C++0x: Is this "this-parameter" forwarder for function<void(???)> correct?

"Johannes Schaub (litb)" <schaub-johannes@web.de>
Thu, 23 Dec 2010 19:25:40 +0100
I read some discussion on how to best make

    struct Class { void f() { } };
    function<void(???)> f = bind(&Class::f, _1);

    Class c;

work with both




And I thought the following should work

template<typename T> struct ThisParam {
  T *t;
  ThisParam(T *t):t(t) { }
  ThisParam(T &t):t(&t) { }

  operator T*() const { return t; }
  operator T&() const { return *t; }

function<void(ThisParam<Class>)> f = bind(&Class::f, _1);
Class a;

But unfortunately, GCC doesn't like this. I thought the "operator T*" is
used by INVOKE(...)'s ((*t1).*f)(...). I supplied the "operator T&" in case
the user binds a function that wants a "Class&" as argument.

But GCC doesn't like the code when it has the "operator T&" - it only
accepts when i remove it. And I also find it confusing that it rejects when
I instead define it as follows and use it on a bound member function

template<typename T> struct ThisParam {
  T *t;
  ThisParam(T *t):t(t) { }
  ThisParam(T &t):t(&t) { }

  T &operator *() const { return *t; }

Why is this? Do I misread 20.8.2[func.require] or is GCC's C++0x standard
library broken? Thanks for any insights!

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