How could I do the following?

I'm getting this error message:
test.d(15): Error: c.gimme can only be called on a mutable object

<code>
class Foo
{
	uint x;

	const (const(uint)*) gimme()
	{
		return &x;
	}
}

void main()
{
	const(Foo) c = new Foo;

	const(uint)* x = c.gimme(); // line 15
}
</code>

"Leonard Dahlmann" <leo.dahlmann@gmail.com> wrote in message news:f57tbr$p41$1@digitalmars.com...
> How could I do the following?
>
> I'm getting this error message:
> test.d(15): Error: c.gimme can only be called on a mutable object
>
> <code>
> class Foo
> {
> uint x;
>
> const (const(uint)*) gimme()
> {
> return &x;
> }
> }
>
> void main()
> {
> const(Foo) c = new Foo;
>
> const(uint)* x = c.gimme(); // line 15
> }
> </code>

Don't have the D2 compiler here, but shouldn't that be

invariant const(uint)* gimme()

?

> How could I do the following?
> 
> <code>
> class Foo
> {
> uint x;
> 
> const (const(uint)*) gimme()
> {
> return &x;
> }
> }

I think you have to remove the outermost parentheses. Probably the compiler
thinks the return type is const(const(uint)*) for a normal method and not
const(uint)* for a const method.

This works for me:

alias const(uint)* returnType;
const returnType gimme() {...}

But this fails to compile:

const const(uint)* gimme() {...}

Cheers,
Christian

Christian Kamm wrote:
> This works for me:
> 
> alias const(uint)* returnType;
> const returnType gimme() {...}
> 
> But this fails to compile:
> 
> const const(uint)* gimme() {...}
> 
> Cheers,
> Christian

You might want to file a bug for that: an alias should behave the same way as the base type. I'm not sure which behaviour is correct, but they should at least be the same.

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