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