rec.cpp (cpp-lecture/old/rec.cpp)

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#include <memory>
#include <iostream>

struct Foo
{
    std::shared_ptr<Foo>   next;

    ~Foo()
    {
        std::cout << "~Foo" << std::endl;
    }
};

int
main()
{
    std::shared_ptr<Foo>   A = std::shared_ptr<Foo>(new Foo);

    A->next       = std::shared_ptr<Foo>(new Foo);
    A->next->next = A;
}