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| 26 | <div class="titlepage"><div><div><h3 class="title"> | |
| 27 | <a name="boost_typetraits.examples.improved_min"></a><a class="link" href="improved_min.html" title="Improving std::min with common_type">Improving std::min | |
| 28 | with common_type</a> | |
| 29 | </h3></div></div></div> | |
| 30 | <p> | |
| 31 | An improved <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">min</span></code> function could be written like this: | |
| 32 | </p> | |
| 33 | <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">></span> | |
| 34 | <span class="keyword">typename</span> <a class="link" href="../reference/common_type.html" title="common_type">common_type</a><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">min</span><span class="special">(</span><span class="identifier">T</span> <span class="identifier">t</span><span class="special">,</span> <span class="identifier">U</span> <span class="identifier">u</span><span class="special">)</span> | |
| 35 | <span class="special">{</span> | |
| 36 | <span class="keyword">return</span> <span class="identifier">t</span> <span class="special"><</span> <span class="identifier">u</span> <span class="special">?</span> <span class="identifier">t</span> <span class="special">:</span> <span class="identifier">u</span><span class="special">;</span> | |
| 37 | <span class="special">}</span> | |
| 38 | </pre> | |
| 39 | <p> | |
| 40 | And now expressions such as: | |
| 41 | </p> | |
| 42 | <pre class="programlisting"><span class="identifier">min</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">2.0</span><span class="special">)</span> | |
| 43 | </pre> | |
| 44 | <p> | |
| 45 | will actually compile and return the correct type! | |
| 46 | </p> | |
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| 50 | <td align="right"><div class="copyright-footer">Copyright © 2000, 2011 Adobe Systems Inc, David Abrahams, | |
| 51 | Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant, | |
| 52 | Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten | |
| 53 | Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven | |
| 54 | Watanabe<p> | |
| 55 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 56 | 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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