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.
903 lines
26 KiB
903 lines
26 KiB
/****************************************************************************
|
|
**
|
|
** QMap and QMapIterator 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.
|
|
**
|
|
**********************************************************************/
|
|
|
|
|
|
/*****************************************************************************
|
|
QMap documentation
|
|
*****************************************************************************/
|
|
|
|
/*!
|
|
\class QMap ntqmap.h
|
|
\brief The QMap class is a value-based template class that
|
|
provides a dictionary.
|
|
|
|
\ingroup qtl
|
|
\ingroup tools
|
|
\ingroup shared
|
|
\mainclass
|
|
|
|
QMap is a TQt implementation of an STL-like map container. It can
|
|
be used in your application if the standard \c map is not
|
|
available on all your target platforms. QMap is part of the \link
|
|
ntqtl.html TQt Template Library\endlink.
|
|
|
|
QMap\<Key, Data\> defines a template instance to create a
|
|
dictionary with keys of type Key and values of type Data. QMap
|
|
does not store pointers to the members of the map; instead, it
|
|
holds a copy of every member. For this reason, QMap is
|
|
value-based, whereas QPtrList and QDict are pointer-based.
|
|
|
|
QMap contains and manages a collection of objects of type Data
|
|
with associated key values of type Key and provides iterators that
|
|
allow the contained objects to be addressed. QMap owns the
|
|
contained items.
|
|
|
|
Some classes cannot be used within a QMap. For example everything
|
|
derived from TQObject and thus all classes that implement widgets.
|
|
Only values can be used in a QMap. 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.
|
|
|
|
The class used for the key requires that the \c operator< is
|
|
implemented to define ordering of the keys.
|
|
|
|
QMap's function naming is consistent with the other TQt classes
|
|
(e.g., count(), isEmpty()). QMap also provides extra functions for
|
|
compatibility with STL algorithms, such as size() and empty().
|
|
Programmers already familiar with the STL \c map can use these
|
|
the STL-like functions if preferred.
|
|
|
|
Example:
|
|
\target qmap-eg
|
|
\code
|
|
#include <ntqstring.h>
|
|
#include <ntqmap.h>
|
|
#include <ntqstring.h>
|
|
|
|
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;
|
|
};
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
QApplication app( argc, argv );
|
|
|
|
typedef QMap<TQString, Employee> EmployeeMap;
|
|
EmployeeMap map;
|
|
|
|
map["JD001"] = Employee("John", "Doe", 50000);
|
|
map["JW002"] = Employee("Jane", "Williams", 80000);
|
|
map["TJ001"] = Employee("Tom", "Jones", 60000);
|
|
|
|
Employee sasha( "Sasha", "Hind", 50000 );
|
|
map["SH001"] = sasha;
|
|
sasha.setSalary( 40000 );
|
|
|
|
EmployeeMap::Iterator it;
|
|
for ( it = map.begin(); it != map.end(); ++it ) {
|
|
printf( "%s: %s, %s earns %d\n",
|
|
it.key().latin1(),
|
|
it.data().surname().latin1(),
|
|
it.data().forename().latin1(),
|
|
it.data().salary() );
|
|
}
|
|
return 0;
|
|
}
|
|
\endcode
|
|
|
|
Program output:
|
|
\code
|
|
JD001: Doe, John earns 50000
|
|
JW002: Williams, Jane earns 80000
|
|
SH001: Hind, Sasha earns 50000
|
|
TJ001: Jones, Tom earns 60000
|
|
\endcode
|
|
|
|
The latest changes to Sasha's salary did not affect the value in
|
|
the list because the map created a copy of Sasha's entry. In
|
|
addition, notice that the items are sorted alphabetically (by key)
|
|
when iterating over the map.
|
|
|
|
There are several ways to find items in a map. The begin() and
|
|
end() functions return iterators to the beginning and end of the
|
|
map. The advantage of using an iterator is that you can move
|
|
forward or backward by incrementing/decrementing the iterator.
|
|
The iterator returned by end() points to the element which is one
|
|
past the last element in the container. The past-the-end iterator
|
|
is still associated with the map it belongs to, however it is \e
|
|
not dereferenceable; operator*() will not return a well-defined
|
|
value. If the map is empty, the iterator returned by begin() will
|
|
equal the iterator returned by end().
|
|
|
|
Another way to find an element in the map is by using the find()
|
|
function. This returns an iterator pointing to the desired item or
|
|
to the end() iterator if no such element exists.
|
|
|
|
Another approach uses the operator[]. But be warned: if the map
|
|
does not contain an entry for the element you are looking for,
|
|
operator[] inserts a default value. If you do not know that the
|
|
element you are searching for is really in the list, you should
|
|
not use operator[]. The following example illustrates this:
|
|
|
|
\code
|
|
QMap<TQString,TQString> map;
|
|
map["Clinton"] = "Bill";
|
|
str << map["Clinton"] << map["Bush"] << endl;
|
|
\endcode
|
|
|
|
The code fragment will print out "Clinton", "". Since the value
|
|
associated with the "Bush" key did not exist, the map inserted a
|
|
default value (in this case, an empty string). If you are not
|
|
sure whether a certain element is in the map, you should use
|
|
find() and iterators instead.
|
|
|
|
If you just want to know whether a certain key is contained in the
|
|
map, use the contains() function. In addition, count() tells you
|
|
how many keys are in the map.
|
|
|
|
It is safe to have multiple iterators at the same time. If some
|
|
member of the map is removed, only iterators pointing to the
|
|
removed member become invalid; inserting in the map does not
|
|
invalidate any iterators.
|
|
|
|
Since QMap is value-based, there is no need to be concerned about
|
|
deleting items in the map. The map holds its own copies and will
|
|
free them if the corresponding member or the map itself is
|
|
deleted.
|
|
|
|
QMap is implicitly shared. This means you can just make copies of
|
|
the map in time O(1). If multiple QMap instances share the same
|
|
data and one is modifying the map's data, this modifying instance
|
|
makes a copy and modifies its private copy: so it does not affect
|
|
other instances. If a QMap is being used in a multi-threaded
|
|
program, you must protect all access to the map. See \l QMutex.
|
|
|
|
There are a couple of ways of inserting new items into the map.
|
|
One uses the insert() method; the other uses operator[]:
|
|
\code
|
|
QMap<TQString, TQString> map;
|
|
map["Clinton"] = "Bill";
|
|
map.insert( "Bush", "George" );
|
|
\endcode
|
|
|
|
Items can also be removed from the map in several ways. One way is
|
|
to pass an iterator to remove(). Another way is to pass a key
|
|
value to remove(), which will delete the entry with the requested
|
|
key. In addition you can clear the entire map using the clear()
|
|
method.
|
|
|
|
\sa QMapIterator
|
|
*/
|
|
|
|
|
|
/*! \enum QMap::key_type
|
|
The map's key type. */
|
|
/*! \enum QMap::mapped_type
|
|
The map's data type. */
|
|
/*! \enum QMap::value_type
|
|
Corresponds to TQPair\<key_type, mapped_type\>. */
|
|
/*! \enum QMap::ValueType
|
|
Corresponds to TQPair\<key_type, mapped_type\>, TQt style.*/
|
|
/*! \enum QMap::pointer
|
|
Pointer to value_type.*/
|
|
/*! \enum QMap::const_pointer
|
|
Const pointer to value_type.*/
|
|
/*! \enum QMap::reference
|
|
Reference to value_type.*/
|
|
/*! \enum QMap::const_reference
|
|
Const reference to value_type.*/
|
|
/*! \enum QMap::size_type
|
|
An unsigned integral type, used to represent various sizes. */
|
|
/*! \enum QMap::iterator
|
|
The map's iterator type.*/
|
|
/*! \enum QMap::Iterator
|
|
The map's iterator type, TQt style. */
|
|
/*! \enum QMap::const_iterator
|
|
The map's const iterator type.*/
|
|
/*! \enum QMap::ConstIterator
|
|
The map's const iterator type, TQt style.*/
|
|
/*! \enum QMap::difference_type
|
|
\internal */
|
|
/*! \enum QMap::Priv
|
|
\internal */
|
|
|
|
/*!
|
|
\fn QMap::QMap()
|
|
|
|
Constructs an empty map.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMap::QMap( const QMap<Key,T>& m )
|
|
|
|
Constructs a copy of \a m.
|
|
|
|
This operation costs O(1) time because QMap is implicitly shared.
|
|
This makes returning a QMap from a function very fast. If a shared
|
|
instance is modified, it will be copied (copy-on-write), and this
|
|
takes O(n) time.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMap::QMap( const std::map<Key,T>& m )
|
|
|
|
Constructs a copy of \a m.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMap<Key,T>& QMap::operator= ( const std::map<Key,T>& m )
|
|
|
|
\overload
|
|
|
|
Assigns \a m to this map and returns a reference to this map.
|
|
|
|
All iterators of the current map become invalidated by this
|
|
operation.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMap::~QMap()
|
|
|
|
Destroys the map. References to the values in the map and all
|
|
iterators of this map become invalidated. Since QMap is highly
|
|
tuned for performance you won't see warnings if you use invalid
|
|
iterators, because it is not possible for an iterator to check
|
|
whether it is valid or not.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMap<Key, T>& QMap::operator= (const QMap<Key, T>& m)
|
|
|
|
Assigns \a m to this map and returns a reference to this map.
|
|
|
|
All iterators of the current map become invalidated by this
|
|
operation. The cost of such an assignment is O(1), because QMap is
|
|
implicitly shared.
|
|
*/
|
|
|
|
/*!
|
|
\fn T& QMap::operator[] ( const Key& k )
|
|
|
|
Returns the value associated with the key \a k. If no such key is
|
|
present, an empty item is inserted with this key and a reference
|
|
to the empty item is returned.
|
|
|
|
You can use this operator both for reading and writing:
|
|
\code
|
|
QMap<TQString, TQString> map;
|
|
map["Clinton"] = "Bill";
|
|
stream << map["Clinton"];
|
|
\endcode
|
|
*/
|
|
|
|
/*!
|
|
\fn void QMap::clear()
|
|
|
|
Removes all items from the map.
|
|
|
|
\sa remove()
|
|
*/
|
|
|
|
/*!
|
|
\fn Iterator QMap::find( const Key& k )
|
|
|
|
Returns an iterator pointing to the element with key \a k in the
|
|
map.
|
|
|
|
Returns end() if no key matched.
|
|
|
|
\sa QMapIterator
|
|
*/
|
|
|
|
/*!
|
|
\fn ConstIterator QMap::find( const Key& k ) const
|
|
|
|
\overload
|
|
|
|
Returns an iterator pointing to the element with key \a k in the
|
|
map.
|
|
|
|
Returns end() if no key matched.
|
|
|
|
\sa QMapConstIterator
|
|
*/
|
|
|
|
/*!
|
|
\fn Iterator QMap::begin()
|
|
|
|
Returns an iterator pointing to the first element in the map. This
|
|
iterator equals end() if the map is empty.
|
|
|
|
The items in the map are traversed in the order defined by
|
|
operator\<(Key, Key).
|
|
|
|
\sa end() QMapIterator
|
|
*/
|
|
|
|
/*!
|
|
\fn ConstIterator QMap::begin() const
|
|
|
|
\overload
|
|
|
|
\sa end() QMapConstIterator
|
|
*/
|
|
|
|
/*!
|
|
\fn ConstIterator QMap::constBegin() const
|
|
|
|
Returns an iterator pointing to the first element in the map. This
|
|
iterator equals end() if the map is empty.
|
|
|
|
The items in the map are traversed in the order defined by
|
|
operator\<(Key, Key).
|
|
|
|
\sa constEnd() QMapConstIterator
|
|
*/
|
|
|
|
/*!
|
|
\fn Iterator QMap::end()
|
|
|
|
The iterator returned by end() points to the element which is one
|
|
past the last element in the container. The past-the-end iterator
|
|
is still associated with the map it belongs to, but it is \e not
|
|
dereferenceable; operator*() will not return a well-defined value.
|
|
|
|
This iterator equals begin() if the map is empty.
|
|
|
|
\sa begin() QMapIterator
|
|
*/
|
|
|
|
/*!
|
|
\fn ConstIterator QMap::end() const
|
|
|
|
\overload
|
|
*/
|
|
|
|
/*!
|
|
\fn ConstIterator QMap::constEnd() const
|
|
|
|
The iterator returned by end() points to the element which is one
|
|
past the last element in the container. The past-the-end iterator
|
|
is still associated with the map it belongs to, but it is \e not
|
|
dereferenceable; operator*() will not return a well-defined value.
|
|
|
|
This iterator equals constBegin() if the map is empty.
|
|
|
|
\sa constBegin() QMapConstIterator
|
|
*/
|
|
|
|
/*!
|
|
\fn void QMap::detach()
|
|
|
|
If the map does not share its data with another QMap instance,
|
|
nothing happens; otherwise the function creates a new copy of this
|
|
map and detaches from the shared one. This function is called
|
|
whenever the map is modified. The implicit sharing mechanism is
|
|
implemented this way.
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn QDataStream& operator>>( QDataStream& s, QMap<Key,T>& m )
|
|
|
|
\relates QMap
|
|
|
|
Reads the map \a m from the stream \a s. The types \e Key and \e T
|
|
must implement the streaming operator as well.
|
|
*/
|
|
|
|
/*!
|
|
\fn QDataStream& operator<<( QDataStream& s, const QMap<Key,T>& m )
|
|
|
|
\relates QMap
|
|
|
|
Writes the map \a m to the stream \a s. The types \e Key and \e T
|
|
must implement the streaming operator as well.
|
|
*/
|
|
|
|
/*!
|
|
\fn size_type QMap::size() const
|
|
|
|
Returns the number of items in the map.
|
|
|
|
This function is provided for STL compatibility. It is equivalent
|
|
to count().
|
|
|
|
\sa empty()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool QMap::empty() const
|
|
|
|
Returns TRUE if the map contains no items; otherwise returns
|
|
FALSE.
|
|
|
|
This function is provided for STL compatibility. It is equivalent
|
|
to isEmpty().
|
|
|
|
\sa size()
|
|
*/
|
|
|
|
/*!
|
|
\fn TQPair<iterator,bool> QMap::insert( const value_type& x )
|
|
|
|
\overload
|
|
|
|
Inserts the (key, value) pair \a x into the map. \a x is a TQPair
|
|
whose \c first element is a key to be inserted and whose \c second
|
|
element is the associated value to be inserted. Returns a pair
|
|
whose \c first element is an iterator pointing to the inserted
|
|
item and whose \c second element is a bool indicating TRUE if \a x
|
|
was inserted and FALSE if it was not inserted, e.g. because it was
|
|
already present.
|
|
|
|
\sa replace()
|
|
*/
|
|
|
|
/*!
|
|
\fn void QMap::erase( iterator it )
|
|
|
|
Removes the item associated with the iterator \a it from the map.
|
|
|
|
This function is provided for STL compatibility. It is equivalent
|
|
to remove().
|
|
|
|
\sa clear()
|
|
*/
|
|
|
|
/*!
|
|
\fn void QMap::erase( const key_type& k )
|
|
|
|
\overload
|
|
|
|
Removes the item with the key \a k from the map.
|
|
*/
|
|
|
|
/*!
|
|
\fn size_type QMap::count( const key_type& k ) const
|
|
|
|
Returns the number of items whose key is \a k. Since QMap does not
|
|
allow duplicate keys, the return value is always 0 or 1.
|
|
|
|
This function is provided for STL compatibility.
|
|
*/
|
|
|
|
/*!
|
|
\fn Iterator QMap::replace( const Key& k, const T& v )
|
|
|
|
Replaces the value of the element with key \a k, with the value \a
|
|
v.
|
|
|
|
\sa insert() remove()
|
|
*/
|
|
|
|
/*!
|
|
\fn const T& QMap::operator[] ( const Key& k ) const
|
|
|
|
\overload
|
|
|
|
\warning This function differs from the non-const version of the
|
|
same function. It will \e not insert an empty value if the key \a
|
|
k does not exist. This may lead to logic errors in your program.
|
|
You should check if the element exists before calling this
|
|
function.
|
|
|
|
Returns the value associated with the key \a k. If no such key is
|
|
present, a reference to an empty item is returned.
|
|
*/
|
|
|
|
/*!
|
|
\fn uint QMap::count() const
|
|
|
|
\overload
|
|
|
|
Returns the number of items in the map.
|
|
|
|
\sa isEmpty()
|
|
*/
|
|
|
|
/*!
|
|
\fn bool QMap::isEmpty() const
|
|
|
|
Returns TRUE if the map contains no items; otherwise returns
|
|
FALSE.
|
|
|
|
\sa count()
|
|
*/
|
|
|
|
/*!
|
|
\fn Iterator QMap::insert( const Key& key, const T& value, bool overwrite )
|
|
|
|
Inserts a new item with the key, \a key, and a value of \a value.
|
|
If there is already an item whose key is \a key, that item's value
|
|
is replaced with \a value, unless \a overwrite is FALSE (it is
|
|
TRUE by default). In this case an iterator to this item is
|
|
returned, else an iterator to the new item is returned.
|
|
|
|
*/
|
|
|
|
/*!
|
|
\fn void QMap::remove( iterator it )
|
|
|
|
Removes the item associated with the iterator \a it from the map.
|
|
|
|
\sa clear()
|
|
*/
|
|
|
|
/*!
|
|
\fn void QMap::remove( const Key& k )
|
|
|
|
\overload
|
|
|
|
Removes the item with the key \a k from the map.
|
|
*/
|
|
|
|
/*!
|
|
\fn bool QMap::contains( const Key& k ) const
|
|
|
|
Returns TRUE if the map contains an item with key \a k; otherwise
|
|
returns FALSE.
|
|
*/
|
|
|
|
|
|
/*****************************************************************************
|
|
QMapIterator documentation
|
|
*****************************************************************************/
|
|
|
|
/*!
|
|
\class QMapIterator ntqmap.h
|
|
\brief The QMapIterator class provides an iterator for QMap.
|
|
|
|
\ingroup qtl
|
|
\ingroup tools
|
|
|
|
You cannot create an iterator by yourself. Instead, you must ask a
|
|
map to give you one. An iterator is as big as a pointer; on 32-bit
|
|
machines that means 4 bytes, on 64-bit machines, 8 bytes. That
|
|
makes copying iterators very fast. Iterators behave in a similar
|
|
way to pointers, and they are almost as fast as pointers. See the
|
|
\link ntqmap.html#qmap-eg QMap example\endlink.
|
|
|
|
QMap is highly optimized for performance and memory usage, but the
|
|
trade-off is that you must be more careful. The only way to
|
|
traverse a map is to use iterators. QMap does not know about its
|
|
iterators, and the iterators don't even know to which map they
|
|
belong. That makes things fast but a bit dangerous because it is
|
|
up to you to make sure that the iterators you are using are still
|
|
valid. QDictIterator will be able to give warnings, whereas
|
|
QMapIterator may end up in an undefined state.
|
|
|
|
For every Iterator there is also a ConstIterator. You must use the
|
|
ConstIterator to access a QMap in a const environment or if the
|
|
reference or pointer to the map is itself const. Its semantics are
|
|
the same, but it only returns const references to the item it
|
|
points to.
|
|
|
|
\sa QMap QMapConstIterator
|
|
*/
|
|
|
|
/*! \enum QMapIterator::iterator_category
|
|
The type of iterator category, \c std::bidirectional_iterator_tag. */
|
|
/*! \enum QMapIterator::value_type
|
|
The type of value. */
|
|
/*! \enum QMapIterator::pointer
|
|
Pointer to value_type. */
|
|
/*! \enum QMapIterator::reference
|
|
Reference to value_type. */
|
|
/*! \enum QMapIterator::difference_type
|
|
\internal */
|
|
/*! \enum QMapIterator::NodePtr
|
|
\internal */
|
|
|
|
/*!
|
|
\fn QMapIterator::QMapIterator()
|
|
|
|
Creates an uninitialized iterator.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapIterator::QMapIterator (QMapNode<K, T> * p)
|
|
|
|
Constructs an iterator starting at node \a p.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapIterator::QMapIterator( const QMapIterator<K,T>& it )
|
|
|
|
Constructs a copy of the iterator, \a it.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapIterator<K,T>& QMapIterator::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 map. Incrementing the
|
|
iterator returned by end() causes undefined results.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapIterator<K,T> QMapIterator::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 map. Incrementing the
|
|
iterator returned by end() causes undefined results.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapIterator<K,T>& QMapIterator::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 map. Decrementing the
|
|
iterator returned by begin() causes undefined results.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapIterator<K,T> QMapIterator::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 map. Decrementing the
|
|
iterator returned by begin() causes undefined results.
|
|
*/
|
|
|
|
/*!
|
|
\fn T& QMapIterator::operator*()
|
|
|
|
Dereference operator. Returns a reference to the current item's
|
|
data. The same as data().
|
|
*/
|
|
|
|
/*!
|
|
\fn const T& QMapIterator::operator*() const
|
|
|
|
\overload
|
|
|
|
Dereference operator. Returns a const reference to the current
|
|
item's data. The same as data().
|
|
*/
|
|
|
|
/*!
|
|
\fn bool QMapIterator::operator==( const QMapIterator<K,T>& it ) const
|
|
|
|
Compares the iterator to the \a it iterator and returns TRUE if
|
|
they point to the same item; otherwise returns FALSE.
|
|
*/
|
|
|
|
/*!
|
|
\fn bool QMapIterator::operator!=( const QMapIterator<K,T>& it ) const
|
|
|
|
Compares the iterator to the \a it iterator and returns FALSE if
|
|
they point to the same item; otherwise returns TRUE.
|
|
*/
|
|
|
|
/*!
|
|
\fn T& QMapIterator::data()
|
|
|
|
Returns a reference to the current item's data.
|
|
*/
|
|
|
|
/*!
|
|
\fn const T& QMapIterator::data() const
|
|
|
|
\overload
|
|
|
|
Returns a const reference to the current item's data.
|
|
*/
|
|
|
|
/*!
|
|
\fn const K& QMapIterator::key() const
|
|
|
|
Returns a const reference to the current item's key.
|
|
*/
|
|
|
|
/*!
|
|
\fn QValueList<Key> QMap::keys() const
|
|
|
|
Returns a list of all the keys in the map, in order.
|
|
*/
|
|
|
|
/*!
|
|
\fn QValueList<T> QMap::values() const
|
|
|
|
Returns a list of all the values in the map, in key order.
|
|
*/
|
|
|
|
/*****************************************************************************
|
|
QMapConstIterator documentation
|
|
*****************************************************************************/
|
|
|
|
/*!
|
|
\class QMapConstIterator ntqmap.h
|
|
\brief The QMapConstIterator class provides an iterator for QMap.
|
|
|
|
\ingroup qtl
|
|
\ingroup tools
|
|
|
|
In contrast to QMapIterator, this class is used to iterate over a
|
|
const map. It does not allow you to modify the values of the map
|
|
because this would break the const semantics.
|
|
|
|
For more information on QMap iterators, see \l{QMapIterator} and
|
|
the \link ntqmap.html#qmap-eg QMap example\endlink.
|
|
|
|
\sa QMap QMapIterator
|
|
*/
|
|
|
|
/*! \enum QMapConstIterator::iterator_category
|
|
The type of iterator category, \c std::bidirectional_iterator_tag. */
|
|
/*! \enum QMapConstIterator::value_type
|
|
The type of const value. */
|
|
/*! \enum QMapConstIterator::pointer
|
|
Const pointer to value_type. */
|
|
/*! \enum QMapConstIterator::reference
|
|
Const reference to value_type. */
|
|
/*! \enum QMapConstIterator::difference_type
|
|
\internal */
|
|
/*! \enum QMapConstIterator::NodePtr
|
|
\internal */
|
|
|
|
|
|
/*!
|
|
\fn QMapConstIterator::QMapConstIterator()
|
|
|
|
Constructs an uninitialized iterator.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapConstIterator::QMapConstIterator (QMapNode<K, T> * p)
|
|
|
|
Constructs an iterator starting at node \a p.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapConstIterator::QMapConstIterator( const QMapConstIterator<K,T>& it )
|
|
|
|
Constructs a copy of the iterator, \a it.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapConstIterator::QMapConstIterator( const QMapIterator<K,T>& it )
|
|
|
|
Constructs a copy of the iterator, \a it.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapConstIterator<K,T>& QMapConstIterator::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 map. Incrementing the
|
|
iterator returned by end() causes undefined results.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapConstIterator<K,T> QMapConstIterator::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 map. Incrementing the
|
|
iterator returned by end() causes undefined results.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapConstIterator<K,T>& QMapConstIterator::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 map. Decrementing the
|
|
iterator returned by begin() causes undefined results.
|
|
*/
|
|
|
|
/*!
|
|
\fn QMapConstIterator<K,T> QMapConstIterator::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 map. Decrementing the
|
|
iterator returned by begin() causes undefined results.
|
|
*/
|
|
|
|
/*!
|
|
\fn const T& QMapConstIterator::operator*() const
|
|
|
|
Dereference operator. Returns a const reference to the current
|
|
item's data. The same as data().
|
|
*/
|
|
|
|
/*!
|
|
\fn bool QMapConstIterator::operator==( const QMapConstIterator<K,T>& it ) const
|
|
|
|
Compares the iterator to the \a it iterator and returns TRUE if
|
|
they point to the same item; otherwise returns FALSE.
|
|
*/
|
|
|
|
/*!
|
|
\fn bool QMapConstIterator::operator!=( const QMapConstIterator<K,T>& it ) const
|
|
|
|
Compares the iterator to the \a it iterator and returns FALSE if
|
|
they point to the same item; otherwise returns TRUE.
|
|
*/
|
|
|
|
/*!
|
|
\fn const T& QMapConstIterator::data() const
|
|
|
|
Returns a const reference to the current item's data.
|
|
*/
|
|
|
|
/*!
|
|
\fn const K& QMapConstIterator::key() const
|
|
|
|
Returns a const reference to the current item's key.
|
|
*/
|