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closures: No explanation of &: #405

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kornelski opened this issue Jan 13, 2015 · 2 comments
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closures: No explanation of &: #405

kornelski opened this issue Jan 13, 2015 · 2 comments

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@kornelski
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The closure syntax uses a mysterious sigil &: which isn't explained.
@kornelski kornelski mentioned this issue Jan 13, 2015
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@strega-nil
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&: means a closure by reference, i.e. the variables that are closed over are passed by reference.
&mut: is the same, but they're now mutable.
move means that all variables are actually moved into the closure.

More reading here.

@mdinger
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mdinger commented Feb 12, 2015

That sigil is gone now: rust-lang/rust#21843

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@steveklabnik @kornelski @strega-nil @mdinger