July 2006 - Boost-users - lists.preview.boost.org

Re: [Boost-users] [thread] Keeping leak detectors still... - Results
by Daniel Krügler 19 Jul '06

19 Jul '06

Hello, I apologize for the late response to the original thread "Re: [thread] Keeping leak detectors still..." but we had some hard time to bring the boost tests to run and I hope we did that correctly... Furtheron I would like to thank my colleague Rüdiger Dreier for his patience for doing all this testing work. Please note, that the bjam boost tests where performed twice, each one with compiler MSVC 8.00.50727.42 on Windows XP SP2 and the official release of boost 1.33.1. The only difference was that the original file libs/thread/src/tss_hooks.cpp was replaced by the version posted by Peter Dimov on 2006-07-15T18:31 (where the leading and trailing html tags have been removed). All 14 thread-related tests passed the tests for both situations. If anyone is interested in the complete test output (which includes the results of all other libs), please don't resist to ask for them (I didn't want to pollute the news group space without explicit invitation to do that...) Additionally to the boost test, we run a homegrewn, simple threading-mutex-locking test, which also passed successfully for the old and new tss_hooks.cpp version. We could also observe that the standard leak reporter did *not* choke anymore ;-) Greetings from Bremen, Daniel Krügler

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[python], [regex] Segmentation fault when deallocating match_results in a python extension module
by bernhard.maeder＠zkb.ch 19 Jul '06

19 Jul '06

Hello everybody I have a problem in a boost.python module that makes use of the boost.regex library. I'm not sure how much the problem is related to those two libraries or whether I'm just doing something wrong in the build setup. I have the following two python modules: *** test2.cpp *** #include <string> #include<boost/python.hpp> #include<boost/regex.hpp> using namespace boost; using namespace boost::python; void test_func(std::string const & in) { boost::regex expr("^(.*)\\[.*\\]$"); boost::match_results<std::string::const_iterator> match; boost::regex_match(in.begin(), in.end(), match, expr); } BOOST_PYTHON_MODULE(test2) { def("testFunc", &test_func); } *** Build command *** g++-3.4 -Wall -pthread -fPIC -I. -I/usr/include/python2.3 -c -otest2.os test2.cpp g++-3.4 -pthread -shared -o test2.so test2.os -lpython2.3 -lboost_python-gcc-mt-1_33 -lboost_regex-gcc-mt-1_33 *** test.py *** from test2 import * testFunc('justastring') *** output *** >>> from test2 import * >>> testFunc('justastring') Segmentation fault The program aborts when exiting test_func(), during deallocation of match_results. The error occurs somewhere in _M_deallocate of stl_vector.h. Can anybody help me with this problem? What could possibly go wrong here? One thing I noted: python is compiled using GCC3.3 on our system, while we are using GCC3.4, is this a problem? (But, trying the same on a system with GCC 4 for both, python and our app, also fails, so it seems like the problem is to be sought elsewhere). Thanks a lot! Bernhard

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date_time compilation errors on gcc/STLport (time_formatters.hpp)
by Sagnes, Frederic 19 Jul '06

19 Jul '06

<<log.txt>> Hello, I had some troubles compiling my software with the date_time boost library. I attached the build log, I'm using STLport 5.1.0 RC1 (but 5.0.2 has the same troubles), GCC 4.0.1, Boost 1.33.1 and Linux Mandriva 2006.0. It is related to the use of STLport streams by date_time in time_formatters.hpp. It says "ambiguous overload for 'operator<<'". I don't know if it's related to the way I compiled Boost and/or STLport, but this error is generated by the compiler, not the linker. This problem doesn't show up on Visual Studio 2003. Best regards _______________________________________________ Frédéric Sagnes, A&D AS RD DH K3 Siemens AG Karlsruhe

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Re: [Boost-users] how do I access m_property on an edge_descriptor
by Daniel Mitchell 18 Jul '06

18 Jul '06

> How do I access the m_property value of an edge_descriptor. > > I'm using an undirected graph and I need to get a unique identifier for > each edge in the graph. The vertex pair I currently use for edges create > two possible identifiers for each edge, but the m_property value of > each edge appears unique only I cannot access it. Why wouldn't you use the edge descriptor itself as the unique identifier? It should be the case that (u,v) == (v,u). D.

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Re: [Boost-users] A question about shared_ptr(Zhuo Hao)
by Zhuo Hao 18 Jul '06

18 Jul '06

But consider the following code: #include<iostream> using namespace std; class CMutex{};//Hide all the implementations for convience template<class Y> void world(Y * p) { } void hello(int *x){ } int main(){ hello(0); world<CMutex>(0); return 1; } It compiles and runs without problems.So you see I can pass zero as a pointer to Y, and as a pointer to int. That's OK. I wonder how it is implemented that we cannot pass zero as a pointer to Y in the constructor of shared_ptr. Thanks Zhuo Hao On 14/07/06, Tommy Hinks <tommy.hinks(a)gmail.com> replied: You can't pass 0 because the Type passed must be an Investment*, not just a type that could be cast to one. This is why you have to explicitly cast it yourself.

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Re: [Boost-users] [Serialization] Problem serializing via base class ptr
by Guy Létourneau 18 Jul '06

18 Jul '06

Robert, I've tried to include your changes but it doesn't solve the problem. I had to add the following line: BOOST_IS_ABSTRACT(NonVolatileData) for the program to compile. I agree with you, to have an abstract class is what is needed in that case as the NonVolatileData class is not intended to do something useful except for allowing my data storage layer to be generic. However, abstract or not, I still have the same problem: when serializing my SomeData object through a pointer to the NonVolatileData, only the data of the parent class gets serialized. Anything else you want me to try? Thanks, Guy >Try making the base class polymorphic - that it define at least >one abstract function. See my changes below. This will have >the beneficial effect of inhibiting anyone from creating an instance >of your base class directly. >Robert Ramey >Guy Létourneau wrote: >> Hello, >> >> I need to develop a generic data storage layer. Its job is to handle >> the serialization of all objects that need to be persistent in my >> system and handle management of archives, backups and restores and so >> forth. The most important point is that it must stay generic, i.e. >> have no knowledge of the type of objects being passed by other >> modules in the system. Because of this, I define a base class >> NonVolatileData from which all data classes in the system will >> derive: >> >> /////////////////////////////////////////////////////////////////////// >> // Base class >> class NonVolatileData >> { >> friend >> class boost::serialization::access; >> >> public: >> >> NonVolatileData(){ i = 1; }; >> virtual ~NonVolatileData() = 0; // Note - pure virtual function >> make class abstract- >> >> >> protected: >> >> virtual void Dummy() =0; // Note - pure virtual function make >> class abstract- >; >> >> int i; >> template <class Archive> >> void serialize( Archive& ar, const unsigned int version ) >> { >> ar & i; >> } >> }; >> BOOST_CLASS_TRACKING(NonVolatileData, >> boost::serialization::track_never) >> >> >> class SomeData: public NonVolatileData >> { >> friend >> class boost::serialization::access; >> >> public: >> >> SomeData () >> { >> }; >> >> ~SomeData () >> { >> }; >> >> void SetValue( std::string& Address ) >> { >> this->Address = Address; >> } >> >> void Dummy() >> { >> } >> >> private: >> >> template <class Archive> >> void serialize( Archive& ar, const unsigned int version ) >> { >> ar & >> >> boost::serialization::base_object<NonVolatileData>(*this); >> ar& Address; } >> >> std::string Address; >> }; >> BOOST_CLASS_TRACKING(SomeData, boost::serialization::track_never) >> ///////////////////////////////////////////////////////////////// >> >> My data storage interface will take a ptr to the base class i.e. >> Save(NonVolatileData* data) so the serialization will be performed >> through a ptr to the base class. I've read the documentation >> multiple times and I'm still unable to make that work correctly. >> When a do a save, only the base class is serialized even though the >> base class is polymorphic. I've tried using the >> BOOST_CLASS_EXPORT_GUID macro the force a registration of my derived >> class without success. I've also checked the example from demo.cpp. >> It uses the direct call to register_type() but in my case, I don't >> want to change the code everytime a new class is defined in the >> system so I went with option 2 (the macro). There's probably a >> subtle detail I do not do correctly (polite way of saying I'm missing >> something :-)). >> >> Thanks for your help, >> >> Guy Letourneau

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Re: [Boost-users] [test] running tests by name
by Sohail Somani 18 Jul '06

18 Jul '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Perepelitsa Roman > Sent: Tuesday, July 18, 2006 5:33 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] [test] running tests by name > > Hi, > > I have implementation of feature which was requested several times. It > allows you to run tests (implemented with the help of boost.tests) by > name. > > I attached 3 files. > > 1. filter.hpp should be copied to boost/test/detail. > 2. framework.ipp should be copied to boost/test/impl. > (after copying files you will probably need to rebuild boost.test) > 3. example.cpp contains example of usage. Me likey. This is what I needed. I'm not going to go the regex way, rather I'll explicitly require test suites, or tests. After all, its reasonable to have one test suite per executable imho, but its quite a lot more common to run a single test from a test suite. Thank you very much! Sohail

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how do I access m_property on an edge_descriptor
by kellygp 18 Jul '06

18 Jul '06

Hi, How do I access the m_property value of an edge_descriptor. I'm using an undirected graph and I need to get a unique identifier for each edge in the graph. The vertex pair I currently use for edges create two possible identifiers for each edge, but the m_property value of each edge appears unique only I cannot access it. Thanks, any help appreciated. George

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[test] running tests by name
by Perepelitsa Roman 18 Jul '06

18 Jul '06

Hi, I have implementation of feature which was requested several times. It allows you to run tests (implemented with the help of boost.tests) by name. I attached 3 files. 1. filter.hpp should be copied to boost/test/detail. 2. framework.ipp should be copied to boost/test/impl. (after copying files you will probably need to rebuild boost.test) 3. example.cpp contains example of usage. Here is how it works. Each test case receives the name in the form Suite1/Suite2/.../SuiteN/CaseName. For example there is test cases is example.cpp with name "Master Test Suite/A/Foo". Test executable accepts new argument --filter=<regex>. It allows you to run that and only that tests which names match given regex. Note: library implicitly adds ".*" to the beginning and to the end of given regex expression. For example if you run example.cpp without arguments, you will see: Foo in A Bar in A Foo in B Bar in B If you run it with argument "--filter=Foo", you will see: Foo in A Foo in B If you want to run all tests in the suite "A", you can try "--filter=/A/" or "--filter=^Master Test Suite/A/". P.S. You can use this feature without modification of boost.test sources. Just call boost::test_suite_detail::filter in your implementation of init_unit_test_suite. HTH, Roman Perepelitsa.

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boost::thread and member function
by King, Steven R 17 Jul '06

17 Jul '06

Hello All, Newbie question, thanks for your patience. I'm trying to pass a member function as the callback in boost::thread. Given this: class my_class { ... void foo(void); ... }; Instincts told me to do this: boost::thread my_thread( std::mem_fun(&my_class::foo) ); That didn't work and I discovered that boost::thread expects a boost::function0<void> instead. Can somebody please help me bridge the gap between std::mem_fun and boost::function0? I'm using gcc 4.1 on Linux and Boost 1.33.1 Cheers, -steve

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