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View Compilation Error

0_0_1172800_12612.cpp
0_0_1172800_12612.cpp(22) : error C2451: “std::basic_string<_Elem,_Traits,_Ax>::_Myt”类型的条件表达式是非法的
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Ax=std::allocator<char>
        ]
        没有可用于执行该转换的用户定义的转换运算符,或者无法调用该运算符


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