John Levon wrote: >On Fri, Dec 14, 2001 at 02:07:05PM +1100, Ben Stanley wrote: > >>John Leveon asked me how you would specify that one kind of inset is >>searchable but not spell-checkable, and that another kind of inset is >>spell-checkable and not searchable. Here is a complete self-contained >>example. >> > >OK, I get it now, the method lookup does the type inspection via the parameter type >matching. > Uh, by the function name, but could name them all the same and do it by parameter type. The type lookup is really by the virtual Accept function in all the insets.
>That was the crucial point I was missing :) > >And I like it, I think. Not sure about the other example though ... > Oh, didn't you like it? The contents of the visitor's methods would be pretty much the same as the current WriteAsText (or equivalent) methods dotted all over the Inset code... It just collects it all into one place. And where the WriteAsText method would call a sub-inset's WriteAsText method to get it to write itself out, the Visitor's method would call inset.Accept(*this); to do the same thing and correctly virtually dispatch it. Then all the WriteAsText code is collected into one file, all together, easier to maintain and make sure it's all consistent. Ben.
