vendor/llvm-project/llvmorg-16-init-18548-gb0daacf58f41

1 files changed, 75 insertions, 0 deletions

diff --git a/libcxx/include/__memory_resource/memory_resource.h b/libcxx/include/__memory_resource/memory_resource.h
new file mode 100644
index 000000000000..02fdd081cce5
--- /dev/null
+++ b/libcxx/include/__memory_resource/memory_resource.h
@@ -0,0 +1,75 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H
+#define _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H
+
+#include <__config>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER > 14
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace pmr {
+
+// [mem.res.class]
+
+class _LIBCPP_TYPE_VIS memory_resource {
+  static const size_t __max_align = alignof(max_align_t);
+
+public:
+  virtual ~memory_resource();
+
+  _LIBCPP_NODISCARD_AFTER_CXX17
+  [[using __gnu__: __returns_nonnull__, __alloc_size__(2), __alloc_align__(3)]] _LIBCPP_HIDE_FROM_ABI void*
+  allocate(size_t __bytes, size_t __align = __max_align) {
+    return do_allocate(__bytes, __align);
+  }
+
+  [[__gnu__::__nonnull__]] _LIBCPP_HIDE_FROM_ABI void
+  deallocate(void* __p, size_t __bytes, size_t __align = __max_align) {
+    do_deallocate(__p, __bytes, __align);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI bool is_equal(const memory_resource& __other) const noexcept { return do_is_equal(__other); }
+
+private:
+  virtual void* do_allocate(size_t, size_t)                       = 0;
+  virtual void do_deallocate(void*, size_t, size_t)               = 0;
+  virtual bool do_is_equal(memory_resource const&) const noexcept = 0;
+};
+
+// [mem.res.eq]
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator==(const memory_resource& __lhs, const memory_resource& __rhs) noexcept {
+  return &__lhs == &__rhs || __lhs.is_equal(__rhs);
+}
+
+inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const memory_resource& __lhs, const memory_resource& __rhs) noexcept {
+  return !(__lhs == __rhs);
+}
+
+// [mem.res.global]
+
+[[__gnu__::__returns_nonnull__]] _LIBCPP_FUNC_VIS memory_resource* get_default_resource() noexcept;
+[[__gnu__::__returns_nonnull__]] _LIBCPP_FUNC_VIS memory_resource* set_default_resource(memory_resource*) noexcept;
+[[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_FUNC_VIS memory_resource* new_delete_resource() noexcept;
+[[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_FUNC_VIS memory_resource* null_memory_resource() noexcept;
+
+} // namespace pmr
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER > 14
+
+#endif // _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H