Magic type return

[Andrea Fontana]

class Known
{
         void* data; // external data by c api
         int type;  // 0 for int, 1 for string, etc. ..
}

How can I implement a method like this?

Known  known;  // <-- suppose known.type == 1;
string s  = known.value(); // <-- automatic 

I just know how to do this:

string s = know.value!string(); 




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