In most cases, there is no reason to test for access to functions that have been part of ANSI/ISOC since the 1989 version of the standard came out, or for availability of the standard C headers.
绝大部分情况下,没有理由去测试是否有权使用自 1989 版本标准出现以后的 ANSI/ISO C 中的函数或者标准的 C 头文件是否可用。
2
Xerces-C + + USES this larger character representation to exchange text as UTF-16 as opposed to UTF-8 or ISO-8859.