Get specific functions of unknown type at runtime?

[Jacob Carlborg]

On 2012-12-17 08:54, F i L wrote:
> @Adam D. Ruppe
>
> Damn, I was afraid you where going to say to do something like that. It
> doesn't really work for what I'm thinking about, but thanks for
> confirming that my original code can't work.
>
> I have an alternative in mind, but first, is there a possible way for a
> Super class to ask about a derivative's members during constructions?
> (I'm guessing not). Something like:
>
>      import std.stdio, std.traits;
>
>      class A
>      {
>          this() {
>              alias typeof(this) type;
>              static if (hasMember!(type, "foo")) {
>                  auto top = cast(type) this;
>                  top.foo();
>              }
>          }
>      }
>
>      class B : A
>      {
>          void foo() { writeln("foobar"); }
>      }
>
>      void main() {
>          auto b = new B(); // prints: 'foobar'
>      }
>
> I assume there's no way (I can't get it to work), but I've heard odd
> things about 'typeof(this)' before, I just can't remember exactly what,
> so I figure it's worth asking about.
>
> If not, I have an alternative way to accomplish what I want. It's just
> not as ideal. I really wish D has partial classes, that would be awesome.

Don't know if this is what you need, but you could talk a look at:

http://flectioned.kuehne.cn/

It's basically runtime reflection implemented by inspecting the symbol 
table in the currently running executable. Note that this is old D1 code.

-- 
/Jacob Carlborg