cpp/experimental/fs/is fifo

Checks if the given file status or path corresponds to a FIFO or pipe file.

@1@ Equivalent to.

@2@ Equivalent to.

@3@ Equivalent to. Returns and sets  to an appropriate error code if an error occurs. Otherwise, is cleared with a call to.

Return value
if the given path or file status corresponds to a FIFO file.

Exceptions
@1,3@

@2@ Throws if an error occurs. The exception object is constructed with as an argument.