473,396 Members | 1,933 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,396 software developers and data experts.

Pointer from Reference ???

1
I have a pure virtual base class B, and derived from it class D.

One of my functions takes a reference to the class D as an argument:
double func(const D& ref);
and needs to instantiate an object X using constructor in the form:
X(const B* ptr);

How do I convert ref to ptr in this case?
Nov 27 '06 #1
1 1509
horace1
1,510 Expert 1GB
I have a pure virtual base class B, and derived from it class D.

One of my functions takes a reference to the class D as an argument:
double func(const D& ref);
and needs to instantiate an object X using constructor in the form:
X(const B* ptr);

How do I convert ref to ptr in this case?
you can use the address of opertor, e.g.
Expand|Select|Wrap|Line Numbers
  1. const D *ptr= &ref;
  2.  
Nov 27 '06 #2

Sign in to post your reply or Sign up for a free account.

Similar topics

110
by: Mr A | last post by:
Hi! I've been thinking about passing parameteras using references instead of pointers in order to emphasize that the parameter must be an object. Exemple: void func(Objec& object); //object...
9
by: Sandy | last post by:
Hi, In one of my interview I was asked a question, whether using pointers for argument is efficient then reference or not. i.e. void fun(Complex *p) void fun(Complex &ref) can somebody...
18
by: man | last post by:
can any one please tell me what is the diff between pointer and reference.....and which one is better to use ....and why???????
12
by: Mike | last post by:
Consider the following code: """ struct person { char *name; int age; }; typedef struct person* StructType;
13
by: al.cpwn | last post by:
I get that these two are different int* get() { static int m; return &m; } int& get() {
51
by: Kuku | last post by:
What is the difference between a reference and a pointer?
8
by: toton | last post by:
HI, One more small doubt from today's mail. I have certain function which returns a pointer (sometimes a const pointer from a const member function). And certain member function needs reference...
33
by: Ney André de Mello Zunino | last post by:
Hello. I have written a simple reference-counting smart pointer class template called RefCountPtr<T>. It works in conjunction with another class, ReferenceCountable, which is responsible for the...
2
weaknessforcats
by: weaknessforcats | last post by:
Handle Classes Handle classes, also called Envelope or Cheshire Cat classes, are part of the Bridge design pattern. The objective of the Bridge pattern is to separate the abstraction from the...
41
by: Summercool | last post by:
Can we confirm the following? also someone said, Java also has "reference" like in C++, which is an "implicit pointer": Pointer and Reference --------------------- I am starting to see what...
0
by: Charles Arthur | last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
1
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
1
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
0
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
0
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers,...
0
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...
0
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.