What is IAlternateEqualityComparer? #104423
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I've started seeing this interface pop up in PRs but I'm not sure why it exists or what it is used for. |
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Replies: 1 comment 3 replies
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@TonyValenti Basically an interface in addition to IEqualityComparer that says "hey, you've got some data of type X there and I can compare it with data of type Y. With it you can look up values in string based Dictionaries using spans for example. I believe this was one of the main motivations for it. |
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Exactly. The built-in string comparers all implement |
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Ahh! So it is basically IEqualityComparer<TLeft, TRight> |
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Yes |
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@TonyValenti Basically an interface in addition to IEqualityComparer that says "hey, you've got some data of type X there and I can compare it with data of type Y.
With it you can look up values in string based Dictionaries using spans for example. I believe this was one of the main motivations for it.