diff --git a/include/stack_operations.h b/include/stack_operations.h
index a259d85..835868d 100644
--- a/include/stack_operations.h
+++ b/include/stack_operations.h
@@ -6,7 +6,7 @@
 /*   By: reasuke <reasuke@student.42tokyo.jp>       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/02/11 12:41:01 by reasuke           #+#    #+#             */
-/*   Updated: 2024/04/20 15:25:05 by reasuke          ###   ########.fr       */
+/*   Updated: 2024/04/20 15:40:33 by reasuke          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -15,15 +15,17 @@
 
 # include "push_swap.h"
 
+typedef void	t_operation(t_stack **);
+typedef void	t_dual_operation(t_stack **, t_stack **);
+
 void	push_stack(t_stack **p_s1, t_stack **p_s2);
 void	swap_stack(t_stack **p_stack);
 void	rotate_stack(t_stack **p_stack);
 void	reverse_rotate_stack(t_stack **p_stack);
 
-void	repeat_stack_operations(t_stack **p_st, int n,
-			void (*operation)(t_stack **));
+void	repeat_stack_operations(t_stack **p_st, int n, t_operation *op);
 void	repeat_dual_stack_operations(t_stack **p_a, t_stack **p_b, int n,
-			void (*operation)(t_stack **, t_stack **));
+			t_dual_operation *op);
 
 void	operate_sa(t_stack **p_a);
 void	operate_sb(t_stack **p_b);
diff --git a/src/stack_operations/repeat_dual_stack_operations.c b/src/stack_operations/repeat_dual_stack_operations.c
index eac74a8..3d959bf 100644
--- a/src/stack_operations/repeat_dual_stack_operations.c
+++ b/src/stack_operations/repeat_dual_stack_operations.c
@@ -6,15 +6,15 @@
 /*   By: reasuke <reasuke@student.42tokyo.jp>       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/02/10 19:22:50 by reasuke           #+#    #+#             */
-/*   Updated: 2024/04/20 15:25:42 by reasuke          ###   ########.fr       */
+/*   Updated: 2024/04/20 15:40:46 by reasuke          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "stack_operations.h"
 
 void	repeat_dual_stack_operations(t_stack **p_a, t_stack **p_b, int n,
-		void (*operation)(t_stack **, t_stack **))
+		t_dual_operation *op)
 {
 	while (n--)
-		operation(p_a, p_b);
+		op(p_a, p_b);
 }
diff --git a/src/stack_operations/repeat_stack_operations.c b/src/stack_operations/repeat_stack_operations.c
index 943c4a5..ec782f7 100644
--- a/src/stack_operations/repeat_stack_operations.c
+++ b/src/stack_operations/repeat_stack_operations.c
@@ -6,15 +6,14 @@
 /*   By: reasuke <reasuke@student.42tokyo.jp>       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/02/10 19:22:26 by reasuke           #+#    #+#             */
-/*   Updated: 2024/04/20 15:32:16 by reasuke          ###   ########.fr       */
+/*   Updated: 2024/04/20 15:39:53 by reasuke          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "stack_operations.h"
 
-void	repeat_stack_operations(t_stack **p_st, int n,
-		void (*operation)(t_stack **))
+void	repeat_stack_operations(t_stack **p_st, int n, t_operation *op)
 {
 	while (n--)
-		operation(p_st);
+		op(p_st);
 }