- import libcxx - reduce targets to the one when compiled as a tools Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
296 lines
8.7 KiB
C++
296 lines
8.7 KiB
C++
#ifndef ITERATORS_H
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#define ITERATORS_H
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#include <iterator>
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template <class It>
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class output_iterator
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{
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It it_;
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template <class U> friend class output_iterator;
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public:
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typedef std::output_iterator_tag iterator_category;
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typedef void value_type;
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typedef typename std::iterator_traits<It>::difference_type difference_type;
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typedef It pointer;
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typedef typename std::iterator_traits<It>::reference reference;
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It base() const {return it_;}
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output_iterator () {}
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explicit output_iterator(It it) : it_(it) {}
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template <class U>
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output_iterator(const output_iterator<U>& u) :it_(u.it_) {}
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reference operator*() const {return *it_;}
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output_iterator& operator++() {++it_; return *this;}
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output_iterator operator++(int)
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{output_iterator tmp(*this); ++(*this); return tmp;}
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};
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template <class It>
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class input_iterator
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{
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It it_;
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template <class U> friend class input_iterator;
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public:
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typedef std::input_iterator_tag iterator_category;
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typedef typename std::iterator_traits<It>::value_type value_type;
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typedef typename std::iterator_traits<It>::difference_type difference_type;
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typedef It pointer;
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typedef typename std::iterator_traits<It>::reference reference;
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It base() const {return it_;}
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input_iterator() : it_() {}
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explicit input_iterator(It it) : it_(it) {}
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template <class U>
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input_iterator(const input_iterator<U>& u) :it_(u.it_) {}
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reference operator*() const {return *it_;}
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pointer operator->() const {return it_;}
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input_iterator& operator++() {++it_; return *this;}
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input_iterator operator++(int)
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{input_iterator tmp(*this); ++(*this); return tmp;}
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friend bool operator==(const input_iterator& x, const input_iterator& y)
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{return x.it_ == y.it_;}
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friend bool operator!=(const input_iterator& x, const input_iterator& y)
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{return !(x == y);}
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};
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template <class T, class U>
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inline
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bool
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operator==(const input_iterator<T>& x, const input_iterator<U>& y)
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{
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return x.base() == y.base();
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}
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template <class T, class U>
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inline
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bool
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operator!=(const input_iterator<T>& x, const input_iterator<U>& y)
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{
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return !(x == y);
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}
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template <class It>
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class forward_iterator
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{
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It it_;
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template <class U> friend class forward_iterator;
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public:
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typedef std::forward_iterator_tag iterator_category;
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typedef typename std::iterator_traits<It>::value_type value_type;
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typedef typename std::iterator_traits<It>::difference_type difference_type;
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typedef It pointer;
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typedef typename std::iterator_traits<It>::reference reference;
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It base() const {return it_;}
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forward_iterator() : it_() {}
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explicit forward_iterator(It it) : it_(it) {}
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template <class U>
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forward_iterator(const forward_iterator<U>& u) :it_(u.it_) {}
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reference operator*() const {return *it_;}
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pointer operator->() const {return it_;}
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forward_iterator& operator++() {++it_; return *this;}
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forward_iterator operator++(int)
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{forward_iterator tmp(*this); ++(*this); return tmp;}
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friend bool operator==(const forward_iterator& x, const forward_iterator& y)
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{return x.it_ == y.it_;}
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friend bool operator!=(const forward_iterator& x, const forward_iterator& y)
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{return !(x == y);}
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};
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template <class T, class U>
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inline
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bool
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operator==(const forward_iterator<T>& x, const forward_iterator<U>& y)
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{
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return x.base() == y.base();
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}
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template <class T, class U>
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inline
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bool
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operator!=(const forward_iterator<T>& x, const forward_iterator<U>& y)
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{
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return !(x == y);
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}
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template <class It>
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class bidirectional_iterator
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{
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It it_;
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template <class U> friend class bidirectional_iterator;
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public:
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typedef std::bidirectional_iterator_tag iterator_category;
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typedef typename std::iterator_traits<It>::value_type value_type;
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typedef typename std::iterator_traits<It>::difference_type difference_type;
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typedef It pointer;
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typedef typename std::iterator_traits<It>::reference reference;
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It base() const {return it_;}
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bidirectional_iterator() : it_() {}
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explicit bidirectional_iterator(It it) : it_(it) {}
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template <class U>
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bidirectional_iterator(const bidirectional_iterator<U>& u) :it_(u.it_) {}
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reference operator*() const {return *it_;}
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pointer operator->() const {return it_;}
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bidirectional_iterator& operator++() {++it_; return *this;}
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bidirectional_iterator operator++(int)
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{bidirectional_iterator tmp(*this); ++(*this); return tmp;}
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bidirectional_iterator& operator--() {--it_; return *this;}
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bidirectional_iterator operator--(int)
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{bidirectional_iterator tmp(*this); --(*this); return tmp;}
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};
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template <class T, class U>
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inline
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bool
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operator==(const bidirectional_iterator<T>& x, const bidirectional_iterator<U>& y)
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{
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return x.base() == y.base();
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}
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template <class T, class U>
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inline
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bool
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operator!=(const bidirectional_iterator<T>& x, const bidirectional_iterator<U>& y)
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{
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return !(x == y);
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}
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template <class It>
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class random_access_iterator
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{
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It it_;
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template <class U> friend class random_access_iterator;
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public:
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typedef std::random_access_iterator_tag iterator_category;
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typedef typename std::iterator_traits<It>::value_type value_type;
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typedef typename std::iterator_traits<It>::difference_type difference_type;
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typedef It pointer;
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typedef typename std::iterator_traits<It>::reference reference;
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It base() const {return it_;}
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random_access_iterator() : it_() {}
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explicit random_access_iterator(It it) : it_(it) {}
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template <class U>
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random_access_iterator(const random_access_iterator<U>& u) :it_(u.it_) {}
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reference operator*() const {return *it_;}
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pointer operator->() const {return it_;}
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random_access_iterator& operator++() {++it_; return *this;}
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random_access_iterator operator++(int)
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{random_access_iterator tmp(*this); ++(*this); return tmp;}
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random_access_iterator& operator--() {--it_; return *this;}
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random_access_iterator operator--(int)
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{random_access_iterator tmp(*this); --(*this); return tmp;}
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random_access_iterator& operator+=(difference_type n) {it_ += n; return *this;}
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random_access_iterator operator+(difference_type n) const
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{random_access_iterator tmp(*this); tmp += n; return tmp;}
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friend random_access_iterator operator+(difference_type n, random_access_iterator x)
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{x += n; return x;}
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random_access_iterator& operator-=(difference_type n) {return *this += -n;}
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random_access_iterator operator-(difference_type n) const
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{random_access_iterator tmp(*this); tmp -= n; return tmp;}
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reference operator[](difference_type n) const {return it_[n];}
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};
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template <class T, class U>
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inline
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bool
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operator==(const random_access_iterator<T>& x, const random_access_iterator<U>& y)
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{
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return x.base() == y.base();
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}
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template <class T, class U>
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inline
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bool
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operator!=(const random_access_iterator<T>& x, const random_access_iterator<U>& y)
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{
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return !(x == y);
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}
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template <class T, class U>
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inline
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bool
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operator<(const random_access_iterator<T>& x, const random_access_iterator<U>& y)
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{
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return x.base() < y.base();
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}
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template <class T, class U>
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inline
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bool
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operator<=(const random_access_iterator<T>& x, const random_access_iterator<U>& y)
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{
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return !(y < x);
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}
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template <class T, class U>
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inline
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bool
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operator>(const random_access_iterator<T>& x, const random_access_iterator<U>& y)
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{
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return y < x;
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}
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template <class T, class U>
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inline
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bool
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operator>=(const random_access_iterator<T>& x, const random_access_iterator<U>& y)
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{
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return !(x < y);
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}
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template <class T, class U>
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inline
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typename std::iterator_traits<T>::difference_type
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operator-(const random_access_iterator<T>& x, const random_access_iterator<U>& y)
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{
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return x.base() - y.base();
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}
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template <class Iter>
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inline Iter base(output_iterator<Iter> i) { return i.base(); }
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template <class Iter>
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inline Iter base(input_iterator<Iter> i) { return i.base(); }
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template <class Iter>
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inline Iter base(forward_iterator<Iter> i) { return i.base(); }
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template <class Iter>
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inline Iter base(bidirectional_iterator<Iter> i) { return i.base(); }
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template <class Iter>
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inline Iter base(random_access_iterator<Iter> i) { return i.base(); }
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template <class Iter> // everything else
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inline Iter base(Iter i) { return i; }
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#endif // ITERATORS_H
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