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ParamType 具有指针或引用型别，但不是万能引用类型推导规则如下： 若expr具有引用类型，先将引用部分忽略。 然后，对expr的类型和ParamType的类型执行模式匹配，来决定T的类型。 举例模式声明如下： 12template<typename T> void f(T& param); // param 是个引用 声明下列变量： 123int x = 27; // x 的类型是 intconst int xx= x; // cx 的类型是 const intconst int& rx = x; // rx 是 x 的类型为 const int 的引用 各次调用的推导结果如下： 12...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/43ae7cb1.html" title="Item3：理解 decltype 类型推导"><img class="post-bg" src="/./img/cover.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Item3：理解 decltype 类型推导"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/43ae7cb1.html" title="Item3：理解 decltype 类型推导">Item3：理解 decltype 类型推导</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 datetime="2026-03-15T12:00:00.000Z" title="发表于 2026-03-15 20:00:00">2026-03-15</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/Effective-Modern-C/">Effective Modern C++</a></span></div><div class="content">个人认为原著写的非常晦涩难懂，所以精简如下： decltype用于告知名字或表达式的类型： 1234567891011121314151617181920212223const int i = 0; // decltype(i) 是 const intbool f(const Widget& w); // decltype(w) 是 const Widget&；decltype(f) 是 bool(const Widget&)struct Point { int x, y;}; // decltype(Point::x) 是 int；decltype(Point::y) 是 intWidget w; // decltype(w) 是 Widgetif (f(w)) ... // decltype(f(w)) 是 booltemplate<typename T&...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/43ae7cb1.html" title="Item2：理解 auto 类型推导"><img class="post-bg" src="/./img/cover.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Item2：理解 auto 类型推导"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/43ae7cb1.html" title="Item2：理解 auto 类型推导">Item2：理解 auto 类型推导</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 datetime="2026-03-15T12:00:00.000Z" title="发表于 2026-03-15 20:00:00">2026-03-15</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/Effective-Modern-C/">Effective Modern C++</a></span></div><div class="content">推导方式和[[1. 理解模板类型推导]]一致，下面讨论不同点： 在初始化时，采用auto声明变量相比于采用固定类型声明变量更具优势。下列声明都能通过编译，但是结果却并不相同： 1234auto x1 = 27; // 类型是int，值是27auto x2(27); // 同上auto x3 = {27}; // 类型是std::initializer_list<int>，值是{27}auto x4{27}; //同上 当用于auto声明变量的初始化表达式是使用大括号时，推导所得类型就属于std::initializer_list<int>。如果类型推导失败（例如大括号里的值类型不一样），代码就不通过编译： 1auto x5 = {1,2,3.0}; // 错误，推导不出std::initializer_list<T>中的T 这里发生了两次类型推导： auto的使用：x5的类型需要推导，由于x5的初始表达式是用大括号，所以x5必须推导为一个std::initi...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/43ae7cb1.html" title="Item4：掌握查看类型推导结果的方法"><img class="post-bg" src="/./img/cover.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Item4：掌握查看类型推导结果的方法"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/43ae7cb1.html" title="Item4：掌握查看类型推导结果的方法">Item4：掌握查看类型推导结果的方法</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 datetime="2026-03-15T12:00:00.000Z" title="发表于 2026-03-15 20:00:00">2026-03-15</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/Effective-Modern-C/">Effective Modern C++</a></span></div><div class="content">采用何种工具来查看型别推导结果，取决于在软件开发过程的哪个阶段需要该信息。三个可能的阶段：撰写代码阶段、编译阶段和运行时阶段。 IDE编辑器IDE 中的代码编辑器通常会在你将鼠标指针悬停至某个程序实体，如变量、形参、函数等时，显示出该实体的类型。例如： 1234const int theAnswer = 42;auto x = theAnswer;auto y = &theAnswer; IDE 编辑器很可能会显示出，x 的类型推导结果是 int, 而 y 则是 const int*。 但是如果遇到较为复杂的类型，IDE显示的信息就不太有用了。 编译器诊断信息一条有效途径是使用该类型导致某些编译错误。而报告错误的消息几乎肯定会提及导致该错误的类型。 例如： 12template<typename T> //只声明TD而不定义class TD; // TD是“类型显示类”的缩写 只要试图具现该模板，就会诱发一个错误信息，原因是找不到具现模板所需要的定义。 运行时输出使用 printf来显示类型信息，这种方法只有到了运行期才能使用，却可以对类型输出的格式提供完...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/43ae7cb1.html" title="Item10：优先选用限域枚举，而非不限域枚举"><img class="post-bg" src="/./img/cover.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Item10：优先选用限域枚举，而非不限域枚举"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/43ae7cb1.html" title="Item10：优先选用限域枚举，而非不限域枚举">Item10：优先选用限域枚举，而非不限域枚举</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 datetime="2026-03-15T12:00:00.000Z" title="发表于 2026-03-15 20:00:00">2026-03-15</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/Effective-Modern-C/">Effective Modern C++</a></span></div><div class="content">使用限域enum来减少命名空间污染通用规则：如果在一对大括号里声明一个名字，则该名字的可见性限定在括号括起来的作用域内。 但这个规则不适用于 C++98 风格的枚举类型中定义的枚举变量：枚举变量的属于包含着这个枚举类型的作用域，此作用域内不能有其他实体取相同的名字。 12enum Color { black, white, red }; //black, white, red在Color所在的作用域auto white = false; //错误! white早已在这个作用域中声明 枚举量的名字泄露到枚举类型所在作用域的现象被称为：不限范围的枚举类型（未限域 enum）。 在 C++11 中，限定作用域的枚举类型（枚举类 / 限域 enum）不会以这样的方式泄露名字： 123456enum class Color { black, white, red }; //black, white, red限制在Color域内auto white = false; //没问题，域内没有其他“white”Color c = white; /...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/43ae7cb1.html" title="Item12：使用override重写声明函数"><img class="post-bg" src="/./img/cover.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Item12：使用override重写声明函数"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/43ae7cb1.html" title="Item12：使用override重写声明函数">Item12：使用override重写声明函数</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 datetime="2026-03-15T12:00:00.000Z" title="发表于 2026-03-15 20:00:00">2026-03-15</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/Effective-Modern-C/">Effective Modern C++</a></span></div><div class="content">面向对象编程的基本理念是：在派生类中虚函数实现，会改写基类中对应虚函数的实现。 虚函数重写的约束条件要想重写一个函数，必须满足下列要求： 基类中的函数必须是虚函数。 基类和派生类中的函数名字必须完全相同（析构函数例外）。 基类和派生类中的函数形参类型必须完全相同。 基类和派生类中的函数常量性必须完全相同。 基类和派生类中的函数返回值和异常规格必须兼容。 基类和派生类中的函数引用限定符必须完全相同。（C++11新增） 引用限定符：限定类的非静态成员函数只能被左值对象或右值对象调用。带&的成员函数仅允许左值对象调用；带&&的成员函数仅允许右值对象调用。 如果基类中的虚函数带有引用饰词，则派生类要对该函数进行改写版本必须也带有完全相同的引用饰词。否则相当于重新定义了一个新的函数。 编译器可能不报警但是存在错误的例子： 123456789101112131415class Base {public: virtual void mf1() const; virtual void mf2(int x); virtual void m...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/43ae7cb1.html" title="Item6：当auto推导的类型不符合要求时，使用显式类型初始化习惯用法"><img class="post-bg" src="/./img/cover.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Item6：当auto推导的类型不符合要求时，使用显式类型初始化习惯用法"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/43ae7cb1.html" title="Item6：当auto推导的类型不符合要求时，使用显式类型初始化习惯用法">Item6：当auto推导的类型不符合要求时，使用显式类型初始化习惯用法</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 datetime="2026-03-15T12:00:00.000Z" title="发表于 2026-03-15 20:00:00">2026-03-15</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/Effective-Modern-C/">Effective Modern C++</a></span></div><div class="content">个人认为原著写的非常难懂，所以精简总结如下： auto与代理类的问题当使用auto进行类型推导时，如果表达式返回的是代理类，auto会推导出代理类型而不是被代理的实际类型，可能导致未定义行为。 例如： 123std::vector<bool> features(const Widget& w);bool highPriority = features(w)[5]; // 含义是w具有高优先级吗？processWidget(w, highPriority); // 按照w的优先级来处理 这段代码没有什么问题，但是如果把highPriority从显式类型改成auto： 12auto highPriority = features(w)[5]; // 危险！推导出std::vector<bool>::referenceprocessWidget(w, highPriority); // 可能产生未定义行为！ 原因： std::vector<bool>内部使用紧凑结构存储（每个bool占1位） 内存最小寻址单位是字...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/43ae7cb1.html" title="Item5：优先使用 auto，而非显式类型声明"><img class="post-bg" src="/./img/cover.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Item5：优先使用 auto，而非显式类型声明"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/43ae7cb1.html" title="Item5：优先使用 auto，而非显式类型声明">Item5：优先使用 auto，而非显式类型声明</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 datetime="2026-03-15T12:00:00.000Z" title="发表于 2026-03-15 20:00:00">2026-03-15</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/Effective-Modern-C/">Effective Modern C++</a></span></div><div class="content">传统显示类型声明存在的问题1. 忘记初始化产生未知行为但是，auto声明的变量其类型推导自其初始化表达式，所以它们必须初始化： 123int x1; // 有潜在的未初始化风险 auto x2; // 编译错误！必须有初始化表达式auto x3 = 0; // 没问题， x 已经定义了 2. 类型冗长复杂，难以直接写出在泛型编程、容器操作等场景中，尝尝会出现冗长复杂的类型声明。如：typename std::iterator_traits<It>::value_type，可以直接使用auto代替。 12345// 传统显式声明：冗长繁琐，易出错 typename std::vector<int>::const_iterator it1 = vec.cbegin(); // auto 声明：简洁高效，无需记忆复杂类型 auto it2 = vec.cbegin(); 3. 类型不匹配导致意外的类型转换std::function是C++11标准库中的一个模板，它把函数指针的思想加以推广。函数指针只能指向函数，而std::function却可以指向任何可调用...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/43ae7cb1.html" title="Item13：优先选用const_iterator，而非iterator"><img class="post-bg" src="/./img/cover.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Item13：优先选用const_iterator，而非iterator"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/43ae7cb1.html" title="Item13：优先选用const_iterator，而非iterator">Item13：优先选用const_iterator，而非iterator</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 datetime="2026-03-15T12:00:00.000Z" title="发表于 2026-03-15 20:00:00">2026-03-15</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/Effective-Modern-C/">Effective Modern C++</a></span></div><div class="content">STL 的const_iterator等价于 “指向常量的指针（pointer-to-const）”，指向的值不可修改，符合 “能加const就加” 的通用编程准则 —— 只要无需修改迭代器指向的值，就应优先使用const_iterator；但该迭代器的实用性随 C++ 版本迭代大幅提升，C++11 是关键转折点，同时通用代码中需优先使用非成员函数版本的begin/end/cbegin等。 各 C++ 版本对 const_iterator 的支持差异1. C++98：支持残缺，实用性差const_iterator理论上符合规范，但实际使用存在两大痛点： 创建麻烦：非const容器无法直接获取const_iterator，需强制类型转换（或绑定到const引用）才能得到； 使用受限：insert/erase等容器操作仅接受iterator，且const_iterator无法可移植转换为iterator（即使reinterpret_cast也不行）； 最终导致开发者被迫放弃使用，违背 “能const则const” 的准则。 123456789101112typedef s...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/43ae7cb1.html" title="Item15：尽可能使用constexpr"><img class="post-bg" src="/./img/cover.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Item15：尽可能使用constexpr"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/43ae7cb1.html" title="Item15：尽可能使用constexpr">Item15：尽可能使用constexpr</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 datetime="2026-03-15T12:00:00.000Z" title="发表于 2026-03-15 20:00:00">2026-03-15</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/Effective-Modern-C/">Effective Modern C++</a></span></div><div class="content">constexpr作用于对象时，是加强版的const；但作用于函数时含义截然不同 —— 它并非简单限定 “返回 const 值” 或 “结果编译期可知”，而是根据调用场景动态适配。 constexpr对象：必然具备const只读属性，且必须由编译期可知的值完成初始化（技术上是翻译期，包含编译 + 链接，编程层面可视为编译期）。 constexpr函数：不保证返回值是 const，也不保证结果一定编译期可知—— 结果是否编译期确定，完全取决于传入的实参： 若实参是编译期已知的常量 → 结果在编译期计算，可用于 “整型常量表达式” 语境； 若实参是运行期才能确定的值 → 函数退化为普通函数，在运行期计算结果。 编译期可知的常量整型值，可用于 C++ 要求 “整型常量表达式” 的核心语境：数组尺寸、整型模板实参（如std::array的长度）、枚举量的值、对齐修饰符（alignas）等。普通const对象无法满足这些场景（仅保证只读，不保证编译期初始化），因此： 所有constexpr对象都是const对象，但并非所有const对象都是constexpr对象。 cons...</div></div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span><a class="page-number" href="/page/2/#content-inner">2</a><span class="space">…</span><a class="page-number" href="/page/8/#content-inner">8</a><a class="extend next" rel="next" href="/page/2/#content-inner"><i class="fas fa-chevron-right 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<li class="card-category-list-item "><a class="card-category-list-link" href="/categories/C/"><span class="card-category-list-name">C++</span><span class="card-category-list-count">30</span></a></li><li class="card-category-list-item "><a class="card-category-list-link" href="/categories/Effective-Modern-C/"><span class="card-category-list-name">Effective Modern C++</span><span class="card-category-list-count">42</span></a></li><li class="card-category-list-item "><a class="card-category-list-link" href="/categories/%E8%AF%97%E8%AF%8D%E6%AD%8C%E8%B5%8B/"><span class="card-category-list-name">诗词歌赋</span><span class="card-category-list-count">2</span></a></li>
</ul></div><div class="card-widget card-tags"><div class="item-headline"><i class="fas fa-tags"></i><span>标签</span></div><div class="card-tag-cloud"><a href="/tags/atomic/" style="font-size: 1.1em; color: #999">atomic</a> <a href="/tags/%E8%AF%97%E8%AF%8D%E6%AD%8C%E8%B5%8B/" style="font-size: 1.1em; color: #999">诗词歌赋</a> <a href="/tags/make-unique/" style="font-size: 1.1em; color: #999">make_unique</a> <a href="/tags/%E8%BF%90%E7%AE%97%E7%AC%A6%E9%87%8D%E8%BD%BD/" style="font-size: 1.1em; color: #999">运算符重载</a> <a href="/tags/%E7%BD%91%E7%BB%9C/" style="font-size: 1.37em; color: #99a4b2">网络</a> <a href="/tags/%E5%AF%B9%E8%B1%A1/" style="font-size: 1.1em; color: #999">对象</a> <a href="/tags/%E7%BB%A7%E6%89%BF/" style="font-size: 1.1em; color: #999">继承</a> <a href="/tags/auto/" style="font-size: 1.37em; color: #99a4b2">auto</a> <a href="/tags/%E6%A8%A1%E6%9D%BF%E7%B1%BB%E5%9E%8B%E6%8E%A8%E5%AF%BC/" style="font-size: 1.1em; color: #999">模板类型推导</a> <a href="/tags/%E9%97%AE%E9%A2%98/" style="font-size: 1.1em; color: #999">问题</a> <a href="/tags/decltype/" style="font-size: 1.23em; color: #999ea6">decltype</a> <a href="/tags/%E4%BA%8C%E8%BF%9B%E5%88%B6/" style="font-size: 1.1em; color: #999">二进制</a> <a href="/tags/%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B/" style="font-size: 1.1em; color: #999">数据类型</a> <a href="/tags/%E7%BA%BF%E7%A8%8B/" style="font-size: 1.23em; color: #999ea6">线程</a> <a href="/tags/%E5%BC%95%E7%94%A8/" style="font-size: 1.1em; color: #999">引用</a> <a href="/tags/C/" style="font-size: 1.5em; color: #99a9bf">C++</a> <a href="/tags/%E6%BB%95%E7%8E%8B%E9%98%81%E5%BA%8F/" style="font-size: 1.1em; color: #999">滕王阁序</a> <a href="/tags/%E5%88%9D%E5%A7%8B%E5%8C%96/" style="font-size: 1.1em; color: #999">初始化</a> <a href="/tags/%E5%88%AB%E5%90%8D%E5%A3%B0%E6%98%8E/" style="font-size: 1.1em; color: #999">别名声明</a> <a href="/tags/%E5%86%85%E5%AD%98%E5%88%86%E5%8C%BA/" style="font-size: 1.1em; color: #999">内存分区</a> <a href="/tags/%E6%8C%87%E9%92%88/" style="font-size: 1.1em; color: #999">指针</a> <a href="/tags/%E5%87%BD%E6%95%B0%E5%BC%8F%E7%BC%96%E7%A8%8B/" style="font-size: 1.1em; color: #999">函数式编程</a> <a href="/tags/future/" style="font-size: 1.1em; color: #999">future</a> <a href="/tags/%E5%9F%BA%E7%A1%80/" style="font-size: 1.23em; color: #999ea6">基础</a> <a href="/tags/%E5%BC%82%E6%AD%A5/" style="font-size: 1.1em; color: #999">异步</a> <a href="/tags/%E4%BB%BB%E5%8A%A1/" style="font-size: 1.1em; color: #999">任务</a> <a href="/tags/shared-ptr/" style="font-size: 1.1em; color: #999">shared_ptr</a> <a href="/tags/%E6%8A%92%E6%83%85/" style="font-size: 1.1em; color: #999">抒情</a> <a href="/tags/%E5%8F%8B%E5%85%83/" style="font-size: 1.1em; color: #999">友元</a> <a href="/tags/IO%E6%A8%A1%E5%9E%8B/" style="font-size: 1.1em; color: #999">IO模型</a> <a href="/tags/%E9%A2%84%E5%A4%84%E7%90%86/" style="font-size: 1.1em; color: #999">预处理</a> <a href="/tags/Pimpl/" style="font-size: 1.1em; color: #999">Pimpl</a> <a href="/tags/%E5%87%BD%E6%95%B0/" style="font-size: 1.1em; color: #999">函数</a> <a href="/tags/%E6%96%87%E6%9C%AC%E5%A4%84%E7%90%86/" style="font-size: 1.1em; color: #999">文本处理</a> <a href="/tags/%E7%A7%BB%E5%8A%A8%E6%93%8D%E4%BD%9C/" style="font-size: 1.1em; color: #999">移动操作</a> <a href="/tags/RAII/" style="font-size: 1.1em; color: #999">RAII</a> <a href="/tags/STL/" style="font-size: 1.1em; color: #999">STL</a> <a href="/tags/thread/" style="font-size: 1.23em; color: #999ea6">thread</a> <a href="/tags/%E9%80%9A%E7%94%A8%E5%BC%95%E7%94%A8/" style="font-size: 1.23em; color: #999ea6">通用引用</a> <a href="/tags/%E6%96%87%E4%BB%B6IO/" style="font-size: 1.37em; color: #99a4b2">文件IO</a></div></div><div class="card-widget card-archives">
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<a class="card-archive-list-link" href="/archives/2026/03/">
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三月 2026
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<a class="card-archive-list-link" href="/archives/2025/11/">
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十一月 2025
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<a class="card-archive-list-link" href="/archives/2025/10/">
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十月 2025
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