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list.cpp
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list.cpp
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// list.cpp: implementation of the circular list class.
// this file should not be included in a project, but should be physically present.
// Only header file is used.
//////////////////////////////////////////////////////////////////////
#include "list.h"
//double linked list
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
template <class ListType>
list<ListType>::list()
{
CurrentItem = NULL;
list_size = ZERO;
}
template <class ListType>
list<ListType>::list(const list<ListType> &L)
{
CurrentItem = NULL;
list_size = ZERO;
while (list_size < L.Size())
Insert(L.Prev());
}
template <class ListType>
list<ListType>::~list()
{
if (list_size == ZERO) return;
listItem<ListType> *T;
//this deleting should be faster than Dump()
while (list_size > 1)
{
list_size--;
T = CurrentItem;
CurrentItem = CurrentItem->fw_ptr;
delete T; //DROP_MEM_BLOCK(T);
}
delete CurrentItem; //DROP_MEM_BLOCK(CurrentItem); //last item
}
template <class ListType>
ListType& list<ListType>::Curr()
//definition: returns current item
//should not be called if list is empty!
{
return (CurrentItem ->index);
}
template <class ListType>
ListType& list<ListType>::Next()
//shifts CurrentItem forward & returns that item
//should not be called if list is empty!
{
CurrentItem = CurrentItem ->fw_ptr;
return (CurrentItem ->index);
}
template <class ListType>
ListType& list<ListType>::Prev()
//shifts CurrentITem backward & returns that item
//should not be called if list is empty!
{
CurrentItem = CurrentItem ->bk_ptr;
return (CurrentItem ->index);
}
template <class ListType>
void list<ListType>::Insert(ListType &Item)
//Inserts an item in the position just before of CurrentItem
//Inserted element becomes CurrentItem
{
listItem<ListType> *NewItem;
NewItem = new listItem<ListType>; //GRAB_MEM_BLOCK(listItem<ListType>);
NewItem->index = Item;
if (CurrentItem == NULL)
{
CurrentItem = NewItem;
NewItem->bk_ptr = NewItem;
NewItem->fw_ptr = NewItem;
}
else
{
NewItem->bk_ptr = CurrentItem->bk_ptr;
CurrentItem->bk_ptr = NewItem;
NewItem->bk_ptr->fw_ptr = NewItem;
NewItem->fw_ptr = CurrentItem;
CurrentItem = NewItem;
};
list_size++;
}
template <class ListType>
void list<ListType>::Delete()
//Deletes an item in the position of CurrentItem
//next element in a list becomes CurrentItem
{
listItem<ListType> *T;
if (CurrentItem != NULL)
{
list_size--;
if (CurrentItem->fw_ptr == CurrentItem)
{//if only one element in a list, then just delete it
delete CurrentItem; //DROP_MEM_BLOCK(CurrentItem);
CurrentItem = NULL;
}
else
{
CurrentItem->fw_ptr->bk_ptr = CurrentItem ->bk_ptr;
CurrentItem->bk_ptr->fw_ptr = CurrentItem ->fw_ptr;
T = CurrentItem ->fw_ptr;
delete CurrentItem; //DROP_MEM_BLOCK(CurrentItem);
CurrentItem = T;
};
};
}
template <class ListType>
unsigned short list<ListType>::Size()
{
return (list_size);
}
template <class ListType>
list<ListType> & list<ListType>::operator =(list<ListType> &L)
{
Dump();
while (list_size < L.Size())
Insert(L.Prev());
return (*this);
}
template <class ListType>
listItem<ListType> * list<ListType>::GetCurItem()
{//procedure that returns pointer to the current handl, thus providing free browsing of the list
return (CurrentItem);
}
template <class ListType>
void list<ListType>::Dump()
{
while (list_size != ZERO)
Delete();
};
////single-linked list
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
template <class ListType>
slist<ListType>::slist()
{
CurrentItem = NULL;
list_size = ZERO;
}
template <class ListType>
slist<ListType>::slist(const slist<ListType> &L)
{//note, reverses order in the circular list!
list_size = ZERO;
CurrentItem = NULL;
while (list_size < L.Size())
Insert(L.Next());
}
template <class ListType>
slist<ListType>::~slist()
{
if (list_size == ZERO) return;
slistItem<ListType> *T;
//this deleting should be faster than Dump()
while (list_size > 1)
{
list_size--;
T = CurrentItem;
CurrentItem = CurrentItem->ptr;
delete T; //DROP_MEM_BLOCK(T);
}
delete CurrentItem; //DROP_MEM_BLOCK(CurrentItem); //last item
}
template <class ListType>
ListType& slist<ListType>::Curr()
//definition: returns current item
//should not be called if list is empty!
{
return (CurrentItem ->index);
}
template <class ListType>
ListType& slist<ListType>::Next()
//shifts CurrentItem forward & returns that item
//should not be called if list is empty!
{
CurrentItem = CurrentItem ->ptr;
return (CurrentItem ->index);
}
template <class ListType>
void slist<ListType>::Insert(ListType &Item)
//Inserts an item in the position just before of CurrentItem
//Inserted element becomes CurrentItem
{
slistItem<ListType> *NewItem;
NewItem = new slistItem<ListType>;//GRAB_MEM_BLOCK(slistItem<ListType>);
if (CurrentItem == NULL)
{
NewItem->index = Item;
CurrentItem = NewItem;
NewItem->ptr = NewItem;
}
else
{
NewItem->ptr = CurrentItem->ptr;
NewItem->index = CurrentItem->index;
CurrentItem->index = Item;
CurrentItem->ptr = NewItem;
};
list_size++;
}
template <class ListType>
void slist<ListType>::Delete()
//Deletes an item in the position of CurrentItem
//next element in a list becomes CurrentItem
{
slistItem<ListType> *T;
if (CurrentItem != NULL)
{
list_size--;
if (CurrentItem->ptr == CurrentItem)
{//if only one element in a list, then just delete it
delete CurrentItem; //DROP_MEM_BLOCK(CurrentItem);
CurrentItem = NULL;
}
else
{
T = CurrentItem ->ptr;
CurrentItem->index = T->index;
CurrentItem->ptr = T->ptr->ptr;
delete T; //DROP_MEM_BLOCK(T);
};
};
}
template <class ListType>
unsigned short slist<ListType>::Size()
{
return (list_size);
}
template <class ListType>
slist<ListType> & slist<ListType>::operator =(slist<ListType> &L)
{ //reverses order in the circular list!
Dump();
while (list_size < L.Size())
Insert(L.Next());
return (*this);
}
template <class ListType>
slistItem<ListType> * slist<ListType>::GetCurItem()
{//procedure that returns pointer to the current handl, thus providing free browsing of the list
return (CurrentItem);
}
template <class ListType>
void slist<ListType>::Dump()
{
while (list_size != ZERO)
Delete();
}