Constant gnunet_sys::GNUNET_CONTAINER_MultiHashMapOption_GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY

pub const GNUNET_CONTAINER_MultiHashMapOption_GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY: GNUNET_CONTAINER_MultiHashMapOption = 2;

@ingroup hashmap There must only be one value per key; storing a value should fail if a value under the same key already exists.