namespace System.Runtime.InteropServices.Marshalling
{
    [CLSCompliant(false)]
    [ContiguousCollectionMarshaller]
    [CustomMarshaller(typeof(GenericPlaceholder[]), MarshalMode.Default, typeof(ArrayMarshaller<?, ?>))]
    [CustomMarshaller(typeof(GenericPlaceholder[]), MarshalMode.ManagedToUnmanagedIn, typeof(ManagedToUnmanagedIn))]
    public static class ArrayMarshaller<T, TUnmanagedElement>
        where TUnmanagedElement, unmanaged, struct
    {
        public static TUnmanagedElement* AllocateContainerForUnmanagedElements(T[]? managed, out int numElements);
    }
}