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Add todo comment on using a niche type for fmt flags.

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Mara Bos 2025-03-21 16:51:14 +01:00
parent ba2809e085
commit 9b7060ad31
1 changed files with 2 additions and 0 deletions
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library/core/src/fmt/mod.rs
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@ -299,6 +299,8 @@ pub struct FormattingOptions {
/// a &str size when stored in (the upper bits of) the same field. /// a &str size when stored in (the upper bits of) the same field.
/// (fmt::Arguments will make use of this property in the future.) /// (fmt::Arguments will make use of this property in the future.)
/// ``` /// ```
// Note: This could use a special niche type with range 0x8000_0000..=0xfdd0ffff.
// It's unclear if that's useful, though.
flags: u32, flags: u32,
/// Width if width flag (bit 27) above is set. Otherwise, always 0. /// Width if width flag (bit 27) above is set. Otherwise, always 0.
width: u16, width: u16,