Adding some tests

lib/wal/sources/View/View.hpp

@@ -0,0 +1,65 @@
+//
+// Created by Zoe Roux on 2021-06-03.
+//
+
+
+#pragma once
+
+#include <vector>
+#include <tuple>
+#include <typeindex>
+#include <functional>
+#include "Entity/Entity.hpp"
+
+namespace WAL
+{
+	//! @brief A basic view used to manipulate view without knowing their type at compile time.
+	class BaseView
+	{
+	public:
+		//! @brief The list of entities in the view.
+		std::vector<std::reference_wrapper<Entity>> entities = {};
+
+		//! @brief The list of types that every entity of the view has.
+		std::vector<std::type_index> types = {};
+
+		size_t size()
+		{
+			return entities.size();
+		}
+
+		//! @brief A default destructor
+		~BaseView() = default;
+	protected:
+		//! @brief A basic view can't be constructed, you should use the View templated class.
+		BaseView() = default;
+		//! @brief A basic view can't be constructed, you should use the View templated class.
+		BaseView(const BaseView &) = default;
+		//! @brief A basic view can't be assigned. See the View template class.
+		BaseView &operator=(const BaseView &) = default;
+	};
+
+	//! @brief A view allowing one to easily access entities containing a set list of component.
+	//!        A view is always updated and only references to entities are kept.
+	template<typename ...Components>
+	class View : public BaseView
+	{
+	public:
+		//! @brief Construct a view from a list of entities.
+		//!        Those entities are never copied but references to them are kept internally.
+		explicit View(std::vector<Entity> &scene)
+		{
+			this->types = {typeid(Components)...};
+			std::copy_if(scene.begin(), scene.end(), std::back_inserter(this->entities), [](Entity &entity) {
+				return (entity.hasComponent<Components>() && ...);
+			});
+		}
+
+		//! @brief Copying a view is not possible since a view must be managed by a scene.
+		View(const View &) = delete;
+		//! @brief A default destructor
+		~View() = default;
+		//! @brief A view is not assignable.
+		View &operator=(const View &) = delete;
+	};
+}