Not only does it slow down the program due to the virtual function indirect call, it is also an opaque wall where no metaprogram can get past.
它
仅因为虚拟函数的间接调用降低了程序的速度，它还是一
明的墙，元编程无法
过它。
Not only does it slow down the program due to the virtual function indirect call, it is also an opaque wall where no metaprogram can get past.
它仅因为虚拟函数的间接调用降低了程序的速度，它还是一明的墙，元编程无法过它。
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