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/********************* */
/*! \file cdtrail_queue.h
** \verbatim
** Top contributors (to current version):
** Tim King
** This file is part of the CVC4 project.
** Copyright (c) 2009-2019 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 Context-dependent queue class with an explicit trail of elements
**
** Context-dependent First-In-First-Out queue class.
** The implementation is based on a combination of CDList and a CDO<size_t>
** for tracking the next element to dequeue from the list.
** The implementation is currently not full featured.
**/
#include "cvc4_private.h"
#ifndef CVC4__CONTEXT__CDTRAIL_QUEUE_H
#define CVC4__CONTEXT__CDTRAIL_QUEUE_H
#include "context/context.h"
#include "context/cdlist.h"
namespace CVC4 {
namespace context {
template <class T>
class CDTrailQueue {
private:
/** List of elements in the queue. */
CDList<T> d_list;
/** Points to the next element in the current context to dequeue. */
CDO<size_t> d_iter;
public:
/** Creates a new CDTrailQueue associated with the current context. */
CDTrailQueue(Context* context)
: d_list(context),
d_iter(context, 0)
{}
/** Returns true if the queue is empty in the current context. */
bool empty() const{
return d_iter >= d_list.size();
}
/**
* Enqueues an element in the current context.
* Returns its index in the queue.
*/
size_t enqueue(const T& data){
size_t res = d_list.size();
d_list.push_back(data);
return res;
}
size_t frontIndex() const{
return d_iter;
}
const T& front() const{
return d_list[frontIndex()];
}
/** Moves the iterator for the queue forward. */
void dequeue(){
Assert(!empty(), "Attempting to queue from an empty queue.");
d_iter = d_iter + 1;
}
const T& operator[](size_t index) const{
Assert(index < d_list.size());
return d_list[index];
}
size_t size() const{
return d_list.size();
}
};/* class CDTrailQueue<> */
}/* CVC4::context namespace */
}/* CVC4 namespace */
#endif /* CVC4__CONTEXT__CDTRAIL_QUEUE_H */
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