From: Peter Dimov (pdimov_at_[hidden])
Date: 2008-07-15 15:28:34
Michael Goldshteyn:
> // This doesn't compile, however, even though the reference_wrapper class
> template has
> // an overloaded operator T& () const function
>
> std::string
> colorFromConstRef2(boost::bind(&Crayon::GetColor,_1)(crefCr));
It doesn't because of the mem_fn behavior that bind inherits. The argument
is not a reference to Crayon and so is assumed to be a smart pointer to
Crayon. mem_fn then tries to invoke get_pointer() on it to obtain a Crayon*.
You should be able to make it compile by adding a get_pointer overload for
reference_wrapper:
namespace boost
{
template<class T> T* get_pointer( reference_wrapper<T> const & r )
{
return r.get_pointer();
}
}