mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
55 lines
2 KiB
C++
55 lines
2 KiB
C++
|
/*=============================================================================
|
||
|
|
Copyright (c) 2011-2017 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_EXCLUSIVE_SCAN_HPP
|
||
|
|
#define SPROUT_NUMERIC_CXX14_EXCLUSIVE_SCAN_HPP
|
||
|
|
|
||
|
|
#include <sprout/config.hpp>
|
||
|
|
#include <sprout/utility/move.hpp>
|
||
|
|
#include <sprout/iterator/type_traits/is_iterator_of.hpp>
|
||
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
||
|
|
#include <sprout/numeric/cxx14/partial_sum.hpp>
|
||
|
|
|
||
|
|
namespace sprout {
|
||
|
|
//
|
||
|
|
// 29.8.7 Exclusive scan
|
||
|
|
//
|
||
|
|
template<
|
||
|
|
typename InputIterator, typename OutputIterator, typename T, typename BinaryOperation,
|
||
|
|
typename sprout::enabler_if<sprout::is_iterator_outputable<OutputIterator>::value>::type = sprout::enabler
|
||
|
|
>
|
||
|
|
inline SPROUT_CXX14_CONSTEXPR OutputIterator
|
||
|
|
exclusive_scan(InputIterator first, InputIterator last, OutputIterator result, T init, BinaryOperation binary_op) {
|
||
|
|
typedef typename std::iterator_traits<InputIterator>::value_type value_type;
|
||
|
|
value_type sum = sprout::move(init);
|
||
|
|
*result = sum;
|
||
|
|
if (first == last) {
|
||
|
|
return ++result;
|
||
|
|
}
|
||
|
|
value_type temp = *first;
|
||
|
|
while (++first != last) {
|
||
|
|
sum = binary_op(sum, temp);
|
||
|
|
*++result = sum;
|
||
|
|
temp = *first;
|
||
|
|
}
|
||
|
|
return ++result;
|
||
|
|
}
|
||
|
|
template<
|
||
|
|
typename InputIterator, typename OutputIterator, typename T,
|
||
|
|
typename sprout::enabler_if<sprout::is_iterator_outputable<OutputIterator>::value>::type = sprout::enabler
|
||
|
|
>
|
||
|
|
inline SPROUT_CXX14_CONSTEXPR OutputIterator
|
||
|
|
exclusive_scan(InputIterator first, InputIterator last, OutputIterator result, T init) {
|
||
|
|
return sprout::exclusive_scan(
|
||
|
|
first, last, result, init,
|
||
|
|
NS_SSCRISK_CEL_OR_SPROUT::plus<typename std::iterator_traits<InputIterator>::value_type>()
|
||
|
|
);
|
||
|
|
}
|
||
|
|
} // namespace sprout
|
||
|
|
|
||
|
|
#endif // #ifndef SPROUT_NUMERIC_CXX14_EXCLUSIVE_SCAN_HPP
|