saving and loading objects
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Dear all, This, I guess, would be a simple question to most of you but it is not obvious to me. I have been developing a class for a while and the most recent version of the code cannot load the objects constructed using earlier versions. What should I do in this case? How to implement a class that does not have problems of backward compatibility, especially in the presence of hidden, private and protected attributes? How to safeguard against attributes name changes, etc.? Is it a good or a bad thing to have an object whose properties could be instances of objects of a totally different class?
3 个评论
Walter Roberson
2013-8-21
When you say "whose properties could be instances of objects of a totally different class", do you mean property in the sense of addprop() ?
Patrick Mboma
2013-8-21
per isakson
2013-8-22
编辑：per isakson
2013-8-22
" Is it a good or a bad thing to have an object whose properties could be instances of objects of a totally different class?" It is good; it is the way to implement aggregation and composition. One cannot do without it.
"How to implement a class that does not have problems of backward compatibility" I wouldn't even try; I think that would impose too large restrictions on the design.
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2013-8-20
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