mirror of https://gitee.com/bigwinds/arangodb
62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
// Boost.Signals library
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// Copyright Douglas Gregor 2001-2003. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// For more information, see http://www.boost.org
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#include <iostream>
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#include <boost/signals/signal2.hpp>
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#include <cassert>
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struct print_sum {
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void operator()(int x, int y) const { std::cout << x+y << std::endl; }
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};
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struct print_product {
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void operator()(int x, int y) const { std::cout << x*y << std::endl; }
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};
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struct print_difference {
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void operator()(int x, int y) const { std::cout << x-y << std::endl; }
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};
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struct print_quotient {
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void operator()(int x, int y) const { std::cout << x/-y << std::endl; }
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};
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int main()
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{
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boost::signal2<void, int, int> sig;
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sig.connect(print_sum());
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sig.connect(print_product());
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sig(3, 5);
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boost::signals::connection print_diff_con = sig.connect(print_difference());
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// sig is still connected to print_diff_con
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assert(print_diff_con.connected());
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sig(5, 3); // prints 8, 15, and 2
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print_diff_con.disconnect(); // disconnect the print_difference slot
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sig(5, 3); // now prints 8 and 15, but not the difference
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assert(!print_diff_con.connected()); // not connected any more
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{
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boost::signals::scoped_connection c = sig.connect(print_quotient());
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sig(5, 3); // prints 8, 15, and 1
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} // c falls out of scope, so sig and print_quotient are disconnected
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sig(5, 3); // prints 8 and 15
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return 0;
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}
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