/// <summary>
/// 从列表尾部获取一个闲置的单元，如果不存在则创建一个新的
/// </summary>
/// <returns>闲置单元</returns>
public TT GetIdleUnit <TT>() where TT : T
{
TT unit = null;
if (idleList.Count > 0)
{
while (idleList.Count > 0 && idleList[idleList.Count - 1] == null)
{
idleList.RemoveAt(idleList.Count - 1);
}
if (idleList.Count > 0)
{
unit = (TT)idleList[idleList.Count - 1];
idleList.RemoveAt(idleList.Count - 1);
}
}
if (unit == null)
{
unit = CreateNewUnit <TT>();
unit.SetParentList(this);
m_createdNum++;
}
workList.Add(unit);
unit.unitStatu = PoolUnitStatuType.Work;
OnUnitChangePool(unit);
return(unit);
}