returns true if the file is a directory
None
None
| std::stat | retrieves status information about the specified file |
| std::fstat | retrieves status information about the file described by the specified file descriptor |
| std::access_time_of | timestamp of last file access |
| std::modification_time_of | timestamp of last file modification |
| std::status_change_time_of | timestamp of last file status change |
| std_types::stat | returns true if the file is a directory |