if else 用法if(m_Rgn==NULL){\x05 m_Rgn=new CRgn; }else m_Rgn->DeleteObject();////////////请问这里怎么理解?{CPoint point[4];CPoint FirstPoint;CPoint SecondPoint;...}

if else 用法
if(m_Rgn==NULL)
{
\x05 m_Rgn=new CRgn;
}
else m_Rgn->DeleteObject();////////////请问这里怎么理解?
{
CPoint point[4];
CPoint FirstPoint;
CPoint SecondPoint;
.
.
.
}

m_Rgn->DeleteObject 根据它的返回值来决定是否执行吧.