CODEWITHSUNDEEP
cmacrosc-preprocessor
theanine
theanine

Reputation: 1008

How to shorten a macro for conditional "0" prefixing

I would like to do this:

#if ID1 < 10
#define ID1_STR  "0" #ID1
#else
#define ID1_STR  #ID1
#endif

But, I don't want to repeat this for every "ID". Is there a way I can create some wrapper, where I can just do this:

WRAPPER(ID1)

Upvotes: 1

Views: 53

Answers (1)

Rob
Rob

Reputation: 1974

Can't be done with the preprocessor, since it is not possible for a macro to expand to a set of preprocessor directives (#if, #define, etc). And that's what would be needed to do what you seek.

Upvotes: 1

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