Hi Oleg, If there as a class to inherit from, then my point about an S4 class requiring lots of methods is moot. I think it would come down then to whether one prefers flexibility (advantage S3) or a definite structure for use with C/C++ (advantage S4).
Tim >well, I am not arguing that there are situation when one needs to >rewrite everything from scratch. However it is always worth at least >considering inheritance if there is a candidate to inherit from. It >saves a lot of work. > >Anyway, your examples of S3 class usage are obviously valid in sense >that they are indeed S3 methods providing desired functionality. >However, I still do not see WHY using attributes with S3 is better than >slots and S4 for structures like those inherited from 'array' or >similar. S3 gives more freedom in assigning new attributes, but this >freedom also means that one has little control over the structure of an >object making it, for example, more difficult to use with C/C++ code. >Are there any specific benefits in not using S4 and slots (apart from >some known performance issues)? ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
