Question

当我同时定义两个指令时，如何进行编译错误？我想要错误

#define ENG
#define POL
#if defined POL
#if defined ENG

这里不是

#define ENG
//#define POL
#if defined POL
#if defined ENG

Answer 1

#if defined( ENG ) && defined( POL )
#error You can't define both!
#endif