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< td align = "right" valign = "center" > < img src = "logo32.png" align = "right" width = "64" height = "32" border = "0" > < / td > < / tr > < / table > < h1 align = center > TQMapIterator Class Reference< / h1 >
< p > The TQMapIterator class provides an iterator for TQMap.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "qmap-h.html" > ntqmap.h< / a > > < / tt >
< p > < a href = "qmapiterator-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > typedef std::bidirectional_iterator_tag < a href = "#iterator_category" > < b > iterator_category< / b > < / a > < / li >
< li class = fn > typedef T < a href = "#value_type" > < b > value_type< / b > < / a > < / li >
< li class = fn > typedef T * < a href = "#pointer" > < b > pointer< / b > < / a > < / li >
< li class = fn > typedef T & < a href = "#reference" > < b > reference< / b > < / a > < / li >
< li class = fn > < a href = "#TQMapIterator" > < b > TQMapIterator< / b > < / a > ()< / li >
< li class = fn > < a href = "#TQMapIterator-2" > < b > TQMapIterator< / b > < / a > ( TQMapNode< K, T> * p )< / li >
< li class = fn > < a href = "#TQMapIterator-3" > < b > TQMapIterator< / b > < / a > ( const TQMapIterator< K, T> & it )< / li >
< li class = fn > bool < a href = "#operator-eq-eq" > < b > operator==< / b > < / a > ( const TQMapIterator< K, T> & it ) const< / li >
< li class = fn > bool < a href = "#operator!-eq" > < b > operator!=< / b > < / a > ( const TQMapIterator< K, T> & it ) const< / li >
< li class = fn > T & < a href = "#operator*" > < b > operator*< / b > < / a > ()< / li >
< li class = fn > const T & < a href = "#operator*-2" > < b > operator*< / b > < / a > () const< / li >
< li class = fn > const K & < a href = "#key" > < b > key< / b > < / a > () const< / li >
< li class = fn > T & < a href = "#data" > < b > data< / b > < / a > ()< / li >
< li class = fn > const T & < a href = "#data-2" > < b > data< / b > < / a > () const< / li >
< li class = fn > TQMapIterator< K, T> & < a href = "#operator++" > < b > operator++< / b > < / a > ()< / li >
< li class = fn > TQMapIterator< K, T> < a href = "#operator++-2" > < b > operator++< / b > < / a > ( int )< / li >
< li class = fn > TQMapIterator< K, T> & < a href = "#operator--" > < b > operator--< / b > < / a > ()< / li >
< li class = fn > TQMapIterator< K, T> < a href = "#operator---2" > < b > operator--< / b > < / a > ( int )< / li >
< / ul >
< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQMapIterator class provides an iterator for < a href = "ntqmap.html" > TQMap< / a > .
< p >
< p > 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
< a href = "ntqmap.html#qmap-eg" > TQMap example< / a > .
< p > TQMap 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. TQMap 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. < a href = "qdictiterator.html" > TQDictIterator< / a > will be able to give warnings, whereas
TQMapIterator may end up in an undefined state.
< p > For every Iterator there is also a ConstIterator. You must use the
ConstIterator to access a < a href = "ntqmap.html" > TQMap< / a > 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.
< p > < p > See also < a href = "ntqmap.html" > TQMap< / a > , < a href = "qmapconstiterator.html" > TQMapConstIterator< / a > , < a href = "ntqtl.html" > TQt Template Library Classes< / a > , and < a href = "tools.html" > Non-GUI Classes< / a > .
< hr > < h2 > Member Type Documentation< / h2 >
< h3 class = fn > < a name = "iterator_category" > < / a > TQMapIterator::iterator_category< / h3 >
The type of iterator category, < tt > std::bidirectional_iterator_tag< / tt > .
< h3 class = fn > < a name = "pointer" > < / a > TQMapIterator::pointer< / h3 >
Pointer to value_type.
< h3 class = fn > < a name = "reference" > < / a > TQMapIterator::reference< / h3 >
Reference to value_type.
< h3 class = fn > < a name = "value_type" > < / a > TQMapIterator::value_type< / h3 >
The type of value.
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQMapIterator" > < / a > TQMapIterator::TQMapIterator ()
< / h3 >
< p > Creates an uninitialized iterator.
< h3 class = fn > < a name = "TQMapIterator-2" > < / a > TQMapIterator::TQMapIterator ( TQMapNode< K, T> * p )
< / h3 >
< p > Constructs an iterator starting at node < em > p< / em > .
< h3 class = fn > < a name = "TQMapIterator-3" > < / a > TQMapIterator::TQMapIterator ( const < a href = "qmapiterator.html" > TQMapIterator< / a > < K, T> & it )
< / h3 >
< p > Constructs a copy of the iterator, < em > it< / em > .
< h3 class = fn > T & < a name = "data" > < / a > TQMapIterator::data ()
< / h3 >
< p > Returns a reference to the current item's data.
< h3 class = fn > const T & < a name = "data-2" > < / a > TQMapIterator::data () const
< / h3 >
< p > This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Returns a const reference to the current item's data.
< h3 class = fn > const K & < a name = "key" > < / a > TQMapIterator::key () const
< / h3 >
< p > Returns a const reference to the current item's key.
< h3 class = fn > bool < a name = "operator!-eq" > < / a > TQMapIterator::operator!= ( const < a href = "qmapiterator.html" > TQMapIterator< / a > < K, T> & it ) const
< / h3 >
< p > Compares the iterator to the < em > it< / em > iterator and returns FALSE if
they point to the same item; otherwise returns TRUE.
< h3 class = fn > T & < a name = "operator*" > < / a > TQMapIterator::operator* ()
< / h3 >
< p > Dereference operator. Returns a reference to the current item's
data. The same as < a href = "#data" > data< / a > ().
< h3 class = fn > const T & < a name = "operator*-2" > < / a > TQMapIterator::operator* () const
< / h3 >
< p > This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Dereference operator. Returns a const reference to the current
item's data. The same as < a href = "#data" > data< / a > ().
< h3 class = fn > < a href = "qmapiterator.html" > TQMapIterator< / a > < K, T> & < a name = "operator++" > < / a > TQMapIterator::operator++ ()
< / h3 >
< p > 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.
< h3 class = fn > < a href = "qmapiterator.html" > TQMapIterator< / a > < K, T> < a name = "operator++-2" > < / a > TQMapIterator::operator++ ( int )
< / h3 >
< p > This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > 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.
< h3 class = fn > < a href = "qmapiterator.html" > TQMapIterator< / a > < K, T> & < a name = "operator--" > < / a > TQMapIterator::operator-- ()
< / h3 >
< p > 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.
< h3 class = fn > < a href = "qmapiterator.html" > TQMapIterator< / a > < K, T> < a name = "operator---2" > < / a > TQMapIterator::operator-- ( int )
< / h3 >
< p > This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > 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.
< h3 class = fn > bool < a name = "operator-eq-eq" > < / a > TQMapIterator::operator== ( const < a href = "qmapiterator.html" > TQMapIterator< / a > < K, T> & it ) const
< / h3 >
< p > Compares the iterator to the < em > it< / em > iterator and returns TRUE if
they point to the same item; otherwise returns FALSE.
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