31 Input/output library [input.output]

31.12 File systems [filesystems]

31.12.8 Enumerations [fs.enum]

31.12.8.2 Enum class file_type [fs.enum.file.type]

This enum class specifies constants used to identify file types, with the meanings listed in Table 131 .

The values of the constants are distinct.

Table 131: Enum class file_type [tab:fs.enum.file.type]

🔗	Constant	Meaning
🔗	none	The type of the file has not been determined or an error occurred while trying to determine the type.
🔗	not_found	Pseudo-type indicating the file was not found. [Note 1: The file not being found is not considered an error while determining the type of a file. — end note]
🔗	regular	Regular file
🔗	directory	Directory file
🔗	symlink	Symbolic link file
🔗	block	Block special file
🔗	character	Character special file
🔗	fifo	FIFO or pipe file
🔗	socket	Socket file
🔗	implementation-defined	Implementations that support file systems having file types in addition to the above file_type types shall supply implementation-defined file_type constants to separately identify each of those additional file types
🔗	unknown	The file exists but the type cannot be determined