boost::fusion::vector_tie(args...) Error

[agerlach]

Denis, I am trying to migrate my develop environment from OSX to Ubuntu, but I am having problems getting my symbolic examples (#202, #203) to compile on the Ubuntu side. Your symbolic example compiles fine. The compiler spits back many errors like:

/usr/local/include/boost/fusion/container/generation/detail/preprocessed/vector_tie10.hpp:47:5: note: template argument deduction/substitution failed:
In file included from /src/main.cpp:160:0:
/vexcl/vexcl/generator.hpp:678:46: note: candidate expects 2 arguments, 18 provided
boost::fusion::vector_tie(args...),

Is this a boost & c++11 issue? I tried both apt-get install libboost-all-dev and manually compiling boost 1.56 via the following with the same results:

$ ./bootstrap.sh --with-toolset=gcc --prefix=/usr/local
$ ./b2 -j4 toolset=gcc variant=release link=shared threading=multi address-model=64 cxxflags=-std=c++11 install

Do you have any suggestions?

[ddemidov]

Could you please provide a full example to try?

[ddemidov]

This could be related: http://stackoverflow.com/questions/2547787/boost-fusion-strange-problem-depending-on-number-of-elements-on-a-vector. Namely, boost::fusion may have a limit on the maximum number of arguments that may need to be increased.

[agerlach]

I just tried printing out BOOST_FUSION_INVOKE_PROCEDURE_MAX_ARITY both in OSX and Ubuntu and they both print 6, so I don't think that's the issue. I didn't expect such a quick response! I need to call it quits for the day, I'll look at it more early next week. Thanks.

[ddemidov]

A possible workaround would be to use the new runtime interface from #205.

[agerlach]

I tried adding #define BOOST_FUSION_INVOKE_PROCEDURE_MAX_ARITY 25 per your link, but I get the same errors. I am still working through this, but I noticed a discrepancy in the results returned depending on what runtime interface is used. I will submit this as a new issue.

[agerlach]

Upgrading from Boost 1.56 to 1.60 fixes this issue. I am working on putting an example together for you that demonstrates this.

[ddemidov]

I can reproduce this with boost 1.56. The problem is that fusion::vector_tie is defined for up to 10 parameters in 1.56. Since then, they replaced the definition of vector_tie to use c++11 variadic templates. Anyway, 23da8da gets rid of fusion::vector_tie in implementation of the generated kernel, so you should be able to use boost 1.56 again if you need to.