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document atomic_list_concat/3 (stolen from SWI).

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Vítor Santos Costa 2010-06-18 00:30:39 +01:00
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docs/yap.tex
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@ -3437,6 +3437,29 @@ the second unifies with the atom obtained by concatenating all the
atomic terms in the first list. The first argument thus may contain atomic terms in the first list. The first argument thus may contain
atoms or numbers. atoms or numbers.
@item atomic_list_concat(?@var{As},+@var{Separator},?@var{A})
@findex atomic_list_concat/3
@snindex atomic_list_concat/3
@cnindex atomic_list_concat/3
Creates an atom just like @code{atomic_list_concat/2}, but inserts
@var{Separator} between each pair of atoms. For example:
@example
?- atomic_list_concat([gnu, gnat], ', ', A).
A = 'gnu, gnat'
@end example
YAP emulates the SWI-Prolog version of this predicate that can also be
used to split atoms by instantiating @var{Separator} and @var{Atom} as
shown below.
@example
?- atomic_list_concat(L, -, 'gnu-gnat').
L = [gnu, gnat]
@end example
@item atom_length(+@var{A},?@var{I}) [ISO] @item atom_length(+@var{A},?@var{I}) [ISO]
@findex atom_length/2 @findex atom_length/2
@snindex atom_length/2 @snindex atom_length/2