Method sort

dynet/sig.h:172–176

    sigs.clear(); whiches.clear(); sorted=false;
  }
  void sort() {
    if (sorted) { return; }
    std::sort(sigs.begin(), sigs.end(), [](std::pair<Sig, int> s1, std::pair<Sig, int> s2) {return s1.first < s2.first;});
    sorted=true;
  }
  int sig2type(int sig) { return whiches[sig]; }
  int size() { return sigs.size(); }
  std::vector<std::pair<Sig,int> > sigs;