mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
#ifndef SPROUT_NUMERIC_UNSTABLE_ACCUMLATE_HPP
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#define SPROUT_NUMERIC_UNSTABLE_ACCUMLATE_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/numeric/accumulate.hpp>
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#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
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#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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//
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// unstable_accumulate
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//
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namespace detail {
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template<typename T, typename RandomAccessIterator, typename BinaryOperation>
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inline SPROUT_CONSTEXPR T
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unstable_accumulate_ra(
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RandomAccessIterator first, RandomAccessIterator last, BinaryOperation binary_op,
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typename std::iterator_traits<RandomAccessIterator>::difference_type pivot
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)
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{
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return pivot == 0 ? *first
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: binary_op(
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sprout::detail::unstable_accumulate_ra<T>(
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first, sprout::next(first, pivot), binary_op,
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pivot / 2
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),
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sprout::detail::unstable_accumulate_ra<T>(
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sprout::next(first, pivot), last, binary_op,
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(NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) - pivot) / 2
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)
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)
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;
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}
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template<typename RandomAccessIterator, typename T, typename BinaryOperation>
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inline SPROUT_CONSTEXPR T
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unstable_accumulate(
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RandomAccessIterator first, RandomAccessIterator last, T init, BinaryOperation binary_op,
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std::random_access_iterator_tag*
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)
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{
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return first == last ? init
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: binary_op(
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init,
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sprout::detail::unstable_accumulate_ra<T>(
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first, last, binary_op,
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NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2
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)
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)
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;
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}
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template<typename InputIterator, typename T, typename BinaryOperation>
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inline SPROUT_CONSTEXPR T
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unstable_accumulate(
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InputIterator first, InputIterator last, T init, BinaryOperation binary_op,
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void*
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)
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{
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return sprout::accumulate(first, last, init, binary_op);
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}
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} // namespace detail
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template<typename InputIterator, typename T, typename BinaryOperation>
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inline SPROUT_CONSTEXPR T
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unstable_accumulate(InputIterator first, InputIterator last, T init, BinaryOperation binary_op) {
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typedef typename std::iterator_traits<InputIterator>::iterator_category* category;
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return sprout::detail::unstable_accumulate(first, last, init, binary_op, category());
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}
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template<typename InputIterator, typename T>
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inline SPROUT_CONSTEXPR T
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unstable_accumulate(InputIterator first, InputIterator last, T init) {
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return sprout::unstable_accumulate(
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first, last, 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_UNSTABLE_ACCUMLATE_HPP
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