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<title>librf: resumef::awaitable_t< _Ty > 模板结构体 参考</title>
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<li class="navelem"><b>resumef</b></li><li class="navelem"><a class="el" href="structresumef_1_1awaitable__t.html">awaitable_t</a></li> </ul>
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<a href="#pub-methods">Public 成员函数</a> |
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<a href="structresumef_1_1awaitable__t-members.html">所有成员列表</a> </div>
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<div class="headertitle">
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<div class="title">resumef::awaitable_t< _Ty > 模板结构体 参考</div> </div>
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</div><!--header-->
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<div class="contents">
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<p>用于包装‘异步函数’为‘可等待函数(awaitable function)’。
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<a href="structresumef_1_1awaitable__t.html#details">更多...</a></p>
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类 resumef::awaitable_t< _Ty > 继承关系图:</div>
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<div class="dyncontent">
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<div class="center">
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<img src="structresumef_1_1awaitable__t.png" usemap="#resumef::awaitable_5Ft_3C_20_5FTy_20_3E_map" alt=""/>
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<map id="resumef::awaitable_5Ft_3C_20_5FTy_20_3E_map" name="resumef::awaitable_5Ft_3C_20_5FTy_20_3E_map">
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<area href="structresumef_1_1awaitable__impl__t.html" title="awaitable_t<>的公共实现部分，用于减少awaitable_t<>的重复代码。" alt="resumef::awaitable_impl_t< _Ty >" shape="rect" coords="0,0,200,24"/>
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</map>
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</div></div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public 成员函数</h2></td></tr>
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<tr class="memitem:af66d4b4a3ba5339873b2dd8353ae6db3"><td class="memTemplParams" colspan="2">template<class U > </td></tr>
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<tr class="memitem:af66d4b4a3ba5339873b2dd8353ae6db3"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structresumef_1_1awaitable__t.html#af66d4b4a3ba5339873b2dd8353ae6db3">set_value</a> (U &&value) const</td></tr>
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<tr class="memdesc:af66d4b4a3ba5339873b2dd8353ae6db3"><td class="mdescLeft"> </td><td class="mdescRight">设置可等待函数的返回值。 <a href="structresumef_1_1awaitable__t.html#af66d4b4a3ba5339873b2dd8353ae6db3">更多...</a><br /></td></tr>
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<tr class="separator:af66d4b4a3ba5339873b2dd8353ae6db3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="inherit_header pub_methods_structresumef_1_1awaitable__impl__t"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_structresumef_1_1awaitable__impl__t')"><img src="closed.png" alt="-"/> Public 成员函数 继承自 <a class="el" href="structresumef_1_1awaitable__impl__t.html">resumef::awaitable_impl_t< _Ty ></a></td></tr>
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<tr class="memitem:a22f1adeb8ecfd2c078f620dbc7c368a1 inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="structresumef_1_1awaitable__impl__t.html#a22f1adeb8ecfd2c078f620dbc7c368a1">set_exception</a> (std::exception_ptr e) const</td></tr>
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<tr class="memdesc:a22f1adeb8ecfd2c078f620dbc7c368a1 inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="mdescLeft"> </td><td class="mdescRight">发生了异常后，设置异常。 <a href="structresumef_1_1awaitable__impl__t.html#a22f1adeb8ecfd2c078f620dbc7c368a1">更多...</a><br /></td></tr>
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<tr class="separator:a22f1adeb8ecfd2c078f620dbc7c368a1 inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a2f7b2ef525186c9b7512dceb2453bebe inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="memTemplParams" colspan="2"><a id="a2f7b2ef525186c9b7512dceb2453bebe"></a>
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template<class _Exp > </td></tr>
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<tr class="memitem:a2f7b2ef525186c9b7512dceb2453bebe inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structresumef_1_1awaitable__impl__t.html#a2f7b2ef525186c9b7512dceb2453bebe">throw_exception</a> (_Exp e) const</td></tr>
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<tr class="memdesc:a2f7b2ef525186c9b7512dceb2453bebe inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="mdescLeft"> </td><td class="mdescRight">在协程内部，重新抛出之前设置的异常。 <br /></td></tr>
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<tr class="separator:a2f7b2ef525186c9b7512dceb2453bebe inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a647bd5f5a5572bbbe8a17000ea5dc06d inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="memItemLeft" align="right" valign="top"><a id="a647bd5f5a5572bbbe8a17000ea5dc06d"></a>
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<a class="el" href="structresumef_1_1future__t.html">future_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structresumef_1_1awaitable__impl__t.html#a647bd5f5a5572bbbe8a17000ea5dc06d">get_future</a> () noexcept</td></tr>
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<tr class="memdesc:a647bd5f5a5572bbbe8a17000ea5dc06d inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="mdescLeft"> </td><td class="mdescRight">获得与之关联的future_t<>对象，作为可等待函数(awaitable function)的返回值。 <br /></td></tr>
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<tr class="separator:a647bd5f5a5572bbbe8a17000ea5dc06d inherit pub_methods_structresumef_1_1awaitable__impl__t"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="inherited"></a>
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额外继承的成员函数</h2></td></tr>
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<tr class="inherit_header pub_attribs_structresumef_1_1awaitable__impl__t"><td colspan="2" onclick="javascript:toggleInherit('pub_attribs_structresumef_1_1awaitable__impl__t')"><img src="closed.png" alt="-"/> Public 属性 继承自 <a class="el" href="structresumef_1_1awaitable__impl__t.html">resumef::awaitable_impl_t< _Ty ></a></td></tr>
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<tr class="memitem:af7b6df5bbe7392334d7914db0d878915 inherit pub_attribs_structresumef_1_1awaitable__impl__t"><td class="memItemLeft" align="right" valign="top"><a id="af7b6df5bbe7392334d7914db0d878915"></a>
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<a class="el" href="structresumef_1_1counted__ptr.html">counted_ptr</a>< <a class="el" href="structresumef_1_1state__t.html">state_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="structresumef_1_1awaitable__impl__t.html#af7b6df5bbe7392334d7914db0d878915">_state</a> = state_future_t::_Alloc_state<<a class="el" href="structresumef_1_1state__t.html">state_type</a>>(true)</td></tr>
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<tr class="memdesc:af7b6df5bbe7392334d7914db0d878915 inherit pub_attribs_structresumef_1_1awaitable__impl__t"><td class="mdescLeft"> </td><td class="mdescRight">管理的state_t<>对象。 <br /></td></tr>
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<tr class="separator:af7b6df5bbe7392334d7914db0d878915 inherit pub_attribs_structresumef_1_1awaitable__impl__t"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">详细描述</h2>
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<div class="textblock"><h3>template<class _Ty><br />
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struct resumef::awaitable_t< _Ty ></h3>
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<p>用于包装‘异步函数’为‘可等待函数(awaitable function)’。 </p>
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<p>通过返回一个‘可等待对象(awaitor)’，符合C++ coroutines的co_await所需的接口，来达成‘可等待函数(awaitable function)’。<br />
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这是扩展异步函数支持协程的重要手段。<br />
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<br />
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典型用法是申明一个 awaitable_t<>局部变量 awaitable，<br />
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在已经获得结果的情况下，直接调用 awaitable.set_value(value)设置返回值，使得可等待函数立即获得结果。<br />
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在不能立即获得结果的情况下，通过在异步的回调lambda里，捕获awaitable局部变量，<br />
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根据异步结果，要么调用 awaitable.set_value(value)设置结果值，要么调用 awaitable.set_exception(e)设置异常。<br />
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在设置值或者异常后，调用可等待函数的协程将得以继续执行。<br />
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此可等待函数通过 awaitable.get_future()返回与之关联的 future_t<>对象，作为协程的可等待对象。<br />
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<br />
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</p><dl class="params"><dt>参数</dt><dd>
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<table class="params">
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<tr><td class="paramname">_Ty</td><td>可等待函数(awaitable function)的返回类型。<br />
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要求至少支持移动构造和移动赋值。<br />
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_Ty 支持特化为 _Ty&，以及 void。 </td></tr>
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</table>
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</dd>
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</dl>
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</div><h2 class="groupheader">成员函数说明</h2>
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<a id="af66d4b4a3ba5339873b2dd8353ae6db3"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#af66d4b4a3ba5339873b2dd8353ae6db3">◆ </a></span>set_value()</h2>
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<div class="memitem">
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<div class="memproto">
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<div class="memtemplate">
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template<class _Ty > </div>
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<div class="memtemplate">
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template<class U > </div>
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<table class="mlabels">
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<tr>
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<td class="mlabels-left">
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<table class="memname">
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<tr>
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<td class="memname">void <a class="el" href="structresumef_1_1awaitable__t.html">resumef::awaitable_t</a>< _Ty >::set_value </td>
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<td>(</td>
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<td class="paramtype">U && </td>
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<td class="paramname"><em>value</em></td><td>)</td>
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<td> const</td>
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</tr>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">inline</span></span> </td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>设置可等待函数的返回值。 </p>
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<p>_Ty的void特化版本，则是不带参数的set_value()函数。 </p><dl class="params"><dt>参数</dt><dd>
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<table class="params">
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<tr><td class="paramname">value</td><td>返回值。必须支持通过value构造出_Ty类型。 </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section attention"><dt>注意</dt><dd>与set_exception()互斥。调用了set_value(value)后，不能再调用set_exception(e)。 </dd></dl>
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</div>
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</div>
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<hr/>该结构体的文档由以下文件生成:<ul>
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<li>librf/src/<a class="el" href="awaitable_8h_source.html">awaitable.h</a></li>
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