a class-key must be used when declaring a friend的问题
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今天在游戏引擎的时候遇见了这样一个问题就是
在dev c++下
编写如下代码:
其中 ONLY_ONE的内容是
会出现一个 a class-ey muse be used when declaring a friend 的错误
最后发现只要在 friend后面加一个class 就好了
看来还是经验不错啊
具体就是会这样
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