| // Boost.Signals library |
| |
| // Copyright Douglas Gregor 2001-2003. 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 <iostream> |
| #include <boost/signals/signal2.hpp> |
| #include <string> |
| #include <functional> |
| |
| void print_sum(int x, int y) |
| { |
| std::cout << "Sum = " << x+y << std::endl; |
| } |
| |
| void print_product(int x, int y) |
| { |
| std::cout << "Product = " << x*y << std::endl; |
| } |
| |
| void print_quotient(float x, float y) |
| { |
| std::cout << "Quotient = " << x/y << std::endl; |
| } |
| |
| int main() |
| { |
| typedef boost::signal2<void, int, int, boost::last_value<void>, |
| std::string, std::less<std::string>, |
| void (*)(int, int)> sig_type; |
| |
| sig_type sig; |
| sig.connect(&print_sum); |
| sig.connect(&print_product); |
| |
| sig(3, 5); // print sum and product of 3 and 5 |
| |
| // should fail |
| // sig.connect(&print_quotient); |
| } |