Can I selectively (force) inline a function?

Question

In the book Clean Code (and a couple of others I have come across and read) it is suggested to keep the functions small and break them up if they become large. It also sugge

Answer 1

There is nothing that prevents you to put inline in a static function in a .cpp file.

Some compilers have the option to force an inline function, see e.g. the GCC attribute((always_inline)) and a ton of options to fine tune the inlining optimizations (see -minline-* parameters).

My recommendation is to use inline or even better static inline wherever you see fit, and let the compiler decide. They usually do it pretty well.