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`sub_ptr()` is equivalent to `usize::try_from().unwrap_unchecked()`, not `usize::from().unwrap_unchecked()`. 

`usize::from()` gives a `usize`, not `Result<usize>`, and `usize: From<isize>` is not implemented.
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Chayim Refael Friedman 2023-01-23 14:42:32 +02:00 committed by GitHub
parent 6b3cd03fdb
commit 236f8231a6
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2 changed files with 2 additions and 2 deletions
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2
library/core/src/ptr/const_ptr.rs
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@ -731,7 +731,7 @@ impl<T: ?Sized> *const T {
/// This computes the same value that [`offset_from`](#method.offset_from)
/// would compute, but with the added precondition that the offset is
/// guaranteed to be non-negative. This method is equivalent to
/// `usize::from(self.offset_from(origin)).unwrap_unchecked()`,
/// `usize::try_from(self.offset_from(origin)).unwrap_unchecked()`,
/// but it provides slightly more information to the optimizer, which can
/// sometimes allow it to optimize slightly better with some backends.
///

2
library/core/src/ptr/mut_ptr.rs
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@ -904,7 +904,7 @@ impl<T: ?Sized> *mut T {
/// This computes the same value that [`offset_from`](#method.offset_from)
/// would compute, but with the added precondition that the offset is
/// guaranteed to be non-negative. This method is equivalent to
/// `usize::from(self.offset_from(origin)).unwrap_unchecked()`,
/// `usize::try_from(self.offset_from(origin)).unwrap_unchecked()`,
/// but it provides slightly more information to the optimizer, which can
/// sometimes allow it to optimize slightly better with some backends.
///