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#include <iostream>
template <typename Derived>
class A {
public:
A() {}
void b() { static_cast<Derived*>(this)->c(); }
void c() { std::cout << "1\n"; }
};
class B : public A<B> {
public:
void c() { std::cout << "2\n"; }
};
int main() {
B b;
b.b();
}
