Re: Concatenated if and preprocessor

On 2025-03-14, pozz wrote:

Il 13/03/2025 16:44, pozz ha scritto:

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?

>
You're right, a real example is better to define my problem.
>
I have a project that can be compiled in different ways, depending on
the final product model (it's an embedded platform, it's a material
device).
I have three models with different characteristics: MODEL_A, MODEL_B,
MODEL_C. Three different builds that are managed at compile time by
defining MODEL macro as MODEL_A, MODEL_B or MODEL_C.
>
For each model, I could have a different features set. FEATURE_1,
FUTURE_2, FUTURE_3, ...
>
#if MODEL == MODEL_A
#  define FEATURE_1   1
#  define FEATURE_2   0
#  define FEATURE_3   0
#elif MODEL == MODEL_B
#  define FEATURE_1   0
#  define FEATURE_2   1
#  define FEATURE_3   0
#elif MODEL == MODEL_C
#  define FEATURE_1   1
#  define FEATURE_2   1
#  define FEATURE_3   1
#endif

So are you saying that the features are potentially independent of the
models, or that "Model A" explicitly defines that only "FEATURE_1" is
available (and will never support the other two) ?

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