question about property for built-in type

[Stanislav Blinov]

  08.10.2010 16:19, %u wrote:
> Hi,
> I'm learning D right now and got a question about property.
> I tried to add a property for built-in type like the following
>
> @property bool equalZero(double a) { return a == 0.0; }
>
> void main()
> {
>    ...
>    double x = 4.4;
>    bool isXZero = x.equalZero;
>    ...
> }
>
> but got an error message
> main.d(75): Error: no property 'equalZero' for type 'double'
>
> I tried similar thing with int[] and it works.
> Is that I did something wrong or property does not support built-in type like
> double, int, real, ...?
>
> Appreciate for your time and answer.
>

What you're trying to do is utilize uniform function call syntax (foo(T) 
=== T.foo()), but that is currently supported *only* for arrays. AFAIK 
it's going to be implemented at some point, but right now you will have 
to use equalZero(a) instead of a.equalZero.