#include <sicstus/sicstus.h> int SP_query(SP_pred_ref predicate, SP_term_ref arg1, ...);
Calls a predicate, committing to its first solution.
SP_SUCCESS if the goal succeeded,
SP_FAILURE if it failed, and
SP_ERROR if an error condition occurred.
Use this if you are only interested in the first solution. It will
create a goal from the
predicate definition and the arguments, call it, and commit to the
first solution found, if any. If it returns
SP_SUCCESS, values in the
query arguments valid, and will remain so until
backtracking into any enclosing query.
Finding One Solution of a Call.