CLHS: Function COPY-SEQ

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Function COPY-SEQ

Syntax:

copy-seq sequence => copied-sequence

Arguments and Values:

sequence---a proper sequence.

copied-sequence---a proper sequence.

Description:

Creates a copy of sequence. The elements of the new sequence are the same as the corresponding elements of the given sequence.

If sequence is a vector, the result is a fresh simple array of rank one that has the same actual array element type as sequence. If sequence is a list, the result is a fresh list.

Examples:

     (setq str "a string") =>  "a string"
     (equalp str (copy-seq str)) =>  true
     (eql str (copy-seq str)) =>  false

Side Effects: None.

Affected By: None.

Exceptional Situations:

Should be prepared to signal an error of type type-error if sequence is not a proper sequence.

See Also:

copy-list

Notes:

From a functional standpoint,

     (copy-seq x) ==  (subseq x 0)

However, the programmer intent is typically very different in these two cases.

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