30 Input/output library [input.output]

30.11 File systems [filesystems]

30.11.9 Enumerations [fs.enum]

30.11.9.2 Enum class file_­type [fs.enum.file_type]

This enum class specifies constants used to identify file types, with the meanings listed in Table 115.
Table 115 — Enum class 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
:
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 could not be determined