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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_asio.reference.ResolverService"></a><a class="link" href="ResolverService.html" title="Resolver service requirements">Resolver service |
| requirements</a> |
| </h3></div></div></div> |
| <p> |
| A resolver service must meet the requirements for an <a class="link" href="IoObjectService.html" title="I/O object service requirements">I/O |
| object service</a>, as well as the additional requirements listed below. |
| </p> |
| <p> |
| In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes |
| a resolver service class for protocol <code class="computeroutput"><span class="identifier">InternetProtocol</span></code>, |
| <code class="computeroutput"><span class="identifier">a</span></code> denotes a value of type |
| <code class="computeroutput"><span class="identifier">X</span></code>, <code class="computeroutput"><span class="identifier">b</span></code> |
| denotes a value of type <code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span></code>, |
| <code class="computeroutput"><span class="identifier">q</span></code> denotes a value of type |
| <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_query</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">></span></code>, |
| <code class="computeroutput"><span class="identifier">e</span></code> denotes a value of type |
| <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_endpoint</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">></span></code>, |
| <code class="computeroutput"><span class="identifier">ec</span></code> denotes a value of type |
| <code class="computeroutput"><span class="identifier">error_code</span></code>, and <code class="computeroutput"><span class="identifier">h</span></code> denotes a value meeting <a class="link" href="ResolveHandler.html" title="Resolve handler requirements"><code class="computeroutput"><span class="identifier">ResolveHandler</span></code></a> requirements. |
| </p> |
| <div class="table"> |
| <a name="id845430"></a><p class="title"><b>Table 22. ResolverService requirements</b></p> |
| <div class="table-contents"><table class="table" summary="ResolverService requirements"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| expression |
| </p> |
| </th> |
| <th> |
| <p> |
| return type |
| </p> |
| </th> |
| <th> |
| <p> |
| assertion/note<br> pre/post-condition |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span></code> |
| </p> |
| </td> |
| <td> |
| </td> |
| <td> |
| <p> |
| From <a class="link" href="IoObjectService.html" title="I/O object service requirements">IoObjectService</a> |
| requirements. Implicitly cancels asynchronous resolve operations, |
| as if by calling <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">cancel</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">)</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">cancel</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span> |
| </pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">error_code</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Causes any outstanding asynchronous resolve operations to complete |
| as soon as possible. Handlers for cancelled operations shall be |
| passed the error code <code class="computeroutput"><span class="identifier">error</span><span class="special">::</span><span class="identifier">operation_aborted</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">q</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span> |
| </pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span> |
| <span class="identifier">InternetProtocol</span><span class="special">></span> |
| </pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| <p> |
| On success, returns an iterator <code class="computeroutput"><span class="identifier">i</span></code> |
| such that <code class="computeroutput"><span class="identifier">i</span> <span class="special">!=</span> |
| <span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">>()</span></code>. |
| Otherwise returns <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">>()</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">async_resolve</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">q</span><span class="special">,</span> <span class="identifier">h</span><span class="special">);</span> |
| </pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| </td> |
| <td> |
| <p> |
| Initiates an asynchronous resolve operation that is performed via |
| the <code class="computeroutput"><span class="identifier">io_service</span></code> |
| object <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">io_service</span><span class="special">()</span></code> |
| and behaves according to <a class="link" href="asynchronous_operations.html" title="Requirements on asynchronous operations">asynchronous |
| operation</a> requirements.<br> <br> If the operation completes |
| successfully, the <code class="computeroutput"><span class="identifier">ResolveHandler</span></code> |
| object <code class="computeroutput"><span class="identifier">h</span></code> shall |
| be invoked with an iterator object <code class="computeroutput"><span class="identifier">i</span></code> |
| such that the condition <code class="computeroutput"><span class="identifier">i</span> |
| <span class="special">!=</span> <span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">>()</span></code> holds. Otherwise it is invoked |
| with <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">>()</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span> |
| </pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span> |
| <span class="identifier">InternetProtocol</span><span class="special">></span> |
| </pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| <p> |
| On success, returns an iterator <code class="computeroutput"><span class="identifier">i</span></code> |
| such that <code class="computeroutput"><span class="identifier">i</span> <span class="special">!=</span> |
| <span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">>()</span></code>. |
| Otherwise returns <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">>()</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">async_resolve</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">h</span><span class="special">);</span> |
| </pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| </td> |
| <td> |
| <p> |
| Initiates an asynchronous resolve operation that is performed via |
| the <code class="computeroutput"><span class="identifier">io_service</span></code> |
| object <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">io_service</span><span class="special">()</span></code> |
| and behaves according to <a class="link" href="asynchronous_operations.html" title="Requirements on asynchronous operations">asynchronous |
| operation</a> requirements.<br> <br> If the operation completes |
| successfully, the <code class="computeroutput"><span class="identifier">ResolveHandler</span></code> |
| object <code class="computeroutput"><span class="identifier">h</span></code> shall |
| be invoked with an iterator object <code class="computeroutput"><span class="identifier">i</span></code> |
| such that the condition <code class="computeroutput"><span class="identifier">i</span> |
| <span class="special">!=</span> <span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">>()</span></code> holds. Otherwise it is invoked |
| with <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver_iterator</span><span class="special"><</span><span class="identifier">InternetProtocol</span><span class="special">>()</span></code>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <br class="table-break"> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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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