How to dispatch a class function for an object accessed by handle?

Steven Schveighoffer schveiguy at
Fri Mar 6 14:42:48 UTC 2020

On 3/6/20 9:14 AM, Adam D. Ruppe wrote:
> On Friday, 6 March 2020 at 14:05:55 UTC, Steven Schveighoffer wrote:
>> Adam's way doesn't work either, because the call doesn't use the 
>> alias, but just instantiates opDispatch with the new name!'
> oh yikes, how did I not notice that?!
> so yeah just kinda screwed. I'd probably suggest at tis point having the 
> opDispatch be a trivial implementation that just forwards to another 
> named method.
> struct A {
>    template opDispatch(string name) {
>       auto opDispatch(T, Args...)(Args args) {
>             return other_name!(name, T, Args)(args);
>       }
>    }

Do this instead, I think this will work and avoids an extra call (and 
having to do the argument plumbing that inevitably comes with this kind 
of wrapping):

template opDispatch(string name) {
    alias opdispatch(T) = other_name!(name, T);

template other_name(string name, T) {
    auto other_name(Args...)(Args args) {
       // real implementation


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