CMake/Utilities/std/cm/utility

// -*-c++-*-
// vim: set ft=cpp:

/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file LICENSE.rst or https://cmake.org/licensing for details.  */
#pragma once

#if __cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
#  define CMake_HAVE_CXX_IN_PLACE
#endif

#include <utility> // IWYU pragma: export

namespace cm {

#if defined(CMake_HAVE_CXX_IN_PLACE)

using std::in_place_t;
using std::in_place;

#else

struct in_place_t
{
  explicit in_place_t() = default;
};

constexpr in_place_t in_place{};

#endif
}