nodestack: add Node::get_parent() function

[model-checker.git] / nodestack.cc

diff --git a/nodestack.cc b/nodestack.cc
index 87b3ee531fbe2d10a7b52f229f23e7ea90196e9d..e7b5f51162b485160f3b4bb20cb06f13df2dc3b6 100644 (file)
--- a/nodestack.cc
+++ b/nodestack.cc
@@ -4,8 +4,9 @@
 #include "model.h"
 
 /** @brief Node constructor */
-Node::Node(ModelAction *act, int nthreads)
+Node::Node(ModelAction *act, Node *par, int nthreads)
        : action(act),
+       parent(par),
        num_threads(nthreads),
        explored_children(num_threads),
        backtrack(num_threads),
@@ -173,7 +174,7 @@ ModelAction * NodeStack::explore_action(ModelAction *act)
 
        /* Record action */
        get_head()->explore_child(act);
-       node_list.push_back(new Node(act, model->get_num_threads()));
+       node_list.push_back(new Node(act, get_head(), model->get_num_threads()));
        total_nodes++;
        iter++;
        return NULL;