forked from boostorg/iterator
74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
#include <boost/iterator_concepts.hpp>
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#include <boost/operators.hpp>
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struct new_iterator
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: public boost::iterator<std::random_access_iterator_tag, int>,
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public boost::new_iterator_base
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{
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typedef boost::random_access_traversal_tag traversal_category;
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typedef boost::mutable_lvalue_iterator_tag return_category;
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int& operator*() const { return *m_x; }
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new_iterator& operator++() { return *this; }
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new_iterator operator++(int) { return *this; }
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new_iterator& operator--() { return *this; }
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new_iterator operator--(int) { return *this; }
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new_iterator& operator+=(std::ptrdiff_t) { return *this; }
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new_iterator operator+(std::ptrdiff_t) { return *this; }
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new_iterator& operator-=(std::ptrdiff_t) { return *this; }
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std::ptrdiff_t operator-(const new_iterator&) const { return 0; }
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new_iterator operator-(std::ptrdiff_t) const { return *this; }
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bool operator==(const new_iterator&) const { return false; }
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bool operator!=(const new_iterator&) const { return false; }
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bool operator<(const new_iterator&) const { return false; }
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int* m_x;
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};
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new_iterator operator+(std::ptrdiff_t, new_iterator x) { return x; }
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struct old_iterator
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: public boost::iterator<std::random_access_iterator_tag, int>
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{
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int& operator*() const { return *m_x; }
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old_iterator& operator++() { return *this; }
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old_iterator operator++(int) { return *this; }
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old_iterator& operator--() { return *this; }
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old_iterator operator--(int) { return *this; }
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old_iterator& operator+=(std::ptrdiff_t) { return *this; }
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old_iterator operator+(std::ptrdiff_t) { return *this; }
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old_iterator& operator-=(std::ptrdiff_t) { return *this; }
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old_iterator operator-(std::ptrdiff_t) const { return *this; }
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std::ptrdiff_t operator-(const old_iterator&) const { return 0; }
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bool operator==(const old_iterator&) const { return false; }
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bool operator!=(const old_iterator&) const { return false; }
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bool operator<(const old_iterator&) const { return false; }
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int* m_x;
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};
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old_iterator operator+(std::ptrdiff_t, old_iterator x) { return x; }
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int
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main()
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{
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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boost::function_requires<
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boost_concepts::MutableLvalueIteratorConcept<int*> >();
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boost::function_requires<
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boost_concepts::RandomAccessIteratorConcept<int*> >();
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boost::function_requires<
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boost_concepts::ConstantLvalueIteratorConcept<const int*> >();
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boost::function_requires<
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boost_concepts::RandomAccessIteratorConcept<const int*> >();
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#endif
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boost::function_requires<
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boost_concepts::MutableLvalueIteratorConcept<new_iterator> >();
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boost::function_requires<
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boost_concepts::RandomAccessIteratorConcept<new_iterator> >();
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boost::function_requires<
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boost_concepts::MutableLvalueIteratorConcept<old_iterator> >();
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boost::function_requires<
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boost_concepts::RandomAccessIteratorConcept<old_iterator> >();
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return 0;
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}
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