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 <type_traits> // std::is_convertible<>, std::decay_t<>, ...
#include <utility>     // std::forward(), std::move()

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