ProxyAsParallelData.h

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#ifndef LARDATA_RECOBASEPROXY_PROXYBASE_PROXYASPARALLELDATA_H
#define LARDATA_RECOBASEPROXY_PROXYBASE_PROXYASPARALLELDATA_H


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

// 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