• Andrei Alexandrescu (15/15) Oct 04 2009 I figured out a way to get the offsetof any member statically:
• Lutger (3/25) Oct 05 2009 This question was on .learn, from where the answer (by Jarret) was:
• Andrei Alexandrescu (3/32) Oct 05 2009 Thanks, Lutger and Max!
• Max Samukha (3/18) Oct 05 2009 __traits(classInstanceSize, A)
• Denis Koroskin (3/26) Oct 05 2009 sizeof(A) doesn't compile.

Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> writes:

I figured out a way to get the offsetof any member statically:

class A {
     char a;
     int b;
     char c;
}

void main()
{
     int[A.init.a.offsetof]  x;
}

Unfortunately, I can't figure a way to get the class' size statically. 
This doesn't work:

     int[A.classinfo.init.length]  x;

Any way to fetch the size of A?


Andrei

Lutger <lutger.blijdestijn gmail.com> writes:

Andrei Alexandrescu wrote:

 I figured out a way to get the offsetof any member statically:
 
 class A {
      char a;
      int b;
      char c;
 }
 
 void main()
 {
      int[A.init.a.offsetof]  x;
 }
 
 Unfortunately, I can't figure a way to get the class' size statically.
 This doesn't work:
 
      int[A.classinfo.init.length]  x;
 
 Any way to fetch the size of A?
 
 
 Andrei

This question was on .learn, from where the answer (by Jarret) was: 
__traits(classInstanceSize, Class)

Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> writes:

Lutger wrote:
 Andrei Alexandrescu wrote:
 
 I figured out a way to get the offsetof any member statically:

 class A {
      char a;
      int b;
      char c;
 }

 void main()
 {
      int[A.init.a.offsetof]  x;
 }

 Unfortunately, I can't figure a way to get the class' size statically.
 This doesn't work:

      int[A.classinfo.init.length]  x;

 Any way to fetch the size of A?


 Andrei

 
 This question was on .learn, from where the answer (by Jarret) was: 
 __traits(classInstanceSize, Class)
 
 

Thanks, Lutger and Max!

Andrei

Max Samukha <spambox d-coding.com> writes:

On Mon, 05 Oct 2009 01:47:21 -0500, Andrei Alexandrescu
<SeeWebsiteForEmail erdani.org> wrote:

I figured out a way to get the offsetof any member statically:

class A {
     char a;
     int b;
     char c;
}

void main()
{
     int[A.init.a.offsetof]  x;
}

Unfortunately, I can't figure a way to get the class' size statically. 
This doesn't work:

     int[A.classinfo.init.length]  x;

Any way to fetch the size of A?


Andrei

__traits(classInstanceSize, A)

"Denis Koroskin" <2korden gmail.com> writes:

On Mon, 05 Oct 2009 14:13:06 +0400, Nick Sabalausky <a a.a> wrote:

 "Andrei Alexandrescu" <SeeWebsiteForEmail erdani.org> wrote in message
 news:hac4pl$1s2e$1 digitalmars.com...
 I figured out a way to get the offsetof any member statically:

 class A {
     char a;
     int b;
     char c;
 }

 void main()
 {
     int[A.init.a.offsetof]  x;
 }

 Unfortunately, I can't figure a way to get the class' size statically.
 This doesn't work:

     int[A.classinfo.init.length]  x;

 Any way to fetch the size of A?

 sizeof(A) doesn't work?

sizeof(A) doesn't compile.

A.sizeof == Object.sizeof == (void*).sizeof