https://renderdoc.space/assets/js/3-Singleton.html.d35d5cd0.js

1"use strict";(self.webpackChunkrenderdoc=self.webpackChunkrenderdoc||[]).push([[6139],{15834:(n,s,a)=>{a.r(s),a.d(s,{comp:()=>q,data:()=>z});var e=a(20641);const t=a.p+"assets/img/sington.8c3aa75c.jpg",o=a.p+"assets/img/singletonc++.9aa16811.png",l=a.p+"assets/img/setsing.5189c2cf.png",c=a.p+"assets/img/setsingclass.3ccf416e.png",p=a.p+"assets/img/nullptr.2c816875.jpg",i=a.p+"assets/img/cdosingleton.f56c4b40.png",k=a.p+"assets/img/gameinstanceprint.4156de95.png",u=(0,e.Fv)('<div class="language-cpp line-numbers-mode" data-ext="cpp" data-title="cpp"><pre class="language-cpp"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;iostream&gt;</span></span>\n<span class="token keyword">class</span> <span class="token class-name">MyClass</span> <span class="token punctuation">{</span>  \n<span class="token punctuation">}</span>\n<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>\n    MyClass<span class="token operator">*</span> a <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token function">MyClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>\n    <span class="token comment">//Do Someting</span>\n    <span class="token keyword">delete</span> a<span class="token punctuation">;</span>\n<span class="token punctuation">}</span>\n</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div>',1),r=(0,e.Fv)('<ol><li><strong>默认构造函数 (Default Constructor):</strong></li></ol><blockquote><p>如果没有为类定义任何构造函数，编译器将生成一个无参的默认构造函数。</p></blockquote><ol start="2"><li><strong>析构函数 (Destructor):</strong></li></ol><blockquote><p>如果没有显式定义析构函数，编译器将生成一个默认的析构函数。用于在对象生命周期结束时进行清理工作,如 <code>~MyClass()</code>。</p></blockquote><ol start="3"><li><strong>拷贝构造函数 (Copy Constructor):</strong></li></ol><blockquote><p>如果没有定义自己的拷贝构造函数，编译器将生成一个默认的拷贝构造函数。 通过复制另一个对象来初始化一个新对象，如 <code>MyClass obj1; MyClass obj2 = obj1;</code>。</p></blockquote><ol start="4"><li><strong>拷贝赋值运算符 (Copy Assignment Operator):</strong></li></ol><blockquote><p>如果没有定义自己的拷贝赋值运算符，编译器将生成一个默认的拷贝赋值运算符。 用于将一个对象的值复制给另一个对象，例如 <code>MyClass obj1, obj2; obj2 = obj1;</code>。</p></blockquote><div class="language-cpp line-numbers-mode" data-ext="cpp" data-title="cpp"><pre class="language-cpp"><code><span class="token keyword">class</span> <span class="token class-name">MyClass</span>\n<span class="token punctuation">{</span>\n<span class="token keyword">public</span><span class="token operator">:</span>\n    <span class="token function">MyClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n    <span class="token operator">~</span><span class="token function">MyClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n<span class="token punctuation">}</span><span class="token punctuation">;</span>\n</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div>',9),d=(0,e.Fv)('<blockquote><p>类默认是私有的。</p></blockquote><div class="language-cpp line-numbers-mode" data-ext="cpp" data-title="cpp"><pre class="language-cpp"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;iostream&gt;</span></span>\n\n<span class="token keyword">class</span> <span class="token class-name">MyClass</span>\n<span class="token punctuation">{</span>\n    <span class="token function">MyClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n<span class="token keyword">public</span><span class="token operator">:</span>\n    <span class="token operator">

1~</span><span class="token function">MyClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n<span class="token punctuation">}</span><span class="token punctuation">;</span>\n\n<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>\n    \n    MyClass<span class="token operator">*</span> a <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token function">MyClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>\n\n    <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>\n<span class="token punctuation">}</span>\n</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div>',2),v=(0,e.Lk)("figure",null,[(0,e.Lk)("img",{src:t,alt:"",tabindex:"0",loading:"lazy"}),(0,e.Lk)("figcaption")],-1),m=(0,e.Fv)('<div class="language-cpp line-numbers-mode" data-ext="cpp" data-title="cpp"><pre class="language-cpp"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;iostream&gt;</span></span>\n\n<span class="token keyword">class</span> <span class="token class-name">Singleton</span> \n<span class="token punctuation">{</span>\n\n    <span class="token comment">// 将构造函数私有化</span>\n    <span class="token function">Singleton</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n\n<span class="token keyword">public</span><span class="token operator">:</span>\n<span class="token comment">// 静态成员函数，用于获取类的唯一实例</span>\n<span class="token keyword">static</span> Singleton<span class="token operator">&amp;</span> <span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span> \n<span class="token punctuation">{</span>\n<span class="token keyword">static</span> Singleton instance<span class="token punctuation">;</span>\n<span class="token keyword">return</span> instance <span class="token punctuation">;</span>\n<span class="token punctuation">}</span>\n<span class="token keyword">void</span> <span class="token function">testfunction</span><span class="token punctuation">(</span><span class="token punctuation">)</span> \n<span class="token punctuation">{</span>\nstd<span class="token double-colon punctuation">::</span>cout<span class="token operator">&lt;&lt;</span><span class="token string">&quot;testfunction&quot;</span><span class="token operator">&lt;&lt;</span>std<span class="token double-colon punctuation">::</span>endl<span class="token punctuation">;</span>\n<span class="token punctuation">}</span>\n<span class="token punctuation">}</span><span class="token punctuation">;</span>\n\n<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> \n<span class="token punctuation">{</span>\n    <span class="token comment">// 获取单例实例</span>\n    Singleton<span class="token operator">&amp;</span> singletonInstance <span class="token operator">=</span> <span class="token class-name">Singleton</span><span class="token double-colon punctuation">::</span><span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>\n    singletonInstance<span class="token punctuation">.</span><span class="token function">testfunction</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>\n    <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>\n<span class="token punctuation">}</span>\n</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div>',1),L=(0,e.Fv)('<div class="language-cpp line-numbers-mode" data-ext="cpp" data-title="cpp"><pre class="language-cpp"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;iostream&gt;</span></span>\n\n<span class="token keyword">class</span> <span class="token class-name">Singleton</span> \n<span class="token punctuation">{</span>\n    <span class="token comment">// 将构造函数私有化</span>\n    <span class="token function">Singleton</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n\n<span class="token keyword">public</span><span class="token operator">:</span>\n    <span class="token keyword">static</span> Singleton<span class="token operator">*</span> <span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>

1\n        <span class="token keyword">static</span> Singleton instance<span class="token punctuation">;</span>\n        <span class="token keyword">return</span> <span class="token operator">&amp;</span>instance<span class="token punctuation">;</span>\n    <span class="token punctuation">}</span>\n    <span class="token keyword">void</span> <span class="token function">testfunction</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>\n        std<span class="token double-colon punctuation">::</span>cout<span class="token operator">&lt;&lt;</span><span class="token string">&quot;testfunction&quot;</span><span class="token operator">&lt;&lt;</span>std<span class="token double-colon punctuation">::</span>endl<span class="token punctuation">;</span>\n    <span class="token punctuation">}</span>\n<span class="token punctuation">}</span><span class="token punctuation">;</span>\n\n<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>   \n    <span class="token comment">// 获取单例实例</span>\n    Singleton<span class="token operator">*</span> singletonInstance <span class="token operator">=</span> <span class="token class-name">Singleton</span><span class="token double-colon punctuation">::</span><span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>\n    singletonInstance<span class="token operator">-&gt;</span><span class="token function">testfunction</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>\n    <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>\n<span class="token punctuation">}</span>\n</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><blockquote><p>也可以改写成动态内存分配创建单例对象（懒汉式）,这也是智能指针管理内存的核心思想之一，用户无需关心指针释放时机。</p></blockquote><div class="language-cpp line-numbers-mode" data-ext="cpp" data-title="cpp"><pre class="language-cpp"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;iostream&gt;</span></span>\n\n<span class="token keyword">class</span> <span class="token class-name">Singleton</span> \n<span class="token punctuation">{</span>\n    <span class="token comment">// 将构造函数私有化</span>\n    <span class="token function">Singleton</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n\n<span class="token keyword">public</span><span class="token operator">:</span>\n    <span class="token keyword">static</span> Singleton<span class="token operator">*</span> <span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>\n        <span class="token keyword">static</span> Singleton<span class="token operator">*</span> instance <span class="token operator">=</span> <span class="token keyword">nullptr</span><span class="token punctuation">;</span>

1\n        <span class="token keyword">if</span> <span class="token punctuation">(</span>instance <span class="token operator">==</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>\n            instance <span class="token operator">=</span> <span class="token keyword">new</span> Singleton<span class="token punctuation">;</span>\n        <span class="token punctuation">}</span>\n        <span class="token keyword">return</span> instance<span class="token punctuation">;</span>\n    <span class="token punctuation">}</span>\n\n    <span class="token keyword">void</span> <span class="token function">testfunction</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>\n        std<span class="token double-colon punctuation">::</span>cout <span class="token operator">&lt;&lt;</span> <span class="token string">&quot;testfunction&quot;</span> <span class="token operator">&lt;&lt;</span> std<span class="token double-colon punctuation">::</span>endl<span class="token punctuation">;</span>\n    <span class="token punctuation">}</span>\n\n    <span class="token operator">~</span><span class="token function">Singleton</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>\n        <span class="token comment">// 在析构函数中释放动态分配的内存</span>\n        <span class="token keyword">if</span> <span class="token punctuation">(</span>instance <span class="token operator">!=</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>\n            <span class="token keyword">delete</span> instance<span class="token punctuation">;</span>\n            instance <span class="token operator">=</span> <span class="token keyword">nullptr</span><span class="token punctuation">;</span>\n        <span class="token punctuation">}</span>\n    <span class="token punctuation">}</span>\n<span class="token punctuation">}</span><span class="token punctuation">;</span>\n\n<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>   \n    <span class="token comment">// 获取单例实例</span>\n    Singleton<span class="token operator">*</span> singletonInstance <span class="token operator">=</span> <span class="token class-name">Singleton</span><span class="token double-colon punctuation">::</span><span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>\n    singletonInstance<span class="token operator">-&gt;</span><span class="token function">testfunction</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>\n\n    <span class="token comment">// 在程序结束时，析构函数会被调用，释放动态分配的内存</span>\n\n    <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>\n<span class="token punctuation">}</span>\n</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><div class="hint-container note"><p class="hint-container-title">注</p><p>考虑UE大多数情况下无需多线程使用单例，因此没有考虑线程安全问题。懒汉式天生线程安全，但饿汉式多线程会存在线程安全问题，必要时考虑使用互斥锁、双重检查。</p></div>',4),b=(0,e.Lk)("figure",null,[(0,e.Lk)("img",{src:o,alt:"",tabindex:"0",loading:"lazy"}),(0,e.Lk)("figcaption")],-1),g=(0,e.Lk)("blockquote",null,[(0,e.Lk)("p",null,"在UE中宁可推荐使用结构体单例也不推荐直接用原生单例")],-1),W=(0,e.Lk)("h3",{id:"经典模式",tabindex:"-1"},[(0,e.Lk)("a",{class:"header-anchor",href:"#经典模式"},[(0,e.Lk)("span",null,"经典模式")])],-1),y=(0,e.Lk)("div",{class:"language-cpp line-numbers-mode","data-ext":"cpp","data-title":"cpp"},[(0,e.Lk)("pre",{class:"language-cpp"},[(0,e.Lk)("code",null,[(0,e.Lk)("span",{class:"token macro property"},[(0,e.Lk)("span",{class:"token directive-hash"},"#"),(0,e.Lk)("span",{class:"token directive keyword"},"pragma"),(0,e.eW)(),(0,e.Lk)("span",{class:"token expression"},"once")]),(0,e.eW)("\n\n"),(0,e.Lk)("span",{class:"token macro property"},[(0,e.Lk)("span",{class:"token directive-hash"},"#"),(0,e.Lk)("span",{class:"token directive 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operator">=</span> <span class="token generic-function"><span class="token function">Cast</span><span class="token generic class-name"><span class="token operator">&lt;</span>UGameSingleton<span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>GEngine<span class="token operator">-&gt;</span>GameSingleton<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//没有设置拿不到对应对象实例指针。</span>\n</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><figure><img src="'+p+'" alt="" tabindex="0" loading="lazy"><figcaption></figcaption></figure><h3 id="cdosingleton" tabindex="-1"><a class="header-anchor" href="#cdosingleton"><span>CDOSingleton</span></a></h3>',3),G=(0,e.Lk)("figure",null,[(0,e.Lk)("img",{src:i,alt:"",tabindex:"0",loading:"lazy"}),(0,e.Lk)("figcaption")],-1),U=(0,e.Lk)("div",{class:"language-cpp 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1false</span><span class="token punctuation">;</span>\n<span class="token punctuation">}</span>\n</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="问题" tabindex="-1"><a class="header-anchor" href="#问题"><span>问题</span></a></h3>',2),O=(0,e.Lk)("h3",{id:"扩展",tabindex:"-1"},[(0,e.Lk)("a",{class:"header-anchor",href:"#扩展"},[(0,e.Lk)("span",null,"扩展")])],-1),A={href:"https://forums.unrealengine.com/t/singleton-pattern-in-c/430452",target:"_blank",rel:"noopener noreferrer"},T={href:"https://www.bilibili.com/video/BV1bR4y177Hp/?spm_id_from=333.999.0.0",target:"_blank",rel:"noopener noreferrer"},D={},q=(0,a(66262).A)(D,[["render",function(n,s){const a=(0,e.g2)("chatmessage"),t=(0,e.g2)("RouteLink"),o=(0,e.g2)("CodeTabs"),l=(0,e.g2)("gifwithbutton"),c=(0,e.g2)("ExternalLinkIcon");return(0,e.uX)(),(0,e.CE)("div",null,[(0,e.bF)(a,{avatar:"../../assets/emoji/hh.png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 什么是单例? ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/bqb (1).png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 不同的框架实现方法不同，在C++中单例一般是指确保一个类只有一个实例，并为其提供一个全局访问入口。 ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 你先回答我，定义一个类后你是通过什么办法来新建实例的？ ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/hx.png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 用new关键字，堆上开辟一块空间给该对象实例。 ")])),_:1}),u,(0,e.bF)(a,{avatar:"../../assets/emoji/bqb (5).png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 可是，该怎么限制用户的new操作呢？我总不能和用户说你不能new一个新实例吧！ ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 你可以先康康一个普通类初始化后默认会有哪些操作？ ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/ybk.png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 这还不简单，类的四个初始化操作。 ")])),_:1}),r,(0,e.bF)(a,{avatar:"../../assets/emoji/new2.png",avatarWidth:50,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 我们都知道构造函数默认写在public中，如果我强制将他移动到private会发生什么？ ")])),_:1}),d,(0,e.bF)(a,{avatar:"../../assets/emoji/hx.png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 还能发生什么，编译器报错呗。 ")])),_:1}),v,(0,e.bF)(a,{avatar:"../../assets/emoji/bqb (2).png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 但换个角度思考，我们已经成功限制了用户的new行为，问题也变成了怎么生成第一个实例！ 现在你思考一下什么情况下不需要新建实例就能访问某个对象成员？ ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/new3.png",avatarWidth:55},{default:(0,e.k6)((()=>[(0,e.eW)(" 我记得static关键字修饰的成员函数！不需要实例化对象。 ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/new2.png",avatarWidth:55,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 是的，现在new这条路已经不能走了，咱可以用static将他的提到静态区。 ")])),_:1}),m,(0,e.bF)(a,{avatar:"../../assets/emoji/new3.png",avatarWidth:55},{default:(0,e.k6)((()=>[(0,e.eW)(" 妙啊！也就是说利用static函数和他沟通，让他自己创造自己！ ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/bqb (2).png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 孺子可教！改成指针传递也是可以的 ")])),_:1}),L,(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.Lk)("p",null,[(0,e.bF)(t,{to:"/language/cpp/designer_%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F_/1-Sington.html"},{default:(0,e.k6)((()=>[(0,e.eW)("Language/c++Designer/Singleton|单例")])),_:1})])])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/hh.png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 那么！UE中支持原生C++单例实现吗？ ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 支持！但官方不推荐使用！官方推荐我们使用subsystem ")])),_:1}),b,g,W,(0,e.bF)(o,{id:"104",data:[{id:"GameSingleton.h"},{id:"GameSingleton.cpp"}],"tab-id":"language"},{title0:(0,e.k6)((({value:n,isActive:s})=>[(0,e.eW)("GameSingleton.h")])),title1:(0,e.k6)((({value:n,isActive:s})=>[(0,e.eW)("GameSingleton.cpp")])),tab0:(0,e.k6)((({value:n,isActive:s})=>[y])),tab1:(0,e.k6)((({value:n,isActive:s})=>[f])),_:1},8,["data"]),(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 蓝图中通过实例指针修改成员变量，然后跳转关卡或者重新打开打印一下康康不就知道了！` ")])),_:1}),h,(0,e.bF)(l,{src:"../../assets/unrealgif/ramdonsington.gif"}),(0,e.bF)(a,{avatar:"../../assets/emoji/hh.png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 我发现他重写打开关卡后他设置的值依然是上一次！只有在引擎彻底重启后数值才恢复成30。 ")])),_:1}),(0,e.bF)(l,{src:"../../assets/unrealgif/sington.gif"}),(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 没错，他的生命周期和引擎是一样的，意味着在编辑器模式中的GEngine没有销毁这个变量就一直å­

1˜åœ¨ã€‚因此你可以看到另外一种写法： ")])),_:1}),w,(0,e.bF)(o,{id:"125",data:[{id:"GameSingleton.h"},{id:"GameSingleton.cpp"}],"tab-id":"language"},{title0:(0,e.k6)((({value:n,isActive:s})=>[(0,e.eW)("GameSingleton.h")])),title1:(0,e.k6)((({value:n,isActive:s})=>[(0,e.eW)("GameSingleton.cpp")])),tab0:(0,e.k6)((({value:n,isActive:s})=>[S])),tab1:(0,e.k6)((({value:n,isActive:s})=>[C])),_:1},8,["data"]),(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 两者生命周期都等同于GEngine，所以编辑器中停止游戏并不会释放内存。 ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 后面这种写法需要在设置中`项目设置`指定一下单例类。 ")])),_:1}),F,(0,e.bF)(a,{avatar:"../../assets/emoji/hh.png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 如果不设置呢？ ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 没有设置引擎会崩溃，因为他依赖GEngine的GameSingleton指针。 ")])),_:1}),j,(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 当然，还可以利用CDO来创建。 ")])),_:1}),G,(0,e.bF)(o,{id:"151",data:[{id:"MySingleton.h"},{id:"MySingleton.cpp"}],"tab-id":"language"},{title0:(0,e.k6)((({value:n,isActive:s})=>[(0,e.eW)("MySingleton.h")])),title1:(0,e.k6)((({value:n,isActive:s})=>[(0,e.eW)("MySingleton.cpp")])),tab0:(0,e.k6)((({value:n,isActive:s})=>[U])),tab1:(0,e.k6)((({value:n,isActive:s})=>[_])),_:1},8,["data"]),M,(0,e.bF)(a,{avatar:"../../assets/emoji/hh.png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 好像和游戏实例差不多耶！ ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/blzt.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>

1[(0,e.eW)(" 确实，他的表现确实很像我们的游戏实例，但游戏实例的生命周期却没有EngineSingleton长。 关卡结束运行就会执行析构。 ")])),_:1}),(0,e.bF)(l,{src:"../../assets/unrealgif/gameinstancegif.gif"}),(0,e.bF)(a,{avatar:"../../assets/emoji/dsyj.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 使用了open+level重新打开了这个关卡。 ")])),_:1}),I,E,(0,e.bF)(a,{avatar:"../../assets/emoji/dsyj.png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 严格意义上来说子系统并不是单例，但他的成员函数接口保证了只实例化一个子类，其中使用了一些高级C++特性和技巧，比如 引用计数、多态、重写等。后续的子系统篇会有详细介绍。 ")])),_:1}),x,(0,e.bF)(a,{avatar:"../../assets/emoji/hh.png",avatarWidth:40},{default:(0,e.k6)((()=>[(0,e.eW)(" 蓝图函数库是单例吗？ ")])),_:1}),(0,e.bF)(a,{avatar:"../../assets/emoji/bqb (3).png",avatarWidth:40,alignLeft:""},{default:(0,e.k6)((()=>[(0,e.eW)(" 蓝图函数库（Blueprint Function Library）不是单例，蓝图函数库本质是静态函数库，这些函数可供蓝图（Blueprint）图表中的蓝图调用。 ")])),_:1}),O,(0,e.Lk)("p",null,[(0,e.Lk)("a",A,[(0,e.eW)("UE官方论坛"),(0,e.bF)(c)])]),(0,e.Lk)("p",null,[(0,e.Lk)("a",T,[(0,e.eW)("Cherno C++"),(0,e.bF)(c)])])])}]]),z=JSON.parse('{"path":"/unreal/core_%E6%A0%B8%E5%BF%83_/3-Singleton.html","title":"c3.Singleton|单例","lang":"zh-CN","frontmatter":{"title":"c3.Singleton|单例","order":300,"category":["u++"],"description":"默认构造函数 (Default Constructor): 如果没有为类定义任何构造函数，编译器将生成一个无参的默认构造函数。 析构函数 (Destructor): 如果没有显式定义析构函数，编译器将生成一个默认的析构函数。用于在对象生命周期结束时进行清理工作,如 ~MyClass()。 拷贝构造函数 (Copy Constructor): 如果没有定...","head":[["meta",{"property":"og:url","content":"https://rendertool.github.io/RenderDoc/unreal/core_%E6%A0%B8%E5%BF%83_/3-Singleton.html"}],["meta",{"property":"og:site_name","content":"RenderDoc"}],["meta",{"property":"og:title","content":"c3.Singleton|单例"}],["meta",{"property":"og:description","content":"默认构造函数 (Default Constructor): 如果没有为类定义任何构造函数，编译器将生成一个无参的默认构造函数。 析构函数 (Destructor): 如果没有显式定义析构函数，编译器将生成一个默认的析构函数。用于在对象生命周期结束时进行清理工作,如 ~MyClass()。 拷贝构造函数 (Copy Constructor): 如果没有定..."}],["meta",{"property":"og:type","content":"article"}],["meta",{"property":"og:locale","content":"zh-CN"}],["meta",{"property":"og:updated_time","content":"2024-02-17T00:40:22.000Z"}],["meta",{"property":"article:author","content":"Mr.Si"}],["meta",{"property":"article:modified_time","content":"2024-02-17T00:40:22.000Z"}],["script",{"type":"application/ld+json"},"{\\"@context\\":\\"https://schema.org\\",\\"@type\\":\\"Article\\",\\"headline\\":\\"c3.Singleton|单例\\",\\"image\\":[\\"\\"],\\"dateModified\\":\\"2024-02-17T00:40:22.000Z\\",\\"author\\":[{\\"@type\\":\\"Person\\",\\"name\\":\\"Mr.Si\\",\\"url\\":\\"https://rendertool.github.io/RenderDoc/\\"}]}"]]},"headers":[{"level":3,"title":"经典模式","slug":"经典模式","link":"#经典模式","children":[]},{"level":3,"title":"EngineSingleton","slug":"enginesingleton","link":"#enginesingleton","children":[]},{"level":3,"title":"CDOSingleton","slug":"cdosingleton","link":"#cdosingleton","children":[]},{"level":3,"title":"GameInstance","slug":"gameinstance","link":"#gameinstance","children":[]},{"level":3,"title":"Subsystem|子系统","slug":"subsystem-子系统","link":"#subsystem-子系统","children":[]},{"level":3,"title":"问题","slug":"问题","link":"#问题","children":[]},{"level":3,"title":"扩展","slug":"扩展","link":"#扩展","children":[]}],"git":{"createdTime":1704306851000,"updatedTime":1708130422000,"contributors":[{"name":"sigaohe","email":"[email protected]","commits":2}]},"readingTime":{"minutes":6.75,"words":2024},"filePathRelative":"unreal/core[核心]/3-Singleton.md","localizedDate":"2024å¹´1月3日","excerpt":"\\n\\n\\

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