std::string root_name( ): Given a path that begins from the root of the file system, this routine returns a string that contains the first character of the PATHNAME.

string root_name( )：在给定从文件系统根目录开始的路径的情况下，此例程将返回包含PATHNAME的第一个字符的字符串。

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std::string root_name( ): Given a path that begins from the root of the file system, this routine returns a string that contains the first character of the PATHNAME.

string root_name( )：在给定从文件系统根目录开始的路径的情况下，此例程将返回包含PATHNAME的第一个字符的字符串。

youdao