Thanks Travis. Do I understand correctly that the only way to be really safe is to make a copy and not to export a reference to it? Because anybody having a reference to the owner of the data can override the flag?
Cheers, Martin On Wednesday 20 September 2006 20:18, Travis Oliphant wrote: > Martin Wiechert wrote: > > Hi list, > > > > I just stumbled accross NPY_WRITEABLE flag. > > Now I'd like to know if there are ways either from Python or C to make an > > array temporarily immutable. > > Just setting the flag > > Python: > > make immutable: > a.flags.writeable = False > > make mutable again: > a.flags.writeable = True > > > C: > > make immutable: > a->flags &= ~NPY_WRITEABLE > > make mutable again: > a->flags |= NPY_WRITEABLE > > > In C you can play with immutability all you want. In Python you can > only make something writeable if you either 1) own the data or 2) the > object that owns the data is itself "writeable" > > > -Travis > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your opinions on IT & business topics through brief surveys -- and earn > cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/numpy-discussion ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
