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clone_from in the standard library #28481
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C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.E-help-wantedCall for participation: Help is requested to fix this issue.Call for participation: Help is requested to fix this issue.I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.
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C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.E-help-wantedCall for participation: Help is requested to fix this issue.Call for participation: Help is requested to fix this issue.I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.
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Clonetrait has a sadly-neglectedclone_frommethod that clones a value into an existing one. There is a default implementation, but it's fairly naive and therefore not optimal for all cases, notably collections.It would be good if the major collections had better implementations for
clone_fromwhere it can be implemented more efficiently./cc @rust-lang/libs