src/object: use forward declaration for dt

1 files changed, 2 insertions, 2 deletions

diff --git a/src/object.hpp b/src/object.hpp
index 4ada39d4..7b9ab019 100644
--- a/src/object.hpp
+++ b/src/object.hpp
@@ -71,7 +71,7 @@ struct object
     virtual object_type type() const noexcept = 0;
     virtual bool can_activate(size_t i) const;
     virtual bool activate(size_t i);
-    virtual void update(size_t i, Ns dt) = 0;
+    virtual void update(size_t i, const Ns& dt) = 0;
     virtual void rotate(size_t i, rotation r);
     virtual bool can_rotate(global_coords coord, rotation new_r, rotation old_r, Vector2b offset, Vector2b bbox_offset, Vector2ub bbox_size);
     virtual bool can_move_to(Vector2i delta, global_coords coord, Vector2b offset, Vector2b bbox_offset, Vector2ub bbox_aize);
@@ -91,7 +91,7 @@ struct object
 
     template<typename T>
     requires std::is_unsigned_v<T>
-    static uint32_t alloc_frame_time(Ns dt, T& accum, uint32_t hz, float speed);
+    static uint32_t alloc_frame_time(const Ns& dt, T& accum, uint32_t hz, float speed);
 
 protected:
     object(object_id id, class chunk& c, const object_proto& proto);