fix: entity works

engine/include/engine/scene/scene.h

@@ -1,14 +1,13 @@
 #pragma once
 
 #include <entt/entt.hpp>
-#include <memory>
+#include "engine/export.h"
 
 namespace Engine {
 
 class Entity;
 
-class Scene {
-private:
+class ENGINE_API Scene {
     friend class Entity;
 public:
     Scene() = default;
@@ -19,25 +18,32 @@ private:
     friend class Renderer;
 };
 
-class Entity {
+class ENGINE_API Entity {
 public:
     Entity() = default;
     Entity(entt::entity entity, Scene* scene) : m_entity(entity), m_scene(scene) {}
     Entity(const Entity& other) = default;
 
     template<typename Type, typename... Args>
-    inline auto AddComponent(Args &&...args) {
+    auto AddComponent(Args &&...args) {
+        assert(this->m_entity != entt::null && "Entity is empty");
         assert(this->m_scene != nullptr && "Scene has not been assigned to the entity");
         return m_scene->m_registry.emplace<Type>(m_entity, std::forward<Args>(args)...);
     }
 
     template<typename Type>
-    [[nodiscard]] inline auto GetComponent() {
+    [[nodiscard]] auto GetComponent() const {
+        assert(this->m_entity != entt::null && "Entity is empty");
         assert(this->m_scene != nullptr && "Scene has not been assigned to the entity");
         return m_scene->m_registry.get<Type>(m_entity);
     }
+
+    template<typename Type>
+    [[nodiscard]] bool HasComponent() const {
+        return m_scene->m_registry.all_of<Type>(m_entity);
+    }
 private:
-    entt::entity m_entity { 0 };
+    entt::entity m_entity { entt::null };
     Scene *m_scene = nullptr;
 };