#include <iostream>
#include <functional>

struct int_adder {
    typedef int first_argument_type;
    typedef int second_argument_type;
    typedef int result_type;
    int operator()(int a, int b) const { return a + b; }
};

int main() {
    std::cout << bind2nd(int_adder(), 3)(5) << '\n';
}

8