operator overloading and templates
Steven Schveighoffer
schveiguy at yahoo.com
Wed Oct 5 05:30:43 PDT 2011
On Tue, 04 Oct 2011 12:24:52 -0400, jimmy <zsu0915 at yahoo.com.tw> wrote:
> Hi,
>
> I have the following code.
>
> struct Foo(int DIM) {
> Foo!(DIM) opBinary(string op) (Foo!(DIM) rhs)
> if (op == "+" || op == "-")
> {
> return Foo!(DIM)();
> }
> }
>
> unittest {
> auto u = Foo!(2)();
> auto v = Foo!(2)();
> assert(u + v == u);
> }
>
> I got the following during my test.
>
> Z:\proj\D\gas>rdmd --main -unittest a.d
> rdmd --main -unittest a.d
> a.d(12): Error: incompatible types for ((u) + (v)): 'Foo!(2)' and
> 'Foo!(2)'
> Failed: dmd -unittest -v -o- "a.d" -I"." >a.d.deps
>
> I have no idea why the incompatible types error occurred.
As Ali said, use Foo instead of Foo!DIM, but I think there is also a bug
for this already. I just can't find it right now...
-Steve
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