fixed_iterator.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2015 John Wellbelove
 
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of this software and associated documentation files(the "Software"), to deal
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******************************************************************************/
 
#ifndef ETL_FIXED_ITERATOR_INCLUDED
#define ETL_FIXED_ITERATOR_INCLUDED
 
#include "platform.h"
#include "iterator.h"

 
namespace etl
{
  template <typename TIterator>
  class fixed_iterator
    : etl::iterator<typename etl::iterator_traits<TIterator>::iterator_category, typename etl::iterator_traits<TIterator>::value_type>
  {
  public:
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator()
      : it(TIterator())
    {
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator(TIterator it_)
      : it(it_)
    {
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator(const fixed_iterator& other)
      : it(other.it)
    {
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator& operator++()
    {
      return *this;
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator operator++(int)
    {
      return *this;
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator& operator--()
    {
      return *this;
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator operator--(int)
    {
      return *this;
    }
 
    //***************************************************************************
    //***************************************************************************
    typename etl::iterator_traits<TIterator>::value_type operator*()
    {
      return *it;
    }
 
    //***************************************************************************
    //***************************************************************************
    const typename etl::iterator_traits<TIterator>::value_type operator*() const
    {
      return *it;
    }
 
    //***************************************************************************
    //***************************************************************************
    TIterator operator->()
    {
      return it;
    }
 
    //***************************************************************************
    //***************************************************************************
    const TIterator operator->() const
    {
      return it;
    }
 
    //***************************************************************************
    //***************************************************************************
    operator TIterator() const
    {
      return it;
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator& operator+=(typename etl::iterator_traits<TIterator>::difference_type /*offset*/)
    {
      return *this;
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator& operator-=(typename etl::iterator_traits<TIterator>::difference_type /*offset*/)
    {
      return *this;
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator& operator=(TIterator new_it)
    {
      it = new_it;
      return *this;
    }
 
    //***************************************************************************
    //***************************************************************************
    fixed_iterator& operator=(fixed_iterator other)
    {
      it = other.it;
      return *this;
    }
 
  private:
 
    TIterator it; 
  };
 
  //*****************************************************************************
  //*****************************************************************************
  template <typename TIterator>
  etl::fixed_iterator<TIterator>& operator+(etl::fixed_iterator<TIterator>& lhs, typename etl::iterator_traits<TIterator>::difference_type /*rhs*/)
  {
    return lhs;
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template <typename TIterator>
  etl::fixed_iterator<TIterator>& operator-(etl::fixed_iterator<TIterator>& lhs, typename etl::iterator_traits<TIterator>::difference_type /*rhs*/)
  {
    return lhs;
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template <typename TIterator>
  typename etl::iterator_traits<TIterator>::difference_type operator-(const etl::fixed_iterator<TIterator>& lhs,
                                                                      const etl::fixed_iterator<TIterator>& rhs)
  {
    return TIterator(lhs) - TIterator(rhs);
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template <typename TIterator>
  bool operator==(const etl::fixed_iterator<TIterator>& lhs, const etl::fixed_iterator<TIterator>& rhs)
  {
    return TIterator(lhs) == TIterator(rhs);
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template <typename TIterator>
  bool operator==(const etl::fixed_iterator<TIterator>& lhs, TIterator rhs)
  {
    return TIterator(lhs) == rhs;
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template <typename TIterator>
  bool operator==(TIterator lhs, const etl::fixed_iterator<TIterator>& rhs)
  {
    return lhs == TIterator(rhs);
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template <typename TIterator>
  bool operator!=(const etl::fixed_iterator<TIterator>& lhs, const etl::fixed_iterator<TIterator>& rhs)
  {
    return !(lhs == rhs);
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template <typename TIterator>
  bool operator!=(const etl::fixed_iterator<TIterator>& lhs, TIterator rhs)
  {
    return !(lhs == rhs);
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template <typename TIterator>
  bool operator!=(TIterator& lhs, const etl::fixed_iterator<TIterator>& rhs)
  {
    return !(lhs == rhs);
  }
} // namespace etl
 
#endif