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docs: clarify asyncCheck vs waitFor

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citycide 2018-10-27 11:52:57 -05:00 • committed by Dominik Picheta
commit 4362ba7293
2 changed files with 5 additions and 2 deletions
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4
lib/pure/asyncdispatch.nim
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@ -145,7 +145,9 @@ export asyncfutures, asyncstreams
##
## Futures should **never** be discarded. This is because they may contain
## errors. If you do not care for the result of a Future then you should
## use the ``asyncCheck`` procedure instead of the ``discard`` keyword.
## use the ``asyncCheck`` procedure instead of the ``discard`` keyword. Note
## however that this does not wait for completion, and you should use
## ``waitFor`` for that purpose.
##
## Examples
## --------

3
lib/pure/asyncfutures.nim
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@ -339,7 +339,8 @@ proc asyncCheck*[T](future: Future[T]) =
## Sets a callback on ``future`` which raises an exception if the future
## finished with an error.
##
## This should be used instead of ``discard`` to discard void futures.
## This should be used instead of ``discard`` to discard void futures,
## or use ``waitFor`` if you need to wait for the future's completion.
assert(not future.isNil, "Future is nil")
future.callback =
proc () =