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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="iterator.specialized"></a><a class="link" href="specialized.html" title="Specialized Adaptors">Specialized Adaptors</a>
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</h2></div></div></div>
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<div class="toc"><dl class="toc">
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<dt><span class="section"><a href="specialized.html#iterator.specialized.counting">Counting Iterator</a></span></dt>
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<dt><span class="section"><a href="specialized/filter.html">Filter Iterator</a></span></dt>
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<dt><span class="section"><a href="specialized/function_output.html">Function Output
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Iterator</a></span></dt>
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<dt><span class="section"><a href="specialized/indirect.html">Indirect Iterator</a></span></dt>
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<dt><span class="section"><a href="specialized/permutation.html">Permutation Iterator</a></span></dt>
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<dt><span class="section"><a href="specialized/reverse.html">Reverse Iterator</a></span></dt>
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<dt><span class="section"><a href="specialized/shared_container.html">Shared Container
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Iterator</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="specialized/shared_container.html#iterator.specialized.shared_container.shared_container_type">The
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Shared Container Iterator Type</a></span></dt>
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<dt><span class="section"><a href="specialized/shared_container/shared_container_object_generator.html">The
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Shared Container Iterator Object Generator</a></span></dt>
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<dt><span class="section"><a href="specialized/shared_container/shared_container_generator.html">The
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Shared Container Iterator Range Generator</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="specialized/transform.html">Transform Iterator</a></span></dt>
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<dt><span class="section"><a href="specialized/zip.html">Zip Iterator</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="specialized/zip.html#iterator.specialized.zip.zip_example">Example</a></span></dt>
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<dt><span class="section"><a href="specialized/zip/zip_reference.html">Reference</a></span></dt>
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</dl></dd>
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</dl></div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="iterator.specialized.counting"></a><a class="link" href="specialized.html#iterator.specialized.counting" title="Counting Iterator">Counting Iterator</a>
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</h3></div></div></div>
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<p>
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A <code class="computeroutput"><span class="identifier">counting_iterator</span></code> adapts
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an object by adding an <code class="computeroutput"><span class="keyword">operator</span><span class="special">*</span></code> that returns the current value of the object.
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All other iterator operations are forwarded to the adapted object.
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</p>
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<h3>
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<a name="iterator.specialized.counting.h0"></a>
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<span class="phrase"><a name="iterator.specialized.counting.example"></a></span><a class="link" href="specialized.html#iterator.specialized.counting.example">Example</a>
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</h3>
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<p>
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This example fills an array with numbers and a second array with pointers
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into the first array, using <code class="computeroutput"><span class="identifier">counting_iterator</span></code>
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for both tasks. Finally <code class="computeroutput"><span class="identifier">indirect_iterator</span></code>
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is used to print out the numbers into the first array via indirection through
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the second array.
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</p>
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<pre class="programlisting"><span class="keyword">int</span> <span class="identifier">N</span> <span class="special">=</span> <span class="number">7</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">numbers</span><span class="special">;</span>
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<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">>::</span><span class="identifier">iterator</span> <span class="identifier">n_iter</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">counting_iterator</span><span class="special"><</span><span class="keyword">int</span><span class="special">>(</span><span class="number">0</span><span class="special">),</span>
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<span class="identifier">boost</span><span class="special">::</span><span class="identifier">counting_iterator</span><span class="special"><</span><span class="keyword">int</span><span class="special">>(</span><span class="identifier">N</span><span class="special">),</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">numbers</span><span class="special">));</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">>::</span><span class="identifier">iterator</span><span class="special">></span> <span class="identifier">pointers</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">make_counting_iterator</span><span class="special">(</span><span class="identifier">numbers</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span>
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<span class="identifier">boost</span><span class="special">::</span><span class="identifier">make_counting_iterator</span><span class="special">(</span><span class="identifier">numbers</span><span class="special">.</span><span class="identifier">end</span><span class="special">()),</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">pointers</span><span class="special">));</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"indirectly printing out the numbers from 0 to "</span>
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<span class="special"><<</span> <span class="identifier">N</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">make_indirect_iterator</span><span class="special">(</span><span class="identifier">pointers</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span>
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<span class="identifier">boost</span><span class="special">::</span><span class="identifier">make_indirect_iterator</span><span class="special">(</span><span class="identifier">pointers</span><span class="special">.</span><span class="identifier">end</span><span class="special">()),</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream_iterator</span><span class="special"><</span><span class="keyword">int</span><span class="special">>(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="string">" "</span><span class="special">));</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
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</pre>
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<p>
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The output is:
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</p>
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<pre class="programlisting"><span class="identifier">indirectly</span> <span class="identifier">printing</span> <span class="identifier">out</span> <span class="identifier">the</span> <span class="identifier">numbers</span> <span class="identifier">from</span> <span class="number">0</span> <span class="identifier">to</span> <span class="number">7</span>
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<span class="number">0</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span> <span class="number">6</span>
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</pre>
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<p>
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The source code for this example can be found <a href="../../example/counting_iterator_example.cpp" target="_top">here</a>.
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</p>
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<h3>
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<a name="iterator.specialized.counting.h1"></a>
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<span class="phrase"><a name="iterator.specialized.counting.reference"></a></span><a class="link" href="specialized.html#iterator.specialized.counting.reference">Reference</a>
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</h3>
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<h4>
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<a name="iterator.specialized.counting.h2"></a>
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<span class="phrase"><a name="iterator.specialized.counting.synopsis"></a></span><a class="link" href="specialized.html#iterator.specialized.counting.synopsis">Synopsis</a>
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</h4>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span>
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<span class="keyword">class</span> <span class="identifier">Incrementable</span>
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<span class="special">,</span> <span class="keyword">class</span> <span class="identifier">CategoryOrTraversal</span> <span class="special">=</span> <span class="identifier">use_default</span>
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<span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Difference</span> <span class="special">=</span> <span class="identifier">use_default</span>
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<span class="special">></span>
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<span class="keyword">class</span> <span class="identifier">counting_iterator</span>
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<span class="special">{</span>
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<span class="keyword">public</span><span class="special">:</span>
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<span class="keyword">typedef</span> <span class="identifier">Incrementable</span> <span class="identifier">value_type</span><span class="special">;</span>
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<span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">Incrementable</span><span class="special">&</span> <span class="identifier">reference</span><span class="special">;</span>
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<span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">Incrementable</span><span class="special">*</span> <span class="identifier">pointer</span><span class="special">;</span>
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<span class="keyword">typedef</span> <span class="comment">/* see below */</span> <span class="identifier">difference_type</span><span class="special">;</span>
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<span class="keyword">typedef</span> <span class="comment">/* see below */</span> <span class="identifier">iterator_category</span><span class="special">;</span>
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<span class="identifier">counting_iterator</span><span class="special">();</span>
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<span class="identifier">counting_iterator</span><span class="special">(</span><span class="identifier">counting_iterator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">rhs</span><span class="special">);</span>
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<span class="keyword">explicit</span> <span class="identifier">counting_iterator</span><span class="special">(</span><span class="identifier">Incrementable</span> <span class="identifier">x</span><span class="special">);</span>
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<span class="identifier">Incrementable</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">base</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
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<span class="identifier">reference</span> <span class="keyword">operator</span><span class="special">*()</span> <span class="keyword">const</span><span class="special">;</span>
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<span class="identifier">counting_iterator</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">++();</span>
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<span class="identifier">counting_iterator</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">--();</span>
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<span class="keyword">private</span><span class="special">:</span>
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<span class="identifier">Incrementable</span> <span class="identifier">m_inc</span><span class="special">;</span> <span class="comment">// exposition</span>
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<span class="special">};</span>
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</pre>
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<p>
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If the <code class="computeroutput"><span class="identifier">Difference</span></code> argument
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is <code class="computeroutput"><span class="identifier">use_default</span></code> then <code class="computeroutput"><span class="identifier">difference_type</span></code> is an unspecified signed
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integral type. Otherwise <code class="computeroutput"><span class="identifier">difference_type</span></code>
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is <code class="computeroutput"><span class="identifier">Difference</span></code>.
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</p>
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<p>
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<code class="computeroutput"><span class="identifier">iterator_category</span></code> is determined
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according to the following algorithm:
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</p>
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<pre class="programlisting"><span class="keyword">if</span> <span class="special">(</span><span class="identifier">CategoryOrTraversal</span> <span class="identifier">is</span> <span class="keyword">not</span> <span class="identifier">use_default</span><span class="special">)</span>
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<span class="keyword">return</span> <span class="identifier">CategoryOrTraversal</span>
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<span class="keyword">else</span> <span class="keyword">if</span> <span class="special">(</span><span class="identifier">numeric_limits</span><span class="special"><</span><span class="identifier">Incrementable</span><span class="special">>::</span><span class="identifier">is_specialized</span><span class="special">)</span>
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<span class="keyword">return</span> <span class="special">|</span><span class="identifier">iterator</span><span class="special">-</span><span class="identifier">category</span><span class="special">|</span><span class="identifier">_</span><span class="special">\</span> <span class="special">(</span>
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<span class="identifier">random_access_traversal_tag</span><span class="special">,</span> <span class="identifier">Incrementable</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Incrementable</span><span class="special">&)</span>
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<span class="keyword">else</span>
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<span class="keyword">return</span> <span class="special">|</span><span class="identifier">iterator</span><span class="special">-</span><span class="identifier">category</span><span class="special">|</span><span class="identifier">_</span><span class="special">\</span> <span class="special">(</span>
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<span class="identifier">iterator_traversal</span><span class="special"><</span><span class="identifier">Incrementable</span><span class="special">>::</span><span class="identifier">type</span><span class="special">,</span>
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<span class="identifier">Incrementable</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Incrementable</span><span class="special">&)</span>
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</pre>
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<div class="sidebar">
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<div class="titlepage"><div><div><p class="title"><b></b></p></div></div></div>
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<p>
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<span class="bold"><strong>Note:</strong></span> implementers are encouraged to provide
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an implementation of <code class="computeroutput"><span class="keyword">operator</span><span class="special">-</span></code> and a <code class="computeroutput"><span class="identifier">difference_type</span></code>
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that avoids overflows in the cases where <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special"><</span><span class="identifier">Incrementable</span><span class="special">>::</span><span class="identifier">is_specialized</span></code>
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is true.
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</p>
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</div>
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<h4>
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<a name="iterator.specialized.counting.h3"></a>
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<span class="phrase"><a name="iterator.specialized.counting.requirements"></a></span><a class="link" href="specialized.html#iterator.specialized.counting.requirements">Requirements</a>
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</h4>
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<p>
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The <code class="computeroutput"><span class="identifier">Incrementable</span></code> argument
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shall be Copy Constructible and Assignable.
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</p>
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<p>
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If <code class="computeroutput"><span class="identifier">iterator_category</span></code> is convertible
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to <code class="computeroutput"><span class="identifier">forward_iterator_tag</span></code> or
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<code class="computeroutput"><span class="identifier">forward_traversal_tag</span></code>, the
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following must be well-formed:
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</p>
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<pre class="programlisting"><span class="identifier">Incrementable</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">j</span><span class="special">;</span>
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<span class="special">++</span><span class="identifier">i</span><span class="special">;</span> <span class="comment">// pre-increment</span>
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<span class="identifier">i</span> <span class="special">==</span> <span class="identifier">j</span><span class="special">;</span> <span class="comment">// operator equal</span>
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</pre>
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<p>
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If <code class="computeroutput"><span class="identifier">iterator_category</span></code> is convertible
|
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to <code class="computeroutput"><span class="identifier">bidirectional_iterator_tag</span></code>
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or <code class="computeroutput"><span class="identifier">bidirectional_traversal_tag</span></code>,
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the following expression must also be well-formed:
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</p>
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<pre class="programlisting"><span class="special">--</span><span class="identifier">i</span>
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</pre>
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<p>
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If <code class="computeroutput"><span class="identifier">iterator_category</span></code> is convertible
|
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to <code class="computeroutput"><span class="identifier">random_access_iterator_tag</span></code>
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or <code class="computeroutput"><span class="identifier">random_access_traversal_tag</span></code>,
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the following must must also be valid:
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</p>
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<pre class="programlisting"><span class="identifier">counting_iterator</span><span class="special">::</span><span class="identifier">difference_type</span> <span class="identifier">n</span><span class="special">;</span>
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<span class="identifier">i</span> <span class="special">+=</span> <span class="identifier">n</span><span class="special">;</span>
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<span class="identifier">n</span> <span class="special">=</span> <span class="identifier">i</span> <span class="special">-</span> <span class="identifier">j</span><span class="special">;</span>
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<span class="identifier">i</span> <span class="special"><</span> <span class="identifier">j</span><span class="special">;</span>
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</pre>
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<h4>
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<a name="iterator.specialized.counting.h4"></a>
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<span class="phrase"><a name="iterator.specialized.counting.concepts"></a></span><a class="link" href="specialized.html#iterator.specialized.counting.concepts">Concepts</a>
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</h4>
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<p>
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Specializations of <code class="computeroutput"><span class="identifier">counting_iterator</span></code>
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model Readable Lvalue Iterator. In addition, they model the concepts corresponding
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to the iterator tags to which their <code class="computeroutput"><span class="identifier">iterator_category</span></code>
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is convertible. Also, if <code class="computeroutput"><span class="identifier">CategoryOrTraversal</span></code>
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is not <code class="computeroutput"><span class="identifier">use_default</span></code> then
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<code class="computeroutput"><span class="identifier">counting_iterator</span></code> models
|
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the concept corresponding to the iterator tag <code class="computeroutput"><span class="identifier">CategoryOrTraversal</span></code>.
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Otherwise, if <code class="computeroutput"><span class="identifier">numeric_limits</span><span class="special"><</span><span class="identifier">Incrementable</span><span class="special">>::</span><span class="identifier">is_specialized</span></code>,
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then <code class="computeroutput"><span class="identifier">counting_iterator</span></code> models
|
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Random Access Traversal Iterator. Otherwise, <code class="computeroutput"><span class="identifier">counting_iterator</span></code>
|
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models the same iterator traversal concepts modeled by <code class="computeroutput"><span class="identifier">Incrementable</span></code>.
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</p>
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<p>
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<code class="computeroutput"><span class="identifier">counting_iterator</span><span class="special"><</span><span class="identifier">X</span><span class="special">,</span><span class="identifier">C1</span><span class="special">,</span><span class="identifier">D1</span><span class="special">></span></code>
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is interoperable with <code class="computeroutput"><span class="identifier">counting_iterator</span><span class="special"><</span><span class="identifier">Y</span><span class="special">,</span><span class="identifier">C2</span><span class="special">,</span><span class="identifier">D2</span><span class="special">></span></code> if and only if <code class="computeroutput"><span class="identifier">X</span></code>
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is interoperable with <code class="computeroutput"><span class="identifier">Y</span></code>.
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</p>
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<h4>
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<a name="iterator.specialized.counting.h5"></a>
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<span class="phrase"><a name="iterator.specialized.counting.operations"></a></span><a class="link" href="specialized.html#iterator.specialized.counting.operations">Operations</a>
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</h4>
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<p>
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In addition to the operations required by the concepts modeled by <code class="computeroutput"><span class="identifier">counting_iterator</span></code>, <code class="computeroutput"><span class="identifier">counting_iterator</span></code>
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provides the following operations.
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</p>
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<pre class="programlisting"><span class="identifier">counting_iterator</span><span class="special">();</span>
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</pre>
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<p>
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<span class="bold"><strong>Requires: </strong></span> <code class="computeroutput"><span class="identifier">Incrementable</span></code>
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|
is Default Constructible.<br> <span class="bold"><strong>Effects: </strong></span>
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Default construct the member <code class="computeroutput"><span class="identifier">m_inc</span></code>.
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</p>
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<pre class="programlisting"><span class="identifier">counting_iterator</span><span class="special">(</span><span class="identifier">counting_iterator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">rhs</span><span class="special">);</span>
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|
</pre>
|
|
<p>
|
|
<span class="bold"><strong>Effects: </strong></span> Construct member <code class="computeroutput"><span class="identifier">m_inc</span></code> from <code class="computeroutput"><span class="identifier">rhs</span><span class="special">.</span><span class="identifier">m_inc</span></code>.
|
|
</p>
|
|
<pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">counting_iterator</span><span class="special">(</span><span class="identifier">Incrementable</span> <span class="identifier">x</span><span class="special">);</span>
|
|
</pre>
|
|
<p>
|
|
<span class="bold"><strong>Effects: </strong></span> Construct member <code class="computeroutput"><span class="identifier">m_inc</span></code> from <code class="computeroutput"><span class="identifier">x</span></code>.
|
|
</p>
|
|
<pre class="programlisting"><span class="identifier">reference</span> <span class="keyword">operator</span><span class="special">*()</span> <span class="keyword">const</span><span class="special">;</span>
|
|
</pre>
|
|
<p>
|
|
<span class="bold"><strong>Returns: </strong></span> <code class="computeroutput"><span class="identifier">m_inc</span></code>
|
|
</p>
|
|
<pre class="programlisting"><span class="identifier">counting_iterator</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">++();</span>
|
|
</pre>
|
|
<p>
|
|
<span class="bold"><strong>Effects: </strong></span> <code class="computeroutput"><span class="special">++</span><span class="identifier">m_inc</span></code><br> <span class="bold"><strong>Returns:
|
|
</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>
|
|
</p>
|
|
<pre class="programlisting"><span class="identifier">counting_iterator</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">--();</span>
|
|
</pre>
|
|
<p>
|
|
<span class="bold"><strong>Effects: </strong></span> <code class="computeroutput"><span class="special">--</span><span class="identifier">m_inc</span></code><br> <span class="bold"><strong>Returns:
|
|
</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>
|
|
</p>
|
|
<pre class="programlisting"><span class="identifier">Incrementable</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">base</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
|
|
</pre>
|
|
<p>
|
|
<span class="bold"><strong>Returns: </strong></span> <code class="computeroutput"><span class="identifier">m_inc</span></code>
|
|
</p>
|
|
</div>
|
|
</div>
|
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
|
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<td align="right"><div class="copyright-footer">Copyright © 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 <ulink url="http://www.boost.org/LICENSE_1_0.txt">
|
|
http://www.boost.org/LICENSE_1_0.txt </ulink>)
|
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</p>
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</div></td>
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</tr></table>
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