Just a small annoyance really as I can work around the problem by wrapping the derived function instead of using the 'using' keyword but why doesn't the following work (the compiler tells me that 'get_elem' is still pure virtual in 'Bar' class).Just a small annoyance really as I can work aro
阅读背景：
通过“使用”单独继承的方法重写纯虚函数。
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