Declarations of variables and functions at filescope are external by default.
默认情况下,在文件域中声明变量和函数是外部的。
2
A thorough discussion of handling all file types is far beyond the scope of this article.
对处理所有文件类型的全面讨论远远超出了本文的范围。
3
The inclusion of iostream and the definition of the EXPORT_API macro can be considered code-invariant parts of the file throughout the scope of the project.