MainCollectionProxy.h

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#ifndef LARDATA_RECOBASEPROXY_PROXYBASE_MAINCOLLECTIONPROXY_H
#define LARDATA_RECOBASEPROXY_PROXYBASE_MAINCOLLECTIONPROXY_H

// LArSoft libraries
#include "larcorealg/CoreUtils/ContainerMeta.h" // util::collection_value_t, ...

// C/C++ standard
#include <cstdlib> // std::size_t

namespace proxy {

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

    //--------------------------------------------------------------------------
    //--- stuff for the main collection
    //--------------------------------------------------------------------------
    template <typename MainColl>
    struct MainCollectionProxy {

      using main_collection_t = MainColl;

      using main_element_t = util::collection_value_t<MainColl>;

      MainCollectionProxy(main_collection_t const& main) : fMain(&main) {}

      main_collection_t const& main() const { return mainRef(); }

      main_collection_t const& mainRef() const { return *fMain; }

      main_collection_t const* mainPtr() const { return fMain; }

    protected:
      using this_t = MainCollectionProxy<main_collection_t>;

      this_t& mainProxy() { return *this; }

      this_t const& mainProxy() const { return *this; }

      auto getMainAt(std::size_t i) const -> decltype(auto) { return fMain->operator[](i); }

    private:
      main_collection_t const* fMain; 

    }; // struct MainCollectionProxy<>

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

  } // namespace details

} // namespace proxy

#endif // LARDATA_RECOBASEPROXY_PROXYBASE_MAINCOLLECTIONPROXY_H