无效指针 [英] void pointer

问题描述

什么是无效指针？

what is a void pointer?

推荐答案

" Niks" < NB ***** @ gmail.com>在消息中写道

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"Niks" <nb*****@gmail.com> wrote in message
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什么是void指针？

void * MyPointer;

void* MyPointer;

Niks写道：

什么是无效指针？

你的意思是指向无效的指针？


通用指针，普通地址。该类型从''malloc''

函数和''operator new''返回，并被''operator delete''

作为参数接受。通常，指向void的指针用于保存指向任何类型或未知类型的对象的指针。具有相同的对齐

要求和与''char *''相同的表示。除了

要求''void *''可以保存指向任何对象的指针，从指针到对象的指针转换为指向void的指针。

转换是隐含的，反之亦然可以使用''static_cast''。


V

You mean a pointer to void?

A generic pointer, a plain address. That type is returned from ''malloc''
function and from ''operator new'', and is accepted by ''operator delete''
as an argument. Usually a pointer to void is used to hold a pointer to
an object of any type or of an unknown type. Has the same alignment
requirements and the same representation as ''char*''. Along with the
requirement that ''void*'' can hold a pointer to any object comes the
standard conversion from a pointer to object to a pointer to void. That
conversion is implicit and the reverse can be done using ''static_cast''.

V

Victor Bazarov写道：

Victor Bazarov wrote:

Niks写道：

什么是无效指针？

一个通用指针，一个普通的地址。该类型从''malloc''
函数和''operator new''返回，并被''operator delete''
接受为参数。通常，指向void的指针用于保存指向任何类型或未知类型的对象的指针。具有相同的对齐要求和与''char *''相同的表示。随着''void *''的要求可以保存指向任何对象的指针，从指针到对象的标准转换到指向void的指针。那个
转换是隐含的，反过来可以使用''static_cast''来完成。

V

You mean a pointer to void?

A generic pointer, a plain address. That type is returned from ''malloc''
function and from ''operator new'', and is accepted by ''operator delete''
as an argument. Usually a pointer to void is used to hold a pointer to
an object of any type or of an unknown type. Has the same alignment
requirements and the same representation as ''char*''. Along with the
requirement that ''void*'' can hold a pointer to any object comes the
standard conversion from a pointer to object to a pointer to void. That
conversion is implicit and the reverse can be done using ''static_cast''.

V

它可以保持（是否足以容纳）指向成员函数的指针？

我知道指向成员函数的指针是具体的实现

，但我想知道标准是否说关于这一点。


谢谢，

Dan

Can it hold (is it big enough to hold) a pointer to a member function?
I know that the pointers to member functions are implementation
specific, but I was wondering if the standard says anything about this.

thanks,
Dan

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