Method Unref

src/leveldb/db/version_set.cc:456–463

void Version::Ref() { ++refs_; }

void Version::Unref() {
  assert(this != &vset_->dummy_versions_);
  assert(refs_ >= 1);
  --refs_;
  if (refs_ == 0) {
    delete this;
  }
}

bool Version::OverlapInLevel(int level, const Slice* smallest_user_key,
                             const Slice* largest_user_key) {