[gtkmm-documentation] signals/custom example: Use the sigc::signal<R(Args...)> syntax

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 2ad875a149d338f52fbceb19a419c7e4634b0160
Author: Kjell Ahlstedt <kjell ahlstedt bredband net>
Date:   Thu Nov 24 13:48:57 2016 +0100

    signals/custom example: Use the sigc::signal<R(Args...)> syntax

 examples/book/signals/custom/server.h |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/examples/book/signals/custom/server.h b/examples/book/signals/custom/server.h
index b29340e..690713b 100644
--- a/examples/book/signals/custom/server.h
+++ b/examples/book/signals/custom/server.h
@@ -1,5 +1,3 @@
-//$Id: server.h 114 2004-02-10 14:50:18Z murrayc $ -*- c++ -*-
-
 /* gtkmm example Copyright (C) 2002 gtkmm development team
  *
  * This program is free software; you can redistribute it and/or modify
@@ -30,7 +28,7 @@ public:
   void do_something();
 
   //signal accessor:
-  typedef sigc::signal<void, bool, int> type_signal_something;
+  using type_signal_something = sigc::signal<void(bool, int)>;
   type_signal_something signal_something();
 
 protected: