moved sgn function into separate file for reuse

Framework/Utilities/CMakeLists.txt

@@ -27,6 +27,7 @@ set (
   COMBoost.h
   Bit.h
   Singleton.h
+  sgn.h
   CorsikaFenv.h
   MetaProgramming.h
   )

Framework/Utilities/COMBoost.cc

@@ -14,17 +14,12 @@
 #include <corsika/geometry/Vector.h>
 #include <corsika/units/PhysicalUnits.h>
 #include <corsika/utl/COMBoost.h>
+#include <corsika/utl/sgn.h>
 
 using namespace corsika::utl;
 using namespace corsika::units::si;
 using namespace corsika::geometry;
 
-//! sign function without branches
-template <typename T>
-static int sgn(T val) {
-  return (T(0) < val) - (val < T(0));
-}
-
 COMBoost::COMBoost(FourVector<HEPEnergyType, Vector<hepmomentum_d>> const& Pprojectile,
                    const HEPMassType massTarget)
     : fCS(Pprojectile.GetSpaceLikeComponents().GetCoordinateSystem()) {

Framework/Utilities/sgn.h

+#ifndef _utilities_sgn_h
+#define _utilities_sgn_h
+
+namespace corsika::utl {
+
+//! sign function without branches
+template <typename T>
+static int sgn(T val) {
+  return (T(0) < val) - (val < T(0));
+}
+
+}
+
+#endif