[Pkg] The Trunk: Kernel-nice.628.mcz
commits at source.squeak.org
commits at source.squeak.org
Mon Sep 26 19:11:04 UTC 2011
Nicolas Cellier uploaded a new version of Kernel to project The Trunk:
http://source.squeak.org/trunk/Kernel-nice.628.mcz
==================== Summary ====================
Name: Kernel-nice.628
Author: nice
Time: 26 September 2011, 9:10:09.363 pm
UUID: 9c77ee63-103f-4577-b987-5ee0f539d582
Ancestors: Kernel-nice.627
Boolean subclasses know better how to behave, so if we delegate ==> , we can implement a branch-less implication.
Though I wonder if this is really an optimization in case of a JIT VM...
{
[true ==> [1 > 2]] bench.
[false ==> [1 > 2]] bench.
}
#( '6,440,000 per second.' '6,690,000 per second.') "BEFORE"
#( '6,410,000 per second.' '7,030,000 per second.') "AFTER"
=============== Diff against Kernel-nice.627 ===============
Item was added:
+ ----- Method: Boolean>>===> (in category 'logical operations') -----
+ ===> aBlock
+ "this is material implication, a ==> b, also known as:
+ b if a
+ a implies b
+ if a then b
+ b is a consequence of a
+ a therefore b (but note: 'it is raining therefore it is cloudy' is implication; 'it is autumn therefore the leaves are falling' is equivalence).
+
+ Here is the truth table for material implication (view in a monospaced font):
+
+ p | q | p ==> q
+ -------|-------|-------------
+ T | T | T
+ T | F | F
+ F | T | T
+ F | F | T
+ "
+
+ ^self not or: [aBlock value]!
Item was changed:
----- Method: Boolean>>==> (in category 'logical operations') -----
==> aBlock
"this is material implication, a ==> b, also known as:
b if a
a implies b
if a then b
b is a consequence of a
a therefore b (but note: 'it is raining therefore it is cloudy' is implication; 'it is autumn therefore the leaves are falling' is equivalence).
Here is the truth table for material implication (view in a monospaced font):
p | q | p ==> q
-------|-------|-------------
T | T | T
T | F | F
F | T | T
F | F | T
"
+ self subclassResponsibility!
- ^self not or: [aBlock value]!
Item was added:
+ ----- Method: False>>==> (in category 'logical operations') -----
+ ==> aBlock
+ ^true!
Item was added:
+ ----- Method: True>>==> (in category 'logical operations') -----
+ ==> aBlock
+ ^aBlock value!
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