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The functions from this section are intended to read a Prolog list from
C. Suppose we expect a list of atoms, the following code will print the
atoms, each on a line:
![\begin{code}
foreign_t
pl_write_atoms(term_t l)
{ term_t head = PL_new_term_ref(...
...se
PL_fail;
}
\par return PL_get_nil(list); /* test end for [] */
}
\end{code}](img142.png)
- intPL_get_listterm_t +l, term_t -h, term_t -t
If l is a list and not [] assign a term-reference to the
head to h and to the tail to t.
intPL_get_headterm_t +l, term_t -h
If l is a list and not [] assign a term-reference to the
head to h.
intPL_get_tailterm_t +l, term_t -t
If l is a list and not [] assign a term-reference to the
tail to t.
intPL_get_nilterm_t +l
Succeeds if represents the atom [].
Dr. Richard Botting
2001-12-12