forwardIterator.h

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#ifndef BALL_LINALG_FORWARDITERATOR_H
#define BALL_LINALG_FORWARDITERATOR_H

#ifndef BALL_LINALG_BASEITERATOR_H
# include <BALL/MATHS/LINALG/baseIterator.h>
#endif

#include <BALL/COMMON/exception.h>
#include <BALL/MATHS/LINALG/linalgException.h>

namespace BALL 
{


  template <typename Container, typename DataType, typename Position, typename Traits>
  class ConstForwardIterator
    : public BaseIterator<Container, DataType, Position, Traits>
  {
    public:
  

    typedef std::forward_iterator_tag iterator_category;
    // convenience typedef
    typedef BaseIterator<Container, DataType, Position, Traits> Base;


    ConstForwardIterator() {}
  
    ConstForwardIterator(const ConstForwardIterator& iterator)
      : BaseIterator<Container, DataType, Position, Traits>(iterator)
    {
    }
      
    ~ConstForwardIterator() {}



    ConstForwardIterator& operator = (const ConstForwardIterator& iterator)
    {
      BaseIterator<Container, DataType, Position, Traits>::operator = (iterator);
      return *this;
    }

    void swap(ConstForwardIterator& iterator) { std::swap(ConstForwardIterator<Container, DataType, Position, Traits>::getTraits(), iterator.getTraits()); }


    void toBegin();

    bool isBegin() const;

    void toEnd();

    bool isEnd() const;

    static ConstForwardIterator begin(const Container& container);

    static ConstForwardIterator end(const Container& container);

    ConstForwardIterator& operator ++ ()
    {
      if (!Base::isValid())
      {
        Exception::InvalidIterator e;
        throw(e);
      }
      Base::getTraits().forward();
      return *this;
    }
    
    ConstForwardIterator operator ++ (int)
    {
      if (!Base::isValid())
      {
        Exception::InvalidIterator e;
        throw(e);
      }
      ConstForwardIterator tmp(*this);
      ++(*this);
      return tmp;
    }
    
    
  protected:
    
    ConstForwardIterator(const Container& container)
      : BaseIterator<Container, DataType, Position, Traits>(container)
    {
    }
  };

  template <typename Container, typename DataType, typename Position, typename Traits>
  void ConstForwardIterator<Container, DataType, Position, Traits>::toBegin()
  {
    if (Base::isSingular())
    {
      Exception::SingularIterator e;
      throw(e);
    }
    Base::getTraits().toBegin();
  }

  template <typename Container, typename DataType, typename Position, typename Traits>
  ConstForwardIterator<Container, DataType, Position, Traits> 
    ConstForwardIterator<Container, DataType, Position, Traits>::begin(const Container& container)
  {
    ConstForwardIterator<Container, DataType, Position, Traits> iterator(container);
    iterator.toBegin();
    return iterator;
  }

  template <typename Container, typename DataType, typename Position, typename Traits>
  bool ConstForwardIterator<Container, DataType, Position, Traits>::isBegin() const
  {
    if (Base::getTraits().isSingular())
    {
      return false;
    }
    return Base::getTraits().isBegin();
  }

  template <typename Container, typename DataType, typename Position, typename Traits>
  void ConstForwardIterator<Container, DataType, Position, Traits>::toEnd()
  {
    if (Base::isSingular())
    {
      Exception::SingularIterator e;
      throw(e);
    }
    Base::getTraits().toEnd();
  }

  template <typename Container, typename DataType, typename Position, typename Traits>
  ConstForwardIterator<Container, DataType, Position, Traits> 
    ConstForwardIterator<Container, DataType, Position, Traits>::end(const Container& container)
  {
    ConstForwardIterator iterator(container);
    iterator.toEnd();
    return iterator;
  }

  template <typename Container, typename DataType, typename Position, typename Traits>
  bool ConstForwardIterator<Container, DataType, Position, Traits>::isEnd() const
  {
    if (Base::isSingular())
    {
      return false;
    }
    return Base::getTraits().isEnd();
  }
      
  template <typename Container, typename DataType, typename Position, typename Traits>
  class ForwardIterator
    : public ConstForwardIterator<Container, DataType, Position, Traits>
  {
    public:


    typedef DataType& reference;
    typedef DataType* pointer;
    // convenience typedef    
    typedef ConstForwardIterator<Container, DataType, Position, Traits> Base;


    ForwardIterator() {}
  
    ForwardIterator(const ForwardIterator& iterator)
      : ConstForwardIterator<Container, DataType, Position, Traits>(iterator)
    {
    }

    ~ForwardIterator() {}     


    ForwardIterator& operator = (const ForwardIterator& iterator)
    {
      ConstForwardIterator<Container, DataType, Position, Traits>::operator = (iterator);
      return *this;
    }

    void swap(ForwardIterator& iterator) { std::swap(Base::getTraits(), iterator.getTraits()); }


    static ForwardIterator begin(const Container& container);

    static ForwardIterator end(const Container& container);

    reference operator * () const
    { 
      return (reference)Base::getTraits().getData(); 
    }

    pointer operator -> () const
    { 
      return (pointer)&Base::getTraits().getData(); 
    }

    ForwardIterator& operator ++ ()
    {
      if (!Base::isValid())
      {
        Exception::InvalidIterator e;
        throw(e);
      }
        Base::getTraits().forward();
      return *this;
    }
    
    ForwardIterator operator ++ (int)
    {
      if (!Base::isValid())
      {
        Exception::InvalidIterator e;
        throw(e);
      }
        ForwardIterator tmp(*this);
      ++(*this);
      return tmp;
    }


    protected:

    ForwardIterator(const Container& container)
      : Base(container)
    {
    }
  };


  template <typename Container, typename DataType, typename Position, typename Traits>
  ForwardIterator<Container, DataType, Position, Traits> 
    ForwardIterator<Container, DataType, Position, Traits>::begin(const Container& container)
  {
    ForwardIterator iterator(container);
    iterator.toBegin();
    return iterator;
  }

  template <typename Container, typename DataType, typename Position, typename Traits>
  ForwardIterator<Container, DataType, Position, Traits> 
    ForwardIterator<Container, DataType, Position, Traits>::end(const Container& container)
  {
    ForwardIterator iterator(container);
    iterator.toEnd();
    return iterator;
  }


} // namespace BALL

#endif // BALL_KERNEL_FORWARDITERATOR_H

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