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WaitHandler.html

WaitHandler.html 5.9 KB
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  4. <title>Wait handler requirements</title>
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  13. <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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  18. <div class="section">
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  19. <div class="titlepage"><div><div><h3 class="title">
    20. 

  20. <a name="asio.reference.WaitHandler"></a><a class="link" href="WaitHandler.html" title="Wait handler requirements">Wait handler requirements</a>
    21. 

  21. </h3></div></div></div>
    22. 

  22. <p>
    23. 

  23.         A wait handler must meet the requirements for a <a class="link" href="Handler.html" title="Handlers">handler</a>.
    24. 

  24.         A value <code class="computeroutput"><span class="identifier">h</span></code> of a wait handler
    25. 

  25.         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></code>,
    26. 

  26.         where <code class="computeroutput"><span class="identifier">ec</span></code> is an lvalue of
    27. 

  27.         type <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">error_code</span></code>.
    28. 

  28.       </p>
    29. 

  29. <h5>
    30. 

  30. <a name="asio.reference.WaitHandler.h0"></a>
    31. 

  31.         <span><a name="asio.reference.WaitHandler.examples"></a></span><a class="link" href="WaitHandler.html#asio.reference.WaitHandler.examples">Examples</a>
    32. 

  32.       </h5>
    33. 

  33. <p>
    34. 

  34.         A free function as a wait handler:
    35. 

  35.       </p>
    36. 

  36. <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">wait_handler</span><span class="special">(</span>
    37. 

  37.     <span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">)</span>
    38. 

  38. <span class="special">{</span>
    39. 

  39.   <span class="special">...</span>
    40. 

  40. <span class="special">}</span>
    41. 

  41. </pre>
    42. 

  42. <p>
    43. 

  43.         A wait handler function object:
    44. 

  44.       </p>
    45. 

  45. <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">wait_handler</span>
    46. 

  46. <span class="special">{</span>
    47. 

  47.   <span class="special">...</span>
    48. 

  48.   <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span>
    49. 

  49.       <span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">)</span>
    50. 

  50.   <span class="special">{</span>
    51. 

  51.     <span class="special">...</span>
    52. 

  52.   <span class="special">}</span>
    53. 

  53.   <span class="special">...</span>
    54. 

  54. <span class="special">};</span>
    55. 

  55. </pre>
    56. 

  56. <p>
    57. 

  57.         A non-static class member function adapted to a wait handler using <code class="computeroutput"><span class="identifier">bind</span><span class="special">()</span></code>:
    58. 

  58.       </p>
    59. 

  59. <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">my_class</span><span class="special">::</span><span class="identifier">wait_handler</span><span class="special">(</span>
    60. 

  60.     <span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">)</span>
    61. 

  61. <span class="special">{</span>
    62. 

  62.   <span class="special">...</span>
    63. 

  63. <span class="special">}</span>
    64. 

  64. <span class="special">...</span>
    65. 

  65. <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(...,</span>
    66. 

  66.     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">my_class</span><span class="special">::</span><span class="identifier">wait_handler</span><span class="special">,</span>
    67. 

  67.       <span class="keyword">this</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">error</span><span class="special">));</span>
    68. 

  68. </pre>
    69. 

  69. </div>
    70. 

  70. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    71. 

  71. <td align="left"></td>
    72. 

  72. <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2014 Christopher M. Kohlhoff<p>
    73. 

  73.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    74. 

  74.         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>)
    75. 

  75.       </p>
    76. 

  76. </div></td>
    77. 

  77. </tr></table>
    78. 

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