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- <li class="navelem"><b>boost</b></li><li class="navelem"><b>gil</b></li><li class="navelem"><b>detail</b></li><li class="navelem"><a class="el" href="structboost_1_1gil_1_1detail_1_1nth__channel__deref__fn.html">nth_channel_deref_fn</a></li> </ul>
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- <div class="title">nth_channel_deref_fn< SrcP > Struct Template Reference<div class="ingroups"><a class="el" href="group___pixel_dereference_adaptor.html">Pixel Dereference Adaptor</a> » <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)
- <a href="structboost_1_1gil_1_1detail_1_1nth__channel__deref__fn.html#details">More...</a></p>
- <p><code>#include <<a class="el" href="image__view__factory_8hpp_source.html">image_view_factory.hpp</a>></code></p>
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- using </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>< const_ref_t ></td></tr>
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- using </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>< channel_t, <a class="el" href="structboost_1_1gil_1_1layout.html">gray_layout_t</a> >::type</td></tr>
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- using </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>< channel_t, <a class="el" href="structboost_1_1gil_1_1layout.html">gray_layout_t</a>, false, false >::type</td></tr>
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- using </td><td class="memItemRight" valign="bottom"><b>argument_type</b> = SrcP</td></tr>
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- using </td><td class="memItemRight" valign="bottom"><b>reference</b> = mp11::mp_if_c< is_mutable, ref_t, value_type ></td></tr>
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- using </td><td class="memItemRight" valign="bottom"><b>result_type</b> = reference</td></tr>
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-  </td><td class="memItemRight" valign="bottom"><b>nth_channel_deref_fn</b> (int n=0)</td></tr>
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- template<typename P > </td></tr>
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- result_type </td><td class="memItemRight" valign="bottom"><b>operator()</b> (argument_type srcP) const</td></tr>
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- int </td><td class="memItemRight" valign="bottom"><b>_n</b></td></tr>
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- Static Public Attributes</h2></td></tr>
- <tr class="memitem:ada04709db53ded2c170444a3f1c4e5d4"><td class="memItemLeft" align="right" valign="top">static constexpr bool </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<typename SrcP><br />
- struct boost::gil::detail::nth_channel_deref_fn< SrcP ></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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- <h2 class="memtitle"><span class="permalink"><a href="#ada04709db53ded2c170444a3f1c4e5d4">◆ </a></span>is_mutable</h2>
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- <td class="memname">constexpr bool is_mutable</td>
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- <b>Initial value:</b><div class="fragment"><div class="line">=</div><div class="line"> pixel_is_reference<SrcP>::value && pixel_reference_is_mutable<SrcP>::value</div></div><!-- fragment -->
- </div>
- </div>
- <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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