[libsigcplusplus/libsigc++-2-10] C++11: signal: Use a range-based for loop.

[Murray Cumming <murrayc src gnome org>]

commit 6e279a310d6b497378a3c9585ad98394f8a46840
Author: Murray Cumming <murrayc murrayc com>
Date:   Sat Apr 2 09:04:28 2016 +0200

    C++11: signal: Use a range-based for loop.

 sigc++/macros/signal.h.m4 |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/sigc++/macros/signal.h.m4 b/sigc++/macros/signal.h.m4
index 73109e3..42a832d 100644
--- a/sigc++/macros/signal.h.m4
+++ b/sigc++/macros/signal.h.m4
@@ -234,11 +234,11 @@ FOR(1, $1,[
       signal_exec exec(impl);
       temp_slot_list slots(impl->slots_);
 
-      for (auto it = slots.begin(); it != slots.end(); ++it)
+      for (const auto& slot : slots)
         {
-          if (it->empty() || it->blocked())
+          if (slot.empty() || slot.blocked())
             continue;
-          (reinterpret_cast<call_type>(it->rep_->call_))(LIST(it->rep_, LOOP(_A_a%1, $1)));
+          (reinterpret_cast<call_type>(slot.rep_->call_))(LIST(slot.rep_, LOOP(_A_a%1, $1)));
         }
     }