On Sunday, September 25, 2011 00:23:18 Andrej Mitrovic wrote:
> import std.typetuple;
> import std.typecons;
> 
> struct Foo
> {
>     void test(int x, double y) { }
> 
>     void opOpAssign(string op, T...)(T t)
>         if (op == "~")
>     {
>         test(t);
>     }
> }
> 
> void main()
> {
>     Foo foo;
>     foo.opOpAssign!"~"(4, 5.0);  // ok
>     foo ~= tuple(4, 5.0);  // fail
> }
> 
> If I understand this correctly in the first call T becomes a D language tuple, while in the second one it's a phobos library tuple. I really hate this distinction and would love these two to be merged so the second call could compile.

They're completely different. The problem isn't that they're not the same. The problem is that TypeTuple even has a similar name.

> Is it possible to expand the phobos tuple in the call to test()? I can use the isTuple template in a `static if` to figure out if it needs expansion, so all that's left is to actually expand the phobos tuple.

expand might work, but I haven't tried it, so I don't know exactly what it does. I question that it'll work, but it might.

- Jonathan m Davis