internal Subscription(UnmanagedSliceBuilderPool pool, UnmanagedSliceBuilder builder)
 {
     Contract.Requires(pool != null && builder != null);
     m_pool    = pool;
     m_builder = builder;
 }
			internal Subscription(UnmanagedSliceBuilderPool pool, UnmanagedSliceBuilder builder)
			{
				Contract.Requires(pool != null && builder != null);
				m_pool = pool;
				m_builder = builder;
			}