union.sizeof

[ag0aep6g via Digitalmars-d-learn]

On 03/25/2017 11:37 PM, zabruk70 wrote:
> union Union1
> {
>   align(1):
>   byte[5] bytes5;
>   struct
>   {
>     align(1):
>     char char1;
>     uint int1;
>   }
> }
>
> void main ()
> {
>   import std.stdio: writefln;
>   writefln("Union1.sizeof=%d", Union1.sizeof);  //prints 8, not 5
> }

I'm not sure how the align stuff is supposed to work exactly, but you 
get 5 when you add `align(1)` to the union itself, too:

----
align(1) union Union1
{
   align(1):
   byte[5] bytes5;
   struct
   {
     char char1;
     uint int1;
   }
}

pragma(msg, Union1.sizeof); /* "5LU" */
----