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
template<int N, int M>
bool less (char const(&a)[N], char const(&b)[M])
{
for (int i = 0; i<N && i<M; ++i) {
if (a[i]<b[i]) return true;
if (b[i]<a[i]) return false;
}
return N < M;
}