4 ms·

IIRC the latest C standards adopted the union trick for type punning; it is the only correct way to access floating-point as int, or create an array of function

IIRC the latest C standards adopted the union trick for type punning; it is the only correct way to access floating-point as int, or create an array of function pointers of different types. (The latter is not something I've seen any compiler ever exploit though)

saagarjha 8y ago
> it is the only correct way to access floating-point as int Well, other than memcpy. And it's kinda sketchy in the way that they did it: it was a tacked-on footnote in the C99 standard retained through to C11. > create an array of function pointers of different types Well, void * * or char * * (spaces so Hacker News doesn’t eat it) would do just as well…
- caf 8y ago
  Function pointers aren't guaranteed to convert to and from object pointers.
  - saagarjha 8y ago
    Oops, sorry, that's POSIX and not the C standard. I must have gotten them mixed up. Thanks for the correction!
Asooka 8y ago
What about the latest C++ standards :) ?