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Interesting Template.

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I'm not sure if this is known or used, but it seems kinda novel to me. I don't know how useful it would be.
#include <stdio.h>

template <typename T>
class C : public T {
  public:
	C() {}
	~C() {}
	void foo() { y++; }

  private:
    int y;
};

class B {
  public:
	virtual ~B() {}

	virtual void foo() { x++; }
	virtual void bar() { x++; }
	void bam() { printf("%d", x); }

  protected:
	B() : x(0) {}

	int x;
};

int main(int argc, char* argv[]) {
	C<B> d;
	d.foo();
	d.bar();
	d.bam();
}

Compiles as is on MSVC++ 2005 EE. Note: The template class is inheriting the template parameter. Funky eh?

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There's even weirder:

template<class D> class Base { /* stuff using D */ };

class Derived : public Base<Derived> { /* stuff */ };


→ James Coplien. "Curiously Recurring Template Pattern". C++ Report, Feb. 1995

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