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modify

reifydb_flow::operator::state_access

Function modify 

Source 
pub fn modify<K, V, R>(
    store: &mut dyn StateStore,
    key: &K,
    f: impl FnOnce(&mut V) -> R,
) -> Result<R>
where
    K: Hash + Eq + Clone + HeapSize,
    for<'a> &'a K: IntoGroupStateKey,
    V: Clone + Default + OperatorState + HeapSize,