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

boost-users [shared_array] comparing the value.
by chun ping wang 25 Oct '07

25 Oct '07

Hi I notice boost shared_array compares the pointer address not the pointer themselves. What would be the best way to compare the actual value of boost shared_array. 1.) shared_array<T> a; shared_array<T> b; 1.) return (a.len == b.len && (memcmp(a, b, len) == 0)); or 2.) if (a.len != b.len) return false; for (ptrdiff_t i = 0; i != a.len; ++i) if(a[i] != b[i]) return false; One that works ALL the times.

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Building boost::system
by Simon Pickles 25 Oct '07

25 Oct '07

Hi, Since the new update of boost::asio, I need to build boost::system. I built it using bjam in the boost/system/build directory, and it built: boost_system_vc80-gd-1_34_1.lib but my compiler needs: libboost_system-vc80-mt-gd-1_34_1.lib I'm not sure what the difference between the boost and libboost version, but I know the mt is multithreaded.... Can anyone advise? Thanks Si

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boost-1_34_1 in program_options getting compiling error : parse error before >
by Salles, Joaquim Campos 25 Oct '07

25 Oct '07

Hello, I'm using boost.1.34 and when I try to compile I get the following error: /usr/local/include/boost-1_34_1/boost/program_options/parsers.hpp:156: parse error before `>' I also try: ./configure --with-libraries=program_options Make And get the some error. What is my mistake? Thanks, Joaquim P.S. About g++ g++ -v Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110)

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Boost Problem
by question boost 25 Oct '07

25 Oct '07

Hi, my program makes use of Boost(Code Blocks). The arrangement of my files is the following: 1 in the directory of the source files of my program there is the directory "boost" containing the following directories: "filesystem", "config", "iterator","range","detail", "mpl", "preprocessor", "tools" and the file boost-build.jam. 2 The file that makes use of boost in my project contains the following lines: #include <string> using namespace std; #include "boost\filesystem\path.hpp" #include "boost\filesystem\operations.hpp" using namespace boost::filesystem; At compilation I get the message :"boost/preprocessor/config/config.hpp" no such file or directory and several other similar messages about other files of the same directory and about other files of the "mpl" directory. What goes wrong? Thank You David _________________________________________________________________ Découvrez le blog Messenger Le Meilleur du Web : toutes les vidéos qui buzzent le plus sur Internet ! http://meilleurduweb.spaces.live.com/

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Thread Group fails to run
by Apostolos Apostolidis 25 Oct '07

25 Oct '07

Hi all. I have developed some code allowing a thread group of 500 threads to run. However, as soon as the 381st thread is spawned, I get the following runtime error : terminate called after throwing an instance of 'boost::thread_resource_error' what(): boost::thread_resource_error The Boost documentation does not clarify the nature of the error, so I was wondering if anyone can help me out here. The (simple) program code follows. #include <boost/thread/mutex.hpp> #include <boost/thread/thread.hpp> #include <boost/bind.hpp> using namespace std; boost::mutex io_mutex; void foo(int i) { boost::mutex::scoped_lock lock(io_mutex); cout << i << endl; } int main(int argc, char *arvg[]) { boost::thread_group tg; for(int i = 0;i < 500;i++) tg.create_thread(boost::bind(&foo,i)); tg.join_all(); }

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Using mpl::remove with template paramter
by spider tong 25 Oct '07

25 Oct '07

Hi all, I'm trying to use mpl::remove to do some processing with a template parameter, like this template<typename T0, typename T1=null_type, ... typename Tn=null_type> struct my_class { typedef mpl::vector<T0, T1,...Tn> my_vector; typedef mpl::remove<my_vector, null_type>::type my_non_vector; //failed here }; Compiler report that my_vector is not derive from my_class<T0, T1,..Tn>. It seems that 'remove' would test the sequence at once, and my_vector still un_known yet, so it fails, is this guess right? //-------------------------------------------------------------------------- And I've tried this fusion too: teypdef vector<Class1, Class2, null_type, null_type> vec; vec v; fusion::for_each<v, print>; it seems that it iterate 4 times, not 2, even size(vec) return 2. It seems only evaluate will skip null_type, iterate will go through all member, is my guess right? Best Regards Spider

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Re: [Boost-users] Request to know about "dynamic expression evaluation"
by Borse, Ganesh 25 Oct '07

25 Oct '07

Hi, You recommended checking the "expression templates". However, expression templates (xpressive) provides the means of parsing the input expressions in to tokens. It does not have the support for evaluating these expressions. --- please correct me if I'm wrong. Thanks, Ganesh > _____________________________________________ > From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org <mailto:boost-users-bounces@lists.boost.org> ] On Behalf Of boost-users-request(a)lists.boost.org > Sent: 24 October 2007 02:29 > To: boost-users(a)lists.boost.org > Subject: Boost-users Digest, Vol 1428, Issue 3 > > Send Boost-users mailing list submissions to > boost-users(a)lists.boost.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.boost.org/mailman/listinfo.cgi/boost-users <http://lists.boost.org/mailman/listinfo.cgi/boost-users> > or, via email, send a message with subject or body 'help' to > boost-users-request(a)lists.boost.org > > You can reach the person managing the list at > boost-users-owner(a)lists.boost.org > > When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." > > > Today's Topics: > > 1. Re: Request to know about "dynamic expression evaluation" > (Robert Ramey) > 2. seeding a boost::random number generator...? (Graham Reitz) > 3. Thread Library Problem (Andres Herrera) > 4. boost::serialization Is there any way to get rid of compiler > warnings(C4103, ...) on VC++ 2005? (Oleg Udovenko) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 23 Oct 2007 09:15:17 -0700 > From: "Robert Ramey" <ramey(a)rrsd.com> > Subject: Re: [Boost-users] Request to know about "dynamic expression > evaluation" > To: boost-users(a)lists.boost.org > Message-ID: <ffl6mi$25v$1(a)ger.gmane.org> > Content-Type: text/plain; charset="iso-8859-1" > > Request to know about "dynamic expression evaluation"Look for "expression templates" > > Robert Ramey > "Borse, Ganesh" <ganesh.borse(a)credit-suisse.com> wrote in message news:F444CAE5E62A714C9F45AA292785BED327C3BE87@esng11p33001.sg.csfb.com <news:F444CAE5E62A714C9F45AA292785BED327C3BE87@esng11p33001.sg.csfb.com> ... > Hi, > I would like to perform the dynamic expression evaluation in my c++ application. > The dynamic expressions are like the SQL queries. > Since the expressions could be nested & hence the parsing & evaluation of such expressions is reducing the performance of my application. > > May I please know, whether BOOST provides a support for such dynamic expression evaluation in C++? > Please guide. > > Thanks in advance for the guidance. > > Regards, > Ganesh > > > ============================================================================== > Please access the attached hyperlink for an important electronic communications disclaimer: > > http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html <http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html> > ============================================================================== > > > > ------------------------------------------------------------------------------ > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users <http://lists.boost.org/mailman/listinfo.cgi/boost-users> >

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The arrangement of a boost program
by question boost 25 Oct '07

25 Oct '07

Hi, 1 My program under Code Blocks makes use of Boost. The arrangement of my files is the following: in the directory of the source files of my program there is the directory "boost" containing the following directories: "filesystem", "config", "iterator","range","detail", "mpl", "preprocessor", "tools" and the file boost-build.jam. 2 The file that makes use of boost in my project contains the following lines: #include <string> using namespace std; #include "boost\filesystem\path.hpp" #include "boost\filesystem\operations.hpp" using namespace boost::filesystem; 3 At compilation I get the message :"boost/preprocessor/config/config.hpp" no such file or directory and several other similar messages about other files of the same directory and about other files of the "mpl" directory. I've followed all the instructions here http://www.boost.org/doc/html/jam/building.html and here http://www.boost.org/doc/html/bbv2/installation.html At end of step 4 of http://www.boost.org/doc/html/bbv2/installation.html, the problem at compilation remains the same. Thank you for your response. David _________________________________________________________________ Retrouvez Windows Live Messenger sur votre mobile ! http://www.messengersurvotremobile.com

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Compiling 1.34.1 on OpenSUSE 10.3
by Ruediger Berlich 25 Oct '07

25 Oct '07

Hi there, OpenSUSE 10.3 is still delivered with Boost 1.33.1 . Hence I've downloaded Boost 1.34.1 and tried to compile it. I ran the configure script and then make. The resulting bjam immediately dies with an error: ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam /bin/sh: line 1: 2090 Speicherzugriffsfehler ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam "Speicherzugriffsfehler" means "memory access violation". This is on a Pentium-D dual-core system (4GB main memory) running with a 32-bit Linux kernel 2.6.22, g++ 4.2.1 . Does anyone have experience with this constellation ? Compilation of 1.34 worked fine on OpenSUSE 10.2 . Thanks and best regards, Ruediger

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[boost-users] anyways to flatten a stl container.
by chun ping wang 24 Oct '07

24 Oct '07

Is their some kind of method to flatten a stl container... example [[1, 4], [a,b, c], [b, [e]] ] becomes [1, 4, a, b, c, b, e]

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Question about versioning of serialization
by Fred Lupien 24 Oct '07

24 Oct '07

Hello, we are currently implementing serialization versioning using boost and I am curious to know if their is a way to support a changing class hierarchy. Let's say C derives from A for a while and then a change requires C to derive from B instead, which derives from A. Is it possible to support such a change provided we know what default values are needed for the new class? I tried and even if don't serialize anything in class C I get stream errors because I believe boost saves some base info for each class. When it tries to reload those value from a old stream, obviously it desynchronizes it because the values are not in the stream. So is their a way around this? Also is it possible to support the removal of a class. If, for exemple C derives from B which in turn derives from A and suddenly B is removed. Is their a way to deal with this without invalidating all previously saved data? Thank you for your help! -- Frédérick Martel-Lupien Étudiant en Génie Informatique Université de Sherbrooke fred.lupien(a)gmail.com

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dereferencing type-punned pointer in function_base under gcc-4.3
by Benoit Hudson 24 Oct '07

24 Oct '07

I'm trying to make sure my code compiles under gcc-4.3 before that compiler comes out. I'm currently stuck on an error it reports in boost, version 1.34.1 (which I downloaded seconds ago; error was also present in 1.34.0): In file included from ../boost/function/detail/prologue.hpp:16, from ../boost/function.hpp:22, from ../boost/iterator/transform_iterator.hpp:10, from [my code]: ../boost/function/function_base.hpp: In member function 'const std::type_info& boost::function_base::target_type() const': ../boost/function/function_base.hpp:485: error: dereferencing type-punned pointer will break strict-aliasing rules I don't understand how there's any type-punning going on at line 485, although to my untrained eye it looks a lot like it's returning a ref to a temporary. A couple lines later looks only very slightly fishier, but still shouldn't be breaking any aliasing rules. So I leave it to the experts to figure out what's going on here. -- Benoît

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installation on Borland Developer Studio 2006 (C++Builder)
by Harald Wolf - G. Ulmer Automation GbmH 24 Oct '07

24 Oct '07

Hi, how do i install boost with the BSD2006? The installer package seems not to work: ------my first try was------------------------------------------------------ #include "boost/date_time/gregorian/gregorian.hpp" //include all types plus i/o ... ... ---------------------------------------------------------------------------- - i get: [Linker Fataler Fehler] Fatal: Datei 'LIBBOOST_DATE_TIME-BCB-MT-D-1_34_1.LIB' kann nicht geöffnet werden since the C:\Programme\Borland\BDS\4.0\include\boost\boost_1_34_1\lib directory only has *vc* files. So i downloaded the: boost_1_34_1.zip BUT here i have to build the LIBs and i'm a C++ Newbiew! How do i build the Libs? PLEASE HELP!

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[program_options] Translating messages to another language
by Pavel Syomin 24 Oct '07

24 Oct '07

Hi to all! I am writing some application that uses program_options. This application interacts with user using non-english language. Is there any way to translate "what" messages from exceptions to another language? At now I found only one way (rather hack :) ): static void store(const basic_parsed_options<char> &options, variables_map &variables) { try { program_options::store(options, variables); } catch(unknown_option &error) { const char *what = error.what(); static const char prefix[] = "unknown option "; if(!strncmp(what, prefix, sizeof(prefix) - 1)) throw logic_error("Неизвестная опция: " + string(what + sizeof(prefix) - 1)); throw logic_error("Неверный формат командной строки"); } } Another way is to redefine function invalid_command_line_syntax::error_message(), but in such case we can translate only some messages.

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error2632:__int64 problem
by mmoges 24 Oct '07

24 Oct '07

Hi All, I am not sure if this issue has been dealt with already in this forum. But I couldn't find satisfactory answer on the Net. I am using Boost in an application that is working perfectly fine. I had to modify the application in a number of ways and I copied it to a different folder, and when I try to build it, it complains with errors and warnings that have never occured with the orignal application. Please find the error report below: c:\Boost\include\boost-1_33_1\boost\cstdint.hpp(304) : error C2632: '__int64' followed by '__int64' is illegal c:\Boost\include\boost-1_33_1\boost\cstdint.hpp(304) : warning C4091: 'typedef ' : ignored on left of '__int64' when no variable is declared c:\Boost\include\boost-1_33_1\boost\cstdint.hpp(307) : warning C4114: same type qualifier used more than once c:\Boost\include\boost-1_33_1\boost\cstdint.hpp(307) : error C2632: '__int64' followed by '__int64' is illegal c:\Boost\include\boost-1_33_1\boost\cstdint.hpp(307) : warning C4091: 'typedef ' : ignored on left of 'unsigned __int64' when no variable is declared c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xlocmon(231) : fatal error C1903: unable to recover from previous error(s); stopping compilation I am a bit puzzled by this problem. I really appreciate any help. Thank you in advance. Best regards, Metty __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Problem using Boost Graph Library - Python Bindings
by Camilo La Rota 24 Oct '07

24 Oct '07

Hello all, I have just installed the Boost Graph Library - Python Bindings. Everything seemed to be ok, I can read a graph from the example "mst.dot" file and from my own ".dot" files, I can write them back to a file. However, when I try the example script (at the end of the following page: http://www.osl.iu.edu/~dgregor/bgl-python/) -------------------------------------------------------------------- import boost.graph as bgl # Load a graph from the GraphViz file 'mst.dot' graph = bgl.Graph.read_graphviz('mst.dot') # Convert the weight into floating-point values weight = graph.convert_property_map(graph.edge_properties['weight'], 'float') ... etc ------------------------------------------------------------------- it stops at the third line with the following error: ---------------------------------------------------------------------------- Traceback (most recent call last): File "<pyshell#17>", line 1, in <module> weight = graph.convert_property_map(graph.edge_properties['weight'],'float') KeyError: 'weight' ------------------------------------------------------------------------ I receive the same error message if I write only: graph.edge_properties['weight'] The content of the example mst.dot file is: -------------------------------------------------- graph G { A -- C [weight="1.0"] B -- D [weight="1.0"] B -- E [weight="2.0"] C -- B [weight="7.0"] C -- D [weight="3.0"] D -- E [weight="1.0"] E -- A [weight="1.0"] E -- B [weight="1.0"] } -------------------------------------------------- Does any one have any idea about the source of this error. Thanks a lot in advance, Camilo

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seeding a boost::random number generator...?
by Graham Reitz 24 Oct '07

24 Oct '07

I am little confused on how to see a random generator. What am I missing? // Grab the seed HighResTimer::Time time_secs = high_res_timer.getTime(); // Go ahead and truncate, it's just a seed boost::int32_t time = static_cast<boost::int32_t>(time_secs * 100000); // produces randomness out of thin air // see pseudo-random number generators boost::mt19937 rng; rng.seed(); // How do you seed this with the time? // distribution that maps to 0..1 // see random number distributions boost::uniform_real<> zero_to_one(0,1); // glues randomness with mapping boost::variate_generator<boost::mt19937&, boost::uniform_real<> > be_random zero_to_one);

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Re: [Boost-users] Thread Library Problem
by Andres Herrera 23 Oct '07

23 Oct '07

Thanks Raul, that worked like a charm. I feel really dumb now, I tried including pthread in the code not the make file. Thanks again, Andres Herrera -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of raulh39(a)ya.com Sent: Tuesday, October 23, 2007 1:17 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Thread Library Problem On Tue, 23 Oct 2007 09:55:05 -0700 "Andres Herrera" <aherrera(a)MarchNetworks.com> wrote: > Hi, > ... > g++ TestBoost.cpp -o listener -I > /home/andresh/DVRTranslators/Boost/include/boost-1_34_1/ > /home/andresh/DVRTranslators/Boost/lib/libboost_thread-gcc41-mt-d.a > Try to add -pthread: g++ -pthread TestBoost.cpp -o listener \ -I/home/andresh/DVRTranslators/Boost/include/boost-1_34_1 \ /home/andresh/DVRTranslators/Boost/lib/libboost_thread-gcc41-mt-d.a HTH, Raul. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Thread Library Problem
by Andres Herrera 23 Oct '07

23 Oct '07

Hi, I'm new to Boost, I've been trying to use the Thread library that boost offers. I'm on a Kubuntu 7.1 box using G++ 4.1 Compiler with Boost 1.34. I've only been successful compiling my project when including libboost_thread-gcc41-mt-d.so library file. I would much rather use the .a file however, If I try to use the libboost_thread-gcc41-mt-d.a library file, i get the following errors: /home/andresh/DVRTranslators/Boost/lib/libboost_thread-gcc41-mt-d.a(thre ad.o): In function `boost::thread::join()': /home/andresh/DVRTranslators/Boost/boost_1_34_1/libs/thread/src/thread.c pp:226: undefined reference to `pthread_join' /home/andresh/DVRTranslators/Boost/lib/libboost_thread-gcc41-mt-d.a(thre ad.o): In function `~thread': /home/andresh/DVRTranslators/Boost/boost_1_34_1/libs/thread/src/thread.c pp:191: undefined reference to `pthread_detach' /home/andresh/DVRTranslators/Boost/boost_1_34_1/libs/thread/src/thread.c pp:191: undefined reference to `pthread_detach' /home/andresh/DVRTranslators/Boost/lib/libboost_thread-gcc41-mt-d.a(thre ad.o): In function `thread': /home/andresh/DVRTranslators/Boost/boost_1_34_1/libs/thread/src/thread.c pp:156: undefined reference to `pthread_create' /home/andresh/DVRTranslators/Boost/boost_1_34_1/libs/thread/src/thread.c pp:156: undefined reference to `pthread_create' /home/andresh/DVRTranslators/Boost/lib/libboost_thread-gcc41-mt-d.a(mute x.o): In function `boost::try_mutex::do_trylock()': /home/andresh/DVRTranslators/Boost/boost_1_34_1/libs/thread/src/mutex.cp p:260: undefined reference to `pthread_mutex_trylock' collect2: ld returned 1 exit status make: *** [listener] Error 1 I've used the Regex and Filesystem .a library files without a problem, but the Thread .a library file won't work. Here is my code: #include <boost/thread/thread.hpp> #include <iostream> void helloworld() { std::cout << "Hello World!" << std::endl; } int main() { std::cout << "STARTING "; boost::thread thrd(&helloworld); thrd.join(); helloworld(); return 0; } Here is my MakeFile: all: listener listener: TestBoost.cpp g++ TestBoost.cpp -o listener -I /home/andresh/DVRTranslators/Boost/include/boost-1_34_1/ /home/andresh/DVRTranslators/Boost/lib/libboost_thread-gcc41-mt-d.a Any help is greatly appreciated. If you need any more information please ask, I want to try and get this problem resolved soon. Thanks, Andres

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Re: [Boost-users] boost::serialization Is there any way to get rid ofcompiler warnings(C4103, ...) on VC++ 2005?
by "JOAQUIN LOPEZ MU?Z" 23 Oct '07

23 Oct '07

----- Mensaje original ----- De: Oleg Udovenko <oleg(a)enginia.com> Fecha: Martes, Octubre 23, 2007 8:31 pm Asunto: [Boost-users] boost::serialization Is there any way to get rid ofcompiler warnings(C4103, ...) on VC++ 2005? Para: boost-users(a)lists.boost.org > Hi, > > I'm compiling the examples from the boost::serialization library with > VC++ 2005, and getting a lot of warnings, they are quite annoying. > > How can I get rid of them? [...] > 1>C:\WORK\STL\boost\boost_1_34_1 \boost/serialization/collections_save_im > p.hpp(38) : warning C4267: 'initializing' : conversion from > 'size_t' to 'unsigned int', possible loss of data [...] This looks like the same issue as described at http://lists.boost.org/boost-users/2006/03/18075.php with respect to warnings C4312/C4311, basically an oversmart warning triggered by the /Wp64 mode? Is this guess compatible with your environment? If so, the warning can be suppressed without external side effects as shown in http://tinyurl.com/2jpk4b . HTH, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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Boost features targeting Banking Application - Please share your thoughts!!!!!!
by jayaram.x.ganapathy＠jpmorgan.com 23 Oct '07

23 Oct '07

Hi, I am a C++/JAVA developer. Today someone was saying it is time to migrate from legacy C++ systems to JAVA. I love C++ :-( The trend in banking industry or belief in Banking projects is C++ is outdated and JAVA is the solution. One reason I felt is lack of open source enterprise level middlewares for C++. For java we have many EJB servers, Spring framework is there. Will boost be building libraries which will help to build enterprise level application? Some API's like iBatis, hibernate etc. Something similar to JSP and Tomcat equivalent? I think those will attract more developers to C++. Boost community is doing an excellent job. But how much is the industry going to use? Regards, Jayaram ----------------------------------------- This communication is for informational purposes only. It is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction. All market prices, data and other information are not warranted as to completeness or accuracy and are subject to change without notice. Any comments or statements made herein do not necessarily reflect those of JPMorgan Chase & Co., its subsidiaries and affiliates. This transmission may contain information that is privileged, confidential, legally privileged, and/or exempt from disclosure under applicable law. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the information contained herein (including any reliance thereon) is STRICTLY PROHIBITED. Although this transmission and any attachments are believed to be free of any virus or other defect that might affect any computer system into which it is received and opened, it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by JPMorgan Chase & Co., its subsidiaries and affiliates, as applicable, for any loss or damage arising in any way from its use. If you received this transmission in error, please immediately contact the sender and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. Please refer to http://www.jpmorgan.com/pages/disclosures for disclosures relating to UK legal entities.

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boost::serialization Is there any way to get rid of compiler warnings(C4103, ...) on VC++ 2005?
by Oleg Udovenko 23 Oct '07

23 Oct '07

Hi, I'm compiling the examples from the boost::serialization library with VC++ 2005, and getting a lot of warnings, they are quite annoying. How can I get rid of them? Appreciate any suggestions. Thanks, Oleg. 1>------ Rebuild All started: Project: ExampleXmlSave, Configuration: Release x64 ------ 1>Deleting intermediate and output files for project 'ExampleXmlSave', configuration 'Release|x64' 1>Compiling... 1>stdafx.cpp 1>Compiling... 1>ExampleXmlSave.cpp 1>C:\WORK\STL\boost\boost_1_34_1\boost/config/abi_prefix.hpp(19) : warning C4103: 'c:\work\stl\boost\boost_1_34_1\boost\config\abi_prefix.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 1>C:\WORK\STL\boost\boost_1_34_1\boost/archive/detail/abi_prefix.hpp(11) : warning C4103: 'c:\work\stl\boost\boost_1_34_1\boost\archive\detail\abi_prefix.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 1>C:\WORK\STL\boost\boost_1_34_1\boost/archive/basic_text_oprimitive.hpp (54) : warning C4103: 'c:\work\stl\boost\boost_1_34_1\boost\archive\basic_text_oprimitive.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) ... 1>C:\WORK\STL\boost\boost_1_34_1\boost/serialization/collections_save_im p.hpp(38) : warning C4267: 'initializing' : conversion from 'size_t' to 'unsigned int', possible loss of data 1> C:\WORK\STL\boost\boost_1_34_1\boost/serialization/list.hpp(39) : see reference to function template instantiation 'void boost::serialization::stl::save_collection<Archive,std::list<_Ty>>(Archi ve &,const Container &)' being compiled 1> with 1> [ 1> Archive=boost::archive::xml_oarchive, 1> _Ty=std::pair<bus_schedule::trip_info,bus_route *>, 1> Container=std::list<std::pair<bus_schedule::trip_info,bus_route *>> 1> ] 1> C:\WORK\STL\boost\boost_1_34_1\boost/serialization/split_free.hpp(45) : see reference to function template instantiation 'void boost::serialization::save<Archive,std::pair<_Ty1,_Ty2>,std::allocator<_ Ty>>(Archive &,const std::list<_Ty> &,const unsigned int)' being compiled 1> with 1> [ 1> Archive=boost::archive::xml_oarchive, 1> _Ty1=bus_schedule::trip_info, 1> _Ty2=bus_route *, 1> _Ty=std::pair<bus_schedule::trip_info,bus_route *> 1> ] ... 1>Linking... 1> Creating library C:\WORK\STL\TST\ExampleXmlSave\x64\Release\ExampleXmlSave.lib and object C:\WORK\STL\TST\ExampleXmlSave\x64\Release\ExampleXmlSave.exp 1>Generating code 1>Finished generating code 1>Embedding manifest... 1>Build log was saved at "file://c:\WORK\STL\TST\ExampleXmlSave\ExampleXmlSave\x64\Release\BuildL og.htm" 1>ExampleXmlSave - 0 error(s), 68 warning(s) ========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========

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boost::test run by name
by Tim St. Clair 23 Oct '07

23 Oct '07

When is the tentative plan to support "run-by-name" Also, are there plans to support test suite registration which is not run unless explicitly specified? (e.g. - hardware required to perform the test) Thanks for your help, Tim

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numerics question...
by Graham Reitz 22 Oct '07

22 Oct '07

How do you round (i.e. from a float to int) with boost::numerics? It seems like there should be a fairly straightforward method (been poking around the documentation). Thanks, Graham

1 0

[BGL] Compressed Sparse Row Graph and Subgraph
by Jacques Papper 22 Oct '07

22 Oct '07

2 1

Boost.MPI compilation problems with MPICH2
by Aydın Buluç 22 Oct '07

22 Oct '07

Hi all, I was a happy user of Boost.MPI that was working together with the underlying OpenMPI. However, MPI_THREAD_MULTIPLE support of OpenMPI is quite clumsy and it hangs frequently (OpenMPI developers call this as being "lightly tested"). So, I installed MPICH2 that claims to supports thread-safe MPI. At the same time, I didn't want to remove my working OpenMPI implementation and my old Boost libraries built on top of that. Therefore, I rebuilt Boost (--with-mpi) using the new mpicxx of MPICH (so that it finds the correct MPICH2 directories, etc) on a different location . Everything went ok during compilation and installation. However, I have compilation errors when trying to run any mpi program. For example, with the test suite provided by Boost.MPI itself, I get errors like (this is for all_gather.cpp specifically but I get similar ones with every other test): ------------------------------------- /tmp/ccbyPLBK.o: In function `void boost::mpi::detail::all_gather_impl<int>(boost::mpi::communicator const&, int const*, int, int*, mpl_::bool_<true>)':all_gather_test.cpp:(.gnu.linkonce.t._ZN5boost3mpi6detail15all_gather_implIiEEvRKNS0_12communicatorEPKT_iPS6_N4mpl_5bool_ILb1EEE[void boost::mpi::detail::all_gather_impl<int>(boost::mpi::communicator const&, int const*, int, int*, mpl_::bool_<true>)]+0x1c): undefined reference to `boost::mpi::communicator::operator int() const' /tmp/ccbyPLBK.o: In function `void boost::mpi::detail::broadcast_impl<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >(boost::mpi::communicator const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >*, int, int, mpl_::bool_<false>)':all_gather_test.cpp:(.gnu.linkonce.t._ZN5boost3mpi6detail14broadcast_implISsEEvRKNS0_12communicatorEPT_iiN4mpl_5bool_ILb0EEE[void boost::mpi::detail::broadcast_impl<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >(boost::mpi::communicator const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >*, int, int, mpl_::bool_<false>)]+0x27): undefined reference to `boost::mpi::communicator::operator int() const' ------------------------------------- I "quadruple-checked" to see that the versions of mpicxx/libraries/include directories all belong to the new installation of MPICH2 and not remainders of old OpenMPI installation. Thus, I don't think that is a binary incompatibility issue. MPICH2 implementation works OK alone (without boost) and the old Boost+OpenMPI installation libraries also still work. But the new Boost+MPICH2 libraries... ihhh :( Any suggestions and pointers will be appreciated. Thanks, -- Aydin

2 1

Re: [Boost-users] [mpl] at_c type compiler error
by Robbie Morrison 22 Oct '07

22 Oct '07

------------------------------------------------------------ Subject: Boost-users Digest, Vol 1423, Issue 3 Date: Thu, 18 Oct 2007 12:00:06 -0400 Message-ID: <mailman.11.1192723206.19439.boost-users(a)lists.boost.org> ------------------------------------------------------------ Message: 3 Date: Thu, 18 Oct 2007 17:03:25 +0200 From: Vinzenz 'evilissimo' Feenstra <evilissimo(a)web.de> Subject: Re: [Boost-users] [mpl] at_c type compiler error To: boost-users(a)lists.boost.org Message-ID: <471775BD.3010403(a)web.de> ------------------------------------------------------------ Chris Weed schrieb: >>> >>> { >>> >>> return t.get<0>(); >>> >>> } >> >> { >> >> return boost::get<0>(t); >> >> } Hi all -- Just to say I encountered what looks to be the same problem. Here is the note I left myself: // can later access the statistics as follows: // // std::tr1::tuple<int, double, double, double, double, double> stats; // stats = myTs.getStats(); // int count; // count = stats.get<0>(); // member function usage (could be buggy) // count = std::tr1::get<0>(stats); // free function usage Also: #include <tr1/tuple> // n-tuples I relealize this is the TR1 version and not the Boost version. Please let me know if some stripped down example code would be useful. My development environment for the record: boost : 1.34.1 (via ./configure; make all; make install) gcc : 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5) os : Ubuntu 6.10, Linux 2.6.17-12-generic (7.04 is current) hardware : Toshiba Tecra A2 330 laptop (purchased Aug-2004) cheers Robbie --- Robbie Morrison PhD student -- policy-oriented energy system simulation Institute for Energy Engineering (IET) Technical University of Berlin (TU-Berlin), Germany [from IMAP client]

5 5

Adjacency matrix problem
by abhishek.v＠tcs.com 22 Oct '07

22 Oct '07

Hi I m trying to implement adjacency matrix. typedef boost::adjacency_matrix<boost::undirectedS> Graph; Graph(N); Now here can the N be a variable as what i want is create graph by varying the value of N which taken as an input from user. Following is the snippet of my code... int main(int argc, char *argv[]) { int SIZE; cout<<"\n Enter the matrix size (nxn) :-"; cin>>SIZE; Graph g(SIZE); .................... ..................... return 0; } And the runtime error is as follows :- Assertion failed: false, file BoostLib/boost_1_34_1/boost/graph/adjacency_matrix.hpp, line 941 Same code works fine in case of adjacency_list but in case of adjacency_matrix it is giving run time error. What could be the reason for this... Thanks Abhishek Vyas Tata Consultancy Services Mailto: abhishek.v(a)tcs.com Website: http://www.tcs.com ____________________________________________ Experience certainty. IT Services Business Solutions Outsourcing ____________________________________________ =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you

2 1

problem integrating lambda and gsl
by Luke Shulenburger 22 Oct '07

22 Oct '07

I am writing some code that involves several uses of the gnu scientific library that I am trying to streamline using boost lambda. I am having some newbie problems with some rather lengthy compiler errors. Here's a fairly minimal set description of my problem. First I have a functor class that does some relatively complicated processing: class functor : public std::unary_function<double,double> { public: double operator()(double x) const { // do some work here return something; } } For use with the gsl, I have created a wrapper to make this linto something that can be handled by the gsl routines: template<class func> double gslfunc(double x, void* p) { func* f = reinterpret_cast<functor*>(p); return (*f)(p); } I now have the following function that allows me to use gsl routines: template<class func> double myRoutine(func& f) { gsl_function F; F.function = &gslfunc<functor>; F.params = reinterpret_cast<void*>(&f); // call some gsl routines with the gsl_function return something; } I can now use gsl routines on the above functor with no difficulty. What I would like to be able to do is use lambda expressions to make slight modifications to the underlying functor, for example take the following code snippet: functor f; myRoutine(bind(f,_1)+1); However, this dies a horrible death upon compilation complaining that there is no available conversion from the type that is generated by bind(f,_1)+1 to void*. I suspect that there is no way to get a pointer to a lambda'd function and that this is causing my problem. Am I correct? I would happy to provide any more details about what I am doing or the gsl bindings if that would be helpful. Thanks for your consideration. Luke Shulenburger (shulenbu(a)uiuc.edu)

1 0

boost::format: get expected number of arguments
by Ruben Lopez 22 Oct '07

22 Oct '07

Hi, I am using boost::format in my project, and I would need to know what is the exact number of arguments expected, because the format is written by the end-user, and the program has no way to know it. I have seen that the format class actually has some attributes with this value, but I couldn't see any public methods to get them. Is there any way of getting the expected number of arguments? Thanks in advance.

1 0

which libs to link to for serialization?
by Mark Wyszomierski 21 Oct '07

21 Oct '07

Hi, I have an installer for win32 which installs the boost libraries. I'm trying to link to the serialization libraries, and several copies have been created in the boost/lib folder: libboost_serialization-vc80-mt-1_33_1.lib libboost_serialization-vc80-mt-gd-1_33_1.lib libboost_serialization-vc80-mt-s-1_33_1.lib libboost_serialization-vc80-mt-sgd-1_33_1.lib Which version should be linked to when? Right now I'm using a trial and error method to see which one my win32 apps can link to without linking errors. Thanks, Mark

2 1

Parag is your Yaar! :)
by Parag 21 Oct '07

21 Oct '07

1 0

[date_time] Error including posix_time headers using VC80
by Wilson Barbosa 20 Oct '07

20 Oct '07

Hi there, I've got the following error messages when including posix_time.h or posix_time_types.h on a project: ------ Build started: Project: ics99200, Configuration: Debug Win32 ------ Compiling... controle_proc_ora.cpp c:\arquivos de programas\microsoft visual studio 8\vc\platformsdk\include\rpcndr.h(147) : error C2632: 'char' followed by 'int' is illegal c:\arquivos de programas\microsoft visual studio 8\vc\platformsdk\include\rpcndr.h(147) : warning C4091: 'typedef ' : ignored on left of 'unsigned char' when no variable is declared c:\arquivos de programas\microsoft visual studio 8\vc\platformsdk\include\wtypes.h(1075) : error C2371: 'BOOLEAN' : redefinition; different basic types c:\arquivos de programas\microsoft visual studio 8\vc\platformsdk\include\winnt.h(770) : see declaration of 'BOOLEAN' I'm using Visual C++ 8.0 compiler (VS2005 Pro), MS-Windows XP Pro SP2 and the default options on the Boost build. Does anybody have a clue of what is (exactly) happening here and about any solution/workaround for this? TIA, WB::

1 0

[Graph] edge list cache
by Krishna Roskin 20 Oct '07

20 Oct '07

Hello all, I'm working on implicitly defined graphs using the graph boost library. The out_edges function (for example) generates the list of out edges on the fly and returns a shared_container_iterator. Creating this list takes a non-trivial amount of time and so I'd like to cache the result of out_edges so that future calls don't duplicate. But I'm not sure how to do this and still fit within the "BGL way." My first instinct was to add the cache as a member of the graph. But this means that out_edges has to take a non-const reference so that it can update the graph and this causes problems for filtered_graph and reverse_graph. Right now I'm toying with making my cache global and keyed to the address of the graph but this seems inelegant. Anyone have any suggestions? -krish

2 2

[general] bash script to filter compiler output
by Robbie Morrison 20 Oct '07

20 Oct '07

Hi all Postings here often comment on the amount of compiler output generated when using Boost libraries. I found the following script quite useful when trying to track down both bad practice and real errors in my own code. It works something like this: $ callfilter -6 make This script filters the compiler output based on the options -0 thru -7. Option -- has no effect and is provided for typing convenience. Options -5 and -6 are typically the most useful. Some comments at the start of the script provide more information. I find g++ -Weffc++ often rather helpful, but its use definitely requires some form of output screening. Here is the usage message for this script: usage: callfilter [-01234567] <call> modified call with output filtering callfilter -- <call> straight call (provided for convenience) callfilter --help|-h display usage message and quit purpose: append selected filters to build calls to suppress Boost library output additive: 0 2>&1 1 | grep -v 'boost::' | grep -v 'std::tr1::' 2 | grep -v '/include/boost-1_34_1/' | grep -v '/include/c++/4.1.2/tr1/' 4 | grep -v 'instantiated from' examples: $ callfilter -- make $ callfilter -7 g++ -Wall -Weffc++ usingboost.cc -o usingboost If anyone has improvements, let me know. I will endeavor to incorporate these and then repost in a couple of weeks. cheers Robbie Morrison --- [from IMAP client] #! /bin/bash # Copyright: (c) 2007 Robbie Morrison. All rights reserved. # License: Unrestricted reuse in any form, for any purpose. # Version: $Id: callfilter,v 1.7 2007/10/19 11:26:41 robbie Exp $ # Purpose: take a command-line build call and append some # selected 'grep' filters to reduce the amount of output # displayed. A build call could be just 'make' or perhaps # g++ with a string of arguments. The individual filters # are intended to suppress the screenfulls of warnings # generated by Boost library headers, while leaving the # compiler messages that relate more directly to your code. # The ability to mix different combinations of filters is # often useful. The UNIX 'grep' utility does the filtering # and -v is the 'invert-match' option. This script can be # particularly valuable in combination with the '-Weffc++' # option for g++. In fact, the script was developed # because of a comment suggesting such an approach on the # g++ manpage. # # See also: for a more sophisticated approach, # refer to: http://www.bdsoft.com/tools/stlfilt.html # define some suitable filters -- please modify to suit your needs FILTER_0="2>&1" # useful when capturing output FILTER_1="| grep -v 'boost::' | grep -v 'std::tr1::'" FILTER_2="| grep -v '/include/boost-1_34_1/' | grep -v '/include/c++/4.1.2/tr1/'" FILTER_4="| grep -v 'instantiated from'" # preamble SCRIPT=$(basename "$0") # for console reporting # script exit codes E_SUCCESS=0 E_USAGE=2 E_NO_GREP=3 # functions function display_help # using simple echo statements { echo echo " usage: $SCRIPT [-01234567] <call> modified call with output filtering" echo " $SCRIPT -- <call> straight call (provided for convenience)" echo " $SCRIPT --help|-h display usage message and quit" echo " purpose: append selected filters to build calls to suppress Boost library output" echo " additive: 0 $FILTER_0" echo " 1 $FILTER_1" echo " 2 $FILTER_2" echo " 4 $FILTER_4" echo " examples: \$ $SCRIPT -- make" echo " \$ $SCRIPT -7 g++ -Wall -Weffc++ usingboost.cc -o usingboost" echo } function make_filter # with conventional rather than bitwise arithmetic { local base=4 # option range is from 0 to (2 ** base - 1) local num=${opt#-} # strip leading - while [ $base -gt 0 ] do if [ $num -ge $base ] then let "num = num % base" # remainder operator case "$base" in 1) filter="$FILTER_1 $filter" ;; 2) filter="$FILTER_2 $filter" ;; 4) filter="$FILTER_4 $filter" ;; esac fi let "base = base / 2" # divide by two done filter="$FILTER_0 $filter" } # process our part of the command-line case "$1" in --help|--hel|--he|--h|-help|-hel|-he|-h|-\?) display_help exit $E_SUCCESS ;; -[0-7]) opt="$1" shift make_filter ;; --) shift ;; "") echo "$SCRIPT: try --help for usage" exit $E_USAGE ;; esac # confirm that grep is present on the system if [ ! $(which grep) ] then echo "$SCRIPT: required utility not found: grep" echo "$SCRIPT: unable to continue" exit $E_NO_GREP fi # active code echo "$SCRIPT: call : $*" echo "$SCRIPT: filter : $filter" eval "$* $filter" # actual call # housekeeping exit $E_SUCCESS # end of file

2 1

[tuple] easy way to bind to get
by Chris Weed 19 Oct '07

19 Oct '07

Hi, I would like to bind to the boost::get<N> function for use by transform iterator. This is the pseudo code if get worked like a simple function. std::vector<tuple<int,int,float> > v(2); v[0] = tuple<int,int,float>(2,2,2.2f); v[1] = tuple<int,int,float>(3,3,3.3f); std::accumulate( boost::make_transform_iterator( v.begin(), boost::lambda::bind(&boost::get<1>,_1)), boost::make_transform_iterator( v.end(), boost::lambda::bind(&boost::get<1>,_1)), 0); I find bind is difficult to use for functions that deduce template arguments from function arguments. I thought if I changed boost::get<1> -> boost::get<1,tuple<int,int,float> > That didn't work either. Digging through tuple.hpp makes my head spin. Is there an easy way to do this. Thanks, Chris

3 2

Warning binding member functions returning template types on MSVC80
by Josef Grahn 19 Oct '07

19 Oct '07

Hi, Visual Studio 2005 gives me warning C4180 ("qualifier applied to function type has no meaning; ignored") when binding member functions that has a templatized type as return type with boost::bind, but I can't see any reason why it should. The following example reproduces the warning: #include <boost/bind.hpp> template <typename T> struct Foo {}; struct Bar { Foo<void> f() { return Foo<void>(); } int g() { return 0; } }; Foo<void> f() { return Foo<void>(); } int main(int argc, const char **argv) { Bar b; boost::bind(&Bar::f, &b); // Warning C4180 (see below) boost::bind(&Bar::g, &b); // No warning boost::bind(f); // No warning return 0; } So far as I have tested, the program appears to function properly. The full warning is as follows (paths shortened): C:\...\boost/bind.hpp(1575) : warning C4180: qualifier applied to function type has no meaning; ignored C:\...\boost/bind.hpp(1609) : see reference to class template instantiation 'boost::_bi::add_cref<Pm,I>' being compiled with [ Pm=Foo<void> (__thiscall Bar::* )(void), I=1 ] ..\..\..\src\main.cpp(14) : see reference to class template instantiation 'boost::_bi::dm_result<Pm,A1>' being compiled with [ Pm=Foo<void> (__thiscall Bar::* )(void), A1=Bar * ] GCC 4.1.2 on Linux compiles the code without warnings. Any insights are greatly appreciated! Best regards, Josef Grahn

1 0

BGL: Bundled Properties with pointer type
by Benoît Dagon 19 Oct '07

19 Oct '07

Hi all, It's my first time submitting a question on a newsgroup so pardon me if I'm wrong in my way of doing. I have a graph of type BoostGraph_t defined like typedef boost::adjacency_list <vecS, vecS, undirectedS, NodeProperty*, EdgeProperty*> BoostGraph_t; with vertex and edge properties types defined as pointer on the following stuctures struct EdgeProperty { long m_id; double m_length; }; struct NodeProperty { long m_id; }; I'm now trying to use the dijkstra_shortest_paths() function with the edge length as parameter for the weigh_map function argument. But the call to the following function get(&EdgeProperty::m_length, m_graph); returns me the following errors ****** e:\Boost\boost\graph\properties.hpp(337) : error C2825: 'Bundle::*': cannot form a qualified name e:\Boost\boost\graph\properties.hpp(337) : error C2226: syntax error : unexpected type 'Graph' e:\Boost\boost\graph\properties.hpp(337) : error C2334: unexpected token(s) preceding ':'; skipping apparent function body e:\Boost\boost\graph\properties.hpp(342) : error C2825: 'Bundle::*': cannot form a qualified name e:\Boost\boost\graph\properties.hpp(342) : error C2657: '`global namespace'::*' found at the start of a statement (did you forget to specify a type?) e:\Boost\boost\graph\properties.hpp(342) : error C2653: 'operator``global namespace''' : is not a class or namespace name e:\Boost\boost\graph\properties.hpp(342) : error C2501: 'boost::bundle_property_map<Graph,Descriptor,Bundle,T>::pm' : missing storage-class or type specifiers with [ Graph=boost::adjacency_list<boost::vecS,boost::vecS, boost::undirectedS,NodeProperty *,EdgeProperty *>, Descriptor=boost::property_map<boost::adjacency_list<boost::vecS, boost::vecS,boost::undirectedS,NodeProperty *,EdgeProperty *>, double EdgeProperty::* >::descriptor, Bundle=boost::property_map<boost::adjacency_list<boost::vecS, boost::vecS,boost::undirectedS,NodeProperty *,EdgeProperty *>, double EdgeProperty::* >::actual_bundle, T=double ] ****** I know it's working correctly if I use NodeProperty and EdgeProperty for graph template arguments instead of pointers. But I would like to know if it's possible to do it in that way and how would be the correct syntax for the get() to work properly. Many thanks in advance for your help! ~Benoît

2 2

Re: [Boost-users] [fusion] subset view
by dan marsden 19 Oct '07

19 Oct '07

>I would like to make a subset view of the element in a tuple. It >would, for example, give me a view into the first, third, and fifth >element of the tuple. It isn't clear how to do this with the available >views. You could do the following (untested): * Use zip to zip an mpl range of numeric indexes to your sequence * Use filter to extract the positions you want, based on the indices zipped on above * Use transform to remove the position labels so the sequence elements are just your desired data. The above works only if you need const access, as the algorithms return views to const data. If you need non-const data, you can use the corresponding views. The above is somewhat awkward, if there is some criteria other than position index that can be used to extract your elements, you may be able to do a lot better. Or you could choose different data structures to start off with, for example if you really have 2 subsets of elements, sub0 and sub1, and you know they're separate, store them in 2 fusion containers, and when you need to work on the whole, use fusion::join to glue them together. HTH Cheers Dan ___________________________________________________________ Yahoo! Answers - Got a question? Someone out there knows the answer. Try it now. http://uk.answers.yahoo.com/

2 1

sorting an ublas matrix by a certain column
by Alexander Schmolck 19 Oct '07

19 Oct '07

Hi, If I have a boost::numeric::ublas::vector<double> v, I can use the STL's sort and boost::lambda. sort(v.begin(), v.end(), _1<_2); How do I do the same with matrix<double>, using, say column 3 as sort key (i.e. I want to reorder the rows in the matrix by their 3rd entry)? sort(m.begin1(), m.end1(), _1[3]<_2[3]); won't do the trick, and I really have a hard time figuring out what does. In case it's not clear what I want, here's an example: [0,0,1,4 0,0,2,3 0,0,3,2 0,0,4,1] => [0,0,4,1 0,0,3,2 0,0,2,3 0,0,1,4] cheers, 'as

1 0

How well does Boost support cross-compilation?
by n.torrey.pines＠gmail.com 19 Oct '07

19 Oct '07

I'm dreaming of compiling MinGW, OS X (Intel and PowerPC) and Linux x86 versions of my program in one go, perhaps on Linux. The program uses little other than several Boost libraries. Is this a possible and reliable usage scenario? This doesn't seem like a particularly original idea, so I'm sure others explored it. Are there any how-to's? I couldn't find any.

3 5

Boost Regex use of &*string.begin()
by Sudarshan Gaikaiwari 19 Oct '07

19 Oct '07

Hi The boost regex library makes liberal use of &*string.begin() For example ---------------------------------------------------------------------------------------- std::string result(++bytes, '\0'); bytes = ::LCMapStringW( id, // locale identifier LCMAP_SORTKEY, // mapping transformation type p1, // source string static_cast<int>(p2 - p1), // number of characters in source string reinterpret_cast<wchar_t*>(&*result.begin()), // destination buffer *of bytes* bytes // size of destination buffer ); -------------------------------------------------------------------------------------------------------------------- Is this construct safe? Are its semantics specified by the standard? regards Sudarshan -- Sudarshan Gaikaiwari www.sudarshan.org sudarshan(a)acm.org

2 1

[xpressive] crash again :(
by Ovanes Markarian 19 Oct '07

19 Oct '07

Well, sorry I did not check mails before. Actually, I should have thought about it, that token_iterator applies a transformation on each iteration. Many thanks. It was already late in the night, when I faced this. Sorry for disturbing your sister's wedding. Hope you will enjoy it! Best wishes to your sister and her husband! With Kind Regards, Ovanes On 10/18/07, Eric Niebler <eric(a)boost-consulting.com> wrote: > > Eric Niebler wrote: > > Eric Niebler wrote: > >> Ovanes Markarian wrote: > >>> Hello Eric, > >>> > >>> sorry for bothering. I use xpressive in the following context: > >> <snip> > >> > >> I can't get your code to compile. Please send a minimal and complete > >> source file that demonstrates the problem. > > > > After fiddling with your code a bit, I got it to compile, but I'm not > > seeing any assertions, exceptions or crashes. What version are you > using? > > Me again. I realized I wasn't seeing the problem because I hadn't put > any strings in the vector over which you were iterating. When I do, I > can reproduce the assert. This is not a bug in xpressive, it is a bug in > your code. The problem is here: > > std::tr1::bind(&apply_regex, sem_separated, td::tr1::placeholders::_1) > > In this call to bind, you pass sem_separated to bind() *by value*. You > return a regex_token_iterator, which holds a reference to the > (temporary) regex object. When the temporary regex object goes away, the > regex_token_iterators are left holding dangling references. > > The lifetime of a regex_token_iterator cannot exceed the lifetime of the > regex it holds. > > If you change the code to ... > > std::tr1::bind(&apply_regex, std::tr1::ref(sem_separated), > td::tr1::placeholders::_1) > > ... it works just fine. > > HTH, > > -- > Eric Niebler > Boost Consulting > www.boost-consulting.com > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

1 0

Feature request for serialization
by Robert Bielik 19 Oct '07

19 Oct '07

It would be nice to be able to specify a callback that can notify how far a serialization (at loading) has come. I have a structure that can take a LONG time to load, and it would be good to be able to present a progress bar for the user. /R

4 5

visual studio 2005/2008: example runs in debug-mode, does not run in release mode
by Vincent Vega 19 Oct '07

19 Oct '07

Hi there! - used the BoostPro Binary Installer for Visual C++ to obtain boost 1.34.1 - downloaded the following example for maximum_cardinality_matching: http://www.boost.org/libs/graph/example/matching_example.cpp - created an project using VS2005 as well as VS2008 Got the following problem (using both studios): - everythings fine while using the debug-mode - project runs but produces wrong results when in release-mode Anybody has an idea what causes my problem? Thanks in advance Dirk -- Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten Browser-Versionen downloaden: http://www.gmx.net/de/go/browser

2 1

[xpressive] crash again :(
by Ovanes Markarian 18 Oct '07

18 Oct '07

Hello Eric, sorry for bothering. I use xpressive in the following context: typedef x::sregex regex_type; const regex_type non_semicolon = ~x::as_xpr(';'); const regex_type sem_separated = *non_semicolon; typedef boost::iterator_range<x::sregex_token_iterator> regex_tokens; typedef ::std::vector<regex_tokens> regex_transformed_collection; inline regex_tokens apply_regex(regex_type const& re, std::string const& item) { typedef x::sregex_token_iterator sre_iter; return boost::make_iterator_range(sre_iter(item.begin(), item.end(), re), sre_iter()); } // usage: std::vector<std::string> v; //vector is filled with strings of type: some_part;some_other_part typedef regex_transformed_coll::const_iterator re_citer; regex_transformed_collection sep_strings; ::std::transform ( v.begin(), v.end(), ::std::back_inserter(sep_strings) , ::std::tr1::bind(&apply_regex, sem_separated, tr1::placeholders::_1) ); //v is in the same scope and valid for(re_citer curr=sep_strings.begin(), end=sep_strings.end(); curr!=end; ++curr) { regex_tokens const& toks = *curr; std::string source = toks.front(); //this line is fine and returns me the first part of a string... // all subsequent line will raise an assertion std::string includes = *++toks.begin(); size_t sz = toks.size(); } Is there smth. I did not take in account? This code crashes in: regex_token_iterator.hpp: regex_token_iterator<BidiIter> &operator ++() { ->>HERE>> this->fork_(); // un-share the implementation And is caused by regex_token_iterator_impl ctor. I know this code is not very efficient, since it iterates through the collection of strings twice instead of doing smth. within one run, but it is just an example. Many thanks, Ovanes

2 3

Scalability test overBGL
by abhishek.v＠tcs.com 18 Oct '07

18 Oct '07

Hi.. I m performing scalability test over BGL . Means i m checking out how big a graph can be constructed using BGL. For the moment i m considering complete graph. I m able to construct a complete graph with 3000 vertices but beyond that it crashes. Anybody who has done scalability test over BGL Kindly help. As this can be treated as a benchmark for BGL and then we can improve on this in near future... Following is my code.. #include <cstdlib> #include <iostream> #include<vector> #include <iostream> #include <fstream> #include <string> #include <boost\config.hpp> #include <boost\graph\adjacency_list.hpp> #include<boost\property_map.hpp> #include<vector> #include<string> #include<algorithm> using namespace std; using namespace boost; typedef unsigned long long ullong; typedef adjacency_list < vecS, vecS, undirectedS, property < vertex_name_t, std::string >, property < edge_name_t, std::string ,property < edge_weight_t, int > > > Graph; Graph g; typedef graph_traits < Graph >::vertex_descriptor Vertex; std::vector<vector<int> > adj_matrix; fstream file_op("C:\\Scalability\\output\\debug.out",ios::out); int main(int argc, char *argv[]) { int SIZE; cout<<"\n Enter the matrix size"; cin>>SIZE; cout<<"\n The matrix is "<<SIZE<<"x"<<SIZE; Vertex u; for(int i=0;i<SIZE;i++) { u=add_vertex(g); } for(ullong i=0;i<SIZE;i++) { for(ullong j=0;j<SIZE;j++) { if(i!=j) { add_edge(i,j,g); } } } file_op<<"\n Number of vertices in the graph "<<num_vertices(g); long double nume=num_edges(g); file_op<<"\n Number of edges in the graph "<<nume; system("PAUSE"); return EXIT_SUCCESS; } Thanks Abhishek Vyas Tata Consultancy Services Mailto: abhishek.v(a)tcs.com Website: http://www.tcs.com ____________________________________________ Experience certainty. IT Services Business Solutions Outsourcing ____________________________________________ =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you

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[BGL, Serialization] Serialization of vertex|edege properties
by David Angelo 18 Oct '07

18 Oct '07

Hi folks, I am using the BGL and now I want to serialize the graph. Serialization of the vertices and edges works fine, but how do I serialize the vertex|edge properties? My properties and graph definition are the following: <code> struct vertex_cId_t { typedef vertex_property_tag kind; }; struct vertex_cType_t { typedef vertex_property_tag kind; }; struct vertex_cShape_t { typedef vertex_property_tag kind; }; struct edge_cType_t { typedef vertex_property_tag kind; }; struct edge_cColor_t { typedef vertex_property_tag kind; }; namespace boost { BOOST_INSTALL_PROPERTY(vertex, cId); BOOST_INSTALL_PROPERTY(vertex, cType); BOOST_INSTALL_PROPERTY(vertex, cShape); BOOST_INSTALL_PROPERTY(edge, cType); BOOST_INSTALL_PROPERTY(edge, cColor); } typedef property<vertex_cId_t, std::string> CVertexId; typedef property<vertex_cShape_t, std::string, CVertexId> CVertexShape; typedef property<vertex_cType_t, int, CVertexShape> CVertexAttribute; typedef property<edge_cColor_t, string> CEdgeColor; typedef property<edge_cType_t, int, CEdgeColor> CEdgeAttribute; typedef adjacency_list<vecS, vecS, undirectedS, CVertexAttribute, CEdgeAttribute> Graph; </code> How must the serialize functions for CVertexAttribute and CEdgeAttribute look like? Thanks in advance. David

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Re: [Boost-users] [serialization]-- (corrected) serialize binary data to a memory buffer?
by Rich Peters 18 Oct '07

18 Oct '07

I have been having some issues trying to get this relatively simple binary memory based serialization to work. If I use a byte type below, I get errors with not finding a matching ctor: If I use a char, it compiles and thows an exception in binary_iarchive_impl.hpp at line 52: this->basic_binary_iarchive<Archive>::init(); which appears to be related to char string processing. can anyone help me sort this out? thanks Rich ====================== #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/iostreams/device/array.hpp> #include <boost/iostreams/stream_buffer.hpp> #include <boost/iostreams/stream.hpp> .... std::vector<byte> store(1000, 0x00) ; // std::vector<char> store(1000, 0x00) ; // other test boost::iostreams::stream <boost::iostreams::array > theStream(&store[0], &store[0]+store.size()) ; // save data to archive { boost::archive::binary_oarchive oa(theStream); oa & theInfo; // archive closed when destructors are called } c:\Program Files\boost\boost_1_34_1\boost\iostreams\stream.hpp(112) : error C2665: 'boost::iostreams::basic_array<Ch>::__ctor' : none of the 5 overloads can convert parameter 1 from type 'unsigned char *__w64 const ' with [ Ch=char ] and [ Ch=char ] c:\Program Files\boost\boost_1_34_1\boost\iostreams\device\array.hpp(90): could be 'boost::iostreams::basic_array<Ch>::basic_array(boost::iostreams::basic_array<Ch>::char_type *,boost::iostreams::basic_array<Ch>::char_type *)' with [ Ch=char ] c:\Program Files\boost\boost_1_34_1\boost\iostreams\device\array.hpp(90): or 'boost::iostreams::basic_array<Ch>::basic_array(boost::iostreams::basic_array<Ch>::char_type *,size_t)' with [ Ch=char ] c:\Program Files\boost\boost_1_34_1\boost\iostreams\device\array.hpp(90): or 'boost::iostreams::basic_array<Ch>::basic_array(const boost::iostreams::basic_array<Ch>::char_type *,const boost::iostreams::basic_array<Ch>::char_type *)' with [ Ch=char ] c:\Program Files\boost\boost_1_34_1\boost\iostreams\device\array.hpp(90): or 'boost::iostreams::basic_array<Ch>::basic_array(const boost::iostreams::basic_array<Ch>::char_type *,size_t)' with [ Ch=char ] while trying to match the argument list '(unsigned char *__w64 const , unsigned char *__w64 const )' c:\Dev\Shared-ADL Integration\UnitTest\BoostSerialization\BoostSerialization\Serialize.h(194) : see reference to function template instantiation 'boost::iostreams::stream<Device>::stream<std::allocator<_Ty>::value_type*__w64 ,std::allocator<_Ty>::value_type*__w64 >(const U0 & ,const U1 & )' being compiled with [ Device=boost::iostreams::array, _Ty=unsigned char, U0=std::allocator<unsigned char>::value_type *__w64 , U1=std::allocator<unsigned char>::value_type *__w64 ] thanks Rich Matthias Troyer wrote: You can use the Boost IOstreams library to create an iostream using a memory buffer and use that with the binary archives Matthias

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[mpl] at_c type compiler error
by Chris Weed 18 Oct '07

18 Oct '07

Hi, I can't figure out why the following code generates a compile error with gcc 3.4: #include <boost/mpl/vector_c.hpp> #include <boost/mpl/at.hpp> #include <boost/tuple/tuple.hpp> template<typename E,typename T> typename boost::tuples::element<boost::mpl::at_c<E,0>::type::value,T>::type foo(E e,T t) { return t.get<0>(); } int main() { typedef boost::mpl::vector_c<int,0,1> elements; boost::tuple<int> t(1); foo(elements(),t); } main.cpp: In function `typename boost::tuples::element< boost::mpl::at_c<E,0l>::#`typename_type' not supported by pp_cxx_unqualified_id#::value, T>::type foo(E, T)': main.cpp:10: error: expected primary-expression before ')' token main.cpp: In function `typename boost::tuples::element< boost::mpl::at_c<E,0l>::#`typename_type' not supported by pp_cxx_unqualified_id#::value, T>::type foo(E, T) [with E = boost::mpl::vector_c<int, 0l, 1l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l, 2147483647l>, T = boost::tuples::tuple<int, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>]': main.cpp:17: instantiated from here main.cpp:10: error: invalid use of member (did you forget the `&' ?)

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