operator overloading compilation error

[Diego Canuhé]

thanks!

On Tue, Jul 26, 2011 at 9:12 AM, bearophile <bearophileHUGS at lycos.com>wrote:

> Diego Canuhé:
>
> > I'm trying to overload the "+" and "-" operators for a struct  but I get
> > this error
> >
> > test.d(47): Error: incompatible types for ((v1) - (v2)): 'Vecf!(1u)' and
> > 'Vecf!(1u)'
> > (the line corresponds to the last assert)
>
> It's a dmd bug, and I think it's already in Bugzilla. This is workaround
> code:
>
>
> struct Vecf(uint n) {
>    float x;
>    Vecf opBinary(string op)(Vecf other) if (op == "+" || op == "-") {
>        mixin("return Vecf(this.x " ~ op ~ " other.x);");
>    }
> }
>
> void main() {
>    alias Vecf!1 V;
>    auto v1 = V(3f);
>    auto v2 = V(5f);
>    auto r = V(-2f);
>    assert ((v1.opBinary!"-"(v2)) == r); // better to use an approximate ==
>    assert ((v1 - v2) == r); // better to use an approximate ==
> }
>
> Bye,
> bearophile
>
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