Check to see if the Class of the Object has changed and if it has, then copy the data from the old structure into the new one and delete the old.
You only lose what you don't now need. You can copy based on matching names and variable type. If you want the ability to undo the change, then log the old Object before you change it. David Clark From: Piaget Modeler [mailto:[email protected]] Sent: September-06-13 12:31 PM To: AGI Subject: [agi] Module re-definitions Hi All, Just wanted to get a survey. I'm thinking about what modularity means in an interpreted language. I'm working on a new language for my research and came upon a question in modularity and interpreter design. If you have existing objects defined in memory and you load a new module which redefines the type hierarchy, what should happen? In most dialects of SQL, when adding a module (i.e. a script), say to build a database, there is code to delete an existing object before defining the new object. For example, when defining a new table, often there is code to drop the table beforehand: If ( exists(table(A))) then drop table A ; Create table A as blah blah blah... Redefinitions can obliterate existing database objects. The scripting can be controlled by the developer so that redefinitions do not destroy existing objects but rather just signal errors. In 3 GL languages like C++, Java, etc. when a code module is accidentally included twice in a source file, what exactly happens? Does the compiler redefine or ignore the functions or objects in the duplicate module? What about interpreted languages like python? Your thoughts? Michael. AGI | <https://www.listbox.com/member/archive/303/=now> Archives <https://www.listbox.com/member/archive/rss/303/1652298-7c98969f> Image removed by sender.| <https://www.listbox.com/member/?&; c> Modify Your Subscription <http://www.listbox.com> Image removed by sender. ------------------------------------------- AGI Archives: https://www.listbox.com/member/archive/303/=now RSS Feed: https://www.listbox.com/member/archive/rss/303/21088071-f452e424 Modify Your Subscription: https://www.listbox.com/member/?member_id=21088071&id_secret=21088071-58d57657 Powered by Listbox: http://www.listbox.com
<<~WRD000.jpg>>
