• Andrew Chapman (15/15) Feb 15 2017 Hi all, sorry if this question is silly, but is it possible to
• Jonathan M Davis via Digitalmars-d-learn (5/17) Feb 15 2017 This does _not_ give you the address of the Node object. It gives you th...
• Jonathan M Davis via Digitalmars-d-learn (6/29) Feb 15 2017 IIRC, the only way to get the address of the object itself would be to c...
• Andrew Chapman (6/36) Feb 15 2017 Thanks Jonathan. Good point about the reference address. I can
• Jacob Carlborg (16/19) Feb 16 2017 If it's only for printing you can use the C "printf" without any casting...

Andrew Chapman <nycran gmail.com> writes:

Hi all, sorry if this question is silly, but is it possible to 
get the address of an object within the object itself?

e.g.

class Node
{
     this()
     {
         writeln(&this);  // Doesn't work
     }
}

auto node = new Node();
writeln(&node); // Does work

Thanks very much,
Cheers,
Andrew.

Jonathan M Davis via Digitalmars-d-learn writes:

On Wednesday, February 15, 2017 21:27:00 Andrew Chapman via Digitalmars-d-
learn wrote:
 Hi all, sorry if this question is silly, but is it possible to
 get the address of an object within the object itself?

 e.g.

 class Node
 {
      this()
      {
          writeln(&this);  // Doesn't work
      }
 }

 auto node = new Node();
 writeln(&node); // Does work

This does _not_ give you the address of the Node object. It gives you the
address of the reference.

- Jonathan M Davis

Jonathan M Davis via Digitalmars-d-learn writes:

On Wednesday, February 15, 2017 13:33:23 Jonathan M Davis via Digitalmars-d-
learn wrote:
 On Wednesday, February 15, 2017 21:27:00 Andrew Chapman via Digitalmars-d-
 learn wrote:
 Hi all, sorry if this question is silly, but is it possible to
 get the address of an object within the object itself?

 e.g.

 class Node
 {

      this()
      {

          writeln(&this);  // Doesn't work

      }

 }

 auto node = new Node();
 writeln(&node); // Does work

 This does _not_ give you the address of the Node object. It gives you the
 address of the reference.

IIRC, the only way to get the address of the object itself would be to cast
it to void*, but it's not something that I do normally, so I'd have to
experiment a bit to be sure.

- Jonathan M Davis

Andrew Chapman <nycran gmail.com> writes:

On Wednesday, 15 February 2017 at 21:37:12 UTC, Jonathan M Davis 
wrote:
 On Wednesday, February 15, 2017 13:33:23 Jonathan M Davis via 
 Digitalmars-d- learn wrote:
 On Wednesday, February 15, 2017 21:27:00 Andrew Chapman via 
 Digitalmars-d- learn wrote:
 Hi all, sorry if this question is silly, but is it possible 
 to get the address of an object within the object itself?

 e.g.

 class Node
 {

      this()
      {

          writeln(&this);  // Doesn't work

      }

 }

 auto node = new Node();
 writeln(&node); // Does work

 This does _not_ give you the address of the Node object. It 
 gives you the address of the reference.

 IIRC, the only way to get the address of the object itself 
 would be to cast it to void*, but it's not something that I do 
 normally, so I'd have to experiment a bit to be sure.

 - Jonathan M Davis

Thanks Jonathan.  Good point about the reference address.  I can 
work around this quite easily, but I was curious.  I will try the 
void* cast and see what happens.

Cheers.

Jacob Carlborg <doob me.com> writes:

On 2017-02-15 22:42, Andrew Chapman wrote:

 Thanks Jonathan.  Good point about the reference address.  I can work
 around this quite easily, but I was curious.  I will try the void* cast
 and see what happens.

If it's only for printing you can use the C "printf" without any casting:

import core.stdc.stdio;

class Node
{
     this()
     {
         printf("%p\n", this);
     }
}

void main()
{
     new Node;
}

-- 
/Jacob Carlborg