Syntax:

    inline int functionA( int a ) {
    ...
    }

The inline keyword requests that the compiler expand a given function in place, as opposed to inserting a call to that function. The inline keyword is a request, not a command, and the compiler is free to ignore it for whatever reason.

When a function definition is included in a class definition, the compiler should try to automatically inline that function. No inline keyword is necessary in this case.