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/********************* */
/*! \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 */
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