chromium/third_party/libc++/src/include/__utility/no_destroy.h

//===----------------------------------------------------------------------===//
//
// 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___UTILITY_NO_DESTROY_H
#define _LIBCPP___UTILITY_NO_DESTROY_H

#include <__config>
#include <__type_traits/is_constant_evaluated.h>
#include <__utility/forward.h>
#include <new>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

struct __uninitialized_tag { … };

// This class stores an object of type _Tp but never destroys it.
//
// This is akin to using __attribute__((no_destroy)), except that it is possible
// to control the lifetime of the object with more flexibility by deciding e.g.
// whether to initialize the object at construction or to defer to a later
// initialization using __emplace.
template <class _Tp>
struct __no_destroy { … };

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___UTILITY_NO_DESTROY_H