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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="range.reference.utilities.combine"></a><a class="link" href="combine.html" title="Function combine">Function combine</a> |
| </h4></div></div></div> |
| <p> |
| The <code class="computeroutput"><span class="identifier">combine</span></code> function is |
| used to make one range from multiple ranges. The <code class="computeroutput"><span class="identifier">combine</span></code> |
| function returns a <code class="computeroutput"><span class="identifier">combined_range</span></code> |
| which is an <code class="computeroutput"><span class="identifier">iterator_range</span></code> |
| of a <code class="computeroutput"><span class="identifier">zip_iterator</span></code> from |
| the Boost.Iterator library. |
| </p> |
| <h5> |
| <a name="range.reference.utilities.combine.h0"></a> |
| <span class="phrase"><a name="range.reference.utilities.combine.synopsis"></a></span><a class="link" href="combine.html#range.reference.utilities.combine.synopsis">Synopsis</a> |
| </h5> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> |
| <span class="special">{</span> |
| <span class="keyword">namespace</span> <span class="identifier">range</span> |
| <span class="special">{</span> |
| |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">IterTuple</span><span class="special">></span> |
| <span class="keyword">class</span> <span class="identifier">combined_range</span> |
| <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">iterator_range</span><span class="special"><</span><span class="identifier">zip_iterator</span><span class="special"><</span><span class="identifier">IterTuple</span><span class="special">></span> <span class="special">></span> |
| <span class="special">{</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="identifier">combined_range</span><span class="special">(</span><span class="identifier">IterTuple</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">IterTuple</span> <span class="identifier">last</span><span class="special">);</span> |
| <span class="special">};</span> |
| |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> <span class="identifier">Ranges</span><span class="special">></span> |
| <span class="keyword">auto</span> <span class="identifier">combine</span><span class="special">(</span><span class="identifier">Ranges</span><span class="special">&&...</span> <span class="identifier">rngs</span><span class="special">)</span> <span class="special">-></span> |
| <span class="identifier">combined_range</span><span class="special"><</span><span class="keyword">decltype</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">make_tuple</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">rngs</span><span class="special">)...))></span> |
| |
| <span class="special">}</span> <span class="comment">// namespace range</span> |
| <span class="special">}</span> <span class="comment">// namespace boost</span> |
| </pre> |
| <p> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| <span class="bold"><strong>Precondition:</strong></span> For each type <code class="computeroutput"><span class="identifier">r</span></code> in <code class="computeroutput"><span class="identifier">Ranges</span></code>, |
| <code class="computeroutput"><span class="identifier">r</span></code> is a model of <a class="link" href="../../concepts/single_pass_range.html" title="Single Pass Range">Single Pass Range</a> |
| or better. |
| </li> |
| <li class="listitem"> |
| <span class="bold"><strong>Return Type:</strong></span> <code class="computeroutput"><span class="identifier">combined_range</span><span class="special"><</span><span class="identifier">tuple</span><span class="special"><</span><span class="keyword">typename</span> |
| <span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">Ranges</span><span class="special">>::</span><span class="identifier">type</span><span class="special">...></span> |
| <span class="special">></span></code> |
| </li> |
| <li class="listitem"> |
| <span class="bold"><strong>Returned Range Category:</strong></span> The minimum |
| of the range category of every range <code class="computeroutput"><span class="identifier">r</span></code> |
| in <code class="computeroutput"><span class="identifier">Ranges</span></code>. |
| </li> |
| </ul></div> |
| <h5> |
| <a name="range.reference.utilities.combine.h1"></a> |
| <span class="phrase"><a name="range.reference.utilities.combine.example"></a></span><a class="link" href="combine.html#range.reference.utilities.combine.example">Example</a> |
| </h5> |
| <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">combine</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">foreach</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">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="preprocessor">#include</span> <span class="special"><</span><span class="identifier">list</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="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*[])</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">v</span><span class="special">;</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">list</span><span class="special"><</span><span class="keyword">char</span><span class="special">></span> <span class="identifier">l</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">5</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">v</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span> |
| <span class="identifier">l</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="keyword">static_cast</span><span class="special"><</span><span class="keyword">char</span><span class="special">>(</span><span class="identifier">i</span><span class="special">)</span> <span class="special">+</span> <span class="char">'a'</span><span class="special">);</span> |
| <span class="special">}</span> |
| |
| <span class="keyword">int</span> <span class="identifier">ti</span><span class="special">;</span> |
| <span class="keyword">char</span> <span class="identifier">tc</span><span class="special">;</span> |
| <span class="identifier">BOOST_FOREACH</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">tie</span><span class="special">(</span><span class="identifier">ti</span><span class="special">,</span> <span class="identifier">tc</span><span class="special">),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">combine</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">l</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="char">'('</span> <span class="special"><<</span> <span class="identifier">ti</span> <span class="special"><<</span> <span class="char">','</span> <span class="special"><<</span> <span class="identifier">tv</span> <span class="special"><<</span> <span class="char">')'</span> <span class="special"><<</span> <span class="char">'\n'</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> |
| <p> |
| This produces the output: |
| </p> |
| <pre class="programlisting"><span class="special">(</span><span class="number">0</span><span class="special">,</span><span class="identifier">a</span><span class="special">)</span> |
| <span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="identifier">b</span><span class="special">)</span> |
| <span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="identifier">c</span><span class="special">)</span> |
| <span class="special">(</span><span class="number">3</span><span class="special">,</span><span class="identifier">d</span><span class="special">)</span> |
| <span class="special">(</span><span class="number">4</span><span class="special">,</span><span class="identifier">e</span><span class="special">)</span> |
| </pre> |
| <p> |
| </p> |
| </div> |
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| <td align="left"></td> |
| <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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