Add HashMap.entry_or_clone() method
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Description
Sometimes I have a key type which implements Clone, but for efficiency reasons I don't want to clone it unless it's absolutely necessary.
In this case it would be nice to have a method
my_hash_map.entry_or_clone(&k)
which behaves identically to
my_hash_map.entry(k.clone())
but only bothers to clone k if the key doesn't already exist in my_hash_map.
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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
Start by reviewing the proposed HashMap.entry_or_clone(&k) API alongside the existing entry(k.clone()) behavior. Define the method's expected result for existing and missing keys, then evaluate the API through the Rust RFC process; done means the proposal has a decided design and any required implementation scope is clear.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- backend-api-design
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100