August 2011 - Boost-users - lists.preview.boost.org

Re: [Boost-users] trouble with boost/random/poisson_distribution and large lambda
by Michael King 30 Aug '11

30 Aug '11

Thanks, I did realize that... much nicer api too. -mike On Aug 30, 2011 1:21 PM, "Steven Watanabe" <watanabesj(a)gmail.com> wrote: AMDG On 06/22/2011 03:49 PM, Michael King wrote: > Hello, > > I am new to the boost mailing list, so I ... poisson_distribution has been completely reimplemented in 1.47. This problem appears to be gone. I tested your code with MSVC 10 and the current trunk (r74137). > For example: > > <snip> > In Christ, Steven Watanabe

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trouble with boost/random/poisson_distribution and large lambda
by Michael King 30 Aug '11

30 Aug '11

Hello, I am new to the boost mailing list, so I apologize before hand if this is not the appropriate forum for this question. I have been using boost/random recently and have encountered what appears to be a problem with poisson variate generators with large lambda values. The random values can't seem to get much higher than 800 regardless of what value lambda is. For example: #include<iostream> #include<iterator> #include<vector> #include<algorithm> #include<boost/random/poisson_distribution.hpp> #include<boost/random/variate_generator.hpp> #include<boost/random/mersenne_twister.hpp> using namespace boost; using namespace std; int main() { mt19937 gen; double lambda = 1000.; poisson_distribution<int, double> pois(lambda); variate_generator<mt19937&, poisson_distribution<int, double> > rpois(gen, pois); // generate 10 random poisson variables vector<double> sample(10); generate(sample.begin(), sample.end(), rpois); cout << "Simulating from Poisson Random Variable with lambda=" << lambda << endl; cout << "\nSample: "; copy(sample.begin(), sample.end(), ostream_iterator<int>(cout, " ")); cout << "\n\nShouldn't the numbers be a little closer to 1,000?" << endl; return 0; } Thanks, Mike

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Reg : Boost Error - any.hpp
by Vijay 30 Aug '11

30 Aug '11

Hi, We are using boost version 1.31.0 in our C++ code. Our OS is HP-UX 11.31 Itanium. We use aCC compiler. While compiling my code, I'm getting the below error. Can any one help me to fix this issue ? "/opt/app/q1app2c4/boost-1.31.0/boost/any.hpp", line 125: error #2070: incomplete type is not allowed ValueType held; ^ detected during: instantiation of class "boost::any::holder<ValueType> [with ValueType=Fcif]" at line 32 instantiation of "boost::any::any(const ValueType &) [with ValueType=Fcif]" at line 35 of "/opt/app/q1app2c4/src/share/incl/Fcif.h" Cheers, Vijay....(V2K) E-mail to : v2k.sweet(a)gmail.com Catch me @ 9962003328, 7871181610 Blackberry PIN : 259943F3 "Life is just one grand sweet song, so start the music."

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asio - POSIX.4 Message Queues
by Hite, Christopher 30 Aug '11

30 Aug '11

Any chance of getting support for Posix Message Queues? http://www.users.pjwstk.edu.pl/~jms/qnx/help/watcom/clibref/mq_overview.html How do I make asio listen to a foreign file descriptor to do basic reactor style code? Is this still the way to do things with the posix queues? socket.async_read_some(null_buffers(), read_handler); On a unrelated note: The search feature on boost.org is broken by google. Could we hook it up to bing or yahoo if they don't fix it? Chris

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[units]
by Thomas Taylor 30 Aug '11

30 Aug '11

Could you please review the following patch for inclusion in boost::units? *WHY*: Obviously this only defines a conversion for boost::units::one to a numerical 1. When trying to convert at runtime (aiming for a runtime/dynamic unit instead of the compiletime/static unit provided) I use the following function: template <typename U1, typename U2> double unit_dispatch2t(U1 const& u1, U2 const& u2) { return bu::conversion_factor(u1,u2); } where U1 and U2 are boost::unit::unit derivatives. Without a conversion operator the compiler chickens out by claiming to not be able to convert boost::units::one to (in my case) double. The added conversion operator allows successfull compilation, thus allowing actual runtime units (my application needs to handle calculations where some units are known at compiletime and some only at runtime (e.g. the user wants the calculation to be done in meters or millimeters)). HTH, Thomas --- one.hpp 2011-08-30 09:50:13.000000000 +0200 +++ one2.hpp 2011-08-30 09:50:07.000000000 +0200 @@ -19,3 +19,3 @@ -struct one { one() {} }; +struct one { one() {} operator int() { return 1; } };

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[wave] Tracing a macro in a preprocessor directive
by Edward Diener 30 Aug '11

30 Aug '11

I was trying to trace the output of a macro within a preprocessor directive in a file using the Wave trace facility. The directive is: #elif BOOST_PP_ITERATION_FLAGS() == 1 so I specified: #pragma wave trace(enable) #elif BOOST_PP_ITERATION_FLAGS() == 1 #pragma wave trace(disable) But wave's trace showed me an empty file where the macro output ( -tsomefile ) should have been. Is there a way to capture the output of the BOOST_PP_ITERATION_FLAGS() macro at the point where the #elif is occuring using Wave's trace facility ?

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Asio does not compile
by Alessandro Candini 30 Aug '11

30 Aug '11

My code (simplyfication of this: http://www.boost.org/doc/libs/1_47_0/doc/html/boost_asio/tutorial/tuttimer1…): #include <iostream> #include </usr/local/include/boost/asio.hpp> // Boost version 1.47.0 int main() { return 0; } Compilation command: g++ -Wall -o timer1 timer1.cpp Error: /tmp/ccGUgnoD.o: In function `__static_initialization_and_destruction_0(int, int)': timer1.cpp:(.text+0x52): undefined reference to `boost::system::generic_category()' timer1.cpp:(.text+0x5e): undefined reference to `boost::system::generic_category()' timer1.cpp:(.text+0x6a): undefined reference to `boost::system::system_category()' /tmp/ccGUgnoD.o: In function `boost::asio::error::get_system_category()': timer1.cpp:(.text._ZN5boost4asio5error19get_system_categoryEv[boost::asio::error::get_system_category()]+0x5): undefined reference to `boost::system::system_category()' /tmp/ccGUgnoD.o: In function `boost::asio::detail::posix_tss_ptr_create(unsigned int&)': timer1.cpp:(.text._ZN5boost4asio6detail20posix_tss_ptr_createERj[boost::asio::detail::posix_tss_ptr_create(unsigned int&)]+0x19): undefined reference to `pthread_key_create' /tmp/ccGUgnoD.o: In function `boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service>::context>::~posix_tss_ptr()': timer1.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceEE7contextEED2Ev[_ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceEE7contextEED5Ev]+0x15): undefined reference to `pthread_key_delete' /tmp/ccGUgnoD.o: In function `boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::strand_service::strand_impl>::context>::~posix_tss_ptr()': timer1.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_14strand_service11strand_implEE7contextEED2Ev[_ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_14strand_service11strand_implEE7contextEED5Ev]+0x15): undefined reference to `pthread_key_delete' collect2: ld returned 1 exit status make: *** [all] Error 1 Any ideas? Thanks in advance. -- Alessandro Candini MEEO S.r.l. Via Saragat 9 I-44122 Ferrara, Italy Tel: +39 0532 1861501 Fax: +39 0532 1861637 http://www.meeo.it ======================================== "ATTENZIONE:le informazioni contenute in questo messaggio sono da considerarsi confidenziali ed il loro utilizzo è riservato unicamente al destinatario sopra indicato. Chi dovesse ricevere questo messaggio per errore è tenuto ad informare il mittente ed a rimuoverlo definitivamente da ogni supporto elettronico o cartaceo." "WARNING:This message contains confidential and/or proprietary information which may be subject to privilege or immunity and which is intended for use of its addressee only. Should you receive this message in error, you are kindly requested to inform the sender and to definitively remove it from any paper or electronic format."

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[Signals\Signals2] Move semantics
by Szymon Gatner 29 Aug '11

29 Aug '11

Hi, Any plans to do signals\signals2 movable? Just getting used to move things with great boost.move + boost.container libraries and being able to do same with signal-related code would be really nice as now the only way to deal with that is to keep signals on the heap which I find rather awkward. Cheers, Simon

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why aren't I getting multithreaded versions of the libraries that need to be built?
by Ted Byers 29 Aug '11

29 Aug '11

This is in cygwin, using gcc. initially I used the following (I don't use python and don't have MPI, but wanted everything else): $ ./bootstrap.sh --with-libraries=chrono,date_time,exception,filesystem,graph,graph_parallel, iostreams,math,program_options,random,regex,serialization,signals,system,tes t,thread,wave ./b2 install I then tried building QuantLib, which makes extensive use of boost, including the test framework. But it failed because it tried linking to a multihtreaded build of the test frameqwork. I therefore tried the following, assuming that like make, it would just build and install those targets that had not been built the first time. $ ./bootstrap.sh --with-libraries=chrono,date_time,exception,filesystem,graph,graph_parallel, iostreams,math,program_options,random,regex,serialization,signals,system,tes t,thread,wave link=static link=shared threading=single threading=multi ./b2 install Unfortunately, it did not create the multithreaded build of the testframework that QuantLib requires. What did I miss that is preventing me from getting the multihtreaded builds of the required libraries? Thanks Ted

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boost-style yaml parser
by Tim Blechmann 29 Aug '11

29 Aug '11

hi all, i wonder, does anyone have a boost-style parser for yaml? boost.propertytree lists yaml as one of the future parsers, has there been some progress on that? thanks, tim

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