withCollectionProxy.h

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#ifndef LARDATA_RECOBASEPROXY_PROXYBASE_WITHCOLLECTIONPROXY_H
#define LARDATA_RECOBASEPROXY_PROXYBASE_WITHCOLLECTIONPROXY_H

// LArSoft libraries
#include "lardata/RecoBaseProxy/ProxyBase/WithProxyAsAuxStructBase.h"

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

// C/C++ standard 
#include <tuple> // also std::tuple_element_t<>
#include <utility> // std::forward(), std::move()
#include <type_traits> // std::is_convertible<>, std::decay_t<>, ...


namespace proxy {
  
  // --- BEGIN Collection proxy infrastructure ---------------------------------
  
  //----------------------------------------------------------------------------
  template <typename AuxProxy, typename AuxTag, typename... Args>
  auto withCollectionProxyAs(Args&&... args)
    {
      using ArgTuple_t = std::tuple<Args&&...>;
      static_assert(
        std::is_convertible
          <std::decay_t<std::tuple_element_t<0U, ArgTuple_t>>, art::InputTag>(),
        "The first argument of withCollectionProxyAs() must be art::InputTag."
        );
      ArgTuple_t argsTuple(std::forward<Args>(args)...);
      return details::WithProxyAsAuxStructBase<AuxProxy, ArgTuple_t, AuxTag>
        (std::move(argsTuple));
    } // withCollectionProxyAs()
  
  //----------------------------------------------------------------------------
  template <typename AuxProxy, typename... Args>
  auto withCollectionProxy(Args&&... args)
    {
      return
        withCollectionProxyAs<AuxProxy, AuxProxy>(std::forward<Args>(args)...);
    }
  
  
  // --- END Collection proxy infrastructure -----------------------------------
  
} // namespace proxy


#endif // LARDATA_RECOBASEPROXY_PROXYBASE_WITHCOLLECTIONPROXY_H