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<a href="/2023/04/23/RuntimeError-GET-was-unable-to-find-an-engine-to-execute-this-computation%E8%A7%A3%E5%86%B3%E8%AE%B0%E5%BD%95/" class="post-title-link" itemprop="url">RuntimeError: GET was unable to find an engine to execute this computation解决记录</a>
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<p>想尝试使用yolov5的源码跑数据的时候，环境配置好后，在测试是否能够跑数据的时候出现这个bug</p>
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<p>Mac m1 配置vscode c++环境，比较难搞，记录下</p>
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<h2 id="overview-of-c">Overview of C++</h2>
<h3 id="the-structure-of-a-c-program">The structure of a C++ program</h3>
<figure>
<img src="http://image-bed.limit-infinite.top/images/blog/2023-04-11-125852.png" alt="image-20230411205849726" /><figcaption aria-hidden="true">image-20230411205849726</figcaption>
</figure>
<h3 id="comments">comments</h3>
<p>语法：<code>/*...*/</code> or <code>//</code>，前者是多行注释，后者是单行注释</p>
<h3 id="library-inclusions">Library inclusions</h3>
<blockquote>
<p><strong>#include <iostream></strong></p>
</blockquote>
<p>This line instructs the C++ compiler to read the relevant definitions from what is called a <strong>header file.</strong></p>
<p>Those header files typically end with the suffix <strong>.h</strong> and are enclosed in quotation marks instead of angle brackets.</p>
<p>可是在开发大项目的时候，头文件很多，可能会出现头文件名字重复的问题，那么为了解决这个问题，c++提出了<code>namespaces</code>这个东西。</p>
<p>To ensure that the names defined in different parts of a large system do not interfere with one another, the designers of C++ made it possible to segment code into structures called <strong>namespaces,</strong> each of which keeps track of its own set of names.</p>
<p>The standard C++ libraries use a namespace called <strong>std</strong></p>
<p>Increasingly, professional C++ programmers specify the namespace explicitly by adding the prefix <strong>std::</strong> before each name to which it applies. Using this approach, the first line of the <strong>HelloWorld</strong> program becomes</p>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">std</span>::<span class="built_in">cout</span> << <span class="string">"hello, world"</span> << <span class="built_in">std</span>::<span class="built_in">endl</span>;</span><br></pre></td></tr></table></figure>
<h3 id="function-prototypes">Function prototypes</h3>
<p>函数原型</p>
<p>Although the definitions of these functions appear toward the end of the file, the <strong>PowersOfTwo</strong> program provides a concise description of the <strong>raiseToPower</strong> function just after the library inclusions. This concise form is called a <strong>prototype</strong> and makes it possible to make calls to that function before its actual definition appears.</p>
<h3 id="the-main-program">The main program</h3>
<p>Every C++ program must contain a function with the name <strong>main</strong>. This function specifies the starting point for the computation and is called when the program starts up. When <strong>main</strong> has finished its work and returns, execution of the program ends.</p>
<h3 id="name-conventions">Name conventions</h3>
<h2 id="defining-functions-in-c">Defining functions in C++</h2>
<h3 id="overloading">Overloading</h3>
<p>Using the same name for more than one version of a function is called <strong>overloading.</strong> The pattern of arguments taken by a function—which refers only to the number and types of the arguments and not the parameter names—is called its <strong>signature.</strong></p>
<p>The compiler chooses which of these versions to invoke by looking at the types of the arguments the caller provides.</p>
<p>The primary advantage of using overloading is that doing so makes it easier for you as a programmer to keep track of different function names for the same operation when it is applied in slightly different contexts.</p>
<p>If, for example, you need to call the absolute value function in C, which does not support overloading, you have to remember to call <strong>fabs</strong> for floating-point numbers and <strong>abs</strong> for integers. In C++, all you need to remember is the single function name <strong>abs</strong>.</p>
<h3 id="the-steps-in-calling-a-function">The steps in calling a function</h3>
<figure>
<img src="http://image-bed.limit-infinite.top/images/blog/2023-04-24-074045.png" alt="image-20230424154040478" /><figcaption aria-hidden="true">image-20230424154040478</figcaption>
</figure>
<figure>
<img src="http://image-bed.limit-infinite.top/images/blog/2023-04-24-074103.png" alt="image-20230424154100453" /><figcaption aria-hidden="true">image-20230424154100453</figcaption>
</figure>
<p>跟cs61A上的函数调用过程是一致的，但是这个没图，python那个有图介绍，更清楚些。</p>
<h3 id="reference-parameters">Reference parameters</h3>
<p>如果需要在函数中修改传递进去的参数，需要将参数变为<code>reference parameters</code>，在定义函数的时候，需要在参数名字前加上<code>&</code>符号。</p>
<p>比如：</p>
<blockquote>
<p>void setToZero(int & x);</p>
</blockquote>
<p>用途：</p>
<p>In C++, one of the most common uses of call by reference occurs when a function needs to return more than one value to the calling program.</p>
<p>就是把函数作为一个过程，修改传递进去的参数的值，从而达到返回多个结果的效果</p>
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<time title="修改时间：2023-09-25 02:38:23" itemprop="dateModified" datetime="2023-09-25T02:38:23+08:00">2023-09-25</time>
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