Is the following code correct inside a method?
int[] a = { 1, 2, 3, 4, 5 };
unsafe
{
fixed (int* p = &a[0])
{
p[1] = 3;
}
}
It has no errors but since a[0] is fixed and a[1] is not fixed explicitly, there may be some GC memory move for a[1].
How about this one?:
int[] a = { 1, 2, 3, 4, 5 };
unsafe
{
fixed (int* p = &a[1])
{
p[0] = 3;
}
}
Both the following assigns the address of the first element in array arr to pointer p.
fixed (double* p = arr)
is the same as
fixed (double* p = &arr[0])
in your case you assign the second element to a pointer
fixed (double* p = &arr[1])
In any case the array is pinned and protected from moving.
The variable you pin is a. It's managed as a single allocation. Individual array elements will never be relocated, only the array as a whole.
Depending on your needs, you might consider using stackalloc instead to allocate memory on the stack rather than on the heap. Variables on the stack are not subject to GC and therefore do not need to be pinned.
