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Threads, FunctionPtr and stepping through code
by Jaime Rios 19 Sep '07

19 Sep '07

Hi, I'm working on a project that uses the Boost thread library. The code is pretty simple and creates one thread to a function. To test out the code I created, I create a console app and tested the code on 2 platforms: Mac OS X for Intel and Mac OS X for PowerPC. The code worked fine in the console app so I incorporated the code into my main project, which is a dylib. The code worked fine on the Intel Mac, but when I debugged the dylib on the PowerPC Mac, I get a EXC_BAD_ACCESS error. After spending many hours trying to find out what the cause of the problem is, the only thing I could derive was that the address that Boost was using to access my function was wrong. Before the error, I have the following address to my function: (gdb) print f $1 = (void (*)(void)) 0x33658e4 <MyWorkerThread()> When I get the EXC_BAD_ACCESS error, the debugger stops at the following line: On line 95 of file function_template.hpp struct BOOST_FUNCTION_VOID_FUNCTION_INVOKER { static BOOST_FUNCTION_VOID_RETURN_TYPE invoke(any_pointer function_ptr BOOST_FUNCTION_COMMA BOOST_FUNCTION_PARMS) { HERE--> FunctionPtr f = reinterpret_cast<FunctionPtr>(function_ptr.func_ptr); BOOST_FUNCTION_RETURN(f(BOOST_FUNCTION_ARGS)); } }; The address at this point is the following: (gdb) print f $2 = (void (*)(void)) 0xf0798dd0 I went over the code over and over again but I cannot figure out what is causing the original function address to be changed. Now for the question! How can I debug this better? The problem that I am finding is that my debugger jumps to different parts of the project, but I cannot pinpoint the actual code that is causing this problem. Any suggestions? Thanks in advance! -Jaime

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boost::function & Copying efficiency
by Michael Bradley Jr 18 Sep '07

18 Sep '07

Hi, I'm looking for a way to let the function object wrapper be stored by reference instead of by cloning/copying. It's said in [1] that someone can achieve this through the use of references, but i don't know how to apply it in this particular case. <code> class A { bool operator()(void) {return false;} }; typedef boost::function<bool (void)> TEST; class B { void invoke(TEST obj); }; When i pass an instance of A as a parameter to the invoke method of B then the whole object is copied. I just want it to be use </code> I've also use boost::ref without success class C { void invoke(TEST & obj); }; doesn't work either! Thanks for any help or hint Michael [1] http://www.boost.org/doc/html/function/misc.html#id1215718

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Re: [Boost-users] Support __int64 and usigned __int64 in concept check interger type
by Chris Newbold 18 Sep '07

18 Sep '07

On Mon, 17 Sep 2007 14:33:53 -0400, Doug Gregor wrote: > On Sep 17, 2007, at 10:25 AM, thomas free wrote: >> ************************************ //Change here >> >> #ifdef _WIN64 >> >> template <> struct IntegerConcept<__int64> { void constraints() >> {} }; >> >> template <> struct IntegerConcept<unsigned __int64> { void >> constraints() {} }; >> >> #endif >> >> ************************************ >> >> #endif >> >> >> >> When I put this two lines, the code compile and link has well has on >> Win32 platform > > Those look fine; I've updated the Boost trunk accordingly. That's not going to help other 64-bit platforms like Linux, or for the use of 64-bit types like 'long long' on 32-bit systems. We've been bitten in the past by large discrepancies between IntegerConcept and is_integral in the type_traits library. Is there a reason why IntegerConcept doesn't just use is_integral? At the very least, it would be nice if the two had consistent answers for all types. -Chris

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creating graph dynamically..
by abhishek.v＠tcs.com 18 Sep '07

18 Sep '07

Hi m facing the similar problem posted on http://lists.boost.org/Archives/boost/2006/11/113553.php for creating graph dynamically. Also it's being said that adapter need to be made for this. Anyone have any idea if such adapter exist now .,, Thanks Abhishek Vyas Tata Consultancy Services Mailto: abhishek.v(a)tcs.com Website: http://www.tcs.com ____________________________________________ Experience certainty. IT Services Business Solutions Outsourcing ____________________________________________ =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you

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[Boost.Build] actions definition - filename
by Manuel Jung 18 Sep '07

18 Sep '07

Hi, I'm registring a new type to boost.build - "wsdl". It all works, but for my "actions" definition, i need the filename of the converted/compiled .wsdl file. e.g. the file is called "test.wsdl", i need the "test" from it. How can i access it? Kind Regards Manuel Jung

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question about global message queue
by nuaafantasy nuaafantasy 18 Sep '07

18 Sep '07

Dear All: when I create a message queue named with "Global\\abc",there is a interprocess exception,said that "The system cannot find the path specified." but if I named it "abc",it can be created My Os is Windows XP,because I want to use message queue between service and applicaiton,I must create a global shared memory. is there somebody can help me tackle with the problem? thanks a lot. is it an error of naming rule? Bruce

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serialization cross post
by Dan Schuman 18 Sep '07

18 Sep '07

Any comment here on this thread?http://tinyurl.com/3cjwxs Dan Schuman -- We've Got Your Name @ www.mail.com!!! Get a FREE E-mail Account Today - Choose From 100+ Domains

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Support __int64 and usigned __int64 in concept check interger type
by thomas free 17 Sep '07

17 Sep '07

Hi, I currently use Visual 2005 and boost 1.34.1 revision On Win32 already is fine but when I migrate to Win64 Somewhere in my code (the location it’s not important) I have an assert compilation error due to definition of long int/unisgned (64 bits) windows i.e. see concept_check.hpp (ligne 149): template <class T> struct IntegerConcept { //// }; #if !defined BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //// template <> struct IntegerConcept<unsigned long> { void constraints() {} }; // etc. <----- Pbs here ************************************ //Change here #ifdef _WIN64 template <> struct IntegerConcept<__int64> { void constraints() {} }; template <> struct IntegerConcept<unsigned __int64> { void constraints() {} }; #endif ************************************ #endif When I put this two lines, the code compile and link has well has on Win32 platform May I misunderstood something Or a better solution exist Thanks

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Get defines from a "dependency"
by Derek Gaston 17 Sep '07

17 Sep '07

Hello all, I'm trying to figure out how I can get the full set of defines from a dependency (and it's dependencies)... without actually depending on it. Any ideas? Thanks, Derek

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Newbie MultiIndex shared_ptr non-trivial class question
by T. Allison 17 Sep '07

17 Sep '07

I am attempting to use the Boost libraries for my first time. I am trying to create a MultiIndex container of shared_ptrs to fairly complicated objects. I've spent several days trying to figure this out, and I'm just spinning my wheels, and I'd really appreciate some help. I'm afraid this message is somewhat lengthy as I''ve tried to include appropriate detail. I have a class of observations which I wish to sort by 9 elements. I have overloaded operator< for this class, like so: class Observation { private: int x1; int x2; double x3; ... double x9; //other elements public: //Get Methods int GetX1(); int GetX2(); double GetX3(); ... double GetX9; //Overloaded operator<, == etc. bool operator<(const Observation &rhs); //appropriate nontrivial logic } The code will dynamically create thousands of these things to be used in many ways, so I've opted to use shared_ptr: typedef boost::shared_ptr<Observation> SharedObservation; I wish to view my collection of these various sorting criteria, or as linked lists, so I'm trying to use multi_index_container. If I write: typedef boost::multi_index_container<SharedObservation> ObservationCollection; and void AnotherClass::functionUsingCollection(data) { SharedObservation temp(new Observation(data) ); //Check and see if I've got one already, before I do anything master_collection.find(temp); //master collection is an object of type ObservationCollection } However, there is no point to using multi_index_container if I sort by only one index, so I've tried to expand out the index explicitly with an eye towards adding more indexes as I develop the code, like so: typedef boost::multi_index_container<SharedObservation,indexed_by<ordered_unique<identity<Observation> > > > ObservationCollection; //Add more indexing criteria later This does not compile on my Linux g++ (4. something bigger than 0) compiler. After a truly horrendous spewage, the crux of the messages seem to be lines like usr/include/boost/multi_index/detail/ord_index_ops.hpp:65: error: no match for call to ‘(const std::less<fuser::Observation>) (fuser::Observation&, const boost::shared_ptr<fuser::tr<fuser::Observation>&)' and /usr/include/boost/multi_index/detail/ord_index_ops.hpp:72: error: no match for call to ‘(const std::less<fuser::Observation>) (const boost::shared_ptr<fuser::Observation>&, fuserObservation>&)' usr/include/c++/4.1.2/bits/stl_function.h:226: note: candidates are: bool std::less<_Tp>::operator()(const _Tp&, const _Tp&) const [with _Tp = fuser::Observation] I tried adding a function less(shared_ptr &, Obervation &), but it didn't help. The command used to compile is g++ -Wno-deprecated -Wnon-non-template-friend -frepo -m32 Thanks, Getting Desperate T Allison -- View this message in context: http://www.nabble.com/Newbie-MultiIndex-shared_ptr-non-trivial-class-questi… Sent from the Boost - Users mailing list archive at Nabble.com.

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