30.3. General generic functions

General generic functions defined on streams

(STREAM-ELEMENT-TYPE stream)

Returns the stream's element type, normally a subtype of CHARACTER or INTEGER.

The method for GRAY:FUNDAMENTAL-CHARACTER-STREAM returns CHARACTER.

((SETF STREAM-ELEMENT-TYPE) new-element-type stream)

Changes the stream's element type.

The default method SIGNALs an ERROR.

This function is a CLISP extension (see Section 21.8, “Function STREAM-ELEMENT-TYPE).

(CLOSE stream &KEY :ABORT)

Closes the stream and flushes any associated buffers.

When you define a primary method on this function, do not forget to CALL-NEXT-METHOD.

(OPEN-STREAM-P stream)

Returns true before the stream has been closed, and NIL after the stream has been closed.

You do not need to add methods to this function.

(GRAY:STREAM-POSITION stream position)

Just like FILE-POSITION, but NIL position means inquire.

You must define a method for this function.

(GRAY:STREAM-READ-SEQUENCE sequence stream &KEY :START :END)

Used by READ-SEQUENCE. Deprecated. Define GRAY:STREAM-READ-CHAR-SEQUENCE or GRAY:STREAM-READ-BYTE-SEQUENCE and call EXT:READ-CHAR-SEQUENCE/EXT:READ-BYTE-SEQUENCE instead.

The default method calls GRAY:STREAM-READ-CHAR-SEQUENCE or GRAY:STREAM-READ-BYTE-SEQUENCE.

(GRAY:STREAM-WRITE-SEQUENCE sequence stream &KEY :START :END)

Used by WRITE-SEQUENCE. Deprecated. Define GRAY:STREAM-WRITE-CHAR-SEQUENCE or GRAY:STREAM-WRITE-BYTE-SEQUENCE and call EXT:WRITE-CHAR-SEQUENCE/EXT:WRITE-BYTE-SEQUENCE instead.

The default method calls GRAY:STREAM-WRITE-CHAR-SEQUENCE or GRAY:STREAM-WRITE-BYTE-SEQUENCE.


These notes document CLISP version 2.49+Last modified: 2016-09-05