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52 lines
1.9 KiB
C++
52 lines
1.9 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 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_PARTIAL_SUM_HPP
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#define SPROUT_NUMERIC_CXX14_PARTIAL_SUM_HPP
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#include <iterator>
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#include <sprout/config.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 HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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//
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// 26.7.4 Partial sum
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//
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template<
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typename InputIterator, typename OutputIterator, 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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partial_sum(InputIterator first, InputIterator last, OutputIterator result, BinaryOperation binary_op) {
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typedef typename std::iterator_traits<InputIterator>::value_type value_type;
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if (first == last) {
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return result;
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}
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value_type sum = *first;
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*result = sum;
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while (++first != last) {
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sum = binary_op(sum, *first);
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*++result = sum;
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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,
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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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partial_sum(InputIterator first, InputIterator last, OutputIterator result) {
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return sprout::partial_sum(
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first, last, result,
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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_PARTIAL_SUM_HPP
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