July 2008 - Boost-users - lists.preview.boost.org

boost::program_options
by Duy Nguyen 09 Oct '08

09 Oct '08

When I try to use the boost::program_options library to read a property file, I got the error when I run "make" on Cygwin (I installed Cygwin on WIndows XP). > make g++.exe -I /cygdrive/c/MyTest/Test1/include/boost-1_34_1/ -c TestInit.cpp Test.cpp TestDriver.cpp g++.exe -I /cygdrive/c/MyTest/Test1/include/boost-1_34_1/ -c TestInit.cpp Test.cpp TestDriver.cpp g++.exe -I /cygdrive/c/MyTest/Test1/include/boost-1_34_1/ -c TestInit.cpp Test.cpp TestDriver.cpp g++.exe TestInit.o Test.o TestDriver.o -o "TestDriver" -L/cygdrive/c/MyTest/Test1/lib -lboost_program_options-gcc34-mt-d-1_34_1 -lg2c Info: resolving vtable for boost::program_options::variables_mapby linking to __imp___ZTVN5boost15program_options13variables_mapE (auto-import) Then when I run my program, it does not work. If I comment out the "try ... catch" block which uses the boost::propram_options library then it compiles and works fine. Please show me how to fix it. Thank you.

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boost::filesystem exception not caught on MacOS X
by Lothar May 21 Sep '08

21 Sep '08

Hi, I have a strange problem that an exception thrown by a boost::filesystem directory_iterator is not caugth on MacOS X. Please consider the following code: ("const string &dir" is a parameter) bool retVal = true; try { directory_iterator i(dir); directory_iterator end; while (i != end) { // do something ++i; } } catch (...) { retVal = false; } While this works perfectly on Windows and Linux (the exception is caught fine), on MacOS I get the following: terminate called after throwing an instance of 'boost::filesystem::basic_filesystem_error<boost::filesystem::basic_path<std::string, boost::filesystem::path_traits> >' what(): boost::filesystem::basic_directory_iterator constructor Abort trap The program runs fine (withouth the trap) if I comment out the upper lines. I use the boost 1.34.0 lib built as universal binary on MacOS 10.5, according to the instructions at http://svn.boost.org/trac/boost/wiki/CMakeConfigAndBuild I link to the static non-debug mt version of boost_filesystem. Exceptions within my program are caught fine, just this boost exception is not caught. The program is also compiled as non-debug. Any help would be very much appreciated. Regards, Lothar

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Boost Graph Library and Boehm Garbage Collector
by FBSL 08 Sep '08

08 Sep '08

Hello I am having trouble to garbage-collect adjacency_list<>. I have instanciated it with correctly garbage-collected vectors and lists (I have copied vecS and listS definitions, and added Boehm GC's default allocator so that they are garbage-collected). In my application I need to dynamically allocate many graphs, but it does not work, there is a (big) memory leak. Unfortunately, there is no template argument in adjacency_list<> to specify Boehm GC's allocator. Does anyone have a hint ? Snippet code "main.cpp" follows, compiled with Boost Graph Library 1.32, Boehm GC 6.4 and G++ 3.3.5, with command line : $ g++ -o main main.cpp -lgc -lgccpp -- #include <boost/graph/adjacency_list.hpp> #include <gc/gc_allocator.h> #include <gc/gc_cpp.h> #include <iostream> #include <vector> #include <list> using namespace std; using namespace boost; namespace boost { struct collected_vecS {}; struct collected_listS {}; template <class ValueType> struct container_gen<collected_vecS, ValueType> { typedef vector<ValueType,gc_allocator<ValueType> > type; }; template <class ValueType> struct container_gen<collected_listS, ValueType> { typedef list<ValueType,gc_allocator<ValueType> > type; }; template <> struct parallel_edge_traits<collected_vecS> { typedef allow_parallel_edge_tag type; }; template <> struct parallel_edge_traits<collected_listS> { typedef allow_parallel_edge_tag type; }; namespace detail { template <> struct is_random_access<collected_vecS> { enum { value = true }; typedef true_type type; }; } } typedef adjacency_list<collected_vecS, collected_vecS, directedS, no_property, no_property, no_property, collected_listS> graph; int main() { // leaks... while(true){ graph * g=new (UseGC) graph; for(unsigned int i=0; i<100; ++i){ add_vertex(*g); } for(unsigned int i=0; i<100; ++i){ for(unsigned int j=0; j<100; ++j){ add_edge(i,j,*g); } } } }

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Simply including boost/bind.hpp causes compilation error
by Ken Smith 28 Aug '08

28 Aug '08

Here is my environment. % g++ -v Using built-in specs. Target: i686-apple-darwin9 Configured with: /var/tmp/gcc/gcc-5483~1/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=i686-apple-darwin9 --with-arch=apple --with-tune=generic --host=i686-apple-darwin9 --target=i686-apple-darwin9 Thread model: posix gcc version 4.0.1 (Apple Inc. build 5483) Boost 1.35.0 (also produced same issue with Boost 1.34.1) Here is the code. 1 #include <boost/lambda/lambda.hpp> 2 #include <boost/lambda/construct.hpp> 3 #if defined(INCLUDE_BOOST_BIND) 4 # include <boost/bind.hpp> 5 #endif 6 #include <iostream> 7 #include <iterator> 8 #include <algorithm> 30 31 int main() 32 { 33 using namespace std; 34 using namespace boost::lambda; 35 36 typedef std::istream_iterator<int> in; 37 std::for_each(in(std::cin), in(), std::cout << (_1 * 3) << " " ); 76 } (The astute reader will note discontinuity in the line numbering. This is a playground for my exploration with boost. All elided lines are #if 0'ed. Here is the compile command line and the compilation error, both edited for clarity. g++ -c -g -Wall -fexceptions -DINCLUDE_BOOST_BIND -I/path/to/boost-1.35.0/include main.cpp -o main.o main.cpp: In function 'int main()': main.cpp:37: error: '_1' was not declared in this scope I have seen these related articles from the archives of this list but none of the suggestions eliminated the error. I added the inclusion of boost/lambda/construct.hpp per one of the suggestions there. Its inclusion or exclusion doesn't change the behavior. http://thread.gmane.org/gmane.comp.lib.boost.user/35128 http://thread.gmane.org/gmane.comp.lib.boost.user/16630 http://thread.gmane.org/gmane.comp.lib.boost.user/16887 As you may imagine, the elided (and commented out) lines contain actual uses of boost/bind.hpp but it is a mystery to me that simple inclusion of a header file would cause otherwise working code to stop compiling. This compile command (same as above but with -D removed): g++ -c -g -Wall -fexceptions -I/path/to/boost-1.35.0/include main.cpp -o main.o runs to completion and the subsequent link is successful. Any ideas? Thanks in advance, Ken

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[Boost.Test] Looking for Workaround: Subprocesses exiting with 0 reported as fatal error
by Florian Winter 20 Aug '08

20 Aug '08

Hi, Using Boost.Test version 1.35.0, we have run into the following bug http://svn.boost.org/trac/boost/ticket/1723 Is there an easy way to work around or fix this problem in Boost 1.35.0 (such as a patch), so we are not forced to upgrade to the SVN version of Boost.Test? Unfortunately, not starting a sub process is not an option, because it is not our software that starts the sub process but some additional library that we use. In case we have to upgrade to the SVN version of Boost, is there a recent SVN revision or tag that you would consider stable and recommend for use? Thanks in advance for any help. best regards, Florian

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What should I do to switch my legacy application to use boost smart pointers
by Meryl Silverburgh 18 Aug '08

18 Aug '08

Hi, I have a legacy application in C++, and I would like to switch it to use boost smart pointers. Can you please tell me what is the best approach for the switch? This application uses stl vector as the class container, vector<MyClass*> function which takes in MyClass* void f1(MyClass* aMyClass) { ...} function which returns MyClass* MyClass* f1() { return new MyClass(); } I am thinking just global replace all MyClass* with MyClassPtr And then put in a common .h file typedef MyClassPtr shared_ptr<MyClass> Will this approach work? Thank you for any tips.

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[proto] latest code and docs?
by Markus Werle 07 Aug '08

07 Aug '08

Hi! I am looking for the latest and greatest working version of proto and especially the proto docs in pdf and/or html. Where can I find it and when will it be included into boost? Btw.: Is there a canonical place where accepted libraries can be found *with generated docs*? Actually I have no svn access due to a firewall ... Thanks for any extra support. Markus

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[Graph] depth_first_search and specifying the edge order
by David Walthall 07 Aug '08

07 Aug '08

Hello. I have a graph that I'd like to run a depth first search on. Is it possible to control the order that edges for each node are traversed? I read through the documentation, but I didn't see anything that would do this. Thanks, David

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boost on apple gcc 4.2
by Daniel Oberhoff 07 Aug '08

07 Aug '08

Hi, Has anyone successfully used boost with the "new" apple gcc 4.2? I would like to since gcc42 has openmp, but I cant seem to be able to use boost. I compiled and installed boost with apple gcc 4.2 by directly using bjam with --toolset=darwin-4.2. When I try to use it I get an error (detailed output of gcc below) which hints towards problems with inline assembly. Actually, to get it compiled at all I had to set -fasm-blocks. Am I missing a flag of sorts? Or is it "just" another woe with apple's modified assembler? Daniel error message of gcc4.2 with boost::filesystem: In file included from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base.hpp:32, from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/shared_count.hpp:29, from /opt/boost-gcc4.2/include/boost-1_35/boost/shared_ptr.hpp:28, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem/path.hpp:19, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem/operations.hpp:17, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem.hpp:16, from mmm_fileloader.hpp:12, from mmm_tool_gui.hpp:5, from mmm_tool_gui.cpp:1: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_exchange_and_add(int*, int)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:46: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘void boost::detail::atomic_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:62: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_conditional_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:88: error: expected `)' before ‘:’ token In file included from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base.hpp:32, from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/shared_count.hpp:29, from /opt/boost-gcc4.2/include/boost-1_35/boost/shared_ptr.hpp:28, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem/path.hpp:19, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem/operations.hpp:17, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem.hpp:16, from mmm_fileloader.hpp:12, from mmm_tool_gui.hpp:5, from mmm_tool_2.cpp:3: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_exchange_and_add(int*, int)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:46: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘void boost::detail::atomic_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:62: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_conditional_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:88: error: expected `)' before ‘:’ token In file included from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base.hpp:32, from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/shared_count.hpp:29, from /opt/boost-gcc4.2/include/boost-1_35/boost/shared_ptr.hpp:28, from /opt/boost-gcc4.2/include/boost-1_35/boost/archive/shared_ptr_helper.hpp:23, from /opt/boost-gcc4.2/include/boost-1_35/boost/archive/polymorphic_iarchive.hpp:161, from mmm_tool_net.hpp:8, from mmm_tool_net.cpp:1: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_exchange_and_add(int*, int)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:46: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘void boost::detail::atomic_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:62: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_conditional_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:88: error: expected `)' before ‘:’ token

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how to know if a type supports comparison operators
by frederic.bron＠alcan.com 06 Aug '08

06 Aug '08

I am looking for a means to know if a type supports comparison operators (<, >, <=, >=). I have looked in Boost.TypeTraits but could not find what I need. F. Bron Avis : Ce message et toute pièce jointe sont la propriété d'Alcan et sont destinés seulement aux personnes ou à l'entité à qui le message est adressé. Si vous avez reçu ce message par erreur, veuillez le détruire et en aviser l'expéditeur par courriel. Si vous n'êtes pas le destinataire du message, vous n'êtes pas autorisé à utiliser, à copier ou à divulguer le contenu du message ou ses pièces jointes en tout ou en partie. Notice: This message and any attachments are the property of Alcan and are intended solely for the named recipients or entity to whom this message is addressed. If you have received this message in error please inform the sender via e-mail and destroy the message. If you are not the intended recipient you are not allowed to use, copy or disclose the contents or attachments in whole or in part.

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