Re: [boost] [type_traits] possible regression on is_function trait

Subject: Re: [boost] [type_traits] possible regression on is_function trait
From: John Maddock (boost.regex_at_[hidden])
Date: 2012-11-06 03:53:28

> I don't know if this is a regression on Boost.TypeTraits or if I'm using 
> incorrectly the is_function trait.

Ideally it shouldn't be possible to use it incorrectly, which isn't to say 
that there aren't corner cases...

> John, could you confirm there is a bug  in is_function?

If the failure is specific to one test runner, then I suspect a compiler 
bug: do you have a reduced test case I can look at?

John.

> Test output: Sandia-darwin-4.4 - thread - async__async_p / darwin-4.4
> Rev 81191 / Mon, 5 Nov 2012 06:30:00 +0000
> *Report Time: *Mon, 5 Nov 2012 14:19:58 +0000
> Compile [2012-11-05 07:50:44 UTC]: fail
>
>     "/opt/local/bin/g++-mp-4.4"  -ftemplate-depth-128 -O0 -fno-inline -Wall 
>  -pedantic -g -dynamic -gdwarf-2 -fexceptions -fPIC -Wextra -Wno-long-long 
>  -fpermissive -pedantic -DBOOST_ALL_NO_LIB=1 -DBOOST_CHRONO_DYN_LINK=1 -DBOOST_SYSTEM_DYN_LINK=1 
>  -DBOOST_SYSTEM_NO_DEPRECATED -DBOOST_THREAD_BUILD_DLL=1 -DBOOST_THREAD_POSIX 
>  -DBOOST_THREAD_THROW_IF_PRECONDITION_NOT_SATISFIED -DBOOST_THREAD_USE_DLL=1 
>   -I".." -c -o 
> "/Volumes/scratch/kbelco/boost/results/boost/bin.v2/libs/thread/test/async__async_p.test/darwin-4.4/debug/threading-multi/sync/futures/async/async_pass.o" 
> "../libs/thread/test/sync/futures/async/async_pass.cpp"
>
> In file included from ../boost/type_traits/is_convertible.hpp:28,
>                  from ../boost/thread/detail/move.hpp:13,
>                  from ../boost/thread/future.hpp:20,
>                  from 
> ../libs/thread/test/sync/futures/async/async_pass.cpp:28:
> ../boost/type_traits/is_function.hpp: In instantiation of 
> 'boost::detail::is_function_chooser<false>::result_<boost::rv<boost::rv<boost::packaged_task<int()> 
>  > >&>':
> ../boost/type_traits/is_function.hpp:60:   instantiated from 
> 'boost::detail::is_function_impl<boost::rv<boost::rv<boost::packaged_task<int()> 
>  > >&>'
> ../boost/type_traits/is_function.hpp:102:   instantiated from 
> 'boost::is_function<boost::rv<boost::rv<boost::packaged_task<int()> > >&>'
> ../boost/type_traits/is_convertible.hpp:354:   instantiated from 'const 
> bool 
> boost::detail::is_convertible_impl<boost::rv<boost::packaged_task<int()> 
>  >&, boost::rv<boost::rv<boost::packaged_task<int()> > >&>::value'
> ../boost/type_traits/is_convertible.hpp:480:   instantiated from 
> 'boost::is_convertible<boost::rv<boost::packaged_task<int()> >&, 
> boost::rv<boost::rv<boost::packaged_task<int()> > >&>'
> ../boost/thread/future.hpp:2717:   instantiated from 'boost::future<T> 
> boost::async(boost::launch, R (*)()) [with R = int]'
> ../libs/thread/test/sync/futures/async/async_pass.cpp:117:   instantiated 
> from here
> ../boost/type_traits/is_function.hpp:52: error: forming pointer to 
> reference type 'boost::rv<boost::rv<boost::packaged_task<int()> > >&'
>
>
>
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