8bool exists(
const std::string& filename );
11size_t timestamp(
const std::string& filename );
19std::string pathname(
const std::string& filename );
22std::string normalize_filename(
const std::string& filename );
28std::string relative_filename(
const std::string& filename,
const std::string& path );
30std::string absolute_filename(
const std::string& path,
const std::string& filename );