etl/list_base.h

///\file

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

Embedded Template Library.

Copyright(c) 2014 jwellbelove

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
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The above copyright notice and this permission notice shall be included in all
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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
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SOFTWARE.
******************************************************************************/

#ifndef __ETL_IN_ILIST_H__
#error This header is a private element of etl::list & etl::ilist
#endif

#ifndef __ETL_LIST_BASE__
#define __ETL_LIST_BASE__

#include <stddef.h>
#include "exception.h"

namespace etl
{
  //***************************************************************************
  /// Exception for the list.
  ///\ingroup list
  //***************************************************************************
  class list_exception : public exception
  {
  public:

    list_exception(const char* what)
      : exception(what)
    {
    }
  };

  //***************************************************************************
  /// Full exception for the list.
  ///\ingroup list
  //***************************************************************************
  class list_full : public list_exception
  {
  public:

    list_full()
      : list_exception("list: full")
    {
    }
  };

  //***************************************************************************
  /// Iterator exception for the list.
  ///\ingroup list
  //***************************************************************************
  class list_iterator : public list_exception
  {
  public:

    list_iterator()
      : list_exception("list: iterator problem")
    {
    }
  };

  //***************************************************************************
  /// The base class for all lists.
  ///\ingroup list
  //***************************************************************************
  class list_base
  {
  public:

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

    //*************************************************************************
    /// Gets the size of the list.
    //*************************************************************************
    size_type size() const
    {
      return current_size;
    }

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

    //*************************************************************************
    /// Checks to see if the list is empty.
    //*************************************************************************
    bool empty() const
    {
      return current_size == 0;
    }

    //*************************************************************************
    /// Checks to see if the list is full.
    //*************************************************************************
    bool full() const
    {
      return current_size == MAX_SIZE;
    }

    //*************************************************************************
    /// Returns the remaining capacity.
    ///\return The remaining capacity.
    //*************************************************************************
    size_t available() const
    {
      return max_size() - size();
    }

  protected:

    //*************************************************************************
    /// The constructor that is called from derived classes.
    //*************************************************************************
    list_base(size_type max_size)
      : next_free(0),
        current_size(0),
        MAX_SIZE(max_size)

    {
    }

    size_type next_free;      ///< The index of the next free node.
    size_type current_size;   ///< The number of the used nodes.
    const size_type MAX_SIZE; ///< The maximum size of the list.
  };
}

#endif