Deduplicating template reflection code

[Johannes Pfau via Digitalmars-d-learn]

Am Fri, 14 Apr 2017 08:55:48 +0000
schrieb Moritz Maxeiner <moritz at ucworks.org>:

> 
> mixin Foo!(API, (MethodType) {
> // function dependent code here
> });
> foo();
> ---
> 
> Option 2: Code generation using CTFE
> 
> ---
> string genFoo(alias API, string justDoIt)
> {
>      import std.array : appender;
>      auto code = appender!string;
>      code.put(`[...]1`);
>      code.put(`foreach (MethodType; overloads) {`);
>      code.put(justDoIt);
>      code put(`}`);
>      code.put(`[...]2`);
> }
> 
> mixin(genFoo!(API, q{
>      // function dependent code here
> })());
> ---
> 
> Personally, I'd consider the second approach to be idiomatic, but 
> YMMW.

I'd prefer the first approach, simply to avoid string mixins. I think
these can often get ugly ;-)

Is there some way to wrap the 'type selection'? In pseudo-code something
like this:

enum FilteredOverloads(API) = ...

foreach(Overload, FilteredOverloads!API)
{
    ....
}
-- Johannes