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// Boost.Signals library
// Copyright Douglas Gregor 2001-2003. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org
#include <algorithm>
#include <iostream>
#include <boost/signals/signal2.hpp>
template<typename T>
struct maximum {
typedef T result_type;
template<typename InputIterator>
T operator()(InputIterator first, InputIterator last) const
{
if (first == last)
throw std::runtime_error("Cannot compute maximum of zero elements!");
return *std::max_element(first, last);
}
};
int main()
{
boost::signal2<int, int, int, maximum<int> > sig_max;
sig_max.connect(std::plus<int>());
sig_max.connect(std::multiplies<int>());
sig_max.connect(std::minus<int>());
sig_max.connect(std::divides<int>());
std::cout << sig_max(5, 3) << std::endl; // prints 15
return 0;
}
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