c++ - Can __cplusplus ever be defined and equal to zero? -


this question has answer here:

the question came of whether 1 should wrap extern "c" using #if or #ifdef. i.e.:

#if __cplusplus extern "c" { #endif

or

#ifdef __cplusplus extern "c" { #endif

which begs question: there ever situation __cplusplus defined equal zero?

according standard, __cplusplus macro must defined, exact definition depends on c++ standard being used not zero.

for example, c++11 must 201103l, note "it intended future versions of standard replace value of macro greater value."

historically, in ancient non-conforming compilers dig up, __cplusplus defined 0 indicate non-conformance standard. of historical interest.

see: how __cplusplus directive defined in various compilers?


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