<format>: `format_to(back_inserter(string), ...)` should reserve space.
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format
performance
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- C++
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Description
Much like the special treatment of string added in #1894, format_to should try to detect that a string is passed and reserve string.size() + _Fmt.size() + _Args._Estimate_required_capacity(). This would make format_to a string just as fast as format
Contributor guide
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
Start by locating the format_to implementation and the string back inserter path in the STL sources. Trace how format currently reserves capacity and how _Fmt and _Args estimate required capacity. Done means format_to with a string reserves the proposed capacity and has tests or measurements showing behavior comparable to format.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- performance
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100