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<!DOCTYPE html><html lang="zh-CN" data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0,viewport-fit=cover"><title>一个普通的博客网站 - 一个网站</title><meta name="author" content="Grave"><meta name="copyright" content="Grave"><meta name="format-detection" content="telephone=no"><meta name="theme-color" content="#ffffff"><meta property="og:type" content="website">
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})(window)</script><meta name="generator" content="Hexo 7.3.0"></head><body><div id="web_bg"></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img is-center"><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/net_img/head.jpg" onerror="onerror=null;src='/img/friend_404.gif'" alt="avatar"/></div><div class="sidebar-site-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">1</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">0</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">7</div></a></div><hr class="custom-hr"/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 归档</span></a></div><div 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id="page-header" style="background-image: url('/net_img/head.jpg')"><nav id="nav"><span id="blog-info"><a href="/" title="一个普通的博客网站"></a></span><div id="menus"><div id="search-button"><a class="site-page social-icon search" href="javascript:void(0);"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 归档</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> Tags</span></a></div><div class="menus_item"><a class="site-page group" href="javascript:void(0);"><i class="fa-fw fas fa-list"></i><span> List</span><i class="fas fa-chevron-down"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/music/"><i class="fa-fw fas fa-music"></i><span> Music</span></a></li><li><a class="site-page child" href="/movies/"><i class="fa-fw fas fa-video"></i><span> Movie</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> Link</span></a></div><div class="menus_item"><a class="site-page" href="/comments/"><i class="fa-fw fas fa-envelope-open"></i><span> 留言板</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> About</span></a></div></div><div id="toggle-menu"><a class="site-page" href="javascript:void(0);"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="site-info"><h1 id="site-title">一个普通的博客网站</h1><div id="site-subtitle"><span id="subtitle"></span></div><div id="site_social_icons"><a class="social-icon" href="https://github.com/SophieYaninglettice" target="_blank" title="Github"><i class="fab fa-github" style="color: #24292e;"></i></a><a class="social-icon" href="https://space.bilibili.com/337745337" target="_blank" title="bilibili"><i class="fas fa-envelope" style="color: #4a7dbe;"></i></a></div></div><div id="scroll-down"><i class="fas fa-angle-down scroll-down-effects"></i></div></header><main class="layout" id="content-inner"><div class="recent-posts" id="recent-posts"><div class="recent-post-item"><div class="post_cover left"><a href="/2024/10/10/STL%E5%AE%B9%E5%99%A8Array/" title="STL标准容器库核心原理实现：std::array笔记"><img class="post-bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/net_img/background.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="STL标准容器库核心原理实现：std::array笔记"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/10/10/STL%E5%AE%B9%E5%99%A8Array/" title="STL标准容器库核心原理实现：std::array笔记">STL标准容器库核心原理实现：std::array笔记</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2024-10-10T10:00:00.000Z" title="发表于 2024-10-10 18:00:00">2024-10-10</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-01-14T10:00:00.000Z" title="更新于 2022-01-14 18:00:00">2022-01-14</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Sports/">Sports</a><i class="fas fa-angle-right article-meta-link"></i><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Sports/Baseball/">Baseball</a><i class="fas fa-angle-right article-meta-link"></i><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/MLB/">MLB</a><i class="fas fa-angle-right article-meta-link"></i><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/MLB/American-League/">American League</a><i class="fas fa-angle-right article-meta-link"></i><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/MLB/American-League/Boston-Red-Sox/">Boston Red Sox</a><i class="fas fa-angle-right article-meta-link"></i><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/MLB/American-League/New-York-Yankees/">New York Yankees</a><i class="fas fa-angle-right article-meta-link"></i><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Rivalries/">Rivalries</a></span></div><div class="content">STL标准容器库 array 的一个简单实现为什么引入std::array?引入std::array，而非使用原生数组有以下原因：
与原生数组相比，std::array拥有更好的类型安全和边界检查
std::array是对原生数组进行了封装，拥有新的特性的同时更加安全和现代化
支持所有标准库特性，拥有和原生数组接近的效率，在大部分情况可以完全取代原生数组。
原生数组 VS std::array 类型安全与边界检查原生数组
原生数组只提供了最基础的类型检查，原生数组在声明时指定类型，并在编译时进行类型检查。例如：
1234 /* 抛出narrowing conversion,是指在类型转换过程中，从一种数据类型转换为另一种可能导致数据精度或范围丢失的类型转换 在列表初始化中，编译器会检查是否存在 narrowing conversion。如果存在，则会导致编译错误。*/int arr[5] {0.2};// ，arr[0] = 3.14; // 精度损失
某些情况下，原生数组会退化为指针，这可能导致类型安全性问题
12345678 ...</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span></div></nav></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/net_img/head.jpg" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">Grave</div><div class="author-info__description"></div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">1</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">0</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">7</div></a></div><a id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/xxxxxx"><i class="fab fa-github"></i><span>Follow Me</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/SophieYaninglettice" target="_blank" title="Github"><i class="fab fa-github" style="color: #24292e;"></i></a><a class="social-icon" href="https://space.bilibili.com/337745337" target="_blank" title="bilibili"><i class="fas fa-envelope" style="color: #4a7dbe;"></i></a></div></div><div class="sticky_layout"><div class="card-widget card-categories"><div class="item-headline">
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<li class="card-category-list-item "><a class="card-category-list-link" href="/categories/MLB/"><span class="card-category-list-name">MLB</span><span class="card-category-list-count">2</span></a><ul class="card-category-list child"><li class="card-category-list-item "><a class="card-category-list-link" href="/categories/MLB/American-League/"><span class="card-category-list-name">American League</span><span class="card-category-list-count">2</span></a><ul class="card-category-list child"><li class="card-category-list-item "><a class="card-category-list-link" href="/categories/MLB/American-League/Boston-Red-Sox/"><span class="card-category-list-name">Boston Red Sox</span><span class="card-category-list-count">1</span></a></li><li class="card-category-list-item "><a class="card-category-list-link" href="/categories/MLB/American-League/New-York-Yankees/"><span class="card-category-list-name">New York Yankees</span><span class="card-category-list-count">1</span></a></li></ul></li></ul></li><li class="card-category-list-item "><a class="card-category-list-link" href="/categories/Rivalries/"><span class="card-category-list-name">Rivalries</span><span class="card-category-list-count">1</span></a></li><li class="card-category-list-item "><a class="card-category-list-link" href="/categories/Sports/"><span class="card-category-list-name">Sports</span><span class="card-category-list-count">1</span></a><ul class="card-category-list child"><li class="card-category-list-item "><a class="card-category-list-link" href="/categories/Sports/Baseball/"><span class="card-category-list-name">Baseball</span><span class="card-category-list-count">1</span></a></li></ul></li>
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