Replace #define ... with pragma once

src/grid/GridData.h

@@ -1,5 +1,5 @@
-#ifndef GRIDDATA_H
-#define GRIDDATA_H
+#pragma once
+
 #include <string>
 #include <vector>
 #include <map>
@@ -23,4 +23,3 @@ namespace platform {
         std::map<std::string, json> grid;
     };
 } /* namespace platform */
-#endif /* GRIDDATA_H */

src/grid/GridSearch.h

@@ -1,5 +1,5 @@
-#ifndef GRIDSEARCH_H
-#define GRIDSEARCH_H
+#pragma once
+
 #include <string>
 #include <map>
 #include <mpi.h>
@@ -57,4 +57,3 @@ namespace platform {
         Timer timer; // used to measure the time of the whole process
     };
 } /* namespace platform */
-#endif /* GRIDSEARCH_H */