/**************************************************************************** ** ** TQValueList and TQValueListIterator 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. ** **********************************************************************/ /***************************************************************************** TQValueList documentation *****************************************************************************/ /*! \class TQValueList tqvaluelist.h \brief The TQValueList class is a value-based template class that provides lists. \ingroup qtl \ingroup tools \ingroup shared \mainclass \reentrant TQValueList is a TQt implementation of an STL-like list container. It can be used in your application if the standard \c list is not available for your target platform(s). TQValueList is part of the \link ntqtl.html TQt Template Library\endlink. TQValueList\ defines a template instance to create a list of values that all have the class T. Note that TQValueList does not store pointers to the members of the list; it holds a copy of every member. This is why these kinds of classes are called "value based"; TQPtrList and TQDict are "pointer based". TQValueList contains and manages a collection of objects of type T and provides iterators that allow the contained objects to be addressed. TQValueList owns the contained items. For more relaxed ownership semantics, see TQPtrCollection and friends which are pointer-based containers. Some classes cannot be used within a TQValueList, for example, all classes derived from TQObject and thus all classes that implement widgets. Only values can be used in a TQValueList. To qualify as a value the class must provide: \list \i a copy constructor; \i an assignment operator; \i a default constructor, i.e. a constructor that does not take any arguments. \endlist Note that C++ defaults to field-by-field assignment operators and copy constructors if no explicit version is supplied. In many cases this is sufficient. In addition, some compilers (e.g. Sun CC) might require that the class provides an equality operator (operator==()). TQValueList's function naming is consistent with the other Qt classes (e.g. count(), isEmpty()). TQValueList also provides extra functions for compatibility with STL algorithms, such as size() and empty(). Programmers already familiar with the STL \c list may prefer to use the STL-compatible functions. Example: \code class Employee { public: Employee(): sn(0) {} Employee( const TQString& forename, const TQString& surname, int salary ) : fn(forename), sn(surname), sal(salary) {} TQString forename() const { return fn; } TQString surname() const { return sn; } int salary() const { return sal; } void setSalary( int salary ) { sal = salary; } private: TQString fn; TQString sn; int sal; }; typedef TQValueList EmployeeList; EmployeeList list; list.append( Employee("John", "Doe", 50000) ); list.append( Employee("Jane", "Williams", 80000) ); list.append( Employee("Tom", "Jones", 60000) ); Employee mary( "Mary", "Hawthorne", 90000 ); list.append( mary ); mary.setSalary( 100000 ); EmployeeList::iterator it; for ( it = list.begin(); it != list.end(); ++it ) cout << (*it).surname().latin1() << ", " << (*it).forename().latin1() << " earns " << (*it).salary() << endl; // Output: // Doe, John earns 50000 // Williams, Jane earns 80000 // Hawthorne, Mary earns 90000 // Jones, Tom earns 60000 \endcode Notice that the latest changes to Mary's salary did not affect the value in the list because the list created a copy of Mary's entry. There are several ways to find items in the list. The begin() and end() functions return iterators to the beginning and end of the list. The advantage of getting an iterator is that you can move forward or backward from this position by incrementing/decrementing the iterator. The iterator returned by end() points to the item which is one \e past the last item in the container. The past-the-end iterator is still associated with the list it belongs to, however it is \e not dereferenceable; operator*() will not return a well-defined value. If the list is empty(), the iterator returned by begin() will equal the iterator returned by end(). Another way to find an item in the list is by using the \link ntqtl.html#qFind tqFind()\endlink algorithm. For example: \code TQValueList list; ... TQValueList::iterator it = tqFind( list.begin(), list.end(), 3 ); if ( it != list.end() ) // it points to the found item \endcode It is safe to have multiple iterators a the list at the same time. If some member of the list is removed, only iterators pointing to the removed member become invalid. Inserting into the list does not invalidate any iterator. For convenience, the function last() returns a reference to the last item in the list, and first() returns a reference to the the first item. If the list is empty(), both last() and first() have undefined behavior (your application will crash or do unpredictable things). Use last() and first() with caution, for example: \code TQValueList list; list.append( 1 ); list.append( 2 ); list.append( 3 ); ... if ( !list.empty() ) { // OK, modify the first item int& i = list.first(); i = 18; } ... TQValueList dlist; double d = dlist.last(); // undefined \endcode Because TQValueList is value-based there is no need to be careful about deleting items in the list. The list holds its own copies and will free them if the corresponding member or the list itself is deleted. You can force the list to free all of its items with clear(). TQValueList is shared implicitly, which means it can be copied in constant time, i.e. O(1). If multiple TQValueList instances share the same data and one needs to modify its contents, this modifying instance makes a copy and modifies its private copy; therefore it does not affect the other instances; this takes O(n) time. This is often called "copy on write". If a TQValueList is being used in a multi-threaded program, you must protect all access to the list. See \l TQMutex. There are several ways to insert items into the list. The prepend() and append() functions insert items at the beginning and the end of the list respectively. The insert() function comes in several flavors and can be used to add one or more items at specific positions within the list. Items can also be removed from the list in several ways. There are several variants of the remove() function, which removes a specific item from the list. The remove() function will find and remove items according to a specific item value. Lists can also be sorted using the \link ntqtl.html TQt Template Library\endlink. For example with qHeapSort(): Example: \code TQValueList list; list.append( 5 ); list.append( 8 ); list.append( 3 ); list.append( 4 ); qHeapSort( list ); \endcode \sa TQValueListIterator */ /*! \enum TQValueList::iterator The list's iterator type, TQValueListIterator. */ /*! \enum TQValueList::const_iterator The list's const iterator type, TQValueListConstIterator. */ /*! \enum TQValueList::value_type The type of the object stored in the list, T. */ /*! \enum TQValueList::pointer The pointer to T type. */ /*! \enum TQValueList::const_pointer The const pointer to T type. */ /*! \enum TQValueList::reference The reference to T type. */ /*! \enum TQValueList::const_reference The const reference to T type. */ /*! \enum TQValueList::size_type An unsigned integral type, used to represent various sizes. */ /*! \enum TQValueList::difference_type \internal */ /*! \enum TQValueList::ValueType \internal */ /*! \fn TQValueList::TQValueList() Constructs an empty list. */ /*! \fn TQValueList::TQValueList( const TQValueList& l ) Constructs a copy of \a l. This operation takes O(1) time because TQValueList is implicitly shared. The first modification to a list will take O(n) time. */ /*! \fn TQValueList::TQValueList( const std::list& l ) Contructs a copy of \a l. This constructor is provided for compatibility with STL containers. */ /*! \fn TQValueList::~TQValueList() Destroys the list. References to the values in the list and all iterators of this list become invalidated. Note that it is impossible for an iterator to check whether or not it is valid: TQValueList is highly tuned for performance, not for error checking. */ /*! \enum TQValueListIterator::NodePtr \internal */ /*! \enum TQValueListIterator::iterator_category \internal */ /*! \enum TQValueListIterator::size_type \internal */ /*! \enum TQValueListIterator::difference_type \internal */ /*! \fn TQValueListIterator::TQValueListIterator( NodePtr p ) \internal */ /*! \fn bool TQValueList::operator== ( const TQValueList& l ) const Compares both lists. Returns TRUE if this list and \a l are equal; otherwise returns FALSE. */ /*! \fn bool TQValueList::operator== ( const std::list& l ) const \overload Returns TRUE if this list and \a l are equal; otherwise returns FALSE. This operator is provided for compatibility with STL containers. */ /*! \fn TQValueList& TQValueList::operator= ( const TQValueList& l ) Assigns \a l to this list and returns a reference to this list. All iterators of the current list become invalidated by this operation. The cost of such an assignment is O(1) since TQValueList is implicitly shared. */ /*! \fn TQValueList& TQValueList::operator= ( const std::list& l ) \overload Assigns the contents of \a l to the list. All iterators of the current list become invalidated by this operation. */ /*! \fn bool TQValueList::operator!= ( const TQValueList& l ) const Compares both lists. Returns TRUE if this list and \a l are unequal; otherwise returns FALSE. */ /*! \fn iterator TQValueList::insert( iterator it, const T& x ) Inserts the value \a x in front of the item pointed to by the iterator, \a it. Returns an iterator pointing at the inserted item. \sa append(), prepend() */ /*! \fn uint TQValueList::remove( const T& x ) \overload Removes all items that have value \a x and returns the number of removed items. */ /*! \fn void TQValueList::clear() Removes all items from the list. \sa remove() */ /*! \fn iterator TQValueList::begin() \overload Returns an iterator pointing to the first item in the list. This iterator equals end() if the list is empty. \sa first(), end() */ /*! \fn const_iterator TQValueList::begin() const Returns an iterator pointing to the first item in the list. This iterator equals end() if the list is empty. \sa first(), end(), constBegin() */ /*! \fn const_iterator TQValueList::constBegin() const Returns an iterator pointing to the first item in the list. This iterator equals constEnd() if the list is empty. \sa begin() */ /*! \fn iterator TQValueList::end() Returns an iterator pointing \e past the last item in the list. This iterator equals begin() if the list is empty. \sa last(), begin(), constEnd() */ /*! \fn const_iterator TQValueList::end() const \overload Returns an iterator pointing \e past the last item in the list. This iterator equals begin() if the list is empty. \sa last(), begin() */ /*! \fn const_iterator TQValueList::constEnd() const Returns an iterator pointing \e past the last item in the list. This iterator equals constBegin() if the list is empty. \sa end() */ /*! \fn TQDataStream& operator>>( TQDataStream& s, TQValueList& l ) \relates TQValueList Reads a list, \a l, from the stream \a s. The type T stored in the list must implement the streaming operator. */ /*! \fn TQDataStream& operator<<( TQDataStream& s, const TQValueList& l ) \overload \relates TQValueList Writes a list, \a l, to the stream \a s. The type T stored in the list must implement the streaming operator. */ /*! \fn size_type TQValueList::size() const Returns the number of items in the list. This function is provided for STL compatibility. It is equivalent to count(). \sa empty() */ /*! \fn bool TQValueList::empty() const Returns TRUE if the list contains no items; otherwise returns FALSE. \sa size() */ /*! \fn void TQValueList::push_front( const T& x ) Inserts \a x at the beginning of the list. This function is provided for STL compatibility. It is equivalent to prepend(). */ /*! \fn void TQValueList::push_back( const T& x ) Inserts \a x at the end of the list. This function is provided for STL compatibility. It is equivalent to append(). */ /*! \fn iterator TQValueList::erase( iterator it ) Removes the item pointed to by \a it from the list. No iterators other than \a it or other iterators pointing at the same item as \a it are invalidated. Returns an iterator to the next item after \a it, or end() if there is no such item. This function is provided for STL compatibility. It is equivalent to remove(). */ /*! \fn iterator TQValueList::erase( iterator first, iterator last ) \overload Deletes all items from \a first to \a last (not including \a last). No iterators are invalidated, except those pointing to the removed items themselves. Returns \a last. */ /*! \fn reference TQValueList::front() Returns a reference to the first item. If the list contains no first item (i.e. empty() returns TRUE), the return value is undefined. This function is provided for STL compatibility. It is equivalent to first(). \sa back() */ /*! \fn const_reference TQValueList::front() const \overload */ /*! \fn reference TQValueList::back() Returns a reference to the last item. If the list contains no last item (i.e. empty() returns TRUE), the return value is undefined. This function is provided for STL compatibility. It is equivalent to last(). \sa front() */ /*! \fn const_reference TQValueList::back() const \overload */ /*! \fn void TQValueList::pop_front() Removes the first item. If there is no first item, this operation is undefined. This function is provided for STL compatibility. */ /*! \fn void TQValueList::pop_back() Removes the last item. If there is no last item, this operation is undefined. This function is provided for STL compatibility. */ /*! \fn void TQValueList::insert( iterator pos, size_type n, const T& x ) \overload Inserts \a n copies of \a x before position \a pos. */ /*! \fn void TQValueList::detach() \internal */ /*! \fn TQValueList& TQValueList::operator<< ( const T& x ) Adds the value \a x to the end of the list. Returns a reference to the list. */ /*! \fn const T& TQValueList::operator[] ( size_type i ) const Returns a const reference to the item with index \a i in the list. It is up to you to check whether this item really exists. You can do that easily with the count() function. However this operator does not check whether \a i is in range and will deliver undefined results if it does not exist. \warning This function uses a linear search and can be extremely slow for large lists. TQValueList is not optimized for random item access. If you need random access use a different container, such as TQValueVector. */ /*! \fn T& TQValueList::operator[] ( size_type i ) \overload Returns a non-const reference to the item with index \a i. */ /*! \fn const_iterator TQValueList::at( size_type i ) const Returns an iterator pointing to the item at position \a i in the list, or an undefined value if the index is out of range. \warning This function uses a linear search and can be extremely slow for large lists. TQValueList is not optimized for random item access. If you need random access use a different container, such as TQValueVector. */ /*! \fn iterator TQValueList::at( size_type i ) \overload Returns an iterator pointing to the item at position \a i in the list, or an undefined value if the index is out of range. */ /*! \fn iterator TQValueList::fromLast() \overload Returns an iterator to the last item in the list, or end() if there is no last item. Use the end() function instead. For example: \code TQValueList l; ... TQValueList::iterator it = l.end(); --it; if ( it != end() ) // ... \endcode */ /*! \fn const_iterator TQValueList::fromLast() const Returns an iterator to the last item in the list, or end() if there is no last item. Use the end() function instead. For example: \code TQValueList l; ... TQValueList::iterator it = l.end(); --it; if ( it != end() ) // ... \endcode */ /*! \fn TQValueList TQValueList::operator+( const TQValueList& l ) const Creates a new list and fills it with the items of this list. Then the items of \a l are appended. Returns the new list. */ /*! \fn TQValueList& TQValueList::operator+= ( const TQValueList& l ) Appends the items of \a l to this list. Returns a reference to this list. */ /*! \fn TQValueList& TQValueList::operator+= ( const T& x ) \overload Appends the value \a x to the list. Returns a reference to the list. */ /*! \fn uint TQValueList::count() const Returns the number of items in the list. \sa isEmpty() */ /*! \fn bool TQValueList::isEmpty() const Returns TRUE if the list contains no items; otherwise returns FALSE. \sa count() */ /*! \fn iterator TQValueList::append( const T& x ) Inserts \a x at the end of the list. \sa insert(), prepend() */ /*! \fn iterator TQValueList::prepend( const T& x ) Inserts \a x at the beginning of the list. \sa insert(), append() */ /*! \fn iterator TQValueList::remove( iterator it ) Removes the item pointed to by \a it from the list. No iterators other than \a it or other iterators pointing at the same item as \a it are invalidated. Returns an iterator to the next item after \a it, or end() if there is no such item. \sa clear() */ /*! \fn iterator TQValueList::find( const T& x ) Returns an iterator pointing to the first occurrence of \a x in the list. Returns end() is no item matched. */ /*! \fn const_iterator TQValueList::find( const T& x ) const \overload Returns an iterator pointing to the first occurrence of \a x in the list. Returns end() if no item matched. */ /*! \fn iterator TQValueList::find( iterator it, const T& x ) \overload Finds the first occurrence of \a x in the list starting at the position given by \a it. Returns end() if no item matched. */ /*! \fn const_iterator TQValueList::find( const_iterator it, const T& x ) const \overload Finds the first occurrence of \a x in the list starting at the position given by \a it. Returns end() if no item matched. */ /*! \fn uint TQValueList::contains( const T& x ) const Returns the number of occurrences of the value \a x in the list. */ /*! \fn int TQValueList::findIndex( const T& x ) const Returns the index of the first occurrence of the value \a x. Returns -1 if no item matched. */ /*! \fn T& TQValueList::first() Returns a reference to the first item. If the list contains no first item (i.e. isEmpty() returns TRUE), the return value is undefined. \sa last() */ /*! \fn const T& TQValueList::first() const \overload */ /*! \fn T& TQValueList::last() Returns a reference to the last item. If the list contains no last item (i.e. empty() returns TRUE), the return value is undefined. */ /*! \fn const T& TQValueList::last() const \overload */ /***************************************************************************** TQValueListIterator documentation *****************************************************************************/ /*! \class TQValueListIterator tqvaluelist.h \brief The TQValueListIterator class provides an iterator for TQValueList. \ingroup qtl \ingroup tools \reentrant An iterator is a class for accessing the items of a container class: a generalization of the index in an array. A pointer into a "const char *" and an index into an "int[]" are both iterators, and the general idea is to provide that functionality for any data structure. The TQValueListIterator class is an iterator for TQValueList instantiations. You can create the appropriate iterator type by using the \c iterator typedef provided by TQValueList. The only way to access the items in a TQValueList is to use an iterator. Example (see TQValueList for the complete code): \code EmployeeList::iterator it; for ( it = list.begin(); it != list.end(); ++it ) cout << (*it).surname().latin1() << ", " << (*it).forename().latin1() << " earns " << (*it).salary() << endl; // Output: // Doe, John earns 50000 // Williams, Jane earns 80000 // Hawthorne, Mary earns 90000 // Jones, Tom earns 60000 \endcode TQValueList is highly optimized for performance and memory usage. This means that you must be careful: TQValueList does not know about all its iterators and the iterators don't know to which list they belong. This makes things very fast, but if you're not careful, you can get spectacular bugs. Always make sure iterators are valid before dereferencing them or using them as parameters to generic algorithms in the STL or the \link ntqtl.html QTL\endlink. Using an invalid iterator is undefined (your application will probably crash). Many TQt functions return const value lists; to iterate over these you should make a copy and iterate over the copy. For every Iterator there is a ConstIterator. When accessing a TQValueList in a const environment or if the reference or pointer to the list is itself const, then you must use the ConstIterator. Its semantics are the same as the Iterator, but it only returns const references. \sa TQValueList, TQValueListConstIterator */ /*! \enum TQValueListIterator::value_type The type of value, T. */ /*! \enum TQValueListIterator::pointer Pointer to value_type. */ /*! \enum TQValueListIterator::reference Reference to value_type. */ /*! \fn TQValueListIterator::TQValueListIterator() Creates un uninitialized iterator. */ /* \fn TQValueListIterator::TQValueListIterator( NodePtr p ) \overload \internal */ /*! \fn TQValueListIterator::TQValueListIterator( const TQValueListIterator& it ) \overload Constructs a copy of the iterator \a it. */ /* Unfortunately not with MSVC \fn T *TQValueListIterator::operator->() Pointer operator. Returns a pointer to the current iterator item. The great advantage of this operator is that you can treat the iterator like a pointer. Example: \code TQValueList::Iterator it = list.begin(); for( ; it != end(); ++it ) it->show(); \endcode */ /*! \fn T& TQValueListIterator::operator*() Asterisk operator. Returns a reference to the current iterator item. */ /*! \fn const T& TQValueListIterator::operator*() const \overload Asterisk operator. Returns a reference to the current iterator item. */ /*! \fn TQValueListIterator& TQValueListIterator::operator++() Prefix ++ makes the succeeding item current and returns an iterator pointing to the new current item. The iterator cannot check whether it reached the end of the list. Incrementing the iterator returned by end() causes undefined results. */ /*! \fn TQValueListIterator TQValueListIterator::operator++(int) \overload Postfix ++ makes the succeeding item current and returns an iterator pointing to the new current item. The iterator cannot check whether it reached the end of the list. Incrementing the iterator returned by end() causes undefined results. */ /*! \fn TQValueListIterator& TQValueListIterator::operator--() Prefix -- makes the previous item current and returns an iterator pointing to the new current item. The iterator cannot check whether it reached the beginning of the list. Decrementing the iterator returned by begin() causes undefined results. */ /*! \fn TQValueListIterator TQValueListIterator::operator--(int) \overload Postfix -- makes the previous item current and returns an iterator pointing to the new current item. The iterator cannot check whether it reached the beginning of the list. Decrementing the iterator returned by begin() causes undefined results. */ /*! \fn TQValueListIterator& TQValueListIterator::operator+=(int j) Postfix -- jumps \a j steps forward in the list. The iterator cannot check whether it reached the end of the list. Jumping past the end() causes undefined results. */ /*! \fn TQValueListIterator& TQValueListIterator::operator-=(int j) Postfix -- jumps \a j steps backward in the list. The iterator cannot check whether it reached the beginning of the list. Jumping past begin() causes undefined results. */ /*! \fn bool TQValueListIterator::operator==( const TQValueListIterator& it ) const Compares this iterator and \a it and returns TRUE if they point to the same item; otherwise returns FALSE. */ /*! \fn bool TQValueListIterator::operator!=( const TQValueListIterator& it ) const Compares this iterator and \a it and returns TRUE if they point to different items; otherwise returns FALSE. */ /***************************************************************************** TQValueListConstIterator documentation *****************************************************************************/ /*! \class TQValueListConstIterator tqvaluelist.h \brief The TQValueListConstIterator class provides a const iterator for TQValueList. \ingroup qtl \ingroup tools \reentrant In contrast to TQValueListIterator, this class is used to iterate over a const list. It does not allow modification of the values of the list since that would break const semantics. You can create the appropriate const iterator type by using the \c const_iterator typedef provided by TQValueList. For more information on TQValueList iterators, see TQValueListIterator. \sa TQValueListIterator, TQValueList */ /*! \enum TQValueListConstIterator::value_type The type of value. */ /*! \enum TQValueListConstIterator::pointer Pointer to value_type. */ /*! \enum TQValueListConstIterator::reference Reference to value_type. */ /*! \enum TQValueListConstIterator::NodePtr \internal */ /*! \enum TQValueListConstIterator::iterator_category \internal */ /*! \enum TQValueListConstIterator::size_type \internal */ /*! \enum TQValueListConstIterator::difference_type \internal */ /*! \fn TQValueListConstIterator::TQValueListConstIterator() Creates un uninitialized iterator. */ /*! \fn TQValueListConstIterator::TQValueListConstIterator( NodePtr p ) \overload \internal */ /*! \fn TQValueListConstIterator::TQValueListConstIterator( const TQValueListConstIterator& it ) \overload Constructs a copy of the iterator \a it. */ /*! \fn TQValueListConstIterator::TQValueListConstIterator( const TQValueListIterator& it ) Constructs a copy of the iterator \a it. */ /* Unfortunately not with MSVC \fn const T *TQValueListConstIterator::operator->() Pointer operator. Returns a pointer to the current iterator item. The great advantage of this operator is that you can treat the iterator like a pointer. Example: \code TQValueList::Iterator it = list.begin(); for( ; it != end(); ++it ) it->show(); \endcode */ /*! \fn const T& TQValueListConstIterator::operator*() const Asterisk operator. Returns a reference to the current iterator item. */ /*! \fn TQValueListConstIterator& TQValueListConstIterator::operator++() Prefix ++ makes the succeeding item current and returns an iterator pointing to the new current item. The iterator cannot check whether it reached the end of the list. Incrementing the iterator returned by end() causes undefined results. */ /*! \fn TQValueListConstIterator TQValueListConstIterator::operator++(int) \overload Postfix ++ makes the succeeding item current and returns an iterator pointing to the new current item. The iterator cannot check whether it reached the end of the list. Incrementing the iterator returned by end() causes undefined results. */ /*! \fn TQValueListConstIterator& TQValueListConstIterator::operator--() Prefix -- makes the previous item current and returns an iterator pointing to the new current item. The iterator cannot check whether it reached the beginning of the list. Decrementing the iterator returned by begin() causes undefined results. */ /*! \fn TQValueListConstIterator TQValueListConstIterator::operator--(int) \overload Postfix -- makes the previous item current and returns an iterator pointing to the new current item. The iterator cannot check whether it reached the beginning of the list. Decrementing the iterator returned by begin() causes undefined results. */ /*! \fn bool TQValueListConstIterator::operator==( const TQValueListConstIterator& it ) const Compares this iterator with \a it and returns TRUE if they point to the same item; otherwise returns FALSE. */ /*! \fn bool TQValueListConstIterator::operator!=( const TQValueListConstIterator& it ) const Compares this iterator with \a it and returns TRUE if they point to different items; otherwise returns FALSE. */ /*! \enum TQValueList::Iterator This iterator is an instantiation of TQValueListIterator for the same type as this TQValueList. In other words, if you instantiate TQValueList, Iterator is a TQValueListIterator. Several member function use it, such as TQValueList::begin(), which returns an iterator pointing to the first item in the list. Functionally, this is almost the same as ConstIterator. The only difference is that you cannot use ConstIterator for non-const operations, and that the compiler can often generate better code if you use ConstIterator. \sa TQValueListIterator ConstIterator */ /*! \enum TQValueList::ConstIterator This iterator is an instantiation of TQValueListConstIterator for the same type as this TQValueList. In other words, if you instantiate TQValueList, ConstIterator is a TQValueListConstIterator. Several member function use it, such as TQValueList::begin(), which returns an iterator pointing to the first item in the list. Functionally, this is almost the same as Iterator. The only difference is you cannot use ConstIterator for non-const operations, and that the compiler can often generate better code if you use ConstIterator. \sa TQValueListIterator Iterator */