> -----Original Message-----
> From:
boost-users-bounces@lists.boost.org
> [mailto:
boost-users-bounces@lists.boost.org] On Behalf Of Peng Yu
> Sent: September 19, 2008 3:47 PM
> To:
boost-users@lists.boost.org
> Subject: [Boost-users] Why something like #ifndef
> BOOST_MPI_HPP is alwayscapitalized?
>
> Hi,
>
> In most of the C++ header files I've seem, a macro like the
> following is used to guard repetitive inclusion of the file.
> I'm wondering why it is always in upper case. Why not make it
> the same case as the file name?
>
> What if there are two header files on is in lower case, the
> other is in upper case?
>
> Thanks,
> Peng
>
> #ifndef BOOST_MPI_HPP
>
>
>