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d6246e579f
int to string or string to int operations. "pure" essentially says that this function has no side effects aside from its result, and the result depends on nothing else other than its arguments and global variables. "const" is a more strict form of "pure", where the function also doesn't access any global variables. From the gcc manual: "Such a function can be subject to common subexpression elimination and loop optimization just as an arithmetic operator would be." This also tells the compiler that it is safe to call the function fewer times than the code says to, given the same arguments, since the result will always be the same. git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@38452 65c4cc65-6c06-0410-ace0-fbb531ad65f3