portray/1

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Predicate portray/1

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Source

portray(+Term)

A dynamic predicate, which can be defined by the user to change the behaviour of print/1 on (sub)terms. For each subterm encountered that is not a variable print/1 first calls portray/1 using the term as argument. For lists, only the list as a whole is given to portray/1. If portray/1 succeeds print/1 assumes the term has been written.