clist调用find函数之后调用removeat函数出错

Question

``void CClistDlg::OnBnClickedButton3()
{
// TODO: 在此添加控件通知处理程序代码
CList point3d;
for (int i = 0; i < 10; i++)
{
point3d.AddTail(CPoint3d( i*100,i*10,i));
}
m_edit_text.Empty();

//POSITION pos = point3d.Find(CPoint3d(100,10,1));   //clist调用find时需要在clist头文件中写上运算符重载
//point3d.RemoveAt(pos);

CString s;
POSITION pos1 = point3d.GetHeadPosition();

for (int i = 0; i < 10; i++)
{
    CPoint3d point = point3d.GetNext(pos1);
    s.Format(_T("x=%d,\ty=%d,\tz=%d"), point.x, point.y,point.z);
    m_edit_text.Append(s);
    m_edit_text.Append(_T("\r\n"));
}
UpdateData(false);

}
`

#pragma once
class CPoint3d
{
public:

    int x, y, z = 0;
    CPoint3d() { };
    CPoint3d(int xpos,int ypos,int zpos) 
    {
        x = xpos;
        y = ypos;
        z = zpos;
    };
    bool operator==(CPoint3d point)const
    {
        return (x == point.x&&y == point.y&&z == point.z);
    }
};

如图所示，如果在代码中 //POSITION pos = point3d.Find(CPoint3d(100,10,1)); //clist调用find时需要在clist头文件中写上运算符重载
//point3d.RemoveAt(pos);不屏蔽这两行就会报错，求大佬解释下原因
貌似并不是没检索到的问题
point3d.SetAt(pos,CPoint3d(999,99,9));如果使用setat函数则不会报错，并且程序执行正常

Answer 1

调试看看pos是不是无效的索引。