<commit_before>#ifndef GUARD_AVL_TREE_H
#define GUARD_AVL_TREE_H 1

#include <memory>
#include <algorithm>

#include <cstdio>
#include <cassert>

template <typename T>
struct avl_tree_node
{
	typedef T value_type;

	value_type value;
	avl_tree_node * parent, * left, * right;

	int8_t balance;

	avl_tree_node(const value_type & _value)
	  : value(_value)
	  , parent(nullptr)
	  , left(nullptr)
	  , right(nullptr)
	  , balance(0)
		{ }

	avl_tree_node(value_type && _value)
	  : value(std::move<T>(_value))
	  , parent(nullptr)
	  , left(nullptr)
	  , right(nullptr)
	  , balance(0)
		{ }

	~avl_tree_node()
		{ assert(left == nullptr && right == nullptr); }
};


//
// TODO - This class needs noexcept specifications
//
template <typename T,
          typename Compare = std::less<T>,<commit_msg>interface def for iterator<commit_after>#ifndef GUARD_AVL_TREE_H
#define GUARD_AVL_TREE_H 1

#include <memory>
#include <algorithm>
#include <iterator>

#include <cstdio>
#include <cassert>

// forward declaration
template <typename T, typename C, typename A> class avl_tree;

template <typename T>
struct avl_tree_node
{
	typedef T value_type;

	value_type value;
	avl_tree_node * parent, * left, * right;

	int8_t balance;

	avl_tree_node(const value_type & _value)
	  : value(_value)
	  , parent(nullptr)
	  , left(nullptr)
	  , right(nullptr)
	  , balance(0)
		{ }

	avl_tree_node(value_type && _value)
	  : value(std::move<T>(_value))
	  , parent(nullptr)
	  , left(nullptr)
	  , right(nullptr)
	  , balance(0)
		{ }

	~avl_tree_node()
		{ assert(left == nullptr && right == nullptr); }
};

enum class avl_iterator_orientation
{
	none,
	right,
	left,
	up,
	end
};

template <typename T, typename C, typename A>
class avl_tree_iterator
  : public std::iterator<std::bidirectional_iterator_tag, T>
{
 public:
	avl_tree_iterator();
	avl_tree_iterator(const avl_tree_iterator & other);

	~avl_tree_iterator();

	avl_tree_iterator & operator = (const avl_tree_iterator & other);

	bool operator == (const avl_tree_iterator & other);
	bool operator != (const avl_tree_iterator & other);

	avl_tree_iterator & operator ++ ();
	avl_tree_iterator & operator ++ (int);

	avl_tree_iterator & operator -- ();
	avl_tree_iterator & operator -- (int);

	const T & operator * () const;
	const T * operator -> () const;

	void swap(avl_tree_iterator & other);

 private:
	avl_tree<T, C, A> * container;
	avl_tree_node<T> * current;
	avl_iterator_orientation orientation;
};

template <typename T, typename C, typename A>
void swap(avl_tree_iterator<T, C, A> & a, avl_tree_iterator<T, C, A> & b)
	{ a.swap(b); }

//
// TODO - This class needs noexcept specifications
//
template <typename T,
          typename Compare = std::less<T>,
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