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584 B
584 B
Boxes
A box is like a single-element vector. It can print as a quoted #&
followed by the printed form of the boxed value. A #& form can also be
used as an expression, but since the resulting box is constant, it has
practically no use.
Examples:
> (define b (box "apple"))
> b
'#&"apple"
> (unbox b)
"apple"
> (set-box! b '(banana boat))
> b
'#&(banana boat)
+[missing] in [missing] provides more on boxes and box procedures.