1 | // Boost.Signals library |
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2 | |
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3 | // Copyright Douglas Gregor 2001-2003. Use, modification and |
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4 | // distribution is subject to the Boost Software License, Version |
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5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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6 | // http://www.boost.org/LICENSE_1_0.txt) |
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7 | |
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8 | // For more information, see http://www.boost.org |
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9 | |
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10 | #include <iostream> |
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11 | #include <boost/signals/signal2.hpp> |
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12 | #include <cassert> |
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13 | |
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14 | struct print_sum { |
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15 | void operator()(int x, int y) const { std::cout << x+y << std::endl; } |
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16 | }; |
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17 | |
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18 | struct print_product { |
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19 | void operator()(int x, int y) const { std::cout << x*y << std::endl; } |
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20 | }; |
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21 | |
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22 | struct print_difference { |
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23 | void operator()(int x, int y) const { std::cout << x-y << std::endl; } |
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24 | }; |
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25 | |
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26 | int main() |
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27 | { |
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28 | boost::signal2<void, int, int> sig; |
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29 | |
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30 | sig.connect(print_sum()); |
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31 | sig.connect(print_product()); |
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32 | |
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33 | sig(3, 5); |
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34 | |
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35 | boost::signals::connection print_diff_con = sig.connect(print_difference()); |
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36 | |
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37 | // sig is still connected to print_diff_con |
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38 | assert(print_diff_con.connected()); |
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39 | |
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40 | sig(5, 3); // prints 8, 15, and 2 |
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41 | |
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42 | print_diff_con.disconnect(); // disconnect the print_difference slot |
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43 | |
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44 | sig(5, 3); // now prints 8 and 15, but not the difference |
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45 | |
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46 | assert(!print_diff_con.connected()); // not connected any more |
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47 | return 0; |
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48 | } |
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