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用宏定义c++编译器兼容c程序

#ifdef __cplusplus
extern "c"
{

}

typedef enum{
 CHANNAL_1 = 1;
 CHANNAL_2 = 2;
 CHANNAL_3 = 3;
}a;

void func(a x){
xxx
}
//调用方法如下
a a1 = CHANNAL_1;
func(a1);