Imagine a standard diamond inheritance. Class A defines pure virtual function fx, class B defines implementation for fx, classes C and D do nothing with fx. When trying to call fx on instance of class D you'll get 'ambiguous function call' error although there is only one implementation of fx. This can be solved by B and C inheriting from A in virtual manner. Is it a Imagine a standard diamond inheritance. Class A
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钻石继承和纯虚函数
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