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<h3><a href="../index.html"><img alt="Boost GIL" src="../_static/gil.png" border="0"></a></h3>
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<a href="#groups">Modules</a> </div>
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<div class="headertitle"><div class="title">scoped_channel_value<div class="ingroups"><a class="el" href="group___channel.html">Channel</a> » <a class="el" href="group___channel_model.html">Models</a></div></div></div>
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Modules</h2></td></tr>
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<tr class="memitem:group___packed_channel_value_model" id="r_group___packed_channel_value_model"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___packed_channel_value_model.html">packed_channel_value</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<p>Traits for channels. Contains the following members: </p><div class="fragment"><div class="line"><span class="keyword">template</span> <<span class="keyword">typename</span> Channel></div>
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<div class="line"><span class="keyword">struct </span>channel_traits {</div>
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<div class="line"> <span class="keyword">using </span>value_type = ...;</div>
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<div class="line"> <span class="keyword">using </span>reference = ...;</div>
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<div class="line"> <span class="keyword">using </span>pointer = ...;</div>
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<div class="line"> <span class="keyword">using </span>const_reference = ...;</div>
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<div class="line"> <span class="keyword">using </span>const_pointer = ...;</div>
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<div class="line"> </div>
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<div class="line"> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> is_mutable;</div>
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<div class="line"> <span class="keyword">static</span> value_type min_value();</div>
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<div class="line"> <span class="keyword">static</span> value_type max_value();</div>
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<div class="line">};</div>
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</div><!-- fragment --><p>A channel adaptor that modifies the range of the source channel. Models: ChannelValueConcept</p>
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<p>Example: </p><div class="fragment"><div class="line"><span class="comment">// Create a double channel with range [-0.5 .. 0.5]</span></div>
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<div class="line"><span class="keyword">struct </span>double_minus_half { <span class="keyword">static</span> <span class="keywordtype">double</span> apply() { <span class="keywordflow">return</span> -0.5; } };</div>
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<div class="line"><span class="keyword">struct </span>double_plus_half { <span class="keyword">static</span> <span class="keywordtype">double</span> apply() { <span class="keywordflow">return</span> 0.5; } };</div>
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<div class="line"><span class="keyword">using </span>bits64custom_t = scoped_channel_value<double, double_minus_half, double_plus_half>;</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// channel_convert its maximum should map to the maximum</span></div>
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<div class="line">bits64custom_t x = channel_traits<bits64custom_t>::max_value();</div>
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<div class="line">assert(x == 0.5);</div>
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<div class="line">uint16_t y = channel_convert<uint16_t>(x);</div>
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<div class="line">assert(y == 65535);</div>
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