Re: streams

Cliff Bender wrote:

>I'd like some help trying to understand the use of streams. 
>
Hurrms, not sure what is broken w/ your example, however, I tend to use 
the format construct.

    $ gprolog
    GNU Prolog 1.2.18
    By Daniel Diaz
    Copyright (C) 1999-2004 Daniel Diaz
    | ?- assertz(p(1)), assertz(p(2)).

    yes
    | ?- open('out.log', write, H), (p(X), format(H, "p(~w) ~n", [X]),
    fail; close(H)), !.

    H = '$stream'(2)

    (1 ms) yes
    | ?- system('cat out.log').
    p(1)
    p(2)

    (1 ms) yes

This explicit indication of the target stream is useful in context where 
there is more than one and it also gives you more control over what is 
sent to the stream . . .

more,
l8r,
v

-- 
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 -- William Gibson, quoted by Whitfield Diffie