1. Record example - Part II
- Posted by Daniel Berstein <daber at PAIR.COM> Feb 03, 1999
- 358 views
Following my last post about my ideas of records: A record *is* a sequence. A "frozen" sequence as Tor Bernhard Gausen said ;) The record definition declares the general form (or template) of a variable of this type. Example: record Author sequence FistName sequence MiddleName sequence lastName end record record Book sequence ISBN sequence Title sequence of Author integer Pages integer Year sequence Publisher sequence Summary atom Price end record Author new_author sequence Books of Book new_author ==> { sequence , sequence , sequence } ==> { "", "" , ""} Books ==> { { sequence , sequence , { Author }, integer , integer , sequence , sequence, atom} } ==> { { "" , "" , { { "" , "" , "" } } , 0 , 0 , "" , "" , 0.0 } } I've supposed as default values for sequences (""), integers (0) and atoms (0.0). A "default" keyword, or a simple assign (=) can allow to set the default value: record Author sequence FistName default "John" sequence MiddleName default "" sequence lastName "Smith" end record Author new_author new_author == { "Jhon", "" , "Smith"} This "merges" my opinion about records (structures) and templates. Regards, Daniel Berstein daber at pair.com