CustomAppFromOptions.py

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# Workaround for ROOT-10769
import warnings
 
with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    import cppyy
 
# - we have to load GaudiKernel get the base class
cppyy.gbl.gSystem.Load("libGaudiKernel.so")
 
# - pass to ROOT interpreter our code
cppyy.gbl.gInterpreter.Declare(
    r"""
#include <Gaudi/Application.h>
#include <iostream>
 
namespace Test {
  class CustomApp : public Gaudi::Application {
    using Application::Application;
    int run() override {
      std::cout << "=== Custom Application ===\n";
      return EXIT_SUCCESS;
    }
  };
}
DECLARE_COMPONENT(Test::CustomApp)
"""
)
 
# IMPORTANT: gaudirun.py must be invoked passing "--application=Test::CustomApp"