Use one call for all TPC digitization modes in DigitContainer

This addresses a review comment on the repeated fillOutputContainer calls.

- The eight cases now pass the mode as a type to one lambda.

https://its.cern.ch/jira/browse/O2-7309

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: sawenzel

Detectors/TPC/simulation/src/DigitContainer.cxx

@@ -16,6 +16,7 @@
 #include "TPCSimulation/DigitContainer.h"
 #include <atomic>
 #include <memory>
+#include <type_traits>
 #include <fairlogger/Logger.h>
 #include "TPCBase/Mapper.h"
 #include "TPCBaseRecSim/CDBInterface.h"
@@ -84,39 +85,37 @@ void DigitContainer::fillOutputContainer(std::vector<Digit>& output,
     // fmt::print("Processing secotor: {}, time bin: {}, mFirstTimeBin: {}, dgitTime: {}\n", sector.getSector(), timeBin, mFirstTimeBin, (void*)time);
 
     if (time) {
+      // the digitization mode is a template parameter of fillOutputContainer
+      auto fill = [&](auto mode) {
+        time->fillOutputContainer<decltype(mode)::value>(output, mcTruth, commonModeOutput, sector, timeBin, sampaProcessing, mLabelCollector, mPrevDigArr.get(), debugStream, mPadParams, mDeadMap);
+      };
+      using M = DigitzationMode;
       switch (digitizationMode) {
-        case DigitzationMode::FullMode: {
-          time->fillOutputContainer<DigitzationMode::FullMode>(output, mcTruth, commonModeOutput, sector, timeBin, sampaProcessing, mLabelCollector, mPrevDigArr.get(), debugStream, mPadParams, mDeadMap);
+        case M::FullMode:
+          fill(std::integral_constant<M, M::FullMode>{});
           break;
-        }
-        case DigitzationMode::ZeroSuppression: {
-          time->fillOutputContainer<DigitzationMode::ZeroSuppression>(output, mcTruth, commonModeOutput, sector, timeBin, sampaProcessing, mLabelCollector, mPrevDigArr.get(), debugStream, mPadParams, mDeadMap);
+        case M::ZeroSuppression:
+          fill(std::integral_constant<M, M::ZeroSuppression>{});
           break;
-        }
-        case DigitzationMode::ZeroSuppressionCMCorr: {
-          time->fillOutputContainer<DigitzationMode::ZeroSuppressionCMCorr>(output, mcTruth, commonModeOutput, sector, timeBin, sampaProcessing, mLabelCollector, mPrevDigArr.get(), debugStream, mPadParams, mDeadMap);
+        case M::ZeroSuppressionCMCorr:
+          fill(std::integral_constant<M, M::ZeroSuppressionCMCorr>{});
           break;
-        }
-        case DigitzationMode::SubtractPedestal: {
-          time->fillOutputContainer<DigitzationMode::SubtractPedestal>(output, mcTruth, commonModeOutput, sector, timeBin, sampaProcessing, mLabelCollector, mPrevDigArr.get(), debugStream, mPadParams, mDeadMap);
+        case M::SubtractPedestal:
+          fill(std::integral_constant<M, M::SubtractPedestal>{});
           break;
-        }
-        case DigitzationMode::NoSaturation: {
-          time->fillOutputContainer<DigitzationMode::NoSaturation>(output, mcTruth, commonModeOutput, sector, timeBin, sampaProcessing, mLabelCollector, mPrevDigArr.get(), debugStream, mPadParams, mDeadMap);
+        case M::NoSaturation:
+          fill(std::integral_constant<M, M::NoSaturation>{});
           break;
-        }
-        case DigitzationMode::PropagateADC: {
-          time->fillOutputContainer<DigitzationMode::PropagateADC>(output, mcTruth, commonModeOutput, sector, timeBin, sampaProcessing, mLabelCollector, mPrevDigArr.get(), debugStream, mPadParams, mDeadMap);
+        case M::PropagateADC:
+          fill(std::integral_constant<M, M::PropagateADC>{});
           break;
-        }
-        case DigitzationMode::Auto: {
+        case M::Auto:
           if (mCMCEnabled) {
-            time->fillOutputContainer<DigitzationMode::ZeroSuppressionCMCorr>(output, mcTruth, commonModeOutput, sector, timeBin, sampaProcessing, mLabelCollector, mPrevDigArr.get(), debugStream, mPadParams, mDeadMap);
+            fill(std::integral_constant<M, M::ZeroSuppressionCMCorr>{});
           } else {
-            time->fillOutputContainer<DigitzationMode::ZeroSuppression>(output, mcTruth, commonModeOutput, sector, timeBin, sampaProcessing, mLabelCollector, mPrevDigArr.get(), debugStream, mPadParams, mDeadMap);
+            fill(std::integral_constant<M, M::ZeroSuppression>{});
           }
           break;
-        }
       }
     }