Solved

want the offset address of a variable

Posted on 2004-09-28
9
183 Views
Last Modified: 2010-04-01
Im new to c++ and I want a function that returns the offset address of a variable.........Im using the API functions.
0
Comment
Question by:ewak
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
9 Comments
 
LVL 17

Accepted Solution

by:
rstaveley earned 125 total points
ID: 12168112
Use the & operator.

e.g.

  int i = 123;
  cout << "Address of i is " << &i << '\n';
0
 
LVL 30

Assisted Solution

by:Axter
Axter earned 125 total points
ID: 12168259
To add to above comment:

int * GetOffSet(int& src){
     return &src;
}
0
 
LVL 22

Assisted Solution

by:grg99
grg99 earned 125 total points
ID: 12168526
Could you explain what you mean by the "offset" address?

"Offset" is usually a concept related to the old 16-bit segment model.  

Most of us nowadays use the 32-bit flat model.

One rarely needs the "offset" in this more enlightened era.

Pls explain.

0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 86

Assisted Solution

by:jkr
jkr earned 125 total points
ID: 12169657
Are you thinking about 'offsetof()'?

#define offsetof(s,m)   (size_t)&(((s *)0)->m)

E.g.

struct tm {
        int tm_sec;     /* seconds after the minute - [0,59] */
        int tm_min;     /* minutes after the hour - [0,59] */
        int tm_hour;    /* hours since midnight - [0,23] */
        int tm_mday;    /* day of the month - [1,31] */
        int tm_mon;     /* months since January - [0,11] */
        int tm_year;    /* years since 1900 */
        int tm_wday;    /* days since Sunday - [0,6] */
        int tm_yday;    /* days since January 1 - [0,365] */
        int tm_isdst;   /* daylight savings time flag */
        };

struct tm mytm;

printf ( "Address offset of 'tm_mon' in 'struct tm' is %d\n", offsetof ( &mytm, tm_day));
0
 
LVL 30

Expert Comment

by:Axter
ID: 12661379
>>Any objections should be posted here in the next 4 days. After that time, the question will be closed.

I recommend splitting the points to all four experts {rstaveley, Axter,  grg99, & jkr}

All four experts help give a full answer.
0
 
LVL 17

Expert Comment

by:rstaveley
ID: 12662452
Agreed wih Axter
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: SunnyDark
This article's goal is to present you with an easy to use XML wrapper for C++ and also present some interesting techniques that you might use with MS C++. The reason I built this class is to ease the pain of using XML files with C++, since there is…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

622 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question