On Tue, Jul 26, 2011 at 9:12 AM, bearophile
<bearophileHUGS@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