exampleB1.cc

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#include "ActionInitialization.hh"
#include "DetectorConstruction.hh"
 
#include <G4RunManagerFactory.hh>
#include <G4UImanager.hh>
#include <QBBC.hh>
 
#include <cerrno>
#include <cstdlib>
#include <iostream>
 
int main(int argc, char** argv) {
  // ── Run manager ───────────────────────────────────────────────────────────
 
  auto* runManager = G4RunManagerFactory::CreateRunManager(G4RunManagerType::Default);
 
  // ── User initializations ──────────────────────────────────────────────────
 
  runManager->SetUserInitialization(new B1::DetectorConstruction());
  runManager->SetUserInitialization(new QBBC(0)); // 0: suppress physics-list verbosity
  runManager->SetUserInitialization(new ActionInitialization());
 
  // ── UI manager ────────────────────────────────────────────────────────────
 
  G4UImanager* UImanager = G4UImanager::GetUIpointer();
 
  // Optional second argument: number of worker threads (must be set before
  // /run/initialize, which is the first command in the macro).
  if (argc > 2) {
    char* endptr  = nullptr;
    errno         = 0;
    long nthreads = std::strtol(argv[2], &endptr, 10);
    if (errno != 0 || endptr == argv[2] || *endptr != '\0' || nthreads <= 0) {
      std::cerr << "exampleB1: invalid nthreads argument '" << argv[2]
                << "' (must be a positive integer)\n";
      return 1;
    }
    int rc = UImanager->ApplyCommand(G4String("/run/numberOfThreads ") + G4String(argv[2]));
    if (rc != 0) {
      std::cerr << "exampleB1: /run/numberOfThreads command failed (code " << rc << ")\n";
      return 1;
    }
  }
 
  int exitCode = 0;
  if (argc > 1) {
    // Batch mode: execute the supplied macro file.
    G4String command  = "/control/execute ";
    G4String fileName = argv[1];
    exitCode          = UImanager->ApplyCommand(command + fileName);
  } else {
    // Minimal headless default: initialise and exit without running any events.
    exitCode = UImanager->ApplyCommand("/run/initialize");
  }
 
  delete runManager;
  return exitCode != 0 ? 1 : 0;
}