public MarketDepth(MarketDepth rhs)
{
RateUnits = rhs.RateUnits;
Q2B = new OrderBook(rhs.Q2B);
B2Q = new OrderBook(rhs.B2Q);
}
public OrderBook(OrderBook rhs)
: this(rhs.Base, rhs.Quote, rhs.TradeType)
{
Offers.Assign(rhs.Offers);
}