Make path api less allocation happy #8978
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Note that I left dirname as returning ~str, because both of its implementations work by calling dir_path, which produces a new path, and thus we cannot borrow the result from &'a self passed to dirname (because the new path returned by dir_path will not live long enough to satisfy the lifetime 'a).
In most cases this involved removing a ~str allocations or clones (yay), or coercing a ~str to a slice. In a few places, I had to bind an intermediate Path (e.g. path.pop() return values), so that it would live long enough to support the borrowed &str. And in a few places, where the code was actively using the property that the old API returned ~str's, I had to put in to_owned() or clone(); but in those cases, we're trading an allocation within the path.rs code for one in the client code, so they neutralize each other.
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Looks trivially correct to me. My current work on rewriting path is on my path-rewrite branch, but it's not ready yet, so @pnkfelix's work may as well be used for now. |
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Sep 5, 2013
…py, r=huonw A [dialogue](#8909 (diff)) on PR #8909 inspired me to make this change. r? anyone (It is possible that `std::path` itself will soon be replaced with a new implementation that kballard's working on, as mentioned in the dialogue linked above, but this revision is simple enough that I figured I'd offer it up.)
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A dialogue on PR #8909 inspired me to make this change.
r? anyone
(It is possible that
std::pathitself will soon be replaced with a new implementation that kballard's working on, as mentioned in the dialogue linked above, but this revision is simple enough that I figured I'd offer it up.)