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55 lines
2 KiB
C++
55 lines
2 KiB
C++
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/*=============================================================================
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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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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#ifndef SPROUT_NUMERIC_CXX14_EXCLUSIVE_SCAN_HPP
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#define SPROUT_NUMERIC_CXX14_EXCLUSIVE_SCAN_HPP
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#include <sprout/config.hpp>
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#include <sprout/utility/move.hpp>
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#include <sprout/iterator/type_traits/is_iterator_of.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/numeric/cxx14/partial_sum.hpp>
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namespace sprout {
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//
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// 29.8.7 Exclusive scan
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//
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template<
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typename InputIterator, typename OutputIterator, typename T, typename BinaryOperation,
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typename sprout::enabler_if<sprout::is_iterator_outputable<OutputIterator>::value>::type = sprout::enabler
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>
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inline SPROUT_CXX14_CONSTEXPR OutputIterator
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exclusive_scan(InputIterator first, InputIterator last, OutputIterator result, T init, BinaryOperation binary_op) {
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typedef typename std::iterator_traits<InputIterator>::value_type value_type;
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value_type sum = sprout::move(init);
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*result = sum;
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if (first == last) {
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return ++result;
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}
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value_type temp = *first;
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while (++first != last) {
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sum = binary_op(sum, temp);
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*++result = sum;
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temp = *first;
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}
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return ++result;
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}
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template<
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typename InputIterator, typename OutputIterator, typename T,
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typename sprout::enabler_if<sprout::is_iterator_outputable<OutputIterator>::value>::type = sprout::enabler
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>
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inline SPROUT_CXX14_CONSTEXPR OutputIterator
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exclusive_scan(InputIterator first, InputIterator last, OutputIterator result, T init) {
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return sprout::exclusive_scan(
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first, last, result, init,
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NS_SSCRISK_CEL_OR_SPROUT::plus<typename std::iterator_traits<InputIterator>::value_type>()
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);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_NUMERIC_CXX14_EXCLUSIVE_SCAN_HPP
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