Expose the current members of a subsystem group.

simgear/structure/subsystem_mgr.cxx

@@ -281,6 +281,16 @@ SGSubsystemGroup::resume ()
         _members[i]->subsystem->resume();
 }
 
+string_list
+SGSubsystemGroup::member_names() const
+{
+	string_list result;
+	for (unsigned int i = 0; i < _members.size(); i++)
+		result.push_back( _members[i]->name );
+	
+	return result;
+}
+
 bool
 SGSubsystemGroup::is_suspended () const
 {

simgear/structure/subsystem_mgr.hxx

@@ -32,7 +32,7 @@
 
 #include <simgear/timing/timestamp.hxx>
 #include <simgear/structure/SGSharedPtr.hxx>
-
+#include <simgear/misc/strutils.hxx>
 
 class TimingInfo
 {
@@ -321,6 +321,12 @@ public:
      *
      */
     void set_fixed_update_time(double fixed_dt);
+	 
+	/**
+	 * retrive list of member subsystem names
+	 */ 
+    string_list member_names() const;
+	 
 private:
 
     class Member;