Metaprogramming in functional C++

One more paradigm of programming is metaprogramming. Due to the fact that we are not working with the regular process of programming, this method of coding is completely different. A program’s three stages of coding, compiling, and executing are referred to as a “regular process” in this context. It’s obvious that a program does what it’s supposed to do when it is executed. The compiler uses linking and compilation to generate an executable. Metaprogramming, on the other hand, is where the code is executed during the compilation of the code. This might sound magical if you are dealing with it for the first time. How can we execute code if the program doesn’t even exist yet? Recalling what we learned about templates in the previous chapters, we know that the compiler processes them with more than one pass. In the first pass, the compiler defines the necessary types and parameters that are used in the template...