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#pragma once
#include "component.h"
#include <functional>
#include <iostream>
#include <memory>
#include <vector>
namespace yage
{
/**
* The entity is currently just an unsigned integer, which may change to a
* class in the future.
*/
typedef unsigned int Entity;
/**
* Has to keep track of all the different entities and their current state.
*
* The key actions on an Entity are: deleting, creating.
*/
class EntityManager
{
public:
Entity create_entity();
EntityManager &delete_entity(Entity entity);
bool is_valid(Entity entity) const;
EntityManager &add_component(Entity entity,
std::unique_ptr<BaseComponent> &&component);
template <typename T>
EntityManager &each(std::function<void(T &)> update);
private:
Entity update_next_entity();
Entity next_entity_ = 0;
std::vector<ComponentGroup> component_group_;
std::vector<ComponentMask> component_masks_;
std::vector<Entity> deleted_;
};
template <typename T>
EntityManager &EntityManager::each(std::function<void(T &)> update)
{
T c;
auto id = static_cast<BaseComponent *>(&c)->getGroup();
for (auto it = component_group_[id].begin();
it != component_group_[id].end(); ++it) {
auto iteration = it - component_group_[id].begin();
if (is_valid(iteration) && component_masks_[iteration][id]) {
update(*static_cast<T *>((*it).get()));
}
}
return *this;
}
} // namespace yage
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