HepRndmBaseEngine.h

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//====================================================================
//  CLHEP Basic Random Engine definition file
//--------------------------------------------------------------------
//
//  Package    : HepRndm ( The LHCb Offline System)
//  Author     : M.Frank
//  History    :
// +---------+----------------------------------------------+---------
// |    Date |                 Comment                      | Who
// +---------+----------------------------------------------+---------
// | 29/10/99| Initial version                              | MF
// +---------+----------------------------------------------+---------
//
//====================================================================
#ifndef HEPRNDM_HEPRNDMBASEENGINE_H
#define HEPRNDM_HEPRNDMBASEENGINE_H 1

// Framework include files
#include "RndmEngine.h"
#include "CLHEP/Random/Random.h"

// Forward declarations
namespace CLHEP {
  class HepRandomEngine;
}

namespace HepRndm  {

  class BaseEngine : public RndmEngine {
  protected:
    std::unique_ptr<CLHEP::HepRandomEngine>  m_hepEngine;
  public:
    BaseEngine(const std::string& name, ISvcLocator* loc)
    : RndmEngine( name, loc ) { }
    ~BaseEngine() override = default;
    CLHEP::HepRandomEngine*  hepEngine() { return m_hepEngine.get(); }
    const CLHEP::HepRandomEngine*  hepEngine() const { return m_hepEngine.get(); }
    // Retrieve single random number
    double rndm() const override { return m_hepEngine->flat(); }

    StatusCode finalize() override {
      if (m_hepEngine) CLHEP::HepRandom::setTheEngine(nullptr);
      m_hepEngine.reset();
      return RndmEngine::finalize();
    }

  protected:
    void initEngine() { m_hepEngine = createEngine(); }
    virtual std::unique_ptr<CLHEP::HepRandomEngine> createEngine() = 0;
  };
}
#endif // HEPRNDM_HEPRNDMBASEENGINE_H