Fixed pattern, and offset from start address.

[zugolbr]

Hi,
From the documentation I could find about the fixed pattern, I could not tell if ref ... GetPinnableReference() should always return the element at the very beginning of the memory zone to be fixed, or if it was safe to use an offset (as long as it does not overflow, of course).

Example:

        class FixedPatternTest
        {
            byte[] _Array = new byte[93];

            public Int32 Offset { get; set; }

            public ref byte GetPinnableReference()
            {
                return ref _Array[Offset];
            }
        }

        static unsafe void Main(string[] args)
        {
            FixedPatternTest test = new FixedPatternTest();

            test.Offset = 46;
            fixed (byte* p = test)
            {
                *p = 39;
            }
        }

Thanks...

[huoyaoyuan]

byte[] array = new byte[93];
Span<byte> span = array.AsSpan(46);
fixed (byte * p = span)
{

}

obviously, the reference is at the middle of the array.

[zugolbr]

You're right, that's a good hint that this is safe!
Thanks! :)