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