[glibmm] C++11: Replace virtual keyword with override keyword on destructors.

[Murray Cumming <murrayc src gnome org>]

commit 906262d82e3cdcfcd3af3a2d431458eae2d4b740
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Dec 24 12:14:08 2015 +0100

    C++11: Replace virtual keyword with override keyword on destructors.
    
    This ensures that the base class is really virtual.

 gio/giomm/socketsource.h      |    2 +-
 glib/glibmm/error.h           |    2 +-
 glib/glibmm/interface.h       |    2 +-
 glib/glibmm/main.h            |    6 +++---
 glib/glibmm/object.h          |    2 +-
 glib/glibmm/streamiochannel.h |    2 +-
 6 files changed, 8 insertions(+), 8 deletions(-)
---
diff --git a/gio/giomm/socketsource.h b/gio/giomm/socketsource.h
index 826dca5..2d60af5 100644
--- a/gio/giomm/socketsource.h
+++ b/gio/giomm/socketsource.h
@@ -108,7 +108,7 @@ public:
 protected:
   SocketSource(const Glib::RefPtr<Socket>& socket, Glib::IOCondition condition,
     const Glib::RefPtr<Cancellable>& cancellable);
-  virtual ~SocketSource() noexcept;
+  ~SocketSource() noexcept override;
 };
 
 } // namespace Gio
diff --git a/glib/glibmm/error.h b/glib/glibmm/error.h
index c9758ab..ab0317b 100644
--- a/glib/glibmm/error.h
+++ b/glib/glibmm/error.h
@@ -38,7 +38,7 @@ public:
   Error(const Error& other);
   Error& operator=(const Error& other);
 
-  virtual ~Error() noexcept;
+  ~Error() noexcept override;
 
   GQuark domain() const;
   int code() const;
diff --git a/glib/glibmm/interface.h b/glib/glibmm/interface.h
index f7cd864..b6bafa7 100644
--- a/glib/glibmm/interface.h
+++ b/glib/glibmm/interface.h
@@ -63,7 +63,7 @@ public:
    * if necessary.
    */
   explicit Interface(GObject* castitem);
-  virtual ~Interface() noexcept;
+  ~Interface() noexcept override;
 
   // noncopyable
   Interface(const Interface&) = delete;
diff --git a/glib/glibmm/main.h b/glib/glibmm/main.h
index 47ce0dc..f92e6f2 100644
--- a/glib/glibmm/main.h
+++ b/glib/glibmm/main.h
@@ -821,7 +821,7 @@ public:
 
 protected:
   explicit TimeoutSource(unsigned int interval);
-  virtual ~TimeoutSource() noexcept;
+  ~TimeoutSource() noexcept override;
 
   bool prepare(int& timeout) override;
   bool check() override;
@@ -845,7 +845,7 @@ public:
 
 protected:
   IdleSource();
-  virtual ~IdleSource() noexcept;
+  ~IdleSource() noexcept override;
 
   bool prepare(int& timeout) override;
   bool check() override;
@@ -873,7 +873,7 @@ protected:
    */
   IOSource(GSource* cast_item, GSourceFunc callback_func);
 
-  virtual ~IOSource() noexcept;
+  ~IOSource() noexcept override;
 
   bool prepare(int& timeout) override;
   bool check() override;
diff --git a/glib/glibmm/object.h b/glib/glibmm/object.h
index 0ab2b78..566780b 100644
--- a/glib/glibmm/object.h
+++ b/glib/glibmm/object.h
@@ -113,7 +113,7 @@ protected:
   Object(); //For use by C++-only sub-types.
   explicit Object(const Glib::ConstructParams& construct_params);
   explicit Object(GObject* castitem);
-  virtual ~Object() noexcept; //It should only be deleted by the callback.
+  ~Object() noexcept override; //It should only be deleted by the callback.
 
 public:
   //static RefPtr<Object> create(); //You must reimplement this in each derived class.
diff --git a/glib/glibmm/streamiochannel.h b/glib/glibmm/streamiochannel.h
index 8b6f98c..bcadc87 100644
--- a/glib/glibmm/streamiochannel.h
+++ b/glib/glibmm/streamiochannel.h
@@ -34,7 +34,7 @@ namespace Glib
 class StreamIOChannel : public Glib::IOChannel
 {
 public:
-  virtual ~StreamIOChannel() noexcept;
+  ~StreamIOChannel() noexcept override;
 
   static Glib::RefPtr<StreamIOChannel> create(std::istream& stream);
   static Glib::RefPtr<StreamIOChannel> create(std::ostream& stream);