cyclone/docs/api/srfi/111.md

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SRFI 111 - Boxes

The (srfi 111) library defines boxes, a container for an object of any Scheme type, including another box. Boxes are normally used as minimal mutable storage, and can inject a controlled amount of mutability into an otherwise immutable data structure (or one that is conventionally treated as immutable).

See the SRFI document for more information.

• [box] (#box)
• [box?] (#box-1)
• [unbox] (#unbox)
• set-box!

#box (box value) Constructor. Returns a newly allocated box initialized to value. #box? (box? object) Predicate. Returns #t if object is a box, and #f otherwise. #unbox (unbox box) Accessor. Returns the current value of box. #set-box! (set-box! box value) Mutator. Changes box to hold value.