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intermediate

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fix tristate_lexicographical_compare(w/delimiter version)

reduce complexity

remove unnecessary code etc.

remove testcode
This commit is contained in:
Mitsuru Kariya 2013-09-02 09:39:02 +09:00
parent 5686785ea9
commit 2e984eacb7
3 changed files with 151 additions and 226 deletions
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100
sprout/algorithm/lexicographical_compare.hpp
View file

@ -11,7 +11,8 @@
#include <iterator> #include <iterator>
#include <type_traits> #include <type_traits>
#include <sprout/config.hpp> #include <sprout/config.hpp>
#include <sprout/iterator/operation.hpp> #include <sprout/detail/algorithm/lexicographical_compare.hpp>
#include <sprout/iterator/distance.hpp>
#include <sprout/iterator/type_traits/category.hpp> #include <sprout/iterator/type_traits/category.hpp>
#include <sprout/iterator/type_traits/common.hpp> #include <sprout/iterator/type_traits/common.hpp>
#include <sprout/utility/pair/pair.hpp> #include <sprout/utility/pair/pair.hpp>
@ -20,55 +21,16 @@
namespace sprout { namespace sprout {
namespace detail { namespace detail {
template<typename InputIterator1, typename InputIterator2, typename Compare> template<typename Difference1, typename Difference2>
inline SPROUT_CONSTEXPR bool inline SPROUT_CONSTEXPR bool
lexicographical_compare_impl_check( lexicographical_compare_impl_check(
InputIterator1 last1, InputIterator2 last2, Compare comp, Difference1 size1, Difference2 size2,
sprout::pair<InputIterator1, InputIterator2> const& found int found
) )
{ {
return found.second == last2 ? false return found < 0 || found == 2 && size1 < size2;
: found.first == last1 || comp(*found.first, *found.second)
;
} }
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<RandomAccessIterator1, RandomAccessIterator2>
lexicographical_compare_impl_ra_1(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2, RandomAccessIterator2 last2, Compare comp,
typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot, sprout::pair<RandomAccessIterator1, RandomAccessIterator2> const& found
)
{
typedef sprout::pair<RandomAccessIterator1, RandomAccessIterator2> found_type;
return found.first != first1 ? found
: pivot == 0 ? (comp(*first1, *first2) || comp(*first2, *first1) ? found_type(first1, first2) : found_type(last1, last2))
: sprout::detail::lexicographical_compare_impl_ra_1(
sprout::next(first1, pivot), last1, sprout::next(first2, pivot), last2, comp,
(sprout::distance(first1, last1) - pivot) / 2,
sprout::detail::lexicographical_compare_impl_ra_1(
first1, sprout::next(first1, pivot), first2, sprout::next(first2, pivot), comp,
pivot / 2,
found_type(first1, first2)
)
)
;
}
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare>
inline SPROUT_CONSTEXPR bool
lexicographical_compare_impl_ra(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2, RandomAccessIterator2 last2, Compare comp,
typename std::iterator_traits<RandomAccessIterator1>::difference_type size
)
{
typedef sprout::pair<RandomAccessIterator1, RandomAccessIterator2> found_type;
return sprout::detail::lexicographical_compare_impl_check(
last1, last2, comp,
sprout::detail::lexicographical_compare_impl_ra_1(
first1, sprout::next(first1, size), first2, sprout::next(first2, size), comp,
size / 2, found_type(first1, first2)
)
);
}
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare> template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare>
inline SPROUT_CONSTEXPR typename std::enable_if< inline SPROUT_CONSTEXPR typename std::enable_if<
sprout::is_constant_distance_iterator<RandomAccessIterator1>::value, sprout::is_constant_distance_iterator<RandomAccessIterator1>::value,
@ -81,53 +43,29 @@ namespace sprout {
{ {
return first2 == last2 ? false return first2 == last2 ? false
: first1 == last1 ? true : first1 == last1 ? true
: sprout::detail::lexicographical_compare_impl_ra( : sprout::detail::lexicographical_compare_impl_check(
first1, last1, first2, last2, comp, sprout::distance(first1, last1), sprout::distance(first2, last2),
NS_SSCRISK_CEL_OR_SPROUT::min(sprout::distance(first1, last1), sprout::distance(first2, last2)) sprout::detail::lexicographical_compare_impl_ra(
first1, first2, comp,
NS_SSCRISK_CEL_OR_SPROUT::min(sprout::distance(first1, last1), sprout::distance(first2, last2)),
2
)
) )
; ;
} }
template<typename InputIterator1, typename InputIterator2, typename Compare> template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2> inline SPROUT_CONSTEXPR bool
lexicographical_compare_impl_1( lexicographical_compare_impl_check(
sprout::pair<InputIterator1, InputIterator2> current,
InputIterator1 last1, InputIterator2 last2, Compare comp, InputIterator1 last1, InputIterator2 last2, Compare comp,
typename std::iterator_traits<InputIterator1>::difference_type n sprout::pair<InputIterator1, InputIterator2> const& found
) )
{ {
typedef sprout::pair<InputIterator1, InputIterator2> type; return found.second == last2 ? false
return current.second == last2 || current.first == last1 ? current : found.first == last1 || comp(*found.first, *found.second)
: n == 1 ? comp(*current.first, *current.second) ? type(last1, current.second)
: comp(*current.second, *current.first) ? type(current.first, last2)
: type(sprout::next(current.first), sprout::next(current.second))
: sprout::detail::lexicographical_compare_impl_1(
sprout::detail::lexicographical_compare_impl_1(
current,
last1, last2, comp, n / 2
),
last1, last2, comp, n - n / 2
)
;
}
template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2>
lexicographical_compare_impl(
sprout::pair<InputIterator1, InputIterator2> current,
InputIterator1 last1, InputIterator2 last2, Compare comp,
typename std::iterator_traits<InputIterator1>::difference_type n
)
{
return current.second == last2 || current.first == last1 ? current
: sprout::detail::lexicographical_compare_impl(
sprout::detail::lexicographical_compare_impl_1(
current,
last1, last2, comp, n
),
last1, last2, comp, n * 2
)
; ;
} }
template<typename InputIterator1, typename InputIterator2, typename Compare> template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR bool inline SPROUT_CONSTEXPR bool
lexicographical_compare( lexicographical_compare(

204
sprout/algorithm/tristate_lexicographical_compare.hpp
View file

@ -11,6 +11,7 @@
#include <iterator> #include <iterator>
#include <type_traits> #include <type_traits>
#include <sprout/config.hpp> #include <sprout/config.hpp>
#include <sprout/detail/algorithm/lexicographical_compare.hpp>
#include <sprout/iterator/operation.hpp> #include <sprout/iterator/operation.hpp>
#include <sprout/iterator/type_traits/category.hpp> #include <sprout/iterator/type_traits/category.hpp>
#include <sprout/iterator/type_traits/common.hpp> #include <sprout/iterator/type_traits/common.hpp>
@ -20,58 +21,18 @@
namespace sprout { namespace sprout {
namespace detail { namespace detail {
template<typename InputIterator1, typename InputIterator2, typename Compare> template<typename Difference1, typename Difference2>
inline SPROUT_CONSTEXPR int inline SPROUT_CONSTEXPR int
tristate_lexicographical_compare_impl_check( tristate_lexicographical_compare_impl_ra_check(
InputIterator1 last1, InputIterator2 last2, Compare comp, Difference1 size1, Difference2 size2, int found
sprout::pair<InputIterator1, InputIterator2> const& found
) )
{ {
return found.second == last2 ? (found.first == last1 ? 0 : 1) return found != 2 ? found
: found.first == last1 ? -1 : size1 < size2 ? -1
: comp(*found.first, *found.second) ? -1 : size1 > size2 ? 1 : 0
: comp(*found.second, *found.first) ? 1
: 0
; ;
} }
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<RandomAccessIterator1, RandomAccessIterator2>
tristate_lexicographical_compare_impl_ra_1(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2, RandomAccessIterator2 last2, Compare comp,
typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot, sprout::pair<RandomAccessIterator1, RandomAccessIterator2> const& found
)
{
typedef sprout::pair<RandomAccessIterator1, RandomAccessIterator2> found_type;
return found.first != first1 ? found
: pivot == 0 ? (comp(*first1, *first2) || comp(*first2, *first1) ? found_type(first1, first2) : found_type(last1, last2))
: sprout::detail::tristate_lexicographical_compare_impl_ra_1(
sprout::next(first1, pivot), last1, sprout::next(first2, pivot), last2, comp,
(sprout::distance(first1, last1) - pivot) / 2,
sprout::detail::tristate_lexicographical_compare_impl_ra_1(
first1, sprout::next(first1, pivot), first2, sprout::next(first2, pivot), comp,
pivot / 2,
found_type(first1, first2)
)
)
;
}
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare>
inline SPROUT_CONSTEXPR int
tristate_lexicographical_compare_impl_ra(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2, RandomAccessIterator2 last2, Compare comp,
typename std::iterator_traits<RandomAccessIterator1>::difference_type size
)
{
typedef sprout::pair<RandomAccessIterator1, RandomAccessIterator2> found_type;
return sprout::detail::tristate_lexicographical_compare_impl_check(
last1, last2, comp,
sprout::detail::tristate_lexicographical_compare_impl_ra_1(
first1, sprout::next(first1, size), first2, sprout::next(first2, size), comp,
size / 2, found_type(first1, first2)
)
);
}
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare> template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare>
inline SPROUT_CONSTEXPR typename std::enable_if< inline SPROUT_CONSTEXPR typename std::enable_if<
sprout::is_constant_distance_iterator<RandomAccessIterator1>::value, sprout::is_constant_distance_iterator<RandomAccessIterator1>::value,
@ -84,53 +45,32 @@ namespace sprout {
{ {
return first2 == last2 ? (first1 == last1 ? 0 : 1) return first2 == last2 ? (first1 == last1 ? 0 : 1)
: first1 == last1 ? -1 : first1 == last1 ? -1
: sprout::detail::tristate_lexicographical_compare_impl_ra( : sprout::detail::tristate_lexicographical_compare_impl_ra_check(
first1, last1, first2, last2, comp, sprout::distance(first1, last1), sprout::distance(first2, last2),
NS_SSCRISK_CEL_OR_SPROUT::min(sprout::distance(first1, last1), sprout::distance(first2, last2)) sprout::detail::lexicographical_compare_impl_ra(
first1, first2, comp,
NS_SSCRISK_CEL_OR_SPROUT::min(sprout::distance(first1, last1), sprout::distance(first2, last2)),
2
)
) )
; ;
} }
template<typename InputIterator1, typename InputIterator2, typename Compare> template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2> inline SPROUT_CONSTEXPR int
tristate_lexicographical_compare_impl_1( tristate_lexicographical_compare_impl_check(
sprout::pair<InputIterator1, InputIterator2> const& current, InputIterator1 last1, InputIterator2 last2, Compare comp,
InputIterator1 last1, InputIterator2 last2, Compare comp, sprout::pair<InputIterator1, InputIterator2> const& found
typename std::iterator_traits<InputIterator1>::difference_type n )
)
{ {
typedef sprout::pair<InputIterator1, InputIterator2> type; return found.second == last2 ? (found.first == last1 ? 0 : 1)
return current.second == last2 || current.first == last1 ? current : found.first == last1 ? -1
: n == 1 ? comp(*current.first, *current.second) ? type(last1, current.second) : comp(*found.first, *found.second) ? -1
: comp(*current.second, *current.first) ? type(current.first, last2) : comp(*found.second, *found.first) ? 1
: type(sprout::next(current.first), sprout::next(current.second)) : 0
: sprout::detail::tristate_lexicographical_compare_impl_1( ;
sprout::detail::tristate_lexicographical_compare_impl_1(
current,
last1, last2, comp, n / 2
),
last1, last2, comp, n - n / 2
)
;
}
template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2>
tristate_lexicographical_compare_impl(
sprout::pair<InputIterator1, InputIterator2> const& current,
InputIterator1 last1, InputIterator2 last2, Compare comp,
typename std::iterator_traits<InputIterator1>::difference_type n
)
{
return current.second == last2 || current.first == last1 ? current
: sprout::detail::tristate_lexicographical_compare_impl(
sprout::detail::tristate_lexicographical_compare_impl_1(
current,
last1, last2, comp, n
),
last1, last2, comp, n * 2
)
;
} }
template<typename InputIterator1, typename InputIterator2, typename Compare> template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR int inline SPROUT_CONSTEXPR int
tristate_lexicographical_compare( tristate_lexicographical_compare(
@ -141,7 +81,7 @@ namespace sprout {
typedef sprout::pair<InputIterator1, InputIterator2> type; typedef sprout::pair<InputIterator1, InputIterator2> type;
return sprout::detail::tristate_lexicographical_compare_impl_check( return sprout::detail::tristate_lexicographical_compare_impl_check(
last1, last2, comp, last1, last2, comp,
sprout::detail::tristate_lexicographical_compare_impl(type(first1, first2), last1, last2, comp, 1) sprout::detail::lexicographical_compare_impl(type(first1, first2), last1, last2, comp, 1)
); );
} }
} // namespace detail } // namespace detail
@ -180,65 +120,33 @@ namespace sprout {
namespace detail { namespace detail {
template<typename RandomAccessIterator1, typename T1, typename RandomAccessIterator2, typename T2, typename Compare> template<typename RandomAccessIterator1, typename T1, typename RandomAccessIterator2, typename T2, typename Compare>
inline SPROUT_CONSTEXPR int inline SPROUT_CONSTEXPR int
tristate_lexicographical_compare_2_impl_ra_2( tristate_lexicographical_compare_2_impl_ra(
RandomAccessIterator1 last1, T1 const& delim1, RandomAccessIterator2 last2, T2 const& delim2, Compare comp, RandomAccessIterator1 first1, T1 const& delim1,
sprout::pair<RandomAccessIterator1, RandomAccessIterator2> const& found RandomAccessIterator2 first2, T2 const& delim2,
)
{
return found.second == last2 || (!comp(*found.second, delim2) && !comp(delim2, *found.second))
? (found.first == last1 || (!comp(*found.first, delim1) && !comp(delim1, *found.first)) ? 0 : 1)
: found.first == last1 || (!comp(*found.first, delim1) && !comp(delim1, *found.first)) ? -1
: comp(*found.first, *found.second) ? -1
: comp(*found.second, *found.first) ? 1
: 0
;
}
template<typename RandomAccessIterator1, typename T1, typename RandomAccessIterator2, typename T2, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<RandomAccessIterator1, RandomAccessIterator2>
tristate_lexicographical_compare_2_impl_ra_1(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, T1 const& delim1,
RandomAccessIterator2 first2, RandomAccessIterator2 last2, T2 const& delim2,
Compare comp, Compare comp,
typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot, sprout::pair<RandomAccessIterator1, RandomAccessIterator2> const& found typename std::iterator_traits<RandomAccessIterator1>::difference_type size, int found
) )
{ {
typedef sprout::pair<RandomAccessIterator1, RandomAccessIterator2> found_type; return found != 2 ? found
return found.first != first1 ? found : size == 1
: pivot == 0 ? ( ? !comp(*first2, delim2) && !comp(delim2, *first2)
comp(*first1, *first2) || comp(*first2, *first1) || (!comp(*first1, delim1) && !comp(delim1, *first1)) || (!comp(*first2, delim2) && !comp(delim2, *first2)) ? !comp(*first1, delim1) && !comp(delim1, *first1) ? 0 : 1
? found_type(first1, first2) : found_type(last1, last2) : !comp(*first1, delim1) && !comp(delim1, *first1) || comp(*first1, *first2)
) ? -1
: sprout::detail::tristate_lexicographical_compare_2_impl_ra_1( : comp(*first2, *first1) ? 1 : 2
sprout::next(first1, pivot), last1, delim1, sprout::next(first2, pivot), last2, delim2, comp, : sprout::detail::tristate_lexicographical_compare_2_impl_ra(
(sprout::distance(first1, last1) - pivot) / 2, sprout::next(first1, size / 2), delim1, sprout::next(first2, size / 2), delim2, comp,
sprout::detail::tristate_lexicographical_compare_2_impl_ra_1( size - size / 2,
first1, sprout::next(first1, pivot), delim1, first2, sprout::next(first2, pivot), delim2, comp, sprout::detail::tristate_lexicographical_compare_2_impl_ra(
pivot / 2, first1, delim1, first2, delim2, comp,
found_type(first1, first2) size / 2,
2
) )
) )
; ;
} }
template<typename RandomAccessIterator1, typename T1, typename RandomAccessIterator2, typename T2, typename Compare> template<typename RandomAccessIterator1, typename T1, typename RandomAccessIterator2, typename T2, typename Compare>
inline SPROUT_CONSTEXPR int inline SPROUT_CONSTEXPR int
tristate_lexicographical_compare_2_impl_ra(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, T1 const& delim1,
RandomAccessIterator2 first2, RandomAccessIterator2 last2, T2 const& delim2,
Compare comp,
typename std::iterator_traits<RandomAccessIterator1>::difference_type size
)
{
typedef sprout::pair<RandomAccessIterator1, RandomAccessIterator2> found_type;
return sprout::detail::tristate_lexicographical_compare_2_impl_ra_2(
last1, delim1, last2, delim2, comp,
sprout::detail::tristate_lexicographical_compare_2_impl_ra_1(
first1, sprout::next(first1, size), delim1, first2, sprout::next(first2, size), delim2, comp,
size / 2, found_type(first1, first2)
)
);
}
template<typename RandomAccessIterator1, typename T1, typename RandomAccessIterator2, typename T2, typename Compare>
inline SPROUT_CONSTEXPR int
tristate_lexicographical_compare_2( tristate_lexicographical_compare_2(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, T1 const& delim1, RandomAccessIterator1 first1, RandomAccessIterator1 last1, T1 const& delim1,
RandomAccessIterator2 first2, RandomAccessIterator2 last2, T2 const& delim2, RandomAccessIterator2 first2, RandomAccessIterator2 last2, T2 const& delim2,
@ -246,12 +154,16 @@ namespace sprout {
std::random_access_iterator_tag* std::random_access_iterator_tag*
) )
{ {
return first2 == last2 || (!comp(*first2, delim2) && !comp(delim2, *first2)) ? (first1 == last1 || (!comp(*first1, delim1) && !comp(delim1, *first1)) ? 0 : 1) return sprout::detail::tristate_lexicographical_compare_impl_ra_check(
: first1 == last1 || (!comp(*first1, delim1) && !comp(delim1, *first1)) ? -1 sprout::distance(first1, last1), sprout::distance(first2, last2),
first2 == last2 || first1 == last1
? 2
: sprout::detail::tristate_lexicographical_compare_2_impl_ra( : sprout::detail::tristate_lexicographical_compare_2_impl_ra(
first1, last1, delim1, first2, last2, delim2, comp, first1, delim1, first2, delim2, comp,
NS_SSCRISK_CEL_OR_SPROUT::min(sprout::distance(first1, last1), sprout::distance(first2, last2)) NS_SSCRISK_CEL_OR_SPROUT::min(sprout::distance(first1, last1), sprout::distance(first2, last2)),
2
) )
)
; ;
} }
@ -265,9 +177,11 @@ namespace sprout {
{ {
typedef sprout::pair<InputIterator1, InputIterator2> type; typedef sprout::pair<InputIterator1, InputIterator2> type;
return current.second == last2 || current.first == last1 ? current return current.second == last2 || current.first == last1 ? current
: !comp(*current.second, delim2) && !comp(delim2, *current.second) ? type(!comp(*current.first, delim1) && !comp(delim1, *current.first) ? last1 : current.first, last2) : n == 1
: !comp(*current.first, delim1) && !comp(delim1, *current.first) ? type(last1, current.second) ? !comp(*current.second, delim2) && !comp(delim2, *current.second)
: n == 1 ? comp(*current.first, *current.second) ? type(last1, current.second) ? type(!comp(*current.first, delim1) && !comp(delim1, *current.first) ? last1 : current.first, last2)
: !comp(*current.first, delim1) && !comp(delim1, *current.first) || comp(*current.first, *current.second)
? type(last1, current.second)
: comp(*current.second, *current.first) ? type(current.first, last2) : comp(*current.second, *current.first) ? type(current.first, last2)
: type(sprout::next(current.first), sprout::next(current.second)) : type(sprout::next(current.first), sprout::next(current.second))
: sprout::detail::tristate_lexicographical_compare_impl_1( : sprout::detail::tristate_lexicographical_compare_impl_1(
@ -299,7 +213,7 @@ namespace sprout {
} }
template<typename InputIterator1, typename T1, typename InputIterator2, typename T2, typename Compare> template<typename InputIterator1, typename T1, typename InputIterator2, typename T2, typename Compare>
inline SPROUT_CONSTEXPR int inline SPROUT_CONSTEXPR int
tristate_lexicographical_compare( tristate_lexicographical_compare_2(
InputIterator1 first1, InputIterator1 last1, T1 const& delim1, InputIterator1 first1, InputIterator1 last1, T1 const& delim1,
InputIterator2 first2, InputIterator2 last2, T2 const& delim2, InputIterator2 first2, InputIterator2 last2, T2 const& delim2,
Compare comp, Compare comp,

73
sprout/detail/algorithm/lexicographical_compare.hpp Normal file
View file

@ -0,0 +1,73 @@
#ifndef SPROUT_DETAIL_ALGORITHM_LEXICOGRAPHICAL_COMPARE_HPP
#define SPROUT_DETAIL_ALGORITHM_LEXICOGRAPHICAL_COMPARE_HPP
#include <sprout/config.hpp>
#include <sprout/utility/pair/pair.hpp>
#include <sprout/iterator/next.hpp>
namespace sprout {
namespace detail {
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare>
inline SPROUT_CONSTEXPR int
lexicographical_compare_impl_ra(
RandomAccessIterator1 first1, RandomAccessIterator2 first2, Compare comp,
typename std::iterator_traits<RandomAccessIterator1>::difference_type size,
int found
)
{
return found != 2 ? found
: size == 1 ? comp(*first1, *first2) ? -1 : comp(*first2, *first1) ? 1 : 2
: sprout::detail::lexicographical_compare_impl_ra(
sprout::next(first1, size / 2), sprout::next(first2, size / 2), comp, size - size / 2,
sprout::detail::lexicographical_compare_impl_ra(
first1, first2, comp, size / 2,
2
)
)
;
}
template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2>
lexicographical_compare_impl_1(
sprout::pair<InputIterator1, InputIterator2> const& current,
InputIterator1 last1, InputIterator2 last2, Compare comp,
typename std::iterator_traits<InputIterator1>::difference_type n
)
{
typedef sprout::pair<InputIterator1, InputIterator2> type;
return current.second == last2 || current.first == last1 ? current
: n == 1 ? comp(*current.first, *current.second) ? type(last1, current.second)
: comp(*current.second, *current.first) ? type(current.first, last2)
: type(sprout::next(current.first), sprout::next(current.second))
: sprout::detail::lexicographical_compare_impl_1(
sprout::detail::lexicographical_compare_impl_1(
current,
last1, last2, comp, n / 2
),
last1, last2, comp, n - n / 2
)
;
}
template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2>
lexicographical_compare_impl(
sprout::pair<InputIterator1, InputIterator2> const& current,
InputIterator1 last1, InputIterator2 last2, Compare comp,
typename std::iterator_traits<InputIterator1>::difference_type n
)
{
return current.second == last2 || current.first == last1 ? current
: sprout::detail::lexicographical_compare_impl(
sprout::detail::lexicographical_compare_impl_1(
current,
last1, last2, comp, n
),
last1, last2, comp, n * 2
)
;
}
} // namespace detail
} // namespace sprout
#endif /* #ifndef SPROUT_DETAIL_ALGORITHM_LEXICOGRAPHICAL_COMPARE_HPP */