baseA;, 类衍生B; 类衍生C;
BaseA: 想要允许: 阶级衍生B: 公共基础A
但是,如果有人试图做DerivedC:公共基础A QQgt;想限制这一点。
有可能吗?
您可以让所有 BaseA s 构建器私有,并将 DerivedB 添加为 friend 的 BaseA s。
class BaseA
{
friend class DerivedB;
private:
BaseA();
};
class DerivedB : BaseA
{
};
class DerivedC : BaseA //error - I get it when I try to create an object in MSVS
//but in principle it works
{
};
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