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

[1.34.0] VC8 Express Compilation
by Ovanes Markarian 16 May '07

16 May '07

Hi all! I have a question, does someone know how the build script finds out where the Platform SDK is installed? Visual C++ Express Edition does not come bundled with a platform SDK, so it must be installed separately (MS setup does not offer to install it under Visual C++ dir) and in my case I get some errors when compiling the threading library. Should I explicitly specify include directories for the Platform SDK in the bjam command line? Many thanks, Ovanes

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[Boost.Test] shared lib (.so) has no main(), static (.a) does
by Chris Uzdavinis 16 May '07

16 May '07

Hi, I'm trying out boost 1.34 and running into some troubles getting my test programs to link. They were working fine with 1.33.1, and rebuilding with 1.34 now fails to find "main" in the boost unit test framework library. After a little investigation, I found that the .so does not have main() in it, but the .a does. System: suse linux 9.1 compiler: g++ 3.3.3 boost version: 1.34 I built boost by simply issuing: ./configure && make && make install I've searched for hints what may have changed or why it's no longer working (that is, what I'm doing wrong) but I just don't see any relevant documentation. The most suspicious part is the difference from the shared library and the archive file. $ nm -a /usr/local/lib/libboost_unit_test_framework-gcc33-mt-d.so | grep main 00077498 d DW.ref._ZTISt12domain_error 000582b8 t _GLOBAL__I__ZN5boost9unit_test49_GLOBAL__N_libs_test_src_unit_test_main.cppiMDvta17results_collectorE 00000000 a unit_test_main.cpp 00057f68 T _ZN5boost9unit_test14unit_test_mainEPFbvEiPPc 00082bd0 B _ZN5boost9unit_test49_GLOBAL__N_libs_test_src_unit_test_main.cppiMDvta17results_collectorE 00077408 V _ZTISt12domain_error 000727b8 V _ZTSSt12domain_error $ $nm -a /usr/local/lib/libboost_unit_test_framework-gcc33-mt-d.a | grep main 00000000 V _ZTISt12domain_error 00000000 V _ZTSSt12domain_error unit_test_main.o: 000002bc t _GLOBAL__I__ZN5boost9unit_test49_GLOBAL__N_libs_test_src_unit_test_main.cpprMsLbd17results_collectorE 00000210 T main 00000000 a unit_test_main.cpp 00000000 T _ZN5boost9unit_test14unit_test_mainEiPPc 00000000 B _ZN5boost9unit_test49_GLOBAL__N_libs_test_src_unit_test_main.cpprMsLbd17results_collectorE $ For a simple example: #define BOOST_TEST_MAIN #include <boost/test/unit_test.hpp> BOOST_AUTO_TEST_CASE(mytest) { } $g++ mytest.cpp -I $BOOST_HDRDIR -L $BOOST_ROOT/lib -lboost_unit_test_framework-gcc33-mt-d /usr/lib/gcc-lib/i586-suse-linux/3.3.3/../../../crt1.o(.text+0x18): In function `_start': ../sysdeps/i386/elf/start.S:98: undefined reference to `main' collect2: ld returned 1 exit status Suggestions welcome. Thanks. Chris

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Link error with test boost.signals app (boost::throw_exception?)
by Nicholas Bastin 16 May '07

16 May '07

I'm trying to build a small test program for boost.signals on my windows machine, and I get the following linker error (code below): test.obj : error LNK2019: unresolved external symbol "void __cdecl boost::throw_exception(class exception const &)" (?throw_exception@boost@@YAXAEBVexception@@@Z) referenced in function main My command line is: icl /I. test.cpp /link /LIBPATH:./stage/lib Test.cpp is: #include <boost/signal.hpp> #include <iostream> void hello (void) { std::cout << "Hello, world!" << std::endl; } int main(void) { boost::signal<void ()> sig; sig.connect(&hello); sig(); return 0; } -- Nick

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DeSerialization to update content of object instead of construct new object
by Ng Pan 16 May '07

16 May '07

Hi I am using boost serialization to synchronise objects between different computers (network). The objects would be serializated as a string instead of a file by using the class stringstream(instead of fstream). The string would be transferred via TCP/IP layer. Let simpify the situation as only two computers (Master and Slave) ,both of two computers have N objects and I wanna synchronise their content. I create a vector of pointer ( std::vector<base *> m_vpBase ) which points to the dirty objects. Both of two computers have this vector. Let assume the vectors are already pointing to the corresponding objects. For Tx side, it would serialize the objects as a string. For Rx side, I want to update the content of the objects that its vector is pointing to. Tx side: oa << BOOST_SERIALIZATION_NVP(m_vpBase); Rx side: oa >> BOOST_SERIALIZATION_NVP(m_vpBase ); However, the above code would construct new objects. What i want is just update the content of the objects , not construct new objects. I know how to update the content for one object by using pointer ( base * m_pBase). Tx side: oa << BOOST_SERIALIZATION_NVP(m_pBase); Rx side: oa >> BOOST_SERIALIZATION_NVP(*m_pBase); But, I don't know how to do for a vector of pointer. If you know, please give me some hints. Thank you very much. Regards Barr Ng [I found Boost serialization is useful and easy to use. ] _________________________________________________________________ No masks required! Use MSN Messenger to chat with friends and family. http://go.msnserver.com/HK/25382.asp

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[date_time] Construct a time_period a year long
by Ken Klose 15 May '07

15 May '07

I'm want to represent a period of time of 1 year starting at the current ptime and ending at the corresponding ptime a year from now. I've tried this: boost::posix_time::time_period _time_period( boost::posix_time::second_clock::local_time(), boost::gregorian::years(1) ); However I get this error: error: no matching function for call to `boost::date_time::period<boost::posix_time::ptime, boost::posix_time::time_duration>::period(boost::posix_time::ptime, boost::gregorian::years)' Any thoughts on how to solve my problem? Thanks, Ken

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How can I loop thru a vector backward?
by Meryl Silverburgh 15 May '07

15 May '07

Hi, I use boost library with for_each to loop thru my vector. for_each(myVector.begin(),myVector.end(), bind ( &MyClass::aFunc, this, _1) ); Can you please tell me how can i loop thru the same list in reverse? Thank you.

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Building bjam 1.34 on vc8 64bit?
by Nicholas Bastin 15 May '07

15 May '07

When I try to build bjam 1.34 with "build vc8", I get a TON of the following errors: LIBCMTD.lib(<xxx>.obj) : error LNK2001: unresolved external symbol __security_check_cookie (Happens on a bunch of bjam objs too) I presume this is because of the "safe" vc8 runtime, but how do I get around this issue? I presumed the vc8 toolset would take this into account, but it apparently does not. Is there some way to pass defines to build.bat? -- Nick

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gcc automatic linking
by Pascal Patry 15 May '07

15 May '07

Hi, I'm currently experiencing an issue with Boost 1.34.0 and gcc 4.1.1. I'm depending on boost_filesystem from my program for some operations. When using boost 1.33.1, I was able to link against libboost_filesystem-[...].a only by doing -lboost_filesystem and by including the stage/libs directory of boost. Now, if I don't modify anything, I'm getting linker errors. The current workaround is to put '-lboost_filesystem-gcc41' or to rename libboost_filesystem-gcc41.a to libboost_filesystem.a The thing is, everytime I'm using other stuff from boost requiring linking against a library, I'll have to rename the library on my workstation or modify the Makefile... So, I'd like to know if there is anything else I can do to fix this automatic linker problem. Thank you, Pascal

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Re: [Boost-users] Entire iostreams library outdated in 1.34.0?
by Anders Dalvander 15 May '07

15 May '07

If Turkanis is nowhere to be found someone should really look at all the bugs assigned to him. http://svn.boost.org/trac/boost/query?status=new&status=assigned&status=reo… 484 Boost.Iostreams and newline translation 525 problem with boost::iostreams when compiled with Visual C++ 579 boost.iostreams file_descriptor and sharing 586 iostreams // file_descriptor::seek BUG on files > 4 GB 699 Changing size of memory-mapped file on Windows 786 bug in iostreams/copy.hpp line 81 791 iostreams::tee_filter is for output only 817 Performance problem in iostreams 822 Incorrect usage of bad_write(), bad_seek() etc. 856 iostreams file_descriptor::write fails under Win32 869 [iostreams] patch for building by BBv2 // Anders

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boost date_time
by Aljaz 15 May '07

15 May '07

Hello I want to output current date/time on my computer including timezone in this format: Date: Tue, 15 May 2007 09:21:48 -0400 -0400 is a timezone Im not really familiar with timezones and I could not understand the documentation how to output local timezone this way. Basically I just want to output local timezone on computer.. Heres what I have so far: #include <boost/date_time/posix_time/posix_time.hpp> #include <boost/date_time/local_time/local_time.hpp> #include <boost/date_time/local_time/posix_time_zone.hpp> #include <boost/date_time/date_facet.hpp> #include <ctime> #include <locale> #include <memory> #include <sstream> #include <boost/shared_ptr.hpp> std::string mystrftime(const std::string format, time_t time, const std::locale& locale = std::locale::classic()) { boost::shared_ptr<boost::local_time::time_zone> tz(new boost::local_time::posix_time_zone("dont know what to put here")); boost::local_time::local_date_time dt(boost::posix_time::from_time_t(time), tz); boost::local_time::local_time_facet *ff = new boost::local_time::local_time_facet(); ff->format(format.c_str()); std::stringstream s; s.imbue(std::locale(std::locale::classic(), ff)); s << dt; return s.str(); } int main () { std::cout << mystrftime("%A, %B %d, %Y %q", std::time(0)) << '\n'; } Thanks for help Regards A

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