List<MyClass*> & array question

Question

Hi, Assuming a definition like this,

void CConfigTest::OnSelchangedTree(NMHDR* pNMHDR, LRESULT* pResult) 
{
    NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
    TVITEM item = pNMTreeView->itemNew;
    // find the session of the selected item
    if(item.hItem != NULL)
    {
        HTREEITEM root, parent, node;
        node = item.hItem;
        parent = m_treeSM.GetParentItem(item.hItem);
        root = m_treeSM.GetRootItem();

        while(parent != root && parent != NULL)
        {
            node = parent;
            parent = m_treeSM.GetParentItem(parent); 
        }

        MyCommand* pCmd = (MyCommand*)(m_treeSM.GetItemData(node));
                ....
                ....

I tried these statements below, but failed.

pCmd->subList[2]
(pCmd->subList)[2]

How can I get the array member values(such as subList[2]). I want to replace the value of subList[2] with other same type value. Thank you.

Answer 1

Lists do not support random access. You need to switch to another container type which does, or iterate over the list until you reach the element you want.

Answer 2

If you want to array like behavior and use the subscript operator you should use std::vector and not std::list. Then you can use it just like an array for accessing and replacing elements.