Write A C++ program that requires a deep understanding of advanced C++ concepts, such as template metaprogramming or the use of complex data structures and algorithms.

Answer

#include <iostream> // A metafunction that calculates the factorial of a given number at compile-time template <int N> struct Factorial { static constexpr int value = N * Factorial<N - 1>::value; }; // Specialization of the Factorial metafunction for the base case (N = 0) template <> struct Factorial<0> { static constexpr int value = 1; }; int main() { // Calculate the factorial of 5 at compile-time and print the result std::cout << Factorial<5>::value << std::endl; return 0; }

OUTPUT