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alloc::Layout: explicitly document size invariant on the type level #123048

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Apr 23, 2024
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alloc::Layout: explicitly document size invariant on the type level #123048

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4 changes: 3 additions & 1 deletion library/core/src/alloc/layout.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,9 @@ const fn size_align<T>() -> (usize, usize) {
/// An instance of `Layout` describes a particular layout of memory.
/// You build a `Layout` up as an input to give to an allocator.
///
/// All layouts have an associated size and a power-of-two alignment.
/// All layouts have an associated size and a power-of-two alignment. The size, when rounded up to
/// the nearest multiple of `align`, does not overflow isize (i.e., the rounded value will always be
/// less than or equal to `isize::MAX`).
///
/// (Note that layouts are *not* required to have non-zero size,
/// even though `GlobalAlloc` requires that all memory requests
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