ESConsumesCollector.h

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#ifndef FWCore_Framework_ESConsumesCollector_h
#define FWCore_Framework_ESConsumesCollector_h
// -*- C++ -*-
//
// Package:     FWCore/Framework
// Class  :     edm::ConsumesCollector
//
//
// Original Author:  Kyle Knoepfel
//         Created:  Fri, 02 Oct 2018 12:44:47 GMT
//

#include "FWCore/Framework/interface/EventSetupRecordKey.h"
#include "FWCore/Utilities/interface/ESGetToken.h"
#include "FWCore/Utilities/interface/ESInputTag.h"
#include "FWCore/Utilities/interface/propagate_const.h"
#include "FWCore/Utilities/interface/Transition.h"

namespace edm {
  class ESConsumesCollector {
  public:

    ESConsumesCollector() = delete;
    ESConsumesCollector(ESConsumesCollector const&) = default;
    ESConsumesCollector(ESConsumesCollector&&) = default;
    ESConsumesCollector& operator=(ESConsumesCollector const&) = default;
    ESConsumesCollector& operator=(ESConsumesCollector&&) = default;

    // ---------- member functions ---------------------------
    template <typename Product>
    auto consumes(ESInputTag const& tag) {
      return ESGetTokenT<Product>{tag};
    }

    template <typename Product, typename Record>
    auto consumes(ESInputTag const& tag) {
      return ESGetTokenT<Product>{tag};
    }

    template <typename Product>
    auto consumes(eventsetup::EventSetupRecordKey const&, ESInputTag const& tag) {
      return ESGetTokenT<Product>{tag};
    }

  private:
    //only ESProducer is allowed to make an instance of this class
    friend class ESProducer;

    explicit ESConsumesCollector(ESProducer* const iConsumer) :
      m_consumer{iConsumer}
    {}

    // ---------- member data --------------------------------
    edm::propagate_const<ESProducer*> m_consumer{nullptr};
  };
}


#endif