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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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