etl/src/reference_flat_map.h

///\file

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

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

Copyright(c) 2017 jwellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
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******************************************************************************/

#ifndef __ETL_REFERENCE_FLAT_MAP__
#define __ETL_REFERENCE_FLAT_MAP__

#include <stddef.h>

#include "platform.h"
#include "vector.h"
#include "error_handler.h"
#include "debug_count.h"
#include "type_traits.h"
#include "parameter_type.h"
#include "exception.h"
#include "static_assert.h"

#undef ETL_FILE
#define ETL_FILE "30"

//*****************************************************************************
///\defgroup reference_flat_map reference_flat_map
/// An reference_flat_map with the capacity defined at compile time.
/// Has insertion of O(N) and search of O(logN)
/// Duplicate entries are not allowed.
///\ingroup containers
//*****************************************************************************

namespace etl
{
  //***************************************************************************
  ///\ingroup reference_flat_map
  /// Exception base for reference_flat_maps
  //***************************************************************************
  class flat_map_exception : public etl::exception
  {
  public:

    flat_map_exception(string_type what, string_type file_name, numeric_type line_number)
      : exception(what, file_name, line_number)
    {
    }
  };

  //***************************************************************************
  ///\ingroup reference_flat_map
  /// Vector full exception.
  //***************************************************************************
  class flat_map_full : public etl::flat_map_exception
  {
  public:

    flat_map_full(string_type file_name, numeric_type line_number)
      : flat_map_exception(ETL_ERROR_TEXT("flat_map: full", ETL_FILE"A"), file_name, line_number)
    {
    }
  };

  //***************************************************************************
  ///\ingroup reference_flat_map
  /// Vector out of bounds exception.
  //***************************************************************************
  class flat_map_out_of_bounds : public etl::flat_map_exception
  {
  public:

    flat_map_out_of_bounds(string_type file_name, numeric_type line_number)
      : flat_map_exception(ETL_ERROR_TEXT("flat_map:bounds", ETL_FILE"B"), file_name, line_number)
    {
    }
  };

  //***************************************************************************
  /// The base class for specifically sized reference_flat_maps.
  /// Can be used as a reference type for all reference_flat_maps containing a specific type.
  ///\ingroup reference_flat_map
  //***************************************************************************
  template <typename TKey, typename TMapped, typename TKeyCompare = std::less<TKey> >
  class ireference_flat_map
  {
  public:

    typedef std::pair<const TKey, TMapped> value_type;

  protected:

    typedef etl::ivector<value_type*> lookup_t;

  public:

    typedef TKey              key_type;
    typedef TMapped           mapped_type;
    typedef TKeyCompare       key_compare;
    typedef value_type&       reference;
    typedef const value_type& const_reference;
    typedef value_type*       pointer;
    typedef const value_type* const_pointer;
    typedef size_t            size_type;

    //*************************************************************************
    class iterator : public std::iterator<std::bidirectional_iterator_tag, value_type>
    {
    public:

      friend class ireference_flat_map;

      iterator()
      {
      }

      iterator(typename lookup_t::iterator ilookup)
        : ilookup(ilookup)
      {
      }

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

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

      iterator& operator ++()
      {
        ++ilookup;
        return *this;
      }

      iterator operator ++(int)
      {
        iterator temp(*this);
        ++ilookup;
        return temp;
      }

      iterator& operator --()
      {
        --ilookup;
        return *this;
      }

      iterator operator --(int)
      {
        iterator temp(*this);
        --ilookup;
        return temp;
      }

      reference operator *()
      {
        return *(*ilookup);
      }

      const_reference operator *() const
      {
        return *(*ilookup);
      }

      pointer operator &()
      {
        return etl::addressof(*(*ilookup));
      }

      const_pointer operator &() const
      {
        return &(*(*ilookup));
      }

      pointer operator ->()
      {
        return etl::addressof(*(*ilookup));
      }

      const_pointer operator ->() const
      {
        return etl::addressof(*(*ilookup));
      }

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

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

    private:

      typename lookup_t::iterator ilookup;
    };

    //*************************************************************************
    class const_iterator : public std::iterator<std::bidirectional_iterator_tag, const value_type>
    {
    public:

      friend class ireference_flat_map;

      const_iterator()
      {
      }

      const_iterator(typename lookup_t::const_iterator ilookup)
        : ilookup(ilookup)
      {
      }

      const_iterator(const iterator& other)
        : ilookup(other.ilookup)
      {
      }

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

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

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

      const_iterator& operator ++()
      {
        ++ilookup;
        return *this;
      }

      const_iterator operator ++(int)
      {
        const_iterator temp(*this);
        ++ilookup;
        return temp;
      }

      const_iterator& operator --()
      {
        --ilookup;
        return *this;
      }

      const_iterator operator --(int)
      {
        const_iterator temp(*this);
        --ilookup;
        return temp;
      }

      const_reference operator *() const
      {
        return *(*ilookup);
      }

      const_pointer operator &() const
      {
        return etl::addressof(*(*ilookup));
      }

      const_pointer operator ->() const
      {
        return etl::addressof(*(*ilookup));
      }

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

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

    private:

      typename lookup_t::const_iterator ilookup;
    };

    typedef std::reverse_iterator<iterator>       reverse_iterator;
    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
    typedef typename std::iterator_traits<iterator>::difference_type difference_type;

  protected:

    typedef typename etl::parameter_type<TKey>::type key_parameter_t;

  private:

    //*********************************************************************
    /// How to compare elements and keys.
    //*********************************************************************
    class compare
    {
    public:

      bool operator ()(const value_type& element, key_type key) const
      {
        return key_compare()(element.first, key);
      }

      bool operator ()(key_type key, const value_type& element) const
      {
        return key_compare()(key, element.first);
      }
    };

  public:

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

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

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

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

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

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

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

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

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

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

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

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

    //*********************************************************************
    /// Returns a reference to the value at index 'key'
    ///\param i The index.
    ///\return A reference to the value at index 'key'
    //*********************************************************************
    mapped_type& operator [](key_parameter_t key)
    {
      iterator i_element = lower_bound(key);

      ETL_ASSERT(i_element != end(), ETL_ERROR(flat_map_out_of_bounds));

      return i_element->second;
    }

    //*********************************************************************
    /// Returns a const reference to the value at index 'key'
    ///\param i The index.
    ///\return A const reference to the value at index 'key'
    //*********************************************************************
    const mapped_type& operator [](key_parameter_t key) const
    {
      iterator i_element = lower_bound(key);

      ETL_ASSERT(i_element != end(), ETL_ERROR(flat_map_out_of_bounds));

      return i_element->second;
    }

    //*********************************************************************
    /// Returns a reference to the value at index 'key'
    /// If asserts or exceptions are enabled, emits an etl::flat_map_out_of_bounds if the key is not in the range.
    ///\param i The index.
    ///\return A reference to the value at index 'key'
    //*********************************************************************
    mapped_type& at(key_parameter_t key)
    {
      iterator i_element = lower_bound(key);

      ETL_ASSERT(i_element != end(), ETL_ERROR(flat_map_out_of_bounds));

      return i_element->second;
    }

    //*********************************************************************
    /// Returns a const reference to the value at index 'key'
    /// If asserts or exceptions are enabled, emits an etl::flat_map_out_of_bounds if the key is not in the range.
    ///\param i The index.
    ///\return A const reference to the value at index 'key'
    //*********************************************************************
    const mapped_type& at(key_parameter_t key) const
    {
      const_iterator i_element = lower_bound(key);

      ETL_ASSERT(i_element != end(), ETL_ERROR(flat_map_out_of_bounds));

      return i_element->second;
    }

    //*********************************************************************
    /// Assigns values to the reference_flat_map.
    /// If ETL_THROW_EXCEPTIONS & _DEBUG are defined, emits flat_map_full if the reference_flat_map does not have enough free space.
    /// If ETL_THROW_EXCEPTIONS & _DEBUG are defined, emits flat_map_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)
    {
      STATIC_ASSERT((etl::is_same<value_type, typename std::iterator_traits<TIterator>::value_type>::value), "Incompatible data for assign");

#if defined(ETL_DEBUG)
      difference_type count = std::distance(first, last);
      ETL_ASSERT(count <= difference_type(capacity()), ETL_ERROR(flat_map_full));
#endif

      clear();

      while (first != last)
      {
        insert(*first++);
      }
    }

    //*********************************************************************
    /// Inserts a value to the reference_flat_map.
    /// If asserts or exceptions are enabled, emits flat_map_full if the reference_flat_map is already full.
    ///\param value    The value to insert.
    //*********************************************************************
    std::pair<iterator, bool> insert(value_type& value)
    {
      iterator i_element = lower_bound(value.first);

      return insert_at(i_element, value);
    }

    //*********************************************************************
    /// Inserts a value to the reference_flat_map.
    /// If asserts or exceptions are enabled, emits flat_map_full if the reference_flat_map is already full.
    ///\param position The position to insert at.
    ///\param value    The value to insert.
    //*********************************************************************
    iterator insert(iterator position, value_type& value)
    {
      return insert(value).first;
    }

    //*********************************************************************
    /// Inserts a range of values to the reference_flat_map.
    /// If asserts or exceptions are enabled, emits flat_map_full if the reference_flat_map does not have enough free space.
    ///\param position The position to insert at.
    ///\param first    The first element to add.
    ///\param last     The last + 1 element to add.
    //*********************************************************************
    template <class TIterator>
    void insert(TIterator first, TIterator last)
    {
      while (first != last)
      {
        insert(*first++);
      }
    }

    //*********************************************************************
    /// Erases an element.
    ///\param key The key to erase.
    ///\return The number of elements erased. 0 or 1.
    //*********************************************************************
    size_t erase(key_parameter_t key)
    {
      iterator i_element = find(key);

      if (i_element == end())
      {
        return 0;
      }
      else
      {
        lookup.erase(i_element.ilookup);
        return 1;
      }
    }

    //*********************************************************************
    /// Erases an element.
    ///\param i_element Iterator to the element.
    //*********************************************************************
    void erase(iterator i_element)
    {
      lookup.erase(i_element.ilookup);
    }

    //*********************************************************************
    /// 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.
    //*********************************************************************
    void erase(iterator first, iterator last)
    {
      lookup.erase(first.ilookup, last.ilookup);
    }

    //*************************************************************************
    /// Clears the reference_flat_map.
    //*************************************************************************
    void clear()
    {
      erase(begin(), end());
    }

    //*********************************************************************
    /// Finds an element.
    ///\param key The key to search for.
    ///\return An iterator pointing to the element or end() if not found.
    //*********************************************************************
    iterator find(key_parameter_t key)
    {
      iterator itr = lower_bound(key);

      if (itr != end())
      {
        if (!key_compare()(itr->first, key) && !key_compare()(key, itr->first))
        {
          return itr;
        }
        else
        {
          return end();
        }
      }

      return end();
    }

    //*********************************************************************
    /// Finds an element.
    ///\param key The key to search for.
    ///\return An iterator pointing to the element or end() if not found.
    //*********************************************************************
    const_iterator find(key_parameter_t key) const
    {
      const_iterator itr = lower_bound(key);

      if (itr != end())
      {
        if (!key_compare()(itr->first, key) && !key_compare()(key, itr->first))
        {
          return itr;
        }
        else
        {
          return end();
        }
      }

      return end();
    }

    //*********************************************************************
    /// Counts an element.
    ///\param key The key to search for.
    ///\return 1 if the key exists, otherwise 0.
    //*********************************************************************
    size_t count(key_parameter_t key) const
    {
      return (find(key) == end()) ? 0 : 1;
    }

    //*********************************************************************
    /// Finds the lower bound of a key
    ///\param key The key to search for.
    ///\return An iterator.
    //*********************************************************************
    iterator lower_bound(key_parameter_t key)
    {
      return std::lower_bound(begin(), end(), key, compare());
    }

    //*********************************************************************
    /// Finds the lower bound of a key
    ///\param key The key to search for.
    ///\return An iterator.
    //*********************************************************************
    const_iterator lower_bound(key_parameter_t key) const
    {
      return std::lower_bound(cbegin(), cend(), key, compare());
    }

    //*********************************************************************
    /// Finds the upper bound of a key
    ///\param key The key to search for.
    ///\return An iterator.
    //*********************************************************************
    iterator upper_bound(key_parameter_t key)
    {
      return std::upper_bound(begin(), end(), key, compare());
    }

    //*********************************************************************
    /// Finds the upper bound of a key
    ///\param key The key to search for.
    ///\return An iterator.
    //*********************************************************************
    const_iterator upper_bound(key_parameter_t key) const
    {
      return std::upper_bound(begin(), end(), key, compare());
    }

    //*********************************************************************
    /// Finds the range of equal elements of a key
    ///\param key The key to search for.
    ///\return An iterator pair.
    //*********************************************************************
    std::pair<iterator, iterator> equal_range(key_parameter_t key)
    {
      iterator i_lower = std::lower_bound(begin(), end(), key, compare());

      return std::make_pair(i_lower, std::upper_bound(i_lower, end(), key, compare()));
    }

    //*********************************************************************
    /// Finds the range of equal elements of a key
    ///\param key The key to search for.
    ///\return An iterator pair.
    //*********************************************************************
    std::pair<const_iterator, const_iterator> equal_range(key_parameter_t key) const
    {
      const_iterator i_lower = std::lower_bound(cbegin(), cend(), key, compare());

      return std::make_pair(i_lower, std::upper_bound(i_lower, cend(), key, compare()));
    }

    //*************************************************************************
    /// Gets the current size of the reference_flat_map.
    ///\return The current size of the reference_flat_map.
    //*************************************************************************
    size_type size() const
    {
      return lookup.size();
    }

    //*************************************************************************
    /// Checks the 'empty' state of the reference_flat_map.
    ///\return <b>true</b> if empty.
    //*************************************************************************
    bool empty() const
    {
      return lookup.empty();
    }

    //*************************************************************************
    /// Checks the 'full' state of the reference_flat_map.
    ///\return <b>true</b> if full.
    //*************************************************************************
    bool full() const
    {
      return lookup.full();
    }

    //*************************************************************************
    /// Returns the capacity of the reference_flat_map.
    ///\return The capacity of the reference_flat_map.
    //*************************************************************************
    size_type capacity() const
    {
      return lookup.capacity();
    }

    //*************************************************************************
    /// Returns the maximum possible size of the reference_flat_map.
    ///\return The maximum size of the reference_flat_map.
    //*************************************************************************
    size_type max_size() const
    {
      return lookup.max_size();
    }

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

  protected:

    //*********************************************************************
    /// Constructor.
    //*********************************************************************
    ireference_flat_map(lookup_t& lookup_)
      : lookup(lookup_)
    {
    }

    //*********************************************************************
    /// Inserts a value to the reference_flat_map.
    ///\param i_element The place to insert.
    ///\param value     The value to insert.
    //*********************************************************************
    std::pair<iterator, bool> insert_at(iterator i_element, value_type& value)
    {
      std::pair<iterator, bool> result(end(), false);

      if (i_element == end())
      {
        // At the end.
        ETL_ASSERT(!lookup.full(), ETL_ERROR(flat_map_full));

        lookup.push_back(&value);
        result.first = --end();
        result.second = true;
      }
      else
      {
        // Not at the end.
        result.first = i_element;

        // Existing element?
        if (value.first != i_element->first)
        {
          // A new one.
          ETL_ASSERT(!lookup.full(), ETL_ERROR(flat_map_full));
          lookup.insert(i_element.ilookup, &value);
          result.second = true;
        }
      }

      return result;
    }

  private:

    // Disable copy construction and assignment.
    ireference_flat_map(const ireference_flat_map&);
    ireference_flat_map& operator = (const ireference_flat_map&);

    lookup_t& lookup;
  };

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

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

  //***************************************************************************
  /// A reference_flat_map implementation that uses a fixed size buffer.
  ///\tparam TKey     The key type.
  ///\tparam TValue   The value type.
  ///\tparam TCompare The type to compare keys. Default = std::less<TKey>
  ///\tparam MAX_SIZE_ The maximum number of elements that can be stored.
  ///\ingroup reference_flat_map
  //***************************************************************************
  template <typename TKey, typename TValue, const size_t MAX_SIZE_, typename TCompare = std::less<TKey> >
  class reference_flat_map : public ireference_flat_map<TKey, TValue, TCompare>
  {
  public:

    static const size_t MAX_SIZE = MAX_SIZE_;

    //*************************************************************************
    /// Constructor.
    //*************************************************************************
    reference_flat_map()
      : ireference_flat_map<TKey, TValue, TCompare>(lookup)
    {
    }

    //*************************************************************************
    /// Constructor, from an iterator range.
    ///\tparam TIterator The iterator type.
    ///\param first The iterator to the first element.
    ///\param last  The iterator to the last element + 1.
    //*************************************************************************
    template <typename TIterator>
    reference_flat_map(TIterator first, TIterator last)
      : ireference_flat_map<TKey, TValue, TCompare>(lookup)
    {
      ireference_flat_map<TKey, TValue, TCompare>::assign(first, last);
    }

    //*************************************************************************
    /// Destructor.
    //*************************************************************************
    ~reference_flat_map()
    {
      ireference_flat_map<TKey, TValue, TCompare>::clear();
    }

    //*************************************************************************
    /// Assignment operator.
    //*************************************************************************
    reference_flat_map& operator = (const reference_flat_map& rhs)
    {
      if (&rhs != this)
      {
        ireference_flat_map<TKey, TValue, TCompare>::assign(rhs.cbegin(), rhs.cend());
      }

      return *this;
    }

  private:

    reference_flat_map(const reference_flat_map&);

    typedef typename ireference_flat_map<TKey, TValue, TCompare>::value_type node_t;

    // The vector that stores pointers to the nodes.
    etl::vector<node_t*, MAX_SIZE> lookup;
  };

}

#undef ETL_FILE

#endif