counter: use NonNull #1078
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counter: use NonNull #1078
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counter::{Sender, Receiver} hold shared references to a channel,
similar to an Arc. Their raw pointers to the Counter are never null,
so change them from *mut Counter<C> to NonNull<Counter<C>>.
This makes it easier to verify the safety requirements for dereferences,
and allows the niche value optimization to apply.
taiki-e
approved these changes
Jan 22, 2024
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counter::{Sender, Receiver}hold shared references to a channel, similar to anArc. Their raw pointers to theCounterare never null, so change them from*mut Counter<C>toNonNull<Counter<C>>. This makes it easier to verify the safety requirements for dereferences, and allows the niche value optimization to apply.