Re: Do TreeIters persist after foreach search ?

["muppet" <scott asofyet org>]

Dave Howorth wrote:
> I think there must be something I'm overlooking about iters. I have code
> which for testing I've simplified to the following:
>
>     my $match_iter;
>     $tree_store->foreach(
>         sub {
>             my ($tree_store, $path, $iter) = @_;
>
>             my $level = $tree_store->get($iter, LEVEL);
>             warn "  tree_store=$tree_store, iter=$iter;\n";
>
>             $match_iter = $iter;
>             return TRUE;
>         });
>
>     warn "search $tree_store => $match_iter;\n";
>     my $level = $tree_store->get($match_iter, LEVEL);


The iters are intended to be used on the stack in C, so for a foreach(), they
would be destroyed before returning from the foreach() call.

Instead, either store the $path or, better yet, the data from the row that you
found, like this:

    my $row_data;
    $tree_store->foreach(
        sub {
            my ($tree_store, $path, $iter) = @_;
            my $this_row = [ $tree_store->get ($iter) ];
            if (this_row_is_the_one_i_want ($this_row)) {
                $row_data = $this_row;
                return TRUE;
            }
            return FALSE;
        });
    if (defined $row_data) {
        ...
    }

Alternatively, you could just call the i-found-it-action in the foreach
callback when you find the row you want, and avoid the issue.