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2019-01-13-C++成员函数的特性.html
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<h1 class="post-title" itemprop="name headline">C++成员函数的特性之【内外联函数】</h1>
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<p>类的成员函数分为内联函数和外联函数。</p>
<h1 id="内联函数"><a href="#内联函数" class="headerlink" title="内联函数"></a>内联函数</h1><p>指的是定义带类体内的成员函数，即函数体放在类体内。<br>内联函数与带参数的宏定义比较，效率是一样的。</p>
<h1 id="外联函数"><a href="#外联函数" class="headerlink" title="外联函数"></a>外联函数</h1><p>说明放在类体内，定义放在类体外的成员函数叫外联函数。<br>外联函数的函数体在类的实现部分。<br>外联函数编程内联函数的方法很简单，只要在函数头的前面加上关键字<code>inline</code>即可。</p>
<h1 id="例子"><a href="#例子" class="headerlink" title="例子"></a>例子</h1><figure class="highlight zephir"><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><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">A</span></span>{</span><br><span class="line"> <span class="keyword">public</span>:</span><br><span class="line"> A(<span class="keyword">int</span> x, <span class="keyword">int</span> y){</span><br><span class="line"> X = x;</span><br><span class="line"> Y = y;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">int</span> a(){</span><br><span class="line"> <span class="keyword">return</span> X;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">int</span> b(){</span><br><span class="line"> <span class="keyword">return</span> Y;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">int</span> c();</span><br><span class="line"> <span class="keyword">int</span> d();</span><br><span class="line"> <span class="keyword">private</span>:</span><br><span class="line"> <span class="keyword">int</span> X,Y;</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line">inline <span class="keyword">int</span> A::c(){</span><br><span class="line"> <span class="keyword">return</span> a() + b();</span><br><span class="line">}</span><br><span class="line">inline <span class="keyword">int</span> A::d(){</span><br><span class="line"> <span class="keyword">return</span> c();</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">#include <iostream.h></span></span><br><span class="line">void main(){</span><br><span class="line"> A m(<span class="number">3</span>,<span class="number">5</span>);</span><br><span class="line"> <span class="keyword">int</span> i = m.d();</span><br><span class="line"> cout<<<span class="string">"d() return: <<i<<endl;</span></span><br><span class="line"><span class="string">}</span></span><br></pre></td></tr></table></figure>
<p>执行结果为：<br><code>d() return: 8</code><br>说明：类A中，直接定义了3个内联函数，又使用<code>inline</code>关键字定义了两个内联函数。<br><strong>内联函数一定要在调用之前进行定义，且不能递归调用。</strong></p>
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