Re: [boost] Bind question, is there any way to implicitly go through a reference_wrapper?

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();
}

}