mirror of https://gitee.com/bigwinds/arangodb
39 lines
997 B
C++
39 lines
997 B
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 <algorithm>
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#include <iostream>
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#include <boost/signals/signal2.hpp>
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template<typename T>
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struct maximum {
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typedef T result_type;
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template<typename InputIterator>
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T operator()(InputIterator first, InputIterator last) const
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{
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if (first == last)
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throw std::runtime_error("Cannot compute maximum of zero elements!");
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return *std::max_element(first, last);
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}
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};
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int main()
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{
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boost::signal2<int, int, int, maximum<int> > sig_max;
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sig_max.connect(std::plus<int>());
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sig_max.connect(std::multiplies<int>());
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sig_max.connect(std::minus<int>());
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sig_max.connect(std::divides<int>());
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std::cout << sig_max(5, 3) << std::endl; // prints 15
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return 0;
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}
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