JParametersHelper.hh

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#ifndef __JTRIGGER__JPARAMETERSHELPER__
#define __JTRIGGER__JPARAMETERSHELPER__

/**
 * \author mdejong
 */

namespace JTRIGGER {}
namespace JPP { using namespace JTRIGGER; }

namespace JTRIGGER {

  /**
   * Wrapper class to share parameters.
   *
   * The static method JParametersHelper::getParameters can be used to obtain the latest parameter values.
   */
  template<class JParameters_t>
  struct JParametersHelper :
    public JParameters_t
  {
    /**
     * Default constructor.
     */
    JParametersHelper() :
      JParameters_t()
    {
      get() = static_cast<const JParameters_t*>(this);
    }


    /**
     * Copy constructor.
     *
     * \param  parameters     parameters
     */
    JParametersHelper(const JParameters_t& parameters) :
      JParameters_t(parameters)
    {
      get() = static_cast<const JParameters_t*>(this);
    }


    /**
     * Get latest parameters.
     *
     * \return                parameters
     */
    static const JParameters_t& getParameters()
    {
      return *get();
    }

  private:
    /**
     * Get pointer to latest parameters.
     *
     * \return                pointer to latest parameters
     */
    static const JParameters_t*& get()
    {
      static const JParameters_t* parameters;

      return parameters;
    }
  };
}

#endif