Add attempt for Entity::GetComponent

src/entity_i.cpp

@@ -11,3 +11,10 @@ Component *Entity::AddComponent(Args &&...args) {
   components.push_back(std::make_unique(std::forward<Args>(args)...));
   return components.back().get();
 }
+
+template <typename CompT> Component *Entity::GetComponent() {
+  for (const auto &comp_ptr : components) {
+    if (auto *comp = dynamic_cast<CompT *>(comp_ptr.get()))
+      return comp;
+  }
+}