How could I make it compile error? I did write
RefPtr<Foo> xxx = yyy; xxx.forget(); It is ok for compiling on my Mac. The comment [1] said " Makes it a compile time error to not use the return value of a function which has this type", but how do I make the clang format take effect? BTW, if you want to ignore the return value, you can use the special version of Unused [2], but it will leak if you don't manually delete the pointer. [1] http://searchfox.org/mozilla-central/rev/48ea452803907f2575d81021e8678634e8067fc2/mfbt/Attributes.h#519-521 [2] http://searchfox.org/mozilla-central/rev/48ea452803907f2575d81021e8678634e8067fc2/mfbt/AlreadyAddRefed.h#112-117 2017-08-24 17:31 GMT+08:00 <jyaven...@mozilla.com>: > On Thursday, August 17, 2017 at 1:02:56 PM UTC+2, Aryeh Gregor wrote: > > Note that in this case you cannot ignore the return value -- it must > > be assigned to an nsCOMPtr or a RefPtr, or else it will leak. Ideally > > we would allow a return type of nsCOMPtr<nsIMutableArray>&&, but > > currently I think we don't. > > This is not entirely correct. > > alreadyAddRefed<T> is marked MOZ_MUST_USE_TYPE. > > If you do not use the return value, it will not compile. > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
