Re: Concatenated if and preprocessor

On 3/13/25 11:44, pozz wrote:

Consider this code:
 
if (cond1) {
...
} else if (cond2) {
...
} else if (cond3) {
...
}
 
I want to activate every single if with a macro preprocessor. All the
combinations are possible: only the first, only the second, only the
third, the first and second... and so on.
 
What's the best method to have a clean code that is always compiled
without errors?

The cleanest way to do this involves trusting the compiler to quietly
remove unused branches:

#ifdef COND1
    if (cond1) }
    } else
#endif

#ifdef COND2
    if (cond2) {
    } else
#endif

#ifdef COND3
    if (cond3 ) {
    }
#else
    ; // Alternatively, use {}
#endif