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| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="range.reference.adaptors.reference.indexed"></a><a class="link" href="indexed.html" title="indexed"> indexed</a> |
| </h5></div></div></div> |
| <div class="toc"><dl><dt><span class="section"><a href="indexed.html#range.reference.adaptors.reference.indexed.indexed_example"> |
| indexed example</a></span></dt></dl></div> |
| <div class="informaltable"><table class="table"> |
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| Syntax |
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| Pipe |
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| <p> |
| <code class="computeroutput"><span class="identifier">rng</span> <span class="special">|</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">adaptors</span><span class="special">::</span><span class="identifier">indexed</span></code> |
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| <p> |
| Function |
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| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">adaptors</span><span class="special">::</span><span class="identifier">index</span><span class="special">(</span><span class="identifier">rng</span><span class="special">)</span></code> |
| </p> |
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| </tbody> |
| </table></div> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <span class="bold"><strong>Returns:</strong></span> A range adapted to return |
| both the element and the associated index. The returned range consists |
| of iterators that have in addition to the usual iterator member functions |
| an <code class="computeroutput"><span class="identifier">index</span><span class="special">()</span></code> |
| member function that returns the appropriate index for the element |
| in the sequence corresponding with the iterator. |
| </li> |
| <li class="listitem"> |
| <span class="bold"><strong>Range Category:</strong></span> <a class="link" href="../../../concepts/single_pass_range.html" title="Single Pass Range">Single |
| Pass Range</a> |
| </li> |
| <li class="listitem"> |
| <span class="bold"><strong>Returned Range Category:</strong></span> The range |
| category of <code class="computeroutput"><span class="identifier">rng</span></code> |
| </li> |
| </ul></div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h6 class="title"> |
| <a name="range.reference.adaptors.reference.indexed.indexed_example"></a><a class="link" href="indexed.html#range.reference.adaptors.reference.indexed.indexed_example" title="indexed example"> |
| indexed example</a> |
| </h6></div></div></div> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">adaptor</span><span class="special">/</span><span class="identifier">indexed</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">copy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">assign</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">algorithm</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span> |
| |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Iterator</span><span class="special">></span> |
| <span class="keyword">void</span> <span class="identifier">display_element_and_index</span><span class="special">(</span><span class="identifier">Iterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">last</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="keyword">for</span> <span class="special">(</span><span class="identifier">Iterator</span> <span class="identifier">it</span> <span class="special">=</span> <span class="identifier">first</span><span class="special">;</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">last</span><span class="special">;</span> <span class="special">++</span><span class="identifier">it</span><span class="special">)</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">"Element = "</span> <span class="special"><<</span> <span class="special">*</span><span class="identifier">it</span> <span class="special"><<</span> <span class="string">" Index = "</span> <span class="special"><<</span> <span class="identifier">it</span><span class="special">.</span><span class="identifier">index</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> |
| <span class="special">}</span> |
| <span class="special">}</span> |
| |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">SinglePassRange</span><span class="special">></span> |
| <span class="keyword">void</span> <span class="identifier">display_element_and_index</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">SinglePassRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">display_element_and_index</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">rng</span><span class="special">),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">rng</span><span class="special">));</span> |
| <span class="special">}</span> |
| |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Iterator1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Iterator2</span><span class="special">></span> |
| <span class="keyword">void</span> <span class="identifier">check_element_and_index</span><span class="special">(</span> |
| <span class="identifier">Iterator1</span> <span class="identifier">test_first</span><span class="special">,</span> |
| <span class="identifier">Iterator1</span> <span class="identifier">test_last</span><span class="special">,</span> |
| <span class="identifier">Iterator2</span> <span class="identifier">reference_first</span><span class="special">,</span> |
| <span class="identifier">Iterator2</span> <span class="identifier">reference_last</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">BOOST_CHECK_EQUAL</span><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">test_first</span><span class="special">,</span> <span class="identifier">test_last</span><span class="special">),</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">reference_first</span><span class="special">,</span> <span class="identifier">reference_last</span><span class="special">)</span> <span class="special">);</span> |
| |
| <span class="keyword">int</span> <span class="identifier">reference_index</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> |
| |
| <span class="identifier">Iterator1</span> <span class="identifier">test_it</span> <span class="special">=</span> <span class="identifier">test_first</span><span class="special">;</span> |
| <span class="identifier">Iterator2</span> <span class="identifier">reference_it</span> <span class="special">=</span> <span class="identifier">reference_first</span><span class="special">;</span> |
| <span class="keyword">for</span> <span class="special">(;</span> <span class="identifier">test_it</span> <span class="special">!=</span> <span class="identifier">test_last</span><span class="special">;</span> <span class="special">++</span><span class="identifier">test_it</span><span class="special">,</span> <span class="special">++</span><span class="identifier">reference_it</span><span class="special">,</span> <span class="special">++</span><span class="identifier">reference_index</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">BOOST_CHECK_EQUAL</span><span class="special">(</span> <span class="special">*</span><span class="identifier">test_it</span><span class="special">,</span> <span class="special">*</span><span class="identifier">reference_it</span> <span class="special">);</span> |
| <span class="identifier">BOOST_CHECK_EQUAL</span><span class="special">(</span> <span class="identifier">test_it</span><span class="special">.</span><span class="identifier">index</span><span class="special">(),</span> <span class="identifier">reference_index</span> <span class="special">);</span> |
| <span class="special">}</span> |
| <span class="special">}</span> |
| |
| <span class="keyword">int</span> <span class="identifier">main</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">argc</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">argv</span><span class="special">[])</span> |
| <span class="special">{</span> |
| <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">assign</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">adaptors</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">input</span><span class="special">;</span> |
| <span class="identifier">input</span> <span class="special">+=</span> <span class="number">10</span><span class="special">,</span><span class="number">20</span><span class="special">,</span><span class="number">30</span><span class="special">,</span><span class="number">40</span><span class="special">,</span><span class="number">50</span><span class="special">,</span><span class="number">60</span><span class="special">,</span><span class="number">70</span><span class="special">,</span><span class="number">80</span><span class="special">,</span><span class="number">90</span><span class="special">;</span> |
| |
| <span class="identifier">display_element_and_index</span><span class="special">(</span> <span class="identifier">input</span> <span class="special">|</span> <span class="identifier">indexed</span><span class="special">(</span><span class="number">0</span><span class="special">)</span> <span class="special">);</span> |
| |
| <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> |
| <span class="special">}</span> |
| </pre> |
| <p> |
| </p> |
| </div> |
| <p> |
| This would produce the output: |
| </p> |
| <pre class="programlisting"><span class="identifier">Element</span> <span class="special">=</span> <span class="number">10</span> <span class="identifier">Index</span> <span class="special">=</span> <span class="number">0</span> |
| <span class="identifier">Element</span> <span class="special">=</span> <span class="number">20</span> <span class="identifier">Index</span> <span class="special">=</span> <span class="number">1</span> |
| <span class="identifier">Element</span> <span class="special">=</span> <span class="number">30</span> <span class="identifier">Index</span> <span class="special">=</span> <span class="number">2</span> |
| <span class="identifier">Element</span> <span class="special">=</span> <span class="number">40</span> <span class="identifier">Index</span> <span class="special">=</span> <span class="number">3</span> |
| <span class="identifier">Element</span> <span class="special">=</span> <span class="number">50</span> <span class="identifier">Index</span> <span class="special">=</span> <span class="number">4</span> |
| <span class="identifier">Element</span> <span class="special">=</span> <span class="number">60</span> <span class="identifier">Index</span> <span class="special">=</span> <span class="number">5</span> |
| <span class="identifier">Element</span> <span class="special">=</span> <span class="number">70</span> <span class="identifier">Index</span> <span class="special">=</span> <span class="number">6</span> |
| <span class="identifier">Element</span> <span class="special">=</span> <span class="number">80</span> <span class="identifier">Index</span> <span class="special">=</span> <span class="number">7</span> |
| <span class="identifier">Element</span> <span class="special">=</span> <span class="number">90</span> <span class="identifier">Index</span> <span class="special">=</span> <span class="number">8</span> |
| </pre> |
| <p> |
| </p> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003 -2010 Thorsten Ottosen, Neil Groves<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
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