Was looking through the D changelog and found that .sizeof was made un-overridable.  I remember when it wasn't.. in any case, I had a hunch, and tried a few other things.  I found two more bugs.

import std.stdio;

class A
{
 static uint alignof()
 {
  return 30;
 }

 int b;
}

void main()
{
 // this really shouldn't be legal
 writefln(A.alignof);

 // this line causes errors
 //writefln(A.b.offsetof);
}

Note that .alignof can be redefined (bad), and for some reason, .offsetof causes the following errors:

dtest.d(19): 'this' is only allowed in non-static member functions
dtest.d(19): this for b needs to be type A not type int

Using .offsetof on a member of an instantiated A works, however.  This is inconsistent with the struct behavior, which is exactly the opposite - gives an error when trying to use .offsetof on a member of an instantiated struct, but works when using the struct type (i.e. for struct A with member b, A.b.offsetof).

"Jarrett Billingsley" <kb3ctd2@yahoo.com> wrote in message news:d4c3qc$eu8$1@digitaldaemon.com...

Just found another!  I can overload offsetof as well.

import std.stdio;

class A
{
 this()
 {
  b=new B;
 }

 class B
 {
  uint offsetof()
  {
   return 6756;
  }
 }
 B b;
}

void main()
{
 A a=new A;
 writefln(a.b.offsetof);
}

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Jarrett Billingsley schrieb am Fri, 22 Apr 2005 20:14:42 -0400:
> Was looking through the D changelog and found that .sizeof was made un-overridable.  I remember when it wasn't.. in any case, I had a hunch, and tried a few other things.  I found two more bugs.
>
> import std.stdio;
>
> class A
> {
>  static uint alignof()
>  {
>   return 30;
>  }
>
>  int b;
> }
>
> void main()
> {
>  // this really shouldn't be legal
>  writefln(A.alignof);
>
>  // this line causes errors
>  //writefln(A.b.offsetof);
> }
>
> Note that .alignof can be redefined (bad), and for some reason, .offsetof causes the following errors:
>
> dtest.d(19): 'this' is only allowed in non-static member functions
> dtest.d(19): this for b needs to be type A not type int
>
> Using .offsetof on a member of an instantiated A works, however.  This is inconsistent with the struct behavior, which is exactly the opposite - gives an error when trying to use .offsetof on a member of an instantiated struct, but works when using the struct type (i.e. for struct A with member b, A.b.offsetof).

Added to DStress as http://dstress.kuehne.cn/nocompile/alignof_01.d http://dstress.kuehne.cn/nocompile/alignof_02.d http://dstress.kuehne.cn/nocompile/alignof_03.d http://dstress.kuehne.cn/nocompile/alignof_04.d http://dstress.kuehne.cn/nocompile/offsetof_74.d http://dstress.kuehne.cn/nocompile/offsetof_75.d http://dstress.kuehne.cn/nocompile/offsetof_76.d http://dstress.kuehne.cn/nocompile/offsetof_77.d

Thomas


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