1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H 10 #define _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H 11 12 #include <__config> 13 #include <cstddef> 14 15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 16 # pragma GCC system_header 17 #endif 18 19 #if _LIBCPP_STD_VER >= 17 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 namespace pmr { 24 25 // [mem.res.class] 26 27 class _LIBCPP_TYPE_VIS memory_resource { 28 static const size_t __max_align = alignof(max_align_t); 29 30 public: 31 virtual ~memory_resource(); 32 33 _LIBCPP_NODISCARD_AFTER_CXX17 34 [[using __gnu__: __returns_nonnull__, __alloc_size__(2), __alloc_align__(3)]] _LIBCPP_HIDE_FROM_ABI void* 35 allocate(size_t __bytes, size_t __align = __max_align) { 36 return do_allocate(__bytes, __align); 37 } 38 39 [[__gnu__::__nonnull__]] _LIBCPP_HIDE_FROM_ABI void 40 deallocate(void* __p, size_t __bytes, size_t __align = __max_align) { 41 do_deallocate(__p, __bytes, __align); 42 } 43 is_equal(const memory_resource & __other)44 _LIBCPP_HIDE_FROM_ABI bool is_equal(const memory_resource& __other) const noexcept { return do_is_equal(__other); } 45 46 private: 47 virtual void* do_allocate(size_t, size_t) = 0; 48 virtual void do_deallocate(void*, size_t, size_t) = 0; 49 virtual bool do_is_equal(memory_resource const&) const noexcept = 0; 50 }; 51 52 // [mem.res.eq] 53 54 inline _LIBCPP_HIDE_FROM_ABI bool operator==(const memory_resource& __lhs, const memory_resource& __rhs) noexcept { 55 return &__lhs == &__rhs || __lhs.is_equal(__rhs); 56 } 57 58 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const memory_resource& __lhs, const memory_resource& __rhs) noexcept { 59 return !(__lhs == __rhs); 60 } 61 62 // [mem.res.global] 63 64 [[__gnu__::__returns_nonnull__]] _LIBCPP_FUNC_VIS memory_resource* get_default_resource() noexcept; 65 [[__gnu__::__returns_nonnull__]] _LIBCPP_FUNC_VIS memory_resource* set_default_resource(memory_resource*) noexcept; 66 [[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_FUNC_VIS memory_resource* new_delete_resource() noexcept; 67 [[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_FUNC_VIS memory_resource* null_memory_resource() noexcept; 68 69 } // namespace pmr 70 71 _LIBCPP_END_NAMESPACE_STD 72 73 #endif // _LIBCPP_STD_VER >= 17 74 75 #endif // _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H 76