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/** ---------------------------------------------------------------------------
* @file: entitymanager.h
*
* Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
* MIT License, see LICENSE file for more details.
* ----------------------------------------------------------------------------
*/
#pragma once
#include <vector>
namespace yage
{
class Space;
typedef unsigned int Entity;
/**
* Manages entities in a space.
*/
class EntityManager
{
public:
/**
* Default instance of an EntityManager.
*/
EntityManager() = default;
/**
* Creates an instance of the entity manager, which refers back to the space
* it was created in and belongs to.
*
* @param space Current space that the EntityManager belongs to.
*/
EntityManager(Space *space);
/**
* Creates an instance of the entitiy manager with an initial size.
*
* @param space Current space that the EntityManager belongs to.
* @param n Initial size of the EntityManager.
*/
EntityManager(Space *space, std::size_t n);
/**
* Creates an Entity and returns the handle to the entity, which can then be
* used by the user to do operations on it.
*
* @return The handle to the entity that was created in the space.
*/
Entity createEntity();
/**
* Delete an entity.
*/
void deleteEntity(Entity entity);
private:
/**
* The next available handle to give to the user.
*/
Entity next_entity_ = 0;
/**
* The space that the entity manager belongs to.
*/
Space *space_ = nullptr;
/**
* The entities in the current space.
*/
std::vector<Entity> entities_;
};
} // namespace yage
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