ParentContext.h

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#ifndef FWCore_ServiceRegistry_ParentContext_h
#define FWCore_ServiceRegistry_ParentContext_h
 
//
// Original Author: W. David Dagenhart
//         Created: 7/11/2013
 
#include <iosfwd>
 
namespace edm {
 
  class GlobalContext;
  class InternalContext;
  class ModuleCallingContext;
  class PlaceInPathContext;
  class StreamContext;
 
  class ParentContext {
  public:
    enum class Type { kGlobal, kInternal, kModule, kPlaceInPath, kStream, kInvalid };
 
    ParentContext();
    ParentContext(GlobalContext const*);
    ParentContext(InternalContext const*);
    ParentContext(ModuleCallingContext const*);
    ParentContext(PlaceInPathContext const*);
    ParentContext(StreamContext const*);
 
    Type type() const { return type_; }
 
    bool isAtEndTransition() const;
 
    GlobalContext const* globalContext() const;
    InternalContext const* internalContext() const;
    ModuleCallingContext const* moduleCallingContext() const;
    PlaceInPathContext const* placeInPathContext() const;
    StreamContext const* streamContext() const;
 
  private:
    Type type_;
 
    union Parent {
      GlobalContext const* global;
      InternalContext const* internal;
      ModuleCallingContext const* module;
      PlaceInPathContext const* placeInPath;
      StreamContext const* stream;
    } parent_;
  };
 
  std::ostream& operator<<(std::ostream&, ParentContext const&);
}  // namespace edm
#endif