deque? ( object -- ? )

Vocabulary

deques

Inputs and outputs

object	an object
?	a boolean

Word description

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

Definition

USING: classes.tuple.private dlists kernel search-deques
slots.private unrolled-lists ;

IN: deques

: deque? ( object -- ? )
    dup tuple? [
        layout-of
        7
        slot
        dup
        \ unrolled-list
        eq?
        [ drop t ]
        [ dup \ dlist eq? [ drop t ] [ \ search-deque eq? ] if ]
        if
    ] [ drop f ] if ;