Day 5: Object Oriented Programming with C++

The Vigenère cipher and object composition in C++	We start by implementing the last of our ciphers: the Vigenère cipher. This requires the use of object composition, a powerful way of reusing code.
Dynamic Polymorphism in C++	We consider the concepts of polymorphism and shared type in C++ by reviewing the built-in types and templated types as seen in the previous weeks. We motivate sharing type by considering how objects may change through the lifetime of a program and how templates, whilst allowing polymorphic behaviour, lock the behaviour in when our program is compiled. In C++ we show how runtime polymorphism is realised with public inheritance and pure abstract classes specifying an interface.
Smart Pointers in C++	We see how to use smart pointers to manage the lifetime of objects beyond the scope in which they are created.

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