Add variant of LocalPool with bound lifetime #2846
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haroldbruintjes
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Adds derivatives of LocalPool and BoundLocalSpawner with a generic lifetime parameter that replaces the previously used 'static, and aliases both types with a 'static parameter to the originals. Add a BoundLocalSpawn trait in a similar fashion. At the same time simplify the implementation of Spawn, LocalSpawn and BoundLocalSpawn to just work on any type implementing Deref to a type implementing a spawn trait.
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This modifies
LocalPoolto accept a generic lifetime parameter, and renames it toBoundLocalPoolparameter, withLocalPoolnow being an alias forBoundLocalPool<'static>. Associated types (IncomingandLocalSpawner) get the same treatment where applicable. Add additionalBoundLocalSpawnandBoundLocalSpawnExttraits that extend the unbound variants with functions spawning bound-lifetime tasks.The purpose of this is to enable the use of an executor that does not require the futures assigned to it to exist any longer than it does. Existing code should of course still just work as it is.
Somewhat tangentially related, the implementations for the various spawner traits have been consolidated to just require
Deref, but that need not be part of the same change and does break compatibility. I left it in as a suggestion, but I suspect that should be reverted :).