The Trunk: Collections-ul.259.mcz

Levente Uzonyi uploaded a new version of Collections to project The Trunk:
http://source.squeak.org/trunk/Collections-ul.259.mcz

==================== Summary ====================

Name: Collections-ul.259
Author: ul
Time: 22 December 2009, 7:44:15 am
UUID: a72038cf-e6a6-9a41-ae33-4a060f20af91
Ancestors: Collections-ar.256, Collections-nice.256

- merged Collections-nice.256

=============== Diff against Collections-ar.256 ===============

Item was changed:
  ----- Method: Interval>>reverseDo: (in category 'enumerating') -----
  reverseDo: aBlock
+ "Evaluate aBlock for each element of my interval, in reverse order.
+ Implementation notes: see do: for an explanation on loop detail"
+
+ | aValue index |
+ index := self size.
+ [index > 0]
+ whileTrue: [
+ index := index - 1.
+ aValue := start + (index * step).
+ aBlock value: aValue]!
- "Evaluate aBlock for each element of my interval, in reverse order."
- | aValue |
- aValue := self last.
- step < 0
- ifTrue: [[start >= aValue]
- whileTrue: [aBlock value: aValue.
- aValue := aValue - step]]
- ifFalse: [[start <= aValue]
- whileTrue: [aBlock value: aValue.
- aValue := aValue - step]]!

Item was changed:
  ----- Method: Interval>>indexOf:startingAt:ifAbsent: (in category 'accessing') -----
  indexOf: anElement startingAt: startIndex ifAbsent: exceptionBlock
  "startIndex is an positive integer, the collection index where the search is started."
  "during the computation of val , floats are only used when the receiver contains floats"
 
  | index val |
  (self rangeIncludes: anElement)
  ifFalse: [^ exceptionBlock value].
  val := anElement - self first / self increment.
  val isFloat
  ifTrue: [(val - val rounded) abs * 100000000 < 1
  ifTrue: [index := val rounded + 1]
  ifFalse: [^ exceptionBlock value]]
  ifFalse: [val isInteger
  ifTrue: [index := val + 1]
  ifFalse: [^ exceptionBlock value]].
  "finally, the value of startIndex comes into play:"
+ ^ (index between: startIndex and: self size)
+ ifTrue: [index]
+ ifFalse: [exceptionBlock value]!
- ^ index < startIndex
- ifTrue: [exceptionBlock value]
- ifFalse: [index]!

Item was changed:
  ----- Method: Interval>>do: (in category 'enumerating') -----
+ do: aBlock
+ "Evaluate aBlock for each value of the interval.
+ Implementation note: instead of repeatedly incrementing the value
+    aValue := aValue + step.
+ until stop is reached,
+ We prefer to recompute value from start
+    aValue := start + (index * step).
+ This is better for floating points accuracy, while not degrading Integer and Fraction speed too much.
+ Moreover, this is consistent with methods #at: and #size"
+
+ | aValue index size |
+ index := 0.
+ size := self size.
+ [index < size]
+ whileTrue: [aValue := start + (index * step).
+ index := index + 1.
+ aBlock value: aValue]!
- do: aBlock
-
- | aValue |
- aValue := start.
- step < 0
- ifTrue: [[stop <= aValue]
- whileTrue:
- [aBlock value: aValue.
- aValue := aValue + step]]
- ifFalse: [[stop >= aValue]
- whileTrue:
- [aBlock value: aValue.
- aValue := aValue + step]]!