error forward declaration of xxx
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问题:
file1 include file2,file2 中用到了某个数据结构 A(定义在file3 中)的定义,但file1 和file2 都没有include file3,或file1 所在的工程没有设置 file3 的路径,造成编译器不能识别 A
解决:
file1 中include file3,如有必要,在工程文件中设置file3 的路径
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