[entity] Starting work on entity system.

1 files changed, 83 insertions, 0 deletions

diff --git a/yage/entity/entitymanager.h b/yage/entity/entitymanager.h
new file mode 100644
index 00000000..da125d94
--- /dev/null
+++ b/yage/entity/entitymanager.h
@@ -0,0 +1,83 @@
+/** ---------------------------------------------------------------------------
+ * @file: entitymanager.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef YAGE_ENGINE_ENTITYMANAGER_H
+#define YAGE_ENGINE_ENTITYMANAGER_H
+
+#include "entity.h"
+
+#include <vector>
+
+namespace yage
+{
+
+class Space;
+
+/**
+ * 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.
+     */
+    unsigned createEntity();
+
+    /**
+     * Creates an Entity and returns it.
+     *
+     * @return The entity that was created by the entity manager in the current
+     * space.
+     */
+    Entity createEntityInstance();
+
+private:
+    /**
+     * The next available handle to give to the user.
+     */
+    unsigned next_handle_;
+
+    /**
+     * The space that the entity manager belongs to.
+     */
+    Space *space_;
+
+    /**
+     * The entities in the current space.
+     */
+    std::vector<Entity> entities_;
+};
+
+} // namespace yage
+
+#endif