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ANSI Common Lisp  21 Streams 21.2 Dictionary of Streams
| 21.2.11 open-stream-p |
Function |
- Syntax:
-
open-stream-p
stream
 generalized-boolean
- Arguments and Values:
-
stream - a stream.
generalized-boolean - a generalized boolean.
- Description:
-
Returns true if stream is an open stream; otherwise, returns false.
Streams are open until they have been explicitly closed with close,
or until they are implicitly closed due to exit from a
with-output-to-string,
with-open-file,
with-input-from-string, or
with-open-stream form.
- Examples:
-
(open-stream-p *standard-input*) true
- Affected By:
-
close.
- Exceptional Situations:
-
Should signal an error of type type-error if stream is not a stream.
- Allegro CL Implementation Details:
-
None.
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