Re: [boost] [program_options, type_traits] is_reference and VC 7.0

From: John Maddock (john_at_[hidden])
Date: 2005-06-06 05:06:43

> The problem is that on VC 7.0 specializations for remove_reference must be
> defined explicitly, and it's not done for string and wstring.
>
> I see three choices:
>
> 1. Declare specialization for string and wstring in program_options
> 2. Declare them somewhere in type_traits
> 3. Mark 7.0 as unsupported.
> 4. Don't use any_cast to reference type
>
> I don't like (4) because I've introduced cast to reference myself 
> explicitly
> for program_options sake. (1) can lead to conflicts with user code. So it
> leaves (2) and (3). Any opinions which one is better?

I'm sympathetic towards (2), but it means making type_traits depend upon 
<string> and all that brings in (I've just checked and the header doesn't 
pull <string> in at present).  It seems a shame to make VC7 unsupported, 
just for the lack of an include however.

What does anyone else think?  Note that the dependency on <string> would be 
for broken compilers *only*.

John.