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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="iterator.utilities"></a><a class="link" href="utilities.html" title="Utilities">Utilities</a>
</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="utilities.html#iterator.utilities.archetypes">Iterator Archetypes</a></span></dt>
<dt><span class="section"><a href="utilities/concept_checking.html">Concept Checking</a></span></dt>
<dt><span class="section"><a href="utilities/traits.html">Iterator Traits</a></span></dt>
<dt><span class="section"><a href="utilities/utilities.html">Iterator Utilities</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="utilities/utilities.html#iterator.utilities.utilities.utilities_traits">Traits</a></span></dt>
<dt><span class="section"><a href="utilities/utilities/utilities_testing.html">Testing
and Concept Checking</a></span></dt>
</dl></dd>
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<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="iterator.utilities.archetypes"></a><a class="link" href="utilities.html#iterator.utilities.archetypes" title="Iterator Archetypes">Iterator Archetypes</a>
</h3></div></div></div>
<p>
The <code class="computeroutput"><span class="identifier">iterator_archetype</span></code> class
constructs a minimal implementation of one of the iterator access concepts
and one of the iterator traversal concepts. This is used for doing a compile-time
check to see if a the type requirements of a template are really enough to
cover the implementation of the template. For further information see the
documentation for the |concepts|_ library.
</p>
<h3>
<a name="iterator.utilities.archetypes.h0"></a>
<span class="phrase"><a name="iterator.utilities.archetypes.synopsis"></a></span><a class="link" href="utilities.html#iterator.utilities.archetypes.synopsis">Synopsis</a>
</h3>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">iterator_archetypes</span>
<span class="special">{</span>
<span class="comment">// Access categories</span>
<span class="keyword">typedef</span> <span class="comment">/*implementation defined*/</span> <span class="identifier">readable_iterator_t</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="comment">/*implementation defined*/</span> <span class="identifier">writable_iterator_t</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="comment">/*implementation defined*/</span> <span class="identifier">readable_writable_iterator_t</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="comment">/*implementation defined*/</span> <span class="identifier">readable_lvalue_iterator_t</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="comment">/*implementation defined*/</span> <span class="identifier">writable_lvalue_iterator_t</span><span class="special">;</span>
<span class="special">}</span>
<span class="keyword">template</span> <span class="special">&lt;</span>
<span class="keyword">class</span> <span class="identifier">Value</span>
<span class="special">,</span> <span class="keyword">class</span> <span class="identifier">AccessCategory</span>
<span class="special">,</span> <span class="keyword">class</span> <span class="identifier">TraversalCategory</span>
<span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">iterator_archetype</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="comment">/* see below */</span> <span class="identifier">value_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="comment">/* see below */</span> <span class="identifier">reference</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="comment">/* see below */</span> <span class="identifier">pointer</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="comment">/* see below */</span> <span class="identifier">difference_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="comment">/* see below */</span> <span class="identifier">iterator_category</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<h4>
<a name="iterator.utilities.archetypes.h1"></a>
<span class="phrase"><a name="iterator.utilities.archetypes.access_category_tags"></a></span><a class="link" href="utilities.html#iterator.utilities.archetypes.access_category_tags">Access
Category Tags</a>
</h4>
<p>
The access category types provided correspond to the following standard iterator
access concept combinations:
</p>
<pre class="programlisting"><span class="identifier">readable_iterator_t</span> <span class="special">:=</span>
<span class="identifier">Readable</span> <span class="identifier">Iterator</span>
<span class="identifier">writable_iterator_t</span> <span class="special">:=</span>
<span class="identifier">Writeable</span> <span class="identifier">Iterator</span>
<span class="identifier">readable_writable_iterator_t</span> <span class="special">:=</span>
<span class="identifier">Readable</span> <span class="identifier">Iterator</span> <span class="special">&amp;</span> <span class="identifier">Writeable</span> <span class="identifier">Iterator</span> <span class="special">&amp;</span> <span class="identifier">Swappable</span> <span class="identifier">Iterator</span>
<span class="identifier">readable_lvalue_iterator_t</span> <span class="special">:=</span>
<span class="identifier">Readable</span> <span class="identifier">Iterator</span> <span class="special">&amp;</span> <span class="identifier">Lvalue</span> <span class="identifier">Iterator</span>
<span class="identifier">writeable_lvalue_iterator_t</span> <span class="special">:=</span>
<span class="identifier">Readable</span> <span class="identifier">Iterator</span> <span class="special">&amp;</span> <span class="identifier">Writeable</span> <span class="identifier">Iterator</span> <span class="special">&amp;</span> <span class="identifier">Swappable</span> <span class="identifier">Iterator</span> <span class="special">&amp;</span> <span class="identifier">Lvalue</span> <span class="identifier">Iterator</span>
</pre>
<h4>
<a name="iterator.utilities.archetypes.h2"></a>
<span class="phrase"><a name="iterator.utilities.archetypes.traits"></a></span><a class="link" href="utilities.html#iterator.utilities.archetypes.traits">Traits</a>
</h4>
<p>
The nested trait types are defined as follows:
</p>
<pre class="programlisting"><span class="keyword">if</span> <span class="special">(</span><span class="identifier">AccessCategory</span> <span class="special">==</span> <span class="identifier">readable_iterator_t</span><span class="special">)</span>
<span class="identifier">value_type</span> <span class="special">=</span> <span class="identifier">Value</span>
<span class="identifier">reference</span> <span class="special">=</span> <span class="identifier">Value</span>
<span class="identifier">pointer</span> <span class="special">=</span> <span class="identifier">Value</span><span class="special">*</span>
<span class="keyword">else</span> <span class="keyword">if</span> <span class="special">(</span><span class="identifier">AccessCategory</span> <span class="special">==</span> <span class="identifier">writable_iterator_t</span><span class="special">)</span>
<span class="identifier">value_type</span> <span class="special">=</span> <span class="keyword">void</span>
<span class="identifier">reference</span> <span class="special">=</span> <span class="keyword">void</span>
<span class="identifier">pointer</span> <span class="special">=</span> <span class="keyword">void</span>
<span class="keyword">else</span> <span class="keyword">if</span> <span class="special">(</span><span class="identifier">AccessCategory</span> <span class="special">==</span> <span class="identifier">readable_writable_iterator_t</span><span class="special">)</span>
<span class="identifier">value_type</span> <span class="special">=</span> <span class="identifier">Value</span>
<span class="identifier">reference</span> <span class="special">:=</span>
<span class="identifier">A</span> <span class="identifier">type</span> <span class="identifier">X</span> <span class="identifier">that</span> <span class="identifier">is</span> <span class="identifier">convertible</span> <span class="identifier">to</span> <span class="identifier">Value</span> <span class="keyword">for</span> <span class="identifier">which</span> <span class="identifier">the</span> <span class="identifier">following</span>
<span class="identifier">expression</span> <span class="identifier">is</span> <span class="identifier">valid</span><span class="special">.</span> <span class="identifier">Given</span> <span class="identifier">an</span> <span class="identifier">object</span> <span class="identifier">x</span> <span class="identifier">of</span> <span class="identifier">type</span> <span class="identifier">X</span> <span class="keyword">and</span> <span class="identifier">v</span> <span class="identifier">of</span> <span class="identifier">type</span>
<span class="identifier">Value</span><span class="special">.</span>
<span class="identifier">x</span> <span class="special">=</span> <span class="identifier">v</span>
<span class="identifier">pointer</span> <span class="special">=</span> <span class="identifier">Value</span><span class="special">*</span>
<span class="keyword">else</span> <span class="keyword">if</span> <span class="special">(</span><span class="identifier">AccessCategory</span> <span class="special">==</span> <span class="identifier">readable_lvalue_iterator_t</span><span class="special">)</span>
<span class="identifier">value_type</span> <span class="special">=</span> <span class="identifier">Value</span>
<span class="identifier">reference</span> <span class="special">=</span> <span class="identifier">Value</span> <span class="keyword">const</span><span class="special">&amp;</span>
<span class="identifier">pointer</span> <span class="special">=</span> <span class="identifier">Value</span> <span class="keyword">const</span><span class="special">*</span>
<span class="keyword">else</span> <span class="keyword">if</span> <span class="special">(</span><span class="identifier">AccessCategory</span> <span class="special">==</span> <span class="identifier">writable_lvalue_iterator_t</span><span class="special">)</span>
<span class="identifier">value_type</span> <span class="special">=</span> <span class="identifier">Value</span>
<span class="identifier">reference</span> <span class="special">=</span> <span class="identifier">Value</span><span class="special">&amp;</span>
<span class="identifier">pointer</span> <span class="special">=</span> <span class="identifier">Value</span><span class="special">*</span>
<span class="keyword">if</span> <span class="special">(</span> <span class="identifier">TraversalCategory</span> <span class="identifier">is</span> <span class="identifier">convertible</span> <span class="identifier">to</span> <span class="identifier">forward_traversal_tag</span> <span class="special">)</span>
<span class="identifier">difference_type</span> <span class="special">:=</span> <span class="identifier">ptrdiff_t</span>
<span class="keyword">else</span>
<span class="identifier">difference_type</span> <span class="special">:=</span> <span class="identifier">unspecified</span> <span class="identifier">type</span>
<span class="identifier">iterator_category</span> <span class="special">:=</span>
<span class="identifier">A</span> <span class="identifier">type</span> <span class="identifier">X</span> <span class="identifier">satisfying</span> <span class="identifier">the</span> <span class="identifier">following</span> <span class="identifier">two</span> <span class="identifier">constraints</span><span class="special">:</span>
<span class="number">1.</span> <span class="identifier">X</span> <span class="identifier">is</span> <span class="identifier">convertible</span> <span class="identifier">to</span> <span class="identifier">X1</span><span class="special">,</span> <span class="keyword">and</span> <span class="keyword">not</span> <span class="identifier">to</span> <span class="identifier">any</span> <span class="identifier">more</span><span class="special">-</span><span class="identifier">derived</span>
<span class="identifier">type</span><span class="special">,</span> <span class="identifier">where</span> <span class="identifier">X1</span> <span class="identifier">is</span> <span class="identifier">defined</span> <span class="identifier">by</span><span class="special">:</span>
<span class="keyword">if</span> <span class="special">(</span><span class="identifier">reference</span> <span class="identifier">is</span> <span class="identifier">a</span> <span class="identifier">reference</span> <span class="identifier">type</span>
<span class="special">&amp;&amp;</span> <span class="identifier">TraversalCategory</span> <span class="identifier">is</span> <span class="identifier">convertible</span> <span class="identifier">to</span> <span class="identifier">forward_traversal_tag</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">if</span> <span class="special">(</span><span class="identifier">TraversalCategory</span> <span class="identifier">is</span> <span class="identifier">convertible</span> <span class="identifier">to</span> <span class="identifier">random_access_traversal_tag</span><span class="special">)</span>
<span class="identifier">X1</span> <span class="special">=</span> <span class="identifier">random_access_iterator_tag</span>
<span class="keyword">else</span> <span class="keyword">if</span> <span class="special">(</span><span class="identifier">TraversalCategory</span> <span class="identifier">is</span> <span class="identifier">convertible</span> <span class="identifier">to</span> <span class="identifier">bidirectional_traversal_tag</span><span class="special">)</span>
<span class="identifier">X1</span> <span class="special">=</span> <span class="identifier">bidirectional_iterator_tag</span>
<span class="keyword">else</span>
<span class="identifier">X1</span> <span class="special">=</span> <span class="identifier">forward_iterator_tag</span>
<span class="special">}</span>
<span class="keyword">else</span>
<span class="special">{</span>
<span class="keyword">if</span> <span class="special">(</span><span class="identifier">TraversalCategory</span> <span class="identifier">is</span> <span class="identifier">convertible</span> <span class="identifier">to</span> <span class="identifier">single_pass_traversal_tag</span>
<span class="special">&amp;&amp;</span> <span class="identifier">reference</span> <span class="special">!=</span> <span class="keyword">void</span><span class="special">)</span>
<span class="identifier">X1</span> <span class="special">=</span> <span class="identifier">input_iterator_tag</span>
<span class="keyword">else</span>
<span class="identifier">X1</span> <span class="special">=</span> <span class="identifier">output_iterator_tag</span>
<span class="special">}</span>
<span class="number">2.</span> <span class="identifier">X</span> <span class="identifier">is</span> <span class="identifier">convertible</span> <span class="identifier">to</span> <span class="identifier">TraversalCategory</span>
</pre>
<h3>
<a name="iterator.utilities.archetypes.h3"></a>
<span class="phrase"><a name="iterator.utilities.archetypes.requirements"></a></span><a class="link" href="utilities.html#iterator.utilities.archetypes.requirements">Requirements</a>
</h3>
<p>
The <code class="computeroutput"><span class="identifier">AccessCategory</span></code> argument
must be one of the predefined access category tags. The <code class="computeroutput"><span class="identifier">TraversalCategory</span></code>
must be one of the standard traversal tags. The <code class="computeroutput"><span class="identifier">Value</span></code>
type must satisfy the requirements of the iterator concept specified by
<code class="computeroutput"><span class="identifier">AccessCategory</span></code> and <code class="computeroutput"><span class="identifier">TraversalCategory</span></code> as implied by the nested
traits types.
</p>
<h3>
<a name="iterator.utilities.archetypes.h4"></a>
<span class="phrase"><a name="iterator.utilities.archetypes.concepts"></a></span><a class="link" href="utilities.html#iterator.utilities.archetypes.concepts">Concepts</a>
</h3>
<p>
<code class="computeroutput"><span class="identifier">iterator_archetype</span></code> models
the iterator concepts specified by the <code class="computeroutput"><span class="identifier">AccessCategory</span></code>
and <code class="computeroutput"><span class="identifier">TraversalCategory</span></code> arguments.
<code class="computeroutput"><span class="identifier">iterator_archetype</span></code> does not
model any other access concepts or any more derived traversal concepts.
</p>
</div>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2003, 2005 David Abrahams Jeremy Siek Thomas
Witt<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at &lt;ulink url="http://www.boost.org/LICENSE_1_0.txt"&gt;
http://www.boost.org/LICENSE_1_0.txt &lt;/ulink&gt;)
</p>
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