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Graph library noise in logs
by Emil Dotchevski 07 Jul '08

07 Jul '08

Isn't it a good idea to remove these messages from the Graph library Jamfile? warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. IMO this information belongs in the documentation. At present it is displayed every time I build anything that uses Boost, even if it doesn't use Graph. Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode

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[test][darwin][trunk] using some undefined signal macros on Power PC
by JOAQUIN M. LOPEZ MUÑOZ 07 Jul '08

07 Jul '08

Hello, I guess it is pretty apparent by now, but Boost.Test is causing a lot of regressions in the Sandia-darwin-ppc regression runner with the following: http://tinyurl.com/689u7x ../boost/test/impl/execution_monitor.ipp: In member function 'void boost::detail::system_signal_exception::report() const': ../boost/test/impl/execution_monitor.ipp:292: error: 'ILL_ILLOPN' was not declared in this scope ../boost/test/impl/execution_monitor.ipp:297: error: 'ILL_ILLADR' was not declared in this scope ../boost/test/impl/execution_monitor.ipp:312: error: 'ILL_PRVREG' was not declared in this scope ../boost/test/impl/execution_monitor.ipp:317: error: 'ILL_COPROC' was not declared in this scope ../boost/test/impl/execution_monitor.ipp:322: error: 'ILL_BADSTK' was not declared in this scope ../boost/test/impl/execution_monitor.ipp:332: error: 'FPE_INTDIV' was not declared in this scope ../boost/test/impl/execution_monitor.ipp:337: error: 'FPE_INTOVF' was not declared in this scope ../boost/test/impl/execution_monitor.ipp:367: error: 'FPE_FLTSUB' was not declared in this scope ../boost/test/impl/execution_monitor.ipp:397: error: 'BUS_ADRERR' was not declared in this scope ../boost/test/impl/execution_monitor.ipp:402: error: 'BUS_OBJERR' was not declared in this scope AFACIS <signal.h> does not define these macros in Power PC architectures, further confirmation of this fact here http://source.winehq.org/source/dlls/ntdll/signal_powerpc.c I guess it's easy enough to conditionally #define the offending parts out relying on defined(__POWERPC__). I'd propose a patch mysel but I don't have the appropriate environment to test locally with. And unfortunately we don't have a Darwin/PPC champion yet: http://svn.boost.org/trac/boost/wiki/PlatformChampions HTH, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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[flyweight] rw_locking policy patch for review
by Tim Blechmann 06 Jul '08

06 Jul '08

i have implemented a rw_locking policy for flyweight factories, based on boost::shared_mutex. to achieve that, i had to adapt the factory interface ... joaquín, would it be possible for you to review the patch? it is based against the version of flyweight from the boost sandbox svn ... best, tim -- tim(a)klingt.org http://tim.klingt.org Cheat your landlord if you can and must, but do not try to shortchange the Muse. It cannot be done. You can't fake quality any more than you can fake a good meal. William S. Burroughs

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BGL: Graph edges with greater than 2 vertices
by Aman Sinha 06 Jul '08

06 Jul '08

I am looking to build a graph where an edge can be incident on multiple vertices. I believe this is also called a hypergraph. The boost archives have some discussion of hypergraphs from way back in year 2002. Does anyone know what is the status of that? If is is not supported, is there a reasonable workaround to build such graphs? Thanks, Aman

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[utility/swap] Okay to add array support to Boost.Swap (sandbox/swap)?
by Niels Dekker - mail address until 2008-12-31 06 Jul '08

06 Jul '08

Hi Joe, hi Steven, Would it be okay to you if we would add support for array types to the Boost.Swap utility that is located in the sandbox? I'm asking now, because I wrote an issue, asking the C++ Standards Committee to add an overload of std::swap for array types. And Howard Hinnant just mailed me the other day that the issue has reached status Ready. :-) LWG issue 809, "std::swap should be overloaded for array types" http://home.twcny.rr.com/hinnant/cpp_extensions/issues_preview/lwg-active.h… Of course, it will still take a while before STL implementations will actually add such an std::swap overload. It isn't yet part of the Standard, officially. So I would very much appreciate if boost::swap would already start supporting array types. And I think it would be helpful when implementing swap member functions for templates like boost::value_initialized<T>. Array support could easily be added to swap/boost/utility/swap.hpp (http://svn.boost.org/trac/boost/browser/sandbox/swap/boost/utility/swap.hpp) by overloading boost_swap_impl::swap_impl, as follows: template<class T, std::size_t N> void swap_impl(T (& left)[N], T (& right)[N]) { for (std::size_t i = 0; i < N; ++i) { ::boost_swap_impl::swap_impl(left[i], right[i]); } } Please tell me what you think. I do have SVN write access, so I wouldn't mind committing the necessary changes. :-) Kind regards, -- Niels Dekker http://www.xs4all.nl/~nd/dekkerware Scientific programmer at LKEB, Leiden University Medical Center

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Question about boost::asio's design
by Yingfeng 06 Jul '08

06 Jul '08

I am using asio to my software and i have some design issue about asio and hope could get your idea about it. I plan to develop a server based on asio, which could support high concurrency with complicated back end tasks to be provided, that is to say, when received a request from a client, there exists a task involved with lots of disk io and many cpu cycles to serve that request. Therefore, some concurrency design pattern would be used together with a thread pool, such as Half-Asyn/Half-Syn or Leader/Followers. I have read some sources of Asio, i think the idea of using Reactor to implement Proactor is pretty cool. Here is what I have got from the code about the working flow: Take asyn_receive as an example: 1. A functor of receive_handler together with the socket descriptor is added to the read operation queue. 2. Reactor is blocked on the demulplex call such as select 3. When read is available, Reactor retrieves the read op from the read operation queue and invoke the functor named receive_handler 4. Reactor receive the data 5. After the data has been finished reading, another event with the handler which could be customed by users is posted to the read operation queue. ... According to the above flow, I can see that there exist two kinds of events in the operation queue: events to handle socket IO and events with completion handler customed by users. In the users' eye, the process of retrieving operation from queue and then invoke handler is proceeded within io_service::run(), therefore a thread pool should be binded with io_service::run(), which is just shown in the example of Http server 3. In the design pattern of Half-Asyn/Half-Syn or Leader/Followers, the working flow is: after retrieving an operation from the queue, then dispatch a thread to process that operation handler. However, in the asio's design, if I used the threadpool to io_service::run(), then both events of processing socket IO and completion handler will occupy the thread. I think this will cause more threading overhead. I think it is reasonable that only one thread to process the network IO, and other threads to process the task of completion handler. However, it is difficult to do that in the current design. Do you have any opinion about my situation? Very grateful! Yingfeng

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problems with boost exception in trunk?
by Robert Ramey 06 Jul '08

06 Jul '08

Current testing shows two compilers failing to link tests for the wide character version of the seriliazation library. For Comeau - the error is symbol already defined. It appears that certain symbols are instantiated in both the serialization library and its wide character brother. This results in a failure to link the tests. For Intel, there is a cryptic message related to symbol count - so it might or might not be the same issue. I would appear that the same code is getting instantiated in both libraries. If my analysis is correct, this problem could appear for any application which links to two or more boost libraries which use boost exception. Since we don't explicitly test for this, this we would generally have no way of knowing about this. Could whoever is responsible for the exception library please look into this? I hope that the version in the trunk has not yet been merged into the release. Robert Ramey

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[integer] Can anyone double-check this test?
by Daryle Walker 06 Jul '08

06 Jul '08

I'm trying to tweak Boost.Integer, and I noticed that only 3 of the 6 test files there are being used. I changed the jam-file there, but I don't use Boost.Build myself, so can someone here confirm that the changes work. You can check out the exact changes with Change-set 47123 at <http://svn.boost.org/trac/boost/changeset/47123>. -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com

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more filesystem questions :)
by Emil Dotchevski 05 Jul '08

05 Jul '08

Without boost::filesystem, it is quite common for programs to take a path as user input and pass it to the OS without caring much if it's valid native path or not. If it isn't, the OS function call will fail. I don't think that this common use case would change much if it's ported to use boost::filesystem. This leads to my questions: if I can store any string into a path object, how are the semantics of boost::path different from the semantics of a string? What is the path type invariant? Does it give me any guarantees about the stored string? Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode

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Inspection report and non-ASCII characters
by John Maddock 05 Jul '08

05 Jul '08

Would it be possible for the inspection report to print out the line containing the non-ASCII characters? There are a few files that are being flagged up, where I just can't find anything wrong with them :-( Thanks, John.

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