DataProxyTemplate.h

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#ifndef FWCore_Framework_DataProxyTemplate_h
#define FWCore_Framework_DataProxyTemplate_h
// -*- C++ -*-
//
// Package:     Framework
// Class  :     DataProxyTemplate
//
//
// Author:      Chris Jones
// Created:     Thu Mar 31 12:45:32 EST 2005
//
 
// system include files
 
// user include files
#include "FWCore/Framework/interface/DataProxy.h"
#include "FWCore/Framework/interface/EventSetupRecord.h"
#include <cassert>
#include <limits>
 
// forward declarations
 
namespace edm {
 
  class EventSetupImpl;
 
  namespace eventsetup {
 
    template <class RecordT, class DataT>
    class DataProxyTemplate : public DataProxy {
    public:
      typedef DataT value_type;
      typedef RecordT record_type;
 
      DataProxyTemplate() {}
 
      const void* getImpl(const EventSetupRecordImpl& iRecord,
                          const DataKey& iKey,
                          EventSetupImpl const* iEventSetupImpl) override {
        assert(iRecord.key() == RecordT::keyForClass());
        RecordT rec;
        rec.setImpl(&iRecord, std::numeric_limits<unsigned int>::max(), nullptr, iEventSetupImpl, true);
        return this->make(rec, iKey);
      }
 
    protected:
      virtual const DataT* make(const RecordT&, const DataKey&) = 0;
    };
 
  }  // namespace eventsetup
}  // namespace edm
#endif