[libsigcplusplus] examples: Use sigc::signal<R(Args...)> syntax.

[Murray Cumming <murrayc src gnome org>]

commit 4f20da4c0370d8eef13005213b0976688a363383
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Mar 16 11:04:31 2016 +0100

    examples: Use sigc::signal<R(Args...)> syntax.

 examples/hello_world.cc   |    2 +-
 examples/member_method.cc |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/examples/hello_world.cc b/examples/hello_world.cc
index aff82f2..efe85e0 100644
--- a/examples/hello_world.cc
+++ b/examples/hello_world.cc
@@ -16,7 +16,7 @@ void on_print(const std::string& str)
 
 int main()
 {
-  sigc::signal<void, const std::string&> signal_print;
+  sigc::signal<void(const std::string&)> signal_print;
   
   signal_print.connect( sigc::ptr_fun(&on_print) );
   
diff --git a/examples/member_method.cc b/examples/member_method.cc
index bee4f1b..311f0ef 100644
--- a/examples/member_method.cc
+++ b/examples/member_method.cc
@@ -18,7 +18,7 @@ protected:
 
   virtual void on_print(int a);
   
-  using type_signal_print = sigc::signal<void, int>;
+  using type_signal_print = sigc::signal<void(int)>;
   type_signal_print signal_print;
     
 };