#pragma once

#include <utility.h>

class EntityManager;
class EntityMemoryPool;

class Entity;

class EntityView
{
private:
	friend class EntityManager;
	friend class EntityMemoryPool;

	EntityView() = delete;
	EntityView(index_t, index_t);
public:
	class iterator
	{
	public:
		iterator(index_t);
		iterator& operator++();
		iterator operator++(int);
		iterator& operator--();
		iterator operator--(int);
		Entity operator*();
		Entity operator[](int);
		bool operator==(iterator);
		bool operator!=(iterator);
	private:
		index_t m_currentEntity;
	};

	Entity operator[](index_t) const;

	iterator begin() { return iterator(m_start); }
	iterator end()   { return iterator(m_start + m_size); }

private:
	index_t m_start;
	index_t m_size;
};