如果我记得没错的话，它的直径约为6公分。
如果记得没错的话，Stroustroup在“C++的设计与演化”一书中说到他应该写一个标准程序库来支持多继承，我等无福消受啊。
If I recall it right, Stroustroup wrote in "The Design and Evolution of C++" that he delayed a standard library in favor of multiple inheritance. I would have enjoyed it more the other way.
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