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mention the format("~s", [Ls]) pattern and new library(pio) predicates

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Markus Triska
2021-11-16 18:20:58 +01:00
parent 75b01d5021
commit 23df16ecf9
1 changed files with 6 additions and 1 deletions
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src/lib/format.pl
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@@ -56,7 +56,12 @@
If at all possible, format_//2 should be used, to stress pure parts If at all possible, format_//2 should be used, to stress pure parts
that enable easy testing etc. If necessary, you can emit the list Ls that enable easy testing etc. If necessary, you can emit the list Ls
with maplist(put_char, Ls). with maplist(put_char, Ls) or, much faster, with format("~s", [Ls]).
Ideally, however, you use phrase_to_file/2 or phrase_to_stream/2
from library(pio) to write the described list directly to a file
or stream, respectively: phrase_to_stream(format_(..., [...]), S).
The advantage of this is that an ideal implementation writes
the characters as they become known, without manifesting the list.
The entire library only works if the Prolog flag double_quotes The entire library only works if the Prolog flag double_quotes
is set to chars, the default value in Scryer Prolog. This should is set to chars, the default value in Scryer Prolog. This should