UB33
definition⚓︎
The characters ’, \, ", //, or /* occur in the sequence between the < and > delimiters, or the
characters ’, \, //, or /* occur in the sequence between the " delimiters, in a header name
preprocessing token.
在头文件预处理中,字符'、\、"、//、/*出现在<与>,或者"与"之间,是未定义行为。
description⚓︎
这是对头文件名的特殊规定,应该是为了编译词法分析过程方便的统一要求。