C preprocessor: using #if inside #define?
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Published on 2010-05-14T05:03:31Z
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c
|preprocessor
I want to write a macro that spits out code based on the boolean value of its parameter. So say DEF_CONST(true) should be expanded into "const", and DEF_CONST(false) should be expanded into nothing.
Clearly the following doesn't work because we can't use another preprocessor inside #defines:
#define DEF_CONST(b_const) \
#if (b_const) \
const \
#endif
Any idea about how to do it?
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