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- #ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
- # if defined(__cpp_lib_filesystem)
- # define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
- # elif defined(__cpp_lib_experimental_filesystem)
- # define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
- # elif !defined(__has_include)
- # define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
- # elif __has_include(<filesystem>)
- # ifdef _MSC_VER
- # if __has_include(<yvals_core.h>)
- # include <yvals_core.h>
- # if defined(_HAS_CXX17) && _HAS_CXX17
- # define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
- # endif
- # endif
- # ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
- # define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
- # endif
- # else
- # define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
- # endif
- # elif __has_include(<experimental/filesystem>)
- # define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
- # else
- # error Could not find system header "<filesystem>" or "<experimental/filesystem>"
- # endif
- # if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
- # include <experimental/filesystem>
- namespace std {
- namespace filesystem = experimental::filesystem;
- }
- # else
- # include <filesystem>
- # endif
- #endif
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