ESGetToken.h

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#ifndef FWCore_Utilities_ESGetToken_h
#define FWCore_Utilities_ESGetToken_h
// -*- C++ -*-
//
// Package:     FWCore/Utilities
// Class  :     ESGetToken
//
#include "FWCore/Utilities/interface/ESInputTag.h"

namespace edm {
  class EDConsumerBase;
  class ESProducer;
  class ESConsumesCollector;
  class EventSetup;
  namespace eventsetup {
    class EventSetupRecord;
  }

  // A ESGetToken is created by calls to 'esConsumes' from an EDM
  // module.
  template<typename ESProduct>
  class ESGetTokenT {
    friend class EDConsumerBase;
    friend class ESProducer;
    friend class ESConsumesCollector;
    friend class EventSetup;
    friend class eventsetup::EventSetupRecord;

  public:
    ESGetTokenT() = default;

  private:
    explicit ESGetTokenT(ESInputTag const& tag) : m_tag{tag} {}

    ESInputTag m_tag{};
  };

}

#endif