RootVarsAdapter.h

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#ifndef PhysicsTools_Utilities_RootVarsAdapter_h
#define PhysicsTools_Utilities_RootVarsAdapter_h

namespace root {
  namespace helper {

    template <typename F, unsigned int args>
    struct RootVarsAdapter {};

    template <typename F>
    struct RootVarsAdapter<F, 1> {
      static double value(F& f, const double* var) { return f(var[0]); }
    };

    template <typename F>
    struct RootVarsAdapter<F, 2> {
      static double value(F& f, const double* var) { return f(var[0], var[1]); }
    };
  }  // namespace helper
}  // namespace root

#endif