57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
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/*
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Copyright (c) Marshall Clow 2017.
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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/// \file transform_reduce.hpp
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/// \brief Combine the (transformed) elements of a sequence (or two) into a single value.
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/// \author Marshall Clow
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#ifndef BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
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#define BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
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#include <functional> // for std::plus
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#include <iterator> // for std::iterator_traits
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#include <boost/config.hpp>
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#include <boost/range/begin.hpp>
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#include <boost/range/end.hpp>
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#include <boost/range/value_type.hpp>
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namespace boost { namespace algorithm {
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template<class InputIterator1, class InputIterator2, class T,
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class BinaryOperation1, class BinaryOperation2>
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T transform_reduce(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, T init,
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BinaryOperation1 bOp1, BinaryOperation2 bOp2)
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{
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for (; first1 != last1; ++first1, (void) ++first2)
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init = bOp1(init, bOp2(*first1, *first2));
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return init;
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}
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template<class InputIterator, class T,
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class BinaryOperation, class UnaryOperation>
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T transform_reduce(InputIterator first, InputIterator last,
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T init, BinaryOperation bOp, UnaryOperation uOp)
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{
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for (; first != last; ++first)
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init = bOp(init, uOp(*first));
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return init;
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}
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template<class InputIterator1, class InputIterator2, class T>
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T transform_reduce(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, T init)
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{
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return boost::algorithm::transform_reduce(first1, last1, first2, init,
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std::plus<T>(), std::multiplies<T>());
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}
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}} // namespace boost and algorithm
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#endif // BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
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