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This non-compliant example shows that ptr is aligned to an alignment of 4096 bytes where as the realloc() function aligns the memory to a different alignment.
(Assuming that the sizeof(double) = 8 and sizeof(float) = 4.)

size_t size = 16;
size_t alignment = 1<<12;
float *ptr;
double *ptr1;

ptr = aligned_alloc(align , size);
ptr1 = realloc(ptr, size);

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This compliant example checks that aligned_alloc() has the same alignment as the alignment realloc() function enforces on the memory pointed to by ptr.
(Assuming that the sizeof(double) = 8 and sizeof(float) = 4.)

size_t size = 16;
size_t alignment = 1<<12;
float *ptr;
double *ptr1;

ptr = aligned_alloc(align , size);

if(align == alignof(ptr1)) {
ptr1 = realloc(ptr, size);
}

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