blocks|key|677439|text|值得引用这里的标准|type|unstyled|depth|inlineStyleRanges|entityRanges|data|677440|9.4.1静态成员函数|677441|2)注意:静态成员函数没有此指针(9.3.2)。-end注：static成员函数不应是virtual。不应存在具有相同名称和相同参数类型(13.1)的static和非static成员函数。
静态成员函数不应声明为const__、volatile__或const+volatile。
|blockquote|offset|length|style|CODE|677442|677443|static函数没有this参数。他们不需要cv-限定符。|677444|见this+McNellis的答复|677445|当将const限定符应用于非静态成员函数时，它会影响this指针。对于类C的const限定成员函数，this指针为C+const*类型，而对于不限定的成员函数，this指针为C*类型。|677446|677447|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/7035356/c-why-static-member-function-cant-be-created-with-const-qualifier?answertab=active#tab-top^0|0|0|U|6|17|7|23|6|2B|6|2Y|5|36|8|3H|E|0|0|0|6|A|4|0|1|4|0|0|2|5|Q|4|10|1|1E|4|1L|8|28|4|2F|2|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@$G|13|H|14|I|J]|$G|15|H|16|I|J]|$G|17|H|18|I|J]|$G|19|H|1A|I|J]|$G|1B|H|1C|I|J]|$G|1D|H|1E|I|J]|$G|1F|H|1G|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1I|8|@$G|1J|H|1K|I|J]|$G|1L|H|1M|I|J]]|9|@]|A|$]]|$1|N|3|O|5|6|7|1N|8|@]|9|@$G|1O|H|1P|1|1Q]]|A|$]]|$1|P|3|Q|5|F|7|1R|8|@$G|1S|H|1T|I|J]|$G|1U|H|1V|I|J]|$G|1W|H|1X|I|J]|$G|1Y|H|1Z|I|J]|$G|20|H|21|I|J]|$G|22|H|23|I|J]|$G|24|H|25|I|J]]|9|@]|A|$]]|$1|R|3|-4|5|6|7|26|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|27|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

Worth quoting the standard here

9.4.1 Static member functions

<blockquote>
 2) [ Note: A static member function does not have a this pointer (9.3.2). —end note ] A <code>static</code> member
 function shall not be <code>virtual</code>. There shall not be a <code>static</code> and a non-<code>static</code> member function with the
 same name and the same parameter types (13.1). 
 
 A static member function shall not be declared <code>const</code>,
 <code>volatile</code>, or <code>const volatile</code>. 
</blockquote>

<code>static</code> functions have no <code>this</code> parameter. They need no cv-qualifiers.

See <a href="https://stackoverflow.com/questions/7035356/c-why-static-member-function-cant-be-created-with-const-qualifier?answertab=active#tab-top">this</a> answer by James McNellis

<blockquote>
 When you apply the <code>const</code> qualifier to a nonstatic member function,
 it affects the <code>this</code> pointer. For a const-qualified member function
 of class <code>C</code>, the <code>this</code> pointer is of type <code>C const*</code>, whereas for a
 member function that is not const-qualified, the <code>this</code> pointer is of
 type <code>C*</code>.
</blockquote>

blocks|key|642760|text|static成员函数不绑定到其类的实例，因此它是const和/或volatile+(即“cv限定”)是没有意义的，因为在调用该函数时没有const或volatile可应用到的实例。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|642761|entityMap^0|0|6|O|5|W|8|1W|5|22|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|G|$]]

A <code>static</code> member function is not bound to an instance of its class, so it does not make sense for it to be <code>const</code> and/or <code>volatile</code> (i.e. "cv-qualified"), because there is no instance to which <code>const</code> or <code>volatile</code> can be applied to in calling that function.

blocks|key|677469|text|在那里编写const是没有意义的，因为函数是static，因此没有类实例来注入const上下文。因此，它被视为一个错误。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|677470|entityMap^0|5|5|M|6|13|5|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

It doesn't make sense to write <code>const</code> there, because the function is <code>static</code> and therefore there is no class instance on which to imbue a <code>const</code> context. Thus it is treated as an error.

blocks|key|642838|text|成员函数声明中的限定符const应用于指向该类对象的指针。由于静态函数不绑定到类的对象，因此它们没有隐式参数。因此，限定符const对这些函数没有任何意义。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|642839|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Qualifier const in a member function declaration is applied to the pointer to the object of class this. As static functions are not bound to objects of the class they have no implicit parameter this. So the qualifier const has no any sense for these functions.

blocks|key|337704|text|成员函数的Const限定符意味着该函数不会更改对象实例，可以对const对象进行调用。静态成员函数不绑定到任何对象实例，因此它们成为const是没有意义的，因为您不对任何对象调用静态成员函数。这就是为什么标准禁止这样做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|337705|class+Foo
{
public:
++++void+memberFunc();
++++static+void+staticMemberFunc();
}

Foo+f;
f.memberFunc();++++++++++//+called+on+an+object+instance
Foo::staticMemberFunc();+//+not+called+on+an+object+instance|code-block|syntax|javascript|337706|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Const qualifier for member functions means that the function will not change the object instance and can be called on const objects. Static member functions are not bound to any object instance and therefore it makes no sense for them to be const, since you don't call the static member function on any object. That is why the standard forbids it.

<pre><code>class Foo
{
public:
 void memberFunc();
 static void staticMemberFunc();
}

Foo f;
f.memberFunc(); // called on an object instance
Foo::staticMemberFunc(); // not called on an object instance
</code></pre>

This is the error:

<pre><code>error: static member function ‘static void myClass::myfunct()’ cannot have cv-qualifier
</code></pre>

Can someone please explain this error and why const cannot be used.

<pre><code>#include&lt;iostream&gt;
class myClass{ 
 static void myfunct() const 
 { 
 //do something
 }
};

int main()
{
 //some code
 return 0;
}
</code></pre>

Why can't a static member function have a cv-qualifier?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋 

腾讯云代码助手

CODING DevOps

Cloud Studio

SDK中心

API中心

命令行工具

这是一个错误：error: static member function ‘static void myClass::myfunct()’ cannot have cv-qualifier请有人解释一下这个错误，以及为什么不能使用const。#include<iostream>class myClass{ static void myfunct() const {

问为什么静态成员函数不能有cv-限定符？
EN

回答 5

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问为什么静态成员函数不能有cv-限定符？EN

回答 5

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问为什么静态成员函数不能有cv-限定符？
EN