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ANSI Common Lisp  21 Streams 21.2 Dictionary of Streams
| 21.2.12 stream-element-type |
Function |
- Syntax:
-
stream-element-type
stream
 typespec
- Arguments and Values:
-
stream - a stream.
typespec - a type specifier.
- Description:
-
stream-element-type returns a type specifier that
indicates the types of objects that may be read from
or written to stream.
Streams created by open have an element type
restricted to integer or a subtype of type character.
- Examples:
-
;; Note that the stream must accomodate at least the specified type,
;; but might accomodate other types. Further note that even if it does
;; accomodate exactly the specified type, the type might be specified in
;; any of several ways.
(with-open-file (s "test" :element-type '(integer 0 1)
:if-exists :error
:direction :output)
(stream-element-type s))
INTEGER
OR(UNSIGNED-BYTE 16)
OR(UNSIGNED-BYTE 8)
OR BIT
OR(UNSIGNED-BYTE 1)
OR(INTEGER 0 1)
OR(INTEGER 0 (2))
- 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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