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add c++14 constexpr numeric algorithms

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bolero-MURAKAMI 2014-04-05 18:31:09 +09:00
parent fd608b74e2
commit f1555cb917
65 changed files with 433 additions and 150 deletions
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52
sprout/numeric/cxx14/partial_sum.hpp Normal file
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/*=============================================================================
Copyright (c) 2011-2014 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_NUMERIC_CXX14_PARTIAL_SUM_HPP
#define SPROUT_NUMERIC_CXX14_PARTIAL_SUM_HPP
#include <iterator>
#include <sprout/config.hpp>
#include <sprout/iterator/type_traits/is_iterator_of.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
namespace sprout {
//
// 26.7.4 Partial sum
//
template<
typename InputIterator, typename OutputIterator, typename BinaryOperation,
typename sprout::enabler_if<sprout::is_iterator_outputable<OutputIterator>::value>::type = sprout::enabler
>
inline SPROUT_CXX14_CONSTEXPR OutputIterator
partial_sum(InputIterator first, InputIterator last, OutputIterator result, BinaryOperation binary_op) {
typedef typename std::iterator_traits<InputIterator>::value_type value_type;
if (first == last) {
return result;
}
value_type sum = *first;
*result = sum;
while (++first != last) {
sum = binary_op(sum, *first);
*++result = sum;
}
return ++result;
}
template<
typename InputIterator, typename OutputIterator,
typename sprout::enabler_if<sprout::is_iterator_outputable<OutputIterator>::value>::type = sprout::enabler
>
inline SPROUT_CXX14_CONSTEXPR OutputIterator
partial_sum(InputIterator first, InputIterator last, OutputIterator result) {
return sprout::partial_sum(
first, last, result,
NS_SSCRISK_CEL_OR_SPROUT::plus<typename std::iterator_traits<InputIterator>::value_type>()
);
}
} // namespace sprout
#endif // #ifndef SPROUT_NUMERIC_CXX14_PARTIAL_SUM_HPP