Move typedef

include/typedefs.hpp

@@ -35,4 +35,11 @@ typedef std::vector<sim_cols> sim_arr;
  * */
 typedef arma::vec::fixed<3> vec_3d;
 
+/** @brief Typedef for PenningTrap::simulation return value.
+ * */
+typedef struct simulation {
+    sim_arr r_vecs;
+    sim_arr v_vecs;
+} simulation_t;
+
 #endif