gbatch_session.h

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#pragma once
 
// geant4
#include "G4UIsession.hh"
 
// c++
#include <fstream>
 
class GBatch_Session : public G4UIsession
{
public:
    GBatch_Session() {
        // Open the batch log files immediately so all subsequent Geant4 output is captured.
        logFile.open("gemc.log");
        errFile.open("gemc.err");
    }
 
    G4int ReceiveG4cout(const G4String& coutString) override {
        // Persist the message for post-run inspection...
        logFile << coutString << std::flush;
        // ...while also preserving real-time visibility on the terminal.
        std::cout << coutString << std::flush;
        return 0;
    }
 
    G4int ReceiveG4cerr(const G4String& cerrString) override {
        // Persist stderr separately so errors can be grepped/triaged independently of stdout.
        errFile << cerrString << std::flush;
        std::cerr << cerrString << std::flush;
        return 0;
    }
 
private:
    std::ofstream logFile; 
    std::ofstream errFile; 
};