polymorphic_pointer_downcast example

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## `polymorphic_pointer_downcast` example

    #include <boost/polymorphic_pointer_cast.hpp>

    class Fruit { public: virtual ~Fruit(){} };
    class Banana : public Fruit {};

    // use one of these:

    typedef Fruit* FruitPtr;
    typedef std::shared_ptr<Fruit> FruitPtr;
    typedef boost::shared_ptr<Fruit> FruitPtr;
    typedef boost::intrusive_ptr<Fruit> FruitPtr;

    void f(FruitPtr fruit) {
      // ... logic which leads us to believe it is a banana
      auto banana = boost::polymorphic_pointer_downcast<Banana>(fruit);
      ...
    }