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column? ( object -- ? )
Vocabulary
columns
Inputs and outputs
object
an
object
?
a boolean
Word description
Tests if the object is an instance of the
column
class.
Definition
USING:
classes.tuple.private
kernel
slots.private
;
IN:
columns
:
column?
( object -- ? )
dup
tuple?
[
layout-of
7
slot
\
column
eq?
]
[
drop
f
]
if
;