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C++ 打印enum class枚举类

在 C++11中，由于枚举类（enum class）无法通过 std::cout 标准流打印，为了解决这个问题，提供了三种解决方案。

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C++ POD type

POD is an acronym for **Plain Old Data** in C++, referring to a data type that can be copied and transferred via simple memory copy