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List: boost
Subject: [boost] [scope_exit] Boost.ScopeExit capturing 'this'
From: adam.butcher () selex-comms ! com
Date: 2009-02-27 11:40:46
Message-ID: OF147B2619.FFE69B42-ON8025756A.002F8EDF-8025756A.00402A7E () Selex-Comms ! com
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I wasn't sure whether I had the correct address for Boost.ScopeExit's
author Alexander Nasonov, so I've submitted to this list just in case and
to get feedback from other users.
I have been playing with BOOST_SCOPE_EXIT -- it it very convenient.
One thing I would have liked would be to capture 'this' inside member
functions. I have created a patch which adds BOOST_SCOPE_EXIT_THIS to
do just that. It provides an operator->() in the generated struct
which can be used to access the enclosing class's members.
The syntax is:
BOOST_SCOPE_EXIT_THIS( (&a) (&b) )
{
a; b; // local captures
(*this)->member; // member access
}
BOOST_SCOPE_EXIT_END;
and can be
BOOST_SCOPE_EXIT_THIS()
{
(*this)->member;
}
BOOST_SCOPE_EXIT_END;
providing the preprocessor allows for empty parameter lists (which gcc
does and vc does albeit after disabling a warning to remove noise).
The type pointed to by the result of operator->() is correctly cv
qualified.
It has been tested on gcc 4.3, gcc 4.2, msvc 7.1 and msvc 9.0. I don't
have access to other compilers.
Boost.Typeof worked fine on gcc for typeof(this) -- mostly because gcc
has a native typeof I guess.
On visual studio (vc71 and vc90) it was not so good -- a compiler bug
(
http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=331418
,
http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=365549
)
that has been marked as 'Won't fix' means that 'this' cannot be used
in expressions within template argument lists -- even if those
expressions are innocuous typeid()s or sizeof()s for type-inference.
The common workaround (capturing a compile-time integer with an
enumerator and using the enumerator in the template parameter list)
doesn't work with the vc71-specific implementation of Boost.Typeof
since it is based on typeid() -- this cannot be captured in a
compile-time expression (or I know of no way to that doesn't involve
the expression existing in a template argument list).
All is not lost though -- the general-purpose sizeof() based approach
for the other VC versions works fine for VC71 for determining the
typeof 'this'. As such my patch includes a VC>=1300 specific
workaround for typeof 'this' determination. This is unfortunate but I
couldn't think of any other non-intrusive way of doing it.
Please find the attached patch and let me know what you think -- I'm
sure this feature would be useful to users -- it saves having to do:
TypeOfMyClassWhichCouldBeTedious* self = this
BOOST_SCOPE_EXIT( (&self) )
{
self->member;
}
BOOST_SCOPE_EXIT_END;
which removes the convenience of BOOST_SCOPE_EXIT in these contexts
since something like:
struct at_end { TypeOfMyClassWhichCouldBeTedious* self; ~at_end()
{
self->member;
}
} at_end = {this};
can be done without any dependencies to achieve the same result.
Regards,
Adam.
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