boost/libs/function/test/mem_fun_portable.cpp

// Function library

// Copyright (C) 2001-2003 Douglas Gregor

// Use, modification and distribution is subject to the Boost Software 
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 
// http://www.boost.org/LICENSE_1_0.txt) 

// For more information, see http://www.boost.org/

    
#include <boost/function.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <iostream>
#include <functional>

struct Y {
    Y(int y = 0) : y_(y) {}
    bool operator==(const Y& rhs) { return y_ == rhs.y_; }
private:
    int y_;
    };

struct X {
  int foo(int);
  Y& foo2(Y&) const;
};
int X::foo(int x) { return -x; }
Y& X::foo2(Y& x) const { return x; }

int main()
{
    boost::function2<int, X*, int> f;
    boost::function2<Y&, X*, Y&> f2;
    Y y1;
    
    f = &X::foo;
    f2 = &X::foo2;

    X x;
    BOOST_TEST(f(&x, 5) == -5);
    BOOST_TEST(f2(&x, boost::ref(y1)) == y1);

    return ::boost::report_errors();
}