// -*- C++ -*-
#ifndef RIVET_Cmp_FHH
#define RIVET_Cmp_FHH

namespace Rivet {


  // Forward-declare the Cmp template class
  template <typename T>
  class Cmp;


  /// Enumeration of possible value-comparison states
  enum class CmpState {
    UNDEF, EQ, NEQ
  };

  /// Representation of a CmpState as a string
  inline std::string toString(const CmpState& cmpst) {
    switch (cmpst) {
      case CmpState::UNDEF: return "Cmp: ??";
      case CmpState::EQ:    return "Cmp: ==";
      case CmpState::NEQ:   return "Cmp: !=";
    }
    throw Error("CmpState value not in enum list");
  }

  /// Stream a CmpState via its toString representation
  inline std::ostream& operator << (std::ostream& os, const CmpState& obj) {
    os << toString(obj);
    return os;
  }

}

#endif