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RFC: 'task lifetime #8726

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huonw opened this issue Aug 24, 2013 · 7 comments
Closed

RFC: 'task lifetime #8726

huonw opened this issue Aug 24, 2013 · 7 comments
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A-lifetimes Area: Lifetimes / regions

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@huonw
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huonw commented Aug 24, 2013

Add a 'task lifetime that represents things that live as long as the task, e.g. borrowing a @T would give a &'task T.

I haven't met any instance where I really needed this; but @bblum said he'd be interested, and I have met a few lifetime issues with borrowing things out of @ in a chain (but this is probably just #3511).
@bblum
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bblum commented Aug 24, 2013

My use case would be in reading a task's name. It would be fn() -> &'task str.

@bblum
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bblum commented Aug 24, 2013

I don't think it would be safe for borrowing a @T into a &'task T but you could definitely put the latter inside one of the former.

The main extra capability would be to have a lifetime that fulfills 'static but does not fulfill Send.

@graydon
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graydon commented Aug 24, 2013

Yeah, certain tls interfaces (that internally promise not to delete their referent) would also qualify.

@emberian
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cc @nikomatsakis @pnkfelix

@nikomatsakis
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seems like a post 1.0 thing to me, but I'm not particularly opposed to the idea

@eddyb
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eddyb commented Mar 2, 2014

Would be nice to be able to do type IdentInterner = &'task StrInterner; and remove that @.
The TLD only really needs 'static without Send, maybe there's a simple way of achieving that?

@rust-highfive rust-highfive mentioned this issue Sep 24, 2014
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This issue has been moved to the RFCs repo: rust-lang/rfcs#295

xFrednet pushed a commit to xFrednet/rust that referenced this issue May 21, 2022
@bors
Auto merge of rust-lang#8726 - Serial-ATA:issue-8723, r=dswij,xFrednet
6889d09 
Fix `match_single_binding` suggestion for assign expressions

changelog: Fix suggestion for assign expressions in [`match_single_binding`]
closes: rust-lang#8723
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@graydon @eddyb @nikomatsakis @emberian @huonw @bblum @rust-highfive