utils.h

   1 #ifndef _UTILS_H_
   2 #define _UTILS_H_
   3
   4 #include <vector>
   5
   6 /**
   7  * Iterator for vectors containing pointers to Type.
   8  * Attention: Dereferenced iterator returns copy of the Type
   9  *            (not pointer to Type)!
  10  * For usage it should be enough to public inherit from this class and
  11  * declare some friend methods (functions).
  12  * Example:
  13  *
  14  * class Cl{
  15  *   public:
  16  *     class iterator;
  17  *
  18  *     iterator begin() const;
  19  *     iterator end() const;
  20  *
  21  *     class iterator : public VectorPointerIterator<QString>{
  22  *       public:
  23  *         friend iterator Cl::begin() const;
  24  *         friend iterator Cl::end() const;
  25  *     };
  26  * };
  27  *
  28  */
  29 template<class Type>
  30 class VectorPointerIterator{
  31   protected:
  32     typedef typename std::vector<Type *>::const_iterator iterator_t;
  33     iterator_t it;
  34
  35   public:
  36     VectorPointerIterator(){}
  37     VectorPointerIterator(const VectorPointerIterator &iter) : it(iter.it){}
  38     virtual VectorPointerIterator
  39         &operator=(const VectorPointerIterator& iter)
  40             { it = iter.it; return *this; }
  41     virtual bool
  42         operator==(const VectorPointerIterator& iter){ return it == iter.it; }
  43     virtual bool
  44         operator!=(const VectorPointerIterator& iter){ return it != iter.it; }
  45     virtual VectorPointerIterator &operator++(){ it++; return *this; }
  46     virtual VectorPointerIterator &operator++(int){ it++; return *this; }
  47     virtual VectorPointerIterator &operator--(){ it--; return *this; }
  48     virtual VectorPointerIterator &operator--(int){ it--; return *this; }
  49     virtual Type operator*() const{ return **it; }
  50 };
  51 #endif