1 files changed, 100 insertions, 0 deletions
diff --git a/yage/entity/entity.h b/yage/entity/entity.h
new file mode 100644
index 00000000..26d391b5
--- /dev/null
+++ b/yage/entity/entity.h
@@ -0,0 +1,100 @@
+/** ---------------------------------------------------------------------------
+ * @file: entity.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+#pragma once
+
+#include <vector>
+#include <memory>
+
+namespace yage
+{
+
+class Space;
+class ComponentPool;
+
+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_;
+
+    std::vector<std::unique_ptr<ComponentPool>> components;
+};
+
+class BaseComponent {
+public:
+    typedef unsigned Group;
+
+protected:
+    static Group group_id_counter_;
+};
+
+template <typename Derived>
+class Component : public BaseComponent {
+private:
+    BaseComponent::Group group();
+};
+
+class ComponentPool {
+private:
+    std::vector<BaseComponent *> components_;
+};
+
+} // namespace yage