#include using namespace std; template struct _isPrime { enum {value = N % M && _isPrime::value}; }; template struct _isPrime { enum {value = 1}; }; template struct isPrime { enum {value = _isPrime::value}; }; int main() { cout << "2: " << isPrime<2>::value << endl; cout << "3: " << isPrime<3>::value << endl; cout << "4: " << isPrime<4>::value << endl; cout << "5: " << isPrime<5>::value << endl; cout << "6: " << isPrime<6>::value << endl; cout << "7: " << isPrime<7>::value << endl; cout << "8: " << isPrime<8>::value << endl; cout << "9: " << isPrime<9>::value << endl; cout << "10: " << isPrime<10>::value << endl; cout << "11: " << isPrime<11>::value << endl; cout << "12: " << isPrime<12>::value << endl; cout << "13: " << isPrime<13>::value << endl; cout << "14: " << isPrime<14>::value << endl; cout << "15: " << isPrime<15>::value << endl; cout << "16: " << isPrime<16>::value << endl; cout << "17: " << isPrime<17>::value << endl; cout << "18: " << isPrime<18>::value << endl; cout << "19: " << isPrime<19>::value << endl; cout << "20: " << isPrime<20>::value << endl; return 0; }

Compile-Time Prime Checking Using Templates