Does realloc of memory allocated by C11 aligned_alloc keep the alignment?
c, c11, memory-management, realloc
Solution
The alignment is not kept with the pointer. When you call realloc you can only rely on the alignment that realloc guarantees. You'll need to use aligned_alloc to perform any reallocations.
Problem
Consider the following (C11) code: ``` void *ptr = aligned_alloc(4096, 4096); ... // do something with 'ptr' ptr = realloc(ptr, 6000); ``` Since the memory that `ptr` points to has a 4096-byte alignment from `aligned_alloc`, will it (read: is it guaranteed to) keep that alignment after a (successful) call to `realloc`? Or could the memory revert to the default alignment?