pnoltes commented on a change in pull request #272:
URL: https://github.com/apache/celix/pull/272#discussion_r457657591
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File path: misc/experimental/promise/api/celix/Deferred.h
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@@ -136,12 +139,81 @@ namespace celix {
* the specified Promise. The returned Promise will be resolved with a
failure of IllegalStateException if the
* associated Promise was already resolved when the specified Promise
was resolved.
*/
- //TODO support void promises
- //Promise<void> resolveWith(Promise<T> with);
Review comment:
A Promise<void> can be used as way to see if something is done (ok or
nok (onResolve on onFailure).
The use case for resolving a void promise with a typed promise is (IMO) if
you are not interested in the result downstream, but use want to use the
promise as a sync.
So for example you get Promise<double> from some function (maybe 3rd party)
where the double is the time it took to process, but in "our" API we just want
to indicate whether were a done (success or failed). In this case you can
create a Promise<void> and resolve it with the Promise<double> (regardless if
the Promise<double> is already resolved or not)
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