Appendix: Closing Notes

We are now at the end of this book. Templates are not the easiest part of C++ programming. Indeed, people usually find them difficult or horrendous. However, templates are heavily used in C++ code, and it’s likely that whatever kind of code you’re writing, you’ll be using templates daily.

We started the book by learning what templates are and why we need them. We then learned how to define function templates, class templates, variable templates, and alias templates. We learned about template parameters, specialization, and instantiation. In the third chapter, we learned about templates with variable numbers of arguments, which are called variadic templates. The next chapter was dedicated to more advanced template concepts, such as name binding, recursion, argument deduction, and forwarding references.

We then learned about the use of type traits, SFINAE, and constexpr if, and we explored the collection of type traits available in...