rational? ( object -- ? )

Vocabulary

math

Inputs and outputs

object	an object
?	a boolean

Word description

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

Definition

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

IN: math

: rational? ( object -- ? )
    dup tag 1 swap fixnum-shift-fast 33 fixnum-bitand 0 eq? not
    [ drop t ] [
        dup
        tuple?
        [ layout-of 7 slot \ ratio eq? ]
        [ drop f ]
        if
    ] if ;