Re: (Easy?) Newbie enquiry re: pointers

["Samuel Cormier-Iijima" <sciyoshi gmail com>]

Yea, I wasn't sure whether to put a :-( or a :-)   ( :-) ). The thing
is, strings getting copied around so often seems like memory waste to
me... when it passes the text to Pango, does that keep a pointer
itself? freetype? how many times is the same text kept multiple times
in memory? i guess for strings it doesnt really matter because it's
not that much memory wasted. Still, gnome/gtk's memory usage seems
pretty high (see ReducingMemoryUsage on the wiki)

Samuel

On 10/10/06, David Nečas (Yeti) <yeti physics muni cz> wrote:
> On Tue, Oct 10, 2006 at 01:58:20PM -0400, Samuel Cormier-Iijima wrote:
> > Whenever you set the text, the widgets will keep copies of the text
> > for themselves. (they duplicated the string so it's not showing the
> > actual contents of *your* string). To update it, you'll have to set
> > the text again for the widgets. :-(
>
> Correct, although the :-( is rather misplaced, because this
> is a *good* thing.
>
> Consider the widget just takes your string.  It still
> doesn't know you are modifying the contents so you still
> have to use some sort of explicit notification.  Not
> speaking about changes in length that require memory
> reallocation.  Not speaking about locking when some widget's
> function could be executed while you are modifying the
> string...
>
> In other words, plain C strings typically have only one
> owner (at any time point) who can modify it and who is
> responsible for freeing the string because other approaches
> are hard to get right.  The ownwer is either you or the
> widget, not both.
>
> Yeti
>
>
> --
> Whatever.
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