AdaptedIterator.h

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00001 // -*- C++ -*-
00002 
00008 #if !defined(__ads_iterator_AdaptedIterator_h__)
00009 #define __ads_iterator_AdaptedIterator_h__
00010 
00011 #include "../defs.h"
00012 
00013 #include <iterator>
00014 
00015 BEGIN_NAMESPACE_ADS
00016 
00018 template<typename _Iterator,
00019          typename IteratorCategory,
00020          typename ValueType,
00021          typename DifferenceType,
00022          typename Pointer,
00023          typename Reference>
00024 class AdaptedIterator :
00025   public std::iterator<IteratorCategory,
00026                        ValueType,
00027                        DifferenceType,
00028                        Pointer,
00029                        Reference> {
00030 private:
00031 
00032   //
00033   // Private types.
00034   //
00035 
00036   typedef std::iterator<IteratorCategory,
00037                         ValueType,
00038                         DifferenceType,
00039                         Pointer,
00040                         Reference>
00041   Base;
00042 
00043 public:
00044 
00045   //
00046   // Public types.
00047   //
00048 
00050   typedef _Iterator Iterator;
00051 
00052   // The following five types are required to be defined for any iterator.
00053 
00055   typedef typename Base::iterator_category iterator_category;
00057   typedef typename Base::value_type value_type;
00059   typedef typename Base::difference_type difference_type;
00061   typedef typename Base::pointer pointer;
00063   typedef typename Base::reference reference;
00064 
00065 protected:
00066   
00067   //
00068   // Member data.
00069   //
00070 
00072   Iterator _iterator;
00073 
00074 protected:
00075   
00076   //--------------------------------------------------------------------------
00082 
00084   AdaptedIterator() :
00085     _iterator()
00086   {}
00087 
00089   AdaptedIterator(const AdaptedIterator& x) :
00090     _iterator(x._iterator)
00091   {}
00092 
00094   AdaptedIterator& 
00095   operator=(const AdaptedIterator& other) {
00096     if (&other != this) {
00097       _iterator = other._iterator;
00098     }
00099     return *this;
00100   }
00101 
00103   explicit
00104   AdaptedIterator(const Iterator& i) :
00105     _iterator(i)
00106   {}
00107 
00109   AdaptedIterator& 
00110   operator=(const Iterator& i) {
00111     _iterator = i;
00112     return *this;
00113   }
00114 
00116   ~AdaptedIterator()
00117   {}
00118 
00120 
00121 public:
00122 
00123   //--------------------------------------------------------------------------
00125 
00126 
00128   const Iterator&
00129   base() const {
00130     return _iterator;
00131   }
00132 
00134 };
00135 
00136 
00137 //
00138 // Trivial iterator requirements.
00139 //
00140 
00141 
00143 
00146 template<typename Iterator1, typename IteratorCategory1, typename ValueType1,
00147           typename DifferenceType1, typename Pointer1, typename Reference1,
00148           typename Iterator2, typename IteratorCategory2, typename ValueType2,
00149           typename DifferenceType2, typename Pointer2, typename Reference2>
00150 inline
00151 bool
00152 operator==(const AdaptedIterator<Iterator1,IteratorCategory1,ValueType1,
00153            DifferenceType1,Pointer1,Reference1>& x, 
00154            const AdaptedIterator<Iterator2,IteratorCategory2,ValueType2,
00155            DifferenceType2,Pointer2,Reference2>& y) {
00156   return x.base() == y.base();
00157 }
00158 
00159 
00161 
00164 template<typename Iterator1, typename IteratorCategory1, typename ValueType1,
00165          typename DifferenceType1, typename Pointer1, typename Reference1,
00166          typename Iterator2, typename IteratorCategory2, typename ValueType2,
00167          typename DifferenceType2, typename Pointer2, typename Reference2>
00168 inline
00169 bool
00170 operator!=(const AdaptedIterator<Iterator1,IteratorCategory1,ValueType1,
00171            DifferenceType1,Pointer1,Reference1>& x, 
00172            const AdaptedIterator<Iterator2,IteratorCategory2,ValueType2,
00173            DifferenceType2,Pointer2,Reference2>& y) {
00174   return ! (x == y);
00175 }
00176 
00177 
00178 //
00179 // Random access iterator requirements.
00180 //
00181 
00182 
00184 
00187 template<typename Iterator1, typename IteratorCategory1, typename ValueType1,
00188          typename DifferenceType1, typename Pointer1, typename Reference1,
00189          typename Iterator2, typename IteratorCategory2, typename ValueType2,
00190          typename DifferenceType2, typename Pointer2, typename Reference2>
00191 inline
00192 bool
00193 operator<(const AdaptedIterator<Iterator1,IteratorCategory1,ValueType1,
00194           DifferenceType1,Pointer1,Reference1>& x, 
00195           const AdaptedIterator<Iterator2,IteratorCategory2,ValueType2,
00196           DifferenceType2,Pointer2,Reference2>& y) {
00197   return x.base() < y.base();
00198 }
00199 
00200 
00202 
00205 template<typename Iterator1, typename IteratorCategory1, typename ValueType1,
00206          typename DifferenceType1, typename Pointer1, typename Reference1,
00207          typename Iterator2, typename IteratorCategory2, typename ValueType2,
00208          typename DifferenceType2, typename Pointer2, typename Reference2>
00209 inline
00210 bool
00211 operator>(const AdaptedIterator<Iterator1,IteratorCategory1,ValueType1,
00212           DifferenceType1,Pointer1,Reference1>& x, 
00213           const AdaptedIterator<Iterator2,IteratorCategory2,ValueType2,
00214           DifferenceType2,Pointer2,Reference2>& y) {
00215   return x.base() > y.base();
00216 }
00217 
00218 
00220 
00223 template<typename Iterator1, typename IteratorCategory1, typename ValueType1,
00224          typename DifferenceType1, typename Pointer1, typename Reference1,
00225          typename Iterator2, typename IteratorCategory2, typename ValueType2,
00226          typename DifferenceType2, typename Pointer2, typename Reference2>
00227 inline
00228 bool
00229 operator<=(const AdaptedIterator<Iterator1,IteratorCategory1,ValueType1,
00230            DifferenceType1,Pointer1,Reference1>& x, 
00231            const AdaptedIterator<Iterator2,IteratorCategory2,ValueType2,
00232            DifferenceType2,Pointer2,Reference2>& y) {
00233   return x.base() <= y.base();
00234 }
00235 
00236 
00238 
00241 template<typename Iterator1, typename IteratorCategory1, typename ValueType1,
00242          typename DifferenceType1, typename Pointer1, typename Reference1,
00243          typename Iterator2, typename IteratorCategory2, typename ValueType2,
00244          typename DifferenceType2, typename Pointer2, typename Reference2>
00245 inline
00246 bool
00247 operator>=(const AdaptedIterator<Iterator1,IteratorCategory1,ValueType1,
00248            DifferenceType1,Pointer1,Reference1>& x, 
00249            const AdaptedIterator<Iterator2,IteratorCategory2,ValueType2,
00250            DifferenceType2,Pointer2,Reference2>& y) {
00251   return x.base() >= y.base();
00252 }
00253 
00254 
00256 
00259 template<typename Iterator1, typename IteratorCategory1, typename ValueType1,
00260          typename DifferenceType1, typename Pointer1, typename Reference1,
00261          typename Iterator2, typename IteratorCategory2, typename ValueType2,
00262          typename DifferenceType2, typename Pointer2, typename Reference2>
00263 inline
00264 typename AdaptedIterator<Iterator1,IteratorCategory1,ValueType1,
00265                          DifferenceType1,Pointer1,Reference1>::difference_type
00266 operator-(const AdaptedIterator<Iterator1,IteratorCategory1,ValueType1,
00267           DifferenceType1,Pointer1,Reference1>& x, 
00268           const AdaptedIterator<Iterator2,IteratorCategory2,ValueType2,
00269           DifferenceType2,Pointer2,Reference2>& y) {
00270   return x.base() - y.base();
00271 }
00272 
00273 
00274 END_NAMESPACE_ADS
00275 
00276 #endif
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