二叉树的镜像

void Mirror(BinaryTreeNode* pHead)
{
if ( pHead == NULL || ( pHead->m_pLeft == NULL && pHead->m_pRight == NULL ))
{
return;
}
else
{
BinaryTreeNode* pTemp = pHead->m_pRight ;
pHead->m_pRight = pHead->m_pLeft ;
pHead->m_pLeft = pTemp ;
}
Mirror(pHead->m_pLeft);
Mirror(pHead->m_pRight);
}