The name of the prefix unary ampersand operator (&) used in C and C++ to get the address of its operand, i.e. a pointer value pointing to that operand. For example, if `a` is an object of some type `T`, then `&a` will be a pointer value of type `T*` pointing to `a`.
Questions tagged [address-operator]
48 questions
29
votes
1 answer
Specific use case of to_address
So apparently C++20 is getting std::to_address.
From the cppreference page its use case doesn't seem clear to me. We already have operator& and std::addressof, why do we need yet another function that gives us an address to its argument?
Hatted Rooster
- 35,759
- 6
- 62
- 122
24
votes
4 answers
Why would anyone want to overload the & (address-of) operator?
Possible Duplicate:
What legitimate reasons exist to overload the unary operator& ?
I just read this question, and I can't help but wonder:
Why would anyone possibly want to overload the & ("address-of") operator?
SomeClass* operator&() const {
…
Tony the Pony
- 40,327
- 71
- 187
- 281
15
votes
4 answers
Whats the difference between Reference and Pointer return types in C++
If I were to create a simple object in C++, what is the difference between returning an address of the member vs. returning a pointer. As far as I'm aware, C++ doesn't have automatic garbage collection so it wouldn't be keeping a reference count. So…
wfoster
- 781
- 10
- 23
7
votes
2 answers
How fix AddressOf requires a relaxed conversation to the delegate error
Sorry, this is a mix of C# and VB.Net
I have a C# class with with 2 delegates:
public delegate string GetSettingDelegate(string key);
public event GetSettingDelegate GetSettingEvent;
public delegate void SetSettingDelegate(string key, string…
Steve Chadbourne
- 6,873
- 3
- 54
- 82
7
votes
4 answers
Understanding pointers with a swap program in C
I am trying to better understand pointers and referencing in C, and my course provided the following program as an example.
#include
void swap(int* a, int* b);
int main(void)
{
int x = 1;
int y = 2;
swap(&x, &y);
…
Caleb Jay
- 2,159
- 3
- 32
- 66
7
votes
4 answers
Get the address of an Objective-c property (which is a C struct)
I have an Objective-C class which contains a C-style struct. I need to call a C function passing a pointer to this object member (a.k.a. property). For the life of me, I can't figure out how to get the address of this C struct. Using the…
jDawg
6
votes
4 answers
AddressOf alternative in C#
Could anyboby help me with the alternative solution in C# regarding AddressOf operator in VB6? AddressOf returns a long value. What way can I get the output in C#?
Wasif Osman
6
votes
4 answers
" addressof " VB6 to VB.NET
I´m having some problem to convert my VB6 project to VB.NET
I don't understand how this "AddressOf" function should be in VB.NET
My VB6 code:
Declare Function MP4_ClientStart Lib "hikclient.dll" _
(pClientinfo As CLIENT_VIDEOINFO, ByVal abab As…
johan
- 61
- 1
- 2
6
votes
10 answers
Can an address be assigned to a variable in C?
Is it possible to assign a variable the address you want, in the memory?
I tried to do so but I am getting an error as "Lvalue required as left operand of assignment".
int main() {
int i = 10;
&i = 7200;
printf("i=%d address=%u", i,…
poorvank
- 7,524
- 19
- 60
- 102
4
votes
6 answers
In C (also C++), how '&' operator works as both address operator and bitwise operator ? As operator overloading is not supported by C
The operator '&' can be used in both of following way int a; scanf("%d",&a);
and printf("%d",1&2).
But different behaviour (for first as address operator and second time as bit-wise operator).
I know operator overloading is not there in C. Then how…
Rishi
- 75
- 7
4
votes
2 answers
Declaring int array and changing its elements in C inside a for loop
I am new to C and currently learning arrays. I have this code:
#include
int main()
{
int available[6];
for(int o=1; o<=3; o++){
available[o]=20;
printf("%d\n",&available[o]);
}
return 0;
}
Which is…
user13539846
- 425
- 2
- 5
- 13
4
votes
1 answer
Why can function pointers be used with or without the address of operator?
In the book, "Beginning C from Novice to Professional", the author does not use the address of operator when assigning a function to a function pointer. I typed in the code on my compiler both with and without the address of operator and it compiled…
Jinzu
- 1,325
- 2
- 10
- 22
3
votes
1 answer
Passing static method as argument, no address-of operator required?
class ThreadWorker
{
public:
ThreadWorker(void);
virtual ~ThreadWorker(void);
static void DoSomething();
};
int main()
{
boost::thread thread1(ThreadWorker::DoSomething);
boost::thread thread2(ThreadWorker::DoSomething);
…
User
- 62,498
- 72
- 186
- 247
3
votes
3 answers
pointer argument receiving address in c++?
int y=5;
int *yPtr = nullptr;
yPtr = &y;
I understand that the pointer stores the address of y. and calling *yPtr dereferences y.
If I have a call to the void function:
int main()
{
int number = 5;
function( &number );
}
void function( int…
user3348712
- 161
- 10
2
votes
1 answer
Assigning a procedure to dynamically created object
I want to dynamically create TImage controls and then drag and drop them. But if I want to assign the procedure used for the dragging to an event of this Image, it gives me:
Error: Wrong number of parameters specified for call to "ClickEvent"
This…
Boi
- 25
- 4