Appendix F Common Lisp Streams

F.2 Basic Stream Functions

These generic functions must be defined for all stream classes.

stream-element-type [Generic Function]

Arguments:
stream
Summary:
This existing Common Lisp function is made generic, but otherwise behaves the same. Class fundamental-character-stream provides a default method that returns character.

open-stream-p [Generic Function]
Arguments:
stream
Summary:
This function is made generic. A default method is provided by class fundamental-stream that returns t if close has not been called on the stream.

close [Generic Function]
Arguments:
stream&key abort
Summary:
The existing Common Lisp function close is redefined to be a generic function, but otherwise it behaves the same. The default method provided by the class fundamental-stream sets a flag used by open-stream-p. The value returned by close will be as specified by the X3J13 issue closed-stream-operations.

stream-pathname [Generic Function]
Arguments:
stream
stream-truename [Generic Function]
Arguments:
stream
Summary:
These are used to implement pathname and truename. There is no default method because these are not valid for all streams.


CLIM 2.0 User's Guide - OCT 1998

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