How to write curiously recurring templates with more than 2 layers of inheritance?

Posted by Kyle on Stack Overflow See other posts from Stack Overflow or by Kyle
Published on 2010-05-12T17:00:47Z Indexed on 2010/05/12 17:04 UTC
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All the material I've read on Curiously Recurring Template Pattern seems to one layer of inheritance, ie Base and Derived : Base<Derived>. What if I want to take it one step further?

#include <iostream>
using std::cout;


template<typename LowestDerivedClass> class A {
public:
    LowestDerivedClass& get() { return *static_cast<LowestDerivedClass*>(this); }
    void print() { cout << "A\n"; }
};
template<typename LowestDerivedClass> class B : public A<LowestDerivedClass> {
    public: void print() { cout << "B\n"; }
};
class C : public B<C> {
    public: void print() { cout << "C\n"; }
};

int main()
{
    C c;
    c.get().print();

//  B b;             // Intentionally bad syntax, 
//  b.get().print(); // to demonstrate what I'm trying to accomplish

    return 0;
}

How can I rewrite this code to compile without errors (and output "C\nB\n")?

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