nullptr fixes

core/base/CbmDigiManager.h

@@ -23,13 +23,12 @@
 #include <boost/any.hpp>                  // for any_cast, bad_any_cast (ptr...
 #include <boost/exception/exception.hpp>  // for clone_impl, error_info_inje...
 
+#include <cassert>  // for assert
 #include <gsl/span>
 #include <iosfwd>  // for string
 #include <map>     // for map, map<>::mapped_type
 #include <vector>  // for vector
 
-#include <assert.h>  // for assert
-
 class CbmMatch;
 
 /** @brief CbmDigiManager

core/data/mvd/CbmMvdHit.h

@@ -53,7 +53,7 @@ public:
 
 
   /** Output to screen **/
-  virtual void Print(const Option_t* opt = 0) const;
+  virtual void Print(const Option_t* opt = nullptr) const;
 
 
   /** Accessors **/

reco/detectors/sts/CbmStsFindTracks.h

@@ -48,7 +48,7 @@ public:
    *@param finder   Pointer to STS track finder concrete class
    *@param useMvd   Include MVD hits in track finding
    **/
-  CbmStsFindTracks(Int_t iVerbose, CbmStsTrackFinder* finder = NULL, Bool_t useMvd = kTRUE,
+  CbmStsFindTracks(Int_t iVerbose, CbmStsTrackFinder* finder = nullptr, Bool_t useMvd = kTRUE,
                    const char* name = "STSFindTracks");