+/* Copyright (c) 2007-2023. The SimGrid Team. All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#ifndef SIMGRID_MC_ODPOR_WAKEUP_TREE_HPP
+#define SIMGRID_MC_ODPOR_WAKEUP_TREE_HPP
+
+#include "src/mc/explo/odpor/odpor_forward.hpp"
+
+#include <memory>
+#include <unordered_map>
+
+namespace simgrid::mc::odpor {
+
+class WakeupTreeNode {
+private:
+ /** An ordered list of children of for this node in the tree */
+ std::list<const WakeupTreeNode*> children_;
+
+ /** @brief The contents of the node */
+ ProcessSequence seq_;
+
+public:
+ const auto begin() const { return this->children_.begin(); }
+ const auto end() const { return this->children_.end(); }
+ const auto rbegin() const { return this->children_.rbegin(); }
+ const auto rend() const { return this->children_.rend(); }
+
+ const ProcessSequence& get_sequence() const { return seq_; }
+ const std::list<const WakeupTreeNode*>& get_ordered_children() const { return children_; }
+
+ bool is_leaf() const { return children_.empty(); }
+};
+
+class WakeupTree {
+private:
+ /** @brief The root node of the tree */
+ const WakeupTreeNode* const root;
+
+ /**
+ * @brief All of the nodes that are currently are a part of the tree
+ *
+ * @invariant Each node event maps itself to the owner of that node,
+ * i.e. the unique pointer that manages the data at the address. The tree owns all
+ * of the addresses that are referenced by the nodes WakeupTreeNode and Configuration.
+ * ODPOR guarantees that nodes are persisted as long as needed.
+ */
+ std::unordered_map<const WakeupTreeNode*, std::unique_ptr<WakeupTreeNode>> nodes_;
+
+ /* Allow the iterator to access the contents of the tree */
+ friend WakeupTreeIterator;
+
+public:
+ WakeupTree();
+
+ /**
+ * @brief Inserts an sequence `seq` of processes into the tree
+ * such that that this tree is a wakeup tree relative to the
+ * given execution
+ */
+ void insert(const Execution&, const ExecutionSequence& seq);
+};
+
+} // namespace simgrid::mc::odpor
+#endif
