a };
+ auto __guard = std::__allocate_guarded(__del._M_alloc);
+ _M_ptr = __guard.get();
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2070. allocate_shared should use allocator_traits<A>::construct
+ __traits::construct(__del._M_alloc, _M_ptr,
+ std::forward<_Args>(__args)...);
+ __guard = nullptr;
+ __shared_count<_Lp> __count(_M_ptr, __del, __del._M_alloc);
+ _M_refcount._M_swap(__count);
__enable_shared_from_this_helper(_M_refcount, _M_ptr, _M_ptr);
- }
+ }
#endif
template<typename _Tp1, _Lock_policy _Lp1, typename _Alloc,
typename... _Args>
friend __shared_ptr<_Tp1, _Lp1>
- __allocate_shared(_Alloc __a, _Args&&... __args);
+ __allocate_shared(const _Alloc& __a, _Args&&... __args);
+
+ // This constructor is used by __weak_ptr::lock() and
+ // shared_ptr::shared_ptr(const weak_ptr&, std::nothrow_t).
+ __shared_ptr(const __weak_ptr<_Tp, _Lp>& __r, std::nothrow_t)
+ : _M_refcount(__r._M_refcount, std::nothrow)
+ {
+ _M_ptr = _M_refcount._M_get_use_count() ? __r._M_ptr : nullptr;
+ }
+
+ friend class __weak_ptr<_Tp, _Lp>;
private:
void*
- _M_get_deleter(const std::type_info& __ti) const
+ _M_get_deleter(const std::type_info& __ti) const noexcept
{ return _M_refcount._M_get_deleter(__ti); }
+ template<typename _Tp1>
+ static _Tp1*
+ _S_raw_ptr(_Tp1* __ptr)
+ { return __ptr; }
+
+ template<typename _Tp1>
+ static auto
+ _S_raw_ptr(_Tp1 __ptr) -> decltype(std::__addressof(*__ptr))
+ { return std::__addressof(*__ptr); }
+
template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
template<typename _Del, typename _Tp1, _Lock_policy _Lp1>
- friend _Del* get_deleter(const __shared_ptr<_Tp1, _Lp1>&);
+ friend _Del* get_deleter(const __shared_ptr<_Tp1, _Lp1>&) noexcept;
_Tp* _M_ptr; // Contained pointer.
__shared_count<_Lp> _M_refcount; // Reference counter.
};
- // 20.8.13.2.7 shared_ptr comparisons
+ // 20.7.2.2.7 shared_ptr comparisons
template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
inline bool
operator==(const __shared_ptr<_Tp1, _Lp>& __a,
- const __shared_ptr<_Tp2, _Lp>& __b)
+ const __shared_ptr<_Tp2, _Lp>& __b) noexcept
{ return __a.get() == __b.get(); }
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator==(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
+ { return !__a; }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator==(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
+ { return !__a; }
+
template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
inline bool
operator!=(const __shared_ptr<_Tp1, _Lp>& __a,
- const __shared_ptr<_Tp2, _Lp>& __b)
+ const __shared_ptr<_Tp2, _Lp>& __b) noexcept
{ return __a.get() != __b.get(); }
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator!=(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
+ { return (bool)__a; }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator!=(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
+ { return (bool)__a; }
+
template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
inline bool
operator<(const __shared_ptr<_Tp1, _Lp>& __a,
- const __shared_ptr<_Tp2, _Lp>& __b)
- { return __a.get() < __b.get(); }
+ const __shared_ptr<_Tp2, _Lp>& __b) noexcept
+ {
+ typedef typename std::common_type<_Tp1*, _Tp2*>::type _CT;
+ return std::less<_CT>()(__a.get(), __b.get());
+ }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator<(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
+ { return std::less<_Tp*>()(__a.get(), nullptr); }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator<(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
+ { return std::less<_Tp*>()(nullptr, __a.get()); }
+
+ template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
+ inline bool
+ operator<=(const __shared_ptr<_Tp1, _Lp>& __a,
+ const __shared_ptr<_Tp2, _Lp>& __b) noexcept
+ { return !(__b < __a); }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator<=(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
+ { return !(nullptr < __a); }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator<=(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
+ { return !(__a < nullptr); }
+
+ template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
+ inline bool
+ operator>(const __shared_ptr<_Tp1, _Lp>& __a,
+ const __shared_ptr<_Tp2, _Lp>& __b) noexcept
+ { return (__b < __a); }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator>(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
+ { return std::less<_Tp*>()(nullptr, __a.get()); }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator>(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
+ { return std::less<_Tp*>()(__a.get(), nullptr); }
+
+ template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
+ inline bool
+ operator>=(const __shared_ptr<_Tp1, _Lp>& __a,
+ const __shared_ptr<_Tp2, _Lp>& __b) noexcept
+ { return !(__a < __b); }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator>=(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
+ { return !(__a < nullptr); }
+
+ template<typename _Tp, _Lock_policy _Lp>
+ inline bool
+ operator>=(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
+ { return !(nullptr < __a); }
template<typename _Sp>
struct _Sp_less : public binary_function<_Sp, _Sp, bool>
{
bool
- operator()(const _Sp& __lhs, const _Sp& __rhs) const
+ operator()(const _Sp& __lhs, const _Sp& __rhs) const noexcept
{
typedef typename _Sp::element_type element_type;
return std::less<element_type*>()(__lhs.get(), __rhs.get());
: public _Sp_less<__shared_ptr<_Tp, _Lp>>
{ };
- // XXX LessThanComparable<_Tp> concept should provide >, >= and <=
- template<typename _Tp, _Lock_policy _Lp>
- inline bool
- operator>(const __shared_ptr<_Tp, _Lp>& __a,
- const __shared_ptr<_Tp, _Lp>& __b)
- { return __a.get() > __b.get(); }
-
- template<typename _Tp, _Lock_policy _Lp>
- inline bool
- operator>=(const __shared_ptr<_Tp, _Lp>& __a,
- const __shared_ptr<_Tp, _Lp>& __b)
- { return __a.get() >= __b.get(); }
-
- template<typename _Tp, _Lock_policy _Lp>
- inline bool
- operator<=(const __shared_ptr<_Tp, _Lp>& __a,
- const __shared_ptr<_Tp, _Lp>& __b)
- { return __a.get() <= __b.get(); }
-
- // 2.2.3.8 shared_ptr specialized algorithms.
+ // 20.7.2.2.8 shared_ptr specialized algorithms.
template<typename _Tp, _Lock_policy _Lp>
inline void
- swap(__shared_ptr<_Tp, _Lp>& __a, __shared_ptr<_Tp, _Lp>& __b)
+ swap(__shared_ptr<_Tp, _Lp>& __a, __shared_ptr<_Tp, _Lp>& __b) noexcept
{ __a.swap(__b); }
- // 2.2.3.9 shared_ptr casts
+ // 20.7.2.2.9 shared_ptr casts
// The seemingly equivalent code:
// shared_ptr<_Tp, _Lp>(static_cast<_Tp*>(__r.get()))
/// static_pointer_cast
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
inline __shared_ptr<_Tp, _Lp>
- static_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
+ static_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r) noexcept
{ return __shared_ptr<_Tp, _Lp>(__r, static_cast<_Tp*>(__r.get())); }
// The seemingly equivalent code:
/// const_pointer_cast
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
inline __shared_ptr<_Tp, _Lp>
- const_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
+ const_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r) noexcept
{ return __shared_ptr<_Tp, _Lp>(__r, const_cast<_Tp*>(__r.get())); }
// The seemingly equivalent code:
/// dynamic_pointer_cast
template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
inline __shared_ptr<_Tp, _Lp>
- dynamic_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
+ dynamic_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r) noexcept
{
if (_Tp* __p = dynamic_cast<_Tp*>(__r.get()))
return __shared_ptr<_Tp, _Lp>(__r, __p);
public:
typedef _Tp element_type;
- __weak_ptr() : _M_ptr(0), _M_refcount() // never throws
+ constexpr __weak_ptr() noexcept
+ : _M_ptr(0), _M_refcount()
{ }
- // Generated copy constructor, assignment, destructor are fine.
+ __weak_ptr(const __weak_ptr&) noexcept = default;
+ __weak_ptr& operator=(const __weak_ptr&) noexcept = default;
+ ~__weak_ptr() = default;
// The "obvious" converting constructor implementation:
//
//
// It is not possible to avoid spurious access violations since
// in multithreaded programs __r._M_ptr may be invalidated at any point.
- template<typename _Tp1>
- __weak_ptr(const __weak_ptr<_Tp1, _Lp>& __r)
- : _M_refcount(__r._M_refcount) // never throws
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- _M_ptr = __r.lock().get();
- }
-
- template<typename _Tp1>
- __weak_ptr(const __shared_ptr<_Tp1, _Lp>& __r)
- : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) // never throws
- { __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) }
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ __weak_ptr(const __weak_ptr<_Tp1, _Lp>& __r) noexcept
+ : _M_refcount(__r._M_refcount)
+ { _M_ptr = __r.lock().get(); }
+
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ __weak_ptr(const __shared_ptr<_Tp1, _Lp>& __r) noexcept
+ : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount)
+ { }
template<typename _Tp1>
__weak_ptr&
- operator=(const __weak_ptr<_Tp1, _Lp>& __r) // never throws
+ operator=(const __weak_ptr<_Tp1, _Lp>& __r) noexcept
{
_M_ptr = __r.lock().get();
_M_refcount = __r._M_refcount;
template<typename _Tp1>
__weak_ptr&
- operator=(const __shared_ptr<_Tp1, _Lp>& __r) // never throws
+ operator=(const __shared_ptr<_Tp1, _Lp>& __r) noexcept
{
_M_ptr = __r._M_ptr;
_M_refcount = __r._M_refcount;
}
__shared_ptr<_Tp, _Lp>
- lock() const // never throws
- {
-#ifdef __GTHREADS
- // Optimization: avoid throw overhead.
- if (expired())
- return __shared_ptr<element_type, _Lp>();
-
- __try
- {
- return __shared_ptr<element_type, _Lp>(*this);
- }
- __catch(const bad_weak_ptr&)
- {
- // Q: How can we get here?
- // A: Another thread may have invalidated r after the
- // use_count test above.
- return __shared_ptr<element_type, _Lp>();
- }
-
-#else
- // Optimization: avoid try/catch overhead when single threaded.
- return expired() ? __shared_ptr<element_type, _Lp>()
- : __shared_ptr<element_type, _Lp>(*this);
-
-#endif
- } // XXX MT
+ lock() const noexcept
+ { return __shared_ptr<element_type, _Lp>(*this, std::nothrow); }
long
- use_count() const // never throws
+ use_count() const noexcept
{ return _M_refcount._M_get_use_count(); }
bool
- expired() const // never throws
+ expired() const noexcept
{ return _M_refcount._M_get_use_count() == 0; }
template<typename _Tp1>
{ return _M_refcount._M_less(__rhs._M_refcount); }
void
- reset() // never throws
+ reset() noexcept
{ __weak_ptr().swap(*this); }
void
- swap(__weak_ptr& __s) // never throws
+ swap(__weak_ptr& __s) noexcept
{
std::swap(_M_ptr, __s._M_ptr);
_M_refcount._M_swap(__s._M_refcount);
private:
// Used by __enable_shared_from_this.
void
- _M_assign(_Tp* __ptr, const __shared_count<_Lp>& __refcount)
+ _M_assign(_Tp* __ptr, const __shared_count<_Lp>& __refcount) noexcept
{
_M_ptr = __ptr;
_M_refcount = __refcount;
__weak_count<_Lp> _M_refcount; // Reference counter.
};
- // 20.8.13.3.7 weak_ptr specialized algorithms.
+ // 20.7.2.3.6 weak_ptr specialized algorithms.
template<typename _Tp, _Lock_policy _Lp>
inline void
- swap(__weak_ptr<_Tp, _Lp>& __a, __weak_ptr<_Tp, _Lp>& __b)
+ swap(__weak_ptr<_Tp, _Lp>& __a, __weak_ptr<_Tp, _Lp>& __b) noexcept
{ __a.swap(__b); }
template<typename _Tp, typename _Tp1>
class __enable_shared_from_this
{
protected:
- __enable_shared_from_this() { }
+ constexpr __enable_shared_from_this() noexcept { }
- __enable_shared_from_this(const __enable_shared_from_this&) { }
+ __enable_shared_from_this(const __enable_shared_from_this&) noexcept { }
__enable_shared_from_this&
- operator=(const __enable_shared_from_this&)
+ operator=(const __enable_shared_from_this&) noexcept
{ return *this; }
~__enable_shared_from_this() { }
private:
template<typename _Tp1>
void
- _M_weak_assign(_Tp1* __p, const __shared_count<_Lp>& __n) const
+ _M_weak_assign(_Tp1* __p, const __shared_count<_Lp>& __n) const noexcept
{ _M_weak_this._M_assign(__p, __n); }
template<typename _Tp1>
friend void
__enable_shared_from_this_helper(const __shared_count<_Lp>& __pn,
const __enable_shared_from_this* __pe,
- const _Tp1* __px)
+ const _Tp1* __px) noexcept
{
if (__pe != 0)
__pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn);
template<typename _Tp, _Lock_policy _Lp, typename _Alloc, typename... _Args>
inline __shared_ptr<_Tp, _Lp>
- __allocate_shared(_Alloc __a, _Args&&... __args)
+ __allocate_shared(const _Alloc& __a, _Args&&... __args)
{
- return __shared_ptr<_Tp, _Lp>(_Sp_make_shared_tag(),
- std::forward<_Alloc>(__a), std::forward<_Args>(__args)...);
+ return __shared_ptr<_Tp, _Lp>(_Sp_make_shared_tag(), __a,
+ std::forward<_Args>(__args)...);
}
template<typename _Tp, _Lock_policy _Lp, typename... _Args>
__make_shared(_Args&&... __args)
{
typedef typename std::remove_const<_Tp>::type _Tp_nc;
- return __allocate_shared<_Tp, _Lp>(std::allocator<_Tp_nc>(),
- std::forward<_Args>(__args)...);
+ return std::__allocate_shared<_Tp, _Lp>(std::allocator<_Tp_nc>(),
+ std::forward<_Args>(__args)...);
}
-_GLIBCXX_END_NAMESPACE
+ /// std::hash specialization for __shared_ptr.
+ template<typename _Tp, _Lock_policy _Lp>
+ struct hash<__shared_ptr<_Tp, _Lp>>
+ : public __hash_base<size_t, __shared_ptr<_Tp, _Lp>>
+ {
+ size_t
+ operator()(const __shared_ptr<_Tp, _Lp>& __s) const noexcept
+ { return std::hash<_Tp*>()(__s.get()); }
+ };
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
#endif // _SHARED_PTR_BASE_H
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