C++ unordered_set::clear方法代码示例

    inline void ObservableSettings::enableUpdates() {
    	updatesEnabled_  = true;
    	updatesDeferred_ = false;

    	// if there are outstanding deferred updates, do the notification
        if (deferredObservers_.size() > 0)
        {
            bool successful = true;
            std::string errMsg;

            QL_TRACE("deferred notification of " << deferredObservers_.size() << " observers");
            for (iterator i=deferredObservers_.begin(); i!=deferredObservers_.end(); ++i) {
                try {
                    (*i)->update();
                } catch (std::exception& e) {
                    successful = false;
                    errMsg = e.what();
                } catch (...) {
                    successful = false;
                }
            }

            deferredObservers_.clear();

            QL_ENSURE(successful,
                  "could not notify one or more observers: " << errMsg);
        }
    }

void load(Archive & ar, boost::unordered_set<T> & t, unsigned int version)
{
    // clear the set
    t.clear();
    // read the size
    typedef typename boost::unordered_set<T>::size_type size_type;
    size_type size;
    ar & BOOST_SERIALIZATION_NVP(size);
    for (size_type i = 0; i < size; i++) {
        // read a pair
        T item;
        ar & boost::serialization::make_nvp("item"+i, item);
        // insert it into the set
        t.insert(item);
    }
}

bool HyperTreeLoader::Load(AllOptions const& opts,
                           const std::vector<FactorType> &input,
                           const std::vector<FactorType> &output,
                           const std::string &inFile,
                           const RuleTableFF &ff,
                           HyperTree &trie,
                           boost::unordered_set<std::size_t> &sourceTermSet)
{
  PrintUserTime(std::string("Start loading HyperTree"));

  sourceTermSet.clear();

  std::size_t count = 0;

  std::ostream *progress = NULL;
  IFVERBOSE(1) progress = &std::cerr;
  util::FilePiece in(inFile.c_str(), progress);

  // reused variables
  std::vector<float> scoreVector;
  StringPiece line;

  double_conversion::StringToDoubleConverter converter(double_conversion::StringToDoubleConverter::NO_FLAGS, NAN, NAN, "inf", "nan");

  HyperPathLoader hyperPathLoader;

  Phrase dummySourcePhrase;
  {
    Word *lhs = NULL;
    dummySourcePhrase.CreateFromString(Input, input, "hello", &lhs);
    delete lhs;
  }

  while(true) {
    try {
      line = in.ReadLine();
    } catch (const util::EndOfFileException &e) {
      break;
    }

    util::TokenIter<util::MultiCharacter> pipes(line, "|||");
    StringPiece sourceString(*pipes);
    StringPiece targetString(*++pipes);
    StringPiece scoreString(*++pipes);

    StringPiece alignString;
    if (++pipes) {
      StringPiece temp(*pipes);
      alignString = temp;
    }

    ++pipes;  // counts

    scoreVector.clear();
    for (util::TokenIter<util::AnyCharacter, true> s(scoreString, " \t"); s; ++s) {
      int processed;
      float score = converter.StringToFloat(s->data(), s->length(), &processed);
      UTIL_THROW_IF2(std::isnan(score), "Bad score " << *s << " on line " << count);
      scoreVector.push_back(FloorScore(TransformScore(score)));
    }
    const std::size_t numScoreComponents = ff.GetNumScoreComponents();
    if (scoreVector.size() != numScoreComponents) {
      UTIL_THROW2("Size of scoreVector != number (" << scoreVector.size() << "!="
                  << numScoreComponents << ") of score components on line " << count);
    }

    // Source-side
    HyperPath sourceFragment;
    hyperPathLoader.Load(sourceString, sourceFragment);
    ExtractSourceTerminalSetFromHyperPath(sourceFragment, sourceTermSet);

    // Target-side
    TargetPhrase *targetPhrase = new TargetPhrase(&ff);
    Word *targetLHS = NULL;
    targetPhrase->CreateFromString(Output, output, targetString, &targetLHS);
    targetPhrase->SetTargetLHS(targetLHS);
    targetPhrase->SetAlignmentInfo(alignString);

    if (++pipes) {
      StringPiece sparseString(*pipes);
      targetPhrase->SetSparseScore(&ff, sparseString);
    }

    if (++pipes) {
      StringPiece propertiesString(*pipes);
      targetPhrase->SetProperties(propertiesString);
    }

    targetPhrase->GetScoreBreakdown().Assign(&ff, scoreVector);
    targetPhrase->EvaluateInIsolation(dummySourcePhrase,
                                      ff.GetFeaturesToApply());

    // Add rule to trie.
    TargetPhraseCollection::shared_ptr phraseColl
    = GetOrCreateTargetPhraseCollection(trie, sourceFragment);
    phraseColl->Add(targetPhrase);

    count++;
  }

//.........这里部分代码省略.........

 inline void Observer::unregisterWithAll() {
     for (iterator i=observables_.begin(); i!=observables_.end(); ++i)
         (*i)->unregisterObserver(this);
     observables_.clear();
 }

 static void exec(ArcType& a, boost::unordered_set<T>& vec){
   vec.clear();
   deserialize_iterator<ArcType, T>(a, std::inserter(vec,vec.end()));
 }