std::vec: Use a valid value as lifetime dummy in iterator #9557
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@blake2-ppc: if you use |
The current implementation uses `&v[0]` for the lifetime struct field,
but that is a dangling pointer for iterators derived from zero-length
slices.
Example:
let v: [int, ..0] = []; println!("{:?}", v.iter())
std::vec::VecIterator<,int>{ptr: (0x7f3768626100 as *()), end: (0x7f3768626100 as *()), lifetime: &139875951207128}
To replace this parameter, use a field of type `Option<&'self ()>`
that is simply initialized with `None`, but still allows the iterator to
have a lifetime parameter.
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Updated to use your Option idea, this is so much better! Also I had "cleverly" used |
bors
added a commit
that referenced
this pull request
Sep 28, 2013
std::vec: Use a valid value as lifetime dummy in iterator
The current implementation uses `&v[0]` for the lifetime struct field,
but that is a dangling pointer for iterators derived from zero-length
slices.
Example:
let v: [int, ..0] = []; println!("{:?}", v.iter())
std::vec::VecIterator<,int>{ptr: (0x7f3768626100 as *()), end: (0x7f3768626100 as *()), lifetime: &139875951207128}
To replace this parameter, use a field of type `Option<&'self ()>`
that is simply initialized with `None`, but still allows the iterator to
have a lifetime parameter.
flip1995
pushed a commit
to flip1995/rust
that referenced
this pull request
Oct 6, 2022
…arth doc: make the usage of clippy.toml more clear Added a subsection for it, and move it after `Allowing/denying lints` which is more frequently used. fix rust-lang/rust-clippy#9265 *Please write a short comment explaining your change (or "none" for internal only changes)* changelog: none
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std::vec: Use a valid value as lifetime dummy in iterator
The current implementation uses
&v[0]for the lifetime struct field,but that is a dangling pointer for iterators derived from zero-length
slices.
Example:
To replace this parameter, use a field of type
Option<&'self ()>that is simply initialized with
None, but still allows the iterator tohave a lifetime parameter.