4.17.4 Switching between Edinburgh and ISO I/O

The predicates below can be used for switching between the implicit and the explicit stream-based I/O predicates.

[ISO]set_input(+Stream)

Set the current input stream to become Stream. Thus, open(file, read, Stream), set_input(Stream) is equivalent to see(file).

[ISO]set_output(+Stream)

Set the current output stream to become Stream. See also with_output_to/2.

[ISO]current_input(-Stream)

Get the current input stream. Useful for getting access to the status predicates associated with streams.

[ISO]current_output(-Stream)

Get the current output stream.