November 2013 - Boost-users - lists.preview.boost.org

[Boost] Command Line to run a specific Boost Test Case using BOOST_AUTO_TEST_CASE_TEMPLATE
by Hemanth Choudary M V (RBEI/ETA1) 29 Dec '13

29 Dec '13

Hi, I would like to run this boost test case using the command line. Please note that the list contains data types that have 2 or more words. I need to know what to pass in the Command Line for -run_test=__________ #define BOOST_TEST_MODULE example #include <boost/test/included/unit_test.hpp> #include <boost/test/test_case_template.hpp> #include <boost/mpl/list.hpp> //____________________________________________________________________________// typedef boost::mpl::list<long long,unsigned char> test_types; BOOST_AUTO_TEST_CASE_TEMPLATE( my_test, T, test_types ) { BOOST_CHECK_EQUAL( sizeof(T), (unsigned)4 ); } //_ Mit freundlichen Grüßen / Best Regards, Hemanth Choudary MV RBEI/ETA1

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Threading question
by Davies, John 13 Dec '13

13 Dec '13

I have the following code and it terminates as expected. When I call the destructor it interrupts the thread. But if I change the this_thread::sleep to this_thread::yield the join() never happens and the program hangs. I must be misunderstanding yield. But I really don't want a sleep if possible. Thanks, John MessageQueueHandler::~MessageQueueHandler() { // Terminate the thread pMessageQueueInputThread->interrupt(); pMessageQueueInputThread->join(); delete pMessageQueueInputThread; } void MessageQueueHandler::MessageQueueInputThread() { unsigned int receivedSize; unsigned int priority; char buffer[queueMaximumMessageSize]; boost::this_thread::interruption_enabled(); try { while(1) { // Process all messages in the queue while(inputMessageQueue->try_receive(buffer, queueMaximumMessageSize, receivedSize, priority)) { BaseMessage * msg = reinterpret_cast<BaseMessage*>(buffer); callbackTable->DispatchMessage(msg); boost::this_thread::interruption_point(); } // Give other threads a chance to run // This is also an interruption point boost::this_thread::sleep(boost::posix_time::millisec(50)); <==Here } } catch(boost::thread_interrupted const&) { return; } } ___________________________________ John Davies Contractor Home Respiratory Care Philips Home Healthcare Solutions 1740 Golden Mile Highway Monroeville, PA 15146 Email: john.davies(a)philips.com Fax: 724-387-4109 ________________________________ The information contained in this message may be confidential and legally protected under applicable law. The message is intended solely for the addressee(s). If you are not the intended recipient, you are hereby notified that any use, forwarding, dissemination, or reproduction of this message is strictly prohibited and may be unlawful. If you are not the intended recipient, please contact the sender by return e-mail and destroy all copies of the original message.

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Fwd: support for bjam projects in IDE
by Witold E Wolski 06 Dec '13

06 Dec '13

Hi, I will have to work on bjam based project (rather big). I normally use QT Creator for programming and work with cmake based project. I could't find any hint how to set up an bjam project to work with QT neither information about any IDE which supports bjam. Do boost developer use vim and debug using gdb only? Actually the other guys on the project wrote some python scripts which parse bjam output to generated vcproj files :-@ I would be happy to hear from someone who are happy using bjam with qtcreator or any other IDE for larger projects and how to set this up. All my searches so far regarding bjam return almost exclusively FUD (http://en.wikipedia.org/wiki/Fear,_uncertainty_and_doubt) but looking at the Jamroot.jam file of the project (more than 1000 lines) I am inclinded to believe it. ;-( -- Witold Eryk Wolski -- Witold Eryk Wolski

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[MSM] Best place to execute an action with return value
by Daniele Barzotti 02 Dec '13

02 Dec '13

Hi, I'm diving into this very useful piece of code which is MSM and I'm modelling a state machine for a gsm modem. When I have to perform a call I need to move from the IDLE state to WAITING_RESPONSE and, in the transaction action I have to call the MakeCall() method on my GSM object. This method has a return value and a non 0 value means it is failed. In this situation the SM don't have to move on to the next state but remains in the IDLE one, so... Since the Actions has no return value, I have to use a Guard instead or I have to add another state called MAKE_CALL? Thanks in advance, Daniele.

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[OT] Boost Programming forum
by Daniele Barzotti 30 Nov '13

30 Nov '13

Hi, I'm sorry for this off-topic but... I received an email which informs me that I was been registered into this forum: http://www.boostprogramming.com/forum/index.php So, since I'm not register myself, I would ask if this site has some relation with boost community. Regards, Daniele.

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[Multi-Index] Skip-Scan "virtual" ordered-non-unique index on top of composite ordered-unique index
by Dominique Devienne 29 Nov '13

29 Nov '13

We have BMIs of entries with complex composite "natural-keys". For example: typedef boost::multi_index_container< FooIdPtr, // FYI: boost::shared_ptr<FooId> bmi::indexed_by< EntityIndex<ByUid>::unique, // FYI: Surrogate/Primary Key EntityIndex<ByNKey>::of<FooId>::unique, // FYI: Natural Key // additional indexes by type, name and parent EntityIndex<ByType>::non_unique, EntityIndex<ByName>::non_unique, EntityIndex<ByParent>::non_unique > > Impl; The EntityIndex template utility simply factors the index definitions used in several BMIs. For example template <> struct EntityIndex<ByNKey> { template <typename T_IDENT> struct of { typedef hashed_unique< // natural key (logical primary key) tag<ByNKey>, identity< shared_ptr<T_IDENT> >, EntityIdHash<T_IDENT>, EntityIdPred<T_IDENT> > unique; }; }; template <> struct EntityIndex<ByParent> { typedef hashed_non_unique< tag<ByParent>, BOOST_MULTI_INDEX_CONST_MEM_FUN( EntityId, const Uid&, parent_uid // FYI: EntityId is the base class of FooId and co. ) > non_unique; }; After recently reading http://www.sqlite.org/draft/optoverview.html#skipscan and its Skip-Scan optimization, I wondered about changing my ByNKey unique index from hashed to ordered, and thought that in theory, I could perhaps avoid the maintenance and memory cost of the additional type+name+parent indexes, since all three are subsets of the ByNKey unique index, and using a similar skip-scan strategy, which might/would still provide reasonable performance, at least better than no index at all (i.e. a full scan). I know BMI does not provide this of course, but do you think Joaquin that it would be possible to one-day add such "virtual" ordered non-unique indexes on top of an existing ordered (possibly unique) composite index? Of course in this case, the composite'ness is hidden inside FooId, and not exposed to BMI (it used to be a true BMI composite index, but modeling the identity as an object made more sense and simplified things), so whether an index is a subset of another would need to be "configurable" in some way, to yield a "compatible key" with the right "prefix" keys to skip to the next "sub-range" to scan (hopefully that makes sense...). I think I would be able to write custom code on top of a ByNKey ordered-non-unique index to implement a subset of the functionality a true BMI ordered non-unique index provides, for my own needs (with some difficulty, but feasible nonetheless), but the kind of template meta-programming BMI uses to implements its indexes is beyond my current skill level, which is why I'm posting to see what the experts (i.e. Joaquin) thinks about this Skip-Scan virtual indexes idea. Thanks, --DD

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Serialization problem with cyclic references (pointers)
by krisdamato 29 Nov '13

29 Nov '13

Try steppin through this code where the deserialization takes place. On every machine I've tried this (and I've tried it with two different Boost builds as well) parent stays null every time. Can anyone point out the reason why? This is giving me a headache :( I suspect it's got something to do with there being cyclic references between parent and child... #include <boost\archive\binary_oarchive.hpp> #include <boost\archive\binary_iarchive.hpp> #include <boost\serialization\vector.hpp> #include <fstream> #include <memory> #include <vector> class A { public: A() { parent = nullptr; someInt = 0; } template <class Archive> void serialize(Archive& archive, const unsigned int version) { archive & someInt; archive & parent; archive & children; } int someInt; A* parent; std::vector<A*> children; }; int main() { A* newA = new A(); A* newPtr = new A(); newPtr->someInt = 5; newPtr->parent = newA; newA->children.push_back(newPtr); // Save. std::ofstream outputFile("test", std::fstream::out | std::fstream::binary); if (outputFile.is_open()) { boost::archive::binary_oarchive outputArchive(outputFile); // Serialize objects. outputArchive << newA; outputArchive << newPtr; outputFile.close(); } delete newA; delete newPtr; newA = nullptr; newPtr = nullptr; // Load.| std::ifstream inputFile("test", std::fstream::binary | std::fstream::in); if (inputFile && inputFile.good() && inputFile.is_open()) { boost::archive::binary_iarchive inputArchive(inputFile); // Load objects. inputArchive >> newA; inputArchive >> newPtr; inputFile.close(); } return 0; } -- View this message in context: http://boost.2283326.n4.nabble.com/Serialization-problem-with-cyclic-refere… Sent from the Boost - Users mailing list archive at Nabble.com.

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[Exception] How do I inherit custom exception hierarchy from std::runtime_error rather than from std::exception?
by Egor Tensin 29 Nov '13

29 Nov '13

Hi, The issue that's confusing me arose from my intention of inheriting my exception classes from std::runtime_error rather than from std::exception. It seemed logical to me, as my exceptions are really runtime errors; getting something meaningful via what() also seemed like a good idea. However, this doesn't compile: #include <iostream> #include <stdexcept> #include <boost/exception/all.hpp> typedef boost::error_info<struct tag_foo_info, unsigned long> foo_info; struct foo_error : virtual boost::exception, virtual std::runtime_error { explicit foo_error(const char *const what) : std::runtime_error(what) { } explicit foo_error(const std::string& what) : std::runtime_error(what) { } }; static void foo() { BOOST_THROW_EXCEPTION(foo_error("foo error") << foo_info(42)); } int main(int argc, char *argv[]) { try { foo(); } catch (const std::exception& e) { std::cerr << boost::diagnostic_information(e); return 1; } return 0; } It says that there's no default constructor available for std::runtime_error. How do I fix this or should I use the idiomatic approach? The interesting thing is that if I erase the "virtual" keyword, the program compiles flawlessly. I wonder what is the reason for that, e.g. why the original code doesn't work and why the new code does, what are the consequences of making boost::exception and std::runtime_error base (non-virtual) classes, etc. I'm confused as the docs clearly recommends I build exception classes hierarchy using virtual inheritance. Could somebody please give me an insight into the inner workings of the library & inheritance mechanisms? Thank you in advance, Egor.

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[Bind & Function] c function pointers
by Matthijs Möhlmann 29 Nov '13

29 Nov '13

Hello all, It was pointed out to me that the subject line was not correct, so I resent this mail with a correct subject line. I'm not sure if this is possible at all, but let me explain: I have the following function signature: typedef int (*sasl_callback_ft)(void); That function in question gets called with unknown amount of parameters (usually 3 or 4) Now I want to assign a member function to it: class admin { public: int callback_fun(void *context, int id, const char **result, unsigned *len); } boost::function<int(void *, int, const char **, unsigned *)> callback = boost::bind(&admin::callback_fun, this, _1, _2, _3, _4); Obviously the compiler doesn't allow to assign callback to a sasl_callback_ft var sasl_callback_ft fun = callback; I get compiler errors like: matthijs@hammer:~/t2$ clang++ -o main -std=c++11 main.cpp main.cpp:22:19: error: no viable conversion from 'boost::function<int (void *, int, const char **, unsigned int *)>' to 'sasl_callback_ft' (aka 'int (*)()') sasl_callback_ft cbfun = cb; ^ ~~ /usr/include/boost/function/function_template.hpp:894:5: note: candidate function operator safe_bool () const ^ 1 error generated. Attached the testcase I made for this. Regards, Matthijs

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Re: [Boost-users] [Thread] Using thread accross libraries
by Sébastien Gallou 29 Nov '13

29 Nov '13

Antony, Thanks a lot for your answer. But I check the configuration of each project, and same runtime-library is used (/MDd) in both cases. So my problem doesn't come from here. If you have another idea... Thanks for your help, Sébastien

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