| [#158] | project: specification | priority: low | category: missing feature | |
|---|---|---|---|---|
| submitter | assigned to | status | date submitted | |
| Burak | Martin | won't fix | 2003-09-30 11:30:12.0 | |
| subject | p.47 (type of null) | |||
| code |
object foo {
def main = {
//var ch:char = null.asInstanceOf[char]; this works
var ch:char = null;
}
} |
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| what happened | ||||
| what expected | it is more intuitive to C,C++,Java programmers to think of null as being of "the right type" (depending on the context).
this could be implemented in the compiler by adding the cast in an early phase, as needed. |
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| [back to overview] | ||||
| Burak edited on 2003-09-30 11:30:22.0 |
| Matthias edited on 2003-09-30 23:54:47.0 |
For Java programmers it is clear that null has type null and type null is a subtype of all reference types. In Scala, null has type scala.AllRef (which is a subtype of all subtypes of scala.AnyRef). Consequently, Scala handles null exactly like Java does! So why is it unintuitive?
If you want to initialize your variable to a default value, use the following syntax:
var ch: Char = _; |
| Martin edited on 2003-10-06 12:38:16.0 |