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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 <iostream> | |
11 | #include <boost/signals/signal2.hpp> | |
12 | #include <cassert> | |
13 | ||
14 | struct print_sum { | |
15 | void operator()(int x, int y) const { std::cout << x+y << std::endl; } | |
16 | }; | |
17 | ||
18 | struct print_product { | |
19 | void operator()(int x, int y) const { std::cout << x*y << std::endl; } | |
20 | }; | |
21 | ||
22 | struct print_difference { | |
23 | void operator()(int x, int y) const { std::cout << x-y << std::endl; } | |
24 | }; | |
25 | ||
26 | struct print_quotient { | |
27 | void operator()(int x, int y) const { std::cout << x/-y << std::endl; } | |
28 | }; | |
29 | ||
30 | ||
31 | int main() | |
32 | { | |
33 | boost::signal2<void, int, int> sig; | |
34 | ||
35 | sig.connect(print_sum()); | |
36 | sig.connect(print_product()); | |
37 | ||
38 | sig(3, 5); | |
39 | ||
40 | boost::signals::connection print_diff_con = sig.connect(print_difference()); | |
41 | ||
42 | // sig is still connected to print_diff_con | |
43 | assert(print_diff_con.connected()); | |
44 | ||
45 | sig(5, 3); // prints 8, 15, and 2 | |
46 | ||
47 | print_diff_con.disconnect(); // disconnect the print_difference slot | |
48 | ||
49 | sig(5, 3); // now prints 8 and 15, but not the difference | |
50 | ||
51 | assert(!print_diff_con.connected()); // not connected any more | |
52 | ||
53 | { | |
54 | boost::signals::scoped_connection c = sig.connect(print_quotient()); | |
55 | sig(5, 3); // prints 8, 15, and 1 | |
56 | } // c falls out of scope, so sig and print_quotient are disconnected | |
57 | ||
58 | sig(5, 3); // prints 8 and 15 | |
59 | ||
60 | return 0; | |
61 | } |