From: Gregory Bok on
Say you have a class with a virtual method, and then in a derived
class, the virtual method is declared without the "virtual" keyword.

class A
{
public:
virtual void method();
};

class B
{
public:
void method();
};

Is this effectively an emulation of the "final" construct, e.g. this
becomes a leaf class in the absence of other overridable methods?
Does this impact the ability to treat instances of B polymorphically?
Or is the virtuality inherited implicitly from the root of the
inheritance tree even if it is omitted in intermediate classes? Is
the behavior here implementation dependent?

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