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core/char: Add comment to to_digit()

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This commit is contained in:
Tobias Bieniek 2018-11-14 11:26:00 +01:00
parent 64a5172652
commit 7843e2792d
1 changed files with 3 additions and 0 deletions
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3
src/libcore/char/methods.rs
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@ -122,6 +122,9 @@ pub fn is_digit(self, radix: u32) -> bool {
#[inline] #[inline]
pub fn to_digit(self, radix: u32) -> Option<u32> { pub fn to_digit(self, radix: u32) -> Option<u32> {
assert!(radix <= 36, "to_digit: radix is too high (maximum 36)"); assert!(radix <= 36, "to_digit: radix is too high (maximum 36)");
// the code is split up here to improve execution speed for cases where
// the `radix` is constant and 10 or smaller
let val = if radix <= 10 { let val = if radix <= 10 {
match self { match self {
'0' ..= '9' => self as u32 - '0' as u32, '0' ..= '9' => self as u32 - '0' as u32,