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View Compilation Error

0_0_27799443_28637.cpp
0_0_27799443_28637.cpp(7) : error C2371: “a”: 重定义；不同的基类型
        0_0_27799443_28637.cpp(5) : 参见“a”的声明
0_0_27799443_28637.cpp(7) : error C2371: “b”: 重定义；不同的基类型
        0_0_27799443_28637.cpp(5) : 参见“b”的声明
0_0_27799443_28637.cpp(12) : error C2088: “<<”: 对于 class 非法


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