I would like something like: #define C_OR_CPP(C, CPP) #ifdef cplusplus\ CPP\ #else\ C__\ #endif

Question

Asked: May 30, 20262026-05-30T13:59:00+00:00 2026-05-30T13:59:00+00:00

I would like something like:

#define C_OR_CPP(C__, CPP__) #ifdef __cplusplus\
CPP__\
#else\
C__\
#endif

Is it possible?
Maybe some dirty hack with #include ?

Reason:
I make a header where a struct uses a member variable of type vector<stuff>*, but in C i want it to simply be void*, you know.

TIA

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Editorial Team · Answer 1 · 2026-05-30T13:59:02+00:00

Editorial Team

What’s the problem with

#ifdef __cplusplus
#define C_OR_CPP(C, CPP) CPP
#else
#define C_OR_CPP(C, CPP) C
#endif

(Leaving names with double underscore to the implementation per phresnel remark)

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