function pointer bug?

[Andrei Alexandrescu via Digitalmars-d]

On 10/27/14 4:52 PM, bitwise wrote:
>>> quotes self
>
> Here is a better example, showing that virtual function pointers are
> available at compile time in C++. Essentially, I would expect my D code
> to function similarly, but it won't compile.
>
> class TestAddr {
>      public: virtual void test() { cout << "test" << endl; }
> };
>
> template<void (TestAddr::*FN)()>
> class PtrWrapper
> {
> public:
>      void invoke(TestAddr *instance) { (instance->*FN)(); }
> };
>
> int main(int argc, const char * argv[])
> {
>      TestAddr test;
>      PtrWrapper<&TestAddr::test> wrapper;
>      wrapper.invoke(&test);
>      return 0;
> }

That won't work in D because in D pointers to methods carry "this" with 
them, whereas in C++ they don't. -- Andrei