List of iterators to collect entries from various lists
问题 A class TaskGroup mainly contains a list of Task s. I want to collect certain tasks ta1 , ta2 , tb3 , ... from various groups ga , gb , gc , ... and use this list in a display window/class. The choice of tasks for the collection is of no concern for this question. (As the question is rather conceptual than technical, the examples are mostly pseudo code. Since I'm using Qt in this particular case, I'll be using Qt classes, but the question shouldn't be limited to this case.) class Task; class