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Guarantee that char has the same size and alignment as u32 #116894

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Nov 4, 2023
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Guarantee that char has the same size and alignment as u32 #116894

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Guarantee that `char` has the same size and alignment as `u32`
joshlf Oct 18, 2023
c278bc1
Update library/core/src/primitive_docs.rs
joshlf Oct 25, 2023
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9 changes: 8 additions & 1 deletion library/core/src/primitive_docs.rs
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Expand Up @@ -283,7 +283,7 @@ mod prim_never {}
/// `char` type. For technical reasons, there is additional, separate
/// documentation in [the `std::char` module](char/index.html) as well.
///
/// # Validity
/// # Validity and Layout
///
/// A `char` is a '[Unicode scalar value]', which is any '[Unicode code point]'
/// other than a [surrogate code point]. This has a fixed numerical definition:
Expand Down Expand Up @@ -330,6 +330,13 @@ mod prim_never {}
/// ("noncharacters"); and some may be given different meanings by different
/// users ("private use").
///
/// `char` is guaranteed to have the same size and alignment as `u32` on all
/// platforms.
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/// ```
/// use std::alloc::Layout;
/// assert_eq!(Layout::new::<char>(), Layout::new::<u32>());
/// ```
///
/// [Unicode code point]: https://www.unicode.org/glossary/#code_point
/// [Unicode scalar value]: https://www.unicode.org/glossary/#unicode_scalar_value
/// [non-exhaustive match]: ../book/ch06-02-match.html#matches-are-exhaustive
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