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 <__availability> 13 #include <__config> 14 #include <__fwd/memory_resource.h> 15 #include <cstddef> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 #if _LIBCPP_STD_VER >= 17 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 namespace pmr { 26 27 // [mem.res.class] 28 29 class _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource { 30 static const size_t __max_align = alignof(max_align_t); 31 32 public: 33 virtual ~memory_resource(); 34 35 _LIBCPP_NODISCARD_AFTER_CXX17 36 [[using __gnu__: __returns_nonnull__, __alloc_size__(2), __alloc_align__(3)]] _LIBCPP_HIDE_FROM_ABI void* 37 allocate(size_t __bytes, size_t __align = __max_align) { 38 return do_allocate(__bytes, __align); 39 } 40 41 [[__gnu__::__nonnull__]] _LIBCPP_HIDE_FROM_ABI void 42 deallocate(void* __p, size_t __bytes, size_t __align = __max_align) { 43 do_deallocate(__p, __bytes, __align); 44 } 45 is_equal(const memory_resource & __other)46 _LIBCPP_HIDE_FROM_ABI bool is_equal(const memory_resource& __other) const noexcept { return do_is_equal(__other); } 47 48 private: 49 virtual void* do_allocate(size_t, size_t) = 0; 50 virtual void do_deallocate(void*, size_t, size_t) = 0; 51 virtual bool do_is_equal(memory_resource const&) const noexcept = 0; 52 }; 53 54 // [mem.res.eq] 55 56 inline _LIBCPP_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool 57 operator==(const memory_resource& __lhs, const memory_resource& __rhs) noexcept { 58 return &__lhs == &__rhs || __lhs.is_equal(__rhs); 59 } 60 61 # if _LIBCPP_STD_VER <= 17 62 63 inline _LIBCPP_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool 64 operator!=(const memory_resource& __lhs, const memory_resource& __rhs) noexcept { 65 return !(__lhs == __rhs); 66 } 67 68 # endif 69 70 // [mem.res.global] 71 72 [[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 73 get_default_resource() noexcept; 74 75 [[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 76 set_default_resource(memory_resource*) noexcept; 77 78 [[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 79 new_delete_resource() noexcept; 80 81 [[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 82 null_memory_resource() noexcept; 83 84 } // namespace pmr 85 86 _LIBCPP_END_NAMESPACE_STD 87 88 #endif // _LIBCPP_STD_VER >= 17 89 90 #endif // _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H 91