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 <__fwd/memory_resource.h> 14 #include <cstddef> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 #if _LIBCPP_STD_VER >= 17 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 namespace pmr { 25 26 // [mem.res.class] 27 28 class _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource { 29 static const size_t __max_align = alignof(max_align_t); 30 31 public: 32 virtual ~memory_resource(); 33 34 [[nodiscard]] [[using __gnu__: __returns_nonnull__, __alloc_size__(2), __alloc_align__(3)]] 35 _LIBCPP_HIDE_FROM_ABI void* 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_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool 55 operator==(const memory_resource& __lhs, const memory_resource& __rhs) noexcept { 56 return &__lhs == &__rhs || __lhs.is_equal(__rhs); 57 } 58 59 # if _LIBCPP_STD_VER <= 17 60 61 inline _LIBCPP_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool 62 operator!=(const memory_resource& __lhs, const memory_resource& __rhs) noexcept { 63 return !(__lhs == __rhs); 64 } 65 66 # endif 67 68 // [mem.res.global] 69 70 [[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 71 get_default_resource() noexcept; 72 73 [[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 74 set_default_resource(memory_resource*) noexcept; 75 76 [[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 77 new_delete_resource() noexcept; 78 79 [[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 80 null_memory_resource() noexcept; 81 82 } // namespace pmr 83 84 _LIBCPP_END_NAMESPACE_STD 85 86 #endif // _LIBCPP_STD_VER >= 17 87 88 #endif // _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H 89