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<h1>
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<div class="m-dox-template">template<typename Mapper = detail::asio::map_default></div>
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<span class="m-breadcrumb"><a href="namespacecti.html">cti</a>::<wbr/></span>use_continuable_t <span class="m-thin">struct</span>
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</h1>
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<p>Type used as an ASIO completion token to specify an asynchronous operation that should return a <a href="classcti_1_1continuable__base.html" class="m-dox">continuable_<wbr />base</a>.</p>
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<table class="m-table m-fullwidth m-flat">
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<thead>
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<tr><th colspan="2">Template parameters</th></tr>
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</thead>
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<tr>
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<td style="width: 1%">Mapper</td>
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<td><p>The token can be instantiated with a custom mapper for asio error codes which makes it possible to ignore errors or treat them as cancellation types. The mapper has the following form:</p><pre class="m-code"><span class="k">struct</span> <span class="n">my_mapper</span> <span class="p">{</span>
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<span class="k">constexpr</span> <span class="n">my_mapper</span><span class="p">()</span> <span class="k">noexcept</span> <span class="p">{}</span>
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<span class="c1">/// Returns true when the error_code_t is a type which represents</span>
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<span class="c1">/// cancellation and</span>
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<span class="kt">bool</span> <span class="n">is_cancellation</span><span class="p">(</span><span class="n">error_code_t</span> <span class="k">const</span><span class="o">&</span> <span class="cm">/*ec*/</span><span class="p">)</span> <span class="k">const</span> <span class="k">noexcept</span> <span class="p">{</span>
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<span class="k">return</span> <span class="nb">false</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="kt">bool</span> <span class="n">is_ignored</span><span class="p">(</span><span class="n">error_code_t</span> <span class="k">const</span><span class="o">&</span> <span class="cm">/*ec*/</span><span class="p">)</span> <span class="k">const</span> <span class="k">noexcept</span> <span class="p">{</span>
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<span class="k">return</span> <span class="nb">false</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="p">};</span></pre></td>
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<ul><li>Boost 1.70 or asio 1.13.0 is required for the async initiation</li><li>Until boost 1.72 or asio 1.16.0 overhead through an additional type erasure is added. It is recommended to update to those versions.</li></ul><p>The special static variable use_continuable can be appended to any (boost) asio function that accepts a callback to make it return a <a href="classcti_1_1continuable__base.html" class="m-dox">continuable_<wbr />base</a>.</p><pre class="m-code"><span class="cp">#include</span> <span class="cpf"><continuable/continuable.hpp></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><continuable/external/asio.hpp></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><asio.hpp></span><span class="cp"></span>
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<span class="c1">// ...</span>
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<span class="n">asio</span><span class="o">::</span><span class="n">tcp</span><span class="o">::</span><span class="n">resolver</span> <span class="n">resolver</span><span class="p">(...);</span>
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<span class="n">resolver</span><span class="p">.</span><span class="n">async_resolve</span><span class="p">(</span><span class="s">"127.0.0.1"</span><span class="p">,</span> <span class="s">"daytime"</span><span class="p">,</span> <span class="n">cti</span><span class="o">::</span><span class="n">use_continuable</span><span class="p">)</span>
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<span class="p">.</span><span class="n">then</span><span class="p">([](</span><span class="n">asio</span><span class="o">::</span><span class="n">udp</span><span class="o">::</span><span class="n">resolver</span><span class="o">::</span><span class="n">iterator</span> <span class="n">iterator</span><span class="p">)</span> <span class="p">{</span>
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<span class="c1">// ...</span>
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<span class="p">});</span></pre><aside class="m-note m-warning"><h4>Attention</h4><p><code>asio::error::basic_errors::operation_aborted</code> errors returned by asio are automatically transformed into a default constructed exception type which represents "operation canceled" by the user or program. If you intend to retrieve the full asio::error_code without remapping use the use_continuable_raw_t completion token instead!</p></aside><aside class="m-note m-default"><h4>Since</h4><p>4.0.0</p></aside>
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