对象问题 [英] object question

问题描述

创建空类对象时分配了多少内存？


谢谢。


杰克

解决方案

创建空类对象时分配了多少内存？


试试这个......


舱空

{

};


空e;


cout<<" \ nSizeof"<< typeid（e）.name（）<<" ="<< sizeof（空）;


使用MSVC 8.0时输出为1

junw2 ... @ gmail.com写道：

创建空类对象时分配了多少内存？ />

谢谢。

我想象这是获得一个类的b / b
类/实例大小的好方法 -


class DoNothing

{

public：

DoNothing（）{}

// int a;

};


int main（）

{

DoNothing donothing ;

std :: cout<< sizeof（donothing）<< std :: endl;

std :: cout<< sizeof（DoNothing）<< std :: endl;

}

* ju ****** @ gmail.com ：

创建空类对象时分配了多少内存？

取决于编译器和上下文。


作为基类对象，它可以占用零字节，否则更多。


-

答：因为它弄乱了人们通常阅读文字的顺序。

问：为什么会这样这么糟糕吗？

A：热门帖子。

问：usenet和电子邮件中最烦人的是什么？

how much memory is allocated when creating an object of an empty class?

Thanks.

Jack

解决方案

how much memory is allocated when creating an object of an empty class?

Try this...

class Empty
{
} ;

Empty e ;

cout<<"\nSizeof "<<typeid(e).name()<<" = "<<sizeof(Empty) ;

Output is 1 when using MSVC 8.0

[e-mail] wrote:

how much memory is allocated when creating an object of an empty class?

Thanks.

I imaging that this would be a good way of getting the size of a
class/instance of a class -

class DoNothing
{
public:
DoNothing() {}
//int a;
};

int main()
{
DoNothing donothing;
std::cout << sizeof( donothing ) << std::endl;
std::cout << sizeof( DoNothing ) << std::endl;
}

* ju******@gmail.com:

how much memory is allocated when creating an object of an empty class?

Depends on the compiler and the context.

As a base class object it can occupy zero bytes, otherwise more.

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

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