nested unions and structs

[Alberto Simon]

It looks like I didn't explain myself. I expect that when I declare a DWord
union and try to access its fields, Data should have the same address LowerWord
has and the same address Low on LowerWord has, but that does not happen, Data
instead is 4 bytes after LowerWord, and that ticks me, since all fields of an
union should start at the same address.

In article <e2q4a7$ljq$1 at digitaldaemon.com>, Oskar Linde says...
>
>Alberto Simon wrote:
>> The union DWord below does not product the expected union, Data isn't at the
>> same address as the union start address is... What should I do to correct that??
>> 
>> public union Word
>> {
>> // Atributos
>> 
>> struct
>> {
>> public ubyte Low;
>> public ubyte High;
>> }
>> public ushort Data;
>> }
>> 
>> public union DWord
>> {
>> // Atributos
>> 
>> public uint Data;
>> struct
>> {
>> public Word HigherWord;
>> public Word LowerWord;
>> };
>> }
>
>On what platform & compiler? On Linux dmd 0.154 they are for me:
>
>   Word w;
>   DWord d;
>   writefln("%s %s",&d,&(d.Data));
>   writefln("%s %s",&w,&(w.Data));
>
>Prints:
>
>bfffed24 bfffed24
>bfffed20 bfffed20
>
>/Oskar

Regards,
Alberto Simon (20y student)