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fix recursion depth: lexicographical_compare

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bolero-MURAKAMI 2012-12-17 00:14:24 +09:00
parent 1c085cb707
commit 750e3b944d
4 changed files with 266 additions and 8 deletions
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160
libs/algorithm/test/lexicographical_compare.cpp Normal file
View file

@ -0,0 +1,160 @@
#ifndef SPROUT_LIBS_ALGORITHM_TEST_LEXICOGRAPHICAL_COMPARE_CPP
#define SPROUT_LIBS_ALGORITHM_TEST_LEXICOGRAPHICAL_COMPARE_CPP
#include <sprout/algorithm/lexicographical_compare.hpp>
#include <sprout/array.hpp>
#include <sprout/container.hpp>
#include <testspr/tools.hpp>
namespace testspr {
static void algorithm_lexicographical_compare_test() {
using namespace sprout;
{
SPROUT_STATIC_CONSTEXPR auto arr1 = array<int, 10>{{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}};
SPROUT_STATIC_CONSTEXPR auto arr2 = array<int, 10>{{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}};
SPROUT_STATIC_CONSTEXPR auto arr3 = array<int, 10>{{1, 2, 3, 4, 5, 6, 7, 1, 2, 3}};
SPROUT_STATIC_CONSTEXPR auto arr4 = array<int, 10>{{1, 2, 3, 4, 5, 6, 7, 11, 12, 13}};
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::end(arr1),
sprout::begin(arr2),
sprout::end(arr2)
);
TESTSPR_BOTH_ASSERT(!result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::end(arr1),
sprout::begin(arr3),
sprout::end(arr3)
);
TESTSPR_BOTH_ASSERT(!result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::end(arr1),
sprout::begin(arr4),
sprout::end(arr4)
);
TESTSPR_BOTH_ASSERT(result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::begin(arr1) + 5,
sprout::begin(arr2),
sprout::end(arr2)
);
TESTSPR_BOTH_ASSERT(result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::begin(arr1) + 5,
sprout::begin(arr3),
sprout::end(arr3)
);
TESTSPR_BOTH_ASSERT(result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::begin(arr1) + 5,
sprout::begin(arr4),
sprout::end(arr4)
);
TESTSPR_BOTH_ASSERT(result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::end(arr1),
sprout::begin(arr2),
sprout::begin(arr2) + 5
);
TESTSPR_BOTH_ASSERT(!result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::end(arr1),
sprout::begin(arr2),
sprout::end(arr2),
testspr::less<int>()
);
TESTSPR_BOTH_ASSERT(!result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::end(arr1),
sprout::begin(arr3),
sprout::end(arr3),
testspr::less<int>()
);
TESTSPR_BOTH_ASSERT(!result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::end(arr1),
sprout::begin(arr4),
sprout::end(arr4),
testspr::less<int>()
);
TESTSPR_BOTH_ASSERT(result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::begin(arr1) + 5,
sprout::begin(arr2),
sprout::end(arr2),
testspr::less<int>()
);
TESTSPR_BOTH_ASSERT(result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::begin(arr1) + 5,
sprout::begin(arr3),
sprout::end(arr3),
testspr::less<int>()
);
TESTSPR_BOTH_ASSERT(result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::begin(arr1) + 5,
sprout::begin(arr4),
sprout::end(arr4),
testspr::less<int>()
);
TESTSPR_BOTH_ASSERT(result);
}
{
SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
sprout::begin(arr1),
sprout::end(arr1),
sprout::begin(arr2),
sprout::begin(arr2) + 5,
testspr::less<int>()
);
TESTSPR_BOTH_ASSERT(!result);
}
}
}
} // namespace testspr
#ifndef TESTSPR_CPP_INCLUDE
# define TESTSPR_TEST_FUNCTION testspr::algorithm_lexicographical_compare_test
# include <testspr/include_main.hpp>
#endif
#endif // #ifndef SPROUT_LIBS_ALGORITHM_TEST_LEXICOGRAPHICAL_COMPARE_CPP

2
libs/algorithm/test/non_modifying.cpp
View file

@ -40,6 +40,7 @@
#include "./min_element.cpp"
#include "./max_element.cpp"
#include "./minmax_element.cpp"
#include "./lexicographical_compare.cpp"
#ifdef TESTSPR_CPP_INCLUDE_DISABLE_SPROUT_LIBS_ALGORITHM_TEST_NON_MODIFYIING_CPP
# undef TESTSPR_CPP_INCLUDE
@ -81,6 +82,7 @@ namespace testspr {
testspr::algorithm_min_element_test();
testspr::algorithm_max_element_test();
testspr::algorithm_minmax_element_test();
testspr::algorithm_lexicographical_compare_test();
}
} // namespace testspr

7
sprout/algorithm/find_end.hpp
View file

@ -107,6 +107,13 @@ namespace sprout {
} // namespace detail
// 25.2.6 Find end
//
// recursion depth:
// [first1, last1) is RandomAccessIterator -> O(log N1)
// otherwise -> O(N1)
// [first2, last2) is RandomAccessIterator -> O(log N2)
// otherwise -> O(N2)
//
template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
inline SPROUT_CONSTEXPR ForwardIterator1
find_end(

105
sprout/algorithm/lexicographical_compare.hpp
View file

@ -3,12 +3,104 @@
#include <sprout/config.hpp>
#include <sprout/iterator/operation.hpp>
#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
#include <sprout/utility/pair.hpp>
#include <sprout/algorithm/min.hpp>
#include <sprout/functional/less.hpp>
#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
namespace sprout {
// Copyright (C) 2011 RiSK (sscrisk)
namespace detail {
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare>
inline SPROUT_CONSTEXPR bool
lexicographical_compare_impl_ra_2(
RandomAccessIterator1 last1, RandomAccessIterator2 last2, Compare comp,
sprout::pair<RandomAccessIterator1, RandomAccessIterator2> const& found
)
{
return found.second == last2 ? false
: 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,
(NS_SSCRISK_CEL_OR_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_ra_2(
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>
inline SPROUT_CONSTEXPR bool
lexicographical_compare(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2, RandomAccessIterator2 last2, Compare comp,
std::random_access_iterator_tag*
)
{
return first2 == last2 ? false
: first1 == last1 ? true
: sprout::detail::lexicographical_compare_impl_ra(
first1, last1, first2, last2, comp,
sprout::min(NS_SSCRISK_CEL_OR_SPROUT::distance(first1, last1), NS_SSCRISK_CEL_OR_SPROUT::distance(first2, last2))
)
;
}
// Copyright (C) 2011 RiSK (sscrisk)
template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR bool
lexicographical_compare_impl(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2, Compare comp) {
return first2 == last2 ? false
: first1 == last1 || comp(*first1, *first2) ? true
: comp(*first2, *first1) ? false
: sprout::detail::lexicographical_compare_impl(sprout::next(first1), last1, sprout::next(first2), last2, comp)
;
}
template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR bool
lexicographical_compare(
InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2, Compare comp,
void*
)
{
return sprout::detail::lexicographical_compare_impl(first1, last1, first2, last2, comp);
}
} //namespace detail
// 25.4.8 Lexicographical comparison
//
// recursion depth:
// [first1, last1), [first2, last2) are RandomAccessIterator -> O(log N)
// otherwise -> O(N)
//
template<typename InputIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR bool
lexicographical_compare(
@ -17,11 +109,8 @@ namespace sprout {
Compare comp
)
{
return first2 == last2 ? false
: first1 == last1 || comp(*first1, *first2) ? true
: comp(*first2, *first1) ? false
: sprout::lexicographical_compare(sprout::next(first1), last1, sprout::next(first2), last2, comp)
;
typedef typename sprout::common_iterator_category<InputIterator1, InputIterator2>::type* category;
return sprout::detail::lexicographical_compare(first1, last1, first2, last2, comp, category());
}
template<typename InputIterator1, typename InputIterator2>
@ -33,7 +122,7 @@ namespace sprout {
{
return sprout::lexicographical_compare(
first1, last1, first2, last2,
NS_SSCRISK_CEL_OR_SPROUT::less<decltype(*first1 + *first2)>()
sprout::less<>()
);
}
} // namespace sprout