Yuan Peng Chiang highlighted virtual void speak() const { std::cout...

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virtual void speak() const { std::cout << "Mammal speak!\n"; }

From

Cover of Sams Teach Yourself C++ in 24 Hours, fifth edition

Hour 17. Using Polymorphism and Derived Classes
from Sams Teach Yourself C++ in 24 Hours, fifth edition
by Rogers Cadenhead, Jesse Liberty
Publisher: Sams
Released: April 2011

Note

sub-classes has to override this function. without virtual, base class's function will be called

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