From: Manuel Nickschas <sputnick@quassel-irc.org>
Date: Wed, 31 Oct 2018 23:39:21 +0000 (+0100)
Subject: funchelpers: Support the invocation of non-void callables
X-Git-Tag: test-travis-01~98
X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=commitdiff_plain;h=a22e08480288685d73d9abd18c6a1087451c388b;hp=a22e08480288685d73d9abd18c6a1087451c388b

funchelpers: Support the invocation of non-void callables

Let invokeWithArgsList() handle and return the return value of
non-void callables wrapped in a QVariant. To avoid special-casing,
the invocation of a void callable also returns a (default-constructed,
thus invalid) QVariant.

To indicate failure, wrap the QVariant in a boost::optional that is
empty if the callable could not be invoked.
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