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<div class="title">nth_channel_deref_fn&lt; SrcP &gt; Struct Template Reference<div class="ingroups"><a class="el" href="group___pixel_dereference_adaptor.html">Pixel Dereference Adaptor</a> &raquo; <a class="el" href="group___pixel_dereference_adaptor_model.html">Models</a></div></div>  </div>
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<p>Function object that returns a grayscale reference of the N-th channel of a given reference. Models: <a class="el" href="structboost_1_1gil_1_1_pixel_dereference_adaptor_concept.html" title="Represents a unary function object that can be invoked upon dereferencing a pixel iterator.">PixelDereferenceAdaptorConcept</a>.If the input is a pixel value or constant reference, the function object is immutable. Otherwise it is mutable (and returns non-const reference to the n-th channel)  
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<p><code>#include &lt;<a class="el" href="image__view__factory_8hpp_source.html">image_view_factory.hpp</a>&gt;</code></p>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>const_t</b> = <a class="el" href="structboost_1_1gil_1_1detail_1_1nth__channel__deref__fn.html">nth_channel_deref_fn</a>&lt; const_ref_t &gt;</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>value_type</b> = typename <a class="el" href="structboost_1_1gil_1_1pixel__value__type.html">pixel_value_type</a>&lt; channel_t, <a class="el" href="structboost_1_1gil_1_1layout.html">gray_layout_t</a> &gt;::type</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>const_reference</b> = typename <a class="el" href="structboost_1_1gil_1_1pixel__reference__type.html">pixel_reference_type</a>&lt; channel_t, <a class="el" href="structboost_1_1gil_1_1layout.html">gray_layout_t</a>, false, false &gt;::type</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>argument_type</b> = SrcP</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>reference</b> = mp11::mp_if_c&lt; is_mutable, ref_t, value_type &gt;</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>result_type</b> = reference</td></tr>
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&#160;</td><td class="memItemRight" valign="bottom"><b>nth_channel_deref_fn</b> (int n=0)</td></tr>
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template&lt;typename P &gt; </td></tr>
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result_type&#160;</td><td class="memItemRight" valign="bottom"><b>operator()</b> (argument_type srcP) const</td></tr>
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int&#160;</td><td class="memItemRight" valign="bottom"><b>_n</b></td></tr>
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<tr class="memitem:ada04709db53ded2c170444a3f1c4e5d4"><td class="memItemLeft" align="right" valign="top">static constexpr bool&#160;</td><td class="memItemRight" valign="bottom"><b>is_mutable</b></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename SrcP&gt;<br />
struct boost::gil::detail::nth_channel_deref_fn&lt; SrcP &gt;</h3>

<p>Function object that returns a grayscale reference of the N-th channel of a given reference. Models: <a class="el" href="structboost_1_1gil_1_1_pixel_dereference_adaptor_concept.html" title="Represents a unary function object that can be invoked upon dereferencing a pixel iterator.">PixelDereferenceAdaptorConcept</a>.</p>
<p>If the input is a pixel value or constant reference, the function object is immutable. Otherwise it is mutable (and returns non-const reference to the n-th channel) </p>
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<a id="ada04709db53ded2c170444a3f1c4e5d4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ada04709db53ded2c170444a3f1c4e5d4">&#9670;&nbsp;</a></span>is_mutable</h2>

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          <td class="memname">constexpr bool is_mutable</td>
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<span class="mlabels"><span class="mlabel">static</span></span>  </td>
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<b>Initial value:</b><div class="fragment"><div class="line">=</div><div class="line">            pixel_is_reference&lt;SrcP&gt;::value &amp;&amp; pixel_reference_is_mutable&lt;SrcP&gt;::value</div></div><!-- fragment -->
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<hr/>The documentation for this struct was generated from the following file:<ul>
<li><a class="el" href="image__view__factory_8hpp_source.html">image_view_factory.hpp</a></li>
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