AddOrUpdate< TKey, TValue >() [1/2]

static TValue System.Collections.Immutable.ImmutableInterlocked.AddOrUpdate< TKey, TValue > ( ref ImmutableDictionary< TKey, TValue > location, TKey key, Func< TKey, TValue > addValueFactory, Func< TKey, TValue, TValue > updateValueFactory )

inlinestatic

Type Constraints

TKey

:

notnull

Definition at line 151 of file ImmutableInterlocked.cs.

                                                                                                                                                                                                           : notnull
    {
        Requires.NotNull(addValueFactory, "addValueFactory");
        Requires.NotNull(updateValueFactory, "updateValueFactory");
        ImmutableDictionary<TKey, TValue> immutableDictionary = Volatile.Read(ref location);
        TValue val;
        bool flag;
        do
        {
            Requires.NotNull(immutableDictionary, "location");
            val = ((!immutableDictionary.TryGetValue(key, out var value)) ? addValueFactory(key) : updateValueFactory(key, value));
            ImmutableDictionary<TKey, TValue> immutableDictionary2 = immutableDictionary.SetItem(key, val);
            if (immutableDictionary == immutableDictionary2)
            {
                return value;
            }
            ImmutableDictionary<TKey, TValue> immutableDictionary3 = Interlocked.CompareExchange(ref location, immutableDictionary2, immutableDictionary);
            flag = immutableDictionary == immutableDictionary3;
            immutableDictionary = immutableDictionary3;
        }
        while (!flag);
        return val;
    }

References System.Threading.Interlocked.CompareExchange(), System.key, System.Threading.Volatile.Read(), System.Collections.Generic.Dictionary< TKey, TValue >.TryGetValue(), and System.value.