forked from boostorg/iterator
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
#ifndef BOOST_ITERATOR_TRAITS_HPP
|
|
#define BOOST_ITERATOR_TRAITS_HPP
|
|
|
|
#include <boost/config.hpp>
|
|
#include <boost/type_traits.hpp>
|
|
|
|
namespace boost {
|
|
|
|
template <typename Iterator>
|
|
struct iterator_traits {
|
|
typedef typename Iterator::value_type value_type;
|
|
typedef typename Iterator::reference reference;
|
|
typedef typename Iterator::pointer pointer;
|
|
typedef typename Iterator::difference_type difference_type;
|
|
typedef typename Iterator::return_category return_category;
|
|
typedef typename Iterator::motion_category motion_category;
|
|
};
|
|
|
|
// Motion Categories
|
|
struct single_pass_iterator_tag { };
|
|
struct forward_iterator_tag : public single_pass_iterator_tag { };
|
|
struct bidirectional_iterator_tag : public forward_iterator_tag { };
|
|
struct random_access_iterator_tag : public bidirectional_iterator_tag { };
|
|
|
|
// Return Type Categories
|
|
struct readable_iterator_tag { };
|
|
struct writable_iterator_tag { };
|
|
struct mutable_lvalue_iterator_tag : virtual public writable_iterator_tag,
|
|
virtual public readable_iterator_tag { };
|
|
struct constant_lvalue_iterator_tag : public readable_iterator_tag { };
|
|
|
|
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
|
|
|
|
namespace detail {
|
|
template <bool IsConst>
|
|
struct pointer_return_category {
|
|
typedef constant_lvalue_iterator_tag type;
|
|
};
|
|
template <>
|
|
struct pointer_return_category<false> {
|
|
typedef mutable_lvalue_iterator_tag type;
|
|
};
|
|
} // namespace detail
|
|
|
|
template <typename T>
|
|
struct iterator_traits<T*> {
|
|
typedef T value_type;
|
|
typedef T& reference;
|
|
typedef T* pointer;
|
|
typedef std::ptrdiff_t difference_type;
|
|
typedef typename detail::pointer_return_category<is_const<T>::value>::type
|
|
return_category;
|
|
typedef random_access_iterator_tag motion_category;
|
|
};
|
|
|
|
#endif
|
|
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_ITERATOR_TRAITS_HPP
|