binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversion)
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C++内容
binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits,class std::allocator >' (or there is no acceptable conversion)