initial-value* ( class -- object ? )

Vocabulary

slots

Inputs

class

an object

Outputs

object	an object
?	an object

Definition

IN: slots

GENERIC: initial-value* ( class -- object ? )

Methods

USING: accessors assocs classes classes.algebra
classes.algebra.private combinators kernel sequences slots ;

M: anonymous-intersection initial-value*
    {
        { [ f over instance? ] [ drop f t ] }
        { [ 0 over instance? ] [ drop 0 t ] }
        [
            [ ] [
                participants>> sort-classes
                [ initial-value ] map>alist
            ] [ ] tri [ [ first2 nip ] dip instance? ] curry
            find swap [ nip second t ] [ 2drop f f ] if
        ]
    } cond ;


USING: accessors assocs classes classes.algebra
classes.algebra.private combinators kernel sequences slots ;

M: anonymous-union initial-value*
    {
        { [ f over instance? ] [ drop f t ] }
        { [ 0 over instance? ] [ drop 0 t ] }
        [
            members>> sort-classes [ initial-value ] map>alist
            ?last [ second t ] [ f f ] if*
        ]
    } cond ;


USING: classes kernel slots ;

M: class initial-value* drop f f ;


USING: classes.maybe kernel slots ;

M: maybe initial-value* drop f t ;


USING: classes.singleton slots ;

M: singleton-class initial-value* t ;


USING: classes.struct slots ;

M: struct-class initial-value* <struct> t ; inline


USING: classes.tuple kernel slots ;

M: tuple-class initial-value* new t ;


USING: classes sequences slots variants ;

M: variant-class initial-value*
    class-members [ f f ] [ first initial-value* ] if-empty ;