Vocabulary
io

Inputs and outputs

stream	a stream
?	a boolean

Word description
Returns true if stream is a seekable stream.

Notes
Stream seeking is not supported on streams that do not have a known length, e.g. TCP/IP streams.

See also
stream-seek, stream-tell, stream-length

Definition

IN: io

GENERIC: stream-seekable? ( stream -- ? )

Methods

USING: accessors io io.ports ;

M: buffered-port stream-seekable? handle>> can-seek-handle? ;

USING: io io.streams.byte-array kernel ;

M: byte-reader stream-seekable? drop t ; inline

USING: io kernel ;

M: input-stream stream-seekable? drop f ; inline

USING: accessors io io.streams.limited ;

M: limited-stream stream-seekable?
stream>> stream-seekable? ; inline

USING: io kernel ;

M: output-stream stream-seekable? drop f ; inline

USING: io io.streams.string kernel ;

M: string-reader stream-seekable? drop t ; inline

USING: accessors io io.streams.throwing ;

M: throws-on-eof-stream stream-seekable?
stream>> stream-seekable? ;