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/* Centre for Speech Technology Research */
/* University of Edinburgh, UK */
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#ifndef __EST_TDEQUE_H__
#define __EST_TDEQUE_H__
#include "EST_TVector.h"
#include "instantiate/EST_TDequeI.h"
/** @class EST_TDeque
* @brief Double ended queue.
* @ingroup containerclasses
*
* @author Richard Caley <rjc@cstr.ed.ac.uk>
* @version $Id: EST_TDeque.h,v 1.3 2006/07/19 21:52:12 awb Exp $
*/
template <class T>
class EST_TDeque {
private:
EST_TVector<T> p_vector;
int p_increment;
int p_back;
int p_front;
// Make the structure bigger.
void expand(void);
public:
EST_TDeque(unsigned int capacity, unsigned int increment);
EST_TDeque(unsigned int capacity);
EST_TDeque(void);
/// Used to fill empty spaces when possible.
static const T *Filler;
/// Empty it out.
void clear(void);
/// Is there anything to get?
bool is_empty(void) const;
/// print picture of state. Mostly useful for debugging.
ostream &print(ostream &s) const;
/**@name stack
*
* An interface looking like a stack.
*/
///@{
void push(T &item);
T &pop(void);
T &nth(int i);
///@}
/**@name inverse stack
*
* The other end as a stack.
*/
///@{
void back_push(T& item);
T &back_pop(void);
///@}
/**@name queue
*
* An interface looking like a queue.
*/
///@{
void add(T& item) { push(item); }
T &next() { return back_pop(); }
T &last() { return pop(); }
///@}
/**@name perl
*
* For people who think in perl
*/
///@{
void unshift(T& item) { back_push(item); }
T &shift() { return back_pop(); }
///@}
friend ostream& operator << (ostream &st, const EST_TDeque< T > &deq)
{
return deq.print(st);
}
};
#endif
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