esp32_BNO08x/etl/forward_list.h

///\file

/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2014 John Wellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/

#ifndef ETL_FORWARD_LIST_INCLUDED
#define ETL_FORWARD_LIST_INCLUDED

#include "platform.h"
#include "algorithm.h"
#include "iterator.h"
#include "functional.h"
#include "utility.h"
#include "pool.h"
#include "exception.h"
#include "error_handler.h"
#include "debug_count.h"
#include "nullptr.h"
#include "type_traits.h"
#include "memory.h"
#include "iterator.h"
#include "static_assert.h"
#include "placement_new.h"
#include "initializer_list.h"

#include <stddef.h>

#include "private/minmax_push.h"

//*****************************************************************************
///\defgroup forward_list forward_list
/// A linked forward_list with the capacity defined at compile time.
///\ingroup containers
//*****************************************************************************

namespace etl
{
  //***************************************************************************
  /// Exception for the forward_list.
  ///\ingroup forward_list
  //***************************************************************************
  class forward_list_exception : public etl::exception
  {
  public:

    forward_list_exception(string_type reason_, string_type file_name_, numeric_type line_number_)
      : exception(reason_, file_name_, line_number_)
    {
    }
  };

  //***************************************************************************
  /// Full exception for the forward_list.
  ///\ingroup forward_list
  //***************************************************************************
  class forward_list_full : public etl::forward_list_exception
  {
  public:

    forward_list_full(string_type file_name_, numeric_type line_number_)
      : etl::forward_list_exception(ETL_ERROR_TEXT("forward_list:full", ETL_FORWARD_LIST_FILE_ID"A"), file_name_, line_number_)
    {
    }
  };

  //***************************************************************************
  /// Empty exception for the forward_list.
  ///\ingroup forward_list
  //***************************************************************************
  class forward_list_empty : public etl::forward_list_exception
  {
  public:

    forward_list_empty(string_type file_name_, numeric_type line_number_)
      : etl::forward_list_exception(ETL_ERROR_TEXT("forward_list:empty", ETL_FORWARD_LIST_FILE_ID"B"), file_name_, line_number_)
    {
    }
  };

  //***************************************************************************
  /// Iterator exception for the forward_list.
  ///\ingroup forward_list
  //***************************************************************************
  class forward_list_iterator : public etl::forward_list_exception
  {
  public:

    forward_list_iterator(string_type file_name_, numeric_type line_number_)
      : etl::forward_list_exception(ETL_ERROR_TEXT("forward_list:iterator", ETL_FORWARD_LIST_FILE_ID"C"), file_name_, line_number_)
    {
    }
  };

  //***************************************************************************
  /// Unsorted exception for the list.
  ///\ingroup list
  //***************************************************************************
  class forward_list_no_pool : public forward_list_exception
  {
  public:

    forward_list_no_pool(string_type file_name_, numeric_type line_number_)
      : forward_list_exception(ETL_ERROR_TEXT("list:no pool", ETL_FORWARD_LIST_FILE_ID"D"), file_name_, line_number_)
    {
    }
  };

  //***************************************************************************
  /// The base class for all forward_lists.
  ///\ingroup forward_list
  //***************************************************************************
  class forward_list_base
  {
  protected:

    //*************************************************************************
    /// The node element in the forward_list.
    //*************************************************************************
    struct node_t
    {
      node_t()
        : next(ETL_NULLPTR)
      {
      }

      node_t* next;
    };

  public:

    typedef size_t size_type; ///< The type used for determining the size of forward_list.

    //*************************************************************************
    /// <b>true</b> if the list has a shared pool.
    //*************************************************************************
    bool has_shared_pool() const
    {
      return pool_is_shared;
    }

    //*************************************************************************
    /// Gets the maximum possible size of the forward_list.
    //*************************************************************************
    size_type max_size() const
    {
      return MAX_SIZE;
    }

    //*************************************************************************
    /// Gets the maximum possible size of the forward_list.
    //*************************************************************************
    size_type capacity() const
    {
      return MAX_SIZE;
    }

    //*************************************************************************
    /// Gets the size of the forward_list.
    //*************************************************************************
    size_type size() const
    {
      if (has_shared_pool())
      {
        // We have to count what we actually own.
        size_type count = 0;

        node_t* p_node = start_node.next;

        while (p_node != ETL_NULLPTR)
        {
          ++count;
          p_node = p_node->next;
        }

        return count;
      }
      else
      {
        return p_node_pool->size();
      }
    }

    //*************************************************************************
    /// Checks to see if the forward_list is empty.
    //*************************************************************************
    bool empty() const
    {
      return (start_node.next == ETL_NULLPTR);
    }

    //*************************************************************************
    /// Checks to see if the forward_list is full.
    //*************************************************************************
    bool full() const
    {
      ETL_ASSERT(p_node_pool != ETL_NULLPTR, ETL_ERROR(forward_list_no_pool));
      return p_node_pool->full();
    }

    //*************************************************************************
    /// Returns the remaining capacity.
    ///\return The remaining capacity.
    //*************************************************************************
    size_t available() const
    {
      ETL_ASSERT(p_node_pool != ETL_NULLPTR, ETL_ERROR(forward_list_no_pool));
      return p_node_pool->available();
    }

    //*************************************************************************
    /// Reverses the forward_list.
    //*************************************************************************
    void reverse()
    {
      if (is_trivial_list())
      {
        return;
      }

      node_t* p_last = &start_node;
      node_t* p_current = p_last->next;
      node_t* p_next = p_current->next;

      p_current->next = ETL_NULLPTR;

      while (p_next != ETL_NULLPTR)
      {
        p_last = p_current;
        p_current = p_next;
        p_next = p_current->next;

        p_current->next = p_last;
      }

      join(&start_node, p_current);
    }

  protected:

    //*************************************************************************
    /// The constructor that is called from derived classes.
    //*************************************************************************
    forward_list_base(bool pool_is_shared_)
      : p_node_pool(ETL_NULLPTR),
        MAX_SIZE(0),
        pool_is_shared(pool_is_shared_)
    {
    }

    //*************************************************************************
    /// The constructor that is called from derived classes.
    //*************************************************************************
    forward_list_base(etl::ipool& node_pool_, size_type max_size_, bool pool_is_shared_)
      : p_node_pool(&node_pool_),
        MAX_SIZE(max_size_),
        pool_is_shared(pool_is_shared_)
    {
    }

    //*************************************************************************
    /// Destructor.
    //*************************************************************************
    ~forward_list_base()
    {
    }

    //*************************************************************************
    /// Get the head node.
    //*************************************************************************
    node_t* get_head()
    {
      return start_node.next;
    }

    //*************************************************************************
    /// Get the head node.
    //*************************************************************************
    const node_t* get_head() const
    {
      return start_node.next;
    }

    //*************************************************************************
    /// Insert a node.
    //*************************************************************************
    inline void insert_node_after(node_t& position, node_t& node)
    {
      // Connect to the forward_list.
      join(&node, position.next);
      join(&position, &node);
    }

    //*************************************************************************
    /// Is the forward_list a trivial length?
    //*************************************************************************
    bool is_trivial_list() const
    {
      return (size() < 2);
    }

    //*************************************************************************
    /// Join two nodes.
    //*************************************************************************
    void join(node_t* left, node_t* right)
    {
      left->next = right;
    }

    //*************************************************************************
    /// Set the node pool instance.
    //*************************************************************************
    void set_node_pool(etl::ipool& node_pool_)
    {
      p_node_pool = &node_pool_;
      MAX_SIZE    = p_node_pool->max_size();
    }

    //*************************************************************************
    /// Get the node pool instance.
    //*************************************************************************
    etl::ipool* get_node_pool()
    {
      return p_node_pool;
    }

    node_t      start_node;     ///< The node that acts as the forward_list start.
    etl::ipool* p_node_pool;    ///< The pool of data nodes used in the list.
    size_type   MAX_SIZE;       ///< The maximum size of the forward_list.
    bool        pool_is_shared; ///< If <b>true</b> then the pool is shared between lists.
    ETL_DECLARE_DEBUG_COUNT;     ///< Internal debugging.
  };

  //***************************************************************************
  /// A templated base for all etl::forward_list types.
  ///\ingroup forward_list
  //***************************************************************************
  template <typename T>
  class iforward_list : public etl::forward_list_base
  {
  public:

    typedef T        value_type;
    typedef T*       pointer;
    typedef const T* const_pointer;
    typedef T&       reference;
    typedef const T& const_reference;
    typedef size_t   size_type;

#if ETL_USING_CPP11
    typedef T&&      rvalue_reference;
#endif

  protected:

    //*************************************************************************
    /// The data node element in the forward_list.
    //*************************************************************************
    struct data_node_t : public node_t
    {
      explicit data_node_t(const T& value_)
        : value(value_)
      {}

      T value;
    };

  public:

    //*************************************************************************
    /// iterator.
    //*************************************************************************
    class iterator : public etl::iterator<ETL_OR_STD::forward_iterator_tag, T>
    {
    public:

      friend class iforward_list;
      friend class const_iterator;

      iterator()
        : p_node(ETL_NULLPTR)
      {
      }

      iterator(node_t* node)
        : p_node(node)
      {
      }

      iterator(const iterator& other)
        : p_node(other.p_node)
      {
      }

      iterator& operator ++()
      {
        p_node = p_node->next;
        return *this;
      }

      iterator operator ++(int)
      {
        iterator temp(*this);
        p_node = p_node->next;
        return temp;
      }

      iterator operator =(const iterator& other)
      {
        p_node = other.p_node;
        return *this;
      }

      reference operator *() const
      {
        return iforward_list::data_cast(p_node)->value;
      }

      pointer operator &() const
      {
        return &(iforward_list::data_cast(p_node)->value);
      }

      pointer operator ->() const
      {
        return &(iforward_list::data_cast(p_node)->value);
      }

      friend bool operator == (const iterator& lhs, const iterator& rhs)
      {
        return lhs.p_node == rhs.p_node;
      }

      friend bool operator != (const iterator& lhs, const iterator& rhs)
      {
        return !(lhs == rhs);
      }

    private:

      node_t* p_node;
    };

    //*************************************************************************
    /// const_iterator
    //*************************************************************************
    class const_iterator : public etl::iterator<ETL_OR_STD::forward_iterator_tag, const T>
    {
    public:

      friend class iforward_list;

      const_iterator()
        : p_node(ETL_NULLPTR)
      {
      }

      const_iterator(node_t* node)
        : p_node(node)
      {
      }

      const_iterator(const node_t* node)
        : p_node(node)
      {
      }

      const_iterator(const typename iforward_list::iterator& other)
        : p_node(other.p_node)
      {
      }

      const_iterator(const const_iterator& other)
        : p_node(other.p_node)
      {
      }

      const_iterator& operator ++()
      {
        p_node = p_node->next;
        return *this;
      }

      const_iterator operator ++(int)
      {
        const_iterator temp(*this);
        p_node = p_node->next;
        return temp;
      }

      const_iterator& operator =(const const_iterator& other)
      {
        p_node = other.p_node;
        return *this;
      }

      const_reference operator *() const
      {
        return iforward_list::data_cast(p_node)->value;
      }

      const_pointer operator &() const
      {
        return &(iforward_list::data_cast(p_node)->value);
      }

      const_pointer operator ->() const
      {
        return &(iforward_list::data_cast(p_node)->value);
      }

      friend bool operator == (const const_iterator& lhs, const const_iterator& rhs)
      {
        return lhs.p_node == rhs.p_node;
      }

      friend bool operator != (const const_iterator& lhs, const const_iterator& rhs)
      {
        return !(lhs == rhs);
      }

    private:

      const node_t* p_node;
    };

    typedef typename etl::iterator_traits<iterator>::difference_type difference_type;

    //*************************************************************************
    /// Gets the beginning of the forward_list.
    //*************************************************************************
    iterator begin()
    {
      return iterator(get_head());
    }

    //*************************************************************************
    /// Gets the beginning of the forward_list.
    //*************************************************************************
    const_iterator begin() const
    {
      return const_iterator(get_head());
    }

    //*************************************************************************
    /// Gets before the beginning of the forward_list.
    //*************************************************************************
    iterator before_begin()
    {
      return iterator(&start_node);
    }

    //*************************************************************************
    /// Gets before the beginning of the forward_list.
    //*************************************************************************
    const_iterator before_begin() const
    {
      return const_iterator(&start_node);
    }

    //*************************************************************************
    /// Gets the beginning of the forward_list.
    //*************************************************************************
    const_iterator cbegin() const
    {
      return const_iterator(get_head());
    }

    //*************************************************************************
    /// Gets the end of the forward_list.
    //*************************************************************************
    iterator end()
    {
      return iterator();
    }

    //*************************************************************************
    /// Gets the end of the forward_list.
    //*************************************************************************
    const_iterator end() const
    {
      return const_iterator();
    }

    //*************************************************************************
    /// Gets the end of the forward_list.
    //*************************************************************************
    const_iterator cend() const
    {
      return const_iterator();
    }

    //*************************************************************************
    /// Clears the forward_list.
    //*************************************************************************
    void clear()
    {
      initialise();
    }

    //*************************************************************************
    /// Gets a reference to the first element.
    //*************************************************************************
    reference front()
    {
      return data_cast(*get_head()).value;
    }

    //*************************************************************************
    /// Gets a const reference to the first element.
    //*************************************************************************
    const_reference front() const
    {
      return data_cast(*get_head()).value;
    }

    //*************************************************************************
    /// Assigns a range of values to the forward_list.
    /// If asserts or exceptions are enabled throws etl::forward_list_full if the forward_list does not have enough free space.
    /// If ETL_THROW_EXCEPTIONS & ETL_DEBUG are defined throws forward_list_iterator if the iterators are reversed.
    //*************************************************************************
    template <typename TIterator>
    void assign(TIterator first, TIterator last, typename etl::enable_if<!etl::is_integral<TIterator>::value, int>::type = 0)
    {
#if ETL_IS_DEBUG_BUILD
      difference_type d = etl::distance(first, last);
      ETL_ASSERT(d >= 0, ETL_ERROR(forward_list_iterator));
#endif

      initialise();

      node_t* p_last_node = &start_node;

      // Add all of the elements.
      while (first != last)
      {
        ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

        data_node_t& data_node = allocate_data_node(*first);
        ++first;
        join(p_last_node, &data_node);
        data_node.next = ETL_NULLPTR;
        p_last_node = &data_node;
      }
    }

    //*************************************************************************
    /// Assigns 'n' copies of a value to the forward_list.
    //*************************************************************************
    void assign(size_t n, const T& value)
    {
      ETL_ASSERT(n <= MAX_SIZE, ETL_ERROR(forward_list_full));

      initialise();

      node_t* p_last_node = &start_node;

      // Add all of the elements.
      while (size() < n)
      {
        data_node_t& data_node = allocate_data_node(value);
        join(p_last_node, &data_node);
        data_node.next = ETL_NULLPTR;
        p_last_node = &data_node;
      }
    }

    //*************************************************************************
    /// Pushes a value to the front of the forward_list.
    //*************************************************************************
    void push_front(const T& value)
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));
#endif

      data_node_t& data_node = allocate_data_node(value);
      insert_node_after(start_node, data_node);
    }

#if ETL_USING_CPP11
    //*************************************************************************
    /// Pushes a value to the front of the forward_list.
    //*************************************************************************
    void push_front(rvalue_reference value)
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));
#endif

      data_node_t& data_node = allocate_data_node(etl::move(value));
      insert_node_after(start_node, data_node);
    }
#endif

#if ETL_USING_CPP11 && ETL_NOT_USING_STLPORT && !defined(ETL_FORWARD_LIST_FORCE_CPP03_IMPLEMENTATION)
    //*************************************************************************
    /// Emplaces a value to the front of the list..
    //*************************************************************************
    template <typename ... Args>
    reference emplace_front(Args && ... args)
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));
#endif
      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(etl::forward<Args>(args)...);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(start_node, *p_data_node);
      return front();
    }
#else
    //*************************************************************************
    /// Emplaces a value to the front of the list..
    //*************************************************************************
    reference emplace_front()
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));
#endif
      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T();
      ETL_INCREMENT_DEBUG_COUNT;
        insert_node_after(start_node, *p_data_node);
      return front();
    }

    //*************************************************************************
    /// Emplaces a value to the front of the list..
    //*************************************************************************
    template <typename T1>
    reference emplace_front(const T1& value1)
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));
#endif
      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(value1);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(start_node, *p_data_node);
      return front();
    }

    //*************************************************************************
    /// Emplaces a value to the front of the list..
    //*************************************************************************
    template <typename T1, typename T2>
    reference emplace_front(const T1& value1, const T2& value2)
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));
#endif
      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(value1, value2);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(start_node, *p_data_node);
      return front();
    }

    //*************************************************************************
    /// Emplaces a value to the front of the list..
    //*************************************************************************
    template <typename T1, typename T2, typename T3>
    reference emplace_front(const T1& value1, const T2& value2, const T3& value3)
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));
#endif
      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(value1, value2, value3);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(start_node, *p_data_node);
      return front();
    }

    //*************************************************************************
    /// Emplaces a value to the front of the list..
    //*************************************************************************
    template <typename T1, typename T2, typename T3, typename T4>
    reference emplace_front(const T1& value1, const T2& value2, const T3& value3, const T4& value4)
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));
#endif
      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(value1, value2, value3, value4);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(start_node, *p_data_node);
      return front();
    }
#endif // ETL_USING_CPP11 && ETL_NOT_USING_STLPORT

    //*************************************************************************
    /// Removes a value from the front of the forward_list.
    //*************************************************************************
    void pop_front()
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(!empty(), ETL_ERROR(forward_list_empty));
#endif
      remove_node_after(start_node);
    }

    //*************************************************************************
    /// Resizes the forward_list.
    //*************************************************************************
    void resize(size_t n)
    {
      resize(n, T());
    }

    //*************************************************************************
    /// Resizes the forward_list.
    /// If asserts or exceptions are enabled, will throw an etl::forward_list_full
    /// if <b>n</b> is larger than the maximum size.
    //*************************************************************************
    void resize(size_t n, T value)
    {
      ETL_ASSERT(n <= MAX_SIZE, ETL_ERROR(forward_list_full));

      if (n == 0U)
      {
        clear();
      }
      else if (empty())
      {
        assign(n, value);
      }
      else
      {
        size_t i = 0UL;
        iterator i_node = begin();
        iterator i_last_node;

        // Find where we're currently at.
        while ((i < n) && (i_node != end()))
        {
          ++i;
          i_last_node = i_node;
          ++i_node;
        }

        if (i_node != end())
        {
          // Reduce.
          erase_after(i_last_node, end());
        }
        else if (i_node == end())
        {
          // Increase.
          while (i < n)
          {
            i_last_node = insert_after(i_last_node, value);
            ++i;
          }
        }
      }
    }

    //*************************************************************************
    /// Inserts a value to the forward_list after the specified position.
    //*************************************************************************
    iterator insert_after(const_iterator position, const T& value)
    {
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

      data_node_t& data_node = allocate_data_node(value);
      insert_node_after(*to_iterator(position).p_node, data_node);

      return iterator(&data_node);
    }

#if ETL_USING_CPP11 && ETL_NOT_USING_STLPORT && !defined(ETL_FORWARD_LIST_FORCE_CPP03_IMPLEMENTATION)
    //*************************************************************************
    /// Emplaces a value to the forward_list after the specified position.
    //*************************************************************************
    template <typename ... Args>
    iterator emplace_after(const_iterator position, Args && ... args)
    {
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(etl::forward<Args>(args)...);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(*to_iterator(position).p_node, *p_data_node);

      return iterator(p_data_node);
    }
#else
    //*************************************************************************
    /// Emplaces a value to the forward_list after the specified position.
    //*************************************************************************
    iterator emplace_after(const_iterator position)
    {
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T();
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(*to_iterator(position).p_node, *p_data_node);

      return iterator(p_data_node);
    }

    //*************************************************************************
    /// Emplaces a value to the forward_list after the specified position.
    //*************************************************************************
    template <typename T1>
    iterator emplace_after(const_iterator position, const T1& value1)
    {
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(value1);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(*to_iterator(position).p_node, *p_data_node);

      return iterator(p_data_node);
    }

    //*************************************************************************
    /// Emplaces a value to the forward_list after the specified position.
    //*************************************************************************
    template <typename T1, typename T2>
    iterator emplace_after(const_iterator position, const T1& value1, const T2& value2)
    {
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(value1, value2);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(*to_iterator(position).p_node, *p_data_node);

      return iterator(p_data_node);
    }

    //*************************************************************************
    /// Emplaces a value to the forward_list after the specified position.
    //*************************************************************************
    template <typename T1, typename T2, typename T3>
    iterator emplace_after(const_iterator position, const T1& value1, const T2& value2, const T3& value3)
    {
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(value1, value2, value3);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(*to_iterator(position).p_node, *p_data_node);

      return iterator(p_data_node);
    }

    //*************************************************************************
    /// Emplaces a value to the forward_list after the specified position.
    //*************************************************************************
    template <typename T1, typename T2, typename T3, typename T4>
    iterator emplace_after(const_iterator position, const T1& value1, const T2& value2, const T3& value3, const T4& value4)
    {
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

      data_node_t* p_data_node = allocate_data_node();
      ::new (&(p_data_node->value)) T(value1, value2, value3, value4);
      ETL_INCREMENT_DEBUG_COUNT;
      insert_node_after(*to_iterator(position).p_node, *p_data_node);

      return iterator(p_data_node);
    }
#endif // ETL_USING_CPP11 && ETL_NOT_USING_STLPORT

    //*************************************************************************
    /// Inserts 'n' copies of a value to the forward_list after the specified position.
    //*************************************************************************
    iterator insert_after(const_iterator position, size_t n, const T& value)
    {
      ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

      for (size_t i = 0UL; !full() && (i < n); ++i)
      {
        // Set up the next free node.
        data_node_t& data_node = allocate_data_node(value);
        insert_node_after(*to_iterator(position).p_node, data_node);
      }

      if (n > 0U)
      {
        ++position;
      }

      return to_iterator(position);
    }

    //*************************************************************************
    /// Inserts a range of values to the forward_list after the specified position.
    //*************************************************************************
    template <typename TIterator>
    iterator insert_after(const_iterator position, TIterator first, TIterator last, typename etl::enable_if<!etl::is_integral<TIterator>::value, int>::type = 0)
    {
#if ETL_IS_DEBUG_BUILD
      difference_type d = etl::distance(first, last);
      ETL_ASSERT((d + size()) <= MAX_SIZE, ETL_ERROR(forward_list_full));
#endif

      while (first != last)
      {
        // Set up the next free node.
        data_node_t& data_node = allocate_data_node(*first);
        ++first;
        insert_node_after(*to_iterator(position).p_node, data_node);
        ++position;
      }

      return to_iterator(position);
    }

    //*************************************************************************
    /// Erases the value at the specified position.
    //*************************************************************************
    iterator erase_after(iterator position)
    {
      iterator next(position);
      if (next != end())
      {
        ++next;
        if (next != end())
        {
          ++next;
          remove_node_after(*position.p_node);
        }
      }

      return next;
    }

    //*************************************************************************
    /// Erases the value at the specified position.
    //*************************************************************************
    iterator erase_after(const_iterator position)
    {
      iterator next(position);
      if (next != end())
      {
        ++next;
        if (next != end())
        {
          ++next;
          remove_node_after(*position.p_node);
        }
      }

      return next;
    }

    //*************************************************************************
    /// Erases a range of elements.
    //*************************************************************************
    iterator erase_after(const_iterator first, const_iterator last)
    {
      if (first != end() && (first != last))
      {
        node_t* p_first = to_iterator(first).p_node;
        node_t* p_last  = to_iterator(last).p_node;
        node_t* p_next  = p_first->next;

        // Join the ends.
        join(p_first, p_last);

        p_first = p_next;

        // Erase the ones in between.
        while (p_first != p_last)
        {
          p_next = p_first->next;                                 // Remember the next node.
          destroy_data_node(static_cast<data_node_t&>(*p_first)); // Destroy the pool object.
          p_first = p_next;                                       // Move to the next node.
        }

        if (p_next == ETL_NULLPTR)
        {
          return end();
        }
        else
        {
          return iterator(p_last);
        }
      }
      else
      {
        return end();
      }
    }

    //*************************************************************************
    /// Moves a range from one position to another within the list.
    /// Moves a range at position 'first_before' to the position before 'to_before'.
    //*************************************************************************
    void move_after(const_iterator from_before, const_iterator to_before)
    {
      if (from_before == to_before) // Can't move to after yourself!
      {
        return;
      }

      node_t* p_from_before = const_cast<node_t*>(from_before.p_node); // We're not changing the value, just it's position.
      node_t* p_to_before   = const_cast<node_t*>(to_before.p_node);   // We're not changing the value, just it's position.

      node_t* p_from = p_from_before->next;

      // Disconnect from the list.
      join(p_from_before, p_from->next);

      // Attach it to the new position.
      join(p_from, p_to_before->next);
      join(p_to_before, p_from);
    }

    //*************************************************************************
    /// Moves a range from one position to another within the list.
    /// Moves a range at position 'first_before'/'last' to the position before 'to_before'.
    //*************************************************************************
    void move_after(const_iterator first_before, const_iterator last, const_iterator to_before)
    {
      if ((first_before == to_before) || (last == to_before))
      {
        return; // Can't more to before yourself!
      }

//#if ETL_IS_DEBUG_BUILD
      // Check that we are not doing an illegal move!
      for (const_iterator item = first_before; item != last; ++item)
      {
        ETL_ASSERT(item != to_before, ETL_ERROR(forward_list_iterator));
      }
//#endif

      node_t* p_first_before = const_cast<node_t*>(first_before.p_node); // We're not changing the value, just it's position.
      node_t* p_last = const_cast<node_t*>(last.p_node);         // We're not changing the value, just it's position.
      node_t* p_to_before = const_cast<node_t*>(to_before.p_node);    // We're not changing the value, just it's position.
      node_t* p_first = p_first_before->next;
      node_t* p_final = p_first_before;

      // Find the last node that will be moved.
      while (p_final->next != p_last)
      {
        p_final = p_final->next;
      }

      // Disconnect from the list.
      join(p_first_before, p_final->next);

      // Attach it to the new position.
      join(p_final, p_to_before->next);
      join(p_to_before, p_first);
    }

    //*************************************************************************
    /// Removes all but the first element from every consecutive group of equal
    /// elements in the container.
    //*************************************************************************
    void unique()
    {
      unique(etl::equal_to<T>());
    }

    //*************************************************************************
    /// Removes all but the one element from every consecutive group of equal
    /// elements in the container.
    //*************************************************************************
    template <typename TIsEqual>
    void unique(TIsEqual isEqual)
    {
      if (empty())
      {
        return;
      }

      node_t* last = get_head();
      node_t* current = last->next;

      while (current != ETL_NULLPTR)
      {
        // Is this value the same as the last?
        if (isEqual(data_cast(current)->value, data_cast(last)->value))
        {
          remove_node_after(*last);
        }
        else
        {
          // Move on one.
          last = current;
        }

        current = last->next;
      }
    }

    //*************************************************************************
    /// Sort using in-place merge sort algorithm.
    /// Uses 'less-than operator as the predicate.
    //*************************************************************************
    void sort()
    {
      sort(etl::less<T>());
    }

    //*************************************************************************
    /// Stable sort using in-place merge sort algorithm.
    /// Copyright 2001 Simon Tatham.
    ///
    /// Permission is hereby granted, free of charge, to any person
    /// obtaining a copy of this software and associated documentation
    /// files (the "Software"), to deal in the Software without
    /// restriction, including without limitation the rights to use,
    /// copy, modify, merge, publish, distribute, sublicense, and/or
    /// sell copies of the Software, and to permit persons to whom the
    /// Software is furnished to do so, subject to the following
    /// conditions:
    ///
    /// The above copyright notice and this permission notice shall be
    /// included in all copies or substantial portions of the Software.
    ///
    /// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    /// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
    /// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    /// NONINFRINGEMENT.  IN NO EVENT SHALL SIMON TATHAM BE LIABLE FOR
    /// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
    /// CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
    /// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    /// SOFTWARE.
    //*************************************************************************
    template <typename TCompare>
    void sort(TCompare compare)
    {
      iterator p_left;
      iterator p_right;
      iterator p_node;
      iterator p_head;
      iterator p_tail;
      int      list_size = 1;
      int      number_of_merges;
      int      left_size;
      int      right_size;

      if (is_trivial_list())
      {
        return;
      }

      while (true)
      {
        p_left = begin();
        p_head = before_begin();
        p_tail = before_begin();

        number_of_merges = 0;  // Count the number of merges we do in this pass.

        while (p_left != end())
        {
          ++number_of_merges;  // There exists a merge to be done.
          p_right = p_left;
          left_size = 0;

          // Step 'list_size' places along from left
          for (int i = 0; i < list_size; ++i)
          {
            ++left_size;

            ++p_right;

            if (p_right == end())
            {
              break;
            }
          }

          // If right hasn't fallen off end, we have two lists to merge.
          right_size = list_size;

          // Now we have two lists. Merge them.
          while (left_size > 0 || (right_size > 0 && p_right != end()))
          {
            // Decide whether the next node of merge comes from left or right.
            if (left_size == 0)
            {
              // Left is empty. The node must come from right.
              p_node = p_right;
              ++p_right;
              --right_size;
            }
            else if (right_size == 0 || p_right == end())
            {
              // Right is empty. The node must come from left.
              p_node = p_left;
              ++p_left;
              --left_size;
            }
            else if (!compare(*p_right, *p_left))
            {
              // First node of left is lower or same. The node must come from left.
              p_node = p_left;
              ++p_left;
              --left_size;
            }
            else
            {
              // First node of right is lower. The node must come from right.
              p_node = p_right;
              ++p_right;
              --right_size;
            }

            // Add the next node to the merged head.
            if (p_head == before_begin())
            {
              join(p_head.p_node, p_node.p_node);
              p_head = p_node;
              p_tail = p_node;
            }
            else
            {
              join(p_tail.p_node, p_node.p_node);
              p_tail = p_node;
            }

            p_tail.p_node->next = ETL_NULLPTR;
          }

          // Now left has stepped `list_size' places along, and right has too.
          p_left = p_right;
        }

        // If we have done only one merge, we're finished.
        if (number_of_merges <= 1)   // Allow for number_of_merges == 0, the empty head case
        {
          return;
        }

        // Otherwise repeat, merging lists twice the size
        list_size *= 2;
      }
    }

    //*************************************************************************
    // Removes the values specified.
    //*************************************************************************
    void remove(const T& value)
    {
      iterator i_item = begin();
      iterator i_last_item = before_begin();

      while (i_item != end())
      {
        if (*i_item == value)
        {
          i_item = erase_after(i_last_item);
        }
        else
        {
          ++i_item;
          ++i_last_item;
        }
      }
    }

    //*************************************************************************
    /// Removes according to a predicate.
    //*************************************************************************
    template <typename TPredicate>
    void remove_if(TPredicate predicate)
    {
      iterator i_item = begin();
      iterator i_last_item = before_begin();

      while (i_item != end())
      {
        if (predicate(*i_item))
        {
          i_item = erase_after(i_last_item);
        }
        else
        {
          ++i_item;
          ++i_last_item;
        }
      }
    }

    //*************************************************************************
    /// Assignment operator.
    //*************************************************************************
    iforward_list& operator = (const iforward_list& rhs)
    {
      if (&rhs != this)
      {
        assign(rhs.cbegin(), rhs.cend());
      }

      return *this;
    }

#if ETL_USING_CPP11
    //*************************************************************************
    /// Move assignment operator.
    //*************************************************************************
    iforward_list& operator = (iforward_list&& rhs)
    {
      move_container(etl::move(rhs));

      return *this;
    }
#endif

  protected:

    //*************************************************************************
    /// Constructor.
    //*************************************************************************
    iforward_list(bool pool_is_shared_)
      : forward_list_base(pool_is_shared_)
    {
    }

    //*************************************************************************
    /// Constructor.
    //*************************************************************************
    iforward_list(etl::ipool& node_pool, size_t max_size_, bool pool_is_shared_)
      : forward_list_base(node_pool, max_size_, pool_is_shared_)
    {
    }

    //*************************************************************************
    /// Initialise the forward_list.
    //*************************************************************************
    void initialise()
    {
      if (!empty())
      {
        if (etl::is_trivially_destructible<T>::value && !has_shared_pool())
        {
          ETL_ASSERT(p_node_pool != ETL_NULLPTR, ETL_ERROR(forward_list_no_pool));
          p_node_pool->release_all();
          ETL_RESET_DEBUG_COUNT;
        }
        else
        {
          node_t* p_first = start_node.next;
          node_t* p_next;

          // Erase the ones in between.
          while (p_first != ETL_NULLPTR)
          {
            p_next = p_first->next;                                 // Remember the next node.
            destroy_data_node(static_cast<data_node_t&>(*p_first)); // Destroy the pool object.
            p_first = p_next;                                       // Move to the next node.
          }
        }
      }

      start_node.next = ETL_NULLPTR;
    }

    //*************************************************************************
    /// Allocate a data_node_t.
    //*************************************************************************
    data_node_t& allocate_data_node(const_reference value)
    {
      data_node_t* p_node = allocate_data_node();
      ::new (&(p_node->value)) T(value);
      ETL_INCREMENT_DEBUG_COUNT;

      return *p_node;
    }

#if ETL_USING_CPP11
    //*************************************************************************
    /// Allocate a data_node_t.
    //*************************************************************************
    data_node_t& allocate_data_node(rvalue_reference value)
    {
      data_node_t* p_node = allocate_data_node();
      ::new (&(p_node->value)) T(etl::move(value));
      ETL_INCREMENT_DEBUG_COUNT;

      return *p_node;
    }
#endif

#if ETL_USING_CPP11
    //*************************************************************************
    /// Move a forward list
    //*************************************************************************
    void move_container(iforward_list&& rhs)
    {
      if (&rhs != this)
      {
        this->initialise();

        if (!rhs.empty())
        {
          // Are we using the same pool?
          if (this->get_node_pool() == rhs.get_node_pool())
          {
            // Just link the nodes to this list.
            this->start_node.next = rhs.start_node.next;

            ETL_SET_DEBUG_COUNT(ETL_OBJECT_GET_DEBUG_COUNT(rhs));

            ETL_OBJECT_RESET_DEBUG_COUNT(rhs);
            rhs.start_node.next = ETL_NULLPTR;
          }
          else
          {
            node_t* p_last_node = &this->start_node;

            // Add all of the elements.
            etl::iforward_list<T>::iterator first = rhs.begin();
            etl::iforward_list<T>::iterator last  = rhs.end();

            while (first != last)
            {
              ETL_ASSERT(!full(), ETL_ERROR(forward_list_full));

              data_node_t& data_node = this->allocate_data_node(etl::move(*first));
              ++first;
              join(p_last_node, &data_node);
              data_node.next = ETL_NULLPTR;
              p_last_node = &data_node;
            }

            rhs.initialise();
          }
        }
      }
    }
#endif

  private:

    //*************************************************************************
    /// Downcast a node_t* to a data_node_t*
    //*************************************************************************
    static data_node_t* data_cast(node_t* p_node)
    {
      return static_cast<data_node_t*>(p_node);
    }

    //*************************************************************************
    /// Downcast a node_t& to a data_node_t&
    //*************************************************************************
    static data_node_t& data_cast(node_t& node)
    {
      return static_cast<data_node_t&>(node);
    }

    //*************************************************************************
    /// Downcast a const node_t* to a const data_node_t*
    //*************************************************************************
    static const data_node_t* data_cast(const node_t* p_node)
    {
      return static_cast<const data_node_t*>(p_node);
    }

    //*************************************************************************
    /// Downcast a const node_t& to a const data_node_t&
    //*************************************************************************
    static const data_node_t& data_cast(const node_t& node)
    {
      return static_cast<const data_node_t&>(node);
    }

    //*************************************************************************
    /// Remove a node.
    //*************************************************************************
    void remove_node_after(node_t& node)
    {
      // The node to erase.
      node_t* p_node = node.next;

      if (p_node != ETL_NULLPTR)
      {
        // Disconnect the node from the forward_list.
        join(&node, p_node->next);

        // Destroy the pool object.
        destroy_data_node(static_cast<data_node_t&>(*p_node));
      }
    }

    //*************************************************************************
    /// Create a node.
    //*************************************************************************
    data_node_t* allocate_data_node()
    {
      data_node_t* (etl::ipool::*func)() = &etl::ipool::allocate<data_node_t>;
      return (p_node_pool->*func)();
    }

    //*************************************************************************
    /// Destroy a data_node_t.
    //*************************************************************************
    void destroy_data_node(data_node_t& node)
    {
      node.value.~T();
      p_node_pool->release(&node);
      ETL_DECREMENT_DEBUG_COUNT;
    }

    // Disable copy construction.
    iforward_list(const iforward_list&);

    //*************************************************************************
    /// Destructor.
    //*************************************************************************
#if defined(ETL_POLYMORPHIC_FORWARD_LIST) || defined(ETL_POLYMORPHIC_CONTAINERS)
  public:
    virtual ~iforward_list()
    {
    }
#else
  protected:
    ~iforward_list()
    {
    }
#endif

  private:

    //*************************************************************************
    /// Convert const_iterator to iterator.
    //*************************************************************************
    iterator to_iterator(const_iterator itr) const
    {
      return iterator(const_cast<node_t*>(itr.p_node));
    }
  };

  //*************************************************************************
  /// A templated forward_list implementation that uses a fixed size pool.
  ///\note 'merge' and 'splice_after' and are not supported.
  //*************************************************************************
  template <typename T, const size_t MAX_SIZE_>
  class forward_list : public etl::iforward_list<T>
  {
  public:

    ETL_STATIC_ASSERT((MAX_SIZE_ > 0U), "Zero capacity etl::forward_list is not valid");

    static ETL_CONSTANT size_t MAX_SIZE = MAX_SIZE_;

  public:

    typedef T        value_type;
    typedef T*       pointer;
    typedef const T* const_pointer;
    typedef T&       reference;
    typedef const T& const_reference;
    typedef size_t   size_type;

    //*************************************************************************
    /// Default constructor.
    //*************************************************************************
    forward_list()
      : etl::iforward_list<T>(node_pool, MAX_SIZE, false)
    {
      this->initialise();
    }

    //*************************************************************************
    /// Construct from size and value.
    //*************************************************************************
    explicit forward_list(size_t initial_size, const T& value = T())
      : etl::iforward_list<T>(node_pool, MAX_SIZE, false)
    {
      this->assign(initial_size, value);
    }

    //*************************************************************************
    /// Copy constructor.
    //*************************************************************************
    forward_list(const forward_list& other)
      : etl::iforward_list<T>(node_pool, MAX_SIZE, false)
    {
      this->assign(other.cbegin(), other.cend());
    }

#if ETL_USING_CPP11
    //*************************************************************************
    /// Move constructor.
    //*************************************************************************
    forward_list(forward_list&& other)
      : etl::iforward_list<T>(node_pool, MAX_SIZE, false)
    {
      this->move_container(etl::move(other));
    }
#endif

    //*************************************************************************
    /// Construct from range.
    //*************************************************************************
    template <typename TIterator>
    forward_list(TIterator first, TIterator last, typename etl::enable_if<!etl::is_integral<TIterator>::value, int>::type = 0)
      : etl::iforward_list<T>(node_pool, MAX_SIZE, false)
    {
      this->assign(first, last);
    }

#if ETL_HAS_INITIALIZER_LIST
    //*************************************************************************
    /// Construct from initializer_list.
    //*************************************************************************
    forward_list(std::initializer_list<T> init)
      : etl::iforward_list<T>(node_pool, MAX_SIZE, false)
    {
      this->assign(init.begin(), init.end());
    }
#endif

    //*************************************************************************
    /// Destructor.
    //*************************************************************************
    ~forward_list()
    {
      this->initialise();
    }

    //*************************************************************************
    /// Assignment operator.
    //*************************************************************************
    forward_list& operator = (const forward_list& rhs)
    {
      if (&rhs != this)
      {
        this->assign(rhs.cbegin(), rhs.cend());
      }

      return *this;
    }

#if ETL_USING_CPP11
    //*************************************************************************
    /// Move assignment operator.
    //*************************************************************************
    forward_list& operator = (forward_list&& rhs)
    {

      this->move_container(etl::move(rhs));

      return *this;
    }
#endif

  private:

    /// The pool of nodes used in the list.
    etl::pool<typename etl::iforward_list<T>::data_node_t, MAX_SIZE> node_pool;
  };

  template <typename T, const size_t MAX_SIZE_>
  ETL_CONSTANT size_t forward_list<T, MAX_SIZE_>::MAX_SIZE;

  //*************************************************************************
  /// Template deduction guides.
  //*************************************************************************
#if ETL_USING_CPP17 && ETL_HAS_INITIALIZER_LIST
  template <typename... T>
  forward_list(T...) ->forward_list<typename etl::common_type_t<T...>, sizeof...(T)>;
#endif

  //*************************************************************************
  /// Make
  //*************************************************************************
#if ETL_USING_CPP11 && ETL_HAS_INITIALIZER_LIST
  template <typename... T>
  constexpr auto make_forward_list(T&&... t) -> etl::forward_list<typename etl::common_type_t<T...>, sizeof...(T)>
  {
    return { etl::forward<T>(t)... };
  }
#endif

  //*************************************************************************
  /// A templated forward_list implementation that uses a fixed size pool.
  ///\note 'merge' and 'splice_after' and are not supported.
  //*************************************************************************
  template <typename T>
  class forward_list_ext : public etl::iforward_list<T>
  {
  public:

    typedef T        value_type;
    typedef T*       pointer;
    typedef const T* const_pointer;
    typedef T&       reference;
    typedef const T& const_reference;
    typedef size_t   size_type;

    typedef typename etl::iforward_list<T>::data_node_t pool_type;

    //*************************************************************************
    /// Default constructor.
    //*************************************************************************
    forward_list_ext()
      : etl::iforward_list<T>(true)
    {
    }

    //*************************************************************************
    /// Default constructor.
    //*************************************************************************
    explicit forward_list_ext(etl::ipool& node_pool)
      : etl::iforward_list<T>(node_pool, node_pool.max_size(), true)
    {
      this->initialise();
    }

    //*************************************************************************
    /// Construct from size.
    //*************************************************************************
    explicit forward_list_ext(size_t initial_size, etl::ipool& node_pool)
      : etl::iforward_list<T>(node_pool, node_pool.max_size(), true)
    {
      this->assign(initial_size, T());
    }

    //*************************************************************************
    /// Construct from size and value.
    //*************************************************************************
    explicit forward_list_ext(size_t initial_size, const T& value, etl::ipool& node_pool)
      : etl::iforward_list<T>(node_pool, node_pool.max_size(), true)
    {
      this->assign(initial_size, value);
    }

    //*************************************************************************
    /// Copy constructor. Implicit pool.
    //*************************************************************************
    forward_list_ext(const forward_list_ext& other)
      : etl::iforward_list<T>(*other.p_node_pool, other.p_node_pool->max_size(), true)
    {
      this->assign(other.cbegin(), other.cend());
    }

    //*************************************************************************
    /// Copy constructor. Explicit pool.
    //*************************************************************************
    forward_list_ext(const forward_list_ext& other, etl::ipool& node_pool)
      : etl::iforward_list<T>(node_pool, node_pool.max_size(), true)
    {
      this->assign(other.cbegin(), other.cend());
    }

#if ETL_USING_CPP11
    //*************************************************************************
    /// Move constructor. Implicit pool
    //*************************************************************************
    forward_list_ext(forward_list_ext&& other)
      : etl::iforward_list<T>(*other.p_node_pool, other.p_node_pool->max_size(), true)
    {
      this->move_container(etl::move(other));
    }

    //*************************************************************************
    /// Move constructor. Explicit pool
    //*************************************************************************
    forward_list_ext(forward_list_ext&& other, etl::ipool& node_pool)
      : etl::iforward_list<T>(node_pool, node_pool.max_size(), true)
    {
      this->move_container(etl::move(other));
    }
#endif

    //*************************************************************************
    /// Construct from range.
    //*************************************************************************
    template <typename TIterator>
    forward_list_ext(TIterator first, TIterator last, etl::ipool& node_pool, typename etl::enable_if<!etl::is_integral<TIterator>::value, int>::type = 0)
      : etl::iforward_list<T>(node_pool, node_pool.max_size(), true)
    {
      this->assign(first, last);
    }

#if ETL_HAS_INITIALIZER_LIST
    //*************************************************************************
    /// Construct from initializer_list.
    //*************************************************************************
    forward_list_ext(std::initializer_list<T> init, etl::ipool& node_pool)
      : etl::iforward_list<T>(node_pool, node_pool.max_size(), true)
    {
      this->assign(init.begin(), init.end());
    }
#endif

    //*************************************************************************
    /// Destructor.
    //*************************************************************************
    ~forward_list_ext()
    {
      this->initialise();
    }

    //*************************************************************************
    /// Assignment operator.
    //*************************************************************************
    forward_list_ext& operator = (const forward_list_ext& rhs)
    {
      if (&rhs != this)
      {
        this->assign(rhs.cbegin(), rhs.cend());
      }

      return *this;
    }

#if ETL_USING_CPP11
    //*************************************************************************
    /// Move assignment operator.
    //*************************************************************************
    forward_list_ext& operator = (forward_list_ext&& rhs)
    {
      this->move_container(etl::move(rhs));

      return *this;
    }
#endif

    //*************************************************************************
    /// Set the pool instance.
    //*************************************************************************
    void set_pool(etl::ipool& pool)
    {
      // Clear the list of any current elements.
      if (this->get_node_pool() != ETL_NULLPTR)
      {
        this->clear();
      }

      this->set_node_pool(pool);
    }

    //*************************************************************************
    /// Get the pool instance.
    //*************************************************************************
    etl::ipool& get_pool() const
    {
      return *this->p_node_pool;
    }
  };

  //*************************************************************************
  /// Equal operator.
  ///\param lhs Reference to the first forward_list.
  ///\param rhs Reference to the second forward_list.
  ///\return <b>true</b> if the arrays are equal, otherwise <b>false</b>.
  //*************************************************************************
  template <typename T>
  bool operator ==(const etl::iforward_list<T>& lhs, const etl::iforward_list<T>& rhs)
  {
    return (lhs.size() == rhs.size()) &&
      etl::equal(lhs.begin(), lhs.end(), rhs.begin());
  }

  //*************************************************************************
  /// Not equal operator.
  ///\param lhs Reference to the first forward_list.
  ///\param rhs Reference to the second forward_list.
  ///\return <b>true</b> if the arrays are not equal, otherwise <b>false</b>.
  //*************************************************************************
  template <typename T>
  bool operator !=(const etl::iforward_list<T>& lhs, const etl::iforward_list<T>& rhs)
  {
    return !(lhs == rhs);
  }

  //*************************************************************************
  /// Less than operator.
  ///\param lhs Reference to the first forward_list.
  ///\param rhs Reference to the second forward_list.
  ///\return <b>true</b> if the first forward_list is lexicographically less than the
  /// second, otherwise <b>false</b>.
  //*************************************************************************
  template <typename T>
  bool operator <(const etl::iforward_list<T>& lhs, const etl::iforward_list<T>& rhs)
  {
    return etl::lexicographical_compare(lhs.begin(), lhs.end(), rhs.begin(), rhs.end());
  }

  //*************************************************************************
  /// Greater than operator.
  ///\param lhs Reference to the first forward_list.
  ///\param rhs Reference to the second forward_list.
  ///\return <b>true</b> if the first forward_list is lexicographically greater than the
  /// second, otherwise <b>false</b>.
  //*************************************************************************
  template <typename T>
  bool operator >(const etl::iforward_list<T>& lhs, const etl::iforward_list<T>& rhs)
  {
    return (rhs < lhs);
  }

  //*************************************************************************
  /// Less than or equal operator.
  ///\param lhs Reference to the first forward_list.
  ///\param rhs Reference to the second forward_list.
  ///\return <b>true</b> if the first forward_list is lexicographically less than or equal
  /// to the second, otherwise <b>false</b>.
  //*************************************************************************
  template <typename T>
  bool operator <=(const etl::iforward_list<T>& lhs, const etl::iforward_list<T>& rhs)
  {
    return !(lhs > rhs);
  }

  //*************************************************************************
  /// Greater than or equal operator.
  ///\param lhs Reference to the first forward_list.
  ///\param rhs Reference to the second forward_list.
  ///\return <b>true</b> if the first forward_list is lexicographically greater than or
  /// equal to the second, otherwise <b>false</b>.
  //*************************************************************************
  template <typename T>
  bool operator >=(const etl::iforward_list<T>& lhs, const etl::iforward_list<T>& rhs)
  {
    return !(lhs < rhs);
  }
}

#include "private/minmax_pop.h"

#endif