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add C++14 version partition_point

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This commit is contained in:
Mitsuru Kariya 2015-02-11 23:15:08 +09:00
parent 586c9972dc
commit aba6d6b678
1 changed files with 23 additions and 1 deletions
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24
sprout/algorithm/partition_point.hpp
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@ -13,7 +13,7 @@
#include <sprout/iterator/operation.hpp>
namespace sprout {
#ifdef SPROUT_CONFIG_DISABLE_CXX14_CONSTEXPR
namespace detail {
template<typename ForwardIterator, typename Predicate>
inline SPROUT_CONSTEXPR ForwardIterator
@ -43,7 +43,29 @@ namespace sprout {
first, last, pred,
sprout::next(first, sprout::distance(first, last) / 2)
);
#else
// 25.3.13 Partitions
//
// recursion depth:
// 0
//
template<typename ForwardIterator, typename Predicate>
inline SPROUT_CONSTEXPR ForwardIterator
partition_point(ForwardIterator first, ForwardIterator last, Predicate pred) {
typedef typename std::iterator_traits<ForwardIterator>::difference_type difference_type;
for (difference_type len = sprout::distance(first, last); len != 0; ) {
const difference_type half = len / 2;
const ForwardIterator mid = sprout::next(first, half);
if (pred(*mid)) {
first = sprout::next(mid);
len -= half + 1;
} else {
len = half;
}
}
return first;
}
#endif
} // namespace sprout
#endif // #ifndef SPROUT_ALGORITHM_PARTITION_POINT_HPP