Class iterator

src/common/classes/objects_array.h:48–112

		typedef FB_SIZE_T size_type;

		class iterator
		{
			friend class ObjectsArray<T, A>;
			friend class const_iterator;
		private:
			ObjectsArray *lst;
			size_type pos;
			iterator(ObjectsArray *l, size_type p) : lst(l), pos(p) { }
		public:
			using iterator_category = std::forward_iterator_tag;
			using difference_type = std::ptrdiff_t;
			using value_type = T;
			using pointer = T*;
			using reference = T&;

			iterator() : lst(0), pos(0) { }
			iterator(const iterator& it) : lst(it.lst), pos(it.pos) { }

			iterator& operator++()
			{
				++pos;
				return (*this);
			}
			iterator operator++(int)
			{
				iterator tmp = *this;
				++pos;
				 return tmp;
			}
			iterator& operator--()
			{
				fb_assert(pos > 0);
				--pos;
				return (*this);
			}
			iterator operator--(int)
			{
				fb_assert(pos > 0);
				iterator tmp = *this;
				--pos;
				 return tmp;
			}
			T* operator->()
			{
				fb_assert(lst);
				T* pointer = lst->getPointer(pos);
				return pointer;
			}
			T& operator*()
			{
				fb_assert(lst);
				T* pointer = lst->getPointer(pos);
				return *pointer;
			}
			bool operator!=(const iterator& v) const
			{
				fb_assert(lst == v.lst);
				return lst ? pos != v.pos : true;