Ter, 2008-09-16 às 18:04 +0200, TSa escreveu: > I think that mutating methods of immutable value types just have > to modify the identity. The problem is how that relates to references. > Take e.g. the Str type
I really think we are looking at this problem from the wrong perspective. For an Object to be a value, it means that if you build an object with the same "value", it will be seen as the same "value" that some other object with this value. A sane requirement for this to happen is that "value" objects are read-only, which is something pretty straight-forward. The thing is that, for a "value" object, there isn't any difference in saying: my $a := 3; or my $a := 3.clone(); Because the number '3' is a value, and you usually doesn't expect a value to change its value at a distance, that's why Int is Immutable. daniel
