ProxyAsParallelData.h

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#ifndef LARDATA_RECOBASEPROXY_PROXYBASE_PROXYASPARALLELDATA_H
#define LARDATA_RECOBASEPROXY_PROXYBASE_PROXYASPARALLELDATA_H

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

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

namespace proxy {

  namespace details {

    template <typename AuxProxyColl,
              typename Aux = util::collection_value_t<AuxProxyColl>,
              typename Tag = Aux>
    struct ProxyAsParallelData;

  } // namespace details

  // --- BEGIN Infrastructure for proxies as auxiliary data --------------------
  template <typename Tag /* = Aux */,
            typename Aux /* = util::collection_value_t<AuxProxyColl>*/,
            typename AuxProxyColl>
  auto makeProxyAsParallelData(AuxProxyColl&& auxProxy)
  {
    return details::ProxyAsParallelData<AuxProxyColl, Aux, Tag>(std::move(auxProxy));
  } // makeProxyAsParallelData()


  //----------------------------------------------------------------------------
  namespace details {

    //--------------------------------------------------------------------------
    template <typename AuxProxyColl,
              typename Aux /* = util::collection_value_t<AuxProxyColl> */,
              typename Tag /* = Aux */
              >
    struct ProxyAsParallelData : private AuxProxyColl, public ParallelData<AuxProxyColl, Aux, Tag> {
      ProxyAsParallelData(AuxProxyColl&& proxy)
        : AuxProxyColl(std::move(proxy))
        , ParallelData<AuxProxyColl, Aux, Tag>(static_cast<AuxProxyColl const*>(this))
      {}

      // explicitly select the tag from the parallel data (same as Tag)
      using typename ParallelData<AuxProxyColl, Aux, Tag>::tag;

    }; // class ProxyAsParallelData<>

    //--------------------------------------------------------------------------

  } // namespace details

} // namespace proxy

#endif // LARDATA_RECOBASEPROXY_PROXYBASE_PROXYASPARALLELDATA_H