Are IEEE float and double guaranteed to be the same size on any OS?

Question

I\'m working on a OS portable database system. I want our database files to be OS portable so that customers can move their database files to other kinds of OS\'s at their d

Answer 1

--cut-- Nevermind https://stackoverflow.com/a/24157568/2422450 provides a better explanation for the float sizes.

If you're however thinking about storing these floats in binary data files, do make sure you don't mess up the byte order or endianness. If you're dumping raw floats, some systems store the bytes in a different order, so casting the 4 bytes you just read to a double might give some surprising results.