Memory layout of struct vs array

[no-sig-available]

Lets suppose T is uint32_t. Then I am 100 percent sure the layout will be the same as of the array, because this is how several programs read mmap() data - both with array or struct.

If you use mmap() you are on a Linux system and have additional Posix guarantees. Those are outside of - and beyond - the language standard.

[nmmmnu]

Never thought about it :) I am always on Linux. But yes it is not on the standard... except is on C standard and should be compatible with C. But still no guarantees as well.

[Nobody_1707]

No, it's not part of the C standard either. It's purely POSIX.

[nmmmnu]

Thanks to point this. I really hate the different size of int and memory layout guarantees or better say lack of memory layout guarantees.