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4 changes: 2 additions & 2 deletions 2018/04/25/C++/C++ 面向对象/构造函数的成员初始化列表(一)/index.html
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4 changes: 2 additions & 2 deletions 2018/05/07/C++/C++ 面向对象/using关键字与派生类部分重写函数/index.html
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} </script><meta name="generator" content="Hexo 5.4.0"></head><body><canvas class="fireworks"></canvas><i class="fa fa-arrow-right" id="toggle-sidebar" aria-hidden="true"></i><div id="sidebar"><div class="toggle-sidebar-info text-center"><span data-toggle="Toggle article">Toggle site</span><hr></div><div class="sidebar-toc"><div class="sidebar-toc__title">Catalog</div><div class="sidebar-toc__progress"><span class="progress-notice">You've read</span><span class="progress-num">0</span><span class="progress-percentage">%</span><div class="sidebar-toc__progress-bar"></div></div><div class="sidebar-toc__content"><ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#using-%E7%94%A8%E5%81%9A-alias"><span class="toc-number">1.</span> <span class="toc-text">using 用做 alias</span></a></li></ol></div></div><div class="author-info hide"><div class="author-info__avatar text-center"><img src="https://s2.loli.net/2022/02/17/HQaCXUBn64zsMIL.png"></div><div class="author-info__name text-center">Charon Cheung</div><div class="author-info__description text-center"></div><hr><div class="author-info-articles"><a class="author-info-articles__archives article-meta" href="/archives"><span class="pull-left">Articles</span><span class="pull-right">650</span></a><a class="author-info-articles__tags article-meta" href="/tags"><span class="pull-left">Tags</span><span class="pull-right">6</span></a><a class="author-info-articles__categories article-meta" href="/categories"><span class="pull-left">Categories</span><span class="pull-right">51</span></a></div></div></div><div id="content-outer"><div id="top-container" style="background-image: url(https://s2.loli.net/2022/11/17/QOR8cePIS5NdDrK.jpg)"><div id="page-header"><span class="pull-left"> <a id="site-name" href="/">沉默杀手</a></span><i class="fa fa-bars toggle-menu pull-right" aria-hidden="true"></i><span class="pull-right menus"><a class="site-page" href="/">Home</a><a class="site-page" href="/archives">Archives</a><a class="site-page" href="/tags">Tags</a><a class="site-page" href="/categories">Categories</a></span></div><div id="post-info"><div id="post-title">using关键字</div><div id="post-meta"><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2018-05-07</time><span class="post-meta__separator">|</span><i class="fa fa-inbox post-meta__icon" aria-hidden="true"></i><a class="post-meta__categories" href="/categories/C/">C++</a><i class="fa fa-angle-right" aria-hidden="true"></i><i class="fa fa-inbox post-meta__icon" aria-hidden="true"></i><a class="post-meta__categories" href="/categories/C/C-%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1/">C++ 面向对象</a><span class="post-meta__separator">|</span><i class="fa fa-comment-o post-meta__icon" aria-hidden="true"></i><a href="/2018/05/07/C++/C++%20%20%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1/using%E5%85%B3%E9%94%AE%E5%AD%97%E4%B8%8E%E6%B4%BE%E7%94%9F%E7%B1%BB%E9%83%A8%E5%88%86%E9%87%8D%E5%86%99%E5%87%BD%E6%95%B0/#disqus_thread"><span class="disqus-comment-count" data-disqus-identifier="2018/05/07/C++/C++ 面向对象/using关键字与派生类部分重写函数/"></span></a><div class="post-meta-wordcount"><span>Word count: </span><span class="word-count">581</span><span class="post-meta__separator">|</span><span>Reading time: 2 min</span></div></div></div></div><div class="layout" id="content-inner"><article id="post"><div class="article-container" id="post-content"><p>引入命名空间，<strong>一个 using 声明一次只引入一个命名空间，这个不用讲了</strong></p>
} </script><meta name="generator" content="Hexo 5.4.0"></head><body><canvas class="fireworks"></canvas><i class="fa fa-arrow-right" id="toggle-sidebar" aria-hidden="true"></i><div id="sidebar"><div class="toggle-sidebar-info text-center"><span data-toggle="Toggle article">Toggle site</span><hr></div><div class="sidebar-toc"><div class="sidebar-toc__title">Catalog</div><div class="sidebar-toc__progress"><span class="progress-notice">You've read</span><span class="progress-num">0</span><span class="progress-percentage">%</span><div class="sidebar-toc__progress-bar"></div></div><div class="sidebar-toc__content"><ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#using-%E7%94%A8%E5%81%9A-alias"><span class="toc-number">1.</span> <span class="toc-text">using 用做 alias</span></a></li></ol></div></div><div class="author-info hide"><div class="author-info__avatar text-center"><img src="https://s2.loli.net/2022/02/17/HQaCXUBn64zsMIL.png"></div><div class="author-info__name text-center">Charon Cheung</div><div class="author-info__description text-center"></div><hr><div class="author-info-articles"><a class="author-info-articles__archives article-meta" href="/archives"><span class="pull-left">Articles</span><span class="pull-right">650</span></a><a class="author-info-articles__tags article-meta" href="/tags"><span class="pull-left">Tags</span><span class="pull-right">6</span></a><a class="author-info-articles__categories article-meta" href="/categories"><span class="pull-left">Categories</span><span class="pull-right">51</span></a></div></div></div><div id="content-outer"><div id="top-container" style="background-image: url(https://s2.loli.net/2024/11/12/3hjaWzYEJVo6pxs.jpg)"><div id="page-header"><span class="pull-left"> <a id="site-name" href="/">沉默杀手</a></span><i class="fa fa-bars toggle-menu pull-right" aria-hidden="true"></i><span class="pull-right menus"><a class="site-page" href="/">Home</a><a class="site-page" href="/archives">Archives</a><a class="site-page" href="/tags">Tags</a><a class="site-page" href="/categories">Categories</a></span></div><div id="post-info"><div id="post-title">using关键字</div><div id="post-meta"><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2018-05-07</time><span class="post-meta__separator">|</span><i class="fa fa-inbox post-meta__icon" aria-hidden="true"></i><a class="post-meta__categories" href="/categories/C/">C++</a><i class="fa fa-angle-right" aria-hidden="true"></i><i class="fa fa-inbox post-meta__icon" aria-hidden="true"></i><a class="post-meta__categories" href="/categories/C/C-%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1/">C++ 面向对象</a><span class="post-meta__separator">|</span><i class="fa fa-comment-o post-meta__icon" aria-hidden="true"></i><a href="/2018/05/07/C++/C++%20%20%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1/using%E5%85%B3%E9%94%AE%E5%AD%97%E4%B8%8E%E6%B4%BE%E7%94%9F%E7%B1%BB%E9%83%A8%E5%88%86%E9%87%8D%E5%86%99%E5%87%BD%E6%95%B0/#disqus_thread"><span class="disqus-comment-count" data-disqus-identifier="2018/05/07/C++/C++ 面向对象/using关键字与派生类部分重写函数/"></span></a><div class="post-meta-wordcount"><span>Word count: </span><span class="word-count">581</span><span class="post-meta__separator">|</span><span>Reading time: 2 min</span></div></div></div></div><div class="layout" id="content-inner"><article id="post"><div class="article-container" id="post-content"><p>引入命名空间，<strong>一个 using 声明一次只引入一个命名空间，这个不用讲了</strong></p>
<p>使用class有时可能会遇到这种情况：基类中的函数func有多个重载版本，但是派生类只对版本1进行了重定义。 结果派生类<font color = blue size =3> 隐藏 </font>了基类中所有版本，通过派生类只能访问重定义的版本1，不能再访问基本的版本2,3,4，则派生类要么重定义所有重载版本，或者一个也不重定义。 如果基类中重载版本太多，在派生类中全重定义一遍就太麻烦了。</p>
<p>这就是<code>using</code>关键字适用的场合，可以在派生类中为重载成员名称提供 using 声明，使派生类使用的全是基类的函数版本。在此基础上，再重定义需要的那些函数，其他版本仍是基类的版本。</p>
<p>说的太抽象了，看代码：<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Base</span></span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line"> <span class="built_in">Base</span>() &#123;&#125;</span><br><span class="line"> <span class="keyword">virtual</span> ~<span class="built_in">Base</span>() &#123;&#125;</span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">virtual</span> <span class="keyword">void</span> <span class="title">func</span><span class="params">(<span class="keyword">int</span> i)</span> </span>&#123; std::cout &lt;&lt; <span class="string">&quot;func in base &quot;</span> &lt;&lt;i&lt;&lt; endl;&#125;</span><br><span class="line"> <span class="function"><span class="keyword">virtual</span> <span class="keyword">void</span> <span class="title">func</span><span class="params">(<span class="keyword">float</span> i)</span> </span>&#123; std::cout &lt;&lt; <span class="string">&quot;func in base &quot;</span> &lt;&lt;i&lt;&lt; endl;&#125;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Derived</span> :</span> <span class="keyword">public</span> Base</span><br><span class="line">&#123;</span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line"> <span class="built_in">Derived</span>() &#123;&#125;</span><br><span class="line"> <span class="comment">// using Base::func;</span></span><br><span class="line"> <span class="function"><span class="keyword">virtual</span> <span class="keyword">void</span> <span class="title">func</span><span class="params">(<span class="keyword">int</span> i)</span> </span>&#123; std::cout &lt;&lt; <span class="string">&quot;func in derived &quot;</span> &lt;&lt;i*<span class="number">5</span>&lt;&lt; endl;&#125;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"> Derived d;</span><br><span class="line"> d.<span class="built_in">func</span>(<span class="number">12</span>);</span><br><span class="line"> d.<span class="built_in">func</span>(<span class="built_in"><span class="keyword">float</span></span>(<span class="number">12.20</span>));</span><br></pre></td></tr></table></figure></p>
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