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diff --git a/src/context/cdvector.h b/src/context/cdvector.h
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--- a/src/context/cdvector.h
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@@ -1,162 +0,0 @@
-/*********************                                                        */
-/*! \file cdvector.h
- ** \verbatim
- ** Top contributors (to current version):
- **   Tim King, Morgan Deters
- ** This file is part of the CVC4 project.
- ** Copyright (c) 2009-2018 by the authors listed in the file AUTHORS
- ** in the top-level source directory) and their institutional affiliations.
- ** All rights reserved.  See the file COPYING in the top-level source
- ** directory for licensing information.\endverbatim
- **
- ** \brief [[ Add one-line brief description here ]]
- **
- ** [[ Add lengthier description here ]]
- ** \todo document this file
- **/
-
-#include "cvc4_private.h"
-
-#ifndef __CVC4__CONTEXT__CDVECTOR_H
-#define __CVC4__CONTEXT__CDVECTOR_H
-
-#include <vector>
-
-#include "base/cvc4_assert.h"
-#include "context/context.h"
-#include "context/cdlist.h"
-
-namespace CVC4 {
-namespace context {
-
-
-/**
- * Generic context-dependent dynamic vector.
- * This is quite different than CDList<T>.
- * It provides the ability to destructively update the i'th item.
- *
- * The back of the vector may only be popped if there have been no updates to it
- * at this context level.
- */
-template <class T>
-class CDVector {
-private:
-  static const int ImpossibleLevel = -1;
-
-  struct UpdatableElement {
-  public:
-    T d_data;
-    int d_contextLevelOfLastUpdate;
-
-    UpdatableElement(const T& data) :
-      d_data(data),
-      d_contextLevelOfLastUpdate(ImpossibleLevel) {
-    }
-  };/* struct CDVector<T>::UpdatableElement */
-
-  struct HistoryElement {
-  public:
-    UpdatableElement d_cached;
-    size_t d_index;
-    HistoryElement(const UpdatableElement& cache, size_t index) :
-      d_cached(cache), d_index(index) {
-    }
-  };/* struct CDVector<T>::HistoryElement */
-
-  typedef std::vector< UpdatableElement > CurrentVector;
-  CurrentVector d_current;
-
-
-
-  class HistoryListCleanUp{
-  private:
-    CurrentVector& d_current;
-  public:
-    HistoryListCleanUp(CurrentVector& current)
-      : d_current(current)
-    {}
-
-    void operator()(HistoryElement* back){
-      d_current[back->d_index] = back->d_cached;
-    }
-  };/* class CDVector<T>::HistoryListCleanUp */
-
-  typedef CDList< HistoryElement,  HistoryListCleanUp > HistoryVector;
-  HistoryVector d_history;
-
-  Context* d_context;
-
-  // no copy or assignment
-  CDVector(const CDVector&) CVC4_UNDEFINED;
-  CDVector& operator=(const CDVector&) CVC4_UNDEFINED;
-
-public:
-  CDVector(Context* c) :
-    d_current(),
-    d_history(c, true, HistoryListCleanUp(d_current)),
-    d_context(c)
-  {}
-
-  size_t size() const {
-    return d_current.size();
-  }
-
-  /**
-   * Return true iff there are no valid objects in the list.
-   */
-  bool empty() const {
-    return d_current.empty();
-  }
-
-  /**
-   * Add an item to the end of the list.
-   * Assigns its state at level 0 to be equal to data.
-   */
-  void push_back(const T& data) {
-    d_current.push_back(UpdatableElement(data));
-  }
-
-  /**
-   * Access to the ith item in the list.
-   */
-  const T& operator[](size_t i) const {
-    return get(i);
-  }
-
-  const T& get(size_t i) const {
-    Assert(i < size(), "index out of bounds in CDVector::get()");
-    //makeConsistent();
-    return d_current[i].d_data;
-  }
-
-  void set(size_t index, const T& data) {
-    Assert(index < size(), "index out of bounds in CDVector::set()");
-    //makeConsistent();
-
-    if(d_current[index].d_contextLevelOfLastUpdate == d_context->getLevel()) {
-      d_current[index].d_data = data;
-    }else{
-      d_history.push_back(HistoryElement(d_current[index], index));
-
-      d_current[index].d_data = data;
-      d_current[index].d_contextLevelOfLastUpdate = d_context->getLevel();
-    }
-  }
-
-  bool hasUpdates(size_t index) const {
-    Assert(index < size(), "index out of bounds in CDVector::hasUpdates()");
-    return d_current[index].d_contextLevelOfLastUpdate == ImpossibleLevel;
-  }
-
-  void pop_back() {
-    Assert(!empty(), "pop_back() on an empty CDVector");
-    Assert(!hasUpdates(size() - 1), "popping an element with updates.");
-    d_current.pop_back();
-  }
-
-};/* class CDVector<T> */
-
-}/* CVC4::context namespace */
-}/* CVC4 namespace */
-
-#endif /* __CVC4__CONTEXT__CDVECTOR_H */