On 11/19/2015 12:00 PM, Martin Baker wrote: > print(a:CoercibleTo(OutputForm),b:CoercibleTo(OutputForm)):Void == > print hconcat([a::OutputForm,b::OutputForm])$OutputForm
As you can see here https://github.com/hemmecke/fricas/blob/master-hemmecke/src/algebra//coerce.spad#L9 CoercibleTo(...) is a category. When I interpret your code then I would say that a is a *domain* that provides a function coerce: a -> OutputForm, i.e. any element of a can be coerced into an OutputForm, but not a itself. You probably want something like this: --------------- printUtil(A: CoercibleTo OutputForm) : Exports == Implementation where Exports ==> with print : (a: A, b: A) -> Void ++ print 2 arguments Implementation ==> add print(a: A, b: A):Void == print hconcat(a::OutputForm, b::OutputForm)$OutputForm --------------- But I guess, even that is not in your mind. Maybe you add "B: CoercibleTo(OutputForm)" as a second parameter of the package. Well, it becomes a bit cumbersome then. Do you really need it in a spad file? I usually use a similar two argument print via the macro mechanism. O==>OutputForm dbgPrint(x,y) ==> print([x::O,y::O]$List(O)::O) Hope that helps. Ralf -- You received this message because you are subscribed to the Google Groups "FriCAS - computer algebra system" group. To unsubscribe from this group and stop receiving emails from it, send an email to fricas-devel+unsubscr...@googlegroups.com. To post to this group, send email to fricas-devel@googlegroups.com. Visit this group at http://groups.google.com/group/fricas-devel. For more options, visit https://groups.google.com/d/optout.
