[libsigcplusplus] typed_slot_rep: Make constructor explicit.

[Murray Cumming <murrayc src gnome org>]

commit fa03a1440db961936092673684b0dec1442ce283
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Apr 21 23:28:44 2016 +0200

    typed_slot_rep: Make constructor explicit.

 sigc++/functors/slot.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/sigc++/functors/slot.h b/sigc++/functors/slot.h
index 19168d9..98934fe 100644
--- a/sigc++/functors/slot.h
+++ b/sigc++/functors/slot.h
@@ -55,7 +55,7 @@ public:
    * The notification callback is registered using visit_each().
    * @param functor The functor contained by the new slot_rep object.
    */
-  inline typed_slot_rep(const T_functor& functor)
+  inline explicit typed_slot_rep(const T_functor& functor)
   : slot_rep(nullptr, &destroy, &dup), functor_(functor)
   {
     sigc::visit_each_trackable(slot_do_bind(this), functor_);