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[algorithm.equal_range, etc] Change recursive function parameters from "Iter, Iter" to "Iter, length."

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This commit is contained in:
Mitsuru Kariya 2013-09-01 00:13:23 +09:00
parent bbeb2f1b4b
commit 5b13f3b8a2
5 changed files with 97 additions and 25 deletions
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32
sprout/algorithm/equal_range.hpp
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@ -13,10 +13,30 @@
#include <sprout/config.hpp>
#include <sprout/algorithm/lower_bound.hpp>
#include <sprout/algorithm/upper_bound.hpp>
#include <sprout/iterator/operation.hpp>
#include <sprout/utility/pair/pair.hpp>
#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
namespace sprout {
namespace detail {
template<typename ForwardIterator, typename T, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
equal_range(
ForwardIterator first, typename std::iterator_traits<ForwardIterator>::difference_type len,
T const& value, Compare comp
)
{
return len == 0 ? sprout::pair<ForwardIterator, ForwardIterator>(first, first)
: comp(*sprout::next(first, len / 2), value)
? sprout::detail::equal_range(sprout::next(first, len / 2 + 1), len - (len / 2 + 1), value, comp)
: comp(value, *sprout::next(first, len / 2))
? sprout::detail::equal_range(first, len / 2, value, comp)
: sprout::pair<ForwardIterator, ForwardIterator>(
sprout::detail::lower_bound(first, len / 2, value, comp),
sprout::detail::upper_bound(sprout::next(first, len / 2 + 1), len - (len / 2 + 1), value, comp)
)
;
}
} // namespace detail
// 25.4.3.3 equal_range
//
@ -26,19 +46,13 @@ namespace sprout {
template<typename ForwardIterator, typename T, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
equal_range(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
return sprout::pair<ForwardIterator, ForwardIterator>(
sprout::lower_bound(first, last, value, comp),
sprout::upper_bound(first, last, value, comp)
);
return sprout::detail::equal_range(first, sprout::distance(first, last), value, comp);
}
template<typename ForwardIterator, typename T>
inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
equal_range(ForwardIterator first, ForwardIterator last, T const& value) {
return sprout::equal_range(
first, last, value,
NS_SSCRISK_CEL_OR_SPROUT::less<typename std::iterator_traits<ForwardIterator>::value_type>()
);
return sprout::equal_range(first, last, value, sprout::less<>());
}
} // namespace sprout