reference_flat_set.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2017 John Wellbelove
 
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of this software and associated documentation files(the "Software"), to deal
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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#ifndef ETL_REFERENCE_FLAT_SET_INCLUDED
#define ETL_REFERENCE_FLAT_SET_INCLUDED
 
#include "platform.h"
#include "algorithm.h"
#include "error_handler.h"
#include "exception.h"
#include "functional.h"
#include "iterator.h"
#include "nth_type.h"
#include "pool.h"
#include "type_traits.h"
#include "utility.h"
#include "vector.h"
 
#include "private/comparator_is_transparent.h"
 
#include <stddef.h>
 
namespace etl
{
  //***************************************************************************
  //***************************************************************************
  class flat_set_exception : public exception
  {
  public:
 
    flat_set_exception(string_type reason_, string_type file_name_, numeric_type line_number_)
      : exception(reason_, file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class flat_set_full : public flat_set_exception
  {
  public:
 
    flat_set_full(string_type file_name_, numeric_type line_number_)
      : flat_set_exception(ETL_ERROR_TEXT("flat_set:full", ETL_REFERENCE_FLAT_SET_FILE_ID"A"), file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class flat_set_iterator : public flat_set_exception
  {
  public:
 
    flat_set_iterator(string_type file_name_, numeric_type line_number_)
      : flat_set_exception(ETL_ERROR_TEXT("flat_set:iterator", ETL_REFERENCE_FLAT_SET_FILE_ID"B"), file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename T, typename TKeyCompare = etl::less<T> >
  class ireference_flat_set
  {
  public:
 
    typedef T                 key_type;
    typedef T                 value_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;
 
  protected:
 
    typedef etl::ivector<value_type*> lookup_t;
 
  public:
 
    //*************************************************************************
    class iterator : public etl::iterator<ETL_OR_STD::bidirectional_iterator_tag, value_type>
    {
    public:
 
      friend class ireference_flat_set;
      friend class const_iterator;
 
      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*() const
      {
        return *(*ilookup);
      }
 
      pointer operator&() const
      {
        return etl::addressof(*(*ilookup));
      }
 
      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 etl::iterator<ETL_OR_STD::bidirectional_iterator_tag, const value_type>
    {
    public:
 
      friend class ireference_flat_set;
 
      const_iterator() {}
 
      const_iterator(typename lookup_t::const_iterator ilookup_)
        : ilookup(ilookup_)
      {
      }
 
      const_iterator(const typename ireference_flat_set::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;
    };
 
  protected:
 
    typedef typename etl::parameter_type<T>::type parameter_t;
 
  public:
 
    typedef ETL_OR_STD::reverse_iterator<iterator>                   reverse_iterator;
    typedef ETL_OR_STD::reverse_iterator<const_iterator>             const_reverse_iterator;
    typedef typename etl::iterator_traits<iterator>::difference_type difference_type;
 
    //*********************************************************************
    //*********************************************************************
    iterator begin()
    {
      return iterator(lookup.begin());
    }
 
    //*********************************************************************
    //*********************************************************************
    const_iterator begin() const
    {
      return const_iterator(lookup.begin());
    }
 
    //*********************************************************************
    //*********************************************************************
    iterator end()
    {
      return iterator(lookup.end());
    }
 
    //*********************************************************************
    //*********************************************************************
    const_iterator end() const
    {
      return const_iterator(lookup.end());
    }
 
    //*********************************************************************
    //*********************************************************************
    const_iterator cbegin() const
    {
      return const_iterator(lookup.cbegin());
    }
 
    //*********************************************************************
    //*********************************************************************
    const_iterator cend() const
    {
      return const_iterator(lookup.cend());
    }
 
    //*********************************************************************
    //*********************************************************************
    reverse_iterator rbegin()
    {
      return reverse_iterator(lookup.rbegin());
    }
 
    //*********************************************************************
    //*********************************************************************
    const_reverse_iterator rbegin() const
    {
      return const_reverse_iterator(lookup.rbegin());
    }
 
    //*********************************************************************
    //*********************************************************************
    reverse_iterator rend()
    {
      return reverse_iterator(lookup.rend());
    }
 
    //*********************************************************************
    //*********************************************************************
    const_reverse_iterator rend() const
    {
      return const_reverse_iterator(lookup.rend());
    }
 
    //*********************************************************************
    //*********************************************************************
    const_reverse_iterator crbegin() const
    {
      return const_reverse_iterator(lookup.crbegin());
    }
 
    //*********************************************************************
    //*********************************************************************
    const_reverse_iterator crend() const
    {
      return const_reverse_iterator(lookup.crend());
    }
 
    //*********************************************************************
    //*********************************************************************
    template <typename TIterator>
    void assign(TIterator first, TIterator last)
    {
#if ETL_IS_DEBUG_BUILD
      difference_type d = etl::distance(first, last);
      ETL_ASSERT(d <= difference_type(capacity()), ETL_ERROR(flat_set_full));
#endif
 
      clear();
 
      while (first != last)
      {
        insert(*first);
        ++first;
      }
    }
 
    //*********************************************************************
    //*********************************************************************
    ETL_OR_STD::pair<iterator, bool> insert(reference value)
    {
      iterator i_element = lower_bound(value);
 
      return insert_at(i_element, value);
    }
 
    //*********************************************************************
    //*********************************************************************
    iterator insert(const_iterator /*position*/, reference value)
    {
      return insert(value).first;
    }
 
    //*********************************************************************
    //*********************************************************************
    template <class TIterator>
    void insert(TIterator first, TIterator last)
    {
      while (first != last)
      {
        insert(*first);
        ++first;
      }
    }
 
    //*********************************************************************
    //*********************************************************************
    size_t erase(parameter_t key)
    {
      iterator i_element = find(key);
 
      if (i_element == end())
      {
        return 0;
      }
      else
      {
        lookup.erase(i_element.ilookup);
        return 1;
      }
    }
 
    //*********************************************************************
#if ETL_USING_CPP11
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    size_t erase(K&& key)
    {
      iterator i_element = find(etl::forward<K>(key));
 
      if (i_element == end())
      {
        return 0;
      }
      else
      {
        lookup.erase(i_element.ilookup);
        return 1;
      }
    }
#endif
 
    //*********************************************************************
    //*********************************************************************
    iterator erase(iterator i_element)
    {
      return lookup.erase(i_element.ilookup);
    }
 
    //*********************************************************************
    //*********************************************************************
    iterator erase(const_iterator i_element)
    {
      return lookup.erase(i_element.ilookup);
    }
 
    //*********************************************************************
    //*********************************************************************
    iterator erase(const_iterator first, const_iterator last)
    {
      return lookup.erase(first.ilookup, last.ilookup);
    }
 
    //*************************************************************************
    //*************************************************************************
    void clear()
    {
      lookup.clear();
    }
 
    //*********************************************************************
    //*********************************************************************
    iterator find(parameter_t key)
    {
      iterator itr = etl::lower_bound(begin(), end(), key, compare);
 
      if (itr != end())
      {
        if (!key_compare()(*itr, key) && !key_compare()(key, *itr))
        {
          return itr;
        }
        else
        {
          return end();
        }
      }
 
      return end();
    }
 
#if ETL_USING_CPP11
    //*********************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    iterator find(const K& key)
    {
      iterator itr = etl::lower_bound(begin(), end(), key, compare);
 
      if (itr != end())
      {
        if (!key_compare()(*itr, key) && !key_compare()(key, *itr))
        {
          return itr;
        }
        else
        {
          return end();
        }
      }
 
      return end();
    }
#endif
 
    //*********************************************************************
    //*********************************************************************
    const_iterator find(parameter_t key) const
    {
      const_iterator itr = etl::lower_bound(begin(), end(), key, compare);
 
      if (itr != end())
      {
        if (!key_compare()(*itr, key) && !key_compare()(key, *itr))
        {
          return itr;
        }
        else
        {
          return end();
        }
      }
 
      return end();
    }
 
#if ETL_USING_CPP11
    //*********************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    const_iterator find(const K& key) const
    {
      const_iterator itr = etl::lower_bound(begin(), end(), key, compare);
 
      if (itr != end())
      {
        if (!key_compare()(*itr, key) && !key_compare()(key, *itr))
        {
          return itr;
        }
        else
        {
          return end();
        }
      }
 
      return end();
    }
#endif
 
    //*********************************************************************
    //*********************************************************************
    size_t count(parameter_t key) const
    {
      return (find(key) == end()) ? 0 : 1;
    }
 
#if ETL_USING_CPP11
    //*********************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    size_t count(const K& key) const
    {
      return (find(key) == end()) ? 0 : 1;
    }
#endif
 
    //*********************************************************************
    //*********************************************************************
    iterator lower_bound(parameter_t key)
    {
      return etl::lower_bound(begin(), end(), key, compare);
    }
 
#if ETL_USING_CPP11
    //*********************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    iterator lower_bound(const K& key)
    {
      return etl::lower_bound(begin(), end(), key, compare);
    }
#endif
 
    //*********************************************************************
    //*********************************************************************
    const_iterator lower_bound(parameter_t key) const
    {
      return etl::lower_bound(cbegin(), cend(), key, compare);
    }
 
#if ETL_USING_CPP11
    //*********************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    const_iterator lower_bound(const K& key) const
    {
      return etl::lower_bound(cbegin(), cend(), key, compare);
    }
#endif
 
    //*********************************************************************
    //*********************************************************************
    iterator upper_bound(parameter_t key)
    {
      return etl::upper_bound(begin(), end(), key, compare);
    }
 
#if ETL_USING_CPP11
    //*********************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    iterator upper_bound(const K& key)
    {
      return etl::upper_bound(begin(), end(), key, compare);
    }
#endif
 
    //*********************************************************************
    //*********************************************************************
    const_iterator upper_bound(parameter_t key) const
    {
      return etl::upper_bound(cbegin(), cend(), key, compare);
    }
 
#if ETL_USING_CPP11
    //*********************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    const_iterator upper_bound(const K& key) const
    {
      return etl::upper_bound(cbegin(), cend(), key, compare);
    }
#endif
 
    //*********************************************************************
    //*********************************************************************
    ETL_OR_STD::pair<iterator, iterator> equal_range(parameter_t key)
    {
      return etl::equal_range(begin(), end(), key, compare);
    }
 
#if ETL_USING_CPP11
    //*********************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    ETL_OR_STD::pair<iterator, iterator> equal_range(const K& key)
    {
      return etl::equal_range(begin(), end(), key, compare);
    }
#endif
 
    //*********************************************************************
    //*********************************************************************
    ETL_OR_STD::pair<const_iterator, const_iterator> equal_range(parameter_t key) const
    {
      return etl::upper_bound(cbegin(), cend(), key, compare);
    }
 
#if ETL_USING_CPP11
    //*********************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    ETL_OR_STD::pair<const_iterator, const_iterator> equal_range(const K& key) const
    {
      return etl::upper_bound(cbegin(), cend(), key, compare);
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    bool contains(parameter_t key) const
    {
      return find(key) != end();
    }
 
#if ETL_USING_CPP11
    //*************************************************************************
    template <typename K, typename KC = TKeyCompare, etl::enable_if_t<comparator_is_transparent<KC>::value, int> = 0>
    bool contains(const K& k) const
    {
      return find(k) != end();
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    size_type size() const
    {
      return lookup.size();
    }
 
    //*************************************************************************
    //*************************************************************************
    bool empty() const
    {
      return lookup.empty();
    }
 
    //*************************************************************************
    //*************************************************************************
    bool full() const
    {
      return lookup.full();
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type capacity() const
    {
      return lookup.capacity();
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type max_size() const
    {
      return lookup.max_size();
    }
 
    //*************************************************************************
    //*************************************************************************
    size_t available() const
    {
      return lookup.available();
    }
 
  protected:
 
    //*********************************************************************
    //*********************************************************************
    ireference_flat_set(lookup_t& lookup_)
      : lookup(lookup_)
    {
    }
 
    //*********************************************************************
    //*********************************************************************
    ETL_OR_STD::pair<iterator, bool> insert_at(iterator i_element, reference value)
    {
      ETL_OR_STD::pair<iterator, bool> result(end(), false);
 
      if (i_element == end())
      {
        // At the end.
        ETL_ASSERT(!lookup.full(), ETL_ERROR(flat_set_full));
 
        lookup.push_back(&value);
        result.first  = --end();
        result.second = true;
      }
      else
      {
        // Not at the end.
        result.first = i_element;
 
        // Existing element?
        if (compare(value, *i_element) || compare(*i_element, value))
        {
          // A new one.
          ETL_ASSERT(!lookup.full(), ETL_ERROR(flat_set_full));
          lookup.insert(i_element.ilookup, &value);
          result.second = true;
        }
      }
 
      return result;
    }
 
  private:
 
    // Disable copy construction.
    ireference_flat_set(const ireference_flat_set&);
    ireference_flat_set& operator=(const ireference_flat_set&);
 
    lookup_t& lookup;
 
    TKeyCompare compare;
 
    //*************************************************************************
    //*************************************************************************
#if defined(ETL_POLYMORPHIC_REFERENCE_FLAT_SET) || defined(ETL_POLYMORPHIC_CONTAINERS)
 
  public:
 
    virtual ~ireference_flat_set() {}
#else
 
  protected:
 
    ~ireference_flat_set() {}
#endif
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename TKey, const size_t MAX_SIZE_, typename TKeyCompare = etl::less<TKey> >
  class reference_flat_set : public ireference_flat_set<TKey, TKeyCompare>
  {
  public:
 
    static ETL_CONSTANT size_t MAX_SIZE = MAX_SIZE_;
 
    using typename ireference_flat_set<TKey, TKeyCompare>::value_type;
 
    //*************************************************************************
    //*************************************************************************
    reference_flat_set()
      : ireference_flat_set<TKey, TKeyCompare>(lookup)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    reference_flat_set(const reference_flat_set& other)
      : ireference_flat_set<TKey, TKeyCompare>(lookup)
    {
      ireference_flat_set<TKey, TKeyCompare>::assign(other.cbegin(), other.cend());
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename TIterator>
    reference_flat_set(TIterator first, TIterator last)
      : ireference_flat_set<TKey, TKeyCompare>(lookup)
    {
      ireference_flat_set<TKey, TKeyCompare>::assign(first, last);
    }
 
    //*************************************************************************
    //*************************************************************************
    ~reference_flat_set()
    {
      ireference_flat_set<TKey, TKeyCompare>::clear();
    }
 
  private:
 
    // The vector that stores pointers to the nodes.
    etl::vector<value_type*, MAX_SIZE> lookup;
  };
 
  template <typename TKey, const size_t MAX_SIZE_, typename TCompare>
  ETL_CONSTANT size_t reference_flat_set<TKey, MAX_SIZE_, TCompare>::MAX_SIZE;
 
  //*************************************************************************
  //*************************************************************************
#if ETL_USING_CPP17 && ETL_HAS_INITIALIZER_LIST
  template <typename... T>
  reference_flat_set(T...) -> reference_flat_set<etl::nth_type_t<0, T...>, sizeof...(T)>;
#endif
 
  //*************************************************************************
  //*************************************************************************
#if ETL_USING_CPP11 && ETL_HAS_INITIALIZER_LIST
  template <typename TKey, typename TKeyCompare = etl::less<TKey>, typename... T>
  constexpr auto make_reference_flat_set(T&&... keys) -> etl::reference_flat_set<TKey, sizeof...(T), TKeyCompare>
  {
    return {etl::forward<T>(keys)...};
  }
#endif
 
  //***************************************************************************
  //***************************************************************************
  template <typename T, typename TKeyCompare>
  bool operator==(const etl::ireference_flat_set<T, TKeyCompare>& lhs, const etl::ireference_flat_set<T, TKeyCompare>& rhs)
  {
    return (lhs.size() == rhs.size()) && etl::equal(lhs.begin(), lhs.end(), rhs.begin());
  }
 
  //***************************************************************************
  //***************************************************************************
  template <typename T, typename TKeyCompare>
  bool operator!=(const etl::ireference_flat_set<T, TKeyCompare>& lhs, const etl::ireference_flat_set<T, TKeyCompare>& rhs)
  {
    return !(lhs == rhs);
  }
} // namespace etl
 
#endif