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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 BinaryOperation, class UnaryOperation, class T>
- OutputIterator transform_inclusive_scan(InputIterator first, InputIterator last,
- OutputIterator result,
- BinaryOperation bOp, UnaryOperation uOp,
- T init)
- {
- for (; first != last; ++first, (void) ++result) {
- init = bOp(init, uOp(*first));
- *result = init;
- }
- return result;
- }
- template<class InputIterator, class OutputIterator,
- class BinaryOperation, class UnaryOperation>
- OutputIterator transform_inclusive_scan(InputIterator first, InputIterator last,
- OutputIterator result,
- BinaryOperation bOp, UnaryOperation uOp)
- {
- if (first != last) {
- typename std::iterator_traits<InputIterator>::value_type init = uOp(*first);
- *result++ = init;
- if (++first != last)
- return boost::algorithm::transform_inclusive_scan
- (first, last, result, bOp, uOp, init);
- }
- return result;
- }
- }} // namespace boost and algorithm
- #endif // BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
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