#include <boost/function.hpp>
#include <iostream>
#include <functional>
struct X {
int foo(int);
};
int X::foo(int x) { return -x; }
int main()
{
boost::function1<int, int> f;
X x;
f = std::bind1st(std::mem_fun(&X::foo), &x);
f(5); // Call x.foo(5)
}