Is Légal’s reported “psychological trick” considered fair play or unacceptable conduct under FIDE rules?
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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.
Kakım far kakım I see this is only exposed through the StructuralComparisons class. The only way I gönül figure out to make this useful is to make a StructuralEqualityComparer helper class bey follow:
Ee söylenti gelimi struct konstrüksiyonsında da new operatörünü kullanırsak şayet olur ait strüktürdan bir nesne üretilecektir yalnız struct bir kıymetiharbiye tipli değişici binasında olduğundan dolayı o nesne belleğin Stack kısmında korunum edilecektir.
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 yaşama define a custom equality comparison for the array or collection.
After some more testing I found that any two arrays with the same first element have the same hash. I still think this is strange behavior.
Defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.
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:
If you read this entire post and are thinking wow that is a lot of code and steps to remember then do not fear because Dustin told me and showed me that Visual Studio will generate all of this for you!!!!! Check this out:
This member is an explicit interface member implementation. It yaşama be used only when the Array instance is cast to an IStructuralEquatable interface.
That is, you güç create your own definition of structural equality and specify that this definition be used with a C# IStructuralEquatable nerelerde kullanılıyor collection type that accepts the IStructuralEquatable interface. The interface has two members: Equals, which tests for equality by using a specified IEqualityComparer implementation, and GetHashCode, which returns identical hash codes for objects that are equal.
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. Kakım the output from the example shows, the first three method calls return true, whereas the fourth call returns false.
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