Re: Caveat with lua_pushlightuserdata(L, (void *)&key)

[David Jones <drj@...>]

On 26 Jun 2006, at 09:33, Andreas Stenius wrote:

> Julien Cugnière skrev:
> > Anyway, here is a simple way to ensure that your constants are unique
> > (assuming this legal C):
> >    static const void* regkey1 = &regkey1;
> >    static const void* regkey2 = &regkey2;
>
> No, &regkey1 is not a constant expression, although the result is  
> constant.

Doesn't matter.  In C it's legal (though probably stupid) to take a  
pointer to a const object and convert it to a pointer to a non-const  
object.  No idea about C++.  Just one of the many ways in which const  
is broken and surprises programmers.

drj