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| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="range.reference.adaptors.reference.map_values"></a><a class="link" href="map_values.html" title="map_values"> map_values</a> |
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| <div class="toc"><dl><dt><span class="section"><a href="map_values.html#range.reference.adaptors.reference.map_values.map_values_example"> |
| map_values example</a></span></dt></dl></div> |
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| Syntax |
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| Code |
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| <p> |
| 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">map_values</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Function |
| </p> |
| </td> |
| <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">values</span><span class="special">(</span><span class="identifier">rng</span><span class="special">)</span></code> |
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| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <span class="bold"><strong>Precondition:</strong></span> The <code class="computeroutput"><span class="identifier">value_type</span></code> of the range is an instantiation |
| of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></code>. |
| </li> |
| <li class="listitem"> |
| <span class="bold"><strong>Postcondition:</strong></span> For all elements |
| <code class="computeroutput"><span class="identifier">x</span></code> in the returned |
| range, <code class="computeroutput"><span class="identifier">x</span></code> is the result |
| of <code class="computeroutput"><span class="identifier">y</span><span class="special">.</span><span class="identifier">second</span></code> where <code class="computeroutput"><span class="identifier">y</span></code> |
| is the corresponding element in the original range. |
| </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.map_values.map_values_example"></a><a class="link" href="map_values.html#range.reference.adaptors.reference.map_values.map_values_example" title="map_values example"> |
| map_values 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">map</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">map</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">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">map</span><span class="special"><</span><span class="keyword">int</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="keyword">for</span> <span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="number">10</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> |
| <span class="identifier">input</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">i</span> <span class="special">*</span> <span class="number">10</span><span class="special">));</span> |
| |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span> |
| <span class="identifier">input</span> <span class="special">|</span> <span class="identifier">map_values</span><span class="special">,</span> |
| <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> |
| |
| <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="number">0</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> |
| </pre> |
| <p> |
| </p> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
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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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