Re: [Boost-users] RTTI for VC 6

to put it bluntly, it's not boost, it VC++6.0 (the plethora of errors) upgrading would save you and a lot of others a lot of problems At Saturday 2004-08-14 18:15, you wrote:

----- Original Message ----- From: "Peter Dimov" To: Sent: Wednesday, August 11, 2004 3:40 AM Subject: Re: [Boost-users] RTTI for VC 6

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Samuel wrote:

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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.

I don't understand this. I did not reply earlier since I assumed it does not matter, and I still assume that whoever might be concerned about this can be the one to decide the relevance. However if you are saying that a warning will result from not using dynamic_cast then you did not read my message. The problem is that the compiled program did not work; it produced unexpected results (I forget the details). The unexpected results could easily cause someone else more work to solve.

There might have been a warning, but Boost produces so many other warnings that I missed the warning if there was one. I don't like ignoring warnings and I usually use the (VC) option that causes all warnings to be errors, but I can't do that when I use Boost. I should try to eliminate the warnings and I will make more attempts to do that soon.

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