CLHS: Accessor SVREF

#

Accessor SVREF

Syntax:

svref simple-vector index => element

`(setf (`svref simple-vector index`)` new-element`)`

Arguments and Values:

simple-vector---a simple vector.

index---a valid array index for the simple-vector.

element, new-element---an object (whose type is a subtype of the array element type of the simple-vector).

Description:

Accesses the element of simple-vector specified by index.

Examples:

     (simple-vector-p (setq v (vector 1 2 'sirens))) =>  true
     (svref v 0) =>  1
     (svref v 2) =>  SIRENS
     (setf (svref v 1) 'newcomer) =>  NEWCOMER
     v =>  #(1 NEWCOMER SIRENS)

Side Effects: None.

Affected By: None.

Exceptional Situations: None.

See Also:

aref, sbit, schar, vector, Section 3.2.1 (Compiler Terminology)

Notes:

svref is identical to aref except that it requires its first argument to be a simple vector.

     (svref v i) ==  (aref (the simple-vector v) i)

The following X3J13 cleanup issue, not part of the specification, applies to this section:

- CONSTANT-MODIFICATION:DISALLOW

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