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alloc: make RawVec round up allocation sizes to next power-of-two #29848

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alloc: make RawVec round up allocation sizes to next power-of-two #29848

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Commits on Dec 9, 2015

  1. docs: clarify String/Vec docs related to capacity 

    * adds a note to String::shrink_to_fit to match the same note on Vec regarding
  additional capacity
* change asserts in docs to treat capacity as a lower bound
    @Swatinem
    Swatinem committed Dec 9, 2015
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Commits on Dec 10, 2015

  1. alloc: make RawVec round up allocation sizes to next power-of-two 

    The system allocator may give more memory than requested, usually rounding
up to the next power-of-two.
This PR uses a similar logic inside RawVec to be able to make use of this
excess memory.

NB: this is *not* used for `with_capacity` and `shrink_to_fit` pending
discussion in rust-lang#29931
    @Swatinem
    Swatinem committed Dec 10, 2015
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