permutations? ( object -- ? )

Vocabulary

math.combinatorics

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the permutations class.

Definition

USING: classes.tuple.private kernel slots.private ;

IN: math.combinatorics

: permutations? ( object -- ? )
    dup tuple?
    [ layout-of 7 slot \ permutations eq? ] [ drop f ] if ;