Trying to merge with develop

lib/wal/sources/Scene/Scene.hpp

@@ -6,7 +6,9 @@
 #pragma once
 
 #include <vector>
+#include <list>
 #include <functional>
+#include <View/View.hpp>
 #include "Entity/Entity.hpp"
 
 namespace WAL
@@ -15,20 +17,51 @@ namespace WAL
 	class Scene
 	{
 	private:
+		static int _nextID;
+		//! @brief An ID representing this scene.
+		int _id = _nextID++;
+
 		//! @brief The list of registered entities
-		std::vector<Entity> _entities = {};
+		std::list<Entity> _entities = {};
+		//! @brief The list of cached views to update.
+		std::vector<std::shared_ptr<IView>> _views = {};
+
+		//! @brief Notify this scene that a component has been added to the given entity.
+		//! @param entity The entity with the new component
+		//! @param type The type of the component added.
+		void _componentAdded(Entity &entity, const std::type_index &type);
+		//! @brief Notify this scene that a component has been removed to the given entity.
+		//! @param entity The entity with the removed component
+		//! @param type The type of the component removed.
+		void _componentRemoved(const Entity &entity, const std::type_index &type);
+		//! @brief Remove an entity from every views.
+		//! @param entity The entity to remove.
+		void _entityRemoved(const Entity &entity);
 	public:
 		//! @brief Get the list of entities.
-		std::vector<Entity> &getEntities();
+		std::list<Entity> &getEntities();
 
-		//! @brief Add a new entity to the scene, you can use this method with the same arguments as the entity's constructor.
-		//! @return The current scene is returned to allow you to chain call.
-		template <class ...Params>
-		Entity &addEntity(Params &&...params)
+		//! @brief Add a new entity to the scene.
+		//! @param name The name of the created entity.
+		//! @return The created entity is returned.
+		Entity &addEntity(const std::string &name);
+
+		template<typename ...Components>
+		View<Components...> &view()
 		{
-			return this->_entities.emplace_back(std::forward<Params>(params)...);
+			static std::unordered_map<int, std::weak_ptr<View<Components...>>> cache;
+			auto existing = cache.find(this->_id);
+			if (existing != cache.end() && !existing->second.expired())
+				return *existing->second.lock();
+			auto view = std::make_shared<View<Components...>>(this->_entities);
+			this->_views.emplace_back(view);
+			cache.emplace(this->_id, view);
+			return *view;
 		}
 
+		//! @brief Delete entities marked as deleted.
+		void deleteMarkedEntities();
+
 		//! @brief A default constructor
 		Scene() = default;
 		//! @brief A scene is copy constructable
@@ -38,5 +71,7 @@ namespace WAL
 		//! @brief A scene is assignable
 		Scene &operator=(const Scene &);
 		Scene(Scene &&) = default;
+
+		friend Entity;
 	};
 } // namespace WAL