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https://github.com/bolero-MURAKAMI/Sprout.git
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54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
#ifndef SPROUT_NUMERIC_INNNER_PRODUCT_HPP
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#define SPROUT_NUMERIC_INNNER_PRODUCT_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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// 26.7.3 Inner product
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template<typename InputIterator1, typename InputIterator2, typename T, typename BinaryOperation1, typename BinaryOperation2>
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SPROUT_CONSTEXPR T inner_product(
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InputIterator1 first1,
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InputIterator1 last1,
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InputIterator2 first2,
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T init,
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BinaryOperation1 binary_op1,
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BinaryOperation2 binary_op2
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)
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{
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return first1 == last1 ? init
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: sprout::inner_product(
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sprout::next(first1),
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last1,
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sprout::next(first2),
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binary_op1(init, binary_op2(*first1, *first2)),
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binary_op1,
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binary_op2
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)
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;
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}
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template<typename InputIterator1, typename InputIterator2, typename T>
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SPROUT_CONSTEXPR T inner_product(
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InputIterator1 first1,
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InputIterator1 last1,
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InputIterator2 first2,
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T init
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)
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{
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return sprout::inner_product(
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first1,
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last1,
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first2,
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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_INNNER_PRODUCT_HPP
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