#pragma once

#include "ReverseIterator.Base.tlh"


//-----------------------------------------------------------------------------
//		RandomIterator
//		支持随机访问的迭代器
//-----------------------------------------------------------------------------
namespace ReverseIterator
{
	template <typename IterType>
	class __RandomIterator : public __BaseIterator <IterType>
	{
	public:
		///	之前的 Array::Iterator 有防护功能, 因此这里也限制过分的增减
		inline void Step (int delta)
		{
			if (delta > 0)
			{
				if (m_Index - delta < 0)
				{
					m_Index = -1;
					Iter = _end;
				}
				else
				{
					Iter += delta;
					m_Index -= delta;
				}
			}
			else
//			if (delta < 0)
			{
				if (m_Index - delta >= m_Count)
				{
					m_Index = m_Count;
					Iter = _end;
				}
				else
				{
					Iter += delta;
					m_Index -= delta;
				}
			}
		}

		inline void operator += (int NumberOfStep)
		{
			Step (NumberOfStep);
		}

		inline void operator -= (int NumberOfStep)
		{
			Step (-NumberOfStep);
		}

	};
}