December 2007 - Boost-users - lists.preview.boost.org

[accumulators] Compilation Problem
by Olivier Tournaire 12 Dec '07

12 Dec '07

Hi all, I am trying to use boost::accumulators lib and I would appreciate some help. I do not know how to use the tag::density. How do I use : accumulator_set<double, tag::density > angular_acc; and set density::cache_size density::num_bins To have for example 10 subdivisions between -pi and pi ? Then, how do I extract the results of the accumulation ? Regards Olivier -- Le temps des cerises reviendra. Dans l'immédiat, c'est le temps des noyaux. Courage.

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Bug in filesystem library? (wpath, wdirectory_iterator)
by Olivier Delande 12 Dec '07

12 Dec '07

I noticed something which looks pretty much like a bug in the filesystem library. Both version 1.34.1 and CVS are affected under Linux. I do not know about other versions/platforms. If I compile and run the following code ----------------------------------- #include <boost/filesystem.hpp> #include <iostream> int main(int argc, char *argv[]) { boost::filesystem::wpath p(L"/"); boost::filesystem::wdirectory_iterator i(p); return 0; } ----------------------------------- then I get an exception: ----------------------------------- terminate called after throwing an instance of 'boost::filesystem::basic_filesystem_error<boost::filesystem::basic_path<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, boost::filesystem::wpath_traits> >' what(): boost::filesystem::wpath::to_external conversion error: Invalid argument Aborted ----------------------------------- However, the following alternate version (which uses char instead of wchar_t) works: ----------------------------------- #include <boost/filesystem.hpp> #include <iostream> int main(int argc, char *argv[]) { boost::filesystem::path p("/"); boost::filesystem::directory_iterator i(p); return 0; } ----------------------------------- Has anyone ever found a way to cope with that or filed a bug? Thanks -- Olivier

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maps and constructor
by Hicham Mouline 12 Dec '07

12 Dec '07

Hello, I am attempting to design a class: class C { std::map<double, const A> ma; std::map<double, const B> ma; . public: C(...); }; The keys in the 2 maps are always identical. So I could choose: std::map<double, const std::pair<A,B> > or std::map<double, const std::pair<A,B>* > (ps: AFAIK, using a const-ref for the pair is impossible, but possible with some boost classes) Q1: Is there a difference in memory usage, in access speed or in code readability between the top choice and bottom ones? Q2: Between the 2 bottom ones (storing the pair object in the map vs storing the ptr) Q3: For users of class C, what sort of constructors should I offer? C::C(const std::map<double, const std::pair<A,B>* >& ) Or, should I allow adding elements to the map after the object being constructed? C::add(double, const A&, const B&) Are there better ways with boost classes? Thank you for boost and your time, Rds,

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Re: [Boost-users] [File System] unresolved symbol unsigned int boost::filesystem::detail::not_found_error after upgrade from boost 1_34_0 to 1_34_1
by Bill McLean 12 Dec '07

12 Dec '07

Oops. The below is no longer a problem. In order to resolve the problem, I reinstalled boost from Boost Consulting and had it install all the libraries. One I dropped my belief that I had done everything correctly and I redid the installation was I able to resolve the problem. Bill McLean -----Original Message----- From: Bill McLean [mailto:bill@mcleansoftware.com] Sent: Wednesday, December 12, 2007 11:55 AM To: 'boost-users(a)lists.boost.org' Subject: [File System] unresolved symbol unsigned int boost::filesystem::detail::not_found_error after upgrade from boost 1_34_0 to 1_34_1 After upgrading from Boost 1.34.0 to 1.34.1, I get the Visual Studio 2005 error and building my project: Error 805 error LNK2001: unresolved external symbol "unsigned int boost::filesystem::detail::not_found_error" (?not_found_error@detail@filesystem@boost@@3IA) FolderProcessing.obj I have isolated the error to the declaration: boost::filesystem::directory_iterator it(folder); Using boost 1_34_0 the above declaration worked and with 1_34_0 it fails. I have copied the installed boost 1.34.1 (from Boost Consulting) C:\Program Files\boost\boost_1_34_1 to my project folder C:\projects\ardev\CurrentDev\ExternalLibs\boost where I copied the new boost 1_34_1 release over top the 1_34_0 release. All references to 1_34_0 libraries have been changed to 1_34_1 libraries: ... boost_signals-vc80-mt-gd-1_34_1.lib boost_thread-vc80-mt-gd-1_34_1.lib boost_filesystem-vc80-mt-gd-1_34_1.lib

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Re: [Boost-users] build boost.python tutorial "hello world" without bjam
by damny＠web.de 12 Dec '07

12 Dec '07

hi. in result of your post, i changed my original bat like this: // --- snip ----------------------------------------------------------------------------- SET DIR_MINGW=c:\development_compiler\mingw\ SET DIR_BOOST=c:\development_compiler\_boost\ SET DIR_PYTHN=c:\development_compiler\python25\ SET DIR_PRJCT=%~dp0 SET NME_PRJCT=hello SET CC=c:\development_compiler\mingw\bin\g++.exe SET LD=c:\development_compiler\mingw\bin\ld.exe SET INCL=-I%DIR_BOOST%include\boost-1_34_1 -I%DIR_PYTHN%include -I%DIR_MINGW%include SET LIBS=-L%DIR_BOOST%lib -L%DIR_PYTHN%libs -L%DIR_MINGW%lib %CC% -O0 -shared %INCL% %DIR_PRJCT%%NME_PRJCT%.cpp ^ %LIBS% %DIR_BOOST%lib\boost_python-mgw34-1_34_1.a -lpython25 ^ -o %NME_PRJCT%.pyd // --- snip ----------------------------------------------------------------------------- in association with "boost_python-mgw34-1_34_1.dll" the "hello world" demo works *YeahHa*. but is there a possibility to avoid the necessity of using the dll? :o) daniel > -----Ursprüngliche Nachricht----- > Von: boost-users(a)lists.boost.org > Gesendet: 05.12.07 15:37:35 > An: boost-users(a)lists.boost.org > Betreff: Re: [Boost-users] build boost.python tutorial "hello world" without bjam > > damny(a)web.de wrote: > > > thanks for your replay, > > > > but nothing happens when i reorder the compile command. > > like before, the same error messages appear. > > > > are there any other ideas? i'm at a loss. > > OK, the only other thing I can offer is the output if the commands invoked > by bjam when building this tutorial example: > > ---%<--- > C:\src\boost\BOOST_~3\libs\python\example\tutorial>bjam -d+2 --toolset=gcc > Building Boost.Regex with the optional Unicode/ICU support disabled. > Please refer to the Boost.Regex documentation for more information > (don't panic: this is a strictly optional feature). > gcc.compile.c++ bin\gcc-mingw-3.4.2\debug\hello.o > > "g++" -ftemplate-depth-128 -O0 -fno-inline -Wall -g > -I"..\..\..\.." -I"C:\Python25\Include" -c -o > "bin\gcc-mingw-3.4.2\debug\hello.o" "hello.cpp" > > gcc.link.dll bin\gcc-mingw-3.4.2\debug\hello.a > bin\gcc-mingw-3.4.2\debug\hello.pyd > > "g++" -L"C:\Python25\libs" -Wl,-R -Wl,"C:\Python25" -Wl,-R > -Wl,"C:\Python25\libs" "-Wl,--out-implib,bin\gcc-mingw-3.4.2\debug\hello.a" > -o "bin\gcc-mingw-3.4 > .2\debug\hello.pyd" -shared -Wl,--start-group > "bin\gcc-mingw-3.4.2\debug\hello.o" > "..\..\..\..\bin.v2\libs\python\build\gcc-mingw-3.4.2\debug\boost_python-mgw3 > 4-d-1_34_1.a" -lpython25 -Wl,--end-group -g > > Creating library file: bin\gcc-mingw-3.4.2\debug\hello.a > --->%--- > > Here you can see the exact command used to compile and link the tutorial > example in boost 1.34.1. > > Maybe this gets you started. > > HTH, Markus > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > _____________________________________________________________________ Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! http://smartsurfer.web.de/?mc=100071&distributionid=000000000066

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identification of thread
by Igor 12 Dec '07

12 Dec '07

Hi, Could you please explain for beginner in thread-related business, how the thread is identified from itself? Can the program, that it the given thread, obtain its own number or an index of itself? I assume that there should be some enumeration such as numbering the main program by 0, next child thread by 1, etc.? And, in particular, is this number available from boost thread library? THanks in advance Igor

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iterator_range compile problem
by Olivier Tournaire 12 Dec '07

12 Dec '07

Hi all, I am having problem while compiling this code : typedef std::pair<double,double> t_pair; typedef std::vector< t_pair > t_vector; typedef t_vector::iterator t_iterator; typedef iterator_range< t_iterator > histogram_type; // syntax error : missing ';' before '<' Do you have any issue ? Regards Olivier -- Le temps des cerises reviendra. Dans l'immédiat, c'est le temps des noyaux. Courage.

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boost::random issue with icc on Windows
by Geoff Wedig 12 Dec '07

12 Dec '07

Hello, We are experiencing a problem with boost::random using icc on Windows under optimization. If we compile with the -O1 option, we get correct behavior. Compiling with -O2 or no -O option gives us a string of zeros. We have compiled a small test case which shows this problem: #include "boost/function.hpp" #include "boost/random.hpp" #include <iostream> #include <iomanip> using namespace std; typedef boost::lagged_fibonacci607 RGType; typedef boost::uniform_smallint<> DistType; typedef boost::variate_generator<RGType, DistType> GeneratorType; int main() { DistType mainDist(0,10000); RGType mainEng((boost::uint32_t) 12); GeneratorType mainGen(mainEng, mainDist); for(size_t i = 0; i != 10; ++i) cout << mainGen() << ", "; cout << endl; } To date, I've done a lot of hunting trying different compiler options to attack this problem. The compiler option which seems to have the most consistent effect, in that adding it makes the program work, whereas removing it makes it not is -Qunroll0. I am guessing something in the optimization is causing the generator not to initialize properly, but I do not, at present, know how to solve it. Has anyone else seen this, or have any ideas what might be going wrong? I appreciate any ideas. Thanks, Geoff Wedig Digital Domain

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Constant floats
by Robert Dailey 12 Dec '07

12 Dec '07

Is there a way I can define constant floats within class scope like you can with integral values? I was hoping boost could help in this area. For example: struct default_alpha { static const float value = 1.0f; }; The above is not legal, of course. Anyone? Thanks.

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[File System] unresolved symbol unsigned int boost::filesystem::detail::not_found_error after upgrade from boost 1_34_0 to 1_34_1
by Bill McLean 12 Dec '07

12 Dec '07

After upgrading from Boost 1.34.0 to 1.34.1, I get the Visual Studio 2005 error and building my project: Error 805 error LNK2001: unresolved external symbol "unsigned int boost::filesystem::detail::not_found_error" (?not_found_error@detail@filesystem@boost@@3IA) FolderProcessing.obj I have isolated the error to the declaration: boost::filesystem::directory_iterator it(folder); Using boost 1_34_0 the above declaration worked and with 1_34_0 it fails. I have copied the installed boost 1.34.1 (from Boost Consulting) C:\Program Files\boost\boost_1_34_1 to my project folder C:\projects\ardev\CurrentDev\ExternalLibs\boost where I copied the new boost 1_34_1 release over top the 1_34_0 release. All references to 1_34_0 libraries have been changed to 1_34_1 libraries: ... boost_signals-vc80-mt-gd-1_34_1.lib boost_thread-vc80-mt-gd-1_34_1.lib boost_filesystem-vc80-mt-gd-1_34_1.lib

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