mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-26 06:38:06 +11:00
17 lines
537 B
Plaintext
17 lines
537 B
Plaintext
|
Chained comparisons
|
||
|
|
|
||
|
|
The unit "cmp.fs" contains words to facilitate chained
|
||
|
|
comparisons with a single reference number. This allows, for
|
||
|
|
example, to easily express "a == b or a == c" or "a > b and a <
|
||
|
|
c".
|
||
|
|
|
||
|
|
The way those chained comparison words work is that, unlike
|
||
|
|
single comparison operators, they don't have a "n1 n2 -- f"
|
||
|
|
signature, but rather a "n1 f n2 -- n1 f" signature. That is,
|
||
|
|
each operator "carries over" the reference number in addition
|
||
|
|
to the latest flag.
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
(cont.)
|