replace ifndefs with pragma once

gtsam_unstable/slam/AHRS.h

@@ -5,8 +5,7 @@
  *      Author: cbeall3
  */
 
-#ifndef AHRS_H_
-#define AHRS_H_
+#pragma once
 
 #include "Mechanization_bRn2.h"
 #include <gtsam_unstable/dllexport.h>
@@ -82,4 +81,3 @@ public:
 };
 
 } /* namespace gtsam */
-#endif /* AHRS_H_ */

wrap/pybind11/tests/object.h

@@ -1,5 +1,4 @@
-#if !defined(__OBJECT_H)
-#define __OBJECT_H
+#pragma once
 
 #include <atomic>
 #include "constructor_stats.h"
@@ -171,5 +170,3 @@ public:
 private:
     T *m_ptr;
 };
-
-#endif /* __OBJECT_H */