mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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89 lines
3.4 KiB
C++
89 lines
3.4 KiB
C++
#ifndef SPROUT_NUMERIC_UNSTABLE_INNNER_PRODUCT_HPP
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#define SPROUT_NUMERIC_UNSTABLE_INNNER_PRODUCT_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/numeric/inner_product.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_inner_product
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//
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namespace detail {
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template<typename T, typename RandomAccessIterator1, typename RandomAccessIterator2, typename BinaryOperation1, typename BinaryOperation2>
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inline SPROUT_CONSTEXPR T
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unstable_inner_product_ra(
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RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2,
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BinaryOperation1 binary_op1, BinaryOperation2 binary_op2,
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typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot
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)
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{
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return pivot == 0 ? binary_op2(*first1, *first2)
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: binary_op1(
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sprout::detail::unstable_inner_product_ra<T>(
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first1, sprout::next(first1, pivot), first2, binary_op1, binary_op2,
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pivot / 2
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),
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sprout::detail::unstable_inner_product_ra<T>(
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sprout::next(first1, pivot), last1, sprout::next(first2, pivot), binary_op1, binary_op2,
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(NS_SSCRISK_CEL_OR_SPROUT::distance(first1, last1) - pivot) / 2
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)
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)
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;
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}
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template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename T, typename BinaryOperation1, typename BinaryOperation2>
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inline SPROUT_CONSTEXPR T
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unstable_inner_product(
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RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2, T init,
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BinaryOperation1 binary_op1, BinaryOperation2 binary_op2,
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std::random_access_iterator_tag*
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)
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{
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return first1 == last1 ? init
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: binary_op1(
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init,
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sprout::detail::unstable_inner_product_ra<T>(
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first1, last1, first2, binary_op1, binary_op2,
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NS_SSCRISK_CEL_OR_SPROUT::distance(first1, last1) / 2
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)
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)
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;
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}
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template<typename InputIterator1, typename InputIterator2, typename T, typename BinaryOperation1, typename BinaryOperation2>
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inline SPROUT_CONSTEXPR T
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unstable_inner_product(
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InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, T init,
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BinaryOperation1 binary_op1, BinaryOperation2 binary_op2,
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void*
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)
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{
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return sprout::inner_product(first1, last1, first2, init, binary_op1, binary_op2);
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}
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} // namespace detail
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template<typename InputIterator1, typename InputIterator2, typename T, typename BinaryOperation1, typename BinaryOperation2>
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inline SPROUT_CONSTEXPR T
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unstable_inner_product(
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InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, T init,
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BinaryOperation1 binary_op1, BinaryOperation2 binary_op2
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)
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{
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typedef typename std::iterator_traits<InputIterator1>::iterator_category* category;
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return sprout::detail::unstable_inner_product(first1, last1, first2, init, binary_op1, binary_op2, category());
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}
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template<typename InputIterator1, typename InputIterator2, typename T>
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inline SPROUT_CONSTEXPR T
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unstable_inner_product(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, T init) {
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return sprout::unstable_inner_product(
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first1, last1, first2, init,
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sprout::plus<typename std::iterator_traits<InputIterator1>::value_type>(),
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NS_SSCRISK_CEL_OR_SPROUT::multiplies<typename std::iterator_traits<InputIterator1>::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_INNNER_PRODUCT_HPP
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