In previous versions, a relationship lookup function was provided. Version 7 provides three new lookups.
在以前的版本中，提供了关系查找函数。
The options parameter provides an extra means of debugging and adjusts the lookup function to your liking
options参数提供了根据您的喜好来调试和调整查找功能的额外方法
It generates a hash table from the predetermined list of valid command-line options and a lookup function whose time complexity is o (1).
它将从预定的有效命令行选项列表和时间复杂度为O(1)的查找函数中生成一个散列表。
If you're familiar with socket programming, you might be looking for gethostbyname and other such calls, which are used to perform the host-lookup function.
如果熟悉套接字编程，那么您可能会寻找gethostbyname和其他类似的调用，这些调用都可以用来执行主机查找功能。
G: This option generates the lookup table as a static global variable rather than hiding it by generating it inside the lookup function (the default behavior).
G：该选项将生成查找表并将其作为静态全局变量，而不是在查找函数内生成以隐藏该表(默认行为)。
RAND_LOOKUP, a random lookup function that selects a value for the destination column from a lookup table based on a random number as the subscript in the lookup table.
RAND _ LOOKUP，随机查找函数，该函数根据作为查找表中下标的随机数从查找表中选择目标列的值。
RAND_LOOKUP, a random lookup function that selects a value for the destination column from a lookup table based on a random number as the subscript in the lookup table.
RAND _ LOOKUP，随机查找函数，该函数根据作为查找表中下标的随机数从查找表中选择目标列的值。
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