Function that returns class name in D

Question

Say, classes A1,A2,...,An all extends the abstract class B. I would like A1,...,An to have a function that returns a string of the class name. This is certainly known in compile-time, but I would like to implement this function in B, and use inheritance so that all Ai:s get this functionality.

In java, this can easily be done, by letting B have the method

String getName() {
    return this.getClass();
}

more or less. So, how do I do this in D? Also, is there a way, using traits or similar, to determine which class members are public?

Answer 1

simply typeof(this).stringof

however this is fixed at compile time so inheritance doesn't change the value

this.typeinfo.name

will give the dynamic name of the classname of the instance

http://www.d-programming-language.org/expression.html#typeidexpression
http://www.d-programming-language.org/phobos/object.html#TypeInfo_Class

Answer 2

It is known at compile-time, but evaluating the class name at runtime requires demangling, I think.

Here it is if runtime-evaluation is okay:

import std.stdio;
import std.algorithm;

abstract class B {
    string className() @property {
        return this.classinfo.name.findSplit(".")[2];
    }
}

class A1 : B { }
class A2 : B { }

void main()
{
    auto a1 = new A1();
    writeln(a1.className);

    auto a2 = new A2();
    writeln(a2.className);
}