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[boost] [chrono] v0.4 New thread_clock
by vicente.botet 14 Mar '10

14 Mar '10

Hi, I'm pleased to announce the version 0.4 of the Boost.Chrono library. The implementaton is stable, I don't plan to add more features before review. I'll concentrate in improving the documentation and the tests. I know that review managers are hard to find, so if you are interested in the library, please contact me or the Review Wizards. The library can be downloaded from http://www.boostpro.com/vault/index.php?action=downloadfile&filename=chrono… and the documentation is online on the sandbox http://svn.boost.org/svn/boost/sandbox/chrono/libs/chrono/doc/html/index.ht…. New Features since v0.3.2: * Suspendible Clock concept + template class suspendible_clock<> * Added scope_suspend which do suspend/resume if the Clock is a model of Suspendible Clock concept, and nothing otherwise. * thread_clock support on platforms providing it natively. * Added support for wide character for stopwatch_reporter, stopclock, and stopclock_accumulator. * digital_time renamed t24_hours Perf * Added performances measures. Bug Fixes * Bug on timeval_demo. time_point t(duration(xtime(0))); // this was taken as a function declaration gettimeofday((timeval*)&t, 0); return t; time_point t(duration(xtime(0))); // this was taken as a function declaration gettimeofday((timeval*)&t, 0); return t; by timeval tv; gettimeofday(&tv, 0); xtime xt( tv.tv_sec, tv.tv_usec); return time_point(duration(xt)); * Bug on run_timer_test (add a global variable to avoid optimization that removes completely the code to be measured Best regards, _____________________ Vicente Juan Botet Escribá

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ranking of ublas vector
by Kraus Philipp 14 Mar '10

14 Mar '10

Hello, I have a very large non sparse ublas vector (most long double content). I would like to sort this vector without change the vector content, but I know the rank of the elements like the smalest element in the vector is the 312 element in the original vector (for example). Is there a boost implementation for create ranking of elements? Thanks Phil

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boost.units converting double tp SI prefix
by Olaf Peter 13 Mar '10

13 Mar '10

Hi, is there a way to use boost.units to convert a double automatically to a SI unit prefix, e.g. 10e-3 to 10m or 10e3 to 10k ?? The value isn't know at compile time, so the decision has to be done on runtime. Thanks, Olaf

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[Boost.Intrusive] Compilation error with Visual Studio 2008
by info-tibo 13 Mar '10

13 Mar '10

Hello, For a project, I created a class allowing to reference some objects, and I use Boost.Intrusive. I started coding this class using Code::Blocks and gcc 3.4.5 . But now I want to use Visual Studio 9, and I simply added the class to the project. And then... it doesn't compile... The code is here : ----------------------------------------------------------------------------------------------------------------------------------------- #ifndef _BASE_EQUALREFSYSTEM_H_ #define _BASE_EQUALREFSYSTEM_H_ #include <boost/intrusive/list.hpp> namespace base { //! Convenient typedef typedef boost::intrusive::list_member_hook< boost::intrusive::link_mode<boost::intrusive::normal_link> > EqualRefSysHook; //! A class to handle self referencing systems /** Each object can point to a target, in order to interact with it. How to use: \code // First, you have to derivate this class class MyClass : public EqualRefSystem { // code... } // Then you can, in your main function, create these objects: MyClass* myClassPointer = new MyClass; // for example: repeated 200 times // Afterthat, you can point each object to another. When you have finished // you can simply call: delete myClassPointer; \endcode **/ class EqualRefSystem { public: //! The hook used by the intrusive list ReferencedBy EqualRefSysHook ERSMemberHook; public: //! Constructor EqualRefSystem() :Target(0),RefCount(0) {} //! Destructor /** Safe destructor : all references and target are reseted. **/ virtual ~EqualRefSystem() { resetTarget(); unlink(); } //! Returns the targeted object /** \return A pointer to the object targeted by this EqualRefSystem. **/ inline EqualRefSystem* getTarget() const { return Target; } //! Sets the target /** \param tgt : The new target. 0 means 'no target'. If tgt == this, the target is set to 0. This function is stable and very fast, you can use it without any restriction. **/ inline void setTarget(EqualRefSystem* tgt) { if(tgt == Target) return; if(tgt == this) tgt = 0; if(Target) Target->dereference(this); Target = tgt; if(Target) Target->reference(this); } //! Resets the target /** This function is a synonym for setTarget(0). **/ inline void resetTarget() { if(Target) Target->dereference(this); Target = 0; } //! Returns whether a target is set or not /** This function is a synonym for (getTarget() != 0). \return True if a target is set, else false. **/ inline bool hasTarget() const { return Target != 0; } //! Unlink from all objects which targets this one /** This function resets the target of all objects targeting this EqualRefSystem. **/ inline void unlink() { while(!ReferencedBy.empty()) ReferencedBy.begin()->resetTarget(); RefCount = 0; } //! Returns the number of objects targeting this one /** \return The number of objects targeting this EqualRefSystem. Constant-time. **/ inline unsigned int getNumberOfReferences() const { return RefCount; } private: //! Reference an object in this EqualRefSystem inline void reference(EqualRefSystem* toRef) { if(!toRef || toRef == this) return; ReferencedBy.push_back(*toRef); RefCount++; } //! Dereference an object from this EqualRefSystem inline void dereference(const EqualRefSystem* toDeref) { if(!toDeref || toDeref == this) return; ReferencedBy.erase(ReferencedBy.iterator_to(*toDeref)); RefCount--; } //! Targeted object EqualRefSystem* Target; //! Objects that reference this EqualRefSystem boost::intrusive::list< EqualRefSystem, boost::intrusive::member_hook<EqualRefSystem,EqualRefSysHook,&EqualRefSystem::ERSMemberHook>, boost::intrusive::constant_time_size<false> > ReferencedBy; //! Number of references unsigned int RefCount; }; } #endif // _BASE_EQUALREFSYSTEM_H_ ----------------------------------------------------------------------------------------------------------------------------------------- VCC told me 42 errors, all related to the first one: line 112 : C2327: 'base::EqualRefSystem::ERSMemberHook' : is not a type name, static, or enumerator I searched the doc about the C2327, but it doesn't helped me. Thanks in advance, Darktib PS: I apologize for my english, I'm french.

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BOOST_STATIC_CONST
by Olivier Tournaire 13 Mar '10

13 Mar '10

Hi all, I am currently having problem with a static const class member (in a header only project): // type.hpp template< typename Property > struct property_base { typedef Property type; }; struct some_type : property_base< uint32_t > { BOOST_STATIC_CONSTANT( type, first_value = 1 ); BOOST_STATIC_CONSTANT( type, second_value = 2 ); }; // main.cpp #include "type.hpp" ... int main(int argc, char** argv) { BOOST_CHECK_EQUAL( 1 , some_type::first_value ); } This produces a link error (g++ 4.3.4): undefined reference to some_type::first_value. Everything is fine with visual ... If I add const some_type::type some_type::first_value; after the struct definition, it compiles and links fine. However, would it produce a multiple definition link error in some cases? Could you please help? Regards, Olivier

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Unit Test Framework Documentation
by Olaf Peter 13 Mar '10

13 Mar '10

Hi, mabye an failure on the docs (or even my), but shouldn't the links on http://www.boost.org/doc/libs/1_42_0/libs/test/doc/html/utf/testing-tools/r… point to the documentation to the approbiate Macros?? Thanks, Olaf

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[serialization] stream error when reading simple tree structure from a binary archive
by CurieCat 13 Mar '10

13 Mar '10

Hi, I tried to save a tree structure out to an archive and then read it back. If I use a text archiver, everything works fine; If I use a binary archiver, an exception of "stream error" is thrown. I managed to shorten my code as following. Can anyone give some advice? I'm using vs2008 and boost 1.42.0. Thanks. /////////////////////////////////////////////////////////////////////// #define _SCL_SECURE_NO_WARNINGS #define _CRT_SECURE_NO_WARNINGS #include <fstream> #include <boost/archive/tmpdir.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/assume_abstract.hpp> #include <boost/serialization/export.hpp> class Base { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version){} public: virtual ~Base(){} }; BOOST_CLASS_EXPORT_GUID(Base, "Base") class Node : public Base { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & boost::serialization::base_object<Base>(*this); ar & parent_; ar & firstChild_; ar & nextSibling_; } public: Node* parent_; Node* firstChild_; Node* nextSibling_; Node() { parent_ = NULL; firstChild_ = NULL; nextSibling_ = NULL; } virtual ~Node(){}; bool AddChild_front(Node* node) { node->nextSibling_ = firstChild_; node->parent_ = this; firstChild_ = node; return true; } }; BOOST_CLASS_EXPORT_GUID(Node, "Node") class DeriveNode : public Node { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & boost::serialization::base_object<Node>(*this); } }; BOOST_CLASS_EXPORT_GUID(DeriveNode, "DeriveNode") int main() { Node* root = new Node; Node* bodyNode = new Node; root->AddChild_front(bodyNode); Node* headNode = new Node; Node* Eye = new Node; Node* Nose = new Node; Node* Ear = new Node; headNode->AddChild_front( Eye); headNode->AddChild_front( Nose); headNode->AddChild_front( Ear); bodyNode->AddChild_front(headNode); Node* LeftArm = new Node; Node* RightArm = new Node; Node* LeftLeg = new Node; bodyNode->AddChild_front( LeftArm); bodyNode->AddChild_front( RightArm); bodyNode->AddChild_front( LeftLeg); DeriveNode* jointRoot = new DeriveNode; bodyNode->AddChild_front( jointRoot); DeriveNode* jointChild_A = new DeriveNode; jointRoot->AddChild_front( jointChild_A); DeriveNode* jointChild_B = new DeriveNode; jointRoot->AddChild_front( jointChild_B); const Node* rootnode = root ; Node* newroot = NULL; std::ofstream ofs("filename"); { boost::archive::binary_oarchive oa(ofs); oa << rootnode; } ofs.close(); std::ifstream ifs("filename"); { boost::archive::binary_iarchive ia(ifs); ia >> newroot; } ifs.close(); return 0; }

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check MPI support
by Kraus Philipp 13 Mar '10

13 Mar '10

Hello, I work for a long time again with C + + and some numerical methods must be implemented with the help of the boost, among other things, with MPI. Does the Booster precompiler flag that I can verify that the boost is compiled with MPI support like: #if defined(BOOST_WITH_MPI) #endif Thanks for help Phil

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strange "fatal errors" with Boost.Test
by Christoph Groth 13 Mar '10

13 Mar '10

Dear boost experts, while adding regression tests to my project I experience very strange errors. I am using boost 1.40 and g++ 4.4 as packaged in Debian testing. The problem is that a very simple test suite, one which does almost nothing, produces the following runtime error: ################################################################ cwg@argo:/tmp/lg-bug$ ./test_all Running 1 test case... unknown location(0): fatal error in "sq_dist": signal: illegal operand; address of failing instruction: 0x00410106 *** 1 failure detected in test suite "lg" ################################################################ A quite minimal program which allows me to reproduce the bug is available from http://ilorentz.org/~cwg/lg-bug.tar.gz This is how I can reproduce it on any of my two Debian testing systems. The problem does not appear on an Ubuntu system to which I have access (with boost 1.38, but I do not think that this problem is specific to some boost version). ################################################################ cwg@argo:/tmp$ wget -q http://ilorentz.org/~cwg/lg-bug.tar.gz cwg@argo:/tmp$ tar xfz lg-bug.tar.gz cwg@argo:/tmp$ cd lg-bug/ cwg@argo:/tmp/lg-bug$ g++ -g -o test_all test_glass.cc glass.cc cwg@argo:/tmp/lg-bug$ gdb test_all GNU gdb (GDB) 7.0.1-debian Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /tmp/lg-bug/test_all...done. (gdb) run Starting program: /tmp/lg-bug/test_all Running 1 test case... Program received signal SIGILL, Illegal instruction. 0x0000000000410106 in boost::itest::expectations_logger::data_flow (this=Cannot access memory at address 0x3fdffffffffffe38 ) at /usr/include/boost/test/impl/logged_expectations.ipp:188 188 BOOST_CHECK_EQUAL( *tit, DATA_SIG ); ++tit; (gdb) bt #0 0x0000000000410106 in boost::itest::expectations_logger::data_flow (this=Cannot access memory at address 0x3fdffffffffffe38 ) at /usr/include/boost/test/impl/logged_expectations.ipp:188 Cannot access memory at address 0x3fe0000000000008 ################################################################ The test case (file test_glass.cc) is just: ################################################################ #define BOOST_TEST_MODULE lg #include <boost/test/included/unit_test.hpp> #include "defs.hh" #include "glass.hh" BOOST_AUTO_TEST_CASE(sq_dist) { Levy::Vecd a(2, 1); Levy::Glass sys(Levy::Vecd(1, 1), Levy::Vecb(true, true)); } ################################################################ The two constructors in the body of the testcase do not really do anything except initializing a few numbers and std::vectors. However, the bug disappears when I comment out one of these lines. The backtrace (see log) is not really helpful to me... This is the backtrace of the problem as it appears in my full program: ################################################################ Program received signal SIGSEGV, Segmentation fault. 0x0000000000432728 in ~lazy_ostream_impl (this=0xffffccc0, __in_chrg=<value optimized out>) at /usr/include/boost/test/utils/lazy_ostream.hpp:64 64 class lazy_ostream_impl : public lazy_ostream { (gdb) bt #0 0x0000000000432728 in ~lazy_ostream_impl (this=0xffffccc0, __in_chrg=<value optimized out>) at /usr/include/boost/test/utils/lazy_ostream.hpp:64 #1 0x000000000041010f in expectations_logger (this=0x6f3730, log_file_name=..., test_or_log=false) at /usr/include/boost/test/impl/logged_expectations.ipp:87 #2 0x0000000000475c66 in boost::unit_test::ut_detail::invoker<boost::unit_test::ut_detail::unused>::invoke<void (*)()> (this=0x7fffffffceaf, f=@0x6f2a08) at /usr/include/boost/test/utils/callback.hpp:56 #3 0x00000000004718e5 in boost::unit_test::ut_detail::callback0_impl_t<boost::unit_test::ut_detail::unused, void (*)()>::invoke (this=0x6f2a00) at /usr/include/boost/test/utils/callback.hpp:89 #4 0x000000000043b773 in boost::unit_test::callback0<boost::unit_test::ut_detail::unused>::operator() (this=0x6f2ad0) at /usr/include/boost/test/utils/callback.hpp:118 #5 0x000000000042ec4f in operator() (this=0x6f7378) at /usr/include/boost/test/impl/unit_test_monitor.ipp:41 #6 0x000000000042ec32 in invoke<boost::unit_test::<unnamed>::zero_return_wrapper_t<boost::unit_test::callback0<boost::unit_test::ut_detail::unused> > > (this=0x7fffffffcf3f, f=...) at /usr/include/boost/test/utils/callback.hpp:42 #7 0x000000000042ec13 in invoke (this=0x6f7370) at /usr/include/boost/test/utils/callback.hpp:89 #8 0x0000000000443257 in boost::unit_test::callback0<int>::operator() (this=0x7fffffffdb60) at /usr/include/boost/test/utils/callback.hpp:118 #9 0x000000000043b872 in boost::detail::do_invoke<boost::scoped_ptr<boost::detail::translate_exception_base>, boost::unit_test::callback0<int> > (tr=..., F=...) at /usr/include/boost/test/impl/execution_monitor.ipp:244 #10 0x000000000040f156 in boost::execution_monitor::catch_signals (this=0x6f1d00, F=...) at /usr/include/boost/test/impl/execution_monitor.ipp:956 #11 0x000000000040f21a in boost::execution_monitor::execute (this=0x6f1d00, F=...) at /usr/include/boost/test/impl/execution_monitor.ipp:1282 #12 0x0000000000418eee in boost::unit_test::unit_test_monitor_t::execute_and_translate (this=0x6f1d00, tc=...) at /usr/include/boost/test/impl/unit_test_monitor.ipp:69 #13 0x00000000004311ee in boost::unit_test::framework_impl::visit (this=0x6f1340, tc=...) at /usr/include/boost/test/impl/framework.ipp:150 #14 0x000000000041d587 in boost::unit_test::traverse_test_tree (tc=..., V=...) at /usr/include/boost/test/impl/unit_test_suite.ipp:193 #15 0x000000000041daff in boost::unit_test::traverse_test_tree (id=65536, V=...) at /usr/include/boost/test/impl/unit_test_suite.ipp:232 #16 0x000000000041d748 in boost::unit_test::traverse_test_tree (suite=..., V=...) at /usr/include/boost/test/impl/unit_test_suite.ipp:207 #17 0x000000000041db1c in boost::unit_test::traverse_test_tree (id=1, V=...) at /usr/include/boost/test/impl/unit_test_suite.ipp:234 #18 0x000000000040ab87 in boost::unit_test::framework::run (id=1, continue_test=true) at /usr/include/boost/test/impl/framework.ipp:436 #19 0x0000000000418c5c in boost::unit_test::unit_test_main (init_func=0x41eed8 <init_unit_test_suite(int, char**)>, argc=1, argv=0x7fffffffe378) at /usr/include/boost/test/impl/unit_test_main.ipp:185 #20 0x0000000000418e56 in main (argc=1, argv=0x7fffffffe378) at /usr/include/boost/test/impl/unit_test_main.ipp:237 ################################################################ When I add change some irrelevant code the program which just shifts everything a bit the backtrace becomes different or the error disappears. So it looks like some memory corruption problem. But I'm clueless... Thank you in advance for any hints Christoph

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boost.python class constructor error
by hitesh dhiman 13 Mar '10

13 Mar '10

Hi all, I'm trying out boost.python to use c++ code in python. My problem is this: In my c++ code, if i declare the class constructor in the header file, and define it in the cpp file, bjam throws a LNK2019 unresolved symbol error. The problem does not occur if i define the constructor in the header file itself. My code is shown below: *Test1.h:* #include <windows.h> //using namespace std; class World { public: World(); ~World(); void set(std::string msg) { this->msg = msg; } std::string greet() { return msg; } std::string msg; }; *Test1.cpp:* #include "Test1.h" World::World() {}; World::~World() {}; int addition(int a, int b) { int z = a + b; return z; } *Wrapper File*: #include <boost/python.hpp> #include "Test1.h" BOOST_PYTHON_MODULE(hello) { using namespace boost::python; class_<World>("World") .def("greet", &World::greet) .def("set", &World::set) ; } Is this a bug? Or there's something wrong with my coding here? -- Regards, Hitesh Dhiman Electrical Engineering National University of Singapore

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