Re: Class References

[Jared Miller]

On Monday, 28 October 2013 at 11:22:03 UTC, Jeroen Bollen wrote:
Is it possible in D to create an enum of class references?
Something around the lines of:
enum ClassReferences : Interface {
    CLASS1 = &ClassOne,
    CLASS2 = &ClassTwo
}

Here's my solution using an enum as you originally wanted. 
However, depending on what you're really trying to do, there 
could be a better way.

import std.stdio;
import std.traits : fullyQualifiedName;

interface Foo { void bar(); }

class Class1 : Foo {
        void bar() { writeln("Class1"); }
}

class Class2 : Foo {
        void bar() { writeln("Class2"); }
}

enum ClassNames : string {
        CLASS1 = fullyQualifiedName!Class1,
        CLASS2 = fullyQualifiedName!Class2
}

Foo getObj(ClassNames name) {
        // without cast, it converts to the enum member name.
        return cast(Foo)Object.factory(cast(string)name);
}

void main() {
        auto c1 = getObj(ClassNames.CLASS1);
        auto c2 = getObj(ClassNames.CLASS2);
        assert(c1 && c2);
        c1.bar();
        c2.bar();
}