You can use static assertions in global scope and inside namespaces, function bodies, or class declarations.
可以在全局范围以及在名称空间、函数体或类声明内使用静态断言。
2
The scope resolution operator should sit between the class name and the static property you wish to access.
范围解析操作符应位于类名和希望访问的静态属性之间。
3
The valid lifetime and scope of application responses and static content may differ, although applications typically have a shorter lifetime and smaller scope than static content pages.