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write-sequence (Function)

— Function: write-sequence sequence stream &key start end sequence

sequence—a sequence.

stream—an output stream.

start, endbounding index designators of sequence. The defaults for start and end are 0 and nil, respectively.


write-sequence writes the elements of the subsequence of sequence bounded by start and end to stream.

 (write-sequence "bookworms" *standard-output* :end 4)
 ▷ book
Side Effects:

Modifies stream.

Exceptional Situations:

Should be prepared to signal an error of type type-error if sequence is not a proper sequence. Should signal an error of type type-error if start is not a non-negative integer. Should signal an error of type type-error if end is not a non-negative integer or nil.

Might signal an error of type type-error if an element of the bounded sequence is not a member of the stream element type of the stream.

See Also:

Section 3.2.1 (Compiler Terminology), read-sequence, write-string, write-line


write-sequence is identical in effect to iterating over the indicated subsequence and writing one element at a time to stream, but may be more efficient than the equivalent loop. An efficient implementation is more likely to exist for the case where the sequence is a vector with the same element type as the stream.