Binding a variable to the "output" of a predicate

[Andy Schmidgall]

Hello,

I'm attempting to translate some prolog code fragments from a different
version of prolog into gprolog, and I was wondering if it's possible to bind
a variable to the "output" of a predicate. I suppose it would be like
redirecting the output to a variable rather than standard out.

For example, say there's a predicate like this:

write_output(X):-
  write(X).

Normally, this would write to the screen, but I'm wondering if there's a way
to get the results into a variable. The code fragment I'm translating from
used a construct like this:

write_output(X) ~> Y

(The operator is tilde-greater-than)

Thank you,
Andy


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