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1 | // Boost.Signals library |
2 | ||
3 | // Copyright Douglas Gregor 2001-2003. Use, modification and | |
4 | // distribution is subject to the Boost Software License, Version | |
5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt) | |
7 | ||
8 | // For more information, see http://www.boost.org | |
9 | ||
10 | #include <algorithm> | |
11 | #include <iostream> | |
12 | #include <boost/signals/signal2.hpp> | |
13 | ||
14 | template<typename T> | |
15 | struct maximum { | |
16 | typedef T result_type; | |
17 | ||
18 | template<typename InputIterator> | |
19 | T operator()(InputIterator first, InputIterator last) const | |
20 | { | |
21 | if (first == last) | |
22 | throw std::runtime_error("Cannot compute maximum of zero elements!"); | |
23 | return *std::max_element(first, last); | |
24 | } | |
25 | }; | |
26 | ||
27 | int main() | |
28 | { | |
29 | boost::signal2<int, int, int, maximum<int> > sig_max; | |
30 | sig_max.connect(std::plus<int>()); | |
31 | sig_max.connect(std::multiplies<int>()); | |
32 | sig_max.connect(std::minus<int>()); | |
33 | sig_max.connect(std::divides<int>()); | |
34 | ||
35 | std::cout << sig_max(5, 3) << std::endl; // prints 15 | |
36 | ||
37 | return 0; | |
38 | } |