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Add must_use attribute to len_utf8 and len_utf16. #130819

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Sep 25, 2024
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Add must_use attribute to len_utf8 and len_utf16. #130819

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4 changes: 4 additions & 0 deletions library/core/src/char/methods.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -606,6 +606,7 @@ impl char {
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "const_char_len_utf", since = "1.52.0")]
#[inline]
#[must_use]
pub const fn len_utf8(self) -> usize {
len_utf8(self as u32)
}
Expand Down Expand Up @@ -637,6 +638,7 @@ impl char {
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "const_char_len_utf", since = "1.52.0")]
#[inline]
#[must_use]
pub const fn len_utf16(self) -> usize {
len_utf16(self as u32)
}
Expand Down Expand Up @@ -1738,6 +1740,7 @@ impl EscapeDebugExtArgs {
}

#[inline]
#[must_use]
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these are private functions, so I don't think it matters much whether they are must_use, it seems very unlikely to cause problems if they aren't

const fn len_utf8(code: u32) -> usize {
match code {
..MAX_ONE_B => 1,
Expand All @@ -1748,6 +1751,7 @@ const fn len_utf8(code: u32) -> usize {
}

#[inline]
#[must_use]
const fn len_utf16(code: u32) -> usize {
if (code & 0xFFFF) == code { 1 } else { 2 }
}
Expand Down
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