util: backport C++17 optional
This commit also makes code style of parameter packs consistent.
refs #3753
Change-Id: I1e301d25b73501b0b28678e6095bbb5619a0e760
diff --git a/src/util/signal-signal.hpp b/src/util/signal-signal.hpp
index 7756eae..fb5b14b 100644
--- a/src/util/signal-signal.hpp
+++ b/src/util/signal-signal.hpp
@@ -86,13 +86,13 @@
* who emits this signal, and some handlers may not be executed.
*/
void
- operator()(const TArgs&...args);
+ operator()(const TArgs&... args);
/** \brief (implementation detail) emits a signal
* \note This overload is used by signal-emit.hpp.
*/
void
- operator()(const TArgs&...args, const DummyExtraArg&);
+ operator()(const TArgs&... args, const DummyExtraArg&);
// make Owner a friend of Signal<Owner, ...> so that API for owner can be called
friend Owner;