Re: [Boost-users] [!! SPAM] [Boost.Wave] util::file_position<> and asserted !is_escaped_lit(..) requirement

Subject: Re: [Boost-users] [!! SPAM] [Boost.Wave] util::file_position<> and asserted !is_escaped_lit(..) requirement
From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2011-08-13 12:17:45

> (Using namespace boost::wave here on.)
> 
> It seems that util::file_position<> has an assertion that checks if a
> given filename contains any following sequences: <\\>, <\"> or <\?> (using
> util::debug::is_escaped_lit).
> 
> I wonder why file_position<> does need to check this and if it's so
> crucial why it's done using a mere BOOST_ASSERT?
> 
> Now, here's comes the reason why I'm asking this: At least with MSVC9's
> remote debugger (or some other lowlevel component; not really the
> interesting part
> here) translates all network shares on a remote computer to UNC-paths.
> This is correct behaviour and actually a very neat feature. However, as
> you might be already aware at this point this leads to the actual problem:
> Any UNC-path triggers (consider <\\foo\path\file>) the assertion and
> things go boom.
> 
> It is not possible to easily work around this by refactoring user code
> and/or input values as provided filenames are completed internally using
> util::complete_path (after which <file> becomes <\\foo\path\file> etc. in
> this case).
> 
> I tried to disable this assertion (actually, there's two; one in the
> constructor and one in the set_file member function) and didn't see any
> strange behaviour. E.g. std::ifstream handling with UNC-paths in
> iteration_context_policies::load_file_to_string::inner<> worked just fine,
> as expected from a native STL.
> 
> Goes without saying that I'm using the latest Boost version (1.47.0). I
> would be very pleased if anyone could shed some light on this matter or
> better still
> - fix it permanently.

Right, that's apparently a leftover from old boost.filesystem times, when it
did not support UNC paths. I'll remove the checks asap.

Regards Hartmut
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