alias Callback = extern(C) int function(const(void)* a, void* b, uint c, void* context);

​

class C

{

    int field = 43;

    extern(C) int foo(void* b, uint c, C this_)     

    {        

        //writeln(a, " ", b, " ", c, " ", this_.field);

        return 0;

    }

    extern(C) static int bar(void* a, void* b, uint c, void* context)     

    {        

        //writeln(a, " ", b, " ", c, " ", this_.field);

        return 0;

    }

​

}

​

void main()

{

    void* a = new int;

    void* b = new int;

    uint c = 42;

    auto obj = new C;

    Callback cb = cast(Callback) (&obj.foo).funcptr;

    cb(a, b, c, cast(void*) obj);

    //writeln(a, " ", b, " ", c, " ", obj.field);

        /* For comparison. Should print the same. */

}