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- BoostBook element rationale"><link rel="refentry" href="Assignable.html" title="Concept Assignable"><link rel="refentry" href="InputIterator.html" title="Concept InputIterator"><link rel="refentry" href="OutputIterator.html" title="Concept OutputIterator"><link rel="refentry" href="ForwardIterator.html" title="Concept ForwardIterator"><link rel="refentry" href="BidirectionalIterator.html" title="Concept BidirectionalIterator"><link rel="refentry" href="RandomAccessIterator.html" title="Concept RandomAccessIterator"><link rel="refentry" href="DefaultConstructible.html" title="Concept DefaultConstructible"><link rel="refentry" href="CopyConstructible.html" title="Concept CopyConstructible"><link rel="refentry" href="EqualityComparable.html" title="Concept EqualityComparable"><link rel="refentry" href="LessThanComparable.html" title="Concept LessThanComparable"><link rel="refentry" href="SignedInteger.html" title="Concept SignedInteger"><link rel="section" href="OutputIterator.html#id2551938" title="Description"><link rel="section" href="OutputIterator.html#id2551953" title="Associated types"><link rel="section" href="OutputIterator.html#id2552018" title="Notation"><link rel="section" href="OutputIterator.html#id2552071" title="Type expressions"><link rel="section" href="OutputIterator.html#id2552187" title="Valid expressions"><link rel="section" href="OutputIterator.html#id2552350" title="Complexity"><link rel="section" href="OutputIterator.html#id2552357" title="Models"><link rel="section" href="OutputIterator.html#id2552406" title="See also"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" border="1" cellpadding="2" bgcolor="#007F7F"><tr><td bgcolor="#FFFFFF"><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" width="277" height="86"></td><td><a href="../../index.htm"><font color="#FFFFFF" size="4" face="Arial">Home</font></a></td><td><a href="libraries.html"><font color="#FFFFFF" size="4" face="Arial">Libraries</font></a></td><td><a href="../../people/people.htm"><font color="#FFFFFF" size="4" face="Arial">People</font></a></td><td><a href="../../more/faq.htm"><font color="#FFFFFF" size="4" face="Arial">FAQ</font></a></td><td><a href="../../more/index.htm"><font color="#FFFFFF" size="4" face="Arial">More</font></a></td></tr></table><div class="refentry" lang="en"><a name="OutputIterator"></a><div class="titlepage"><div></div><div></div></div><div class="refnamediv"><h2><span class="refentrytitle">Concept OutputIterator</span></h2><p>OutputIterator</p></div><div class="refsect1" lang="en"><h2>Description</h2><p>An output iterator is an iterator that can write a sequence of
- values. It is single-pass (old values of the iterator cannot be
- re-used), and write-only.</p><p>An output iterator represents a position in a (possibly infinite)
- sequence. Therefore, the iterator can point into the sequence (returning
- a value when dereferenced and being incrementable), or be off-the-end
- (and not dereferenceable or incrementable).</p></div><div class="refsect1" lang="en"><h2>Associated types</h2><div class="itemizedlist"><ul type="disc"><li><p><span class="bold"><b>value_type</b></span></p><pre class="literallayout">std::iterator_traits<Iter>::value_type</pre><p>The stated value type of the iterator (should be
- <tt class="computeroutput">void</tt> for an output iterator that does not model some other
- iterator concept).</p></li><li><p><span class="bold"><b>difference_type</b></span></p><pre class="literallayout">std::iterator_traits<Iter>::difference_type</pre><p>The difference type of the iterator</p></li><li><p><span class="bold"><b>category</b></span></p><pre class="literallayout">std::iterator_traits<Iter>::iterator_category</pre><p>The category of the iterator</p></li></ul></div></div><div class="refsect1" lang="en"><h2>Notation</h2><div class="variablelist"><dl><dt><span class="term">Iter</span></dt><dd>A type playing the role of iterator-type in the <a href="OutputIterator.html" title="Concept OutputIterator">OutputIterator</a> concept.</dd><dt><span class="term">ValueType</span></dt><dd>A type playing the role of value-type in the <a href="OutputIterator.html" title="Concept OutputIterator">OutputIterator</a> concept.</dd><dt><span class="term"><tt class="varname">i</tt>, </span><span class="term"><tt class="varname">j</tt></span></dt><dd>Objects of type Iter</dd><dt><span class="term"><tt class="varname">x</tt></span></dt><dd>Object of type ValueType</dd></dl></div></div><div class="refsect1" lang="en"><h2>Type expressions</h2><div class="variablelist"><dl><dt><span class="term"></span></dt><dd><p>The type <span class="type">Iter</span> must be a model of <a href="Assignable.html" title="Concept Assignable">Assignable</a>.</p></dd><dt><span class="term"></span></dt><dd><p>The type <span class="type">ValueType</span> must be a model of <a href="Assignable.html" title="Concept Assignable">Assignable</a>.</p></dd><dt><span class="term"></span></dt><dd><p>The type <span class="type">Iter</span> must be a model of <a href="DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a>.</p></dd><dt><span class="term"></span></dt><dd><p>The type <span class="type">Iter</span> must be a model of
- <a href="EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a>.</p></dd><dt><span class="term">Category tag</span></dt><dd><p><span class="type">category</span> must be
- derived from <span class="type">std::output_iterator_tag</span>, a model of <a href="DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a>, and a model of <a href="CopyConstructible.html" title="Concept CopyConstructible">CopyConstructible</a>.
- </p></dd><dt><span class="term">Difference type properties</span></dt><dd><p><span class="type">difference_type</span> must be
- a model of <a href="SignedInteger.html" title="Concept SignedInteger">SignedInteger</a>.
- </p></dd></dl></div></div><div class="refsect1" lang="en"><h2>Valid expressions</h2><div class="informaltable"><table border="1"><colgroup><col><col><col><col><col><col></colgroup><thead><tr><th>Name</th><th>Expression</th><th>Type</th><th>Precondition</th><th>Semantics</th><th>Postcondition</th></tr></thead><tbody><tr><td><p>Dereference</p></td><td><p>*i</p></td><td><p></p></td><td><p><tt class="computeroutput">i</tt> is incrementable (not
- off-the-end)</p></td><td> </td><td> </td></tr><tr><td><p>Dereference and assign</p></td><td><p>*i = x</p></td><td><p></p></td><td><p><tt class="computeroutput">i</tt> is incrementable (not
- off-the-end)</p></td><td> </td><td><p><tt class="computeroutput">*i</tt> may not be written to again until it has
- been incremented.</p></td></tr><tr><td><p>Preincrement</p></td><td><p>++i</p></td><td><p><span class="type">Iter &</span></p></td><td><p><tt class="computeroutput">i</tt> is incrementable (not
- off-the-end)</p></td><td> </td><td> </td></tr><tr><td><p>Postincrement</p></td><td><p>i++</p></td><td><p></p></td><td><p><tt class="computeroutput">i</tt> is incrementable (not
- off-the-end)</p></td><td><p>Equivalent to <tt class="computeroutput">(void)(++i)</tt></p></td><td><p><tt class="computeroutput">i</tt> is dereferenceable or
- off-the-end</p></td></tr><tr><td><p>Postincrement, dereference, and assign</p></td><td><p>*i++ = x</p></td><td><p></p></td><td><p><tt class="computeroutput">i</tt> is incrementable (not
- off-the-end)</p></td><td><p>Equivalent to <tt class="computeroutput">{*i = t; ++i;}</tt></p></td><td><p><tt class="computeroutput">i</tt> is dereferenceable or
- off-the-end</p></td></tr></tbody></table></div></div><div class="refsect1" lang="en"><h2>Complexity</h2><p>
- All iterator operations must take amortized constant time.
- </p></div><div class="refsect1" lang="en"><h2>Models</h2><div class="itemizedlist"><ul type="disc"><li><span class="simplelist"><span class="type">std::ostream_iterator</span>, <span class="type">...</span></span></li><li><span class="simplelist"><span class="type">std::insert_iterator</span>, <span class="type">...</span></span></li><li><span class="simplelist"><span class="type">std::front_insert_iterator</span>, <span class="type">...</span></span></li><li><span class="simplelist"><span class="type">std::back_insert_iterator</span>, <span class="type">...</span></span></li></ul></div></div><div class="refsect1" lang="en"><h2>See also</h2><div class="itemizedlist"><ul type="disc"></ul></div></div></div><table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr><td align="left"><small>Last revised: , at GMT</small></td><td align="right"><small>Copyright © 2001, 2002 Indiana University<br>Copyright © 2000, 2001 University of Notre Dame du Lac<br>Copyright © 2000 Jeremy Siek, Lie-Quan Lee, Andrew Lumsdaine<br>Copyright © 1996-1999 Silicon Graphics Computer Systems, Inc.<br>Copyright © 1994 Hewlett-Packard Company</small></td></tr></table><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="InputIterator.html"><img src="images/prev.png" alt="Prev"></a> </td><td width="20%" align="center"><a accesskey="u" href="index.html#concepts.reference"><img src="images/up.png" alt="Up"></a></td><td width="40%" align="right"> <a accesskey="n" href="ForwardIterator.html"><img src="images/next.png" alt="Next"></a></td></tr><tr><td width="40%" align="left" valign="top">Concept InputIterator </td><td width="20%" align="center"><a accesskey="h" href="index.html"><img src="images/home.png" alt="Home"></a></td><td width="40%" align="right" valign="top"> Concept ForwardIterator</td></tr></table></div></body></html>
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