Re: [Boost-users] Difficulty using promises and futures

On Thu, Apr 11, 2013 at 5:03 PM, Vicente J. Botet Escriba < vicente.botet@wanadoo.fr> wrote:

Le 11/04/13 00:15, Michael Powell a écrit :

Hello,

...

I would like to use promises and futures in our embedded app.

We're targeting ArchLinux ARM. I believe we can build against a GCC 4.7.2 toolchain which has either C++0x or possibly even C++11 (somewhat) support.

I am trying to setup a couple of simple issues to make it even compile, but am having trouble.

boost::packaged_task > int_vect_pt_(simple_vector_* *getter); boost::unique_future > int_vect_f_ = int_vect_pt_.get_future(); boost::thread task(boost::move(int_vect_pt_)**);

boost::packaged_task<int> int_pt_(simple_getter); boost::unique_future<int> int_f_ = int_pt_.get_future(); boost::thread task(boost::move(int_pt_));

Error(s):

Description Resource Path Location Type 'boost::move' is ambiguous ' Candidates are: boost::type move(boost::packaged_task<int> &) ' optics.cpp /detector/devices line 156 Semantic Error

Description Resource Path Location Type 'boost::move' is ambiguous ' Candidates are: boost::type move(boost::packaged_task>> &) ' optics.cpp /detector/devices line 152 Semantic Error

Can anyone help or otherwise advise? I've even got a "crude" future implementation in C# .NETCF for pity's sake... Anyway, if necessary, what did we do before promises/futures? ;-)

Hi,

some question: * which are the ambiguities the compiler finds? I see only one prototype for each line. * which vector are you using std::

Yes, std::vector.

* are you compiling with -std=c++0x or -std=c++11?

Presently I am building with c++11 (preferred) using a GCC 4.7.2 based toolchain I believe.

* what version of Boost.Thread are you using? are you defining BOOST_THREAD_VERSION? I suggest you to define it to 4 either at the command line/build system or on your source file.

Not sure I understand where to define BOOST_THREAD_VERSION exactly? Is that during the application build? Or during the boost build? If app, could define that in the (CodeBench) compiler flags. Or in the source file, I suppose, but that starts to get tricky with include dependencies and such. I gather in our app preprocessor defines, BOOST_THREAD_VERSION=4, but I could be wrong. I'll check that out.

Please could you provide a complete example with the command line you are using?

That'll come next if these don't address the issue. Also I'm circling back on it at the moment. Thank ye.

Best, Vicente ______________________________**_________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/**mailman/listinfo.cgi/boost-**usershttp://lists.boost.org/mailman/listinfo.cgi/boost-users