Method truth_value

expr.hh:98–100

  const char *op;
  virtual void out(std::ostream &out) { out << op; }
  truth_value(prod *p) : bool_expr(p) {
    op = ( (d6() < 4) ? scope->schema->true_literal : scope->schema->false_literal);
  }
};

struct null_predicate : bool_expr {