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14 #if !defined(_NULLPTR_T) || \
15 (__has_feature(modules) && !__building_module(_Builtin_stddef))
19 #if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED)
21 typedef decltype(
nullptr) nullptr_t;
23 using ::
std::nullptr_t;
25 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
26 typedef typeof(
nullptr) nullptr_t;