C++-Class-Util & Helper
C++-Class-Util & Helper
https://zhuanlan.zhihu.com/p/352749160
A Utility class is understood to only have static methods and be stateless. You would not create an instance of such a class.
A Helper can be a utility class or it can be stateful or require an instance be created.
翻译一下。
Util类，一般是无状态的，只包含静态方法。使用时无需创建类的实例。
Helper类，可以有状态（类的成员变量），一般需要创建实例才能使用。