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fix next, prev

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bolero-MURAKAMI 2012-12-12 17:46:36 +09:00
parent 75228465fe
commit cf9f6670b6
18 changed files with 243 additions and 0 deletions
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78
sprout/iterator/next.hpp
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@ -3,7 +3,10 @@
#include <iterator>
#include <type_traits>
#include <stdexcept>
#include <sprout/config.hpp>
#include <sprout/iterator/next_fwd.hpp>
#include <sprout/iterator/prev_fwd.hpp>
#include <sprout/adl/not_found.hpp>
namespace sprout_adl {
@ -38,8 +41,71 @@ namespace sprout {
{
return it + n;
}
template<typename BidirectionalIterator>
inline SPROUT_CONSTEXPR BidirectionalIterator
next_impl_2_neg(BidirectionalIterator const& it, typename std::iterator_traits<BidirectionalIterator>::difference_type n) {
return n == -1 ? sprout::prev(it)
: sprout::iterator_detail::next_impl_2_neg(
sprout::iterator_detail::next_impl_2_neg(it, n / 2),
n - (n / 2)
)
;
}
template<typename ForwardIterator>
inline SPROUT_CONSTEXPR ForwardIterator
next_impl_2(ForwardIterator const& it, typename std::iterator_traits<ForwardIterator>::difference_type n) {
return n == 1 ? sprout::next(it)
: sprout::iterator_detail::next_impl_2(
sprout::iterator_detail::next_impl_2(it, n / 2),
n - (n / 2)
)
;
}
template<typename BidirectionalIterator>
inline SPROUT_CONSTEXPR BidirectionalIterator
next_impl_1(
BidirectionalIterator const& it, typename std::iterator_traits<BidirectionalIterator>::difference_type n,
std::bidirectional_iterator_tag*
)
{
return n == 0 ? it
: n > 0 ? sprout::iterator_detail::next_impl_2(it, n)
: sprout::iterator_detail::next_impl_2_neg(it, n)
;
}
template<typename ForwardIterator>
inline SPROUT_CONSTEXPR ForwardIterator
next_impl_1(
ForwardIterator const& it, typename std::iterator_traits<ForwardIterator>::difference_type n,
void*
)
{
return n == 0 ? it
: n > 0 ? sprout::iterator_detail::next_impl_2(it, n)
: throw std::domain_error("next: nagative distance is invalid ForwardIterator")
;
}
template<typename ForwardIterator>
inline SPROUT_CONSTEXPR typename std::enable_if<
std::is_literal_type<ForwardIterator>::value,
ForwardIterator
>::type
next_impl(
ForwardIterator const& it, typename std::iterator_traits<ForwardIterator>::difference_type n,
void*
)
{
typedef typename std::iterator_traits<ForwardIterator>::iterator_category* category;
return sprout::iterator_detail::next_impl_1(it, n, category());
}
template<typename ForwardIterator>
inline SPROUT_CONSTEXPR typename std::enable_if<
!std::is_literal_type<ForwardIterator>::value,
ForwardIterator
>::type
next_impl(
ForwardIterator const& it, typename std::iterator_traits<ForwardIterator>::difference_type n,
void*
@ -84,11 +150,23 @@ namespace sprout {
//
// next
//
// effect:
// ADL callable iterator_next(it) -> iterator_next(it)
// it is RandomAccessIterator && LiteralType -> it + 1
// otherwise -> std::next(it)
//
template<typename ForwardIterator>
inline SPROUT_CONSTEXPR ForwardIterator
next(ForwardIterator const& it) {
return sprout_iterator_detail::next(it);
}
//
// effect:
// ADL callable iterator_next(it, n) -> iterator_next(it, n)
// it is RandomAccessIterator && LiteralType -> it + n
// it is LiteralType -> sprout::next(it)... || sprout::prev(it)...
// otherwise -> std::next(it, n)
//
template<typename ForwardIterator>
inline SPROUT_CONSTEXPR ForwardIterator
next(ForwardIterator const& it, typename std::iterator_traits<ForwardIterator>::difference_type n) {