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[Random] Change in normal_distribution behavior between Boost 1.49 and Boost 1.56
by Jonathan Jones 17 Jun '15

17 Jun '15

Hi folks, Given the same set of inputs, this program is producing different answers in Boost 1.56 as compared to Boost 1.49: #include <boost/random/mersenne_twister.hpp> #include <boost/random/normal_distribution.hpp> int main() { boost::normal_distribution<double> dist(0.0, 1.0); boost::mt19937 gen(0); for (int ii=1; ii <= 5; ++ii) { printf("%2d) %g\n", ii, dist(gen)); } } I've isolated this to a change in the implementation of normal_distribution between these two versions (mt19937 is producing the same sequence of numbers with the same starting seed). My question is, is there any guarantee that this distribution is going to produce the same answers across different versions of Boost, given the same starting seed (zero in this case)? Thanks, Jon

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Building boost with clang on windows
by Ernest Zaslavsky 16 Jun '15

16 Jun '15

Any progress with it? Last time I tried to build boost 1.58 with clang 3.6.1 it didn't do it out of the box [Read More]<http://feeds.feedburner.com/~r/sizmek-blog/~6/1> [http://www.sizmek.com/Sizmek.png]<http://www.sizmek.com/>

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Re: [Boost-users] [Serialization] Non-default constructor and template class
by Mccall, Kurt E. (JSC-EG411) 15 Jun '15

15 Jun '15

> you should be able to simply define a private default constructor, if boost::serialization::acess is declared as a friend of your class. There is no need to initialize variables > that are in your serialize() function, as Boost.Serialization should set > their values after default construction. So in most cases the default constructor may be empty and > is trivial to implement, while it can not be called by any external entity (except if it is also declared „friend“). Thanks Beet, That makes it sound like overriding load_construct_data() and save_construct_data() is almost never necessary. In what cases would it be needed? Kurt

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C# application crashes due exception in exception_ptr.hpp
by Markus Pieper 15 Jun '15

15 Jun '15

Hi there, I´m new to boost so this might be a silly question. We have a simulation that is written in C++ and compiled as a static lib. It uses a few boost (v1.56) functions like thread. My job is to create a WPF GUI, that uses this lib. For that, I created a C++ CLR DLL which interacts as a wrapper between .NET GUI and the unmanaged libs. Everything works fine but closing my program results in a crash. This crash is described here: http://stackoverflow.com/questions/8144630/mixed-mode-c- cli-dll-throws-exception-on-exit And someone replied, that the reason for this lies in the exception_ptr.hpp beacause a "static exception_ptr ep" is being used instead of "exception_ptr ep". When I delete the static attribute, my program ends normally without the crash. My understanding of C++ is not that big, so I can´t say why it crashes here. But the boost programmers have a reason to do so. I also followed These advices (http://thread.gmane.org/gmane.comp.lib.boost.user/44515) but with no further luck. Best regards, Markus

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c++14 support
by Freddy Martinez Garcia 14 Jun '15

14 Jun '15

hi guys, I’m new with boost... can anyone tell me if boost library can be compiled with c++14 support ?? in that case, how can I do that ?? best regards ============================================= "El tamaño de tus logros depende del tamaño de tus metas." C++ and Qt Senior Developer Lic. Computer Science Buenos Aires, Argentina

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How do I use the output of -showme:link and -showme:compile to customize my boost mpi build?
by Cook, Rich 13 Jun '15

13 Jun '15

Hello, Apologies if this is redundant. I have not heard back so I thought I would try to restate my question more clearly in case it was overlooked. Hopefully I don't seem impatient, but I have a customer waiting on me and I'm not sure if I can help them. In an earlier thread, titled "Cannot build boost with MPI using Intel openMPI wrapper", Alain Miniussi suggested I execute the following commands: $/usr/local/tools/openmpi-intel-debug-1.8.4/bin/mpicxx --showme:compile $/usr/local/tools/openmpi-intel-debug-1.8.4/bin/mpicxx --showme:link I have done so and they appear to give me sane output: rcook@rzgpu2 (~ ): /usr/local/tools/openmpi-intel-debug-1.8.4/bin/mpicxx --showme:compile -I/usr/local/tools/openmpi-intel-debug-1.8.4/include/openmpi/opal/mca/hwloc/hwloc191/hwloc/include -I/usr/local/tools/openmpi-intel-debug-1.8.4/include/openmpi/opal/mca/event/libevent2021/libevent -I/usr/local/tools/openmpi-intel-debug-1.8.4/include/openmpi/opal/mca/event/libevent2021/libevent/include -I/usr/local/tools/openmpi-intel-debug-1.8.4/include -I/usr/local/tools/openmpi-intel-debug-1.8.4/include/openmpi -pthread My question is now, how do I use this output to configure boost to properly build using my Intel MPI wrappers? Currently, I'm seeing this in my output: ==============MPI Auto-configuration=============== MPI auto-detection failed: unknown wrapper compiler /usr/local/tools/openmpi-intel-debug-1.8.4/bin/mpiCC Please report this error to the Boost mailing list: http://www.boost.org<http://www.boost.org/> You will need to manually configure MPI support. MPI launcher: mpirun -np ==================================================== Thanks so much for any help. -- ✐Richard Cook ✇ Lawrence Livermore National Laboratory Bldg-453 Rm-4024, Mail Stop L-557 7000 East Avenue, Livermore, CA, 94550, USA ☎ (office) (925) 423-9605 ☎ (fax) (925) 423-6961 --- Information Management & Graphics Grp., Services & Development Div., Integrated Computing & Communications Dept. (opinions expressed herein are mine and not those of LLNL)

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future: unreferenced formal parameter 'lk'
by forumer＠smartmobili.com 13 Jun '15

13 Jun '15

Hello, I am using boost 1.58 and when I compile my project I have this annoying warning: Warning 4 warning C4100: 'lk' : unreferenced formal parameter C:\proj\boost\include\boost\thread\future.hpp When I look at source code I can see that lk is not used: future_state::state get_state(boost::unique_lock<boost::mutex>& lk) const { if(!done) { return future_state::waiting; } else { return future_state::ready; } } It would be great to fix it for the next release. Thanks

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Interprocess support for Pipe
by Lloyd 12 Jun '15

12 Jun '15

Hi, Does boost interprocess support "pipe" like operations. That is if process A writes something and when process B reads it, the memory content should be reset. If I use shared memory, it complicates things. Thanks, Lloyd

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Boost Random Numbers: Normal Distribution
by Hadidi, Lars 11 Jun '15

11 Jun '15

Hello, I tried to find out which method is used by the boost library to transform random numbers from a random number engine to the Gaussian Distribution. There are the Box-Muller-Method, Marsaglia's Polar Method and Ziggurat's algorithm out there, but i could not determine which of those is actually used by boost::normal_distribution<double>? I'd like to know which method is employed here. Thanks for reply in advance, sincerely, Lars

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Re: [Boost-users] "Re: Cannot build boost with MPI using Intel openMPI wrapper"
by Cook, Rich 11 Jun '15

11 Jun '15

I have looked over the docs at http://www.boost.org/doc/libs/1_55_0/doc/html/mpi/getting_started.html#mpi.… and I just don't really understand what the <find-shared-library> option does in this: using mpi : : <find-shared-library>lammpio <find-shared-library>lammpi++ <find-shared-library>mpi <find-shared-library>lam <find-shared-library>dl ; I don't understand how this maps into the instructions here: http://www.boost.org/build/doc/html/bbv2/reference/tools.html > Date: Wed, 10 Jun 2015 18:42:17 +0000 > From: "Cook, Rich" <cook47(a)llnl.gov> > To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> > Subject: Re: [Boost-users] Boost-users Digest, Vol 4163, Issue 2 > Message-ID: <4F5E3BDC-CDF6-442E-BB02-054510A61C61(a)llnl.gov> > Content-Type: text/plain; charset="utf-8" > >> >> Hi, here is the output of those commands, modified to reflect the actual tool I told boost to use, which is mpiCC, not mpicxx. What should I do with this output, and why does boost not accept it? Thanks! >> >> rcook@rzgpu2 (~ ): /usr/local/tools/openmpi-intel-debug-1.8.4/bin/mpicxx --showme:compile >> -I/usr/local/tools/openmpi-intel-debug-1.8.4/include/openmpi/opal/mca/hwloc/hwloc191/hwloc/include -I/usr/local/tools/openmpi-intel-debug-1.8.4/include/openmpi/opal/mca/event/libevent2021/libevent -I/usr/local/tools/openmpi-intel-debug-1.8.4/include/openmpi/opal/mca/event/libevent2021/libevent/include -I/usr/local/tools/openmpi-intel-debug-1.8.4/include -I/usr/local/tools/openmpi-intel-debug-1.8.4/include/openmpi -pthread >> >> rcook@rzgpu2 (~ ): /usr/local/tools/openmpi-intel-debug-1.8.4/bin/mpicxx --showme:link >> -pthread -Wl,-rpath -Wl,/usr/local/tools/openmpi-intel-debug-1.8.4/lib -Wl,--enable-new-dtags -L/usr/local/tools/openmpi-intel-debug-1.8.4/lib -lmpi >> >> >> >> Subject: Re: [Boost-users] Cannot build boost with MPI using Intel openMPI wrapper >> From: Alain Miniussi (alain.miniussi_at_[hidden]) >> Date: 2015-06-10 10:07:41 >> >> * Next message: Hadidi, Lars: "[Boost-users] Boost Random Numbers: Normal Distribution"<http://lists.boost.org/boost-users/2015/06/84409.php> >> * Previous message: Boris Sch??ling: "Re: [Boost-users] Cannot build boost with MPI using Intel openMPI wrapper"<http://lists.boost.org/boost-users/2015/06/84407.php> >> * In reply to: Boris Sch??ling: "Re: [Boost-users] Cannot build boost with MPI using Intel openMPI wrapper"<http://lists.boost.org/boost-users/2015/06/84407.php> >> >> ________________________________ >> >> What is the result of: >> $/usr/local/tools/openmpi-intel-debug-1.8.4/bin/mpicxx --showme:compile >> $/usr/local/tools/openmpi-intel-debug-1.8.4/bin/mpicxx --showme:link >> ? >> >> >> On 10/06/2015 11:08, Boris Sch?ling wrote: >>> On Wed, 10 Jun 2015 02:37:26 +0200, Cook, Rich <cook47_at_[hidden]> wrote: >>> >>>> Hello, I'm seeing this in my build output. I'm hoping someone can >>>> help me find out what the actual problem is. Thanks for any assistance. >>>> >>>> ===============MPI Auto-configuration=============== >>>> MPI auto-detection failed: unknown wrapper compiler >>>> /usr/local/tools/openmpi-intel-debug-1.8.4/bin/mpiCC >>>> Please report this error to the Boost mailing list: http://www.boost.org<http://www.boost.org/> >>>> You will need to manually configure MPI support. >>>> MPI launcher: mpirun -np >>>> ==================================================== >>>> > > -- > ?Richard Cook > ? Lawrence Livermore National Laboratory > Bldg-453 Rm-4024, Mail Stop L-557 > 7000 East Avenue, Livermore, CA, 94550, USA > ? (office) (925) 423-9605 > ? (fax) (925) 423-6961 > --- > Information Management & Graphics Grp., Services & Development Div., Integrated Computing & Communications Dept. > (opinions expressed herein are mine and not those of LLNL) > > > > > ------------------------------ > > Message: 2 > Date: Wed, 10 Jun 2015 16:56:04 -0700 > From: Nicholas Yue <yue.nicholas(a)gmail.com> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Modify an asio echo server so that it does > not send message back to client > Message-ID: <5578CE94.9000304(a)gmail.com> > Content-Type: text/plain; charset=windows-1252; format=flowed > > > > On 2015-06-09 5:14 PM, Gavin Lambert wrote: >> >> You need to pass the bytes_transferred to process as well, so that it >> knows how much data was actually read and therefore how much of data_ >> is actually valid. Don't forget that this may be less than max_length >> and may be different from what the client actually sent (ie. data sent >> in one chunk may be received in multiple chunks). > Thanks Gavin. > > I now have a process() method with the bytes_transferred parameter. > > Newbie question, how do I know the last chunk has been sent, so > that I can now process the data (which will be binary) ? > > Is there some simple example which illustrate this I can refer to ? > > Cheers > Nicholas Yue > > > > ------------------------------ > > Message: 3 > Date: Thu, 11 Jun 2015 12:16:06 +1200 > From: Gavin Lambert <gavinl(a)compacsort.com> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Modify an asio echo server so that it does > not send message back to client > Message-ID: <mlak07$9ns$1(a)ger.gmane.org> > Content-Type: text/plain; charset=windows-1252; format=flowed > > On 11/06/2015 11:56, Nicholas Yue wrote: >> I now have a process() method with the bytes_transferred parameter. >> >> Newbie question, how do I know the last chunk has been sent, so >> that I can now process the data (which will be binary) ? >> >> Is there some simple example which illustrate this I can refer to ? > > There isn't any inherent way to know. TCP is a stream protocol -- you > just receive a continuous stream of bytes with no demarcation of any kind. > > You will need to define something at the application layer of the > protocol to decide when a logical unit is complete, typically either by > inserting some delimiter that you know can never occur mid-message or by > sending the length of the following data early on. > > > Note that ASIO does provide some helper methods for these scenarios -- > instead of using async_read_some, which just returns data as it becomes > available, you can use asio::async_read (which you can tell to not > return until it has read a specific number of bytes) or > asio::async_read_until (read until a specific delimiter). (It's tricky, > though not impossible, to do a combination of the two -- but it's > something you should avoid if you have a choice.) > > So for a line-based protocol you could async_read_until a CRLF (or just > LF, depending on the other end), or for a binary protocol that sends a > 4-byte length followed by a payload you could async_read 4 bytes to get > the length, then async_read that many bytes to get the payload. > > > > > ------------------------------ > > Message: 4 > Date: Wed, 10 Jun 2015 23:00:42 -0400 > From: Tim Song <t.canens.cpp(a)gmail.com> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Boost Random Numbers: Normal Distribution > Message-ID: > <CAPQZVxs3YoUgkzmqCp=K=4DtjJ3x_ugbbiKm+uKE0q9rvBgSdw(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > On Wed, Jun 10, 2015 at 11:59 AM, Hadidi, Lars < > lhadidi(a)students.uni-mainz.de> wrote: >> >> I'd like to know which method is employed here. >> > Have you tried reading the implementation ( > http://www.boost.org/doc/libs/1_58_0/boost/random/normal_distribution.hpp)? > > Hint: The first comment after the includes is > > // tables for the ziggurat algorithm > -------------- next part -------------- > HTML attachment scrubbed and removed > > ------------------------------ > > Message: 5 > Date: Thu, 11 Jun 2015 08:06:04 +0200 > From: Oswin Krause <Oswin.Krause(a)ruhr-uni-bochum.de> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Boost Random Numbers: Normal Distribution > Message-ID: > <ea13f1e81a2759ab472963b5e8e07770(a)mpx2.rz.ruhr-uni-bochum.de> > Content-Type: text/plain; charset=UTF-8; format=flowed > > Recently, it changed to Ziggurat's method. > > On 2015-06-10 17:59, Hadidi, Lars wrote: >> Hello, >> >> I tried to find out which method is used by the boost library to >> transform random numbers from a random number engine to the Gaussian >> Distribution. >> >> There are the Box-Muller-Method, Marsaglia's Polar Method and >> Ziggurat's algorithm out there, but i could not determine which of >> those is actually used by >> >> boost::normal_distribution<double>? >> >> I'd like to know which method is employed here. >> >> Thanks for reply in advance, >> >> sincerely, >> >> Lars >> >> >> _______________________________________________ >> Boost-users mailing list >> Boost-users(a)lists.boost.org >> http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > ------------------------------ > > End of Boost-users Digest, Vol 4164, Issue 1 > ******************************************** -- ✐Richard Cook ✇ Lawrence Livermore National Laboratory Bldg-453 Rm-4024, Mail Stop L-557 7000 East Avenue, Livermore, CA, 94550, USA ☎ (office) (925) 423-9605 ☎ (fax) (925) 423-6961 --- Information Management & Graphics Grp., Services & Development Div., Integrated Computing & Communications Dept. (opinions expressed herein are mine and not those of LLNL)

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