/// <summary>
/// Makes the chain relationship between two transits.
/// </summary>
/// <param name="transit">The chain transit object. This transit will be operated after the transit is done.</param>
void AddChainedTransit(Transit transit)
{
if (_checker.Contains(transit))
{
throw new InvalidOperationException("Cannot add the duplicate transit.");
}
_checker.Add(transit);
Interop.Elementary.elm_transit_chain_transit_add(_handle, transit._handle);
}