hl2_src-leak-2017/src/public/list.h

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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//
//=============================================================================//
#ifndef __LIST_H__
#define __LIST_H__
// TODO:
// GetPositionAtIndex needs to keep a cache of the previous call so
// that it doesn't do a linear search every time.
#include <stdlib.h>
// FIXME: change the name of this to something more specific.
typedef struct
{
} _Position;
typedef _Position *Position;
template <class T> class GList;
template <class T> class GListIterator;
// GListNode: Class decleration and definition
template <class T> class GListNode
{
private:
T data;
GListNode<T> *next;
GListNode<T> *prev;
GListNode();
GListNode( T item );
friend class GList<T>;
friend class GListIterator<T>;
};
template <class T>
GListNode<T>::GListNode()
{
next = NULL;
prev = NULL;
}
template <class T>
GListNode<T>::GListNode( T item )
{
data = item;
next = NULL;
prev = NULL;
}
// GList: Class decleration and definition
template <class T> class GList
{
public:
// Contructors/destructors
GList();
//
Position InsertAtHead( T );
Position InsertAtTail( T );
T Remove( Position position );
void RemoveAll( void (*DeleteItem)( T ) );
void RemoveSelectedItems( bool (*NeedsRemovalFunc)( T ), void (*DeleteItemFunc)( T ) );
Position InsertAfter( T item, Position position );
Position InsertBefore( T item, Position position );
bool IsEmpty();
int GetNumItems();
T GetItemAtPosition( Position position );
Position GetPositionAtIndex( int index );
T GetItemAtIndex( int index );
protected:
GListNode<T> *head;
GListNode<T> *tail;
int numItems;
friend class GListIterator<T>;
};
template<class T>
GList<T>::GList()
{
// Set up a dummy head node and a dummy tail node.
head = new GListNode<T>;
tail = new GListNode<T>;
head->next = tail;
head->prev = head;
tail->next = tail;
tail->prev = head;
numItems = 0;
}
template<class T>
Position GList<T>::InsertAtHead( T item )
{
GListNode<T> *newNode = new GListNode<T>( item );
head->next->prev = newNode;
newNode->next = head->next;
newNode->prev = head;
head->next = newNode;
numItems++;
return ( Position )( void * )newNode;
}
template<class T>
Position GList<T>::InsertAtTail( T item )
{
GListNode<T> *newNode = new GListNode<T>( item );
tail->prev->next = newNode;
newNode->prev = tail->prev;
tail->prev = newNode;
newNode->next = tail;
numItems++;
return ( Position )( void * )newNode;
}
template<class T>
T GList<T>::Remove( Position position )
{
GListNode<T> *node = ( GListNode<T> * )( void * )position;
node->prev->next = node->next;
node->next->prev = node->prev;
T data = node->data;
numItems--;
delete node;
return data;
}
template<class T>
void GList<T>::RemoveAll( void (*DeleteItemFunc)( T ) )
{
GListNode<T> *tmpNode;
GListNode<T> *node = head->next;
while( node != tail )
{
if( DeleteItemFunc )
{
DeleteItemFunc( node->data );
}
tmpNode = node->next;
delete node;
node = tmpNode;
}
head->next = tail;
head->prev = head;
tail->next = tail;
tail->prev = head;
numItems = 0;
}
template<class T>
void GList<T>::RemoveSelectedItems( bool (*NeedsRemovalFunc)( T ), void (*DeleteItemFunc)( T ) )
{
GListNode<T> *tmpNode;
GListNode<T> *node = head->next;
while( node != tail )
{
if( NeedsRemovalFunc( node->data ) )
{
DeleteItemFunc( node->data );
node->prev->next = node->next;
node->next->prev = node->prev;
tmpNode = node;
node = node->next;
delete tmpNode;
numItems--;
}
else
{
node = node->next;
}
}
}
template<class T>
Position GList<T>::InsertAfter( T item, Position position )
{
GListNode<T> *node = ( GListNode<T> * )( void * )position;
GListNode<T> *newNode = new GListNode<T>( item );
newNode->prev = node;
newNode->next = node->next;
node->next->prev = newNode;
node->next = newNode;
numItems++;
return ( Position )( void * )newNode;
}
template<class T>
Position GList<T>::InsertBefore( T item, Position position )
{
GListNode<T> *node = ( GListNode<T> * )( void * )position;
GListNode<T> *newNode = new GListNode<T>( item );
newNode->prev = node->prev;
newNode->next = node;
node->prev->next = newNode;
node->prev = newNode;
numItems++;
return ( Position )( void * )newNode;
}
template<class T>
bool GList<T>::IsEmpty()
{
return ( numItems == 0 );
}
template <class T>
int GList<T>::GetNumItems()
{
return numItems;
}
template<class T>
T GList<T>::GetItemAtPosition( Position position )
{
return ( ( GListNode<T> * )( void * )position )->data;
}
template<class T>
Position GList<T>::GetPositionAtIndex( int index )
{
int i;
GListNode<T> *node = head->next;
for( i = 0; i < index; i++ )
{
node = node->next;
}
return ( Position )( void * )node;
}
template<class T>
T GList<T>::GetItemAtIndex( int index )
{
return GetItemAtPosition( GetPositionAtIndex( index ) );
}
// GListIterator: Class decleration and definition
template<class T> class GListIterator
{
public:
GListIterator( GList<T> *GList );
void GotoHead( void );
void GotoTail( void );
void Goto( int index );
void Increment();
void Decrement();
T GetCurrentAndIncrement();
T GetCurrentAndDecrement();
T IncrementAndGetCurrent();
T DecrementAndGetCurrent();
// postfix
T operator++( int ) { return GetCurrentAndIncrement(); }
T operator--( int ) { return GetCurrentAndDecrement(); }
// prefix
T operator++() { return IncrementAndGetCurrent(); }
T operator--() { return DecrementAndGetCurrent(); }
T GetCurrent();
bool AtEnd( void );
bool AtBeginning( void );
protected:
GList<T> *list;
GListNode<T> *currentNode;
};
template<class T>
GListIterator<T>::GListIterator( GList<T> *list )
{
this->list = list;
GotoHead();
}
template<class T>
void GListIterator<T>::GotoHead()
{
this->currentNode = list->head->next;
}
template<class T>
void GListIterator<T>::GotoTail()
{
this->currentNode = list->tail->prev;
}
template<class T>
void GListIterator<T>::Goto( int index )
{
currentNode = ( GListNode<T> * )( void * )list->GetPositionAtIndex( index );
}
template<class T>
void GListIterator<T>::Increment()
{
currentNode = currentNode->next;
}
template<class T>
void GListIterator<T>::Decrement()
{
currentNode = currentNode->prev;
}
template<class T>
T GListIterator<T>::GetCurrentAndIncrement()
{
T retval = currentNode->data;
Increment();
return retval;
}
template<class T>
T GListIterator<T>::GetCurrentAndDecrement()
{
T retval = currentNode->data;
Decrement();
return retval;
}
template<class T>
T GListIterator<T>::IncrementAndGetCurrent()
{
Increment();
return GetCurrent();
}
template<class T>
T GListIterator<T>::DecrementAndGetCurrent()
{
Decrement();
return GetCurrent();
}
template<class T>
T GListIterator<T>::GetCurrent()
{
return currentNode->data;
}
template<class T>
bool GListIterator<T>::AtEnd( void )
{
return currentNode->next == currentNode;
}
template<class T>
bool GListIterator<T>::AtBeginning( void )
{
return currentNode->prev == currentNode;
}
#endif /* __LIST_H__ */