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
};

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