iterator.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2017 John Wellbelove
 
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******************************************************************************/
 
#ifndef ETL_ITERATOR_INCLUDED
#define ETL_ITERATOR_INCLUDED
 
#include "platform.h"
#include "type_traits.h"
#include "utility.h"
#include "private/addressof.h"
 
#if ETL_USING_STL || defined(ETL_IN_UNIT_TEST)
  #include <iterator>
#endif

 
namespace etl
{
  //***************************************************************************
  // iterator tags
  struct input_iterator_tag {};
  struct output_iterator_tag {};
  struct forward_iterator_tag : public input_iterator_tag {};
  struct bidirectional_iterator_tag : public forward_iterator_tag {};
  struct random_access_iterator_tag : public bidirectional_iterator_tag {};
  //struct contiguous_iterator_tag : public random_access_iterator_tag {};
 
  //***************************************************************************
  // iterator_traits
 
  // For anything not a fundamental type.
  template <typename TIterator, typename = typename etl::enable_if<!etl::is_fundamental<TIterator>::value, void>::type>
  struct iterator_traits
  {
    typedef typename TIterator::iterator_category iterator_category;
    typedef typename TIterator::value_type        value_type;
    typedef typename TIterator::difference_type   difference_type;
    typedef typename TIterator::pointer           pointer;
    typedef typename TIterator::reference         reference;
  };
 
  // For pointers.
  template <typename T>
  struct iterator_traits<T*, void>
  {
    typedef ETL_OR_STD::random_access_iterator_tag iterator_category;
    typedef T                                      value_type;
    typedef ptrdiff_t                              difference_type;
    typedef typename etl::remove_cv<T>::type*      pointer;
    typedef T&                                     reference;
  };
 
  // For const pointers.
  template <typename T>
  struct iterator_traits<const T*, void>
  {
    typedef ETL_OR_STD::random_access_iterator_tag  iterator_category;
    typedef T                                       value_type;
    typedef ptrdiff_t                               difference_type;
    typedef const typename etl::remove_cv<T>::type* pointer;
    typedef const T&                                reference;
  };
 
  //***************************************************************************
  // advance
  template <typename TIterator, typename TDistance>
  ETL_CONSTEXPR14 void advance_helper(TIterator& itr, TDistance n, ETL_OR_STD::output_iterator_tag)
  {
    while (n--)
    {
      ++itr;
    }
  }
 
  template <typename TIterator, typename TDistance>
  ETL_CONSTEXPR14 void advance_helper(TIterator& itr, TDistance n, ETL_OR_STD::forward_iterator_tag)
  {
    while (n--)
    {
      ++itr;
    }
  }
 
  template <typename TIterator, typename TDistance>
  ETL_CONSTEXPR14 void advance_helper(TIterator& itr, TDistance n, ETL_OR_STD::bidirectional_iterator_tag)
  {
    if (n > 0)
    {
      while (n--)
      {
        ++itr;
      }
    }
    else
    {
      while (n++)
      {
        --itr;
      }
    }
  }
 
  template <typename TIterator, typename TDistance>
  ETL_CONSTEXPR14 void advance_helper(TIterator& itr, TDistance n, ETL_OR_STD::random_access_iterator_tag)
  {
    itr += n;
  }
 
  template <typename TIterator, typename TDistance>
  ETL_CONSTEXPR14 void advance(TIterator& itr, TDistance n)
  {
    typedef typename etl::iterator_traits<TIterator>::iterator_category tag;
 
    advance_helper(itr, n, tag());
  }
 
  //***************************************************************************
  // distance
  template<typename TIterator>
  ETL_CONSTEXPR14 typename etl::iterator_traits<TIterator>::difference_type distance_helper(TIterator first, TIterator last, ETL_OR_STD::input_iterator_tag)
  {
    typename etl::iterator_traits<TIterator>::difference_type d = 0;
 
    while (first != last)
    {
      ++d;
      ++first;
    }
 
    return d;
  }
 
  template<typename TIterator>
  ETL_CONSTEXPR14 typename etl::iterator_traits<TIterator>::difference_type distance_helper(TIterator first, TIterator last, ETL_OR_STD::forward_iterator_tag)
  {
    typename etl::iterator_traits<TIterator>::difference_type d = 0;
 
    while (first != last)
    {
      ++d;
      ++first;
    }
 
    return d;
  }
 
  template<typename TIterator>
  ETL_CONSTEXPR14 typename etl::iterator_traits<TIterator>::difference_type distance_helper(TIterator first, TIterator last, ETL_OR_STD::bidirectional_iterator_tag)
  {
    typename etl::iterator_traits<TIterator>::difference_type d = 0;
 
    while (first != last)
    {
      ++d;
      ++first;
    }
 
    return d;
  }
 
  template<typename TIterator>
  ETL_CONSTEXPR14 typename etl::iterator_traits<TIterator>::difference_type distance_helper(TIterator first, TIterator last, ETL_OR_STD::random_access_iterator_tag)
  {
    return last - first;
  }
 
  template<typename TIterator>
  ETL_CONSTEXPR14 typename etl::iterator_traits<TIterator>::difference_type distance(TIterator first, TIterator last)
  {
    typedef typename etl::iterator_traits<TIterator>::iterator_category tag;
 
    return distance_helper(first, last, tag());
  }
 
  //***************************************************************************
  // Previous
  template<typename TIterator>
  ETL_CONSTEXPR14 TIterator prev(TIterator itr, typename etl::iterator_traits<TIterator>::difference_type n = 1)
  {
    etl::advance(itr, -n);
 
    return itr;
  }
 
  //***************************************************************************
  // Next
  template<typename TIterator>
  ETL_CONSTEXPR14 TIterator next(TIterator itr, typename etl::iterator_traits<TIterator>::difference_type n = 1)
  {
    etl::advance(itr, n);
 
    return itr;
  }
 
  //***************************************************************************
  // reverse_iterator
  template <typename TIterator>
  class reverse_iterator
  {
  public:
 
    typedef typename iterator_traits<TIterator>::iterator_category iterator_category;
    typedef typename iterator_traits<TIterator>::value_type        value_type;
    typedef typename iterator_traits<TIterator>::difference_type   difference_type;
    typedef typename iterator_traits<TIterator>::pointer           pointer;
    typedef typename iterator_traits<TIterator>::reference         reference;
 
    typedef TIterator iterator_type;
 
    ETL_CONSTEXPR14 reverse_iterator()
      : current()
    {
    }
 
    ETL_CONSTEXPR14 explicit reverse_iterator(TIterator itr)
      : current(itr)
    {
    }
 
    template <typename TOther>
    ETL_CONSTEXPR14 reverse_iterator(const reverse_iterator<TOther>& other)
      : current(other.base())
    {
    }
 
    template<class TOther>
    ETL_CONSTEXPR14 reverse_iterator& operator =(const reverse_iterator<TOther>& other)
    {
      current = other.base();
 
      return (*this);
    }
 
    ETL_CONSTEXPR14 TIterator base() const
    {
      return current;
    }
 
    ETL_NODISCARD ETL_CONSTEXPR14 reference operator*() const
    {
      TIterator temp = current;
 
      return *(--temp);
    }
 
    ETL_NODISCARD ETL_CONSTEXPR14 pointer operator->() const
    {
      TIterator temp = current;
 
      return &(*--temp);
    }
 
    ETL_CONSTEXPR14 reverse_iterator& operator++()
    {
      --current;
 
      return *this;
    }
 
    ETL_CONSTEXPR14 reverse_iterator operator++(int)
    {
      reverse_iterator temp = *this;
      --current;
 
      return temp;
    }
 
    ETL_CONSTEXPR14 reverse_iterator& operator--()
    {
      ++current;
 
      return (*this);
    }
 
    ETL_CONSTEXPR14 reverse_iterator operator--(int)
    {
      reverse_iterator temp = *this;
      ++current;
 
      return temp;
    }
 
    ETL_CONSTEXPR14 reverse_iterator& operator+=(const difference_type offset)
    {
      current -= offset;
 
      return (*this);
    }
 
    ETL_CONSTEXPR14 reverse_iterator& operator-=(const difference_type offset)
    {
      current += offset;
 
      return (*this);
    }
 
    ETL_NODISCARD ETL_CONSTEXPR14 reverse_iterator operator+(const difference_type offset) const
    {
      return reverse_iterator(current - offset);
    }
 
    ETL_NODISCARD ETL_CONSTEXPR14 reverse_iterator operator-(const difference_type offset) const
    {
      return (reverse_iterator(current + offset));
    }
 
    ETL_NODISCARD ETL_CONSTEXPR14 reference operator[](const difference_type offset) const
    {
      return (*(*this + offset));
    }
 
  protected:
 
    TIterator current;
  };
 
  template <typename TIterator>
  ETL_CONSTEXPR14 bool operator ==(const reverse_iterator<TIterator>& lhs, const reverse_iterator<TIterator>& rhs)
  {
    return lhs.base() == rhs.base();
  }
 
  template <typename TIterator>
  ETL_CONSTEXPR14 bool operator !=(const reverse_iterator<TIterator>& lhs, const reverse_iterator<TIterator>& rhs)
  {
    return !(lhs == rhs);
  }
 
  template <typename TIterator>
  ETL_CONSTEXPR14 bool operator <(const reverse_iterator<TIterator>& lhs, const reverse_iterator<TIterator>& rhs)
  {
    return rhs.base() < lhs.base();
  }
 
  template <typename TIterator>
  ETL_CONSTEXPR14 bool operator >(const reverse_iterator<TIterator>& lhs, const reverse_iterator<TIterator>& rhs)
  {
    return rhs < lhs;
  }
 
  template <typename TIterator>
  ETL_CONSTEXPR14 bool operator <=(const reverse_iterator<TIterator>& lhs, const reverse_iterator<TIterator>& rhs)
  {
    return !(rhs < lhs);
  }
 
  template <typename TIterator>
  ETL_CONSTEXPR14 bool operator >=(const reverse_iterator<TIterator>& lhs, const reverse_iterator<TIterator>& rhs)
  {
    return !(lhs < rhs);
  }
 
  template <typename TIterator>
  ETL_CONSTEXPR14 typename reverse_iterator<TIterator>::difference_type operator -(const reverse_iterator<TIterator>& lhs, const reverse_iterator<TIterator>& rhs)
  {
    return rhs.base() - lhs.base();
  }
 
  template <typename TIterator, class TDifference>
  ETL_CONSTEXPR14 reverse_iterator<TIterator> operator +(TDifference n, const reverse_iterator<TIterator>& itr)
  {
    return itr.operator +(n);
  }
 
  //***************************************************************************
  //***************************************************************************
  template <typename TCategory, typename T, typename TDistance = ptrdiff_t, typename TPointer = T* , typename TReference = T& >
  struct iterator
  {
    typedef T          value_type;
    typedef TDistance  difference_type;
    typedef TPointer   pointer;
    typedef TReference reference;
    typedef TCategory  iterator_category;
  };
 
#if ETL_USING_CPP11
  //***************************************************************************
  // move_iterator
  template <typename TIterator>
  class move_iterator
  {
  public:
 
    typedef typename iterator_traits<TIterator>::iterator_category iterator_category;
    typedef typename iterator_traits<TIterator>::value_type        value_type;
    typedef typename iterator_traits<TIterator>::difference_type   difference_type;
    typedef TIterator    iterator_type;
    typedef TIterator    pointer;
    typedef value_type&& reference;
 
    move_iterator()
    {
    }
 
    explicit move_iterator(TIterator itr)
      : current(itr)
    {
    }
 
    template <typename U>
    move_iterator(const move_iterator<U>& itr)
      : current(itr.base())
    {
    }
 
    template <typename U>
    move_iterator& operator =(const move_iterator<U>& itr)
    {
      current = itr.current;
      return *this;
    }
 
    iterator_type base() const
    {
      return current;
    }
 
    pointer operator ->() const
    {
      return current;
    }
 
    reference operator *() const
    {
      return etl::move(*current);
    }
 
    move_iterator& operator++()
    {
      ++current;
      return *this;
    }
 
    move_iterator& operator--()
    {
      --current;
      return *this;
    }
 
    move_iterator operator++(int)
    {
      move_iterator temp = *this;
      ++current;
      return temp;
    }
 
    move_iterator operator--(int)
    {
      move_iterator temp = *this;
      --current;
      return temp;
    }
 
    move_iterator operator +(difference_type n) const
    {
      return move_iterator(current + n);
    }
 
    move_iterator operator -(difference_type n) const
    {
      return move_iterator(current - n);
    }
 
    move_iterator operator +=(difference_type n)
    {
      current += n;
      return *this;
    }
 
    move_iterator operator -=(difference_type n)
    {
      current -= n;
      return *this;
    }
 
    reference operator [](difference_type n) const
    {
      return etl::move(current[n]);
    }
 
  private:
 
    TIterator current;
  };
 
  template <typename TIterator>
  bool operator ==(const etl::move_iterator<TIterator>& lhs,
                   const etl::move_iterator<TIterator>& rhs)
  {
    return lhs.base() == rhs.base();
  }
 
  template <typename TIterator>
  bool operator !=(const etl::move_iterator<TIterator>& lhs,
                   const etl::move_iterator<TIterator>& rhs)
  {
    return !(lhs == rhs);
  }
 
  template <typename TIterator>
  bool operator <(const etl::move_iterator<TIterator>& lhs,
                  const etl::move_iterator<TIterator>& rhs)
  {
    return lhs.base() < rhs.base();
  }
 
  template <typename TIterator>
  bool operator <=(const etl::move_iterator<TIterator>& lhs,
                   const etl::move_iterator<TIterator>& rhs)
  {
    return !(rhs < lhs);
  }
 
  template <typename TIterator>
  bool operator >(const etl::move_iterator<TIterator>& lhs,
                  const etl::move_iterator<TIterator>& rhs)
  {
    return (rhs < lhs);
  }
 
  template <typename TIterator>
  bool operator >=(const etl::move_iterator<TIterator>& lhs,
                   const etl::move_iterator<TIterator>& rhs)
  {
    return !(lhs < rhs);
  }
 
  template <typename TIterator>
  move_iterator<TIterator> operator +(typename move_iterator<TIterator>::difference_type n,
                                      const move_iterator<TIterator>& rhs)
  {
    return rhs + n;
  }
 
  template <typename  TIterator1, typename TIterator2 >
  auto operator -(const move_iterator<TIterator1>& lhs,
                  const move_iterator<TIterator2>& rhs) -> decltype(lhs.base() - rhs.base())
  {
    return lhs.base() - rhs.base();
  }
 
  template <typename TIterator>
  etl::move_iterator<TIterator> make_move_iterator(TIterator itr)
  {
    return etl::move_iterator<TIterator>(itr);
  }
 
#endif //ETL_USING_CPP11
 
  //***************************************************************************
  // back_insert_iterator
  //***************************************************************************
 
  //***************************************************************************
  //***************************************************************************
  template <typename TContainer>
  class back_insert_iterator : public etl::iterator<ETL_OR_STD::output_iterator_tag, void, void, void, void>
  {
  public:
 
    typedef TContainer container_type;
 
    //***************************************************************************
    //***************************************************************************
    explicit ETL_CONSTEXPR14 back_insert_iterator(TContainer& c)
      : container(etl::addressof(c))
    {
    }
 
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 back_insert_iterator& operator =(const typename TContainer::value_type& value)
    {
      container->push_back(value);
      
      return (*this);
    }
 
#if ETL_USING_CPP11
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 back_insert_iterator& operator =(typename TContainer::value_type&& value)
    {
      container->push_back(etl::move(value));
      
      return (*this);
    }
#endif  // ETL_USING_CPP11
 
    //***************************************************************************
    //***************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14 back_insert_iterator& operator *()
    {
      return (*this);
    }
 
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 back_insert_iterator& operator ++()
    {
      return (*this);
    }
 
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 back_insert_iterator operator ++(int)
    {
      return (*this);
    }
 
  protected:
 
    TContainer* container;
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename TContainer>
  ETL_NODISCARD 
  ETL_CONSTEXPR14 
  etl::back_insert_iterator<TContainer> back_inserter(TContainer& container)
  {
    return etl::back_insert_iterator<TContainer>(container);
  }
 
  //***************************************************************************
  // front_insert_iterator
  //***************************************************************************
 
  //***************************************************************************
  //***************************************************************************
  template <typename TContainer>
  class front_insert_iterator : public etl::iterator<ETL_OR_STD::output_iterator_tag, void, void, void, void>
  {
  public:
 
    typedef TContainer container_type;
 
    //***************************************************************************
    //***************************************************************************
    explicit ETL_CONSTEXPR14 front_insert_iterator(TContainer& c)
      : container(etl::addressof(c))
    {
    }
 
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 front_insert_iterator& operator =(const typename TContainer::value_type& value)
    {
      container->push_front(value);
      return (*this);
    }
 
#if ETL_USING_CPP11
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 front_insert_iterator& operator =(typename TContainer::value_type&& value)
    {
      container->push_front(etl::move(value));
      return (*this);
    }
#endif  // ETL_USING_CPP11
 
    //***************************************************************************
    //***************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14 front_insert_iterator& operator *()
    {
      return (*this);
    }
 
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 front_insert_iterator& operator ++()
    {
      return (*this);
    }
 
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 front_insert_iterator operator ++(int)
    {
      return (*this);
    }
 
  protected:
 
    TContainer* container;
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename TContainer>
  ETL_NODISCARD
  ETL_CONSTEXPR14
  etl::front_insert_iterator<TContainer> front_inserter(TContainer& container)
  {
    return etl::front_insert_iterator<TContainer>(container);
  }
 
  //***************************************************************************
  // push_insert_iterator
  //***************************************************************************
 
  //***************************************************************************
  //***************************************************************************
  template <typename TContainer>
  class push_insert_iterator : public etl::iterator<ETL_OR_STD::output_iterator_tag, void, void, void, void>
  {
  public:
 
    typedef TContainer container_type;
 
    //***************************************************************************
    //***************************************************************************
    explicit ETL_CONSTEXPR14 push_insert_iterator(TContainer& c)
      : container(etl::addressof(c))
    {
    }
 
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 push_insert_iterator& operator =(const typename TContainer::value_type& value)
    {
      container->push(value);
 
      return (*this);
    }
 
#if ETL_USING_CPP11
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 push_insert_iterator& operator =(typename TContainer::value_type&& value)
    {
      container->push(etl::move(value));
 
      return (*this);
    }
#endif  // ETL_USING_CPP11
 
    //***************************************************************************
    //***************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14 push_insert_iterator& operator *()
    {
      return (*this);
    }
 
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 push_insert_iterator& operator ++()
    {
      return (*this);
    }
 
    //***************************************************************************
    //***************************************************************************
    ETL_CONSTEXPR14 push_insert_iterator operator ++(int)
    {
      return (*this);
    }
 
  protected:
 
    TContainer* container;
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename TContainer>
  ETL_NODISCARD
    ETL_CONSTEXPR14
    etl::push_insert_iterator<TContainer> push_inserter(TContainer& container)
  {
    return etl::push_insert_iterator<TContainer>(container);
  }
 
  //***************************************************************************
  // Helper templates.
  //***************************************************************************
  template <typename T>
  struct is_input_iterator
  {
    static ETL_CONSTANT bool value = etl::is_same<typename etl::iterator_traits<T>::iterator_category, ETL_OR_STD::input_iterator_tag>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_input_iterator<T>::value;
 
  template <typename T>
  struct is_output_iterator
  {
    static ETL_CONSTANT bool value = etl::is_same<typename etl::iterator_traits<T>::iterator_category, ETL_OR_STD::output_iterator_tag>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_output_iterator<T>::value;
 
  template <typename T>
  struct is_forward_iterator
  {
    static ETL_CONSTANT bool value = etl::is_same<typename etl::iterator_traits<T>::iterator_category, ETL_OR_STD::forward_iterator_tag>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_forward_iterator<T>::value;
 
  template <typename T>
  struct is_bidirectional_iterator
  {
    static ETL_CONSTANT bool value = etl::is_same<typename etl::iterator_traits<T>::iterator_category, ETL_OR_STD::bidirectional_iterator_tag>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_bidirectional_iterator<T>::value;
 
  // Deprecated
  template <typename T>
  struct is_random_iterator
  {
    static ETL_CONSTANT bool value = etl::is_same<typename etl::iterator_traits<T>::iterator_category, ETL_OR_STD::random_access_iterator_tag>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_random_iterator<T>::value;
 
  template <typename T>
  struct is_random_access_iterator
  {
    static ETL_CONSTANT bool value = etl::is_same<typename etl::iterator_traits<T>::iterator_category, ETL_OR_STD::random_access_iterator_tag>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_random_access_iterator<T>::value;
 
  template <typename T>
  struct is_input_iterator_concept
  {
    static ETL_CONSTANT bool value = etl::is_input_iterator<T>::value ||
                                               etl::is_forward_iterator<T>::value ||
                                               etl::is_bidirectional_iterator<T>::value ||
                                               etl::is_random_iterator<T>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_input_iterator_concept<T>::value;
 
  template <typename T>
  struct is_output_iterator_concept
  {
    static ETL_CONSTANT bool value = etl::is_output_iterator<T>::value ||
                                               etl::is_forward_iterator<T>::value ||
                                               etl::is_bidirectional_iterator<T>::value ||
                                               etl::is_random_iterator<T>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_output_iterator_concept<T>::value;
 
  template <typename T>
  struct is_forward_iterator_concept
  {
    static ETL_CONSTANT bool value = etl::is_forward_iterator<T>::value ||
                                               etl::is_bidirectional_iterator<T>::value ||
                                               etl::is_random_iterator<T>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_forward_iterator_concept<T>::value;
 
  template <typename T>
  struct is_bidirectional_iterator_concept
  {
    static ETL_CONSTANT bool value = etl::is_bidirectional_iterator<T>::value ||
                                               etl::is_random_iterator<T>::value;
  };
 
  template <typename T>
  ETL_CONSTANT bool is_bidirectional_iterator_concept<T>::value;
 
  // Deprecated
  template <typename T>
  struct is_random_iterator_concept
  {
    static ETL_CONSTANT bool value = etl::is_random_iterator<T>::value;
  };
 
  // Deprecated
  template <typename T>
  ETL_CONSTANT bool is_random_iterator_concept<T>::value;
 
  // Deprecated
  template <typename T>
  struct is_random_access_iterator_concept
  {
    static ETL_CONSTANT bool value = etl::is_random_access_iterator<T>::value;
  };
 
  // Deprecated
  template <typename T>
  ETL_CONSTANT bool is_random_access_iterator_concept<T>::value;
 
#if ETL_NOT_USING_STL || ETL_CPP11_NOT_SUPPORTED
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::iterator begin(TContainer& container)
  {
    return container.begin();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::const_iterator begin(const TContainer& container)
  {
    return container.begin();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::const_iterator cbegin(const TContainer& container)
  {
    return container.cbegin();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::iterator end(TContainer& container)
  {
    return container.end();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::const_iterator end(const TContainer& container)
  {
    return container.end();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::const_iterator cend(const TContainer& container)
  {
    return container.cend();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR TValue* begin(TValue(&data)[Array_Size])
  {
    return &data[0];
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR const TValue* begin(const TValue(&data)[Array_Size])
  {
    return &data[0];
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR const TValue* cbegin(const TValue(&data)[Array_Size])
  {
    return &data[0];
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR TValue* end(TValue(&data)[Array_Size])
  {
    return &data[Array_Size];
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR const TValue* end(const TValue(&data)[Array_Size])
  {
    return &data[Array_Size];
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR const TValue* cend(const TValue(&data)[Array_Size])
  {
    return &data[Array_Size];
  }
#endif
 
#if ETL_NOT_USING_STL || ETL_CPP14_NOT_SUPPORTED
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::reverse_iterator rbegin(TContainer& container)
  {
    return container.rbegin();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::const_reverse_iterator rbegin(const TContainer& container)
  {
    return container.rbegin();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::const_reverse_iterator crbegin(const TContainer& container)
  {
    return container.crbegin();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::reverse_iterator rend(TContainer& container)
  {
    return container.rend();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::const_reverse_iterator rend(const TContainer& container)
  {
    return container.rend();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::const_reverse_iterator crend(const TContainer& container)
  {
    return container.crend();
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_OR_STD::reverse_iterator<TValue*> rbegin(TValue(&data)[Array_Size])
  {
    return ETL_OR_STD::reverse_iterator<TValue*>(&data[Array_Size]);
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR ETL_OR_STD::reverse_iterator<const TValue*> crbegin(const TValue(&data)[Array_Size])
  {
    return ETL_OR_STD::reverse_iterator<const TValue*>(&data[Array_Size]);
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR ETL_OR_STD::reverse_iterator<TValue*> rend(TValue(&data)[Array_Size])
  {
    return ETL_OR_STD::reverse_iterator<TValue*>(&data[0]);
  }
 
  //*****************************************************************************
  //*****************************************************************************
  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR ETL_OR_STD::reverse_iterator<const TValue*> crend(const TValue(&data)[Array_Size])
  {
    return ETL_OR_STD::reverse_iterator<const TValue*>(&data[0]);
  }
#endif
 
#if ETL_NOT_USING_STL || ETL_CPP17_NOT_SUPPORTED
  //**************************************************************************
  //**************************************************************************
  template<typename TContainer>
  ETL_CONSTEXPR typename TContainer::size_type size(const TContainer& container)
  {
    return container.size();
  }

  template<typename TValue, size_t Array_Size>
  ETL_CONSTEXPR size_t size(TValue(&)[Array_Size])
  {
    return Array_Size;
  }
#endif
 
  //**************************************************************************
  //**************************************************************************
  template <typename T, size_t Array_Size>
  char(&array_size(T(&array)[Array_Size]))[Array_Size];
 
#define ETL_ARRAY_SIZE(a) sizeof(etl::array_size(a))
}
 
#endif