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| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="algorithm.Misc"></a><a class="link" href="Misc.html" title="Other Algorithms">Other Algorithms</a> |
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| <dt><span class="section"><a href="Misc.html#the_boost_algorithm_library.Misc.clamp">clamp</a></span></dt> |
| <dt><span class="section"><a href="../the_boost_algorithm_library/Misc/gather.html">gather</a></span></dt> |
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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="the_boost_algorithm_library.Misc.clamp"></a><a class="link" href="Misc.html#the_boost_algorithm_library.Misc.clamp" title="clamp">clamp</a> |
| </h3></div></div></div> |
| <p> |
| The header file clamp.hpp contains two functions for "clamping" |
| a value between a pair of boundary values. |
| </p> |
| <h5> |
| <a name="the_boost_algorithm_library.Misc.clamp.h0"></a> |
| <span class="phrase"><a name="the_boost_algorithm_library.Misc.clamp.clamp"></a></span><a class="link" href="Misc.html#the_boost_algorithm_library.Misc.clamp.clamp">clamp</a> |
| </h5> |
| <p> |
| The function <code class="computeroutput"><span class="identifier">clamp</span> <span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">lo</span><span class="special">,</span> <span class="identifier">hi</span><span class="special">)</span></code> |
| returns: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| lo if v < lo |
| </li> |
| <li class="listitem"> |
| hi if hi < v |
| </li> |
| <li class="listitem"> |
| otherwise, v |
| </li> |
| </ul></div> |
| <p> |
| Note: using <code class="computeroutput"><span class="identifier">clamp</span></code> with floating |
| point numbers may give unexpected results if one of the values is <code class="computeroutput"><span class="identifier">NaN</span></code>. |
| </p> |
| <p> |
| There is also a version that allows the caller to specify a comparison predicate |
| to use instead of <code class="computeroutput"><span class="keyword">operator</span> <span class="special"><</span></code>. |
| </p> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">V</span><span class="special">></span> |
| <span class="identifier">V</span> <span class="identifier">clamp</span> <span class="special">(</span> <span class="identifier">V</span> <span class="identifier">val</span><span class="special">,</span> <span class="identifier">V</span> <span class="identifier">lo</span><span class="special">,</span> <span class="identifier">V</span> <span class="identifier">hi</span> <span class="special">);</span> |
| |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">V</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Pred</span><span class="special">></span> |
| <span class="identifier">V</span> <span class="identifier">clamp</span> <span class="special">(</span> <span class="identifier">V</span> <span class="identifier">val</span><span class="special">,</span> <span class="identifier">V</span> <span class="identifier">lo</span><span class="special">,</span> <span class="identifier">V</span> <span class="identifier">hi</span><span class="special">,</span> <span class="identifier">Pred</span> <span class="identifier">p</span> <span class="special">);</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| The following code: |
| </p> |
| <pre class="programlisting"><span class="keyword">int</span> <span class="identifier">foo</span> <span class="special">=</span> <span class="number">23</span><span class="special">;</span> |
| <span class="identifier">foo</span> <span class="special">=</span> <span class="identifier">clamp</span> <span class="special">(</span> <span class="identifier">foo</span><span class="special">,</span> <span class="number">1</span><span class="special">,</span> <span class="number">10</span> <span class="special">);</span> |
| </pre> |
| <p> |
| will leave <code class="computeroutput"><span class="identifier">foo</span></code> with a value |
| of 10 |
| </p> |
| <p> |
| Complexity: <code class="computeroutput"><span class="identifier">clamp</span></code> will make |
| either one or two calls to the comparison predicate before returning one |
| of the three parameters. |
| </p> |
| <h5> |
| <a name="the_boost_algorithm_library.Misc.clamp.h1"></a> |
| <span class="phrase"><a name="the_boost_algorithm_library.Misc.clamp.clamp_range"></a></span><a class="link" href="Misc.html#the_boost_algorithm_library.Misc.clamp.clamp_range">clamp_range</a> |
| </h5> |
| <p> |
| There are also four range-based versions of clamp, that apply clamping to |
| a series of values. You could write them yourself with std::transform and |
| bind, like this: <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">transform</span> <span class="special">(</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">out</span><span class="special">,</span> <span class="identifier">bind</span> |
| <span class="special">(</span> <span class="identifier">clamp</span> |
| <span class="special">(</span> <span class="identifier">_1</span><span class="special">,</span> <span class="identifier">lo</span><span class="special">,</span> |
| <span class="identifier">hi</span> <span class="special">)))</span></code>, |
| but they are provided here for your convenience. |
| </p> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIterator</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">OutputIterator</span><span class="special">></span> |
| <span class="identifier">OutputIterator</span> <span class="identifier">clamp_range</span> <span class="special">(</span> <span class="identifier">InputIterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIterator</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">InputIterator</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">lo</span><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">InputIterator</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">hi</span> <span class="special">);</span> |
| |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Range</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">OutputIterator</span><span class="special">></span> |
| <span class="identifier">OutputIterator</span> <span class="identifier">clamp_range</span> <span class="special">(</span> <span class="keyword">const</span> <span class="identifier">Range</span> <span class="special">&</span><span class="identifier">r</span><span class="special">,</span> <span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">Range</span><span class="special">>::</span><span class="identifier">type</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">lo</span><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">Range</span><span class="special">>::</span><span class="identifier">type</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">hi</span> <span class="special">);</span> |
| |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIterator</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Pred</span><span class="special">></span> |
| <span class="identifier">OutputIterator</span> <span class="identifier">clamp_range</span> <span class="special">(</span> <span class="identifier">InputIterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIterator</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">InputIterator</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">lo</span><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">InputIterator</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">hi</span><span class="special">,</span> <span class="identifier">Pred</span> <span class="identifier">p</span> <span class="special">);</span> |
| |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Range</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Pred</span><span class="special">></span> |
| <span class="identifier">OutputIterator</span> <span class="identifier">clamp_range</span> <span class="special">(</span> <span class="keyword">const</span> <span class="identifier">Range</span> <span class="special">&</span><span class="identifier">r</span><span class="special">,</span> <span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">Range</span><span class="special">>::</span><span class="identifier">type</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">lo</span><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">Range</span><span class="special">>::</span><span class="identifier">type</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">hi</span><span class="special">,</span> |
| <span class="identifier">Pred</span> <span class="identifier">p</span> <span class="special">);</span> |
| </pre> |
| <p> |
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| 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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