The individual calls to IEqualityComparer.Equals end and the IStructuralEquatable.Equals method returns a value either when a method call returns false or after all array elements or tuple components have been compared.
In certain scenarios (such as using the value type birli a key in a dictionary) it kişi murder performance in one foul swoop.
It differs from reference equality, which indicates that two object references are equal because they reference the same physical object.
Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. Bey the output from the example shows, the first three method calls return true, whereas the fourth call returns false.
In this equating the values in arrays may be same or different but their object references are equal.
I never put much thought into using a struct over a class or even additional optimizations because to me the struct was optimized already. When I was working on fixing a bug in our DeviceDisplay to hamiş trigger new events unless a value changed a whole new world opened up to me.
What does IEquatable buy you, exactly? The only reason I dirilik see it being useful is when creating a generic type and forcing users to implement and write a good equals method.
The following example creates two identical 3-tuple objects whose components consist of three Double values. The value of the second component is Double.NaN. The example then calls the Tuple.Equals method, and it calls the IStructuralEquatable.Equals method three times. The first time, it passes the default equality comparer that is returned by the EqualityComparer.
The first issue we see here is that this struct is mutable in that you kişi actually change C# IStructuralEquatable Kullanımı the data later on via the set properties. There was no real reason that we introduced this except that we were used to it.
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C# IStructuralComparable Determines whether the current collection object precedes, occurs in the same position kakım, or follows another object in the sort order.
Beli, makalede nekais olur. Bunu tenkit olarak ikrar ediyorum. Işlevsel programlamada struct kullanılmasının nedenini bile bilmiyor, performans ve sair mevzular üzerine da rastgele bir fikir barındırmıversiyon. Siz biliyorsanız lütfen aydınlatır mısınız?
You observations does not conflict with the documentation and there is no bug in the implementation.
Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are not mutually exclusive.