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Address some new Roslyn nullability warnings #35782
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Hmm. This
[NotNullIfNotNull("syncLock")]
on thesyncLock
parameter is basically saying "the method won't set this ref parameter to null". I wonder if we have other places where we should be adding such an attribute... to my knowledge these if the first time we've usedNotNullIfNotNull
to refer to the same parameter it's attributed on.There was a problem hiding this comment.
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For example, everywhere we have a
ref T foo
parameter, should we be annotating it as[NotNullIfNotNull("foo")]
(just in case T was nullable)? That'd be kind of awful. @jcouv, what's the recommended approach here?There was a problem hiding this comment.
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Along those lines,
Volatile.Read<T>(ref T value)
could be a candidate for an[In]
-like attribute. Basically: "The caller must explicitly use the ref keyword to pass an address to this routine (no implicit in conversion allowed), but the routine promises not to assign a new value to the provided address." That attribute would also imply[NotNullIfNotNull("sameParam")]
by construction.