Re: [boost] Review Requests: shifted_ptr, list, stack & roofof

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-03-13 12:24:43

AMDG

Phil Bouchard wrote:
> "David Abrahams" <dave_at_[hidden]> wrote in message 
> news:87skyvltul.fsf_at_gutsy.luannocracy.com...
>
> [...]
>
>   
>> If I understand correctly, none of this code is technically portable; it
>> is only "portable in practice" because of the way C++ is commonly
>> implemented.  Is that correct?
>>
>> It's not necessarily an argument against these proposals, but all Boost
>> library submissions should be very clear about where they rely on
>> unspecified or undefined behavior.
>>     
>
> No it is perfectly portable, this function called "roofof" simply cannot be 
> applied to classes having virtual inheritance.  It can be kept as an 
> internal routine quite simply and used with PODs and classes having simple 
> inheritances.
>
>   

roofof /does/ use undefined behavior.
You can't just go dereferencing the null pointer...

((T *)(0)->* q)

In Christ,
Steven Watanabe