How to check if a class has a specific overload for member x?

[Hipreme]

On Sunday, 31 July 2022 at 19:25:51 UTC, Hipreme wrote:
> I wish to generate some functions using mixin template and I 
> wish to check if the current class already has an specific 
> overload with parameters (A, B).
>
> What I'm currently trying is doing `__traits(getOverloads, T, 
> "foo")`, and then checking if its type are equal. But it seems 
> hackish, and I would like to make something like 
> `hasOverload!(Test, "foo", int(int a, int b) const)` or 
> something like that.


Seems that is how it should be checked:

     ```d
     enum hasOverload(T, string member, FuncType)()
     {
         bool ret;
         static foreach(overload; __traits(getVirtualMethods, T, 
member))
             if(is(typeof(overload) == FuncType) && 
!__traits(isAbstractFunction, overload))
                 ret = true;
         return ret;
     }
     ```