Re: [gtkmm] Erasing TreeModel rows...

[Thomas Johansson <prencher prencher dk>]

On tor, 2004-02-26 at 05:05, Dennis Craven wrote:
> Hey,
> 
> I've been following the documentation and examples online and in the
> distribution. They are helpful, but a little unclear about removing rows
> from TreeModels. Here is the function that I have attempting to do the
> dirty work.
> 
> void MyTreeView::deleteRow(Glib::ustring title)
> {
>   Gtk::TreeModel::Children children = treestore->children();
> 
>   for(Gtk::TreeModel::Children::iterator iter = children.begin(); iter
> != children.end(); ++iter)
>   {
>     Gtk::TreeModel::Row row = *iter;
>     if (row[columns.m_col_name] == title) {
> 
>       ////
>       // Segfaults on this erase line. "treestore" is declared as 
>       // Glib::RefPtr<Gtk::TreeStore> treestore; 
>       // and is a protected member of the MyTreeView class.
>       ////
>       treestore->erase(iter);
>       break;
>     }
>   }
> }
> 
> When execution gets to the point of failure (the erase statement), the
> iter is in fact valid and is at correct row. I can print out information
> stored on that row, this is why I'm certain. Execution does not get
> beyond that line.
> 
> I've looked around for row removal examples, and had no luck. Anyone
> here have any pointers? 
> Thanks.
> ~djc

As least when dealing with STL containers, you just have to increase the
iter, by taking the returned iter of erase, as such:

for (<sometype>::iterator it = <instance>.begin(); it !=
<instance>.end();)
{
    if (something qualifies to be deleted) {
        it = <something>.erase(it);
    } else {
        ++it;
    }
}

-- 
Thomas Johansson <prencher prencher dk>