Add OrPending future that wraps an optional future#2968
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This provides a different behavior for `Option<F>` than the existing Option future: instead of resolving to `Option<F::Output>` it resolves to `F::Output` if the future is present; otherwise it does not resolve. This can be useful for code paths that `select!` on multiple futures where one of the futures is optional. Using this wrapper allows sharing code paths since if the optional future is not present, that `select!` arm simply won't resolve.
rustbot
added
A-future
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We've been using something like this in libsignal for a while and it's been generally useful, so I figured it might be useful more broadly as well. |
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This provides a different behavior for
Option<F>than the existingfutures_util::future::Optionfuture: instead of resolving toOption<F::Output>it resolves toF::Outputif the future is present; otherwise it does not resolve.This can be useful for code paths that
select!on multiple futures where one of the futures is optional. Using this wrapper allows sharing code paths since if the optional future is not present, thatselect!arm simply won't resolve.