反向迭代器 模拟

反向迭代器 模拟

namespace sjy
{
	template <typename Iterator, typename Ref, typename Ptr>
	struct Reverse_iterator  
	{
		typedef Reverse_iterator<Iterator, Ref, Ptr> self;
		Reverse_iterator(Iterator it)
			:_it(it)
		{}
		
		bool operator!=(const self& other) const
		{
			return _it != other._it;
		}
		
		bool operator==(const self& other) const
		{
			return _it == other._it;
		}
		
		self& operator++()
		{
			--_it;
			return *this;
		}
		
		self& operator--()
		{
			++_it;
			return *this;
		}
		
		Ref operator*()
		{
			Iterator tmp(_it);
			return *(--tmp);
		}
		
		Ptr operator->()
		{
			return &(operator*());
		}
		
		/*成员变量*/
		Iterator _it;
	};
}