etl/src/private/pvoidvector.h

///\file

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

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

Copyright(c) 2016 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
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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
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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******************************************************************************/

#ifndef __ETL_PVOIDVECTOR__
#define __ETL_PVOIDVECTOR__

#define __ETL_IN_PVOIDVECTOR__

#include <iterator>
#include <algorithm>
#include <functional>
#include <stddef.h>

#include "../platform.h"
#include "../algorithm.h"
#include "vector_base.h"
#include "../type_traits.h"
#include "../error_handler.h"

#ifdef ETL_COMPILER_GCC
#pragma GCC diagnostic ignored "-Wunused-variable"
#endif

#ifdef ETL_COMPILER_MICROSOFT
#undef min
#endif

namespace etl
{
  //***************************************************************************
  /// The base class for void* vectors.
  ///\ingroup vector
  //***************************************************************************
  class pvoidvector : public vector_base
  {
  public:

    typedef void*                                 value_type;
    typedef void*&                                reference;
    typedef const void*&                          const_reference;
    typedef void**                                pointer;
    typedef const void**                          const_pointer;
    typedef void**                                iterator;
    typedef const void**                          const_iterator;
    typedef std::reverse_iterator<iterator>       reverse_iterator;
    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
    typedef size_t                                size_type;
    typedef typename std::iterator_traits<iterator>::difference_type difference_type;

  public:

    //*********************************************************************
    /// Returns an iterator to the beginning of the vector.
    ///\return An iterator to the beginning of the vector.
    //*********************************************************************
    iterator begin()
    {
      return p_buffer;
    }

    //*********************************************************************
    /// Returns a const_iterator to the beginning of the vector.
    ///\return A const iterator to the beginning of the vector.
    //*********************************************************************
    const_iterator begin() const
    {
      return const_iterator(p_buffer);
    }

    //*********************************************************************
    /// Returns an iterator to the end of the vector.
    ///\return An iterator to the end of the vector.
    //*********************************************************************
    iterator end()
    {
      return p_end;
    }

    //*********************************************************************
    /// Returns a const_iterator to the end of the vector.
    ///\return A const iterator to the end of the vector.
    //*********************************************************************
    const_iterator end() const
    {
      return const_iterator(p_end);
    }

    //*********************************************************************
    /// Returns a const_iterator to the beginning of the vector.
    ///\return A const iterator to the beginning of the vector.
    //*********************************************************************
    const_iterator cbegin() const
    {
      return const_iterator(p_buffer);
    }

    //*********************************************************************
    /// Returns a const_iterator to the end of the vector.
    ///\return A const iterator to the end of the vector.
    //*********************************************************************
    const_iterator cend() const
    {
      return const_iterator(p_end);
    }

    //*********************************************************************
    /// Returns an reverse iterator to the reverse beginning of the vector.
    ///\return Iterator to the reverse beginning of the vector.
    //*********************************************************************
    reverse_iterator rbegin()
    {
      return reverse_iterator(end());
    }

    //*********************************************************************
    /// Returns a const reverse iterator to the reverse beginning of the vector.
    ///\return Const iterator to the reverse beginning of the vector.
    //*********************************************************************
    const_reverse_iterator rbegin() const
    {
      return const_reverse_iterator(end());
    }

    //*********************************************************************
    /// Returns a reverse iterator to the end + 1 of the vector.
    ///\return Reverse iterator to the end + 1 of the vector.
    //*********************************************************************
    reverse_iterator rend()
    {
      return reverse_iterator(begin());
    }

    //*********************************************************************
    /// Returns a const reverse iterator to the end + 1 of the vector.
    ///\return Const reverse iterator to the end + 1 of the vector.
    //*********************************************************************
    const_reverse_iterator rend() const
    {
      return const_reverse_iterator(begin());
    }

    //*********************************************************************
    /// Returns a const reverse iterator to the reverse beginning of the vector.
    ///\return Const reverse iterator to the reverse beginning of the vector.
    //*********************************************************************
    const_reverse_iterator crbegin() const
    {
      return const_reverse_iterator(cend());
    }

    //*********************************************************************
    /// Returns a const reverse iterator to the end + 1 of the vector.
    ///\return Const reverse iterator to the end + 1 of the vector.
    //*********************************************************************
    const_reverse_iterator crend() const
    {
      return const_reverse_iterator(cbegin());
    }

    //*********************************************************************
    /// Resizes the vector.
    /// If asserts or exceptions are enabled and the new size is larger than the
    /// maximum then a vector_full is thrown.
    ///\param new_size The new size.
    //*********************************************************************
    void resize(size_t new_size)
    {
      ETL_ASSERT(new_size <= MAX_SIZE, ETL_ERROR(vector_full));

      p_end = p_buffer + new_size;
    }

    //*********************************************************************
    /// Resizes the vector.
    /// If asserts or exceptions are enabled and the new size is larger than the
    /// maximum then a vector_full is thrown.
    ///\param new_size The new size.
    ///\param value   The value to fill new elements with. Default = default constructed value.
    //*********************************************************************
    void resize(size_t new_size, value_type value)
    {
      ETL_ASSERT(new_size <= MAX_SIZE, ETL_ERROR(vector_full));

      pointer p_new_end = p_buffer + new_size;

      // Size up if necessary.
      if (p_end < p_new_end)
      {
        std::fill(p_end, p_new_end, value);
      }

      p_end = p_new_end;
    }

    //*********************************************************************
    /// Returns a reference to the value at index 'i'
    ///\param i The index.
    ///\return A reference to the value at index 'i'
    //*********************************************************************
    reference operator [](size_t i)
    {
      return p_buffer[i];
    }

    //*********************************************************************
    /// Returns a const reference to the value at index 'i'
    ///\param i The index.
    ///\return A const reference to the value at index 'i'
    //*********************************************************************
    const_reference operator [](size_t i) const
    {
      return const_reference(p_buffer[i]);
    }

    //*********************************************************************
    /// Returns a reference to the value at index 'i'
    /// If asserts or exceptions are enabled, emits an etl::vector_out_of_bounds if the index is out of range.
    ///\param i The index.
    ///\return A reference to the value at index 'i'
    //*********************************************************************
    reference at(size_t i)
    {
      ETL_ASSERT(i < size(), ETL_ERROR(vector_out_of_bounds));
      return p_buffer[i];
    }

    //*********************************************************************
    /// Returns a const reference to the value at index 'i'
    /// If asserts or exceptions are enabled, emits an etl::vector_out_of_bounds if the index is out of range.
    ///\param i The index.
    ///\return A const reference to the value at index 'i'
    //*********************************************************************
    const_reference at(size_t i) const
    {
      ETL_ASSERT(i < size(), ETL_ERROR(vector_out_of_bounds));
      return const_reference(p_buffer[i]);
    }

    //*********************************************************************
    /// Returns a reference to the first element.
    ///\return A reference to the first element.
    //*********************************************************************
    reference front()
    {
      return p_buffer[0];
    }

    //*********************************************************************
    /// Returns a const reference to the first element.
    ///\return A const reference to the first element.
    //*********************************************************************
    const_reference front() const
    {
      return const_reference(p_buffer[0]);
    }

    //*********************************************************************
    /// Returns a reference to the last element.
    ///\return A reference to the last element.
    //*********************************************************************
    reference back()
    {
      return *(p_end  -1);
    }

    //*********************************************************************
    /// Returns a const reference to the last element.
    ///\return A const reference to the last element.
    //*********************************************************************
    const_reference back() const
    {
      return const_reference(*(p_end - 1));
    }

    //*********************************************************************
    /// Returns a pointer to the beginning of the vector data.
    ///\return A pointer to the beginning of the vector data.
    //*********************************************************************
    pointer data()
    {
      return p_buffer;
    }

    //*********************************************************************
    /// Returns a const pointer to the beginning of the vector data.
    ///\return A const pointer to the beginning of the vector data.
    //*********************************************************************
    const_pointer data() const
    {
      return const_pointer(p_buffer);
    }

    //*********************************************************************
    /// Assigns values to the vector.
    /// If asserts or exceptions are enabled, emits vector_full if the vector does not have enough free space.
    /// If asserts or exceptions are enabled, emits vector_iterator if the iterators are reversed.
    ///\param first The iterator to the first element.
    ///\param last  The iterator to the last element + 1.
    //*********************************************************************
    template <typename TIterator>
    void assign(TIterator first, TIterator last)
    {
#if defined(ETL_DEBUG)
      difference_type count = std::distance(first, last);
      ETL_ASSERT(static_cast<size_t>(count) <= MAX_SIZE, ETL_ERROR(vector_full));
#endif

      initialise();

      while (first != last)
      {
        *p_end++ = const_cast<void*>(*first++);
      }
    }

    //*********************************************************************
    /// Assigns values to the vector.
    /// If asserts or exceptions are enabled, emits vector_full if the vector does not have enough free space.
    ///\param n     The number of elements to add.
    ///\param value The value to insert for each element.
    //*********************************************************************
    void assign(size_t n, value_type value)
    {
      initialise();

      ETL_ASSERT(n <= MAX_SIZE, ETL_ERROR(vector_full));

      for (size_t current_size = 0; current_size < n; ++current_size)
      {
        *p_end++ = value;
      }
    }

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

    //*************************************************************************
    /// Increases the size of the vector by one, but does not initialise the new element.
    /// If asserts or exceptions are enabled, throws a vector_full if the vector is already full.
    //*************************************************************************
    void push_back()
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(size() != MAX_SIZE, ETL_ERROR(vector_full));
#endif

      ++p_end;
    }

    //*********************************************************************
    /// Inserts a value at the end of the vector.
    /// If asserts or exceptions are enabled, emits vector_full if the vector is already full.
    ///\param value The value to add.
    //*********************************************************************
    void push_back(value_type value)
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(size() != MAX_SIZE, ETL_ERROR(vector_full));
#endif
      *p_end++ = value;
    }

    //*************************************************************************
    /// Removes an element from the end of the vector.
    /// Does nothing if the vector is empty.
    //*************************************************************************
    void pop_back()
    {
#if defined(ETL_CHECK_PUSH_POP)
      ETL_ASSERT(size() > 0, ETL_ERROR(vector_empty));
#endif
      --p_end;
    }

    //*********************************************************************
    /// Inserts a value to the vector.
    /// If asserts or exceptions are enabled, emits vector_full if the vector is already full.
    ///\param position The position to insert before.
    ///\param value    The value to insert.
    //*********************************************************************
    iterator insert(iterator position, value_type value)
    {
      ETL_ASSERT(size() + 1 <= MAX_SIZE, ETL_ERROR(vector_full));

      if (position != end())
      {
        ++p_end;
        std::copy_backward(position, end() - 1, end());
        *position = value;
      }
      else
      {
        *p_end++ = value;
      }

      return position;
    }

    //*********************************************************************
    /// Inserts 'n' values to the vector.
    /// If asserts or exceptions are enabled, emits vector_full if the vector does not have enough free space.
    ///\param position The position to insert before.
    ///\param n        The number of elements to add.
    ///\param value    The value to insert.
    //*********************************************************************
    void insert(iterator position, size_t n, value_type value)
    {
      ETL_ASSERT((size() + 1) <= MAX_SIZE, ETL_ERROR(vector_full));

      std::copy_backward(position, p_end, p_end + n);
      std::fill_n(position, n, value);

      p_end += n;
    }

    //*********************************************************************
    /// Inserts a range of values to the vector.
    /// If asserts or exceptions are enabled, emits vector_full if the vector does not have enough free space.
    /// For fundamental and pointer types.
    ///\param position The position to insert before.
    ///\param first    The first element to add.
    ///\param last     The last + 1 element to add.
    //*********************************************************************
    template <typename TIterator>
    void insert(iterator position, TIterator first, TIterator last)
    {
      size_t count = std::distance(first, last);

      ETL_ASSERT((size() + count) <= MAX_SIZE, ETL_ERROR(vector_full));

      std::copy_backward(position, p_end, p_end + count);
      std::copy(first, last, position);
      p_end += count;
    }
    
    //*********************************************************************
    /// Erases an element.
    ///\param i_element Iterator to the element.
    ///\return An iterator pointing to the element that followed the erased element.
    //*********************************************************************
    iterator erase(iterator i_element)
    {
      std::copy(i_element + 1, end(), i_element);
      --p_end;

      return i_element;
    }

    //*********************************************************************
    /// Erases a range of elements.
    /// The range includes all the elements between first and last, including the
    /// element pointed by first, but not the one pointed by last.
    ///\param first Iterator to the first element.
    ///\param last  Iterator to the last element.
    ///\return An iterator pointing to the element that followed the erased element.
    //*********************************************************************
    iterator erase(iterator first, iterator last)
    {
      std::copy(last, end(), first);
      size_t n_delete = std::distance(first, last);

      // Just adjust the count.
      p_end -= n_delete;

      return first;
    }

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

      return *this;
    }

    //*************************************************************************
    /// Gets the current size of the vector.
    ///\return The current size of the vector.
    //*************************************************************************
    size_type size() const
    {
      return size_t(p_end - p_buffer);
    }

    //*************************************************************************
    /// Checks the 'empty' state of the vector.
    ///\return <b>true</b> if empty.
    //*************************************************************************
    bool empty() const
    {
      return (p_end == p_buffer);
    }

    //*************************************************************************
    /// Checks the 'full' state of the vector.
    ///\return <b>true</b> if full.
    //*************************************************************************
    bool full() const
    {
      return size() == MAX_SIZE;
    }

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

  protected:

    //*********************************************************************
    /// Constructor.
    //*********************************************************************
    pvoidvector(void** p_buffer_, size_t MAX_SIZE)
      : vector_base(MAX_SIZE),
        p_buffer(p_buffer_),
        p_end(p_buffer_)
    {
    }

    //*********************************************************************
    /// Initialise the vector.
    //*********************************************************************
    void initialise()
    {
      p_end = p_buffer;
    }

    void** p_buffer;
    void** p_end;

  private:

    // Disable copy construction.
    pvoidvector(const pvoidvector&);
  };

  bool pvoidvector_equal(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool pvoidvector_not_equal(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool pvoidvector_less_than(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool pvoidvector_greater_than(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool pvoidvector_less_than_equal(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool pvoidvector_greater_than_equal(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);

  bool operator ==(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool operator !=(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool operator  <(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool operator  >(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool operator <=(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
  bool operator >=(const etl::pvoidvector& lhs, const etl::pvoidvector& rhs);
}

#ifdef ETL_COMPILER_MICROSOFT
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif

#undef __ETL_IN_PVOIDVECTOR__

#endif