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comp.lang.c FAQ list · Question 10.15

Q: Is there anything like an #ifdef for typedefs?


A: Unfortunately, no. (There can't be, because types and typedefs haven't been parsed at preprocessing time.) You may have to keep sets of preprocessor macros (e.g. MY_TYPE_DEFINED) recording whether certain typedefs have been declared.

See also questions 1.13 and 10.13.

References: ISO Sec. 5.1.1.2, Sec. 6.8.1
H&S Sec. 7.11.1 p. 225


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