helicity.hh

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#pragma once
 
namespace HEJ {
  namespace helicity {
    enum Helicity {
      minus, plus
    };
  }
  using helicity::Helicity;
 
  inline
  constexpr Helicity flip(Helicity h) {
    return (h == helicity::plus)?helicity::minus:helicity::plus;
  }
} // namespace HEJ