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67 lines
2.4 KiB
C++
67 lines
2.4 KiB
C++
//this file checks in order to ensure that right version of std::filesystem is returned for the version of c++
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// We haven't checked which filesystem to include yet
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#ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
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// Check for feature test macro for <filesystem>
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# if defined(__cpp_lib_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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// We can't check if headers exist...
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// Let's assume experimental to be safe
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# elif !defined(__has_include)
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# define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
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// Check if the header "<filesystem>" exists
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# elif __has_include(<filesystem>)
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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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// Check for enabled C++17 support
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# if defined(_HAS_CXX17) && _HAS_CXX17
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// We're using C++17, so let's use the normal version
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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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// Not on Visual Studio. Let's use the normal version
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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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// Check if the header "<filesystem>" exists
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# elif __has_include(<experimental/filesystem>)
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# define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
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// Fail if neither header is available with a nice error message
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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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// We priously determined that we need the experimental version
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# if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
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// Include it
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# include <experimental/filesystem>
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// We need the alias from std::experimental::filesystem to std::filesystem
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namespace std {
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namespace filesystem = experimental::filesystem;
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}
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# else // We have a decent compiler and can use the normal version
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# include <filesystem>// Include it
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# endif
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#endif // #ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
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