| [#1129] | project: api | priority: low | category: missing feature | |
|---|---|---|---|---|
| submitter | assigned to | status | date submitted | |
| Nikolay | Sean | won't fix | 2007-05-21 21:06:31.0 | |
| subject | [contrib #513] Collection classes should make it possible to define an alternative comparator | |||
| code |
(no code) |
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| what happened | I wanted to have a collection (a set to be precise) in which objects would be compared by a different notion of \ equality than the one of ==. It was not possible using the collections of the Scala library. |
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| what expected | Like Java collections, all Scala collections should offer a constructor that accepts a comparator as argument. This comparator should then be used to compare elements of the collection. | |||
| [back to overview] | ||||
| Nikolay edited on 2007-05-21 21:07:01.0 |
| Sean edited on 2007-05-21 21:56:22.0 |
| I'm not sure if we should do this. Configurable comparators only applies to ordered collections. Also, there is a handy function I just added last week: scala.Collection.equalsWith. If you want it to be the default, override equals? |
| Sean edited on 2007-07-17 18:03:31.0 |
Only sorted collections accept comparators, and these will work in Scala (e.g., new TreeSet[String]()(str => new MyCompator(str))). Use equalsWith in sequence if possible. Otherwise, Java doesn't support this, so we can't support it in the JCL.
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