let*-values -- r7rs Definition
§

Kind
§

syntax;

Implemented by
§

Syntax signature
§

Syntax keywords:

Syntax variants:

Exports
§

Exports recursive
§

Description
§

(let*-values <mv-binding-spec> <body>)

Syntax: <Mv-binding-spec> has the form

((<formals> <init>) ...)

and <body> is a sequence of zero or more definitions followed by one or more expressions as described in section lambda. In each <formals>, it is an error if any variable appears more than once.

Semantics: The let*-values construct is similar to let-values, but the <init>s are evaluated and bindings created sequentially from left to right, with the region of the bindings of each <formals> including the <init>s to its right as well as <body>. Thus the second <init> is evaluated in an environment in which the first set of bindings is visible and initialized, and so on.

(let ((a 'a) (b 'b) (x 'x) (y 'y))
  (let*-values (((a b) (values x y))
                ((x y) (values a b)))
    (list a b x y)))     ===> (x y x y)

The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.

Goto: library, categories, exports, definitions, types, appendices, other libraries.