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[C++, TCL] - Iterator Q

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Hey all, Anyone know how to nicely perform this logic, with Tree Container Library and STL?
tcl::unique_tree<GameObj*>::pre_order_iterator io = _objects.pre_order_begin();

while ( io != _objects.pre_order_end() ) {
  //pseudo start
  GameObj *o = (*io);
  if ( o->doUpdate() ) {
    //if the game object needs to be updated, update and continue to iterate down the tree
  } else {
    //Otherwise, skip the update for this and it's childen    
    io = _objects.next_iterator_of_level(io?);

  //pseudo end


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