A common way to make headers safe USES the preprocessor to define a header guard.
使得头文件安全的通用做法，是使用预处理器定义头文件保护符。
Theoretically (since I've not done this myself), you could guard against hackers by comparing HTTP header information that is sent as part of the HTTP request.
从理论上来说（因为我自己没做过），您可以通过比较作为HTTP 请求的一部分发送的 HTTP头信息来防止遭到黑客攻击。
The guard is used to avoid reprocessing the contents of a header file if the header has already been seen.
头文件保护符用于避免在已经见到头文件的情况下重新处理该头文件的内容。
The guard is used to avoid reprocessing the contents of a header file if the header has already been seen.
头文件保护符用于避免在已经见到头文件的情况下重新处理该头文件的内容。
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