file-writer? ( object -- ? )

Vocabulary

io.files

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the file-writer class.

Definition

USING: classes.tuple.private io.ports io.streams.c kernel
math.private slots.private ;

IN: io.files

: file-writer? ( object -- ? )
    dup tuple? [
        layout-of
        dup
        dup
        1
        slot
        15
        fixnum>=
        [ 15 slot \ output-port eq? ]
        [ drop f ]
        if
        [ drop t ]
        [
            dup
            1
            slot
            13
            fixnum>=
            [ 13 slot \ c-writer eq? ]
            [ drop f ]
            if
        ]
        if
    ] [ drop f ] if ;