Filter for opDispatch?

[Paul Backus]

On Friday, 14 May 2021 at 22:39:29 UTC, frame wrote:
> When using opDispatch()
>
> - how can I tell the compiler that I do not want to handle some 
> calls? Some code is testing for range methods (empty, front, 
> popFront) and I don't know where and which side effects it 
> causes.

Use a template constraint. For example:

     auto opDispatch(string method, Args...)(Args args)
         if (shouldHandle!method)
     {
         // ...
     }

...where `shouldHandle` checks the method name and returns `true` 
if you want to handle it, or `false` if you don't.

> - how can I dismiss calls from __traits(compiles)?

You can't.