ITS: tracklet print

Signed-off-by: Felix Schlepper <felix.schlepper@cern.ch>

Author: f3sch

Detectors/ITSMFT/ITS/tracking/include/ITStracking/Tracklet.h

@@ -20,9 +20,13 @@
 #include "GPUCommonRtypes.h"
 #include "GPUCommonMath.h"
 #include "GPUCommonDef.h"
+#include "GPUCommonLogger.h"
 
 #ifndef GPUCA_GPUCODE_DEVICE
+#ifndef GPU_NO_FMT
 #include <string>
+#include <fmt/format.h>
+#endif
 #endif
 
 namespace o2::its
@@ -41,12 +45,12 @@ struct Tracklet final {
   GPUhdi() void dump() const;
   GPUhdi() void dump(const int, const int) const;
   GPUhdi() unsigned char operator<(const Tracklet&) const;
-#ifndef GPUCA_GPUCODE_DEVICE
+#if !defined(GPUCA_NO_FMT) && !defined(GPUCA_GPUCODE_DEVICE)
   std::string asString() const
   {
-    return "fClIdx: " + std::to_string(firstClusterIndex) + " sClIdx: " + std::to_string(secondClusterIndex) +
-           " rof1: " + std::to_string(rof[0]) + " rof2: " + std::to_string(rof[1]) + " delta: " + std::to_string(getDeltaRof());
+    return fmt::format("fClIdx:{} fROF:{} sClIdx:{} sROF:{} (DROF:{})", firstClusterIndex, rof[0], secondClusterIndex, rof[1], getDeltaRof());
   }
+  void print() const { LOG(info) << asString(); }
 #endif
 
   int firstClusterIndex{-1};