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author | Wedson Almeida Filho <wedsonaf@gmail.com> | 2022-11-10 17:41:22 +0100 |
---|---|---|
committer | Miguel Ojeda <ojeda@kernel.org> | 2022-12-04 01:59:15 +0100 |
commit | 76e2c2d9a22a402e816607ae575b1a194cc45a31 (patch) | |
tree | eea7876a6b253f8d79efbc263935e0c29edfb5f8 /rust/alloc | |
parent | 266def2a0f5bbe44b11902bd4c93b9c5d8b8d708 (diff) |
rust: error: add `From` implementations for `Error`
Add a set of `From` implementations for the `Error` kernel type.
These implementations allow to easily convert from standard Rust
error types to the usual kernel errors based on one of the `E*`
integer codes.
On top of that, the question mark Rust operator (`?`) implicitly
performs a conversion on the error value using the `From` trait
when propagating. Thus it is extra convenient to use.
For instance, a kernel function that needs to convert a `i64` into
a `i32` and to bubble up the error as a kernel error may write:
fn f(x: i64) -> Result<...> {
...
let y = i32::try_from(x)?;
...
}
which will transform the `TryFromIntError` into an `Err(EINVAL)`.
Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Co-developed-by: Nándor István Krácser <bonifaido@gmail.com>
Signed-off-by: Nándor István Krácser <bonifaido@gmail.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>
Reviewed-by: Finn Behrens <me@kloenk.dev>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'rust/alloc')
0 files changed, 0 insertions, 0 deletions