The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017
constexpr bool isPrime (unsigned int p)
{
for (unsigned int d=2; d<=p/2; ++d) {
if (p % d == 0) {
return false; // found divisor without remainder
}
}
return p > 1; // no divisor without remainder found
}