//change to a new state
public void ChangeState(TState <T> pNewState)
{
//keep a record of the previous state
m_pPreviousState = m_pCurrentState;
m_pNewState = pNewState; //for current state exit use
//call the exit method of the existing state
if (null != m_pCurrentState)
{
m_pCurrentState.Exit(m_pOwner);
}
//change state to the new state
m_pCurrentState = pNewState;
//call the entry method of the new state
m_pCurrentState.Enter(m_pOwner);
}