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Add 'must_use' attribute to 'char::len_utf8' and 'char::len_utf16';

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This commit is contained in:
Gabriel Bjørnager Jensen 2024-09-25 10:42:43 +02:00
parent 1b5aa96d60
commit b466fa6db8
1 changed files with 4 additions and 0 deletions
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4
library/core/src/char/methods.rs
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@ -606,6 +606,7 @@ impl char {
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "const_char_len_utf", since = "1.52.0")] #[rustc_const_stable(feature = "const_char_len_utf", since = "1.52.0")]
#[inline] #[inline]
#[must_use]
pub const fn len_utf8(self) -> usize { pub const fn len_utf8(self) -> usize {
len_utf8(self as u32) len_utf8(self as u32)
} }
@ -637,6 +638,7 @@ impl char {
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "const_char_len_utf", since = "1.52.0")] #[rustc_const_stable(feature = "const_char_len_utf", since = "1.52.0")]
#[inline] #[inline]
#[must_use]
pub const fn len_utf16(self) -> usize { pub const fn len_utf16(self) -> usize {
len_utf16(self as u32) len_utf16(self as u32)
} }
@ -1738,6 +1740,7 @@ impl EscapeDebugExtArgs {
} }
#[inline] #[inline]
#[must_use]
const fn len_utf8(code: u32) -> usize { const fn len_utf8(code: u32) -> usize {
match code { match code {
..MAX_ONE_B => 1, ..MAX_ONE_B => 1,
@ -1748,6 +1751,7 @@ const fn len_utf8(code: u32) -> usize {
} }
#[inline] #[inline]
#[must_use]
const fn len_utf16(code: u32) -> usize { const fn len_utf16(code: u32) -> usize {
if (code & 0xFFFF) == code { 1 } else { 2 } if (code & 0xFFFF) == code { 1 } else { 2 }
} }