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65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
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//===========================================================================//
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//
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// Purpose: Switch between experimental/finished 'standard' headers.
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//
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// $NoKeywords: $
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//===========================================================================//
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#ifndef EXPERIMENTAL_H
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#define EXPERIMENTAL_H
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///////////////////////////////////////////////////////////////////////////////
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// FILESYSTEM
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///////////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
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# if defined(__cpp_lib_filesystem) // Check for feature test macro for <filesystem>.
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# define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
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// Check for feature test macro for <experimental/filesystem>.
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# elif defined(__cpp_lib_experimental_filesystem)
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# define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
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# elif !defined(__has_include) // We can't check if headers exist (assuming experimental to be safe).
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# define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
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# elif __has_include(<filesystem>) // Check if the header "<filesystem>" exists.
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// If we're compiling on Visual Studio and are not compiling with C++17, we need to use experimental.
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# ifdef _MSC_VER
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// Check and include header that defines "_HAS_CXX17".
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# if __has_include(<yvals_core.h>)
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# include <yvals_core.h>
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# if defined(_HAS_CXX17) && _HAS_CXX17
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# define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
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# endif
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# endif
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// If the marco isn't defined yet, that means any of the other VS specific checks failed, so we need to use experimental.
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# ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
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# define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
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# endif
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# else // #ifdef _MSC_VER
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# define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
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# endif
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# elif __has_include(<experimental/filesystem>)
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# define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
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# else
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# error Could not find system header "<filesystem>" or "<experimental/filesystem>"
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# endif
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# if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
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# include <experimental/filesystem>
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namespace fs = std::experimental::filesystem;
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# else // We have a recent compiler and can use the finished version.
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// Include it
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# include <filesystem>
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namespace fs = std::filesystem;
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# endif
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#endif// !INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
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#endif // EXPERIMENTAL_H
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