?1if ( ..a x pred: ( ..a x quot: ( ..a x -- ..b ? ) -- ..b x ? ) true: ( ..b x -- ..c ) false: ( ..b x -- ..c ) -- ..c )

Vocabulary

combinators.extras

Inputs

x	an object
pred	a quotation with stack effect ( ..a x quot: ( ..a x -- ..b ? ) -- ..b x ? )
true	a quotation with stack effect ( ..b x -- ..c )
false	a quotation with stack effect ( ..b x -- ..c )

Outputs

None

Definition

USING: kernel ;

IN: combinators.extras

: ?1if
    ( ..a x pred: ( ..a x quot: ( ..a x -- ..b ? ) -- ..b x ? ) true: ( ..b x -- ..c ) false: ( ..b x -- ..c ) -- ..c )
    [ ?1guard ] 2dip if ; inline