ProxyAsAuxProxyMaker.h

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#ifndef LARDATA_RECOBASEPROXY_PROXYBASE_PROXYASAUXPROXYMAKER_H
#define LARDATA_RECOBASEPROXY_PROXYBASE_PROXYASAUXPROXYMAKER_H

// LArSoft libraries
#include "larcorealg/CoreUtils/ContainerMeta.h" // util::collection_value_t, ...
#include "lardata/RecoBaseProxy/ProxyBase/ProxyAsParallelData.h"
#include "lardata/RecoBaseProxy/ProxyBase/getCollection.h"

// framework libraries
#include "canvas/Utilities/InputTag.h"

// C/C++ standard
#include <utility> // std::forward(), std::move()

namespace proxy {


  template <typename Main, typename AuxProxy, typename AuxTag = AuxProxy>
  struct ProxyAsAuxProxyMakerBase {

    using data_tag = AuxTag;

    using main_element_t = Main;

    using aux_proxy_t = AuxProxy;

    template <typename Event, typename Handle, typename MainArgs, typename... AuxArgs>
    static auto make(Event const& event,
                     Handle&&,
                     MainArgs const&,
                     art::InputTag const& auxProxyTag,
                     AuxArgs&&... args)
    {
      auto auxProxy = makeAuxiliaryProxy(event, auxProxyTag, std::forward<AuxArgs>(args)...);
      return makeProxyAsParallelData<data_tag, util::collection_value_t<decltype(auxProxy)>>(
        std::move(auxProxy));
    }

  private:
    template <typename Event, typename... AuxArgs>
    static auto makeAuxiliaryProxy(Event const& event,
                                   art::InputTag const& auxProxyTag,
                                   AuxArgs&&... args)
    {
      return getCollection<aux_proxy_t>(event, auxProxyTag, std::forward<AuxArgs>(args)...);
    }

  }; // struct ProxyAsAuxProxyMakerBase<>

  //--------------------------------------------------------------------------
  template <typename Main,
            typename AuxProxy,
            typename CollProxy,
            typename Tag = util::collection_value_t<AuxProxy>>
  class ProxyAsAuxProxyMaker : public ProxyAsAuxProxyMakerBase<Main, AuxProxy, Tag> {};


} // namespace proxy

#endif // LARDATA_RECOBASEPROXY_PROXYBASE_PROXYASAUXPROXYMAKER_H