My uses of mmap have only over been memoization. Where I didn't care about byte order, and instead just assumed the files wouldn't be portable between any two c

My uses of mmap have only over been memoization. Where I didn't care about byte order, and instead just assumed the files wouldn't be portable between any two computers. If you are going zero copy, you either need to give up on any kind of portability, or delve deep into compiler flags to standardize struct layout.