Function pallet_tenancy::child::get_or_else

pub fn get_or_else<T, F>(
    child_info: &ChildInfo,
    key: &[u8],
    default_value: F
) -> Twhere
    T: Decode,
    F: FnOnce() -> T,

Return the value of the item in storage under key, or default_value() if there is no explicit entry.