alamb commented on code in PR #7027:
URL: https://github.com/apache/arrow-rs/pull/7027#discussion_r1930266601
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arrow-data/src/data.rs:
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@@ -1779,6 +1783,34 @@ impl PartialEq for ArrayData {
}
}
+mod private {
+ /// A boolean flag that cannot be mutated outside of unsafe code.
+ ///
+ /// Defaults to a value of false.
+ ///
+ /// This structure is used to enforce safety in the [`ArrayDataBuilder`]
+ #[derive(Debug)]
+ pub struct UnsafeFlag(bool);
+
+ impl UnsafeFlag {
+ /// Creates a new `UnsafeFlag` with the value set to `false`
+ #[inline]
+ pub const fn new() -> Self {
+ Self(false)
+ }
+
+ #[inline]
Review Comment:
the point of structure is that the compiler enforces it can only ever be set
to true via unsafe code
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