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/********************* */
/*! \file cdqueue.h
** \verbatim
** Original author: taking
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Context-dependent queue class
**
** 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 very simple.
**/
#include "cvc4_private.h"
#ifndef __CVC4__CONTEXT__CDQUEUE_H
#define __CVC4__CONTEXT__CDQUEUE_H
#include "context/context.h"
#include "context/cdlist.h"
namespace CVC4 {
namespace context {
template <class T>
class CDQueue {
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 CDQueue associated with the current context. */
CDQueue(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. */
void enqueue(const T& data){
d_list.push_back(data);
}
/** Returns a reference to the next element on the queue. */
const T& dequeue(){
Assert(!empty(), "Attempting to queue from an empty queue.");
size_t front = d_iter;
d_iter = d_iter + 1;
return d_list[front];
}
};/* class CDQueue<> */
}/* CVC4::context namespace */
}/* CVC4 namespace */
#endif /* __CVC4__CONTEXT__CDQUEUE_H */
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