abby
/
librf
mirror of https://github.com/tearshark/librf.git
Watch 1
Star 0
Fork 0
Code Issues 0 Releases 2 Wiki Activity
基于C++ Coroutines提案 ‘Stackless Resumable Functions’编写的协程库
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
182 Commits
2 Branches
Tree: b3386e919e
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'b3386e919e'
${ noResults }
librf/doxygen/html/ring__queue_8h_source.html

ring__queue_8h_source.html 24KB
Raw Blame History

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229 
  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

  2. <html xmlns="http://www.w3.org/1999/xhtml">

  3. <head>

  4. <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>

  5. <meta http-equiv="X-UA-Compatible" content="IE=9"/>

  6. <meta name="generator" content="Doxygen 1.8.17"/>

  7. <meta name="viewport" content="width=device-width, initial-scale=1"/>

  8. <title>librf: librf/src/ring_queue.h 源文件</title>

  9. <link href="tabs.css" rel="stylesheet" type="text/css"/>

  10. <script type="text/javascript" src="jquery.js"></script>

  11. <script type="text/javascript" src="dynsections.js"></script>

  12. <link href="search/search.css" rel="stylesheet" type="text/css"/>

  13. <script type="text/javascript" src="search/searchdata.js"></script>

  14. <script type="text/javascript" src="search/search.js"></script>

  15. <link href="doxygen.css" rel="stylesheet" type="text/css" />

  16. </head>

  17. <body>

  18. <div id="top"><!-- do not remove this div, it is closed by doxygen! -->

  19. <div id="titlearea">

  20. <table cellspacing="0" cellpadding="0">

  21.  <tbody>

  22.  <tr style="height: 56px;">

  23.   <td id="projectalign" style="padding-left: 0.5em;">

  24.    <div id="projectname">librf

  25.    </div>

  26.   </td>

  27.  </tr>

  28.  </tbody>

  29. </table>

  30. </div>

  31. <!-- end header part -->

  32. <!-- 制作者 Doxygen 1.8.17 -->

  33. <script type="text/javascript">

  34. /* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&amp;dn=gpl-2.0.txt GPL-v2 */

  35. var searchBox = new SearchBox("searchBox", "search",false,'搜索');

  36. /* @license-end */

  37. </script>

  38. <script type="text/javascript" src="menudata.js"></script>

  39. <script type="text/javascript" src="menu.js"></script>

  40. <script type="text/javascript">

  41. /* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&amp;dn=gpl-2.0.txt GPL-v2 */

  42. $(function() {

  43.   initMenu('',true,false,'search.php','搜索');

  44.   $(document).ready(function() { init_search(); });

  45. });

  46. /* @license-end */</script>

  47. <div id="main-nav"></div>

  48. <!-- window showing the filter options -->

  49. <div id="MSearchSelectWindow"

  50.      onmouseover="return searchBox.OnSearchSelectShow()"

  51.      onmouseout="return searchBox.OnSearchSelectHide()"

  52.      onkeydown="return searchBox.OnSearchSelectKey(event)">

  53. </div>

  54. 

  55. <!-- iframe showing the search results (closed by default) -->

  56. <div id="MSearchResultsWindow">

  57. <iframe src="javascript:void(0)" frameborder="0" 

  58.         name="MSearchResults" id="MSearchResults">

  59. </iframe>

  60. </div>

  61. 

  62. <div id="nav-path" class="navpath">

  63.   <ul>

  64. <li class="navelem"><a class="el" href="dir_3c80010775d22af2067790ecc9cdcf9d.html">librf</a></li><li class="navelem"><a class="el" href="dir_54ae0e78d997f6903cdf0996223d047f.html">src</a></li>  </ul>

  65. </div>

  66. </div><!-- top -->

  67. <div class="header">

  68.   <div class="headertitle">

  69. <div class="title">ring_queue.h</div>  </div>

  70. </div><!--header-->

  71. <div class="contents">

  72. <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#pragma once</span></div>

  73. <div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160; </div>

  74. <div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="keyword">namespace </span>resumef</div>

  75. <div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;{</div>

  76. <div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;    <span class="comment">//使用自旋锁完成的线程安全的环形队列。</span></div>

  77. <div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;    <span class="comment">//支持多个线程同时push和pop。</span></div>

  78. <div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;    <span class="comment">//_Option : 如果队列保存的数据不支持拷贝只支持移动，则需要设置为true；或者数据希望pop后销毁，都需要设置为true。</span></div>

  79. <div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;    <span class="comment">//_Sty : 内存保持数量和索引的整数类型。用于外部控制队列的结构体大小。</span></div>

  80. <div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option = false, <span class="keyword">class</span> _Sty = u<span class="keywordtype">int</span>32_t&gt;</div>

  81. <div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;    <span class="keyword">struct </span>ring_queue</div>

  82. <div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;    {</div>

  83. <div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;        <span class="keyword">using</span> value_type = _Ty;</div>

  84. <div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;        <span class="keyword">using</span> size_type = _Sty;</div>

  85. <div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>

  86. <div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;        <span class="keyword">static</span> constexpr <span class="keywordtype">bool</span> use_option = _Option;</div>

  87. <div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;        <span class="keyword">using</span> optional_type = std::conditional_t&lt;use_option, std::optional&lt;value_type&gt;, value_type&gt;;</div>

  88. <div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;    <span class="keyword">public</span>:</div>

  89. <div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;        ring_queue(<span class="keywordtype">size_t</span> sz);</div>

  90. <div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160; </div>

  91. <div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;        ring_queue(<span class="keyword">const</span> ring_queue&amp;) = <span class="keyword">delete</span>;</div>

  92. <div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;        ring_queue(ring_queue&amp;&amp;) = <span class="keywordflow">default</span>;</div>

  93. <div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;        ring_queue&amp; operator =(<span class="keyword">const</span> ring_queue&amp;) = <span class="keyword">delete</span>;</div>

  94. <div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;        ring_queue&amp; operator =(ring_queue&amp;&amp;) = <span class="keywordflow">default</span>;</div>

  95. <div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160; </div>

  96. <div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;        <span class="keyword">auto</span> size() const noexcept-&gt;size_type;</div>

  97. <div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;        auto capacity() const noexcept-&gt;size_type;</div>

  98. <div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;        <span class="keywordtype">bool</span> empty() const noexcept;</div>

  99. <div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;        <span class="keywordtype">bool</span> full() const noexcept;</div>

  100. <div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;        template&lt;class U&gt;</div>

  101. <div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;        <span class="keywordtype">bool</span> try_push(U&amp;&amp; value) noexcept(std::is_nothrow_move_assignable_v&lt;U&gt;);</div>

  102. <div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;        template&lt;class U&gt;</div>

  103. <div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;        <span class="keywordtype">bool</span> try_pop(U&amp; value) noexcept(std::is_nothrow_move_assignable_v&lt;value_type&gt;);</div>

  104. <div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    private:</div>

  105. <div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;        using container_type = std::unique_ptr&lt;optional_type[]&gt;;</div>

  106. <div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;        container_type m_bufferPtr;</div>

  107. <div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;        size_type m_bufferSize;</div>

  108. <div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160; </div>

  109. <div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        size_type m_writeIndex;</div>

  110. <div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        size_type m_readIndex;</div>

  111. <div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    <span class="preprocessor">#ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>

  112. <div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;        std::atomic&lt;size_type&gt; m_count;</div>

  113. <div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="preprocessor">    #endif</span></div>

  114. <div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160; </div>

  115. <div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        <span class="keyword">auto</span> nextIndex(size_type a_count) <span class="keyword">const</span> noexcept-&gt;size_type;</div>

  116. <div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    };</div>

  117. <div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160; </div>

  118. <div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty&gt;</div>

  119. <div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    ring_queue&lt;_Ty, _Option, _Sty&gt;::ring_queue(<span class="keywordtype">size_t</span> sz)</div>

  120. <div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        : m_bufferPtr(new optional_type[sz + 1])</div>

  121. <div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;        , m_bufferSize(static_cast&lt;size_type&gt;(sz + 1))</div>

  122. <div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;        , m_writeIndex(0)</div>

  123. <div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        , m_readIndex(0)</div>

  124. <div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;    #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</div>

  125. <div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;        , m_count(0)</div>

  126. <div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    #endif</div>

  127. <div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    {</div>

  128. <div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        assert(sz &lt; (std::numeric_limits&lt;size_type&gt;::max)());</div>

  129. <div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    }</div>

  130. <div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160; </div>

  131. <div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty&gt;</div>

  132. <div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    <span class="keyword">auto</span> ring_queue&lt;_Ty, _Option, _Sty&gt;::nextIndex(size_type a_count) <span class="keyword">const</span> noexcept-&gt;size_type</div>

  133. <div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    {</div>

  134. <div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>size_type<span class="keyword">&gt;</span>((a_count + 1) % m_bufferSize);</div>

  135. <div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    }</div>

  136. <div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160; </div>

  137. <div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty&gt;</div>

  138. <div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    <span class="keyword">auto</span> ring_queue&lt;_Ty, _Option, _Sty&gt;::size() const noexcept-&gt;size_type</div>

  139. <div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    {</div>

  140. <div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="preprocessor">    #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>

  141. <div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;        <span class="keywordflow">return</span> m_count.load(std::memory_order_acquire);</div>

  142. <div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="preprocessor">    #else</span></div>

  143. <div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;        <span class="keywordflow">if</span> (m_writeIndex &gt;= m_readIndex)</div>

  144. <div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;            <span class="keywordflow">return</span> (m_writeIndex - m_readIndex);</div>

  145. <div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;        <span class="keywordflow">else</span></div>

  146. <div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;            <span class="keywordflow">return</span> (m_bufferSize + m_writeIndex - m_readIndex);</div>

  147. <div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="preprocessor">    #endif // _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>

  148. <div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    }</div>

  149. <div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160; </div>

  150. <div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty&gt;</div>

  151. <div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    <span class="keyword">auto</span> ring_queue&lt;_Ty, _Option, _Sty&gt;::capacity() const noexcept-&gt;size_type</div>

  152. <div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    {</div>

  153. <div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        <span class="keywordflow">return</span> m_bufferSize - 1;</div>

  154. <div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    }</div>

  155. <div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160; </div>

  156. <div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty&gt;</div>

  157. <div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    <span class="keywordtype">bool</span> ring_queue&lt;_Ty, _Option, _Sty&gt;::empty() const noexcept</div>

  158. <div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    {</div>

  159. <div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="preprocessor">    #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>

  160. <div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        <span class="keywordflow">return</span> m_count.load(std::memory_order_acquire) == 0;</div>

  161. <div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="preprocessor">    #else</span></div>

  162. <div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;        <span class="keywordflow">return</span> m_writeIndex == m_readIndex;</div>

  163. <div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="preprocessor">    #endif // _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>

  164. <div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    }</div>

  165. <div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160; </div>

  166. <div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty&gt;</div>

  167. <div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    <span class="keywordtype">bool</span> ring_queue&lt;_Ty, _Option, _Sty&gt;::full() const noexcept</div>

  168. <div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    {</div>

  169. <div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="preprocessor">    #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>

  170. <div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;        <span class="keywordflow">return</span> (m_count.load(std::memory_order_acquire) == (m_bufferSize - 1));</div>

  171. <div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="preprocessor">    #else</span></div>

  172. <div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;        <span class="keywordflow">return</span> nextIndex(m_writeIndex) == m_readIndex;</div>

  173. <div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="preprocessor">    #endif // _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>

  174. <div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    }</div>

  175. <div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160; </div>

  176. <div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty&gt;</div>

  177. <div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> U&gt;</div>

  178. <div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    <span class="keywordtype">bool</span> ring_queue&lt;_Ty, _Option, _Sty&gt;::try_push(U&amp;&amp; value) noexcept(std::is_nothrow_move_assignable_v&lt;U&gt;)</div>

  179. <div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    {</div>

  180. <div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;        <span class="keyword">auto</span> nextWriteIndex = nextIndex(m_writeIndex);</div>

  181. <div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;        <span class="keywordflow">if</span> (nextWriteIndex == m_readIndex)</div>

  182. <div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;            <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>

  183. <div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160; </div>

  184. <div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;        assert(m_writeIndex &lt; m_bufferSize);</div>

  185. <div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160; </div>

  186. <div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;        m_bufferPtr[m_writeIndex] = std::move(value);</div>

  187. <div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;        m_writeIndex = nextWriteIndex;</div>

  188. <div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160; </div>

  189. <div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;<span class="preprocessor">    #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>

  190. <div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;        m_count.fetch_add(1, std::memory_order_acq_rel);</div>

  191. <div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="preprocessor">    #endif</span></div>

  192. <div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;        <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>

  193. <div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    }</div>

  194. <div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160; </div>

  195. <div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty&gt;</div>

  196. <div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> U&gt;</div>

  197. <div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    <span class="keywordtype">bool</span> ring_queue&lt;_Ty, _Option, _Sty&gt;::try_pop(U&amp; value) noexcept(std::is_nothrow_move_assignable_v&lt;value_type&gt;)</div>

  198. <div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    {</div>

  199. <div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;        <span class="keywordflow">if</span> (m_readIndex == m_writeIndex)</div>

  200. <div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;            <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>

  201. <div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160; </div>

  202. <div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;        optional_type&amp; ov = m_bufferPtr[m_readIndex];</div>

  203. <div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        <span class="keywordflow">if</span> constexpr (use_option)</div>

  204. <div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;        {</div>

  205. <div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;            value = std::move(ov).value();</div>

  206. <div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;            ov = std::nullopt;</div>

  207. <div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;        }</div>

  208. <div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;        <span class="keywordflow">else</span></div>

  209. <div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;        {</div>

  210. <div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;            value = std::move(ov);</div>

  211. <div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;        }</div>

  212. <div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160; </div>

  213. <div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;        m_readIndex = nextIndex(m_readIndex);</div>

  214. <div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160; </div>

  215. <div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;<span class="preprocessor">    #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>

  216. <div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;        m_count.fetch_sub(1, std::memory_order_acq_rel);</div>

  217. <div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;<span class="preprocessor">    #endif</span></div>

  218. <div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;        <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>

  219. <div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    }</div>

  220. <div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;}</div>

  221. </div><!-- fragment --></div><!-- contents -->

  222. <!-- start footer part -->

  223. <hr class="footer"/><address class="footer"><small>

  224. 制作者 &#160;<a href="http://www.doxygen.org/index.html">

  225. <img class="footer" src="doxygen.png" alt="doxygen"/>

  226. </a> 1.8.17

  227. </small></address>

  228. </body>

  229. </html>