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/*
Copyright (c) Marshall Clow 2017.
Distributed under 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)
*/
/// \file transform_reduce.hpp
/// \brief Combine the (transformed) elements of a sequence (or two) into a single value.
/// \author Marshall Clow
#ifndef BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
#define BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
#include <functional> // for std::plus
#include <iterator> // for std::iterator_traits
#include <boost/config.hpp>
#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/range/value_type.hpp>
namespace boost { namespace algorithm {
template<class InputIterator, class OutputIterator, class T, class BinaryOperation>
OutputIterator inclusive_scan(InputIterator first, InputIterator last,
OutputIterator result, BinaryOperation bOp, T init)
{
for (; first != last; ++first, (void) ++result) {
init = bOp(init, *first);
*result = init;
}
return result;
}
template<class InputIterator, class OutputIterator, class BinaryOperation>
OutputIterator inclusive_scan(InputIterator first, InputIterator last,
OutputIterator result, BinaryOperation bOp)
{
if (first != last) {
typename std::iterator_traits<InputIterator>::value_type init = *first;
*result++ = init;
if (++first != last)
return boost::algorithm::inclusive_scan(first, last, result, bOp, init);
}
return result;
}
template<class InputIterator, class OutputIterator>
OutputIterator inclusive_scan(InputIterator first, InputIterator last,
OutputIterator result)
{
typedef typename std::iterator_traits<InputIterator>::value_type VT;
return boost::algorithm::inclusive_scan(first, last, result, std::plus<VT>());
}
}} // namespace boost and algorithm
#endif // BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP