You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1256 lines
36 KiB
1256 lines
36 KiB
/****************************************************************************
|
|
**
|
|
** TQPtrList and TQPtrListIterator class documentation
|
|
**
|
|
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
|
|
**
|
|
** This file is part of the TQt GUI Toolkit.
|
|
**
|
|
** This file may be used under the terms of the GNU General
|
|
** Public License versions 2.0 or 3.0 as published by the Free
|
|
** Software Foundation and appearing in the files LICENSE.GPL2
|
|
** and LICENSE.GPL3 included in the packaging of this file.
|
|
** Alternatively you may (at your option) use any later version
|
|
** of the GNU General Public License if such license has been
|
|
** publicly approved by Trolltech ASA (or its successors, if any)
|
|
** and the KDE Free TQt Foundation.
|
|
**
|
|
** Please review the following information to ensure GNU General
|
|
** Public Licensing requirements will be met:
|
|
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
|
|
** If you are unsure which license is appropriate for your use, please
|
|
** review the following information:
|
|
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
|
|
** or contact the sales department at sales@trolltech.com.
|
|
**
|
|
** This file may be used under the terms of the Q Public License as
|
|
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
|
|
** included in the packaging of this file. Licensees holding valid Qt
|
|
** Commercial licenses may use this file in accordance with the Qt
|
|
** Commercial License Agreement provided with the Software.
|
|
**
|
|
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
|
|
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
|
|
** herein.
|
|
**
|
|
**********************************************************************/
|
|
|
|
|
|
/*****************************************************************************
|
|
TQPtrList documentation
|
|
*****************************************************************************/
|
|
|
|
/*!
|
|
\class TQPtrList
|
|
\brief The TQPtrList class is a template class that provides a list.
|
|
|
|
\ingroup collection
|
|
\ingroup tools
|
|
|
|
\important autoDelete setAutoDelete
|
|
|
|
TQValueList is an STL-compatible alternative to this class.
|
|
|
|
Define a template instance TQPtrList\<X\> to create a list that
|
|
operates on pointers to X (X*).
|
|
|
|
The list class is indexable and has a \link at() current
|
|
index\endlink and a \link current() current item\endlink. The
|
|
first item corresponds to index position 0. The current index is
|
|
-1 if the current item is 0.
|
|
|
|
Items are inserted with prepend(), insert() or append(). Items are
|
|
removed with remove(), removeRef(), removeFirst() and
|
|
removeLast(). You can search for an item using find(), findNext(),
|
|
findRef() or findNextRef(). The list can be sorted with sort().
|
|
You can count the number of occurrences of an item with contains()
|
|
or containsRef(). You can get a pointer to the current item with
|
|
current(), to an item at a particular index position in the list
|
|
with at() or to the first or last item with getFirst() and
|
|
getLast(). You can also iterate over the list with first(),
|
|
last(), next() and prev() (which all update current()). The list's
|
|
deletion property is set with setAutoDelete().
|
|
|
|
\target example
|
|
Example:
|
|
\code
|
|
class Employee
|
|
{
|
|
public:
|
|
Employee() : sn( 0 ) { }
|
|
Employee( const TQString& forename, const TQString& surname, int salary )
|
|
: fn( forename ), sn( surname ), sal( salary )
|
|
{ }
|
|
|
|
void setSalary( int salary ) { sal = salary; }
|
|
|
|
TQString forename() const { return fn; }
|
|
TQString surname() const { return sn; }
|
|
int salary() const { return sal; }
|
|
|
|
private:
|
|
TQString fn;
|
|
TQString sn;
|
|
int sal;
|
|
};
|
|
|
|
TQPtrList<Employee> list;
|
|
list.setAutoDelete( TRUE ); // the list owns the objects
|
|
|
|
list.append( new Employee("John", "Doe", 50000) );
|
|
list.append( new Employee("Jane", "Williams", 80000) );
|
|
list.append( new Employee("Tom", "Jones", 60000) );
|
|
|
|
Employee *employee;
|
|
for ( employee = list.first(); employee; employee = list.next() )
|
|
cout << employee->surname().latin1() << ", " <<
|
|
employee->forename().latin1() << " earns " <<
|
|
employee->salary() << endl;
|
|
cout << endl;
|
|
|
|
// very inefficient for big lists
|
|
for ( uint i = 0; i < list.count(); ++i )
|
|
if ( list.at(i) )
|
|
cout << list.at( i )->surname().latin1() << endl;
|
|
\endcode
|
|
|
|
The output is
|
|
\code
|
|
Doe, John earns 50000
|
|
Williams, Jane earns 80000
|
|
Jones, Tom earns 60000
|
|
|
|
Doe
|
|
Williams
|
|
Jones
|
|
\endcode
|
|
|
|
TQPtrList has several member functions for traversing the list, but
|
|
using a TQPtrListIterator can be more practical. Multiple list
|
|
iterators may traverse the same list, independently of each other
|
|
and of the current list item.
|
|
|
|
In the example above we make the call setAutoDelete(TRUE).
|
|
Enabling auto-deletion tells the list to delete items that are
|
|
removed. The default is to not delete items when they are removed
|
|
but this would cause a memory leak in the example because there
|
|
are no other references to the list items.
|
|
|
|
When inserting an item into a list only the pointer is copied, not
|
|
the item itself, i.e. a shallow copy. It is possible to make the
|
|
list copy all of the item's data (deep copy) when an item is
|
|
inserted. insert(), inSort() and append() call the virtual
|
|
function TQPtrCollection::newItem() for the item to be inserted.
|
|
Inherit a list and reimplement newItem() to have deep copies.
|
|
|
|
When removing an item from a list, the virtual function
|
|
TQPtrCollection::deleteItem() is called. TQPtrList's default
|
|
implementation is to delete the item if auto-deletion is enabled.
|
|
|
|
The virtual function compareItems() can be reimplemented to
|
|
compare two list items. This function is called from all list
|
|
functions that need to compare list items, for instance
|
|
remove(const type*). If you only want to deal with pointers, there
|
|
are functions that compare pointers instead, for instance
|
|
removeRef(const type*). These functions are somewhat faster than
|
|
those that call compareItems().
|
|
|
|
List items are stored as \c void* in an internal QLNode, which
|
|
also holds pointers to the next and previous list items. The
|
|
functions currentNode(), removeNode(), and takeNode() operate
|
|
directly on the QLNode, but they should be used with care. The
|
|
data component of the node is available through QLNode::getData().
|
|
|
|
The TQStrList class defined in \l tqstrlist.h is a list of \c char*.
|
|
It reimplements newItem(), deleteItem() and compareItems(). (But
|
|
see TQStringList for a list of Unicode TQStrings.)
|
|
|
|
\sa TQPtrListIterator
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn TQPtrList::TQPtrList()
|
|
|
|
Constructs an empty list.
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrList::TQPtrList( const TQPtrList<type> &list )
|
|
|
|
Constructs a copy of \a list.
|
|
|
|
Each item in \a list is \link append() appended\endlink to this
|
|
list. Only the pointers are copied (shallow copy).
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrList::~TQPtrList()
|
|
|
|
Removes all items from the list and destroys the list.
|
|
|
|
All list iterators that access this list will be reset.
|
|
|
|
\sa setAutoDelete()
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrList<type> &TQPtrList::operator=(const TQPtrList<type> &list)
|
|
|
|
Assigns \a list to this list and returns a reference to this list.
|
|
|
|
This list is first cleared and then each item in \a list is \link
|
|
append() appended\endlink to this list. Only the pointers are
|
|
copied (shallow copy) unless newItem() has been reimplemented.
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::operator==(const TQPtrList<type> &list ) const
|
|
|
|
Compares this list with \a list. Returns TRUE if the lists contain
|
|
the same data; otherwise returns FALSE.
|
|
*/
|
|
|
|
/*!
|
|
\fn uint TQPtrList::count() const
|
|
|
|
Returns the number of items in the list.
|
|
|
|
\sa isEmpty()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::operator!=(const TQPtrList<type> &list ) const
|
|
|
|
Compares this list with \a list. Returns TRUE if the lists contain
|
|
different data; otherwise returns FALSE.
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn void TQPtrList::sort()
|
|
|
|
Sorts the list by the result of the virtual compareItems()
|
|
function.
|
|
|
|
The heap sort algorithm is used for sorting. It sorts n items with
|
|
O(n*log n) comparisons. This is the asymptotic optimal solution of
|
|
the sorting problem.
|
|
|
|
\sa inSort()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::isEmpty() const
|
|
|
|
Returns TRUE if the list is empty; otherwise returns FALSE.
|
|
|
|
\sa count()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::insert( uint index, const type *item )
|
|
|
|
Inserts the \a item at position \a index in the list.
|
|
|
|
Returns TRUE if successful, i.e. if \a index is in range;
|
|
otherwise returns FALSE. The valid range is 0 to count()
|
|
(inclusively). The item is appended if \a index == count().
|
|
|
|
The inserted item becomes the current list item.
|
|
|
|
\a item must not be 0.
|
|
|
|
\sa append(), current(), replace()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::replace( uint index, const type *item )
|
|
|
|
Replaces the item at position \a index with the new \a item.
|
|
|
|
Returns TRUE if successful, i.e. \a index is in the range 0 to
|
|
count()-1.
|
|
|
|
\sa append(), current(), insert()
|
|
*/
|
|
|
|
/*!
|
|
\fn void TQPtrList::inSort( const type *item )
|
|
|
|
Inserts the \a item at its sorted position in the list.
|
|
|
|
The sort order depends on the virtual compareItems() function. All
|
|
items must be inserted with inSort() to maintain the sorting
|
|
order.
|
|
|
|
The inserted item becomes the current list item.
|
|
|
|
\a item must not be 0.
|
|
|
|
\warning Using inSort() is slow. An alternative, especially if you
|
|
have lots of items, is to simply append() or insert() them and
|
|
then use sort(). inSort() takes up to O(n) compares. That means
|
|
inserting n items in your list will need O(n^2) compares whereas
|
|
sort() only needs O(n*log n) for the same task. So use inSort()
|
|
only if you already have a presorted list and want to insert just
|
|
a few additional items.
|
|
|
|
\sa insert(), compareItems(), current(), sort()
|
|
*/
|
|
|
|
/*!
|
|
\fn void TQPtrList::append( const type *item )
|
|
|
|
Inserts the \a item at the end of the list.
|
|
|
|
The inserted item becomes the current list item. This is
|
|
equivalent to \c{insert( count(), item )}.
|
|
|
|
\a item must not be 0.
|
|
|
|
\sa insert(), current(), prepend()
|
|
*/
|
|
|
|
/*!
|
|
\fn void TQPtrList::prepend( const type *item )
|
|
|
|
Inserts the \a item at the start of the list.
|
|
|
|
The inserted item becomes the current list item. This is
|
|
equivalent to \c{insert( 0, item )}.
|
|
|
|
\a item must not be 0.
|
|
|
|
\sa append(), insert(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::remove( uint index )
|
|
|
|
Removes the item at position \a index in the list.
|
|
|
|
Returns TRUE if successful, i.e. if \a index is in range;
|
|
otherwise returns FALSE. The valid range is \c{0..(count() - 1)}
|
|
inclusive.
|
|
|
|
The removed item is deleted if \link setAutoDelete()
|
|
auto-deletion\endlink is enabled.
|
|
|
|
The item after the removed item becomes the new current list item
|
|
if the removed item is not the last item in the list. If the last
|
|
item is removed, the new last item becomes the current item.
|
|
|
|
All list iterators that refer to the removed item will be set to
|
|
point to the new current item.
|
|
|
|
\sa take(), clear(), setAutoDelete(), current() removeRef()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::remove()
|
|
|
|
\overload
|
|
|
|
Removes the current list item.
|
|
|
|
Returns TRUE if successful, i.e. if the current item isn't 0;
|
|
otherwise returns FALSE.
|
|
|
|
The removed item is deleted if \link setAutoDelete()
|
|
auto-deletion\endlink is enabled.
|
|
|
|
The item after the removed item becomes the new current list item
|
|
if the removed item is not the last item in the list. If the last
|
|
item is removed, the new last item becomes the current item. The
|
|
current item is set to 0 if the list becomes empty.
|
|
|
|
All list iterators that refer to the removed item will be set to
|
|
point to the new current item.
|
|
|
|
\sa take(), clear(), setAutoDelete(), current() removeRef()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::remove( const type *item )
|
|
|
|
\overload
|
|
|
|
Removes the first occurrence of \a item from the list.
|
|
|
|
Returns TRUE if successful, i.e. if \a item is in the list;
|
|
otherwise returns FALSE.
|
|
|
|
The removed item is deleted if \link setAutoDelete()
|
|
auto-deletion\endlink is enabled.
|
|
|
|
The compareItems() function is called when searching for the item
|
|
in the list. If compareItems() is not reimplemented, it is more
|
|
efficient to call removeRef().
|
|
|
|
If \a item is NULL then the current item is removed from the list.
|
|
|
|
The item after the removed item becomes the new current list item
|
|
if the removed item is not the last item in the list. If the last
|
|
item is removed, the new last item becomes the current item. The
|
|
current item is set to 0 if the list becomes empty.
|
|
|
|
All list iterators that refer to the removed item will be set to
|
|
point to the new current item.
|
|
|
|
\sa removeRef(), take(), clear(), setAutoDelete(), compareItems(),
|
|
current()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::removeRef( const type *item )
|
|
|
|
Removes the first occurrence of \a item from the list.
|
|
|
|
Returns TRUE if successful, i.e. if \a item is in the list;
|
|
otherwise returns FALSE.
|
|
|
|
The removed item is deleted if \link setAutoDelete()
|
|
auto-deletion\endlink is enabled.
|
|
|
|
Equivalent to:
|
|
\code
|
|
if ( list.findRef( item ) != -1 )
|
|
list.remove();
|
|
\endcode
|
|
|
|
The item after the removed item becomes the new current list item
|
|
if the removed item is not the last item in the list. If the last
|
|
item is removed, the new last item becomes the current item. The
|
|
current item is set to 0 if the list becomes empty.
|
|
|
|
All list iterators that refer to the removed item will be set to
|
|
point to the new current item.
|
|
|
|
\sa remove(), clear(), setAutoDelete(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn void TQPtrList::removeNode( QLNode *node )
|
|
|
|
Removes the \a node from the list.
|
|
|
|
This node must exist in the list, otherwise the program may crash.
|
|
|
|
The removed item is deleted if \link setAutoDelete()
|
|
auto-deletion\endlink is enabled.
|
|
|
|
The first item in the list will become the new current list item.
|
|
The current item is set to 0 if the list becomes empty.
|
|
|
|
All list iterators that refer to the removed item will be set to
|
|
point to the item succeeding this item or to the preceding item if
|
|
the removed item was the last item.
|
|
|
|
\warning Do not call this function unless you are an expert.
|
|
|
|
\sa takeNode(), currentNode() remove() removeRef()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::removeFirst()
|
|
|
|
Removes the first item from the list. Returns TRUE if successful,
|
|
i.e. if the list isn't empty; otherwise returns FALSE.
|
|
|
|
The removed item is deleted if \link setAutoDelete()
|
|
auto-deletion\endlink is enabled.
|
|
|
|
The first item in the list becomes the new current list item. The
|
|
current item is set to 0 if the list becomes empty.
|
|
|
|
All list iterators that refer to the removed item will be set to
|
|
point to the new current item.
|
|
|
|
\sa removeLast(), setAutoDelete(), current() remove()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrList::removeLast()
|
|
|
|
Removes the last item from the list. Returns TRUE if successful,
|
|
i.e. if the list isn't empty; otherwise returns FALSE.
|
|
|
|
The removed item is deleted if \link setAutoDelete()
|
|
auto-deletion\endlink is enabled.
|
|
|
|
The last item in the list becomes the new current list item. The
|
|
current item is set to 0 if the list becomes empty.
|
|
|
|
All list iterators that refer to the removed item will be set to
|
|
point to the new current item.
|
|
|
|
\sa removeFirst(), setAutoDelete(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::take( uint index )
|
|
|
|
Takes the item at position \a index out of the list without
|
|
deleting it (even if \link setAutoDelete() auto-deletion\endlink
|
|
is enabled).
|
|
|
|
Returns a pointer to the item taken out of the list, or 0 if the
|
|
index is out of range. The valid range is \c{0..(count() - 1)}
|
|
inclusive.
|
|
|
|
The item after the removed item becomes the new current list item
|
|
if the removed item is not the last item in the list. If the last
|
|
item is removed, the new last item becomes the current item. The
|
|
current item is set to 0 if the list becomes empty.
|
|
|
|
All list iterators that refer to the taken item will be set to
|
|
point to the new current item.
|
|
|
|
\sa remove(), clear(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::take()
|
|
|
|
\overload
|
|
|
|
Takes the current item out of the list without deleting it (even
|
|
if \link setAutoDelete() auto-deletion\endlink is enabled).
|
|
|
|
Returns a pointer to the item taken out of the list, or 0 if
|
|
the current item is 0.
|
|
|
|
The item after the removed item becomes the new current list item
|
|
if the removed item is not the last item in the list. If the last
|
|
item is removed, the new last item becomes the current item. The
|
|
current item is set to 0 if the list becomes empty.
|
|
|
|
All list iterators that refer to the taken item will be set to
|
|
point to the new current item.
|
|
|
|
\sa remove(), clear(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::takeNode( QLNode *node )
|
|
|
|
Takes the \a node out of the list without deleting its item (even
|
|
if \link setAutoDelete() auto-deletion\endlink is enabled).
|
|
Returns a pointer to the item taken out of the list.
|
|
|
|
This node must exist in the list, otherwise the program may crash.
|
|
|
|
The first item in the list becomes the new current list item.
|
|
|
|
All list iterators that refer to the taken item will be set to
|
|
point to the item succeeding this item or to the preceding item if
|
|
the taken item was the last item.
|
|
|
|
\warning Do not call this function unless you are an expert.
|
|
|
|
\sa removeNode(), currentNode()
|
|
*/
|
|
|
|
/*!
|
|
\fn void TQPtrList::clear()
|
|
|
|
Removes all items from the list.
|
|
|
|
The removed items are deleted if \link setAutoDelete()
|
|
auto-deletion\endlink is enabled.
|
|
|
|
All list iterators that access this list will be reset.
|
|
|
|
\sa remove(), take(), setAutoDelete()
|
|
*/
|
|
|
|
/*!
|
|
\fn int TQPtrList::find( const type *item )
|
|
|
|
Finds the first occurrence of \a item in the list.
|
|
|
|
If the item is found, the list sets the current item to point to
|
|
the found item and returns the index of this item. If the item is
|
|
not found, the list sets the current item to 0, the current
|
|
index to -1, and returns -1.
|
|
|
|
The compareItems() function is called when searching for the item
|
|
in the list. If compareItems() is not reimplemented, it is more
|
|
efficient to call findRef().
|
|
|
|
\sa findNext(), findRef(), compareItems(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn int TQPtrList::findNext( const type *item )
|
|
|
|
Finds the next occurrence of \a item in the list, starting from
|
|
the current list item.
|
|
|
|
If the item is found, the list sets the current item to point to
|
|
the found item and returns the index of this item. If the item is
|
|
not found, the list sets the current item to 0, the current
|
|
index to -1, and returns -1.
|
|
|
|
The compareItems() function is called when searching for the item
|
|
in the list. If compareItems() is not reimplemented, it is more
|
|
efficient to call findNextRef().
|
|
|
|
\sa find(), findNextRef(), compareItems(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn int TQPtrList::findRef( const type *item )
|
|
|
|
Finds the first occurrence of \a item in the list.
|
|
|
|
If the item is found, the list sets the current item to point to
|
|
the found item and returns the index of this item. If the item is
|
|
not found, the list sets the current item to 0, the current
|
|
index to -1, and returns -1.
|
|
|
|
Calling this function is much faster than find() because find()
|
|
compares \a item with each list item using compareItems(), whereas
|
|
this function only compares the pointers.
|
|
|
|
\sa findNextRef(), find(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn int TQPtrList::findNextRef( const type *item )
|
|
|
|
Finds the next occurrence of \a item in the list, starting from
|
|
the current list item.
|
|
|
|
If the item is found, the list sets the current item to point to
|
|
the found item and returns the index of this item. If the item is
|
|
not found, the list sets the current item to 0, the current
|
|
index to -1, and returns -1.
|
|
|
|
Calling this function is much faster than findNext() because
|
|
findNext() compares \a item with each list item using
|
|
compareItems(), whereas this function only compares the pointers.
|
|
|
|
\sa findRef(), findNext(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn uint TQPtrList::contains( const type *item ) const
|
|
|
|
Returns the number of occurrences of \a item in the list.
|
|
|
|
The compareItems() function is called when looking for the \a item
|
|
in the list. If compareItems() is not reimplemented, it is more
|
|
efficient to call containsRef().
|
|
|
|
This function does not affect the current list item.
|
|
|
|
\sa containsRef(), compareItems()
|
|
*/
|
|
|
|
/*!
|
|
\fn uint TQPtrList::containsRef( const type *item ) const
|
|
|
|
Returns the number of occurrences of \a item in the list.
|
|
|
|
Calling this function is much faster than contains() because
|
|
contains() compares \a item with each list item using
|
|
compareItems(), whereas his function only compares the pointers.
|
|
|
|
This function does not affect the current list item.
|
|
|
|
\sa contains()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::at( uint index )
|
|
|
|
Returns a pointer to the item at position \a index in the list, or
|
|
0 if the index is out of range.
|
|
|
|
Sets the current list item to this item if \a index is valid. The
|
|
valid range is \c{0..(count() - 1)} inclusive.
|
|
|
|
This function is very efficient. It starts scanning from the first
|
|
item, last item, or current item, whichever is closest to \a
|
|
index.
|
|
|
|
\sa current()
|
|
*/
|
|
|
|
/*!
|
|
\fn int TQPtrList::at() const
|
|
|
|
\overload
|
|
|
|
Returns the index of the current list item. The returned value is
|
|
-1 if the current item is 0.
|
|
|
|
\sa current()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::current() const
|
|
|
|
Returns a pointer to the current list item. The current item may
|
|
be 0 (implies that the current index is -1).
|
|
|
|
\sa at()
|
|
*/
|
|
|
|
/*!
|
|
\fn QLNode *TQPtrList::currentNode() const
|
|
|
|
Returns a pointer to the current list node.
|
|
|
|
The node can be kept and removed later using removeNode(). The
|
|
advantage is that the item can be removed directly without
|
|
searching the list.
|
|
|
|
\warning Do not call this function unless you are an expert.
|
|
|
|
\sa removeNode(), takeNode(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::getFirst() const
|
|
|
|
Returns a pointer to the first item in the list, or 0 if the list
|
|
is empty.
|
|
|
|
This function does not affect the current list item.
|
|
|
|
\sa first(), getLast()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::getLast() const
|
|
|
|
Returns a pointer to the last item in the list, or 0 if the list
|
|
is empty.
|
|
|
|
This function does not affect the current list item.
|
|
|
|
\sa last(), getFirst()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::first()
|
|
|
|
Returns a pointer to the first item in the list and makes this the
|
|
current list item; returns 0 if the list is empty.
|
|
|
|
\sa getFirst(), last(), next(), prev(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::last()
|
|
|
|
Returns a pointer to the last item in the list and makes this the
|
|
current list item; returns 0 if the list is empty.
|
|
|
|
\sa getLast(), first(), next(), prev(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::next()
|
|
|
|
Returns a pointer to the item succeeding the current item. Returns
|
|
0 if the current item is 0 or equal to the last item.
|
|
|
|
Makes the succeeding item current. If the current item before this
|
|
function call was the last item, the current item will be set to
|
|
0. If the current item was 0, this function does nothing.
|
|
|
|
\sa first(), last(), prev(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrList::prev()
|
|
|
|
Returns a pointer to the item preceding the current item. Returns
|
|
0 if the current item is 0 or equal to the first item.
|
|
|
|
Makes the preceding item current. If the current item before this
|
|
function call was the first item, the current item will be set to
|
|
0. If the current item was 0, this function does nothing.
|
|
|
|
\sa first(), last(), next(), current()
|
|
*/
|
|
|
|
/*!
|
|
\fn void TQPtrList::toVector( TQGVector *vec ) const
|
|
|
|
Stores all list items in the vector \a vec.
|
|
|
|
The vector must be of the same item type, otherwise the result
|
|
will be undefined.
|
|
*/
|
|
|
|
/*!
|
|
\enum TQPtrList::iterator
|
|
|
|
\internal
|
|
*/
|
|
|
|
/*!
|
|
\enum TQPtrList::Iterator
|
|
|
|
\internal
|
|
*/
|
|
|
|
/*!
|
|
\enum TQPtrList::ConstIterator
|
|
|
|
\internal
|
|
*/
|
|
|
|
/*!
|
|
\enum TQPtrList::const_iterator
|
|
|
|
\internal
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrList::constBegin() const
|
|
|
|
\internal
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrList::constEnd() const
|
|
|
|
\internal
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrList::erase(Iterator)
|
|
|
|
\internal
|
|
*/
|
|
|
|
|
|
/*****************************************************************************
|
|
TQPtrListIterator documentation
|
|
*****************************************************************************/
|
|
|
|
/*!
|
|
\class TQPtrListIterator
|
|
\brief The TQPtrListIterator class provides an iterator for
|
|
TQPtrList collections.
|
|
|
|
\ingroup collection
|
|
\ingroup tools
|
|
|
|
Define a template instance TQPtrListIterator\<X\> to create a list
|
|
iterator that operates on TQPtrList\<X\> (list of X*).
|
|
|
|
The following example is similar to the \link
|
|
tqptrlist.html#example example in the TQPtrList class documentation
|
|
\endlink, but it uses TQPtrListIterator. The class Employee is
|
|
defined there.
|
|
|
|
\code
|
|
TQPtrList<Employee> list;
|
|
|
|
list.append( new Employee("John", "Doe", 50000) );
|
|
list.append( new Employee("Jane", "Williams", 80000) );
|
|
list.append( new Employee("Tom", "Jones", 60000) );
|
|
|
|
TQPtrListIterator<Employee> it( list );
|
|
Employee *employee;
|
|
while ( (employee = it.current()) != 0 ) {
|
|
++it;
|
|
cout << employee->surname().latin1() << ", " <<
|
|
employee->forename().latin1() << " earns " <<
|
|
employee->salary() << endl;
|
|
}
|
|
\endcode
|
|
|
|
The output is
|
|
\code
|
|
Doe, John earns 50000
|
|
Williams, Jane earns 80000
|
|
Jones, Tom earns 60000
|
|
\endcode
|
|
|
|
Using a list iterator is a more robust way of traversing the list
|
|
than using the TQPtrList member functions \link TQPtrList::first()
|
|
first\endlink(), \link TQPtrList::next() next\endlink(), \link
|
|
TQPtrList::current() current\endlink(), etc., as many iterators can
|
|
traverse the same list independently.
|
|
|
|
An iterator has its own current list item and can get the next and
|
|
previous list items. It doesn't modify the list in any way.
|
|
|
|
When an item is removed from the list, all iterators that point to
|
|
that item are updated to point to TQPtrList::current() instead to
|
|
avoid dangling references.
|
|
|
|
\sa TQPtrList
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrListIterator::TQPtrListIterator( const TQPtrList<type> &list )
|
|
|
|
Constructs an iterator for \a list. The current iterator item is
|
|
set to point on the first item in the \a list.
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrListIterator::~TQPtrListIterator()
|
|
|
|
Destroys the iterator.
|
|
*/
|
|
|
|
/*!
|
|
\fn uint TQPtrListIterator::count() const
|
|
|
|
Returns the number of items in the list this iterator operates on.
|
|
|
|
\sa isEmpty()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrListIterator::isEmpty() const
|
|
|
|
Returns TRUE if the list is empty; otherwise returns FALSE.
|
|
|
|
\sa count()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrListIterator::atFirst() const
|
|
|
|
Returns TRUE if the current iterator item is the first list item;
|
|
otherwise returns FALSE.
|
|
|
|
\sa toFirst(), atLast()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool TQPtrListIterator::atLast() const
|
|
|
|
Returns TRUE if the current iterator item is the last list item;
|
|
otherwise returns FALSE.
|
|
|
|
\sa toLast(), atFirst()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrListIterator::toFirst()
|
|
|
|
Sets the current iterator item to point to the first list item and
|
|
returns a pointer to the item. Sets the current item to 0 and
|
|
returns 0 if the list is empty.
|
|
|
|
\sa toLast(), atFirst()
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrListIterator::toLast()
|
|
|
|
Sets the current iterator item to point to the last list item and
|
|
returns a pointer to the item. Sets the current item to 0 and
|
|
returns 0 if the list is empty.
|
|
|
|
\sa toFirst(), atLast()
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrListIterator::operator type *() const
|
|
|
|
Cast operator. Returns a pointer to the current iterator item.
|
|
Same as current().
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrListIterator::operator*()
|
|
|
|
Asterisk operator. Returns a pointer to the current iterator item.
|
|
Same as current().
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrListIterator::current() const
|
|
|
|
Returns a pointer to the current iterator item. If the iterator is
|
|
positioned before the first item in the list or after the last
|
|
item in the list, 0 is returned.
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrListIterator::operator()()
|
|
|
|
Makes the succeeding item current and returns the original current
|
|
item.
|
|
|
|
If the current iterator item was the last item in the list or if
|
|
it was 0, 0 is returned.
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrListIterator::operator++()
|
|
|
|
Prefix ++ makes the succeeding item current and returns the new
|
|
current item.
|
|
|
|
If the current iterator item was the last item in the list or if
|
|
it was 0, 0 is returned.
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrListIterator::operator+=( uint jump )
|
|
|
|
Sets the current item to the item \a jump positions after the
|
|
current item and returns a pointer to that item.
|
|
|
|
If that item is beyond the last item or if the list is empty, it
|
|
sets the current item to 0 and returns 0
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrListIterator::operator--()
|
|
|
|
Prefix - makes the preceding item current and returns the new
|
|
current item.
|
|
|
|
If the current iterator item was the first item in the list or if
|
|
it was 0, 0 is returned.
|
|
*/
|
|
|
|
/*!
|
|
\fn type *TQPtrListIterator::operator-=( uint jump )
|
|
|
|
Returns the item \a jump positions before the current item or 0
|
|
if it is beyond the first item. Makes this the current item.
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPtrListIterator<type>& TQPtrListIterator::operator=( const TQPtrListIterator<type> &it )
|
|
|
|
Assignment. Makes a copy of the iterator \a it and returns a
|
|
reference to this iterator.
|
|
*/
|
|
|
|
|
|
/*****************************************************************************
|
|
TQStrList documentation
|
|
*****************************************************************************/
|
|
|
|
/*!
|
|
\class TQStrList tqstrlist.h
|
|
\brief The TQStrList class provides a doubly-linked list of char*.
|
|
|
|
\ingroup collection
|
|
\ingroup tools
|
|
\ingroup text
|
|
|
|
If you want a string list of \l{TQString}s use TQStringList.
|
|
|
|
This class is a TQPtrList\<char\> instance (a list of char*).
|
|
|
|
TQStrList can make deep or shallow copies of the strings that are
|
|
inserted.
|
|
|
|
A deep copy means that memory is allocated for the string and then
|
|
the string data is copied into that memory. A shallow copy is just
|
|
a copy of the pointer value and not of the string data itself.
|
|
|
|
The disadvantage of shallow copies is that because a pointer can
|
|
be deleted only once, the program must put all strings in a
|
|
central place and know when it is safe to delete them (i.e. when
|
|
the strings are no longer referenced by other parts of the
|
|
program). This can make the program more complex. The advantage of
|
|
shallow copies is that they consume far less memory than deep
|
|
copies. It is also much faster to copy a pointer (typically 4 or 8
|
|
bytes) than to copy string data.
|
|
|
|
A TQStrList that operates on deep copies will, by default, turn on
|
|
auto-deletion (see setAutoDelete()). Thus, by default TQStrList
|
|
will deallocate any string copies it allocates.
|
|
|
|
The virtual compareItems() function is reimplemented and does a
|
|
case-sensitive string comparison. The inSort() function will
|
|
insert strings in sorted order. In general it is fastest to insert
|
|
the strings as they come and sort() at the end; inSort() is useful
|
|
when you just have to add a few extra strings to an already sorted
|
|
list.
|
|
|
|
The TQStrListIterator class is an iterator for TQStrList.
|
|
*/
|
|
|
|
/*!
|
|
\fn TQStrList::TQStrList( bool deepCopies )
|
|
|
|
Constructs an empty list of strings. Will make deep copies of all
|
|
inserted strings if \a deepCopies is TRUE, or use shallow copies
|
|
if \a deepCopies is FALSE.
|
|
*/
|
|
|
|
/*!
|
|
\fn TQStrList::TQStrList( const TQStrList &list )
|
|
|
|
Constructs a copy of \a list.
|
|
|
|
If \a list has deep copies, this list will also get deep copies.
|
|
Only the pointers are copied (shallow copy) if the other list does
|
|
not use deep copies.
|
|
*/
|
|
|
|
/*!
|
|
\fn TQStrList::~TQStrList()
|
|
|
|
Destroys the list. All strings are removed.
|
|
*/
|
|
|
|
/*!
|
|
\fn TQStrList& TQStrList::operator=( const TQStrList& list )
|
|
|
|
Assigns \a list to this list and returns a reference to this list.
|
|
|
|
If \a list has deep copies, this list will also get deep copies.
|
|
Only the pointers are copied (shallow copy) if the other list does
|
|
not use deep copies.
|
|
*/
|
|
|
|
|
|
/*****************************************************************************
|
|
TQStrIList documentation
|
|
*****************************************************************************/
|
|
|
|
/*!
|
|
\class TQStrIList tqstrlist.h
|
|
\brief The TQStrIList class provides a doubly-linked list of char*
|
|
with case-insensitive comparison.
|
|
|
|
\ingroup collection
|
|
\ingroup tools
|
|
|
|
This class is a TQPtrList\<char\> instance (a list of char*).
|
|
|
|
TQStrIList is identical to TQStrList except that the virtual
|
|
compareItems() function is reimplemented to compare strings
|
|
case-insensitively. The inSort() function inserts strings in a
|
|
sorted order. In general it is fastest to insert the strings as
|
|
they come and sort() at the end; inSort() is useful when you just
|
|
have to add a few extra strings to an already sorted list.
|
|
|
|
The TQStrListIterator class works for TQStrIList.
|
|
|
|
\sa TQStringList
|
|
*/
|
|
|
|
/*!
|
|
\fn TQStrIList::TQStrIList( bool deepCopies )
|
|
|
|
Constructs a list of strings. Will make deep copies of all
|
|
inserted strings if \a deepCopies is TRUE, or use shallow copies
|
|
if \a deepCopies is FALSE.
|
|
*/
|
|
|
|
/*!
|
|
\fn TQStrIList::~TQStrIList()
|
|
|
|
Destroys the list. All strings are removed.
|
|
*/
|
|
|
|
/*!
|
|
\fn int TQPtrList::compareItems( TQPtrCollection::Item item1,
|
|
TQPtrCollection::Item item2 )
|
|
|
|
This virtual function compares two list items.
|
|
|
|
Returns:
|
|
\list
|
|
\i zero if \a item1 == \a item2
|
|
\i nonzero if \a item1 != \a item2
|
|
\endlist
|
|
|
|
This function returns \e int rather than \e bool so that
|
|
reimplementations can return three values and use it to sort by:
|
|
|
|
\list
|
|
\i 0 if \a item1 == \a item2
|
|
\i \> 0 (positive integer) if \a item1 \> \a item2
|
|
\i \< 0 (negative integer) if \a item1 \< \a item2
|
|
\endlist
|
|
|
|
inSort() requires that compareItems() is implemented as described
|
|
here.
|
|
|
|
This function should not modify the list because some const
|
|
functions call compareItems().
|
|
|
|
The default implementation compares the pointers.
|
|
*/
|
|
|
|
/*!
|
|
\fn TQDataStream& TQPtrList::read( TQDataStream& s,
|
|
TQPtrCollection::Item& item )
|
|
|
|
Reads a list item from the stream \a s and returns a reference to
|
|
the stream.
|
|
|
|
The default implementation sets \a item to 0.
|
|
|
|
\sa write()
|
|
*/
|
|
|
|
/*!
|
|
\fn TQDataStream& TQPtrList::write( TQDataStream& s,
|
|
TQPtrCollection::Item item ) const
|
|
|
|
Writes a list item, \a item to the stream \a s and returns a
|
|
reference to the stream.
|
|
|
|
The default implementation does nothing.
|
|
|
|
\sa read()
|
|
*/
|
|
|
|
/*! \fn iterator TQPtrList::begin()
|
|
\internal
|
|
*/
|
|
/*! \fn const_iterator TQPtrList::begin() const
|
|
\internal
|
|
*/
|
|
/*! \fn iterator TQPtrList::end()
|
|
\internal
|
|
*/
|
|
/*! \fn const_iterator TQPtrList::end() const
|
|
\internal
|
|
*/
|
|
|
|
/*****************************************************************************
|
|
TQStrListIterator documentation
|
|
*****************************************************************************/
|
|
|
|
/*!
|
|
\class TQStrListIterator tqstrlist.h
|
|
\brief The TQStrListIterator class is an iterator for the TQStrList
|
|
and TQStrIList classes.
|
|
|
|
\ingroup tools
|
|
|
|
This class is a TQPtrListIterator\<char\> instance. It can traverse
|
|
the strings in the TQStrList and TQStrIList classes.
|
|
*/
|
|
|
|
|
|
/*****************************************************************************
|
|
TQPtrListAutoDelete documentation
|
|
*****************************************************************************/
|
|
/*
|
|
\class TQPtrListAutoDelete
|
|
\brief The TQPtrListAutoDelete class is a template class that provides a list that auto-deletes its data.
|
|
|
|
\ingroup collection
|
|
\ingroup tools
|
|
|
|
A TQPtrListAutoDelete is identical to a TQPtrList with
|
|
setAutoDelete(TRUE).
|
|
*/
|