Linus Torvalds' Latest C Hacker Challenge on Google Plus

[espeed]

https://plus.google.com/u/0/102150693225130002912/posts/9gntjh57dXt

[chrisbroadfoot]

The commentary about the new G+ layout is tiring. Thankfully, real conversation starts shortly after.

tl;dr: most elegant solution is by "comex":

    #define is_set(macro) is_set_(macro)
    #define macrotest_1 ,
    #define is_set_(value) is_set__(macrotest_##value)
    #define is_set__(comma) is_set___(comma 1, 0)
    #define is_set___(_, v, ...) v