Switch from header guards to pragma once

src/probabilistic/BitVector.h

@@ -1,7 +1,6 @@
 // See the file "COPYING" in the main distribution directory for copyright.
 
-#ifndef PROBABILISTIC_BITVECTOR_H
-#define PROBABILISTIC_BITVECTOR_H
+#pragma once
 
 #include <iterator>
 #include <vector>
@@ -356,5 +355,3 @@ private:
 };
 
 }
-
-#endif

src/probabilistic/BloomFilter.h

@@ -1,7 +1,6 @@
 // See the file "COPYING" in the main distribution directory for copyright.
 
-#ifndef PROBABILISTIC_BLOOMFILTER_H
-#define PROBABILISTIC_BLOOMFILTER_H
+#pragma once
 
 #include <vector>
 
@@ -227,5 +226,3 @@ private:
 };
 
 }
-
-#endif

src/probabilistic/CardinalityCounter.h

@@ -1,7 +1,6 @@
 // See the file "COPYING" in the main distribution directory for copyright.
 
-#ifndef PROBABILISTIC_CARDINALITYCOUNTER_H
-#define PROBABILISTIC_CARDINALITYCOUNTER_H
+#pragma once
 
 #include <stdint.h>
 #include <memory>
@@ -186,5 +185,3 @@ private:
 };
 
 }
-
-#endif

src/probabilistic/CounterVector.h

@@ -1,7 +1,6 @@
 // See the file "COPYING" in the main distribution directory for copyright.
 
-#ifndef PROBABILISTIC_COUNTERVECTOR_H
-#define PROBABILISTIC_COUNTERVECTOR_H
+#pragma once
 
 #include <cstddef>
 #include <cstdint>
@@ -154,5 +153,3 @@ private:
 };
 
 }
-
-#endif

src/probabilistic/Hasher.h

@@ -1,7 +1,6 @@
 // See the file "COPYING" in the main distribution directory for copyright.
 
-#ifndef PROBABILISTIC_HASHER_H
-#define PROBABILISTIC_HASHER_H
+#pragma once
 
 #include <broker/data.hh>
 #include <broker/expected.hh>
@@ -258,5 +257,3 @@ private:
 };
 
 }
-
-#endif

src/probabilistic/Topk.h

@@ -1,7 +1,6 @@
 // See the file "COPYING" in the main distribution directory for copyright.
 
-#ifndef topk_h
-#define topk_h
+#pragma once
 
 #include <list>
 #include "Val.h"
@@ -173,5 +172,3 @@ private:
 };
 
 };
-
-#endif