[PATCH] New KFileItem::assign() for Optimizing KDirListerCache

Michael Brade brade at kde.org
Fri Mar 25 15:07:34 GMT 2005

On Friday 25 March 2005 15:57, David Faure wrote:
> Hmm, basically all you gain is a call to assign, which isn't much, but OK.
> (the ctor call does the same job as setUDSEntry anyway)
> Similary we don't have KURL::setURL(), one has to use u = KURL( newString
> [,options] ) which also needs a ctor call and an assignment, but maybe
> you're right that we should have that, if used in loops.
I guess... currently I'm trying to time the gain of not using the new/delete 
with 30000 items but I've got a memory problem ;-}

> OTOH I just noticed that the patch removes this from refresh() - why?
> -  m_access = QString::null;
> -  m_size = (KIO::filesize_t) -1;
>    m_metaInfo = KFileMetaInfo();
> -  for ( int i = 0; i < NumFlags; i++ )
> -      m_time[i] = (time_t) -1;
Because this is done in the init() method, which is called a bit further down.

> IIRC this is needed when the permissions, size, or access times of a file
> have changed.

Michael Brade;                 KDE Developer, Student of Computer Science
  |-mail: echo brade !#|tr -d "c oh"|s\e\d 's/e/\@/2;s/$/.org/;s/bra/k/2'
  °--web: http://www.kde.org/people/michaelb.html

KDE 3: The Next Generation in Desktop Experience
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