?? stdarg.h
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#ifndef _STDARG_H#define _STDARG_H/* Values returned by __builtin_classify_type. */enum type_class{ no_type_class = -1, void_type_class, integer_type_class, char_type_class, enumeral_type_class, boolean_type_class, pointer_type_class, reference_type_class, offset_type_class, real_type_class, complex_type_class, function_type_class, method_type_class, record_type_class, union_type_class, array_type_class, string_type_class, set_type_class, file_type_class, lang_type_class};typedef void *__gnuc_va_list;#define va_start(AP, LASTARG) \ (AP = ((__gnuc_va_list) __builtin_next_arg (LASTARG)))#define va_end(AP) ((void)0)#define va_arg(AP, TYPE) \ ((__builtin_classify_type (* (TYPE *) 0) == array_type_class \ || __builtin_classify_type (* (TYPE *) 0) == record_type_class) \ ? (AP = (__gnuc_va_list)((char *)(AP) + sizeof (char *)), \ **((TYPE **)(void *)((char *)(AP) - sizeof (char *)))) \ : (AP = (__gnuc_va_list)((char *)(AP) + sizeof(TYPE)), \ *((TYPE *)(void *)((char *)(AP) - sizeof(TYPE)))))typedef __gnuc_va_list va_list;#endif?? 快捷鍵說明
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