copy-seq (Function)

Syntax:

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

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.