libcxx/include/__utility/piecewise_construct.h

   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___UTILITY_PIECEWISE_CONSTRUCT_H
  10 #define _LIBCPP___UTILITY_PIECEWISE_CONSTRUCT_H
  11
  12 #include <__config>
  13
  14 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  15 #  pragma GCC system_header
  16 #endif
  17
  18 _LIBCPP_BEGIN_NAMESPACE_STD
  19
  20 struct _LIBCPP_TEMPLATE_VIS piecewise_construct_t {
  21   explicit piecewise_construct_t() = default;
  22 };
  23
  24 #if _LIBCPP_STD_VER >= 17
  25 inline constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
  26 #elif !defined(_LIBCPP_CXX03_LANG)
  27 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
  28 #endif
  29
  30 _LIBCPP_END_NAMESPACE_STD
  31
  32 #endif // _LIBCPP___UTILITY_PIECEWISE_CONSTRUCT_H