Detecting int128 support

Some compilers have support for extended arithmetic types such as 128-bit floats or integers. Let's take a quick glance at how to use them using Boost.

We'll be creating a method that accepts three parameters and returns the multiplied value of those methods. If compiler supports 128-bit integers, then we use them. If compiler supports long long, then we use it; otherwise, we need to issue a compile-time error.

Getting ready

Only the basic knowledge of C++ is required.

How to do it...

What do we need to work with 128-bit integers? Macros...