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Try to guess a smarter initial capacity in Vec::from_iter #53086

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Try to guess a smarter initial capacity in Vec::from_iter #53086

wants to merge 2 commits into from

Commits on Aug 8, 2018

  1. Try to guess a smarter initial capacity in Vec::from_iter

    @scottmcm
    scottmcm committed Aug 8, 2018
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  2. Be much less clever about things 

    This one only helps lower>0, but by doing so means it's always strictly less than 100% overhead, same as the normal doubling algorithm.  And thus doesn't need to do the try_reserve dance or a post-extend cleanup.
    @scottmcm
    scottmcm committed Aug 8, 2018
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