SGPropertyNode: add removeAllChildren() method

simgear/props/props.cxx

@@ -1075,6 +1075,21 @@ SGPropertyNode::removeChildren (const char * name, bool keep)
   return children;
 }
 
+void
+SGPropertyNode::removeAllChildren()
+{
+  for(unsigned i = 0; i < _children.size(); ++i)
+  {
+    SGPropertyNode_ptr& node = _children[i];
+    node->_parent = 0;
+    node->setAttribute(REMOVED, true);
+    node->clearValue();
+    fireChildRemoved(node);
+  }
+
+  _children.clear();
+}
+
 string
 SGPropertyNode::getDisplayName (bool simplify) const
 {

simgear/props/props.hxx

@@ -910,6 +910,7 @@ public:
   simgear::PropertyList getChildren (const std::string& name) const
   { return getChildren(name.c_str()); }
 
+  // TODO do we need the removeXXX methods to return the deleted nodes?
   /**
    * Remove child by position.
    */
@@ -941,6 +942,11 @@ public:
                                         bool keep = true)
   { return removeChildren(name.c_str(), keep); }
 
+  /**
+   * Remove all children (does not change the value of the node)
+   */
+  void removeAllChildren();
+
   //
   // Alias support.
   //