Function InsertIfNotPresent

tensorflow/core/lib/gtl/map_util.h:127–130

// key-value pair was inserted; returns false if the key was already present.
template <class Collection>
bool InsertIfNotPresent(Collection* const collection,
                        const typename Collection::value_type& vt) {
  return collection->insert(vt).second;
}

// Same as above except the key and value are passed separately.
template <class Collection>