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A problem of address

楼主scicos（）2001-11-15 17:54:07 在 C/C++ / C语言提问

If I definied a class named A, then:
A *p=new p;

how can I get the address of 'p'?

and can I use an other variation of integer or double type to save this address? 问题点数：20、回复次数：9Top

1 楼leizhengdeng（权为妞妞所用，利为妞妞所谋）回复于 2001-11-15 18:12:11 得分 0

A *p=new p;//wrong
A *p = new A;
the p itself is the address you request to get.
to save the address:
int addr;
addr = (int)p;Top

2 楼zdb1025（三皮）回复于 2001-11-15 18:42:37 得分 0

我觉得他问的是 'p' 的地址，而不是 'p' 所指的地址
应为：
int addr;
addr= &p;

Top

3 楼heimeng（）回复于 2001-11-15 18:52:14 得分 0

..Top

4 楼scicos（）回复于 2001-11-15 19:33:03 得分 0

Thank you!
And if I do like this:

int addr;
addr=(int)p;

How can I use addr to access the contain of 'p'?Top

5 楼leizhengdeng（权为妞妞所用，利为妞妞所谋）回复于 2001-11-15 19:54:22 得分 0

A *pp;
pp = (A *)address;
I can't guarantee this will work.Top

6 楼leizhengdeng（权为妞妞所用，利为妞妞所谋）回复于 2001-11-15 20:08:00 得分 20

It do work:

#include <stdio.h>

class A
{
private:
int m;
public:
A(int i);
~A();
void say(void);
};

A::A(int i)
{
m = i;
}

A::~A()
{
}

void A::say(void)
{
printf("m = %d\n", m);
}

void main()
{
A *p=new A(10);
int addr;
addr= (int)p;

A *pp;
pp = (A *)addr;
pp->say();
delete pp;
return;
}Top

7 楼gffly（最佳前锋）回复于 2001-11-15 20:20:55 得分 0

&pTop

8 楼scicos（）回复于 2001-11-15 20:21:46 得分 0

Thank you very muchTop

9 楼scicos（）回复于 2001-11-15 20:23:36 得分 0

Thank you! leizhengdeng(E-农民)　Top