Problems with PR 21210

[Mark Mitchell]

Gabriel Dos Reis wrote:
> Mark Mitchell <mark@codesourcery.com> writes:

>   template<class T>
>    inline complex<T> 
>    make_std_complex(T __complex__ z)
>    {
>       return complex<T>(__real__ z, __imag__ z);
>    }
> 
> has zero abstraction penalty.  
> 
> I'm very reluctant to additions of constructors.

That's OK with me -- if you're willing to accept the fact that this will 
silently change the meaning of:

   __complex__ double c99_cd;
   complex<double> cpp_cd(c99_cd);

I just want to make sure that you're aware that what you're suggesting 
will change that; it will now simply copy the real part, and ignore the 
imaginary part.

-- 
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com
(916) 791-8304