[boost] Filesystem: chars never allowed in generic file/dir name

From: Beman Dawes (bdawes_at_[hidden])
Date: 2002-11-21 08:14:53

The filesystem library traffics in generic paths, which contain directory 
or file names.

Because they seem so likely to be non-portable, the following characters 
are prohibited in generic names (but not in system_specific names):

    0x00 - 0x1F
    <
    >
    :
    "
    /
    \
    |
    *
    ?

This restriction wasn't documented during the formal review, so I'm 
mentioning it now to see if anyone cares to comment.

--Beman