test.cpp

#include <cmath>
#include <iostream>
using namespace std;

template <int value> struct Test { int test() { return value; } };
template <> struct Test<0> { int test() { return 0; } };

int main()
{
	Test<static_cast<int>(floor(0.5))> a;
	cout << a.test() << endl;

	Test<static_cast<int>(log(22))> b;
	cout << b.test() << endl;

	return 0;
}