public static bool IsEqualTo <T>(this IReadOnlyList <T>?source1, IReadOnlyList <T>?source2, IEqualityComparer <T>?comparer = null)
{
if ((source1 == null) != (source2 == null))
{
return(false);
}
if (source1 == null)
{
return(true);
}
if (source1 is T[] array1 && source2 is T[] array2)
{
return(array1.IsEqualTo(array2, comparer));
}
if (source1.Count != source2 !.Count)
{
return(false);
}
var count = source1.Count;
comparer = comparer.OrDefault();
for (int i = 0; i < count; i++)
{
if (!comparer.Equals(source1[i], source2[i]))
{
return(false);
}
}
return(true);
}
public static int GetCollectionHashCode <T>(this IReadOnlyCollection <T>?source, IEqualityComparer <T>?comparer = null)
{
if (source == null)
{
return(382720733); // Null hash code. I picked a large prime number
}
if (source is IReadOnlyList <T> array)
{
return(array.GetCollectionHashCode(comparer));
}
return(ComputeEnumerableHashCode(source, comparer.OrDefault()));
}
public Property(T?initialValue, Func <T?, T?, T?>?coerceValue = null, IEqualityComparer <T>?comparer = null)
{
this.Value = initialValue;
this.coerceValue = coerceValue;
stream = new BehaviorSubject <T>(CoerceValue(initialValue) !);
ValueChanged = stream
.DistinctUntilChanged(comparer.OrDefault())
.Select(_ => Unit.Default);
disposables.Add(stream.Subscribe(value => Value = value));
disposables.Add(new Disposable(() => stream.OnCompleted()));
}
public static bool IsEqualTo <T>(this IReadOnlyCollection <T>?source1, IReadOnlyCollection <T>?source2, IEqualityComparer <T>?comparer = null)
{
if ((source1 == null) != (source2 == null))
{
return(false);
}
if (source1 == null)
{
return(true);
}
if (source1 is IReadOnlyList <T> list1 && source2 is IReadOnlyList <T> list2)
{
return(list1.IsEqualTo(list2, comparer));
}
if (source1.Count != source2 !.Count)
{
return(false);
}
return(AreEqualEnumerables(source1, source2, comparer.OrDefault()));
}
public PropertyEqualityComparer(Func <T, P> getProperty, IEqualityComparer <P>?propertyComparer = null)
{
this.getProperty = getProperty ?? throw new ArgumentNullException(nameof(getProperty));
this.propertyComparer = propertyComparer.OrDefault();
}
public static Dictionary <TKey, TValue> ToDictionary <TKey, TValue>(
this IEnumerable <ValueTuple <TKey, TValue> > source,
IEqualityComparer <TKey>?comparer = null)
where TKey : notnull =>
source.ToDictionary(t => t.Item1, t => t.Item2, comparer.OrDefault());
public static Dictionary <TKey, TValue> ToDictionary <TKey, TValue>(
this IEnumerable <KeyValuePair <TKey, TValue> > source,
IEqualityComparer <TKey>?comparer = null)
where TKey : notnull =>
new Dictionary <TKey, TValue>(source, comparer.OrDefault());
