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What is ":-!!' in C code?

I bumped into this strange macro code in /usr/include/linux/kernel.h : /* Force a compilation error if condition is true, but also produce a result (of value 0 and type size_t), so the expression can be used e.g. in a structure initializer (or where-ever else comma expressions aren't permitted). */ #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))

How to manage a redirect request after a jQuery Ajax call

Im using $.post() to call a Servlet using Ajax and then use the resulting HTML fragment to replace a div element in the User's current page. However, if the session timeouts the server sends a redirect directive to send the user to the login page. Nonetheless, JQuery is replacing the div element with the contents of the login page, forcing the user's eyes to witness a rare scene indeed.