Be wary of using class construction and destructor to do resource allocation release, use of temporary variables

There is a class

Class Cmiregularpath
{public
:
    cmiregularpath (LPCTSTR lppath);
    ~cmiregularpath ();

    operator LPCTSTR ();
    operator LPTSTR ();

Protected:
    LPTSTR M_lppathbuffer;
    LPCTSTR M_lppath;
    LPCTSTR m_lppathregular;
};

Here is the call to

void Func1 (LPTSTR lppointer)
{

}

void Func2 (LPCTSTR lppointer)
{

}

void Test
{
    func1 (Cmiregularpath) (_t ("D:\\aa/as"));
    Func2 (Cmiregularpath) (_t ("D:\\aa/as"));
    LPTSTR lpP1 = Cmiregularpath (_t ("D:\\aa/as"));
    LPCTSTR lpP2 = Cmiregularpath (_t ("D:\\aa/as"));

The truth

The first two calls in the test function are correct, the right string is available in func1 and Func2, the latter two are wrong, the class destructor is executed immediately after the line is executed, so LPP1,LPP2 does not point to the true string.