filesystem.hpp

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// test for c++17 which has its own filesystem header
#if __cplusplus == 201703L
#if defined(__GNUC__) && (defined(__MINGW32__) || defined(__MINGW64__))
#if !(defined(USE_BOOST) || defined(USE_CSTD_FILESYSTEM))
#if (__GNUC__ == 8)
#error gcc v8.1 does not currently support <filesystem> header  windows (BUG) use <boost/filesystem.hpp>. Alternatively force use of the header by adding flag "-DUSE_CSTD_FILESYSTEM" to your compile command.
#elif (__GNUC__ == 7)
#define USE_CSTD_FILESYSTEM_EXPERIMENTAL
#else
// Not even sure we can get there
#error gcc <= v6 does not  support <filesystem> header: an addition of c++17. Please install and use boost <boost/filesystem.hpp>.
#endif
#endif
#else
#define USE_CSTD_FILESYSTEM
#endif
#endif
#ifdef USE_CSTD_FILESYSTEM
#include <filesystem>
#elif defined(USE_CSTD_FILESYSTEM_EXPERIMENTAL)
#include <experimental/filesystem>
#else
// else use boost
#include <boost/filesystem.hpp>
#endif
 
#ifdef USE_CSTD_FILESYSTEM
namespace filesystem = std::filesystem;
#else
// else use boost
namespace filesystem = boost::filesystem;
#endif