Hi Christoph! On Monday 28 Dec 2009 13:11:17 Christoph Friedrich wrote: > My Big Problem is that I must copy an object to do a backtracking method > (I am going to develop a sudoku solver). >
Well, you can always deep copy the object state, if you are sure it is self- contained. (Using Storable's dclone() or whatever.). Moreover, I should note that there are plenty of Sudoku solvers around, including on CPAN: http://search.cpan.org/search?query=sudoku&mode=all And elsewhere: http://www.google.com/search?q=sudoku%20solver http://www.google.com/search?hl=en&q=sudoku+solver+open+source&aq=f&oq=&aqi=g1 Please consider re-using one of them. Regards, Shlomi Fish > Uri Guttman schrieb: > >>>>>> "CF" == Christoph Friedrich <christ...@christophfriedrich.de> > >>>>>> writes: > > > > CF> I have searched the internet but didn't found a good answer. > > CF> How do I clone a Perl Object? > > > > CF> For example like this: > > > > CF> $a = My::Object->new(); > > CF> $b = $a->clone(); > > > > the answer is you can't in the general case. only the class should be > > able to clone an object as it knows the implementation. you can't just > > do a deep copy if it is implemented with inside out objects or other > > stuff that won't allow external code to inspect it. > > > > the only solutions are use a class that supports its own cloning method > > or get all the data out of the object with accessor calls and construct > > a new object from that. > > > > and i bet you really don't need this but you just think you do. explain > > what your bigger problem is and with what particular classes. cloning > > isn't a general need in most designs. > > > > uri > -- ----------------------------------------------------------------- Shlomi Fish http://www.shlomifish.org/ Funny Anti-Terrorism Story - http://shlom.in/enemy Bzr is slower than Subversion in combination with Sourceforge. ( By: http://dazjorz.com/ ) -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
