Re: [boost] [Boost-bugs] [ boost-Bugs-1461533]Non-basic-source-character-set characters conflict with MSVC

From: Yuval Ronen (ronen_yuval_at_[hidden])
Date: 2006-04-02 14:55:35

Andy Little wrote:
> "AlisdairM"  wrote
> 
>>Andy Little wrote:
>>
>>
>>>The characters allowed in source files are actually laid down in the
>>>C+ standard AFAIK. That is limited to the characters allowed in the
>>>grammar and I'm fairly sure that doesnt include e.g the copyright
>>>symbol etc.
>>
>>The standard is actually not very helpful on this score:
>>
>>For the first phase of translation:
>>"Physical source file characters are mapped, in an
>>implementation-defined manner, to the basic source character set"
>>
>>>From that point on, the standard works in terms of the basic source
>>character set, but as the mapping to get there is implementation
>>defined the source file can use any format the vendors want to support,
>>including extended characters (which generally map to \0x... sequences)
> 
> 
> OK Thats very helpful...
> 
> For boost source files that makes the answer quite simple, because boost works
> with multiple vendors so the set of characters allowable in boost source files
> should consist of  ( set of characters allowed by vendor A ) &  ( set of
> characters allowed by vendor B )  & ...(set of characters allowed by vendor X )
> |  (Set of characters which after mapping become characters allowed outside
> comments )
> 
> Which assuming vendor X is unknown reolves to: (Set of characters which after
> mapping become characters allowed outside comments)

Why "outside comments"? AFAIU, the problem is high-ASCII chracters found 
in comments, which emits the warning the OP complained about. He 
actually didn't say that explicitly, but I don't think there are any 
such chracters in Boost code itself, only in comments. IOW, this 
discussion is about "inside comments", not outside...