kicad/include/dlist.h

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2008 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
* Copyright (C) 1992-2008 Kicad Developers, see change_log.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef DLIST_H_
#define DLIST_H_
#include <stdio.h> // NULL definition.
class EDA_ITEM;
/**
* Class DHEAD
* is only for use by template class DLIST, use that instead.
*/
class DHEAD
{
protected:
EDA_ITEM* first; ///< first element in list, or NULL if list empty
EDA_ITEM* last; ///< last elment in list, or NULL if empty
unsigned count; ///< how many elements are in the list, automatically maintained.
bool meOwner; ///< I must delete the objects I hold in my destructor
/**
* Constructor DHEAD
* is protected so that a DHEAD can only be instantiated from within a
* DLIST template.
*/
DHEAD() :
first(0),
last(0),
count(0),
meOwner(true)
{
}
~DHEAD();
/**
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* Function append
* adds \a aNewElement to the end of the list.
* @param aNewElement The element to insert.
*/
void append( EDA_ITEM* aNewElement );
/**
* Function append
* adds \a aList to the end of the list.
* @param aList The list to aList.
*/
void append( DHEAD& aList );
/**
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* Function insert
* puts \a aNewElement just in front of \a aElementAfterMe in the list sequence.
* If \a aElementAfterMe is NULL, then simply append().
* @param aNewElement The element to insert.
* @param aElementAfterMe The element to insert \a aNewElement before,
* if NULL then append \a aNewElement onto end of list.
*/
void insert( EDA_ITEM* aNewElement, EDA_ITEM* aElementAfterMe );
/**
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* Function insert
* puts \a aNewElement in front of list sequence.
* @param aNewElement The element to insert.
*/
void insert( EDA_ITEM* aNewElement )
{
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insert( aNewElement, first );
}
/**
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* Function remove
* removes \a aElement from the list, but does not delete it.
* @param aElement The element to remove.
*/
void remove( EDA_ITEM* aElement );
public:
/**
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* Function DeleteAll
* deletes all items on the list and leaves the list empty. The destructor
* for each item is called.
*/
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void DeleteAll();
/**
* Function SetOwnership
* controls whether the list owns the objects and is responsible for
* deleteing their memory at time of this object's destruction.
*/
void SetOwnership( bool Iown ) { meOwner = Iown; }
/**
* Function GetCount
* returns the number of elements in the list.
*/
unsigned GetCount() const { return count; }
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#if defined(DEBUG)
void VerifyListIntegrity();
#endif
};
/**
* Class DLIST
* is the head of a doubly linked list. It contains pointers to the first
* and last elements in a doubly linked list. The elements in the list must
* be of class T or derived from T, and T must be derived from EDA_ITEM.
* @see DHEAD for additional public functions.
*/
template <class T>
class DLIST : public DHEAD
{
public:
/**
* operator T*
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* is a casting operator that returns \a GetFirst(), a T*
*/
operator T* () const { return GetFirst(); }
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/**
* operator ->
* is a dereferencing operator that returns \a GetFirst(), a T*
*/
T* operator -> () const { return GetFirst(); }
/**
* Function GetFirst
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* returns the first T* in the list without removing it, or NULL if
* the list is empty.
*/
T* GetFirst() const { return (T*) first; }
/**
* Function GetLast
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* returns the last T* in the list without removing it,
* or NULL if the list is empty.
*/
T* GetLast() const { return (T*) last; }
/**
* Function Append
* adds \a aNewElement to the end of the list.
* @param aNewElement The element to insert.
*/
void Append( T* aNewElement )
{
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append( aNewElement );
}
/**
* Function Append
* adds \a aList to the end of the list.
* @param aList The list to append to the end of the list.
*/
void Append( DLIST& aList )
{
append( aList );
}
/**
* Function Insert
* puts \a aNewElement just in front of \a aElementAfterMe in the list sequence.
* If aElementAfterMe is NULL, then simply Append()
* @param aNewElement The element to insert.
* @param aElementAfterMe The element to insert \a aNewElement before,
* if NULL then append \a aNewElement onto end of list.
*/
void Insert( T* aNewElement, T* aElementAfterMe )
{
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insert( aNewElement, aElementAfterMe );
}
/**
* Function Remove
* removes \a aElement from the list, but does not delete it.
* @param aElement The element to remove from the list.
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* @return T* - the removed element, so you can easily delete it upon return.
*/
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T* Remove( T* aElement )
{
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remove( aElement );
return aElement;
}
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//-----< STL like functions >---------------------------------------
T* begin() const { return GetFirst(); }
T* end() const { return NULL; }
T* PopFront()
{
if( GetFirst() )
return Remove( GetFirst() );
return NULL;
}
T* PopBack()
{
if( GetLast() )
return Remove( GetLast() );
return NULL;
}
/**
* Function PushFront
* puts aNewElement at front of list sequence.
* @param aNewElement The element to insert at the front of the list.
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*/
void PushFront( T* aNewElement )
{
insert( aNewElement );
}
/**
* Function PushBack
* puts aNewElement at the end of the list sequence.
* @param aNewElement The element to push to the end of the list.
*/
void PushBack( T* aNewElement )
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{
append( aNewElement );
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}
//-----</ STL like functions >--------------------------------------
};
#endif // DLIST_H_