shouldn't cast(Object)cast(void*)anything work?

[Brad Roberts]

On Thu, 5 Apr 2007, Davidl wrote:

> union __exp
> {
>      Expression _m_exp;
>      int i;
> }
> 
> __exp EXP_CANT_INTERPRET;
> 
> static this()
> {
>    EXP_CANT_INTERPRET.i=1;
> }
> 
> and i don't get why i can't use the following work:
> 
> //in order to get rid of the runtime extra var

There's no extra 'runtime' anything involved here, just a more concrete 
expression of what you're trying to express than casting.

> union _EXP_CANT_INTERPRET  // coz we can't use an union as an instance
> {
>    Expresssion _m_exp;
>    int i=1;
> }
> _EXP_CANT_INTERPRET EXP_CANT_INTERPRET;  //compiler complains overlap
> initializer?? strange
> 
> and this won't work either:
> 
> struct _EXP_CANT_INTERPRET
> {
>   union
>   {
>       Expression _m_exp;
>       int i=1;		//this would either complain overlap initializer of
> struct _EXP_CANT_INTERPRET
>   }
> }
> _EXP_CANT_INTERPRET EXP_CANT_INTERPRET


The 'problem' here is the initializer you've specified on the second 
member of the union.  Take that out and the message would go away I 
suspect.  I also suspect, though haven't tried, that if the int i was 
first rather than second, that the error would also go away.

Later,
Brad