Hadr01.cc

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//
// $Id: Hadr01.cc 109185 2018-04-03 07:20:46Z gcosmo $
//
// -------------------------------------------------------------
//      GEANT4 Hadr01
//
//  Application demonstrating Geant4 hadronic physics:
//  beam interaction with a target
//
//  Authors: A.Bagulya, I.Gudowska, V.Ivanchenko, N.Starkov
//
//  Modified: 
//  29.12.2009 V.Ivanchenko introduced access to reference PhysLists
//
// -------------------------------------------------------------
//
//
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#include "G4RunManager.hh"
#include "G4UImanager.hh"
#include "Randomize.hh"

#include "DetectorConstruction.hh"
#include "PhysicsList.hh"
#include "G4PhysListFactory.hh"
#include "G4VModularPhysicsList.hh"
#include "PrimaryGeneratorAction.hh"
#include "PhysicsListMessenger.hh"

#include "RunAction.hh"
#include "EventAction.hh"
#include "StackingAction.hh"

#include "G4UIExecutive.hh"
#include "G4VisExecutive.hh"

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int main(int argc,char** argv) {

  //detect interactive mode (if no arguments) and define UI session
  G4UIExecutive* ui = nullptr;
  if (argc == 1) { ui = new G4UIExecutive(argc,argv); }

  //Construct the default run manager
  G4RunManager * runManager = new G4RunManager();

  //set mandatory initialization classes
  runManager->SetUserInitialization(new DetectorConstruction());

  G4PhysListFactory factory;
  G4VModularPhysicsList* phys = nullptr;
  PhysicsListMessenger* mess = nullptr;
  G4String physName = "";

  //Physics List name defined via 3nd argument
  if (argc==3) { physName = argv[2]; }

  // Physics List name defined via environment variable
  if("" == physName) {
    char* path = getenv("PHYSLIST");
    if (path) { physName = G4String(path); }
  }

  //reference PhysicsList via its name
  if ("" != physName && factory.IsReferencePhysList(physName)) {
    phys = factory.GetReferencePhysList(physName);

    // instantiated messenger
    mess = new PhysicsListMessenger();
  } 

  //local Physics List
  if(!phys) { phys = new PhysicsList(); }

  // define physics
  runManager->SetUserInitialization(phys);
  runManager->SetUserAction(new PrimaryGeneratorAction());

  //set user action classes
  runManager->SetUserAction(new RunAction());
  runManager->SetUserAction(new EventAction());
  runManager->SetUserAction(new StackingAction());

  //initialize visualization
  G4VisManager* visManager = nullptr;

  //get the pointer to the User Interface manager
  G4UImanager* UImanager = G4UImanager::GetUIpointer();  

  if (ui)  {
    //interactive mode
    visManager = new G4VisExecutive;
    visManager->Initialize();
    ui->SessionStart();
    delete ui;
  } else  {
    //batch mode  
    G4String command = "/control/execute ";
    G4String fileName = argv[1];
    UImanager->ApplyCommand(command+fileName);
  }

  //job termination 
  delete mess;
  delete visManager;
  delete runManager;
}

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