Re: [boost] Re: Problem with type_with_alignment.hpp

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2003-09-03 14:25:46

Daniel Frey wrote:
Hartmut Kaiser wrote:
> Hi all,
>
> The current version of the file type_with_alignment.hpp gives spourios
> errors, because some macro expansion code generates '>>' instead of '>
>
>>' (closing template brackets). The corresponding fixing patch is
>
> attached.
>
> Just out of curiousity: Is this a workaround for a compiler bug?

It is.

> I think
> I remember that if generated by the preprocessor, tokens need to be
> glued with ## to form a single new token like >>, otherwise even two
> consecutive >'s will be treated like two tokens. My colleague says I'm
> wrong. Am I? :)

Nope, you are right. Macro replacement happens after tokenization, and at
that stage the only way to produce a new token is to use the ## operator.

Aleksey