Avoid unnecessary lazy init in StructuralComparisons #101344
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This was referenced Apr 21, 2024
danmoseley
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jkotas
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- Some code out there may get broken by
StructuralComparisons.StructuralComparerimplementingIEqualityComparerorStructuralComparisons.StructuralEqualityComparerimplementingIComparer. - IL trimmer may end up keeping unusued interface implementation around now that both interfaces are implemented by the same type.
Structural equality is used very rarely, so it is unlikely for these concerns to be a problem in practice. I am mentioning them out of abundance of caution. An alternative would be to keep the two types and add static readonly field in each of the types to get the lazy initialization for free.
I'll switch to that |
Move the fields to the target types and make them readonly instead of manually lazy.
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This was referenced Apr 21, 2024
jkotas
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* Avoid unnecessary lazy init in StructuralComparisons Move the fields to the target types and make them readonly instead of manually lazy. * Update StructuralComparisons.cs
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The only benefit of having these be lazy in this manner is avoiding one of the two objects being constructed. We can instead just combine them into a singleton that's initialized in a static readonly.
Best reviewed without whitespace diff: https://github.com/dotnet/runtime/pull/101344/files?w=1