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- <h1><a class="toc-backref" href="./changes-in-boost-1-32-0.html#id66" name="tag-dispatching-protocol">Tag Dispatching Protocol</a></h1>
- <p>The mechanism used to select algorithm implementations based on
- sequence family has been changed to use metafunction classes:</p>
- <table border="1" class="table">
- <colgroup>
- <col width="53%" />
- <col width="47%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th>Before</th>
- <th>Now</th>
- </tr>
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- <tr><td><em>name</em><tt class="literal"><span class="pre">_traits<Tag>::algorithm<...>::type</span></tt></td>
- <td><em>name</em><tt class="literal"><span class="pre">_impl<Tag>::apply<...>::type</span></tt></td>
- </tr>
- </tbody>
- </table>
- <p>If your code implemented a custom sequence, it needs to be adjusted
- according to the above table; for example:</p>
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- <col width="50%" />
- <col width="50%" />
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- template<> struct begin_traits<my_tag>
- {
- template< typename S > struct algorithm
- {
- typedef ... type;
- };
- };
- </pre>
- </td>
- <td><pre class="first last literal-block">
- template<> struct begin_<strong>impl</strong><my_tag>
- {
- template< typename S > struct <strong>apply</strong>
- {
- typedef ... type;
- };
- };
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