22. Мультиметоды и диспетчеризация

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#include <iostream>

struct shape
{
    virtual ~shape() {}
};

struct square   : public shape {};
struct triangle : public shape {};
struct sphere   : public shape {};

void foo(shape*, shape*)
{
    std::cout << "shape*, shape*" << std::endl;
}

void foo(triangle*, sphere*)
{
    std::cout << "triangle*, sphere*" << std::endl;
}

int main()
{
    shape* s1 = new triangle;
    shape* s2 = new sphere;

    foo(s1, s2);

    delete s2;
    delete s1;

    return 0;
}