// -----------------------------------------------------------------------------
//
//  $Logfile:: /fakk2_code/fakk2_new/fgame/stack.h                            $
// $Revision:: 2                                                              $
//   $Author:: Aldie                                                          $
//     $Date:: 7/25/00 11:32p                                                 $
//
// Copyright (C) 1997 by Ritual Entertainment, Inc.
// All rights reserved.
//
// This source is may not be distributed and/or modified without
// expressly written permission by Ritual Entertainment, Inc.
//
// $Log:: /fakk2_code/fakk2_new/fgame/stack.h                                 $
//
// 2     7/25/00 11:32p Aldie
// Made some changes to the memory system and fixed a memory allocation bug in
// Z_TagMalloc.  Also changed a lot of classes to subclass from Class.
//
// 1     9/10/99 10:54a Jimdose
//
// 1     9/08/99 3:16p Aldie
//
// DESCRIPTION:
// Generic Stack object.
//

#ifndef __STACK_H__
#define __STACK_H__

#include "g_local.h"
#include "class.h"

template <class Type>
class StackNode : public Class
{
public:
	Type      data;
	StackNode *next;

	StackNode( Type d );
};

template <class Type>
inline StackNode<Type>::StackNode( Type d ) : data( d )
{
	next = NULL;
}

template <class Type>
class Stack : public Class
{
private:
	StackNode<Type> *head;

public:
	Stack();
	~Stack<Type>();
	void Clear( void );
	qboolean Empty( void );
	void Push( Type data );
	Type Pop( void );
};

template <class Type>
inline Stack<Type>::Stack()
{
	head = NULL;
}

template <class Type>
inline Stack<Type>::~Stack<Type>()
{
	Clear();
}

template <class Type>
inline void Stack<Type>::Clear( void )
{
	while( !Empty())
	{
		Pop();
	}
}

template <class Type>
inline qboolean Stack<Type>::Empty( void )
{
	if( head == NULL )
	{
		return true;
	}
	return false;
}

template <class Type>
inline void Stack<Type>::Push( Type data )
{
	StackNode<Type> *tmp;

	tmp = new StackNode<Type>( data );
	if( !tmp )
	{
		assert( NULL );
		gi.Error( ERR_DROP, "Stack::Push : Out of memory" );
	}

	tmp->next = head;
	head = tmp;
}

template <class Type>
inline Type Stack<Type>::Pop( void )
{
	Type ret;
	StackNode<Type> *node;

	if( !head )
	{
		return NULL;
	}

	node = head;
	ret = node->data;
	head = node->next;

	delete node;

	return ret;
}

#endif /* stack.h */
