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Add Box::replace #23309

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Add Box::replace#23309

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@mahkoh
mahkoh
opened on Mar 12, 2015

Box currently has no way to replace the contained value while returning the old one.

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  1. dotdash commented on Mar 12, 2015

    @dotdash
    dotdash
    on Mar 12, 2015
    Contributor

    Does this really need a method on Box?

    let mut b = Box::new(5);
let old = std::mem::replace(&mut *b, 10);

    doesn't look that bad.

    Edit: Made b mutable.

  2. mahkoh commented on Mar 12, 2015

    @mahkoh
    mahkoh
    on Mar 12, 2015
    ContributorAuthor

    You're right. Didn't think of that one.

  3. lnicola
    added a commit that references this issue on Sep 14, 2026

    Merge pull request rust-lang#23309 from Wilfred/fix/term-search-unify…

    fcdf7f6
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