Column.h

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#ifndef FWCore_SOA_Column_h
#define FWCore_SOA_Column_h
// -*- C++ -*-
//
// Package:     FWCore/SOA
// Class  :     Column
//
//
// Original Author:  Chris Jones
//         Created:  Thu, 24 Aug 2017 16:17:56 GMT
//

// system include files

// user include files

// forward declarations
namespace edm {
  namespace soa {

    template <typename COL, typename F>
    struct ColumnFillerHolder {
      using Column_type = COL;
      F m_f;
    };

    template <typename T, typename INHERIT>
    struct Column {
      using type = T;

      static constexpr const char* const& label() { return INHERIT::kLabel; }

      template <typename F>
      static ColumnFillerHolder<INHERIT, F> filler(F&& iF) {
        return {iF};
      }

    private:
      Column() = default;
      Column(const Column&) = delete;  // stop default

      const Column& operator=(const Column&) = delete;  // stop default
    };

  }  // namespace soa
}  // namespace edm
#define SOA_DECLARE_COLUMN(_ClassName_, _Type_, _String_)             \
  struct _ClassName_ : public edm::soa::Column<_Type_, _ClassName_> { \
    static constexpr const char* const kLabel = _String_;             \
  }
#endif