#define private public

今日看到了一句话，#define private public瞬间吓尿了。这define好厉害。好迷惑人啊。所有东西都public了。

http://blog.youkuaiyun.com/wangjieest/article/details/7978382

C++限制访问数据类型的bug啊。一句话就突破了

关于define与typedefi的区别。一个预处理，一个编译器。以下引自stackoverflow。

#define is a preprocessor token: the compiler itself will never see it.
typedef is a compiler token: the preprocessor does not care about it.

You can use one or the other to achieve the same effect, but it's better to use the proper one for your needs

#define MY_TYPE int
typedef int My_Type;

When things get "hairy", using the proper tool makes it right

#define FX_TYPE void (*)(int)
typedef void (*stdfx)(int);

void fx_typ(stdfx fx); /* ok */
void fx_def(FX_TYPE fx); /* error */