/Users/mdipierro/fermiqcd/development/Libraries/fermiqcd_coefficients.h

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class coefficients : public map<string,mdp_real> {
 public:
  bool has_key(const string s) const {
    if(this->find(s)==this->end()) return false;
    return true;
  }
  /* for some reason the const declaration does not do anything. removing
  const mdp_real &operator[] (const string s) const {
    cout << "HERE\n";
    if(!has_key(s)) {
      mdp << "coefficient " << s << " is undefined but required" << endl;
      exit(1);
    }
    return static_cast<map<string,mdp_real> >(*this)[s];
  }
  mdp_real &operator[] (const string s) {
    cout << "THERE\n";
    return static_cast<map<string,mdp_real> * >(this)->operator[](s);
  }
  */
};

void dagger(coefficients &coeff) {
  if(!coeff.has_key("sign")) coeff["sign"]=-1;
  else coeff["sign"]=-coeff["sign"];
}

ostream& operator<< (ostream& os, const coefficients& coeff ) {
  begin_function("print_coefficients");
  coefficients::const_iterator iter;
  for (iter=coeff.begin(); iter != coeff.end(); iter++) {
    cout << "<coefficient name=\"" << iter->first << "\">" << iter->second 
         << "</coefficient>" << '\n';
  }
  end_function("print_coefficients");
  return os;
}

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