4 files changed, 16 insertions, 17 deletions
diff --git a/src/crepe/api/GameObject.cpp b/src/crepe/api/GameObject.cpp
index 2592d2d..8a1a235 100644
--- a/src/crepe/api/GameObject.cpp
+++ b/src/crepe/api/GameObject.cpp
@@ -6,20 +6,21 @@
 using namespace crepe;
 using namespace std;
 
-GameObject::GameObject(uint32_t id, std::string name, std::string tag,
-					   Point position, double rotation, double scale)
-	: id(id) {
+GameObject::GameObject(uint32_t id, std::string name, std::string tag, const Point & position, double rotation, double scale) : id(id) {
 	ComponentManager & mgr = ComponentManager::get_instance();
 	mgr.add_component<Transform>(this->id, position, rotation, scale);
 	mgr.add_component<Metadata>(this->id, name, tag);
 }
 
-void GameObject::set_parent(GameObject & parent) {
+void GameObject::set_parent(const GameObject & parent) {
 	auto & mgr = ComponentManager::get_instance();
-	vector<reference_wrapper<Metadata>> thisMetadata
-		= mgr.get_components_by_id<Metadata>(this->id);
-	vector<reference_wrapper<Metadata>> parentMetadata
-		= mgr.get_components_by_id<Metadata>(parent.id);
-	thisMetadata.at(0).get().parent = parent.id;
-	parentMetadata.at(0).get().children.push_back(this->id);
+
+	// set parent on own Metadata component
+	vector<reference_wrapper<Metadata>> this_metadata = mgr.get_components_by_id<Metadata>(this->id);
+	this_metadata.at(0).get().parent = parent.id;
+
+	// add own id to children list of parent's Metadata component
+	vector<reference_wrapper<Metadata>> parent_metadata = mgr.get_components_by_id<Metadata>(parent.id);
+	parent_metadata.at(0).get().children.push_back(this->id);
 }
+
diff --git a/src/crepe/api/GameObject.h b/src/crepe/api/GameObject.h
index dcd33ad..4c87639 100644
--- a/src/crepe/api/GameObject.h
+++ b/src/crepe/api/GameObject.h
@@ -9,9 +9,8 @@ namespace crepe {
 
 class GameObject {
 public:
-	GameObject(uint32_t id, std::string name, std::string tag, Point position,
-			   double rotation, double scale);
-	void set_parent(GameObject & parent);
+	GameObject(uint32_t id, std::string name, std::string tag, const Point & position, double rotation, double scale);
+	void set_parent(const GameObject & parent);
 
 	template <typename T, typename... Args>
 	T & add_component(Args &&... args);
diff --git a/src/crepe/api/Transform.cpp b/src/crepe/api/Transform.cpp
index a80aff3..9c9bb06 100644
--- a/src/crepe/api/Transform.cpp
+++ b/src/crepe/api/Transform.cpp
@@ -8,11 +8,10 @@
 
 using namespace crepe;
 
-Transform::Transform(uint32_t game_id, Point point, double rot, double scale)
+Transform::Transform(uint32_t game_id, const Point & point, double rot, double scale)
 	: Component(game_id), position(point), rotation(rot), scale(scale) {
 	dbg_trace();
 }
 
 Transform::~Transform() { dbg_trace(); }
 
-int Transform::get_instances_max() const { return 1; }
diff --git a/src/crepe/api/Transform.h b/src/crepe/api/Transform.h
index f918115..557061b 100644
--- a/src/crepe/api/Transform.h
+++ b/src/crepe/api/Transform.h
@@ -14,9 +14,9 @@ class Transform : public Component {
 	// works similar (or the same) as those found in GLSL?
 
 public:
-	Transform(uint32_t id, Point, double, double);
+	Transform(uint32_t id, const Point &, double, double);
 	~Transform();
-	int get_instances_max() const;
+	virtual int get_instances_max() const { return 1; }
 	//! Translation (shift)
 	Point position;
 	//! Rotation, in radians