extern void check_int_close (int a, int b, int d);
extern void check_int_close (std::pair<int, int>, std::pair<int, int>, int d);
extern boost::filesystem::path find_file (boost::filesystem::path dir, std::string filename_part);
extern void check_int_close (int a, int b, int d);
extern void check_int_close (std::pair<int, int>, std::pair<int, int>, int d);
extern boost::filesystem::path find_file (boost::filesystem::path dir, std::string filename_part);