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| author | Kyle Edwards <kyle.edwards@kitware.com> | 2019-08-02 20:52:19 (GMT) |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2019-08-23 12:43:35 (GMT) |
| commit | 197c5e12adea2b7d72cf8bfa17e961b9428f5d57 (patch) | |
| tree | 327b5c4d8a376a2712c9a5e11d7b5fc1c06ef63a /Source/cm_utility.hxx | |
| parent | 170fcd715f586cfd6b9f741c0572d472e0abe8ed (diff) | |
| download | CMake-197c5e12adea2b7d72cf8bfa17e961b9428f5d57.zip CMake-197c5e12adea2b7d72cf8bfa17e961b9428f5d57.tar.gz CMake-197c5e12adea2b7d72cf8bfa17e961b9428f5d57.tar.bz2 | |
Source: Add cm::optional
Diffstat (limited to 'Source/cm_utility.hxx')
| -rw-r--r-- | Source/cm_utility.hxx | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/Source/cm_utility.hxx b/Source/cm_utility.hxx new file mode 100644 index 0000000..99d7f8b --- /dev/null +++ b/Source/cm_utility.hxx @@ -0,0 +1,35 @@ +/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying + file Copyright.txt or https://cmake.org/licensing for details. */ +#ifndef cm_utility_hxx +#define cm_utility_hxx + +#include "cmConfigure.h" // IWYU pragma: keep + +#if __cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L) +# define CMake_HAVE_CXX_IN_PLACE +#endif + +#if defined(CMake_HAVE_CXX_IN_PLACE) +# include <utility> +#endif + +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 +} + +#endif |