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
c c-preprocessor
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