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+/*
+ Copyright (c) Marshall Clow 2017.
+
+ Distributed under the Boost Software License, Version 1.0. (See accompanying
+ file LICENSE10.txt or copy at http://www.boost.org/LICENSE10.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/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/range/value_type.hpp>
+
+namespace boost { namespace algorithm {
+
+template<class InputIterator1, class InputIterator2, class T,
+ class BinaryOperation1, class BinaryOperation2>
+T transform_reduce(InputIterator1 first1, InputIterator1 last1,
+ InputIterator2 first2, T init,
+ BinaryOperation1 bOp1, BinaryOperation2 bOp2)
+{
+ for (; first1 != last1; ++first1, (void) ++first2)
+ init = bOp1(init, bOp2(*first1, *first2));
+ return init;
+}
+
+template<class InputIterator, class T,
+ class BinaryOperation, class UnaryOperation>
+T transform_reduce(InputIterator first, InputIterator last,
+ T init, BinaryOperation bOp, UnaryOperation uOp)
+{
+ for (; first != last; ++first)
+ init = bOp(init, uOp(*first));
+ return init;
+}
+
+template<class InputIterator1, class InputIterator2, class T>
+T transform_reduce(InputIterator1 first1, InputIterator1 last1,
+ InputIterator2 first2, T init)
+{
+ return transform_reduce(first1, last1, first2, init,
+ std::plus<T>(), std::multiplies<T>());
+}
+
+}} // namespace boost and algorithm
+
+#endif // BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP