35 lines
1.1 KiB
Rust
35 lines
1.1 KiB
Rust
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use crate::ascii;
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#[cfg(not(test))]
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impl<const N: usize> [u8; N] {
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/// Converts this array of bytes into a array of ASCII characters,
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/// or returns `None` if any of the characters is non-ASCII.
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#[unstable(feature = "ascii_char", issue = "110998")]
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#[must_use]
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#[inline]
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pub fn as_ascii(&self) -> Option<&[ascii::Char; N]> {
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if self.is_ascii() {
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// SAFETY: Just checked that it's ASCII
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Some(unsafe { self.as_ascii_unchecked() })
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} else {
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None
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}
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}
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/// Converts this array of bytes into a array of ASCII characters,
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/// without checking whether they're valid.
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///
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/// # Safety
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///
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/// Every byte in the array must be in `0..=127`, or else this is UB.
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#[unstable(feature = "ascii_char", issue = "110998")]
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#[must_use]
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#[inline]
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pub const unsafe fn as_ascii_unchecked(&self) -> &[ascii::Char; N] {
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let byte_ptr: *const [u8; N] = self;
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let ascii_ptr = byte_ptr as *const [ascii::Char; N];
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// SAFETY: The caller promised all the bytes are ASCII
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unsafe { &*ascii_ptr }
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}
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}
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