Executing the code in compile-time

As we discussed earlier, template metaprogramming will run the code in compile-time by creating a new code. Now, let's see how we can get the compile-time constant and generate a compile-time class in this section.

Getting a compile-time constant

To retrieve a compile-time constant, let's create a code that has the template for a Fibonacci algorithm in it. We will consume the template so the compiler will provide the value in compile time. The code should be as follows:

    /* fibonaccimeta.cpp */
    #include <iostream>

    using namespace std;

    // Defining Fibonacci template
    // to calculate the Fibonacci sequence
    template <int number>
    struct Fibonacci
    {
      enum
      {
        value =
            Fibonacci<number - 1>::value +
            Fibonacci<number - 2>::value
      };
    };

    // Defining template for
    // specific input value
    // 'number' = 1
    template <>
    struct Fibonacci<1...