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sb_iterator.h
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sb_iterator.h
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#ifndef _SB_ITERATOR_H_
#define _SB_ITERATOR_H_
#include "sb_config.h"
namespace sb {
class input_iterator_tag {};
class output_iterator_tag {};
class forward_iterator_tag : public input_iterator_tag{};
class bidirectional_iterator_tag : public forward_iterator_tag {};
class random_access_iterator_tag : public bidirectional_iterator_tag {};
template <typename Type, typename Distance>
class input_iterator {
public:
typedef input_iterator_tag iterator_category;
typedef Type value_type;
typedef Distance difference_type;
typedef Type* pointer;
typedef Type& reference;
};
class output_iterator {
public:
typedef output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
};
template <typename Type, typename Distance>
class forward_iterator {
public:
typedef forward_iterator_tag iterator_category;
typedef Type value_type;
typedef Distance difference_type;
typedef Type* pointer;
typedef Type& reference;
};
template <typename Type, typename Distance>
class bidirectional_iterator {
public:
typedef bidirectional_iterator_tag iterator_category;
typedef Type value_type;
typedef Distance difference_type;
typedef Type* pointer;
typedef Type& reference;
};
template <typename Type, typename Distance>
class random_access_iterator {
public:
typedef random_access_iterator_tag iterator_category;
typedef Type value_type;
typedef Distance difference_type;
typedef Type* pointer;
typedef Type& reference;
};
template <typename Category,
typename Type,
typename Distance = ptrdiff_t,
typename Pointer = Type*,
typename Reference = Type&>
class iterator {
public:
typedef Category iterator_category;
typedef Type value_type;
typedef Distance difference_type;
typedef Pointer pointer;
typedef Reference reference;
};
template <typename Iterator>
class iterator_traits {
public:
typedef typename Iterator::iterator_category iterator_category;
typedef typename Iterator::value_type value_type;
typedef typename Iterator::difference_type difference_type;
typedef typename Iterator::pointer pointer;
typedef typename Iterator::reference reference;
};
template <typename Type>
class iterator_traits<Type *> {
public:
typedef random_access_iterator_tag iterator_category;
typedef Type value_type;
typedef ptrdiff_t difference_type;
typedef Type* pointer;
typedef Type& reference;
};
template <typename Type>
class iterator_traits<const Type *> {
public:
typedef random_access_iterator_tag iterator_category;
typedef Type value_type;
typedef ptrdiff_t difference_type;
typedef const Type* pointer;
typedef const Type& reference;
};
template <typename InputIterator>
inline typename iterator_traits<InputIterator>::difference_type __distance__(InputIterator first, InputIterator last, input_iterator_tag)
{
typename iterator_traits<InputIterator>::difference_type n = 0;
while (first != last) {
first++, n++;
}
return 0;
}
template <typename RandomAccessIterator>
inline typename iterator_traits<RandomAccessIterator>::difference_type __distance__( RandomAccessIterator first, RandomAccessIterator last, random_access_iterator_tag)
{
return last - first;
}
template <typename InputIterator>
inline typename iterator_traits<InputIterator>::difference_type distance(InputIterator first, InputIterator last)
{
return __distance__(first, last, typename iterator_traits<InputIterator>::iterator_category());
}
};
#endif