C / C++ / MFC

class A   
{
    int val;
public:
    A() { val = 0; }
    A(int j) { val = j; }

    int aFun(int k) {val -= k; return val; }
};

typedef int (* func)(int );
class B
{
    func m_addr;
public:
    B(func param)
        : m_addr(param)
    {

    }
    void execute()
    {
        cout << m_addr(9) << endl;
    }
};

/* error C2355: 'this' : can only be referenced inside non-static member functions error C2064: term does not evaluate to a function taking 1 arguments class does not define an 'operator()' or a user defined conversion operator to a pointer-to-function or reference-to-function that takes appropriate number of arguments */
A a;
B b(A::aFun); 
b.execute();

void CSpecimenLoadingDialog::OnItemchangingLoadingValues(NMHDR* pNMHDR, LRESULT* pResult) 
{
	NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;
	int nCheckedItems = 0;
	for(int i = 0; i < m_loadingVals.GetItemCount(); i++)
	{
		BOOL bState = ListView_GetCheckState(m_loadingVals.m_hWnd, i);
		if(bState)
		{
			nCheckedItems++;
		}
	}

	if(nCheckedItems == 2)
	{
		ListView_SetItemState(m_loadingVals.m_hWnd, pNMListView->iItem, FALSE, LVIS_STATEIMAGEMASK);
	}

	*pResult = 0;
}