#include <iostream>
#include <memory>
 
struct Shape {};
 
struct Circle : public Shape
{
    Circle()
    {
        std::cout << __PRETTY_FUNCTION__ << '\n';
    }
};
 
struct Rectangle : public Shape
{
    Rectangle()
    {
        std::cout << __PRETTY_FUNCTION__ << '\n';
    }
};
 
int main()
{
    for (int i=0; i<5; ++i)
    {
        std::unique_ptr<Shape> sp = (i % 2)
            ? std::unique_ptr<Shape>(new Circle())
            : std::unique_ptr<Shape>(new Rectangle());
    }
 
}

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