forked from boostorg/algorithm
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/*
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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 exclusive_scan.hpp
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/// \brief ???
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/// \author Marshall Clow
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#ifndef BOOST_ALGORITHM_EXCLUSIVE_SCAN_HPP
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#define BOOST_ALGORITHM_EXCLUSIVE_SCAN_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 InputIterator, class OutputIterator, class T, class BinaryOperation>
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OutputIterator exclusive_scan(InputIterator first, InputIterator last,
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OutputIterator result, T init, BinaryOperation bOp)
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{
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if (first != last)
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{
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T saved = init;
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do
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{
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init = bOp(init, *first);
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*result = saved;
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saved = init;
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++result;
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} while (++first != last);
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}
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return result;
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}
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template<class InputIterator, class OutputIterator, class T>
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OutputIterator exclusive_scan(InputIterator first, InputIterator last,
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OutputIterator result, T init)
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{
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typedef typename std::iterator_traits<InputIterator>::value_type VT;
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return boost::algorithm::exclusive_scan(first, last, result, init, std::plus<VT>());
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}
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}} // namespace boost and algorithm
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#endif // BOOST_ALGORITHM_EXCLUSIVE_SCAN_HPP
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