filesystem.hpp

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#pragma once
 
#include <h5cpp/core/with_boost.hpp>
 
#ifdef H5CPP_WITH_BOOST
#include <boost/filesystem.hpp>
namespace fs = boost::filesystem;
#else
 
// Check for feature test macro for <filesystem>
#if defined(__cpp_lib_filesystem)
#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
 
// Check for feature test macro for <experimental/filesystem>
#elif defined(__cpp_lib_experimental_filesystem)
#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
 
// Can't check if headers exist so assume experimental to be safe
#elif !defined(__has_include)
#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
 
// Check if the header "<filesystem>" exists
#elif __has_include(<filesystem>)
 
// If we're compiling on Visual Studio and are not compiling with C++17, we need
// to use experimental
#ifdef _MSC_VER
 
// Check and include header that defines "_HAS_CXX17"
#if __has_include(<yvals_core.h>)
#include <yvals_core.h>
 
// Check for enabled C++17 support
#if defined(_HAS_CXX17) && _HAS_CXX17
// We're using C++17, so let's use the normal version
#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
#endif
#endif
 
// If the marco isn't defined yet, that means any of the other VS specific
// checks failed, so we need to use experimental
#ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
#endif
 
// Not on Visual Studio. Let's use the normal version
#else // #ifdef _MSC_VER
#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
#endif
 
// Check if the header "<filesystem>" exists
#elif __has_include(<experimental/filesystem>)
#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
 
// Fail if neither header is available with a nice error message
#else
#error Could not find system header "<filesystem>" or "<experimental/filesystem>"
#endif
 
// We previously determined that we need the experimental version
#if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
// Include it
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
 
// We have a decent compiler and can use the normal version
#else
// Include it
#include <filesystem>
namespace fs = std::filesystem;
#endif
 
#endif