47 lines
3.7 KiB
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47 lines
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<title>Resolve handler requirements</title>
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.ResolveHandler"></a><a class="link" href="ResolveHandler.html" title="Resolve handler requirements">Resolve handler requirements</a>
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</h3></div></div></div>
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<p>
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A resolve handler must meet the requirements for a <a class="link" href="Handler.html" title="Handlers">handler</a>.
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A value <code class="computeroutput"><span class="identifier">h</span></code> of a resolve handler
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class should work correctly in the expression <code class="computeroutput"><span class="identifier">h</span><span class="special">(</span><span class="identifier">ec</span><span class="special">,</span>
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<span class="identifier">r</span><span class="special">)</span></code>,
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where <code class="computeroutput"><span class="identifier">ec</span></code> is an lvalue of
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type <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">error_code</span></code>
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and <code class="computeroutput"><span class="identifier">r</span></code> is an lvalue of type
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<code class="computeroutput"><span class="keyword">const</span> <span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_results</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">></span></code>. <code class="computeroutput"><span class="identifier">InternetProtocol</span></code>
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is the template parameter of the <a class="link" href="ip__basic_resolver.html" title="ip::basic_resolver"><code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver</span><span class="special"><></span></code></a> which is used to initiate
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the asynchronous operation.
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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