[pointer] Make "at least" machinery generic #1166
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jswrenn
approved these changes
May 2, 2024
This replaces `at_least::Xxx` with `AtLeast<Xxx>`, which in turn allows us to write `AtLeast<T>` in a context where `T` is generic. The use case in this commit is to relax the bound on `Copy` and `Clone` to: Shared: AtLeast<I::Aliasing> ...which is equivalent to saying that `I::Aliasing` is at *most* `Shared`. This permits both `Shared` and `Any` `Ptr`s to be copied or cloned. Co-authored-by: Jack Wrenn <jswrenn@amazon.com>
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This replaces
at_least::XxxwithAtLeast<Xxx>, which in turn allows us to writeAtLeast<T>in a context whereTis generic.The use case in this commit is to relax the bound on
CopyandCloneto:Shared: AtLeast<I::Aliasing>
...which is equivalent to saying that
I::Aliasingis at mostShared. This permits bothSharedandAnyPtrs to be copied or cloned.