error: no match for ‘operator<<’ (operand types are ‘std::basic_

（认知有限，如有不妥，还请告知，欢迎讨论）

完整报错：error: no match for ‘operator<<’ (operand types are ‘std::basic_ostream<char>’ and ‘const char [2]’)

解决方法：

加上#include <iostream>

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[1]https://stackoverflow.com/questions/42175638/error-while-operator-overloading-error-no-match-for-operator-operand-type