tablehelpers.h

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#ifndef FWCore_SOA_tablehelpers_h
#define FWCore_SOA_tablehelpers_h
// -*- C++ -*-
//
// Package:     FWCore/SOA
//
//
// Original Author:  Chris Jones
//         Created:  Thu, 24 Aug 2017 16:18:18 GMT
//

// system include files
#include <type_traits>
#include <tuple>

// user include files

// forward declarations

namespace edm {
  namespace soa {
    namespace impl {

      template <int I>
      struct FoundIndex {
        static constexpr int index = I;
      };

      template <int I, typename T, typename TPL>
      struct GetIndex {
        static constexpr int index = std::conditional<std::is_same<T, typename std::tuple_element<I, TPL>::type>::value,
                                                      FoundIndex<I>,
                                                      GetIndex<I + 1, T, TPL>>::type::index;
      };

    }  // namespace impl
  }    // namespace soa
}  // namespace edm

#endif