From: Jonathan Wakely Date: Tue, 24 Jul 2018 13:03:20 +0000 (+0100) Subject: Make __resource_adaptor_imp usable with C++17 memory_resource X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7a4be380498046d9b0f88d32ff5a3189c913cc75;p=gcc.git Make __resource_adaptor_imp usable with C++17 memory_resource By making the memory_resource base class a template parameter the __resource_adaptor_imp can be used to adapt an allocator into a std::pmr::memory_resource instead of experimental::pmr::memory_resource. * include/experimental/memory_resource: Adjust comments and whitespace. (__resource_adaptor_imp): Add second template parameter for type of memory resource base class. (memory_resource): Define default constructor, destructor, copy constructor and copy assignment operator as defaulted. From-SVN: r262944 --- diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog index 1f87a12e292..ede29a49749 100644 --- a/libstdc++-v3/ChangeLog +++ b/libstdc++-v3/ChangeLog @@ -1,5 +1,12 @@ 2018-07-24 Jonathan Wakely + * include/experimental/memory_resource: Adjust comments and + whitespace. + (__resource_adaptor_imp): Add second template parameter for type of + memory resource base class. + (memory_resource): Define default constructor, destructor, copy + constructor and copy assignment operator as defaulted. + PR libstdc++/70966 * include/experimental/memory_resource (__get_default_resource): Use placement new to create an object with dynamic storage duration. diff --git a/libstdc++-v3/include/experimental/memory_resource b/libstdc++-v3/include/experimental/memory_resource index 83379d1367a..7ce64457a11 100644 --- a/libstdc++-v3/include/experimental/memory_resource +++ b/libstdc++-v3/include/experimental/memory_resource @@ -29,12 +29,12 @@ #ifndef _GLIBCXX_EXPERIMENTAL_MEMORY_RESOURCE #define _GLIBCXX_EXPERIMENTAL_MEMORY_RESOURCE 1 -#include +#include // align, uses_allocator, __uses_alloc +#include // pair, experimental::erased_type +#include // atomic #include -#include -#include #include -#include +#include namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { @@ -51,39 +51,41 @@ inline namespace fundamentals_v2 { namespace pmr { #define __cpp_lib_experimental_memory_resources 201402L + // Standard memory resources + + // 8.5 Class memory_resource class memory_resource; - template + // 8.6 Class template polymorphic_allocator + template class polymorphic_allocator; - template + template class __resource_adaptor_imp; - template + // 8.7 Alias template resource_adaptor + template using resource_adaptor = __resource_adaptor_imp< typename allocator_traits<_Alloc>::template rebind_alloc>; - template - struct __uses_allocator_construction_helper; - - // Global memory resources + // 8.8 Global memory resources memory_resource* new_delete_resource() noexcept; memory_resource* null_memory_resource() noexcept; - - // The default memory resource memory_resource* get_default_resource() noexcept; memory_resource* set_default_resource(memory_resource* __r) noexcept; - // Standard memory resources + // TODO 8.9 Pool resource classes - // 8.5 Class memory_resource class memory_resource { - protected: static constexpr size_t _S_max_align = alignof(max_align_t); public: - virtual ~memory_resource() { } + memory_resource() = default; + memory_resource(const memory_resource&) = default; + virtual ~memory_resource() = default; + + memory_resource& operator=(const memory_resource&) = default; void* allocate(size_t __bytes, size_t __alignment = _S_max_align) @@ -109,18 +111,15 @@ namespace pmr { }; inline bool - operator==(const memory_resource& __a, - const memory_resource& __b) noexcept + operator==(const memory_resource& __a, const memory_resource& __b) noexcept { return &__a == &__b || __a.is_equal(__b); } inline bool - operator!=(const memory_resource& __a, - const memory_resource& __b) noexcept + operator!=(const memory_resource& __a, const memory_resource& __b) noexcept { return !(__a == __b); } - // 8.6 Class template polymorphic_allocator - template + template class polymorphic_allocator { using __uses_alloc1_ = __uses_alloc1; @@ -134,14 +133,15 @@ namespace pmr { template void _M_construct(__uses_alloc1_, _Tp1* __p, _Args&&... __args) - { ::new(__p) _Tp1(allocator_arg, this->resource(), - std::forward<_Args>(__args)...); } + { + ::new(__p) _Tp1(allocator_arg, this->resource(), + std::forward<_Args>(__args)...); + } template void _M_construct(__uses_alloc2_, _Tp1* __p, _Args&&... __args) - { ::new(__p) _Tp1(std::forward<_Args>(__args)..., - this->resource()); } + { ::new(__p) _Tp1(std::forward<_Args>(__args)..., this->resource()); } public: using value_type = _Tp; @@ -169,11 +169,13 @@ namespace pmr { { return static_cast<_Tp*>(_M_resource->allocate(__n * sizeof(_Tp), alignof(_Tp))); } - void deallocate(_Tp* __p, size_t __n) + void + deallocate(_Tp* __p, size_t __n) { _M_resource->deallocate(__p, __n * sizeof(_Tp), alignof(_Tp)); } template //used here - void construct(_Tp1* __p, _Args&&... __args) + void + construct(_Tp1* __p, _Args&&... __args) { memory_resource* const __resource = this->resource(); auto __use_tag @@ -184,9 +186,9 @@ namespace pmr { // Specializations for pair using piecewise construction template - void construct(pair<_Tp1, _Tp2>* __p, piecewise_construct_t, - tuple<_Args1...> __x, - tuple<_Args2...> __y) + void + construct(pair<_Tp1, _Tp2>* __p, piecewise_construct_t, + tuple<_Args1...> __x, tuple<_Args2...> __y) { memory_resource* const __resource = this->resource(); auto __x_use_tag = @@ -200,36 +202,48 @@ namespace pmr { } template - void construct(pair<_Tp1,_Tp2>* __p) + void + construct(pair<_Tp1,_Tp2>* __p) { this->construct(__p, piecewise_construct, tuple<>(), tuple<>()); } template - void construct(pair<_Tp1,_Tp2>* __p, _Up&& __x, _Vp&& __y) - { this->construct(__p, piecewise_construct, + void + construct(pair<_Tp1,_Tp2>* __p, _Up&& __x, _Vp&& __y) + { + this->construct(__p, piecewise_construct, forward_as_tuple(std::forward<_Up>(__x)), - forward_as_tuple(std::forward<_Vp>(__y))); } + forward_as_tuple(std::forward<_Vp>(__y))); + } template - void construct(pair<_Tp1,_Tp2>* __p, const std::pair<_Up, _Vp>& __pr) - { this->construct(__p, piecewise_construct, forward_as_tuple(__pr.first), - forward_as_tuple(__pr.second)); } + void + construct(pair<_Tp1,_Tp2>* __p, const std::pair<_Up, _Vp>& __pr) + { + this->construct(__p, piecewise_construct, + forward_as_tuple(__pr.first), + forward_as_tuple(__pr.second)); + } template - void construct(pair<_Tp1,_Tp2>* __p, pair<_Up, _Vp>&& __pr) - { this->construct(__p, piecewise_construct, + void + construct(pair<_Tp1,_Tp2>* __p, pair<_Up, _Vp>&& __pr) + { + this->construct(__p, piecewise_construct, forward_as_tuple(std::forward<_Up>(__pr.first)), - forward_as_tuple(std::forward<_Vp>(__pr.second))); } + forward_as_tuple(std::forward<_Vp>(__pr.second))); + } template - void destroy(_Up* __p) + void + destroy(_Up* __p) { __p->~_Up(); } // Return a default-constructed allocator (no allocator propagation) - polymorphic_allocator select_on_container_copy_construction() const + polymorphic_allocator + select_on_container_copy_construction() const { return polymorphic_allocator(); } - memory_resource* resource() const - { return _M_resource; } + memory_resource* resource() const { return _M_resource; } private: template @@ -252,18 +266,21 @@ namespace pmr { }; template - bool operator==(const polymorphic_allocator<_Tp1>& __a, - const polymorphic_allocator<_Tp2>& __b) noexcept + bool + operator==(const polymorphic_allocator<_Tp1>& __a, + const polymorphic_allocator<_Tp2>& __b) noexcept { return *__a.resource() == *__b.resource(); } template - bool operator!=(const polymorphic_allocator<_Tp1>& __a, - const polymorphic_allocator<_Tp2>& __b) noexcept + bool + operator!=(const polymorphic_allocator<_Tp1>& __a, + const polymorphic_allocator<_Tp2>& __b) noexcept { return !(__a == __b); } + class __resource_adaptor_common { - template friend class __resource_adaptor_imp; + template friend class __resource_adaptor_imp; struct _AlignMgr { @@ -376,10 +393,12 @@ namespace pmr { }; // 8.7.1 __resource_adaptor_imp - template + template class __resource_adaptor_imp - : public memory_resource, private __resource_adaptor_common + : public _Resource, private __resource_adaptor_common { + using memory_resource = _Resource; + static_assert(is_same::value_type>::value, "Allocator's value_type is char"); @@ -514,11 +533,11 @@ namespace pmr { __r = new_delete_resource(); return __get_default_resource().exchange(__r); } + } // namespace pmr } // namespace fundamentals_v2 } // namespace experimental _GLIBCXX_END_NAMESPACE_VERSION } // namespace std - -#endif +#endif // _GLIBCXX_EXPERIMENTAL_MEMORY_RESOURCE