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c688b401d3
Provide a standardized way to handle the C++ "standard" headers
customized to be used with current CMake C++ standard constraints.
Offer under directory `cm` headers which can be used as direct
replacements of the standard ones. For example:
#include <cm/string_view>
can be used safely for CMake development in place of the `<string_view>`
standard header.
Fixes: #19491
35 lines
599 B
C++
35 lines
599 B
C++
// -*-c++-*-
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// vim: set ft=cpp:
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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#ifndef cm_utility
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#define cm_utility
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#if __cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
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# define CMake_HAVE_CXX_IN_PLACE
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#endif
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#include <utility> // IWYU pragma: export
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namespace cm {
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#if defined(CMake_HAVE_CXX_IN_PLACE)
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using std::in_place_t;
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using std::in_place;
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#else
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struct in_place_t
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{
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explicit in_place_t() = default;
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};
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constexpr in_place_t in_place{};
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#endif
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}
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#endif
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