/data/refman/pasoursint/CMSSW_5_3_10/src/FWCore/Framework/src/CPCSentry.h

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#ifndef FWCore_Framework_CPCSentry_h
#define FWCore_Framework_CPCSentry_h

// class CPCSentry uses RAII to make sure that the
// CurrentProcessingContext pointer it is guarding is set to the right
// value, and cleared at the right time.

namespace edm
{
  class CurrentProcessingContext;
  namespace detail
  {

    class CPCSentry
    {
    public:
      CPCSentry(CurrentProcessingContext const*& c,
                CurrentProcessingContext const* value) :
        referenced_(&c)
      {
        c = value;      
      }

      ~CPCSentry() { *referenced_ = 0; }

    private:
      CurrentProcessingContext const** referenced_;
    };
  }
}


#endif // FWCore_Framework_CPCSentry_h