Re: [Boost-users] RTTI for VC 6

From: Peter Dimov (pdimov_at_[hidden])
Date: 2004-08-11 05:40:05

Samuel wrote:
> VC 6 has an option for Run-Time Type Information (RTTI) that is
> normally off. I was able to compile and execute a sample program that
> had a problem. I noticed that Boost uses RTTI (such as the
> dynamic_cast operator), so I checked to see if the option was on; it
> was not. I turned the option on and the program worked.
>
> That problem is probably a known problem, but something such as the
> following can be added somewhere to not allow a VC 6 program to even
> compile if the RTTI option is off. I think it could make things a
> little easier for some beginners.
>
> #  if !defined(_CPPRTTI)
> #      error "Boost requires use of RTTI"
> #  endif

Some parts of Boost need RTTI, some do not. It is not reasonable to reject a
program that doesn't ever invoke a dynamic_cast on a polymorphic type (which
is a level 1 warning IIRC) just because it happens to include a boost
header.