• =?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> Jan 11 2010
• bearophile <bearophileHUGS lycos.com> Jan 11 2010
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> Jan 11 2010

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

Coming from C++, I wonder whether it is ever needed to get the address 
of the object? If so, how?

The & operator below produces the address of the class reference 
(variable). How about the class object?

class C
{}

void main()
{
     auto variable = new C;
     auto address = &variable;
}

Thank you,
Ali

bearophile <bearophileHUGS lycos.com> writes:

Ali Çehreli Wrote:

 Coming from C++, I wonder whether it is ever needed to get the address 
 of the object? If so, how?


I've never had to do this in D. I think you can just cast the class reference
to void* and then to the pointer you want, something like (untested):

Foo f = new Foo;
auto p = cast(something*)cast(void*)f;

Bye,
bearophile

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

bearophile wrote:
 Ali Çehreli Wrote:
 
 Coming from C++, I wonder whether it is ever needed to get the address 
 of the object? If so, how?


 I've never had to do this in D. I think you can just cast the class reference
to void* and then to the pointer you want, something like (untested):
 
 Foo f = new Foo;
 auto p = cast(something*)cast(void*)f;
 
 Bye,
 bearophile


Thanks,

Seems to do the trick:

import std.cstream;

class C
{}

void main()
{
     auto variable0 = new C;
     auto variable1 = variable0;

     dout.writefln("&variable0 : ", &variable0);
     dout.writefln("&variable1 : ", &variable1);
     dout.writefln("cast cast 0: ", cast(C*)cast(void*)variable0);
     dout.writefln("cast cast 1: ", cast(C*)cast(void*)variable1);
}

Outputs:

&variable0 : BFE65A30
&variable1 : BFE65A34
cast cast 0: C08E40
cast cast 1: C08E40

I trust that the last two are the address of the actual object. ;)

Ali