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template <int n, int m> struct trial_divide_composite { enum { value = (n%m == 0) || trial_divide_composite<n, m-1>::value }; }; template <int n> struct trial_divide_composite<n, 1> { enum { value = 0 }; }; template <int n> struct is_prime { enum { value = !trial_divide_composite<n,n/2>::value }; }; template <> struct is_prime<2> { enum { value = 1 }; }; template <bool _> struct compile_successfully; template <> struct compile_successfully<true> {}; int main() { compile_successfully<(bool)is_prime< 42 >::value > _; }
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