November 2009 - Boost-users

obtaining the day of the week as a string
by Sean Farrow 22 Nov '09

22 Nov '09

Hi: Is there a way of obtaining the day ofthe week as a string in the local language using boost.datetime? If yes what is the best way of doing this? Regards Sean.

1 0

boost::interprocess container of pointers
by Mateusz Ziobro 22 Nov '09

22 Nov '09

Hi, I have a problem with container of pointers in shared memory using boost::interprocess, object created by construct method is mapped to local memory address, so I can not just put it into shared memory container because the address would be invalid in other process, probably I have to remap or use some kind of smart pointer and than put into container. My question is Does someone know how to do that? Please see following piece of code. #include <iostream> #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <boost/interprocess/containers/set.hpp> class TestData { int value_; public: TestData(int value): value_(value) { } int get_value() const { return value_; } }; int main(int argc) { using namespace boost::interprocess; managed_shared_memory mgr(open_or_create, "shm_test", 1024*1024); TestData* t1 = mgr.construct<TestData>("test_data")(99); std::cout << t1->get_value() << std::endl; //TestData* is address in local memory //we can not keep those addresses in shared memory set, would be invalid in other process //typedef allocator<const TestData*, managed_shared_memory::segment_manager> allocator; //typedef set<const TestData*, std::less<TestData*>, allocator> TestDataSet; //TestDataSet* s1 = mgr.construct<TestDataSet>("test_data_set")(std::less<TestData*>(), // mgr.get_segment_manager()); }

2 1

[Asio] serial port example doesn't work on Mac: Operation not supported, bad file descriptor
by philipp_muenzel＠web.de 22 Nov '09

22 Nov '09

Hello, I'm trying to communicate with the serial port using the example code "minicom" that was posted here: http://lists.boost.org/boost-users/att-41140/minicom.cpp On Linux, the example works flawlessly and lets me communicate with both "native" serial port hardware and USB-to-serial converted hardware with FTDI chips, which can be adressed via /dev/ttyUSB. On a Power Mac with OS Tiger, using boost 1.40 and the gcc 4.0 compiler, everytime I start the example I get the following errors: $ ./minicom.app/Contents/MacOS/minicom 57600 /dev/cu.usbserial-4B11 Error: Operation not supported Press Enter to exit Error: Bad file descriptor Press Enter to exit However, I can talk to the serial-via-usb hardware using some native socket functions, so the file descriptor itself can't be the problem. How can I get the minicom example to work on Mac also? Regards, Philipp ___________________________________________________________ Preisknaller: WEB.DE DSL Flatrate für nur 16,99 Euro/mtl.! http://produkte.web.de/go/02/

1 0

[Review] GGL Review ends today, November 22nd
by Hartmut Kaiser 22 Nov '09

22 Nov '09

Hi all, The review of the Generic Geometry Library officially ends today, November 22nd. Please send in your reviews if you have not done so yet. If you need more time for your review, please get in contact directly with me to work out some individual schedule. Regards Hartmut GGL Review Manager ------------------- Meet me at BoostCon http://boostcon.com

1 0

[Spirit.Qi] Compile Error for MiniXml/Employee example
by HT4N - 22 Nov '09

22 Nov '09

As I am considering to use Spirit.Qi for my project, I am ramping up myself through the examples given. I was able to compile the calcX examples. However, I have issues compiling Mini_XML* and Employee.cpp examples. I got the following errors: errors in directory c:\src\scratch\spirit.qi c:\src\boost141\boost\proto\extends.hpp(537) : error C2220: warning treated as error - no 'object' file generated warnings in directory c:\src\scratch\spirit.qi c:\src\boost141\boost\proto\literal.hpp(40) : warning see reference to class template instantiation 'boost::proto ::exprns_::extends<Expr,Derived,Domain>' being compiled c:\src\scratch\spirit.qi\spiritqimain.cpp(81) : warning see reference to class template instantiation 'boost::proto::utilit y::literal<T,Domain>' being compiled c:\src\scratch\spirit.qi\spiritqimain.cpp(70) : warning while compiling class template member function 'client::employee_pa rser<Iterator>::employee_parser(void)' c:\src\scratch\spirit.qi\spiritqimain.cpp(116) : warning see reference to class template instantiation 'client::employee_pa rser<Iterator>' being compiled c:\src\boost141\boost\proto\extends.hpp(537) : warning C4512: 'boost::proto::exprns_::extends<Expr,Derived,Domain >' : assignment operator could not be generated c:\src\boost141\boost\proto\literal.hpp(76) : warning C4512: 'boost::proto::utility::literal<T,Domain>' : assignm ent operator could not be generated Any help appreciated! Thanks HT _________________________________________________________________ Windows 7: It works the way you want. Learn more. http://www.microsoft.com/Windows/windows-7/default.aspx?ocid=PID24727::T:WL…

2 1

using boost::thread with Sun Studio C++ gives error
by Maróy Ákos 21 Nov '09

21 Nov '09

Hi, I'm trying to compile a code which uses the boost thread library, but I get the following error: CC -library=stlport4 -features=tmplife -features=tmplrefstatic -mt -c -o t t.cpp "/opt/boost/include/boost/thread/pthread/mutex.hpp", line 142: Error: The function "pthread_mutex_timedlock" must have a prototype. "/opt/boost/include/boost/thread/pthread/mutex.hpp", line 142: Error: The function "pthread_mutex_timedlock" must have a prototype. "/opt/boost/include/boost/thread/detail/thread.hpp", line 344: Error: boost::thread::thread(boost::thread&) is not accessible from boost::move(boost::detail::thread_move_t<boost::thread>). "/opt/boost/include/boost/thread/pthread/recursive_mutex.hpp", line 179: Error: The function "pthread_mutex_timedlock" must have a prototype. "/opt/boost/include/boost/thread/pthread/recursive_mutex.hpp", line 179: Error: The function "pthread_mutex_timedlock" must have a prototype. 5 Error(s) detected. make: *** [t] Error 5 the sample source code in question here just a single include: #include <boost/thread.hpp> This is with boost 1.40.0. I wonder what I'm doing wrong.. Akos

1 0

smart_ptr subclass as template function parameter issues with Sun Studio
by Maróy Ákos 21 Nov '09

21 Nov '09

Hi, I have the following problem, when using the Sun Studio C++ compiler and boost::smart_ptr. Consider the following code: class A {}; class B : public A {}; template<typename T> void fn(shared_ptr<A> a, T t) { } void foo() { shared_ptr<A> a; shared_ptr<B> b; fn(a, 1); fn(b, 1); } this compiles fine with a number of compilers, including gcc, icc and MS Visual Studio. But when I try to compile it using the Sun Studio compiler, I get: Error: Could not find a match for fn<T>(boost::shared_ptr<B>, int) needed in foo(). it only works if I explicitly cast the derived class' shared_ptr to that of the base class, that is, instead of: fn(b, 1); I need to use: fn((shared_ptr<A>) b, 1); which seems rather inconvenient. is the fn(b, 1); style really bad? is there a way to make the Sun compiler accept this form? Akos

1 0

BOOST-UBLAS: how to implement A.B.A^t operation.
by Arman Khalatyan 21 Nov '09

21 Nov '09

Hello, I would like to calculate for B=NxN matrix and A=N vector following operation: RES= A (dot)* *B (dot) A^T using namespace boost::numeric::ublas; matrix<double> B (2, 2); matrix<double> A(1, 2); // this works when I do step by step matrix<double> res=prod(A,B); res=prod(res,trans(B)); // but this does not compile res=prod(prod(A,B),trans(A)) // it gives error error C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>' So what is the difference with previous? Thanks Arman.

1 0

[type_traits] typedef problem on Microware/Radisys OS9
by Doug Crawford 21 Nov '09

21 Nov '09

I am trying to port parts of boost to the Microware/Radisys OS9 platform. This is really an old embedded systems C++ compiler that has not been updated since about 1997. Anyways I can get shared_ptr to work and convert between convertible types. But when I try to compile anything out of type_traits library the compiler can't handle anything like: typedef typename se_t::template type<T> helper; (line 156 in is_enum.hpp) My compiler error is "expected an identifier" at ::template. I am guessing that I am out of luck, but is there any way to rewrite or simplify these kind of constructs?

4 3

Linker not pulling in boost_system properly
by Jason Sewall 20 Nov '09

20 Nov '09

I'm having trouble with linking to an installation of Boost. I just downloaded boost_1_41_0.tar.bz2, untarred it, and did: $ ./bootstrap.sh --prefix=/home/sewall/src/boost-1.41.0 $ ./bjam --prefix=/home/sewall/src/boost-1.41.0 install Now I've got a project (using autotools+libtool) of my own making that uses a number of Boost libraries. After pointing the configure script to the right spot for the Boost libraries, I wind up with errors like the following: /bin/sh ../libtool --tag=CXX --mode=link g++ -I../sim/include -I/home/sewall/src/boost-1.41.0/include -I/usr/include/libxml2 -fopenmp -O0 -fno-inline -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-enum-compare -o xml-test xml-test.o ../sim/src/libhwm_net.la -lrt libtool: link: g++ -I../sim/include -I/home/sewall/src/boost-1.41.0/include -I/usr/include/libxml2 -fopenmp -O0 -fno-inline -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-enum-compare -o xml-test xml-test.o ../sim/src/.libs/libhwm_net.a -L/home/sewall/src/boost-1.41.0/lib -lxml2 -lz -lboost_filesystem -lboost_regex -lrt /usr/bin/ld: warning: libboost_system.so.1.41.0, needed by /home/sewall/src/boost-1.41.0/lib/libboost_filesystem.so, not found (try using -rpath or -rpath-link) /home/sewall/src/boost-1.41.0/lib/libboost_filesystem.so: undefined reference to `boost::system::get_system_category()' /home/sewall/src/boost-1.41.0/lib/libboost_filesystem.so: undefined reference to `boost::system::get_generic_category()' I don't claim to understand libtool terribly well, but I think that the xml-test target is pulling in the dependencies of libhwm_net.la, which in turn pulls in boost_filesystem and boost_regex. It seems that it boost_filesystem is then asking for libboost_system. Everything is acting as it should up to this point, but then the linker seems to be at a loss to where libboost_system can be found. If I manually add -lboost_system to the above command line, the target builds fine. Of course I can just have my configure script general -lboost_filesystem and -lboost_system whenever boost_filesystem is needed, but I suspect there's a better way to do it. Is there something I should have added to my Boost build to have it know to look for boost_system in /home/sewall/src/boost-1.41.0? Thanks, Jason P.S. I have added /home/sewall/src/boost-1.41.0 to my LD_LIBRARY_PATH, if that helps.

2 2