priority_queue.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2015 John Wellbelove, rlindeman
 
Permission is hereby granted, free of charge, to any person obtaining a copy
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#ifndef ETL_PRIORITY_QUEUE_INCLUDED
#define ETL_PRIORITY_QUEUE_INCLUDED
 
#include "platform.h"
#include "algorithm.h"
#include "error_handler.h"
#include "exception.h"
#include "functional.h"
#include "iterator.h"
#include "parameter_type.h"
#include "type_traits.h"
#include "utility.h"
#include "vector.h"
 
#include <stddef.h>
 
//*****************************************************************************
//*****************************************************************************
 
namespace etl
{
  //***************************************************************************
  //***************************************************************************
  class priority_queue_exception : public exception
  {
  public:
 
    priority_queue_exception(string_type reason_, string_type file_name_, numeric_type line_number_)
      : exception(reason_, file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class priority_queue_full : public etl::priority_queue_exception
  {
  public:
 
    priority_queue_full(string_type file_name_, numeric_type line_number_)
      : priority_queue_exception(ETL_ERROR_TEXT("priority_queue:full", ETL_PRIORITY_QUEUE_FILE_ID"A"), file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class priority_queue_iterator : public etl::priority_queue_exception
  {
  public:
 
    priority_queue_iterator(string_type file_name_, numeric_type line_number_)
      : priority_queue_exception(ETL_ERROR_TEXT("priority_queue:iterator", ETL_PRIORITY_QUEUE_FILE_ID"B"), file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class priority_queue_empty : public etl::priority_queue_exception
  {
  public:
 
    priority_queue_empty(string_type file_name_, numeric_type line_number_)
      : priority_queue_exception(ETL_ERROR_TEXT("priority_queue:empty", ETL_PRIORITY_QUEUE_FILE_ID"C"), file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename T, typename TContainer, typename TCompare = etl::less<T> >
  class ipriority_queue
  {
  public:
 
    typedef T          value_type;      
    typedef TContainer container_type;  
    typedef TCompare   compare_type;    
    typedef T&         reference;       
    typedef const T&   const_reference; 
#if ETL_USING_CPP11
    typedef T&& rvalue_reference; 
#endif
    typedef typename TContainer::size_type size_type; 
    typedef typename etl::iterator_traits< typename TContainer::iterator>::difference_type difference_type;
 
    //*************************************************************************
    //*************************************************************************
    reference top()
    {
      ETL_ASSERT_CHECK_EXTRA(!empty(), ETL_ERROR(priority_queue_empty));
      return container.front();
    }
 
    //*************************************************************************
    //*************************************************************************
    const_reference top() const
    {
      ETL_ASSERT_CHECK_EXTRA(!empty(), ETL_ERROR(priority_queue_empty));
      return container.front();
    }
 
    //*************************************************************************
    //*************************************************************************
    void push(const_reference value)
    {
      ETL_ASSERT(!full(), ETL_ERROR(etl::priority_queue_full));
 
      // Put element at end
      container.push_back(value);
      // Make elements in container into heap
      etl::push_heap(container.begin(), container.end(), compare);
    }
 
#if ETL_USING_CPP11
    //*************************************************************************
    //*************************************************************************
    void push(rvalue_reference value)
    {
      ETL_ASSERT(!full(), ETL_ERROR(etl::priority_queue_full));
 
      // Put element at end
      container.push_back(etl::move(value));
      // Make elements in container into heap
      etl::push_heap(container.begin(), container.end(), compare);
    }
#endif
 
#if ETL_USING_CPP11 && ETL_NOT_USING_STLPORT && !defined(ETL_PRIORITY_QUEUE_FORCE_CPP03_IMPLEMENTATION)
    //*************************************************************************
    //*************************************************************************
    template <typename... Args>
    void emplace(Args&&... args)
    {
      ETL_ASSERT(!full(), ETL_ERROR(etl::priority_queue_full));
 
      // Put element at end
      container.emplace_back(etl::forward<Args>(args)...);
      // Make elements in container into heap
      etl::push_heap(container.begin(), container.end(), compare);
    }
#else
    //*************************************************************************
    //*************************************************************************
    void emplace()
    {
      ETL_ASSERT(!full(), ETL_ERROR(etl::priority_queue_full));
 
      // Put element at end
      container.emplace_back();
      // Make elements in container into heap
      etl::push_heap(container.begin(), container.end(), compare);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T1>
    void emplace(const T1& value1)
    {
      ETL_ASSERT(!full(), ETL_ERROR(etl::priority_queue_full));
 
      // Put element at end
      container.emplace_back(value1);
      // Make elements in container into heap
      etl::push_heap(container.begin(), container.end(), compare);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T1, typename T2>
    void emplace(const T1& value1, const T2& value2)
    {
      ETL_ASSERT(!full(), ETL_ERROR(etl::priority_queue_full));
 
      // Put element at end
      container.emplace_back(value1, value2);
      // Make elements in container into heap
      etl::push_heap(container.begin(), container.end(), compare);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T1, typename T2, typename T3>
    void emplace(const T1& value1, const T2& value2, const T3& value3)
    {
      ETL_ASSERT(!full(), ETL_ERROR(etl::priority_queue_full));
 
      // Put element at end
      container.emplace_back(value1, value2, value3);
      // Make elements in container into heap
      etl::push_heap(container.begin(), container.end(), compare);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T1, typename T2, typename T3, typename T4>
    void emplace(const T1& value1, const T2& value2, const T3& value3, const T4& value4)
    {
      ETL_ASSERT(!full(), ETL_ERROR(etl::priority_queue_full));
 
      // Put element at end
      container.emplace_back(value1, value2, value3, value4);
      // Make elements in container into heap
      etl::push_heap(container.begin(), container.end(), compare);
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    template <typename TIterator>
    void assign(TIterator first, TIterator last)
    {
#if ETL_IS_DEBUG_BUILD
      difference_type d = etl::distance(first, last);
      ETL_ASSERT(d >= 0, ETL_ERROR(etl::priority_queue_iterator));
      ETL_ASSERT(static_cast<size_t>(d) <= max_size(), ETL_ERROR(etl::priority_queue_full));
#endif
 
      clear();
      container.assign(first, last);
      etl::make_heap(container.begin(), container.end(), compare);
    }
 
    //*************************************************************************
    //*************************************************************************
    void pop()
    {
      ETL_ASSERT_CHECK_PUSH_POP_OR_RETURN(!empty(), ETL_ERROR(priority_queue_empty));
      // Move largest element to end
      etl::pop_heap(container.begin(), container.end(), compare);
      // Actually remove largest element at end
      container.pop_back();
    }
 
    //*************************************************************************
    //*************************************************************************
    void pop_into(reference destination)
    {
      destination = ETL_MOVE(top());
      pop();
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type size() const
    {
      return container.size();
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type max_size() const
    {
      return container.max_size();
    }
 
    //*************************************************************************
    //*************************************************************************
    bool empty() const
    {
      return container.empty();
    }
 
    //*************************************************************************
    //*************************************************************************
    bool full() const
    {
      return container.size() == container.max_size();
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type available() const
    {
      return container.max_size() - container.size();
    }
 
    //*************************************************************************
    //*************************************************************************
    void clear()
    {
      container.clear();
    }
 
    //*************************************************************************
    //*************************************************************************
    ipriority_queue& operator=(const ipriority_queue& rhs)
    {
      if (&rhs != this)
      {
        clone(rhs);
      }
 
      return *this;
    }
 
#if ETL_USING_CPP11
    //*************************************************************************
    //*************************************************************************
    ipriority_queue& operator=(ipriority_queue&& rhs)
    {
      if (&rhs != this)
      {
        clear();
        move(etl::move(rhs));
      }
 
      return *this;
    }
#endif
 
  protected:
 
    //*************************************************************************
    //*************************************************************************
    void clone(const ipriority_queue& other)
    {
      assign(other.container.cbegin(), other.container.cend());
    }
 
#if ETL_USING_CPP11
    //*************************************************************************
    //*************************************************************************
    void move(ipriority_queue&& other)
    {
      while (!other.empty())
      {
        push(etl::move(other.top()));
        other.pop();
      }
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    ipriority_queue() {}
 
  private:
 
    // Disable copy construction.
    ipriority_queue(const ipriority_queue&);

    TContainer container;
 
    TCompare compare;
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename T, const size_t SIZE, typename TContainer = etl::vector<T, SIZE>,
            typename TCompare = etl::less<typename TContainer::value_type> >
  class priority_queue : public etl::ipriority_queue<T, TContainer, TCompare>
  {
  public:
 
    typedef typename TContainer::size_type size_type;
    typedef TContainer                     container_type;
 
    static ETL_CONSTANT size_type MAX_SIZE = size_type(SIZE);
 
    //*************************************************************************
    //*************************************************************************
    priority_queue()
      : etl::ipriority_queue<T, TContainer, TCompare>()
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    priority_queue(const priority_queue& rhs)
      : etl::ipriority_queue<T, TContainer, TCompare>()
    {
      etl::ipriority_queue<T, TContainer, TCompare>::clone(rhs);
    }
 
#if ETL_USING_CPP11
    //*************************************************************************
    //*************************************************************************
    priority_queue(priority_queue&& rhs)
      : etl::ipriority_queue<T, TContainer, TCompare>()
    {
      etl::ipriority_queue<T, TContainer, TCompare>::move(etl::move(rhs));
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    template <typename TIterator>
    priority_queue(TIterator first, TIterator last)
      : etl::ipriority_queue<T, TContainer, TCompare>()
    {
      etl::ipriority_queue<T, TContainer, TCompare>::assign(first, last);
    }
 
    //*************************************************************************
    //*************************************************************************
    ~priority_queue()
    {
      etl::ipriority_queue<T, TContainer, TCompare>::clear();
    }
 
    //*************************************************************************
    //*************************************************************************
    priority_queue& operator=(const priority_queue& rhs)
    {
      if (&rhs != this)
      {
        etl::ipriority_queue<T, TContainer, TCompare>::clone(rhs);
      }
 
      return *this;
    }
 
#if ETL_USING_CPP11
    //*************************************************************************
    //*************************************************************************
    priority_queue& operator=(priority_queue&& rhs)
    {
      if (&rhs != this)
      {
        etl::ipriority_queue<T, TContainer, TCompare>::clear();
        etl::ipriority_queue<T, TContainer, TCompare>::move(etl::move(rhs));
      }
 
      return *this;
    }
#endif
  };
 
  template <typename T, const size_t SIZE, typename TContainer, typename TCompare>
  ETL_CONSTANT typename priority_queue<T, SIZE, TContainer, TCompare>::size_type priority_queue<T, SIZE, TContainer, TCompare>::MAX_SIZE;
} // namespace etl
 
#endif