If you need runtime polymorphism, you must not use pass-by-value.
如果你需要运行时多态，你不能使用按值传递。
Why does declaring runtime polymorphism for template instantiations result in linker error?
为什么声明为模板实例化运行时多态导致链接器错误呢？
How to calculate the circumference of the three-dimensional graphics (what function)? Required to achieve runtime polymorphism.
对立体图形周长怎么计算(用什么函数)？要求实现运行时的多态性。
This allows you to swap out at runtime a different class exposing the same methods, taking advantage of polymorphism.
它允许利用多态性在运行时换出一个不同的类来公开相同的方法。
Since all objects in the class pool are upcast to their common base class, the polymorphism of the method leads to that which object method will be executed can only be ascertained at runtime.
由于所有位于对象池中的对象都被上溯到它们的基类型，方法多态使得只有在运行时刻才能真正确定到底哪个对象的方法被执行。
Since all objects in the class pool are upcast to their common base class, the polymorphism of the method leads to that which object method will be executed can only be ascertained at runtime.
由于所有位于对象池中的对象都被上溯到它们的基类型，方法多态使得只有在运行时刻才能真正确定到底哪个对象的方法被执行。
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