添加reverse_iterator
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邹晓航
184
TinySTL/ReverseIterator.h
Normal file
184
TinySTL/ReverseIterator.h
Normal file
@@ -0,0 +1,184 @@
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#ifndef _REVERSE_ITERATOR_H_
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#define _REVERSE_ITERATOR_H_
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#include "Iterator.h"
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namespace TinySTL{
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template<class Iterator>
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class reverse_iterator{
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public:
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typedef Iterator iterator_type;
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typedef typename iterator_traits<Iterator>::iterator_category iterator_category;
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typedef typename iterator_traits<Iterator>::value_type value_type;
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typedef typename iterator_traits<Iterator>::difference_type difference_type;
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typedef typename iterator_traits<Iterator>::pointer pointer;
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typedef typename iterator_traits<Iterator>::reference reference;
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private:
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Iterator base_;
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Iterator cur_;
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public:
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//<2F><><EFBFBD>졣<EFBFBD><ECA1A3><EFBFBD>ƣ<EFBFBD><C6A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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reverse_iterator() :base_(0), cur_(0){}
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explicit reverse_iterator(iterator_type it) :base_(it), cur_(base_ - 1){}
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template <class Iter>
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reverse_iterator(const reverse_iterator<Iter>& rev_it){
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base_ = (iterator_type)rev_it.base();
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cur_ = base_ - 1;
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};
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><D4B1><EFBFBD><EFBFBD>
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iterator_type base() const{ return base_; }
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reference operator*() const{ return (*cur_); }
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pointer operator->() const{ return &(operator *()); }
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reverse_iterator& operator ++(){
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--base_;
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--cur_;
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return *this;
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}
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reverse_iterator& operator ++(int){
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reverse_iterator temp = *this;
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++(*this);
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return temp;
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}
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reverse_iterator& operator--(){
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++base_;
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++cur_;
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return *this;
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}
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reverse_iterator operator--(int){
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reverse_iterator temp = *this;
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--(*this);
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return temp;
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}
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reference operator[] (difference_type n) const{
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return base()[-n - 1];
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}
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reverse_iterator operator + (difference_type n) const;
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reverse_iterator& operator += (difference_type n);
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reverse_iterator operator - (difference_type n) const;
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reverse_iterator& operator -= (difference_type n);
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private:
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Iterator advanceNStep(Iterator it,
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difference_type n,
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bool right,//true -> \ false <-
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random_access_iterator_tag){
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if (right){
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it += n;
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}else{
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it -= n;
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}
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return it;
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}
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Iterator advanceNStep(Iterator it,
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difference_type n,
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bool right,//true -> \ false <-
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bidirectional_iterator_tag){
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difference_type i;
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difference_type absN = n >= 0 ? n : -n;
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if ((right && n > 0) || (!right && n < 0)){// ->
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for (i = 0; i != absN; ++i){
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it = it + 1;
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}
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}
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else if ((!right && n > 0) || (right && n < 0)){// <-
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for (i = 0; i != absN; ++i){
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it = it - 1;
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}
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}
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return it;
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}
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public:
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template <class Iterator>
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friend bool operator == (const reverse_iterator<Iterator>& lhs,
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const reverse_iterator<Iterator>& rhs);
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template <class Iterator>
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friend bool operator != (const reverse_iterator<Iterator>& lhs,
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const reverse_iterator<Iterator>& rhs);
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template <class Iterator>
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friend bool operator < (const reverse_iterator<Iterator>& lhs,
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const reverse_iterator<Iterator>& rhs);
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template <class Iterator>
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friend bool operator <= (const reverse_iterator<Iterator>& lhs,
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const reverse_iterator<Iterator>& rhs);
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template <class Iterator>
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friend bool operator > (const reverse_iterator<Iterator>& lhs,
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const reverse_iterator<Iterator>& rhs);
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template <class Iterator>
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friend bool operator >= (const reverse_iterator<Iterator>& lhs,
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const reverse_iterator<Iterator>& rhs);
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template <class Iterator>
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friend reverse_iterator<Iterator> operator + (
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typename reverse_iterator<Iterator>::difference_type n,
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const reverse_iterator<Iterator>& rev_it);
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template <class Iterator>
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friend typename reverse_iterator<Iterator>::difference_type operator- (
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const reverse_iterator<Iterator>& lhs,
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const reverse_iterator<Iterator>& rhs);
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};// end of reverse_iterator
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template<class Iterator>
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reverse_iterator<Iterator>& reverse_iterator<Iterator>::operator += (difference_type n){
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base_ = advanceNStep(base_, n, false, iterator_category());
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cur_ = advanceNStep(cur_, n, false, iterator_category());
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return *this;
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}
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template<class Iterator>
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reverse_iterator<Iterator>& reverse_iterator<Iterator>::operator -= (difference_type n){
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base_ = advanceNStep(base_, n, true, iterator_category());
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cur_ = advanceNStep(cur_, n, true, iterator_category());
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return *this;
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}
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template<class Iterator>
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reverse_iterator<Iterator> reverse_iterator<Iterator>::operator + (difference_type n) const{
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reverse_iterator<Iterator> res = *this;
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res += n;
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return res;
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}
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template<class Iterator>
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reverse_iterator<Iterator> reverse_iterator<Iterator>::operator - (difference_type n) const{
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reverse_iterator<Iterator> res = *this;
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res -= n;
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return res;
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}
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template <class Iterator>
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bool operator == (const reverse_iterator<Iterator>& lhs, const reverse_iterator<Iterator>& rhs){
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return lhs.cur_ == rhs.cur_;
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}
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template <class Iterator>
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bool operator != (const reverse_iterator<Iterator>& lhs, const reverse_iterator<Iterator>& rhs){
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return !(lhs == rhs);
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}
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template <class Iterator>
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bool operator < (const reverse_iterator<Iterator>& lhs, const reverse_iterator<Iterator>& rhs){
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return lhs.cur_ < rhs.cur_;
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}
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template <class Iterator>
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bool operator > (const reverse_iterator<Iterator>& lhs, const reverse_iterator<Iterator>& rhs){
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return lhs.cur_ > rhs.cur_;
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}
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template <class Iterator>
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bool operator >= (const reverse_iterator<Iterator>& lhs, const reverse_iterator<Iterator>& rhs){
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return !(lhs < rhs);
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}
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template <class Iterator>
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bool operator <= (const reverse_iterator<Iterator>& lhs, const reverse_iterator<Iterator>& rhs){
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return !(lhs > rhs);
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}
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template <class Iterator>
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reverse_iterator<Iterator> operator + (
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typename reverse_iterator<Iterator>::difference_type n,
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const reverse_iterator<Iterator>& rev_it){
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return rev_it + n;
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}
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template <class Iterator>
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typename reverse_iterator<Iterator>::difference_type operator - (
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const reverse_iterator<Iterator>& lhs,
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const reverse_iterator<Iterator>& rhs){
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return lhs.cur_ - rhs.cur_;
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}
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}
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#endif
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@@ -86,6 +86,8 @@
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<ClInclude Include="Construct.h" />
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<ClInclude Include="Iterator.h" />
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<ClInclude Include="Profiler\Profiler.h" />
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<ClInclude Include="ReverseIterator.h" />
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<ClInclude Include="String.h" />
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<ClInclude Include="TypeTraits.h" />
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<ClInclude Include="UninitializedFunctions.h" />
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<ClInclude Include="Vector.h" />
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@@ -53,5 +53,11 @@
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<ClInclude Include="Profiler\Profiler.h">
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<Filter>头文件\Profiler</Filter>
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</ClInclude>
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<ClInclude Include="String.h">
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<Filter>头文件</Filter>
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</ClInclude>
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<ClInclude Include="ReverseIterator.h">
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<Filter>头文件</Filter>
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</ClInclude>
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</ItemGroup>
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</Project>
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