Re: [boost] [preprocessor] Patch for stringize.hpp

From: David Abrahams (dave_at_[hidden])
Date: 2006-02-17 22:03:08

"Steve Cornett" <boost_at_[hidden]> writes:

> The file boost/preprocessor/stringize.hpp contains a trivial bug,
> for which I have attached a proposed patch.  The problem is that
> there are three incorrect usages of the ## operator.  The proposed
> fix is to simply remove the ## operators, as they are unnecessary.
>
> The ## operator joins two tokens and makes a new single token.  But
> all three usages of ## in this file attempt to join an identifier
> with '(', which does not result in a single token.  The action taken
> by most C/C++ translators in this situation is to rescan the invalid
> text back into two tokens, which makes the incorrect ## usage
> innocuous in most situations.  However, the behavior is undefined by
> the C++ and C standards.  With our code coverage tool, this improper
> ## usage results in a warning.

Does your tool account for illegal code that may be necessary to work
around buggy C++ [preprocessor] implementations?
-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com