63b522d64b
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3075 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
328 lines
9.6 KiB
C++
328 lines
9.6 KiB
C++
/*-*- c++ -*-********************************************************
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* kbList.h : a double linked list *
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* *
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* (C) 1998-1999 by Karsten Ballüder (karsten@phy.hw.ac.uk) *
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* *
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* $Id$
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*
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*******************************************************************/
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#ifndef KBLIST_H
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# define KBLIST_H
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#ifdef __GNUG__
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# pragma interface "kbList.h"
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#endif
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#ifndef NULL
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# define NULL 0
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#endif
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/**@name Double linked list implementation. */
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//@{
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/** kbListNode is a class used by kbList. It represents a single
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element in the list. It is not intended for general use outside
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kbList functions.
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*/
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struct kbListNode
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{
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/// pointer to next node or NULL
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struct kbListNode *next;
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/// pointer to previous node or NULL
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struct kbListNode *prev;
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/// pointer to the actual data
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void *element;
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/** Constructor - it automatically links the node into the list, if
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the iprev, inext parameters are given.
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@param ielement pointer to the data for this node (i.e. the data itself)
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@param iprev if not NULL, use this as previous element in list
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@param inext if not NULL, use this as next element in list
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*/
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kbListNode( void *ielement,
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kbListNode *iprev = NULL,
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kbListNode *inext = NULL);
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/// Destructor.
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~kbListNode();
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};
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/** The main list class, handling void pointers as data.
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*/
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class kbList
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{
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public:
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/// An iterator class for kbList, just like for the STL classes.
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class iterator
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{
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protected:
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/// the node to which this iterator points
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kbListNode *node;
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friend class kbList;
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public:
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/** Constructor.
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@param n if not NULL, the node to which to point
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*/
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iterator(kbListNode *n = NULL);
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/** Dereference operator.
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@return the data pointer of the node belonging to this
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iterator
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*/
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void * operator*();
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/** This operator allows us to write if(i). It is <em>not</em> a
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dereference operator and the result is always useless apart
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from its logical value!
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*/
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operator void*() const { return node == NULL ? (void*)0 : (void*)(-1); }
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/** Increment operator - prefix, goes to next node in list.
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@return itself
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*/
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iterator & operator++();
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/** Decrement operator - prefix, goes to previous node in list.
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@return itself
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*/
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iterator & operator--();
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/** Increment operator - prefix, goes to next node in list.
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@return itself
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*/
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iterator & operator++(int); //postfix
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/** Decrement operator - prefix, goes to previous node in list.
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@return itself
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*/
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iterator & operator--(int); //postfix
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/** Comparison operator.
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@return true if not equal.
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*/
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bool operator !=(iterator const &) const;
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/* Comparison operator.
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@return true if equal
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*/
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bool operator ==(iterator const &) const;
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/** Returns a pointer to the node associated with this iterator.
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This function is not for general use and should be
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protected. However, if protected, it cannot be called from
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derived classes' iterators. (Is this a bug in gcc/egcs?)
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@return the node pointer
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*/
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inline kbListNode * Node(void) const
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{ return node; }
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};
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/** Constructor.
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@param ownsEntriesFlag if true, the list owns the entries and
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will issue a delete on each of them when deleting them. If
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false, the entries themselves will not get deleted. Do not use
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this with array types!
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*/
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kbList(bool ownsEntriesFlag = true);
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/** Destructor.
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If entries are owned, they will all get deleted from here.
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*/
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~kbList();
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/** Tell list whether it owns objects. If owned, they can be
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deleted by list. See the constructor for more details.
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@param ownsflag if true, list will own entries
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*/
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void ownsObjects(bool ownsflag = true)
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{ ownsEntries = ownsflag; }
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/** Query whether list owns entries.
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@return true if list owns entries
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*/
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bool ownsObjects(void)
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{ return ownsEntries; }
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// This must be protected to disallow insertion of wrong elements.
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protected:
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/** Add an entry at the end of the list.
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@param element pointer to data
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*/
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void push_back(void *element);
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/** Add an entry at the head of the list.
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@param element pointer to data
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*/
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void push_front(void *element);
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/** Insert an element into the list.
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@param i an iterator pointing to the element, before which the new one should be inserted
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@param element the element data
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*/
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void insert(iterator & i, void *element);
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public:
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/** Get element from end of the list and delete it.
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NOTE: In this case the element's data will not get deleted by
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the list. It is the responsibility of the caller to free it.
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@return the element data
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*/
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void * pop_back(void);
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/** Get element from head of the list and delete it.
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NOTE: In this case the element's data will not get deleted by
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the list. It is the responsibility of the caller to free it.
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@return the element data
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*/
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void * pop_front(void);
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/** Remove an element from the list _without_ deleting the object.
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@param i iterator pointing to the element to be deleted
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@return the value of the element just removed
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*/
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void *remove(iterator& i) { void *p = *i; doErase(i); return p; }
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/** Erase an element, move iterator to following element.
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@param i iterator pointing to the element to be deleted
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*/
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void erase(iterator & i) { deleteContent(i); doErase(i); }
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/* Get head of list.
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@return iterator pointing to head of list
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*/
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iterator begin(void) const;
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/* Get end of list.
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@return iterator pointing after the end of the list. This is an
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invalid iterator which cannot be dereferenced or decremented. It is
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only of use in comparisons. NOTE: this is different from STL!
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@see tail
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*/
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iterator end(void) const;
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/* Get last element in list.
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@return iterator pointing to the last element in the list.
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@see end
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*/
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iterator tail(void) const;
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/* Get the number of elements in the list.
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@return number of elements in the list
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*/
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unsigned size(void) const;
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/* Query whether list is empty.
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@return true if list is empty
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*/
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inline bool empty(void) const
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{ return first == NULL ; }
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protected:
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/// if true, list owns entries
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bool ownsEntries;
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/// pointer to first element in list
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kbListNode *first;
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/// pointer to last element in list
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kbListNode *last;
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protected:
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/** Erase an element, move iterator to following element.
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@param i iterator pointing to the element to be deleted
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*/
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void doErase(iterator & i);
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/** Deletes the actual content if ownsflag is set.
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param iterator i
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*/
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inline void deleteContent(iterator i)
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{ if(ownsEntries) delete *i; }
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private:
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/// forbid copy construction
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kbList(kbList const &foo);
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/// forbid assignments
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kbList& operator=(const kbList& foo);
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};
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/// just for backward compatibility, will be removed soon
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typedef kbList::iterator kbListIterator;
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/// cast an iterator to a pointer, compatibility only to be removed
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#define kbListICast(type, iterator) ((type *)*iterator)
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/// cast an iterator to a const pointer, compatibility only to be removed
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#define kbListIcCast(type, iterator) ((type const *)*iterator)
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/** Macro to define a kbList with a given name, having elements of
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pointer to the given type. I.e. KBLIST_DEFINE(Int,int) would
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create a kbListInt type holding int pointers.
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*/
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#define KBLIST_DEFINE(name,type) \
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class name : public kbList \
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{ \
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public: \
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class iterator : public kbList::iterator \
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{ \
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protected: \
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inline iterator(kbList::iterator const & i) \
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{ node = i.Node(); } \
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friend class name; \
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public: \
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inline iterator(kbListNode *n = NULL) \
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: kbList::iterator(n) {} \
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inline type * operator*() \
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/* the cast is needed for MS VC++ 5.0 */ \
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{ return (type *)((kbList::iterator *)this)->operator*() ; } \
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}; \
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inline name(bool ownsEntriesFlag = TRUE) \
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: kbList(ownsEntriesFlag) {} \
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\
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inline type *pop_back(void) \
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{ return (type *) kbList::pop_back(); } \
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\
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inline type *pop_front(void) \
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{ return (type *) kbList::pop_front(); } \
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inline void push_back(type *element) \
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{ kbList::push_back( (void *) element); } \
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void push_front(type *element) \
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{ kbList::push_front( (void *) element); } \
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void insert(iterator & i, void *element) \
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{ kbList::insert( i, (void *) element); } \
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type *remove(iterator& i) \
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{ return (type *)kbList::remove(i); } \
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inline void erase(iterator & i) \
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{ deleteContent(i); doErase(i); } \
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\
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inline iterator begin(void) const \
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{ return kbList::begin(); } \
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\
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inline iterator end(void) const \
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{ return kbList::end(); } \
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\
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inline iterator tail(void) const \
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{ return kbList::tail(); } \
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~name() \
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{ \
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kbListNode *next; \
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while ( first != NULL ) \
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{ \
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next = first->next; \
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if(ownsEntries) \
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delete (type *)first->element; \
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delete first; \
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first = next; \
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} \
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} \
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protected: \
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inline void deleteContent(iterator i) \
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{ if(ownsEntries) delete *i; } \
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}
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#ifdef MCONFIG_H
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/// define the most commonly used list type once:
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KBLIST_DEFINE(kbStringList, String);
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#endif
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//@}
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#endif // KBLIST_H
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