1
我将std::vector
的集合存储在std::tuple
中。但是,当我从元组中获取元素并对其进行修改时,我只修改返回的元素的副本。从std :: tuple获取副本而不是引用
template<typename... Ts>
class ComponentStore
{
public:
ComponentStore()
{
}
~ComponentStore()
{
}
template<typename T>
std::vector<T>& Get()
{
return std::get<std::vector<T>>(m_components);
}
private:
std::tuple<std::vector<Ts>...> m_components;
};
这是我计划如何使用ComponentStore
类:使用汽车本身
ecs::component::ComponentStore<ecs::component::Position, ecs::component::Velocity> comstore;
//Get the position vector
auto positionvec = comstore.Get<ecs::component::Position>();
//Add a new position
positionvec.emplace_back(ecs::component::Position{});
//Later on, get the position vector again
auto positionvec2 = comstore.Get<ecs::component::Position>();
//But it's empty??? this is wrong. It should have 1 element.