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/max_align_t.h> 14 #include <__cstddef/size_t.h> 15 #include <__fwd/memory_resource.h> 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 [[nodiscard]] [[using __gnu__: __returns_nonnull__, __alloc_size__(2), __alloc_align__(3)]] 36 _LIBCPP_HIDE_FROM_ABI void* allocate(size_t __bytes, size_t __align = __max_align) { 37 return do_allocate(__bytes, __align); 38 } 39 40 [[__gnu__::__nonnull__]] _LIBCPP_HIDE_FROM_ABI void 41 deallocate(void* __p, size_t __bytes, size_t __align = __max_align) { 42 do_deallocate(__p, __bytes, __align); 43 } 44 45 _LIBCPP_HIDE_FROM_ABI bool is_equal(const memory_resource& __other) const noexcept { return do_is_equal(__other); } 46 47 private: 48 virtual void* do_allocate(size_t, size_t) = 0; 49 virtual void do_deallocate(void*, size_t, size_t) = 0; 50 virtual bool do_is_equal(memory_resource const&) const noexcept = 0; 51 }; 52 53 // [mem.res.eq] 54 55 inline _LIBCPP_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool 56 operator==(const memory_resource& __lhs, const memory_resource& __rhs) noexcept { 57 return &__lhs == &__rhs || __lhs.is_equal(__rhs); 58 } 59 60 # if _LIBCPP_STD_VER <= 17 61 62 inline _LIBCPP_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool 63 operator!=(const memory_resource& __lhs, const memory_resource& __rhs) noexcept { 64 return !(__lhs == __rhs); 65 } 66 67 # endif 68 69 // [mem.res.global] 70 71 [[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 72 get_default_resource() noexcept; 73 74 [[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 75 set_default_resource(memory_resource*) noexcept; 76 77 [[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 78 new_delete_resource() noexcept; 79 80 [[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource* 81 null_memory_resource() noexcept; 82 83 } // namespace pmr 84 85 _LIBCPP_END_NAMESPACE_STD 86 87 #endif // _LIBCPP_STD_VER >= 17 88 89 #endif // _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H 90