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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>TQValueListIterator Class Reference</h1>
<p>The TQValueListIterator class provides an iterator for TQValueList.
<a href="#details">More...</a>
<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when TQt is built with thread support.</p>
<p><tt>#include <<a href="qvaluelist-h.html">ntqvaluelist.h</a>></tt>
<p><a href="qvaluelistiterator-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<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="#TQValueListIterator"><b>TQValueListIterator</b></a> ()</li>
<li class=fn><a href="#TQValueListIterator-3"><b>TQValueListIterator</b></a> ( const TQValueListIterator<T> & it )</li>
<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const TQValueListIterator<T> & it ) const</li>
<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const TQValueListIterator<T> & it ) const</li>
<li class=fn>const T & <a href="#operator*-2"><b>operator*</b></a> () const</li>
<li class=fn>T & <a href="#operator*"><b>operator*</b></a> ()</li>
<li class=fn>TQValueListIterator<T> & <a href="#operator++"><b>operator++</b></a> ()</li>
<li class=fn>TQValueListIterator<T> <a href="#operator++-2"><b>operator++</b></a> ( int )</li>
<li class=fn>TQValueListIterator<T> & <a href="#operator--"><b>operator--</b></a> ()</li>
<li class=fn>TQValueListIterator<T> <a href="#operator---2"><b>operator--</b></a> ( int )</li>
<li class=fn>TQValueListIterator<T> & <a href="#operator+-eq"><b>operator+=</b></a> ( int j )</li>
<li class=fn>TQValueListIterator<T> & <a href="#operator--eq"><b>operator-=</b></a> ( int j )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The TQValueListIterator class provides an iterator for <a href="ntqvaluelist.html">TQValueList</a>.
<p>
<p> 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.
<p> The TQValueListIterator class is an iterator for TQValueList
instantiations. You can create the appropriate iterator type by
using the <tt>iterator</tt> typedef provided by TQValueList.
<p> The only way to access the items in a TQValueList is to use an
iterator.
<p> Example (see TQValueList for the complete code):
<pre>
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
</pre>
<p> <a href="ntqvaluelist.html">TQValueList</a> 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 <a href="ntqtl.html">TQTL</a>.
<p> 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.
<p> 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.
<p> <p>See also <a href="ntqvaluelist.html">TQValueList</a>, <a href="qvaluelistconstiterator.html">TQValueListConstIterator</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="pointer"></a>TQValueListIterator::pointer</h3>
Pointer to value_type.
<h3 class=fn><a name="reference"></a>TQValueListIterator::reference</h3>
Reference to value_type.
<h3 class=fn><a name="value_type"></a>TQValueListIterator::value_type</h3>
The type of value, T.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="TQValueListIterator"></a>TQValueListIterator::TQValueListIterator ()
</h3>
<p> Creates un uninitialized iterator.
<h3 class=fn><a name="TQValueListIterator-3"></a>TQValueListIterator::TQValueListIterator ( const <a href="qvaluelistiterator.html">TQValueListIterator</a><T> & it )
</h3>
<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Constructs a copy of the iterator <em>it</em>.
<h3 class=fn>bool <a name="operator!-eq"></a>TQValueListIterator::operator!= ( const <a href="qvaluelistiterator.html">TQValueListIterator</a><T> & it ) const
</h3>
<p> Compares this iterator and <em>it</em> and returns TRUE if they point to
different items; otherwise returns FALSE.
<h3 class=fn>T & <a name="operator*"></a>TQValueListIterator::operator* ()
</h3>
<p> Asterisk operator. Returns a reference to the current iterator item.
<h3 class=fn>const T & <a name="operator*-2"></a>TQValueListIterator::operator* () const
</h3>
<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Asterisk operator. Returns a reference to the current iterator item.
<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> & <a name="operator++"></a>TQValueListIterator::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 list. Incrementing the
iterator returned by end() causes undefined results.
<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> <a name="operator++-2"></a>TQValueListIterator::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 list. Incrementing the
iterator returned by end() causes undefined results.
<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> & <a name="operator+-eq"></a>TQValueListIterator::operator+= ( int j )
</h3>
<p> Postfix -- jumps <em>j</em> steps forward in the list. The iterator
cannot check whether it reached the end of the list. Jumping past
the end() causes undefined results.
<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> & <a name="operator--"></a>TQValueListIterator::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 list. Decrementing the
iterator returned by begin() causes undefined results.
<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> <a name="operator---2"></a>TQValueListIterator::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 list. Decrementing the
iterator returned by begin() causes undefined results.
<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> & <a name="operator--eq"></a>TQValueListIterator::operator-= ( int j )
</h3>
<p> Postfix -- jumps <em>j</em> steps backward in the list. The iterator
cannot check whether it reached the beginning of the list. Jumping
past begin() causes undefined results.
<h3 class=fn>bool <a name="operator-eq-eq"></a>TQValueListIterator::operator== ( const <a href="qvaluelistiterator.html">TQValueListIterator</a><T> & it ) const
</h3>
<p> Compares this iterator and <em>it</em> and returns TRUE if they point to
the same item; otherwise returns FALSE.
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