public override NDArray Cast(NDArray nd, NPTypeCode dtype, bool copy)
{
if (dtype == NPTypeCode.Empty)
{
throw new ArgumentNullException(nameof(dtype));
}
NDArray clone() => new NDArray(nd.Storage.Clone());
if (nd.Shape.IsEmpty)
{
if (copy)
{
return(new NDArray(dtype));
}
nd.Storage = new UnmanagedStorage(dtype);
return(nd);
}
if (nd.Shape.IsScalar || (nd.Shape.size == 1 && nd.Shape.NDim == 1))
{
var ret = NDArray.Scalar(nd.GetAtIndex(0), dtype);
if (copy)
{
return(ret);
}
nd.Storage = ret.Storage;
return(nd);
}
if (nd.GetTypeCode == dtype)
{
//casting not needed
return(copy ? clone() : nd);
}
else
{
//casting needed
if (copy)
{
if (nd.Shape.IsSliced)
{
nd = clone();
}
return(new NDArray(new UnmanagedStorage(ArraySlice.FromMemoryBlock(nd.Array.CastTo(dtype), false), nd.Shape)));
}
else
{
var storage = nd.Shape.IsSliced ? nd.Storage.Clone() : nd.Storage;
nd.Storage = new UnmanagedStorage(ArraySlice.FromMemoryBlock(storage.InternalArray.CastTo(dtype), false), storage.Shape);
return(nd);
}
}
}