On Fri, 2010-12-03 at 15:38 -0800, Anatol Pomozov wrote:
> Hi,
>
> I have a class that contains a field and method with the same name,
> and Valac does not like it. What is the reason? Other languages
> (C#/Java) allow it. You have to use () for method so you know whether
> you access method or field.
I'm not a C# or Java programmer, so feel free to correct me if I'm wrong
but...
Java doesn't have delegates. In this example, what is X?
public class Foo {
public boolean stop = true;
public boolean stop () {
return true;
}
public Foo () {
var X = this.stop;
}
}
Actually, now that I think about it, I don't think Java does type
inferencing either.
In addition to type inferencing issues, this could cause problems with
generics, and would generally be a pain to read.
C# doesn't allow this either. AFAIK, in C# you can overload methods so
that the most appropriate method is called, but you can't have a method
and a property with the same name. Example:
class Foo {
bool stop () {
return true;
}
// No problem
bool stop (bool a) {
return false;
}
// Problem
bool stop = false;
public static void Main () {
var foo = new Foo ();
}
}
Overloading methods is a separate issue, which Aleksander Wabik already
explained.
> anatol:vala $ valac a.vala
> a.vala:4.3-4.21: error: `Foo' already contains a definition for `stop'
> public boolean stop() {
> ^^^^^^^^^^^^^^^^^^^
> a.vala:2.3-2.21: note: previous definition of `stop' was here
> public boolean stop = true;
> ^^^^^^^^^^^^^^^^^^^
> Compilation failed: 1 error(s), 0 warning(s)
Amusingly, this is basically the same error message as you get in C# (at
least from mcs):
test.cs(12,8): error CS0102: The type `Foo' already contains a
definition for `stop'
test.cs(2,8): (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings
-Evan
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