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explicit修飾
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<div class="post-body" itemprop="articleBody"><p>C++中，有所謂的顯性轉換跟隱性轉換</p>
<p>在宣告時，加入explicit 這個關鍵字，可以禁止使用顯性轉換，以下為例</p>
<figure class="highlight c++"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">using</span> <span class="keyword">namespace</span> std;</span><br><span class="line"><span class="keyword">class</span> <span class="title class_">Stack</span> {</span><br><span class="line"> <span class="keyword">public</span>:</span><br><span class="line"> <span class="built_in">Stack</span>(<span class="type">int</span> a){};</span><br><span class="line">};</span><br><span class="line"><span class="function"><span class="type">void</span> <span class="title">Test</span><span class="params">(Stack b)</span></span>{</span><br><span class="line">}</span><br><span class="line"><span class="function"><span class="type">int</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> Stack s1 = <span class="number">1</span>; <span class="comment">//ok</span></span><br><span class="line"> Stack s2 = <span class="built_in">Stack</span>(<span class="number">12</span>); <span class="comment">//ok</span></span><br><span class="line"> <span class="function">Stack <span class="title">s3</span><span class="params">(s1)</span></span>; <span class="comment">//ok</span></span><br><span class="line"> <span class="built_in">Test</span>(<span class="number">123</span>); <span class="comment">//ok</span></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<figure class="highlight c++"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">using</span> <span class="keyword">namespace</span> std;</span><br><span class="line"><span class="keyword">class</span> <span class="title class_">Stack</span> {</span><br><span class="line"> <span class="keyword">public</span>:</span><br><span class="line"> <span class="function"><span class="keyword">explicit</span> <span class="title">Stack</span><span class="params">(<span class="type">int</span>)</span></span>{};</span><br><span class="line">};</span><br><span class="line"><span class="function"><span class="type">void</span> <span class="title">Test</span><span class="params">(Stack b)</span></span>{</span><br><span class="line">}</span><br><span class="line"><span class="function"><span class="type">int</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> Stack s1 = <span class="number">123</span>; <span class="comment">//error</span></span><br><span class="line"> Stack s2 = <span class="built_in">Stack</span>(<span class="number">123</span>); <span class="comment">//ok</span></span><br><span class="line"> <span class="function">Stack <span class="title">s3</span><span class="params">(s1)</span></span>; <span class="comment">//ok</span></span><br><span class="line"> <span class="built_in">Test</span>(<span class="number">123</span>); <span class="comment">// error</span></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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