On Tue, 2006-12-05 at 02:13 -0800, Erick Tryzelaar wrote: > Maybe I miswrote the function. It's supposed to say that you can swap > the values the iterator points two. > > > Whether the value they point at are swappable depends on whether > > the iterator types are Writable_iterator's (in your classification). > > You can always implement swap using a temporary in that case .. > > so swap method should probably be added to Writable_iterator, > > in case there is a more efficient way to do it. > The iterators need to be readable as well, as the Writable_iterator > ought to provide no mechanism for pulling data out of the iterator.
Yes, that's true. > For > instance, a "cout" style iterator can't access the data you write into > it, as it's already written across the stream. However, I didn't inherit > Writable_iterator and Readable_iterator in case there was an > instance-specific way to do the swapping. I did provide a generic > Swappable that provides the generic case (tmp-swap), but I'm not sure if > that would actually work. Perhaps there should be a typeclass ReadWrite_iterator that inherits from both Readable_ and Writable_iterator? -- John Skaller <skaller at users dot sf dot net> Felix, successor to C++: http://felix.sf.net ------------------------------------------------------------------------- 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 _______________________________________________ Felix-language mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/felix-language
