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  22     <TITLE>Generic Image Library: scoped_channel_value</TITLE>
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  39 <h1>scoped_channel_value<br>
  40 <small>
  41 [<a class="el" href="g_i_l_0102.html">Models</a>]</small>
  42 </h1><hr><a name="_details"></a><h2>Detailed Description</h2>
  43 A channel adaptor that modifies the range of the source channel. Models: <a class="el" href="g_i_l_0270.html" title="A channel that supports default construction.">ChannelValueConcept</a>.
  44 <p>
  45 Example: <div class="fragment"><pre class="fragment"><span class="comment">// Create a double channel with range [-0.5 .. 0.5]</span>
  46 <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; } };
  47 <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; } };
  48 <span class="keyword">typedef</span> scoped_channel_value&lt;double, double_minus_half, double_plus_half&gt; bits64custom_t;
  49
  50 <span class="comment">// channel_convert its maximum should map to the maximum</span>
  51 bits64custom_t x = channel_traits&lt;bits64custom_t&gt;::max_value();
  52 assert(x == 0.5);
  53 bits16 y = channel_convert&lt;bits16&gt;(x);
  54 assert(y == 65535);
  55 </pre></div>
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  59 <tr><td colspan="2"><br><h2>Classes</h2></td></tr>
  60 <tr><td class="memItemLeft" nowrap align="right" valign="top">struct &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="g_i_l_0620.html">scoped_channel_value</a></td></tr>
  61
  62 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">A channel adaptor that modifies the range of the source channel. Models: <a class="el" href="g_i_l_0270.html" title="A channel that supports default construction.">ChannelValueConcept</a>.  <a href="g_i_l_0620.html#_details">More...</a><br></td></tr>
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