C ++标准ISO / IEC 14882：2003说：

C++ Standard ISO/IEC 14882:2003 says:

23.2.2.4/31

23.2.2.4/31

注意：稳定：保留等效元素的相对顺序。如果抛出异常，列表中元素的
顺序是不确定的。

Notes: Stable: the relative order of the equivalent elements is preserved. If an exception is thrown the order of the elements in the list is indeterminate.