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stream-element-type

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 
<i><sup>or</sup>→</i> (UNSIGNED-BYTE 16) 
<i><sup>or</sup>→</i> (UNSIGNED-BYTE 8) 
<i><sup>or</sup>→</i> BIT 
<i><sup>or</sup>→</i> (UNSIGNED-BYTE 1) 
<i><sup>or</sup>→</i> (INTEGER 0 1) 
<i><sup>or</sup>→</i> (INTEGER 0 (2))

Exceptional Situations:

Should signal an error of type type-error if stream is not a stream.

Expanded Reference: stream-element-type​

tip

TODO: Please contribute to this page by adding explanations and examples

(stream-element-type )