June 2004 - Boost-users - lists.boost.org

boost::shared_ptr and stl algorithms
by Bill Eidson 15 Apr '05

15 Apr '05

std::vector< boost::shared_ptr<T> > TVec; I want to write a function object to run std::for_each. to do somework against members of T and accumulate results in functor. My attempts have failed in VC7 with memory errors in my operator() method. struct fo { bool operator()( boost::shared_ptr<T>& t ) { return true; } }; Thanks in advance bille

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Will libraries built on WinNT run on Win98? (MinGW)
by Reed Hedges 31 Mar '05

31 Mar '05

I know that Win98 is not really supported, but is there any chance that libraries (specifically thread and regex) that were build on WinNT using MinGW work on Win98 (in MinGW)? My guess is no, but has anyone tried it? thanks reed

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problem compiling with threads and stlport
by Nicholas Cain 31 Aug '04

31 Aug '04

hi, I'm new to boost, stlport and programming on linux in general, so I apologise now for any obvious beginner errors! I'm using mandrake 10 and gcc 3.3.2, and using root I created STLport 4.6.2 libraries, and then created all the boost 1.31.0 libraries using bjam -sTOOLS=gcc-stlport -sBUILD="debug release <stlport-iostream>on" install I had to have this little lot in my bashrc file to do it; export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib export STLPORT_VERSION=4.6.2 export STLPORT_ROOT=/home/ncain export STLPORT_LIB_DIRECTORY=/usr/local/lib export STLPORT_INCLUDE_DIRECTORY=/usr/local/include/ export PYTHON_VERSION=2.3 export PYTHON_ROOT=/usr Everything seemed to build ok, apart from an "../lib/libstlport_gcc_debug.so does not exist" error in the final part of the stlport build and a continual "warning: "_POSIX_C_SOURCE" redefined" warning during the boost build. Both the stlport and boost libraries are in /usr/local/lib ok, and building thread/test passed fine too. I altered one of the tutorial files to use _STL and also created a makefile (since bjam is a bit beyond me at the moment), and these appear as; testboost.cpp: #include <boost/thread/thread.hpp> #include <boost/thread/xtime.hpp> #include <iostream> using namespace _STL; struct thread_alarm { thread_alarm(int secs) : m_secs(secs) { } void operator()() { cout << "alarm sounded..." << endl; } int m_secs; }; int main(int argc, char* argv[]) { int secs = 5; thread_alarm alarm(secs); boost::thread thrd(alarm); thrd.join(); } makefile: .PHONY: all clean ALL = testboost INCS = -I"/usr/local/include/stlport" \ -I"/usr/local/include/boost-1_31" LIBS=-L"/usr/local/lib" -lstlport_gcc -lboost_thread-gcc-mt-p -lpthread .cpp: ${CXX} ${INCS} -pthread -o $@ $^ ${LIBS} all: ${ALL} clean: ${RM} core* *.o ${RM} ${ALL} make returns this error; g++ -I"/usr/local/include/stlport" -I"/usr/local/include/boost-1_31" -pthread -o testboost testboost.cpp -L"/usr/local/lib" -lstlport_gcc -lboost_thread-gcc-mt-p -lpthread /home/ncain/tmp/ccZWBPnj.o(.text+0x4b): In function `main': : undefined reference to `boost::thread::thread[in-charge](boost::function0<void, _STL::allocator<boost::function_base> > const&)' collect2: ld returned 1 exit status make: *** [testboost] Error 1 using -lboost_thread-gcc-mt-gdp makes no difference, however changing the cpp to use the std libraries works fine (builds and runs correctly). Have I made a mistake in building the boost libraries or possibly in my makefile? thanks, nik

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mpl::vector -> boost::tuple
by Markus Werle 09 Jul '04

09 Jul '04

Hi! The example in libs/mpl/example/tuple_from_list.cpp and gen_linear_hierarchy from http://aspn.activestate.com/ASPN/Mail/Message/boost/1166644 template< typename Types, typename Unit, typename Root = mpl::none > struct gen_linear_hierarchy { typedef typename mpl::fold<Types,Unit,Root> ::type type; // here }; /* usage example: template< class Base, class T > struct EventHander : public Base { virtual void OnEvent(T& obj, int eventID) = 0; }; typedef gen_linear_hierarchy< mpl::list<Window,Button,ScrollBar> , EventHander<_1,_2> > ::type v; */ all seem to me work fine with default constructible types. What I need is a type generator which provides a constructor, such that code like this one works for mpl::vectors (or other mpl::sequences) with arbitrary length: ------------- class C { C(std::string const & gaga) {} }; struct gen_linear_hierarchy_with_constructor // your idea missing here { // and here }; typedef gen_linear_hierarchy_with_constructor<mpl::vector<C, C> >::type mytuple; mytuple mt("test", "Thanks for your help"); ------------------ Markus P.S.: David and Aleksey, if you read this here: I could not find your "coming soon" book at awprofessional.com. What's the current state of the book I wait for so long already ...

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Feature request for boost::filesystem
by Delfin Rojas 07 Jul '04

07 Jul '04

Hello everybody, I'm new to this mailing list. The first thing I should say is I love boost and I think it is a great library and I'm really thankful to all its contributors. Now, that being said, I'm sending this email to ask about a feature in the boost::filesystem library that I believe would be valuable to have. Currently the only library that supports file and directory operations in boost is boost::filesystem. Thanks tot hat library I don't have to use platform specific file manipulation rutines for things like copying a file, deleting all files in a directory, iterating through a directory, etc. Now, all the operations in boost::filesystem take a boost::filesystem::path as an object encapsulating a platform independent "path" to a file or a directory. My problem is this path can only be built using a single char (ANSI) character string. This doesn't allow me to use boost::filesystem in windows with Unicode support since I cannot convert a wide string (UTF16) path to a boost::filesystem::path object. I believe it must not be too difficult to add Unicode path support to boost::filesystem since only the "path" class would need to be modified I think. Another small feature I think could be interesting is a convenience function to set the current path (cd operation). There is a function already to get the current path but not to set it. I do not know if this is the right group to ask for these features. If not please point me in the right direction. Thanks a lot Delfin Rojas Delfin(a)moodlogic.com

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Problem with boost random library.
by Joshua Little 04 Jul '04

04 Jul '04

Hi all, I'm trying to use the randome number generators but I am having some problems. I'm using boost 1.31.0 and gcc 3.2 on Windows 2000. Here is my code : printf(" Die \n "); //std::cout << "Die Rolls" << std::endl; try { boost::mt19937 rng; // produces randomness out of thin air // see pseudo-random number generators boost::uniform_int<> six(1,6); // distribution that maps to 1..6 // see random number distributions boost::variate_generator<boost::mt19937, boost::uniform_int<> > die(rng, six); // glues randomness with mapping int x = die(); printf(" Die %d\n ",x); } catch(...) { std::cout << "exception" << std::endl; printf(" Die exception \n "); } I basically copied the example code off the web site to see if I could get it to work but I'm not having any luck. If I have the variate_generator defined as above I do not not get any output to the console after the declaration of die. I tried printf's and stream output but neither works, I never see the "Die %d" printed out and I do not see either of the outputs in the catch(...) section. printed either. I even had a throw in the try block at one time to see if it could get to the catch section and did not see output. When I remove the die declaration (and comment out the code that uses it) but leave the generator and the distribution then I can see output again and if I throw after the distribution declaration then I see both output statements in the catch block. So it seems like if I have the variate generator declared then I can't see any output after that, but when I comment it out I can see output again. I'm not sure what I'm doing wrong since I am basically copying a pretty simple example from the book I just can't get it to work. Ah and just incase this makes a difference I'm running this code as a test case in a boost test suite. I wanted to try to get it to work there before putting it into my main app. Thanks, Joshua.

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boost test doesn't track validation outside auto functions
by Ross Boylan 02 Jul '04

02 Jul '04

I have a test program that looks like this, in stylized form: -------------------------- #include <boost/test/auto_unit_test.hpp> using namespace boost::unit_test_framework; void validate(X args) { if (some tests) BOOST_ERROR("message"); } BOOST_AUTO_UNIT_TEST(testfunction) { // set up arguments validate(args) } ---------------------------------- When I run this with report-level detailed, it reports that there are 0 assertions in testfunction. Furthermore, the assertions done in validate are not even added to the overall number of assertions reported for the run. I know the checks are being run, because I have seen errors from them. Also, the error messages include the name "testfunction", so it is available at run time. It would be nice if the error reporting and logging functions got their info at run-time; apparently they are grabbing it from some pre-processor magic at the moment (I haven't examined the code in detail; that's just an inference from the behavior). Since the tests do seem to be run, this is basically a cosmetic problem, but it would be nice to fix. If any easy fixes occur to anyone, I'd love to know. Boost 1.31.0 on Debian. P.S. The module's author is listed as rogeeff(a)fusemail.com in the documentation, but that address doesn't work. -- Ross Boylan wk: (415) 502-4031 530 Parnassus Avenue (Library) rm 115-4 ross(a)biostat.ucsf.edu Dept of Epidemiology and Biostatistics fax: (415) 476-9856 University of California, San Francisco San Francisco, CA 94143-0840 hm: (415) 550-1062

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Newbie question... (sorry)
by Chris 30 Jun '04

30 Jun '04

Hi all, sorry for the newbie question... I have been trying to use the boost libraries with no luck I will briefly as possible list the steps I took, so that you can let me know where I went wrong. (please bear with me) 1) I downloaded the latest version and decompressed it so that i have a "C:\boost_1_31_0 directory". 2) I built Boost.Jam by starting the Visual Studio.Net command prompt, cd'ed to the "C:\boost_1_31_0\tools\build\jam_src" directory and invoked the build.bat .... The build was succesfull. 3) Copied the bjam.exe from the "C:\boost_1_31_0\tools\build\jam_src\bin.ntx86" directory to the Vc7/bin directory. 4)Added the VC71_ROOT environment variable to windows with the "C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7" path as the value. 5) Made sure that the PATH environment variable had the Vc7\bin path in it. 6) reset. 7) Started the Visual Studio.Net command prompt, cd'ed to the "C:\boost_1_31_0" directory and invoked bjam "-sTOOLS=vc7.1" install ... the whole process started.. building was succesfull (I believe) and I had a new directory c:\Boost with the \include and \lib sub dirs as mentioned in the "Getting Started" page. 8) Started visual studio.NET, went into the menu "Tools->Options->Projects->VC++ Directories" where I set "C:\boost_1_31_0" in the list of INCLUDE directories. 9) Copied a simple example from the boost website to test the libraries, compiled and VC doesn't find one of the header files.. 10) After many, many attempts I lost it and added the "C:\boost_1_31_0\lib" and "C:\boost_1_31_0\bin" to the other list of directories in the LIBRARY and EXECUTABLE list of directories in VC. After loosing it some more (after more attempts) I added even "C:\boost" in the same places as I had done in the previous steps (just in case). Now I get this fatal error "fatal error LNK1104: cannot open file 'libboost_filesystem-vc71-sgd-1_31.lib' " It doesn't seem to find the .lib but I have checked in the boost directories and that .lib is there!!! Any suggestions.... please... I also feel really bad, 'cause it seems I am the only idiot who hasn't been able to do this :(((( If someone can help me I will gladly return the favor (if I can) Thank you very very much in advance, Chris ------------------------ "Programming is Understanding" - Kristen Nygaard (I just wish I could understand more)

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[admin] Wiki Spam -- IP's are being banned
by Jeff Garland 28 Jun '04

28 Jun '04

All - I'm cross-posting this to boost-users and the developer list since it pertains to both. Over the last couple months there has been a rise in 'spam attacks' on the Wiki. Basically people are inserting links to commercial sites on wiki pages. These sites are totally unrelated to boost, c++, etc. I thank the many boosters that have spent their precious time removing the defacements. But the time has come to crack down. The following IP ranges have been banned from the Wiki. 61.55.32.* 61.55.33.* 69.63.103.* 210.82.76.* 210.82.106.* 219.233.195.* 218.5.65.* I will be monitoring and banning additional IP addresses as needed. If I have accidentally banned someone incorrectly, please let me know offlist: jeff at crystalclearsoftware.com Thanks, Jeff

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singleton_pool
by . . 28 Jun '04

28 Jun '04

hi all, i want to use singleton_pool, but on vc6.0 i get the following error (i have vc6.0 sp5): boost\pool\simple_segregated_storage.hpp(51) : error C2248: 'object_creator' : cannot access private struct declared in class 'boost::details::pool::singleton_default<struct boost::singleton_pool<class CMate rialProxy,4,struct boost::default_user_allocator_new_delete,class boost::details::pool::win32_mutex,32>::pool_type>' e:\documents\develop\include\boost-1.30.2\boost\pool\detail\singleton.hpp(63) : see declaration of 'object_creator' e:\documents\develop\include\boost-1.30.2\boost\pool\simple_segregated_storage.hpp(51) : while compiling class-template static data member 'struct boost::details::pool::singleton_default<struct boost::singleton_pool<class CMaterialProxy,4,st ruct boost::default_user_allocator_new_delete,class boost::details::pool::win32_mutex,32>::pool_type>::object_creator boost::details::pool::singleton_default<boost::singleton_pool<CMaterialProxy,4,boost::default_user_allocator_new_delete,boost::deta ils::pool::win32_mutex,32>::pool_type>::create_object' thanks in advance Fabio --------------------------------- Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages!

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