Flow control with template metaprogramming

Code flow is an important aspect in coding a program. In many programming languages, they have an if-else, switch, and do-while statement to arrange the flow of the code. Now, let's refactor the usual flow of code to become a template-based flow. We will start by using the if-else statement, followed by the switch statement, and finally ending with the do-while statement, all in templates.

Deciding the next process by the current condition

Now it's time to use the template as we discussed previously. Let's suppose we have two functions that we have to choose by a certain condition. What we usually do is use the if-else statement as follows:

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

    using namespace std;

    // Function that will run
    // if the condition is TRUE
    void TrueStatement()
    {
      cout << "True Statement is run." << endl;
    }

    // Function that will run
    // if the condition is FALSE
    void...