Function FindPointeeOrNull

be/src/gutil/map-util.h:264–272

// or null if it doesn't.
template <class Collection>
typename Collection::mapped_type::element_type*
FindPointeeOrNull(const Collection& collection,  // NOLINT,
                  const typename Collection::key_type& key) {
  auto it = collection.find(key);
  if (it == collection.end()) {
    return nullptr;
  }
  return it->second.get();
}

// Finds the value associated with the given key and copies it to *value (if not
// NULL). Returns false if the key was not found, true otherwise.