rust/library/std/src/io/util, branch auto

Implement default methods for io::Empty and io::Sink

2025-03-10T08:38:20+00:00

Eliminate any redundant, unobservable logic from the their default method implementations. The observable changes are that `Write::write_fmt` for both types now ignores the formatting arguments, so a user fmt impl which has side effects is not invoked, and `Write::write_all_vectored` for both types does not advance the borrowed buffers. Neither behavior is guaranteed by the docs and the latter is documented as unspecified. `Empty` is not marked as vectored, so that `Chain` and `Chain<_, Empty>` are not forced to be vectored.

Reformat using the new identifier sorting from rustfmt

2024-09-22T23:11:29+00:00

Reformat `use` declarations.

2024-07-28T22:26:52+00:00

The previous commit updated `rustfmt.toml` appropriately. This commit is the outcome of running `x fmt --all` with the new formatting options.

Rollup merge of #98154 - vidhanio:master, r=workingjubilee

2023-07-30T18:36:33+00:00

merge functionality of `io::Sink` into `io::Empty` Many times, there is a need for a simple dummy `io::Read`er + `io::Write`r, but currently the only options are `io::Empty` and `io::Sink` respectively. Having both of their functionality together requires writing your own boilerplate for something that makes sense to have in the standard library. This PR adds the functionality of `io::Sink` to `io::Empty`, making `io::Empty` be able to perform the tasks of both of the previous structs. (This idea was first mentioned in #24235) Note: I also updated some doc comments in `io::utils` in this pull request to fix inconsistencies between `io::Sink` and `io::Empty`. API Change Proposal: https://github.com/rust-lang/libs-team/issues/49

Extend io::copy buffer reuse to BufReader too

2023-06-17T09:07:04+00:00

previously it was only able to use BufWriter. This was due to a limitation in the BufReader generics that prevented specialization. This change works around the issue by using `where Self: Read` instead of `where I: Read`. This limits our options, e.g. we can't access BufRead methods, but it happens to work out if we rely on some implementation details.

feat: merge functionality of `io::Sink` into `io::Empty`

2023-05-05T13:32:33+00:00

non-linux platforms

2022-08-05T16:18:51+00:00

Signed-off-by: Nick Cameron

std::io: migrate ReadBuf to BorrowBuf/BorrowCursor

2022-08-04T14:29:32+00:00

Signed-off-by: Nick Cameron

read_buf

2021-11-03T05:47:20+00:00

specialize io::copy to use the memory of the writer if it is a BufWriter

2021-01-31T13:58:03+00:00