str: Add method .into_owned(self) -> ~str to Str #8204
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The method .into_owned() is meant to be used as an optimization when you need to get a ~str from a Str, but don't want to unnecessarily copy it if it's already a ~str. This is meant to ease functions that look like fn foo<S: Str>(strs: &[S]) Previously they could work with the strings as slices using .as_slice(), but producing ~str required copying the string, even if the vector turned out be a &[~str] already.
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The method .into_owned() is meant to be used as an optimization when you need to get a ~str from a Str, but don't want to unnecessarily copy it if it's already a ~str. This is meant to ease functions that look like fn foo<S: Str>(strs: &[S]) Previously they could work with the strings as slices using .as_slice(), but producing ~str required copying the string, even if the vector turned out be a &[~str] already. I don't have any concrete uses for this yet, since the one conversion I've done to `&[S]` so far (see PR #8203) didn't actually need owned strings. But having this here may make using `Str` more attractive. It also may be worth adding an `into_managed()` function, but that one is less obviously useful than `into_owned()`.
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…xFrednet [`erasing_op`] lint ignored when operation `Output` type is different from the type of constant `0` fixes rust-lang#7210 changelog: [`erasing_op`] lint ignored when operation `Output` type is different from the type of constant `0`
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The method .into_owned() is meant to be used as an optimization when you
need to get a ~str from a Str, but don't want to unnecessarily copy it
if it's already a ~str.
This is meant to ease functions that look like
Previously they could work with the strings as slices using .as_slice(),
but producing ~str required copying the string, even if the vector
turned out be a &[~str] already.
I don't have any concrete uses for this yet, since the one conversion I've done to
&[S]so far (see PR #8203) didn't actually need owned strings. But having this here may make usingStrmore attractive.It also may be worth adding an
into_managed()function, but that one is less obviously useful thaninto_owned().