nodestack: don't create empty base node

[model-checker.git] / nodestack.h

diff --git a/nodestack.h b/nodestack.h
index f6d3e4e36be07a0ffa0feec975181faacd283f4f..d7c13688e54898dc4fa09d0a532d8866622659a2 100644 (file)
--- a/nodestack.h
+++ b/nodestack.h
@@ -56,7 +56,7 @@ struct fairness_info {
  */
 class Node {
 public:
-       Node(ModelAction *act = NULL, Node *par = NULL, int nthreads = 2, Node *prevfairness = NULL);
+       Node(ModelAction *act, Node *par, int nthreads, Node *prevfairness);
        ~Node();
        /* return true = thread choice has already been explored */
        bool has_been_explored(thread_id_t tid) const;
@@ -171,7 +171,7 @@ private:
         * @brief the index position of the current head Node
         *
         * This index is relative to node_list. The index should point to the
-        * current head Node.
+        * current head Node. It is negative when the list is empty.
         */
        int head_idx;