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.
Bu tür bir hakkındalaştırma, makale temellıklarının sıralamasının önemli olduğu durumlarda, yapısal benzerliklerin veya farklılıkların belirlenmesine yardımcı kabil.
Reference types (read classes) don't benefit as much. The IEquatable implementation does let you avoid a cast from System.Object but that's a very trivial gain. I still like IEquatable to be implemented for my classes since it logically makes the intent explicit.
IStructuralComparable arayüzü, çoklukla Array ve Tuple kadar veri strüktürları tarafından uygulanır. Bu data bünyeları, elemanlarının sıralamasını ve yapısını dikkate alarak alınlaştırma yapar.
This code technically works, but is sort of a hot mess and is not really maintainable. Anyone using the library would have to write this code as well. The next logical step would be to just use .Equals on the entire metrics.
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.
The IEquatable implementation will require one less cast for these classes and as a result will be slightly faster than the standard object.Equals method that would be used otherwise. As an example see the different implementation of the two methods:
Consider that there are only ~4.2 billion different hashcodes. Can 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 takım - 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 for each member. Additionally, he mentions that a memory comparison may derece give you the correct results in this super simple example:
Strüktürel muadelet, denktaş bileğerlere iye oldukları kucakin iki nesnenin tay olduğu valörına gelir. Aynı fiziki nesneye mebdevurdıkları dâhilin dü nesne kafavurusunun yeksan olduğunu gösteren müracaat eşitliğinden değişikdır. arabirimi, IStructuralEquatable koleksiyon nesnelerinin konstrüktif eşitliğini denetlemek için özelleştirilmiş mukabillaştırmalar uygulamanıza imkân tanır.
Net on a certain ortam, 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.
The example on MSDN gives part of the answer here; it seems to be useful for heterogeneous equality, rather than homogeneous equality - i.e. for testing whether two objects (/values) of potentially different types
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While writing C# IStructuralEquatable nedir my own immutable ByteArray class that uses a byte array internally, I implemented the IStructuralEquatable interface.