Add a io::Writer wrapper that supports pushback
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Description
Saturday Nov 24, 2012 at 20:17 GMT
For earlier discussion, see https://github.com/rust-lang/rust/issues/4031
This issue was labelled with: A-libs, P-low in the Rust repository
C's stdio has a function ungetc that lets you push back a single char on a stream. While we could expose support for the c functions, this wouldn't help with our str/bytes writers. Instead, how about we make a trait/impl io::Writer wrapper that supports lookahead and pushback for any io::Writers?
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Read the earlier discussion in issue 4031, then inspect io::Writer and the str/bytes writers mentioned here. Define what the wrapper should provide for lookahead and pushback across arbitrary io::Writer implementations, and confirm that the resulting trait/impl design is agreed before implementation.
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Assessment
- Tech stack
- rust
- Domain
- operating-systems
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 30/100