[glibmm] Action/ActionGroup: Make some parameter parameters optional.

[Murray Cumming <murrayc src gnome org>]

commit 842f841182e51a66bd1ffc9a158a80b52438f71f
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Oct 8 09:51:03 2013 +0200

    Action/ActionGroup: Make some parameter parameters optional.
    
    * gio/src/action.[hg|ccg]: Add an activate() method that takes no
      parameter.
    * gio/src/actiongroup.hg: activate_action(): Add a method overload
      that takes no parameter parameter.

 gio/src/action.ccg     |    5 +++++
 gio/src/action.hg      |    4 ++++
 gio/src/actiongroup.hg |    2 +-
 3 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/gio/src/action.ccg b/gio/src/action.ccg
index d3dd74a..cc9a5f4 100644
--- a/gio/src/action.ccg
+++ b/gio/src/action.ccg
@@ -24,4 +24,9 @@
 namespace Gio
 {
 
+void Action::activate()
+{
+  g_action_activate(gobj(), 0);
+}
+
 } // namespace Gio
diff --git a/gio/src/action.hg b/gio/src/action.hg
index ecd8c70..b981e25 100644
--- a/gio/src/action.hg
+++ b/gio/src/action.hg
@@ -149,6 +149,10 @@ public:
   _WRAP_METHOD(Glib::VariantBase get_state_variant() const, g_action_get_state)
 
   /** Activates the action.
+   */
+  void activate();
+
+  /** Activates the action.
    *
    * The @a parameter must be the correct type of parameter for the action (ie:
    * the parameter type given at construction time), if any.
diff --git a/gio/src/actiongroup.hg b/gio/src/actiongroup.hg
index 2edafaa..4d706d7 100644
--- a/gio/src/actiongroup.hg
+++ b/gio/src/actiongroup.hg
@@ -126,7 +126,7 @@ public:
   _WRAP_METHOD(void change_action_state(const Glib::ustring& action_name, const Glib::VariantBase& value), 
g_action_group_change_action_state)
 
   //TODO: Add templated method, renaming this to activate_action_variant().
-  _WRAP_METHOD(void activate_action(const Glib::ustring& action_name, const Glib::VariantBase& parameter), 
g_action_group_activate_action)
+  _WRAP_METHOD(void activate_action(const Glib::ustring& action_name, const Glib::VariantBase& 
parameter{?}), g_action_group_activate_action)
 
   _WRAP_METHOD(void action_added(const Glib::ustring& action_name), g_action_group_action_added)
   _WRAP_METHOD(void action_removed(const Glib::ustring& action_name), g_action_group_action_removed)