Method Incref

extern/re2/re2/regexp.cc:90–113

Increments reference count, returns object as convenience.

// Increments reference count, returns object as convenience.
Regexp* Regexp::Incref() {
  if (ref_ >= kMaxRef-1) {
    static std::once_flag ref_once;
    std::call_once(ref_once, []() {
      ref_mutex = new Mutex;
      ref_map = new std::map<Regexp*, int>;
    });

    // Store ref count in overflow map.
    MutexLock l(ref_mutex);
    if (ref_ == kMaxRef) {
      // already overflowed
      (*ref_map)[this]++;
    } else {
      // overflowing now
      (*ref_map)[this] = kMaxRef;
      ref_ = kMaxRef;
    }
    return this;
  }

  ref_++;
  return this;
}

// Decrements reference count and deletes this object if count reaches 0.
void Regexp::Decref() {