SITL: use #pragma once

For the general case, pragma once is better replacement for of include
guards. One line instead of three, less scopes to close in the end of
the file, no chance to having the outdated names in the define symbol.

libraries/SITL/SIM_Aircraft.h

@@ -17,8 +17,7 @@
   parent class for aircraft simulators
 */
 
-#ifndef _SIM_AIRCRAFT_H
-#define _SIM_AIRCRAFT_H
+#pragma once
 
 #include <AP_Math/AP_Math.h>
 
@@ -138,6 +137,3 @@ private:
 };
 
 } // namespace SITL
-
-#endif // _SIM_AIRCRAFT_H
-

libraries/SITL/SIM_Balloon.h

@@ -17,8 +17,7 @@
   balloon simulator class
 */
 
-#ifndef _SIM_BALLOON_H
-#define _SIM_BALLOON_H
+#pragma once
 
 #include "SIM_Aircraft.h"
 
@@ -49,5 +48,3 @@ private:
 };
 
 } // namespace SITL
-
-#endif // _SIM_BALLOON_H

libraries/SITL/SIM_CRRCSim.h

@@ -17,8 +17,7 @@
   simulator connection for ardupilot version of CRRCSim
 */
 
-#ifndef _SIM_CRRCSIM_H
-#define _SIM_CRRCSIM_H
+#pragma once
 
 #include <AP_HAL/utility/Socket.h>
 
@@ -79,5 +78,3 @@ private:
 };
 
 } // namespace SITL
-
-#endif // _SIM_CRRCSIM_H

libraries/SITL/SIM_Gazebo.h

@@ -17,8 +17,7 @@
   simulator connection for ardupilot version of Gazebo
 */
 
-#ifndef _SIM_GAZEBO_H
-#define _SIM_GAZEBO_H
+#pragma once
 
 #include <AP_HAL/utility/Socket.h>
 
@@ -71,5 +70,3 @@ private:
 };
 
 } // namespace SITL
-
-#endif // _SIM_GAZEBO_H

libraries/SITL/SIM_Gimbal.h

@@ -17,8 +17,7 @@
   gimbal simulator class
 */
 
-#ifndef _SIM_GIMBAL_H
-#define _SIM_GIMBAL_H
+#pragma once
 
 #include <AP_HAL/utility/Socket.h>
 
@@ -108,5 +107,3 @@ private:
 };
 
 }  // namespace SITL
-
-#endif // _SIM_GIMBAL_H

libraries/SITL/SIM_Helicopter.h

@@ -17,8 +17,7 @@
   helicopter simulator class
 */
 
-#ifndef _SIM_HELICOPTER_H
-#define _SIM_HELICOPTER_H
+#pragma once
 
 #include "SIM_Aircraft.h"
 
@@ -61,5 +60,3 @@ private:
 };
 
 } // namespace SITL
-
-#endif // _SIM_HELICOPTER_H

libraries/SITL/SIM_JSBSim.h

@@ -17,8 +17,7 @@
   simulator connection for ardupilot version of JSBSim
 */
 
-#ifndef _SIM_JSBSIM_H
-#define _SIM_JSBSIM_H
+#pragma once
 
 #include <AP_HAL/utility/Socket.h>
 
@@ -178,5 +177,3 @@ public:
 };
 
 } // namespace SITL
-
-#endif // _SIM_JSBSIM_H

libraries/SITL/SIM_Multicopter.h

@@ -17,8 +17,7 @@
   multicopter simulator class
 */
 
-#ifndef _SIM_MULTICOPTER_H
-#define _SIM_MULTICOPTER_H
+#pragma once
 
 #include "SIM_Aircraft.h"
 
@@ -82,5 +81,3 @@ private:
 };
 
 } // namespace SITL
-
-#endif // _SIM_MULTICOPTER_H

libraries/SITL/SIM_Rover.h

@@ -17,8 +17,7 @@
   rover simulator class
 */
 
-#ifndef _SIM_ROVER_H
-#define _SIM_ROVER_H
+#pragma once
 
 #include "SIM_Aircraft.h"
 
@@ -55,5 +54,3 @@ private:
 };
 
 } // namespace SITL
-
-#endif // _SIM_ROVER_H

libraries/SITL/SIM_Tracker.h

@@ -17,8 +17,7 @@
   antenna-tracker simulator class
 */
 
-#ifndef _SIM_TRACKER_H
-#define _SIM_TRACKER_H
+#pragma once
 
 #include "SIM_Aircraft.h"
 
@@ -59,5 +58,3 @@ private:
 };
 
 } // namespace SITL
-
-#endif

libraries/SITL/SIM_last_letter.h

@@ -17,8 +17,7 @@
   simulator connection for ardupilot version of last_letter
 */
 
-#ifndef _SIM_LAST_LETTER_H
-#define _SIM_LAST_LETTER_H
+#pragma once
 
 #include <AP_HAL/utility/Socket.h>
 
@@ -77,5 +76,3 @@ private:
 };
 
 } // namespace SITL
-
-#endif // _SIM_LAST_LETTER_H

libraries/SITL/SITL.h

@@ -1,7 +1,6 @@
 /// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
 
-#ifndef __SITL_H__
-#define __SITL_H__
+#pragma once
 
 #include <DataFlash/DataFlash.h>
 #include <GCS_MAVLink/GCS_MAVLink.h>
@@ -118,5 +117,3 @@ public:
 };
 
 } // namespace SITL
-
-#endif // __SITL_H__