Re: allocating mem using glib

[richard boaz <ivor boaz gmail com>]

well, i'm a big fan of using the interface methods as opposed to referring to elements directly.  this is unlikely to change ever in the future where GSList is concerned, but for me it's a question of practice and following consistent standards.  there are certainly other examples where the individual elements may in fact change (where this change then is handled by the interface being updated itself).  thus, no need to rewrite code to refer to the newly modified element.

g_slist_free_full() only arrived in v2.28, so when the local glib satisfies this minimum version, then this would be the way to go.

r-

On Sun, Sep 2, 2012 at 11:02 AM, Jasper St. Pierre <jstpierre mecheye net> wrote:

On Sun, Sep 2, 2012 at 5:00 AM, richard boaz <ivor boaz gmail com> wrote:
> a few things of note:
>
> you're printing the elements after you free the memory, that's not gonna
> work
>
> use (iterator = g_slist_next(iterator)) to increment; do not refer to
> (iterator->next) directly

This is the only one I don't agree with. Why?

> after you've freed the list data elements, you need to free the list itself
> as well:
> g_slist_free(items_list1);

Note that if you want to free list items at the same time, you should
use g_slist_free_full, which allows you to pass a function pointer to
free items with.

> and then reset the list pointer to NULL:
> items_list1 = NULL
>
> if your list is large, use g_slist_prepend() to add to the list, and then
> g_slist_reverse() after it's been filled.  This is much quicker.
>
> convert all your str() functions to glib equivalents: g_strdup(),
> g_strdup_printf(), g_strconcat(), etc...  This way, you can create your
> item_name data element in one statement (making it much easier to read and
> understand), instead of all the hoops you're jumping through at the moment.
>
> richard
>
>
>  // Clean up
>         for(iterator = items_list1; iterator != NULL;
> iterator=iterator->next)
>         {
>                 free(((item_data*)iterator->data)->item_name);
>                 g_free(iterator->data);
>         }
>
>         for(iterator = items_list1; iterator != NULL;
> iterator=iterator->next)
>                 print_item((item_data*)iterator->data);
>
>
> On Sun, Sep 2, 2012 at 9:44 AM, Mostafa Alshrief
> <mostafa_alshrief yahoo com> wrote:
>>
>> hi there,
>>
>> i have a question about allocating/deallocating memory using glib
>> i have created this simple app to demonstrate :
>> http://pastebin.com/kVncSgxh
>> the app creates a simple GSList list and fill it with a data structure of
>> type item_data
>>
>> at line 65 i use a loop to free mem allocated by malloc() and by g_new();
>> i really need to know if i'm allocating/deallocating memory in the correct
>> way
>>
>> _______________________________________________
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>> gtk-list gnome org
>> https://mail.gnome.org/mailman/listinfo/gtk-list
>
>
>
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--
  Jasper