Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

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If equality is not needed for the derived class you hayat skip IEquatable but you need to override the CanEqual to prevent it being equal with base classes (unless of course they should be considered equal).

= to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading.

Are the bonuses for infernal war machine weapon stations static, or are they affected by their user?

Bey far kakım I see this is only exposed through the StructuralComparisons class. The only way I güç figure out to make this useful is to make a StructuralEqualityComparer helper class kakım follow:

Although I think the gains from hamiş boxing will be less than the cost for having CanEqual. In that case you should seal your types and you no longer need CanEqual. Sealing also saf some performance benefits.

The generic tuple classes (Tuple, Tuple, Tuple, and so on) and the Array class provide explicit implementations of the IStructuralEquatable interface. By casting (in C#) or converting (in Visual Basic) the current instance of an array or tuple to an IStructuralEquatable interface value and providing your IEqualityComparer implementation bey an argument to the Equals method, you güç define a custom equality comparison for the array or collection.

So, I am apparently wrong bey unequal objects may have equal hash codes. But isn't GetHashCode returning a somewhat randomly distributed set of values a requirement?

Consider that there are only ~4.2 billion different hashcodes. Sevimli you create more than this many different objects of the type on which GetHashCode is called? In this case it is easy to see the answer is "yes". So GetHashCode is a sort of compressing projection onto a smaller kaş - there are bound to be duplicates.

Reading through the excellent blog post by Sergey on struct equality performance he mentions that the default implementations are pretty slow and using boxing C# IStructuralEquatable nedir for each member. Additionally, he mentions that a memory comparison may not give you the correct results in this super simple example:

In addition to this awesome blog Frank and I also dicussed all of this awesome in detail on Merge Conflict on episode 111:

Safi on a certain platform, I'm compelled to issue the standard warning not to rely on the values of hashcodes or how they are computed, since it is derece guaranteed to be the same across updates or platforms.

Oldu, makalede eksiklikler olabilir. Bunu tenkit olarak ikrar ediyorum. Fonksiyonel programlamada struct kullanılmasının nedenini bile bilmiyor, performans ve başka mevzular için da rastgele bir rey barındırmıyorum. Siz biliyorsanız lütfen aydınlatır mkaloriız?

GetHashCode does derece return unique values for instances that are not equal. However, instances that are equal will always return the same hash code.

Bunun taçı gün, IStructuralComparable arayüzü, programınızı henüz modüler hale getirir ve harf tekrarını azaltır. Farklı veri dokumaları ortada strüktürel huzurlaştırma mesleklemlerini uslu bir yerde yönetebilir ve kodunuzun hizmetını kolaylaştırabilirsiniz.