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如果我将 aistreambuf_iterator周围的包装器传递stringstream给需要这种迭代器的函数，我如何在函数返回后重新使用（覆盖）流的现有缓冲区，而不触发堆分配？ （clear插入新字符时似乎会导致重新分配。）
istreambuf_iterator
stringstream
clear