static void SubViewAccess(ArrayView <int> view)
{
// Creates a sub view that represents a view from index 10 to view.Length - 1
var subView = view.SubView(10);
Debug.Assert(subView.Length == view.Length - 10);
// Write value to sub view and output value
subView[0] = 42;
Console.WriteLine($"Value of sub view at index 0: {subView[0]} = value of view at index 10: {view[10]}");
// Creates a sub view that represents a view from index 10 with length 20
// (up to index 10 + 20)
var subView2 = view.SubView(10, 20);
Debug.Assert(subView2.Length == 20);
Console.WriteLine($"Value of sub view 2 at index 0: {subView2[0]} = value of view at index 10: {view[10]}");
// Creates a sub view that represents a view from index 20 with length 2
var subView3 = subView2.SubView(10, 2);
subView3[1] = 23;
// An access of the form subView3[2] will trigger an OutOfBounds assertion
Debug.Assert(subView3.Length == 2);
Console.WriteLine($"Value of sub view 3 at index 1: {subView3[1]} = value of view at index 21: {view[21]}");
}
static void OffsetCopyAccess(ArrayView <int> view)
{
// Replace the first 256 items on the accelerator with the value 42.
var replacementValues = Enumerable.Repeat(42, 256).ToArray();
view.SubView(0, replacementValues.Length).CopyFromCPU(replacementValues);
// Replace the next 256 items on the accelerator with the value 97.
var nextReplacementValues = Enumerable.Repeat(97, 256).ToArray();
view.SubView(256, nextReplacementValues.Length).CopyFromCPU(nextReplacementValues);
// Copy a range of values from the accelerator to the CPU into a new array.
var fromGPU = view.SubView(128, 256).GetAsArray();
// Copy a range of values from the accelerator to the CPU into an existing array.
view.SubView(0, 128).CopyToCPU(fromGPU.AsSpan().Slice(128));
}
internal static void ArrayViewGetSubViewImplicitLengthKernel(
Index1D index,
ArrayView1D <int, Stride1D.Dense> length,
ArrayView1D <int, Stride1D.Dense> source,
int subViewOffset)
{
ArrayView <int> rawView = source;
var subView = rawView.SubView(subViewOffset);
length[index] = subView.IntLength;
}
