boost bind doesn't work with inherited structures

[jia3ep@…]

The following code gives an error in VC++2008, VC++2010, g++ 4.2.4:

#include <boost/bind.hpp>

struct Y {
	void reset() {};	
};

template<typename T1, typename T2>
struct my_pair {
	T1 first;
	T2 second;
};

template<typename T1, typename T2>
struct my_pair2 : my_pair<T1, T2> {};

typedef my_pair<int, Y> mypair_t;
typedef my_pair2<int, Y> mypair2_t;

int main()
{
	mypair_t t1;
	mypair2_t t2;

	boost::bind<Y&>( &mypair_t::second, _1 )( t1 ).reset();  // OK!
	boost::bind<Y&>( &mypair2_t::second, _1 )( t2 ).reset(); // error: cannot convert from 'const Y' to 'Y &'

	return 0;
}

[Steven Watanabe]

This is a result of mem_fn's logic for handling get_pointer. I'm somewhat hesitant to touch this, as it's rather easy to break older compilers.