December 2013 - Boost-users

--run_test and using this to run a subset of Testcases.
by Manuel Maier 13 Jan '14

13 Jan '14

Hi I am looking for help considering running sets of Testcases/Testsuites. First off, is there a possibility to do a negative selection. i.e. tell boost.test to NOT run certain Testcases/testsuites? Further is it possible to run sets of Testcases(which may reside in different testsuites)? Assume following test tree: MASTER suite1 case1 case2 suite2 testcase1 testcase2 suite3 subsuite testcase1 Now lets say I wanna run testcase case1, testcase2 and the subsuite testsuite. Is this even possible? Kind Regards and thanks a lot for help Manuel Maier _____________________________________________ Manuel Maier, B. Eng. Business Unit "Motion" / Research & Development Bernecker + Rainer Industrie-Elektronik Ges.m.b.H. B&R Strasse 1 5142 Eggelsberg Austria Tel: +43 7748 6586 Fax: +43 7748 6586 - 24 Email: manuel.maier(a)br-automation.com http://www.br-automation.com ____________________________________________________________ Firmenbuchnummer: Landesgericht Ried im Innkreis / FN 111651 v

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[Boost.Test] Unable to perform init at startup
by Adam Nielsen 12 Jan '14

12 Jan '14

(Apologies for the last message, I am using an unfamiliar keyboard and accidentally pressed the 'send' keyboard combination.) Hi all, I'm having a bit of a problem trying to figure out how to perform some class init while manually registering my tests. I want to run a set of tests which all share the same class instance (this is a factory class that creates the objects to be tested.) I am creating a number of global class instances and using boost::bind in the constructor to register the tests with Boost.Test. This works fine, except that I need to create the factory class before the tests can be run. In case the factory class fails, I want to use some of the Boost.Test checks in the initialisation function. However when I do this, I get this runtime error: terminate called after throwing an instance of 'std::runtime_error' what(): can't use testing tools before framework is initialized I am assuming this means I need to wait with the construction of my factory class until Boost.Test is ready, but I am unsure how to do this. I am #defining BOOST_TEST_MODULE, and when I try to declare a function called init_unit_test() as suggested in the docs it tells me the function already exists. If I remove the BOOST_TEST_MODULE #define, then it complains that main() is not implemented. I am a bit confused because I do not understand the reason for having init_unit_test() if you cannot implement it. If you choose not to use the Boost auto function then it seems you must implement your own main(), so I would expect your init code would go there, so there is no need for the init_unit_test() function? Is there some other way not mentioned in the docs to manually register tests (which are class member functions) but where the class can call Boost.Test functions in its constructor? Many thanks, Adam.

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[ASIO] Async TCP/UDP server design help
by Terry Lazoki 02 Jan '14

02 Jan '14

I'm having hard time understanding the boost asio design and how i can use it to tackle my problem. My problem: Designing a tcp/udp server that is time efficient. 1. User sends packet through tcp 2. Server receives packet and processes it to build a large tree (n > 20000) 3. Server then parses the new tree and sends a summary packet through udp to another client Conditions/Limitations: - Has to be time efficient, receiving, processing and sending has to be done as fast as possible. - Processing the packet is heavy and can cause delays if its done in the same thread - Parsing the tree is also a little heavy when sending it through udp, can cause delays too Design 1 (2 threads): Thread 1: ASIO TCP and UDP. TCP receives packets and adds it to a circular buffer. While at the same time, processes the shared tree and sends packet through udp. Thread 2: Server grabs packet from circular buffer and processes it Some problems here: - I dont understand the async part here. What happens when tcp receives a packet, if the current thread is continuously parsing the tree and sending packets through udp. Do i need to separate the udp part to another thread? - I have 3 parts of the program that i need to run concurrently, well its really 2 parts and receiving packets through tcp. Any help is appreciated. Thanks,

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Mysterious early data termination using filtering_iostreams zlib_compressor
by Kenneth Adam Miller 31 Dec '13

31 Dec '13

I'm using intel's pin tool (pintool.org) and the boost library's filtering_stream in order to compress data before it goes to a file. I already have functioning code that does that, but at the very end of the execution of the target, right before the PIN_AddFiniFunction callback gets executed the stream of bytes in the compressed version ends (I assume this because the decompressed version is generated by subsequently opening another filtering_stream and using a zlib_decompressor and reading the entire compressed file out). I don't know why the stream ends early... This makes getting help kind of hard, because the files that are being produced are hundreds of megabytes, and differ by just a little kb. So even the diff is large, but I think the salient point is that the data included in the compressed/decompressed version is the same aside from the end. To make this easy for anybody helping, I've included a link to my repo where I've created a reproducible mini example, which should be able to be downloaded, built, and run without any hassel on the latest ubuntu: https://github.com/KennethAdamMiller/Boost-PinTool (It's a drop in replacement for debug trace; you just drop the appropriate files into the DebugTrace folder in your PIN_ROOT/source/tools/, then type make. There are very clear instructions! :) ) link to boost's filtering_stream: http://www.boost.org/doc/libs/1_54_0/libs/iostreams/doc/classes/filtering_s… After you build and run the tool, you should see debugtrace.out and decompressed.xml (the xml part I'm too lazy to change even as I type; it's just text). Go to the bottom of each, you can see that debugtrace.out ends with the line containing "eof" properly, but that the decompressed.xml does not... Can anybody tell me what the issue is? I'm quite certain that everything *should* have went into the FilteringStream that went into the ofstream... please help, I have no idea why it's terminating this way...

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Matrix Vector Multiplication in MPI (Coordinate Storage Format)
by ozhan fenerci 30 Dec '13

30 Dec '13

I wrote a serial code for a matrix-vector multiplication in a Coordinate Storage Format(COO). COO method has already made a big speed-up. My matrix is in a tridiagonal form. I want to parallelize the code and see how the parallelizm improves the code. My matrix could grow up to 2.000.000*2.000.000. Any efficient parallelization approach doesn't come to my mind (I have written some basic mpi programs but not much more. So my experience is limited.) Could you give me some headstart? Thanks. Özhan Fenerci #include <boost/numeric/ublas/banded.hpp> #include <boost/numeric/ublas/io.hpp> #include <vector> #include <iostream> #include "mpi.h" #include <stdio.h> int main(int argc, char *argv[] ) { using namespace boost::numeric::ublas; using std::cout; using std::endl; int numprocs, rank, chunk_size, i,j; int max, mymax,rem; int totalNonZeros; //totalNonZeros of TriDiagonal Matrix MPI_Status status; //b=A*x banded_matrix<double> A (10, 10, 1, 1); //vector<double> x(10); //vector<double> b(10); int* x = new int[10]; int* b = new int[10]; /* Initialize MPI */ MPI_Init( &argc,&argv); MPI_Comm_rank( MPI_COMM_WORLD, &rank); MPI_Comm_size( MPI_COMM_WORLD, &numprocs); //MPI_Status status; if (rank == 0) { for (signed i = 0; i < signed (A.size1 ()); ++ i) { for (signed j = std::max (i - 1, 0); j < std::min (i + 2, signed (A.size2 ())); ++j) A (i, j) = i + j; x[i]= 1; } } if(rank == 0) { cout << A <<endl<<endl; totalNonZeros = 0; for (signed i = 0; i < signed (A.size1 ()); ++ i) { for (signed j = std::max (i - 1, 0); j < std::min (i + 2, signed (A.size2 ())); ++ j) if( A(i,j) !=0) totalNonZeros++; } } cout<<"Number ot NonZeros "<<totalNonZeros<<endl; if(rank == 0) { int * row_idx = new int[totalNonZeros]; // row index array int * col_idx = new int[totalNonZeros]; // col index array int * val = new int[totalNonZeros]; //val array int index=0; for (signed i = 0; i < signed (A.size1 ()); ++ i) { for (signed j = std::max (i - 1, 0); j < std::min (i + 2, signed (A.size2 ())); ++ j) if( A(i,j) !=0) { row_idx[index] = i; col_idx[index]=j; val[index] = A(i,j); index++; } } //Clear out result for ( int k=0; k<A.size1(); ++k) { b[k]= 0; } //Matrix-vector Multiply for (int index=0 ; index <totalNonZeros;++index){ b[row_idx[index]] = b[row_idx[index]]+ val[index]*x[col_idx[index]]; cout<<b[3]<<endl; } //delete row_idx; // delete col_idx; //delete val; } MPI_Finalize(); return 0;

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unit and functional testing of boost statechart
by rahul baruah 29 Dec '13

29 Dec '13

Hello All, I like to do unit and functional testing of our implemented statemachine written using boost - statechart. Is there any framework for that?? anyone did any unit testing and suggestion?? Regards Rahul Protim Baruah

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[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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Re: [Boost-users] [serialization] Registering/exporting shared_ptr<T> in a library
by Martin Weinberg 29 Dec '13

29 Dec '13

On 12/28/2013 06:34 PM, Robert Ramey wrote: > > > On Saturday, December 28, 2013 2:15:44 PM UTC-8, Martin Weinberg wrote: > > I have a shared library for derived and base classes. My code passes > instances of derived classes T using boost::shared_ptr<B> to the base > class. This all works as expected. > > I've used the BOOST_CLASS_EXPORT_KEY and BOOST_CLASS_EXPORT_IMPLEMENT > macros to register both the classes Tand shared_ptr<T> typedefs to > all > the classes. > > If I attempt to serialize a base class pointer, > boost::serialization can > not find the serialize member for the shared_ptr to the derived > class. > > > a) double check the documentation boost/serialization/case > studies/shared_ptr<T> revisited > > b) Make sure you'r doing the following > > class A {...}; > class B : public A {...} > ... > A * = new B; // note we create a B and cast the address to an A* !!! > > ... should be no problem from here on out. > > Robert Ramey Thanks. What I'm doing is: shared_ptr<A> t(new B); and then: ar & A; It's ok if I put: BOOST_CLASS_EXPORT(shared_ptr<A>) BOOST_CLASS_EXPORT(shared_ptr<B>) in the caller but not if I put them in the library. Trying to understand if there's a way to put registration in the library rather than the main source.

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[serialization] Registering/exporting shared_ptr<T> in a library
by Martin Weinberg 28 Dec '13

28 Dec '13

I have a shared library for derived and base classes. My code passes instances of derived classes T using boost::shared_ptr<B> to the base class. This all works as expected. I've used the BOOST_CLASS_EXPORT_KEY and BOOST_CLASS_EXPORT_IMPLEMENT macros to register both the classes Tand shared_ptr<T> typedefs to all the classes. If I attempt to serialize a base class pointer, boost::serialization can not find the serialize member for the shared_ptr to the derived class. However, if I don't register the shared_ptr<T> for each derived class T in the shared library, but instead use BOOST_EXPORT_CLASS(shared_ptr<T>) in main(), everything works fine. Is there a workaround so that I don't need BOOST_EXPORT_CLASS(shared_ptr<T>) in main() for every possible derived class? Thanks. I can provide a trivial example that illustrates this issue if that would help.

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Boost [Regex] (grep Falg) Why doesn't this pattern match?
by Asmita Gaikwad 27 Dec '13

27 Dec '13

Hi, Environment: Windows 7 (32 bit), Visual Studio 2010 (Visual C++) I am trying to use Boost REGEX regex_match algorithm. I am using its grep flag. My code is as follows and here (a)* matches string "aaa", but still b comes out to be false. 1 2 3 4 5 6 7 8 9 10 11 bool MatchWithGrep(string& pattern, string& data) { const boost::regex e(pattern.c_str(), boost::regex::grep); return regex_match(data.c_str(), e); } I am passing following parameters bool b = MatchWithGrep("(a)*\\n123", "aaa"); In Boost Help, following is documented. Link - http://www.boost.org/doc/libs/1_55_0/libs/regex/doc/html/boost_regex/syntax/ basic_syntax.html When an expression is compiled with the flag grep set, then the expression is treated as a newline separated list of POSIX-Basic expressions, a match is found if any of the expressions in the list match, for example: boost::regex e("abc\ndef", boost::regex::grep); will match either of the POSIX-Basic expressions "abc" or "def". Considering this, in my example i have 2 basic expressions (a)* and 123. (Since its c++ string \\n <file:///\\n> will be taken as \n internally. I had debugged the code and i can see value of variable pattern as "(a)*\n123" in watch window). Presence of any should give me bool b as true. And my data is "aaa". So it should give true. But i am getting false. Can anyone help me to find what's wrong with my code? Thanks & Regards, Asmita EDISPHERE Software Private Limited Email: asmita.gaikwad(a)edisphere.com| Website: <http://www.edisphere.com/> http://www.edisphere.com

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filesystem temp_directory_path() returns undefined data
by Philipp Kraus 26 Dec '13

26 Dec '13

Hello, I have build Boost 1.55 on OSX 10.8.5 and I have written a short example to get the temporary path of my system. So I run std::cout << temp_directory_path() << std::endl, and it results "B?@?e/test/libboost_hA?@??%UP^?" I have build Boost with bjam myself and otool results the correct linked file. How can I solved the error? Thanks a lot Phil

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compilation
by Mihir Thakkar 25 Dec '13

25 Dec '13

hello all i cloned the git repository by following command. i use ubuntu12.10 1) git clone --recursive https://github.com/boostorg/boost.git modular-boost 2) ./bootstrap.sh 3) ./b2 headers after this on running the following command for separately compiled libraries, 4) ./b2 and i got the error like following. gcc.compile.c++ bin.v2/libs/iostreams/build/ gcc-4.7/release/link-static/threading-multi/bzip2.o libs/iostreams/src/bzip2.cpp:20:56: fatal error: bzlib.h: No such file or directory compilation terminated. "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -pthread -DBOOST_ALL_NO_LIB=1 -DBOOST_IOSTREAMS_USE_DEPRECATED -DNDEBUG -I"." -c -o "bin.v2/libs/iostreams/build/gcc-4.7/release/link-static/threading-multi/bzip2.o" "libs/iostreams/src/bzip2.cpp" ...failed gcc.compile.c++ bin.v2/libs/iostreams/build/gcc-4.7/release/link-static/threading-multi/bzip2.o... ...skipped <pbin.v2/libs/iostreams/build/gcc-4.7/release/link-static/threading-multi>libboost_iostreams.a(clean) for lack of <pbin.v2/libs/iostreams/build/gcc-4.7/release/link-static/threading-multi>bzip2.o... ...skipped <pbin.v2/libs/iostreams/build/gcc-4.7/release/link-static/threading-multi>libboost_iostreams.a for lack of <pbin.v2/libs/iostreams/build/gcc-4.7/release/link-static/threading-multi>bzip2.o... ...skipped <pstage/lib>libboost_iostreams.a for lack of <pbin.v2/libs/iostreams/build/gcc-4.7/release/link-static/threading-multi>libboost_iostreams.a... gcc.compile.c++ bin.v2/libs/iostreams/build/gcc-4.7/release/threading-multi/bzip2.o libs/iostreams/src/bzip2.cpp:20:56: fatal error: bzlib.h: No such file or directory compilation terminated. "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -pthread -fPIC -DBOOST_ALL_NO_LIB=1 -DBOOST_IOSTREAMS_DYN_LINK=1 -DBOOST_IOSTREAMS_USE_DEPRECATED -DNDEBUG -I"." -c -o "bin.v2/libs/iostreams/build/gcc-4.7/release/threading-multi/bzip2.o" "libs/iostreams/src/bzip2.cpp" ...failed gcc.compile.c++ bin.v2/libs/iostreams/build/gcc-4.7/release/threading-multi/bzip2.o... ...skipped <pbin.v2/libs/iostreams/build/gcc-4.7/release/threading-multi>libboost_iostreams.so.1.55.0 for lack of <pbin.v2/libs/iostreams/build/gcc-4.7/release/threading-multi>bzip2.o... ...skipped <pstage/lib>libboost_iostreams.so.1.55.0 for lack of <pbin.v2/libs/iostreams/build/gcc-4.7/release/threading-multi>libboost_iostreams.so.1.55.0... ...skipped <pstage/lib>libboost_iostreams.so for lack of <pstage/lib>libboost_iostreams.so.1.55.0... ...failed updating 2 targets... ...skipped 6 targets... i would appreciate if someone would guide me how to solve the problem. thank you!

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[program_options] with DOxygen?
by Mauricio Carneiro 25 Dec '13

25 Dec '13

I am writing a tool with command line options coordinated by boost program options. The API is well documented with Doxygen, but I would like Doxygen to also document the command line options for the tools extracting the information from the boost program_options variables. This would make the HTML useful also for the users, not just the developers. Does anyone know if there is such an integration between boost program_options and doxygen? If not, is there some other tool out there that produces HTML command line usage based on boost program_options? Merry christmas! Mauricio Carneiro, Ph.D. http://www.broadinstitute.org/~carneiro/

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STL MAP Insertion and Updates ..!!
by Rahul Mathur 25 Dec '13

25 Dec '13

Hi, Looking for clue for below. Having a code which has to be inserted and updated with following status - 1. Insert with unique ID and initially with two values (viz . v1[1100] & v2[1000]) 2. If v1 [viz 1100] is NOT accepted exit. 3. Else value v2[1000] is accepted. With v2 being accepted, further insert with same unique ID on which v2 was accepted but now either with three values of v3[1001] or v4[1002] or v5[1003] and UPDATE the STL MAP. 4. Print the FINAL value (v2 or v3 or v5) of STL MAP with given unique ID. Did wrote below lines which works until value v1 [1000] insertion - --- #include <iostream> #include <algorithm> #include <map> #include <iterator> using namespace std; struct TBag { int UnqID; short value_code; TBag():UnqID(1234),value_code(1000){} }; TBag ms_var1; typedef std::map<int, short> map1; class Apple { map1 abc; public: void TypeInsert ( TBag *ms_var ); }; void Apple::TypeInsert ( TBag *ms_var ) { // Insert the 'UnqID' with messages of either TC = 1000 or 1100 only. typedef std::pair <map1::iterator, bool> itr; itr it1 = abc.insert( std::make_pair( ms_var->UnqID, ms_var->value_code ) ); typedef std::pair <map1::iterator, bool> itr; //Searching for value of Value Code = 1000 if (ms_var->value_code == 1100) { std::cout << "Value Error." << endl; exit (1); } if (it1.second) { // Checking correct insertion happened with 1000 std::cout << "Unq ID (" << it1.first->first << ") => " << "Value Code (" << it1.first->second << ")" << endl; std::cout << "The Status is .." << it1.first->first << " & " << it1.first->second << endl ; // INSERT now with Value code of either 1001 or 1002 or 1003 & finally UPDATE the STL MAP std::cout << "Final Status:" << endl ; for( map<int, short>::iterator iter = map1.begin(); iter != map1.end(); ++iter ) std::cout << iter->first << " " << iter->second << endl ; std::cout << "All Status successful." << endl; } else std::cout << "Status Error." << endl; } int main () { Apple ms; ms.TypeInsert( &ms_var1 ); return 0; } --- Any help is well appreciated ..:) ~ XoXo

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Re: [Boost-users] How to use the optional with property_tree‏
by 王郁槐 25 Dec '13

25 Dec '13

I still don't understand，could you please figure it out？thanks. 发送自魅族手机 -------- 原始邮件 -------- 发件人：Olivier Tristan <o.tristan(a)uvi.net> 时间：周四 12月19日 22:08 收件人：boost-users(a)lists.boost.org 主题：Re: [Boost-users] How to use the optional with property_tree‏ >Those following lines from your code should give you a hint > >if (child2) >{ >child2.get().put_value(strValue); >} >else >{ >child2.get().put_value(strValue); >} > > > >Le 19/12/2013 12:34, 王郁槐 a écrit : >> Could anyone help? Why the below code will crash on the below line? I'm using the boost property_tree. Thanks. >> >> child1.get().put(sub_field, strValue); >> >> ========================================================= >> #include <fstream> >> #include <boost/filesystem.hpp> >> #include <boost/property_tree/ptree.hpp> >> #include <boost/property_tree/ini_parser.hpp> >> #include <boost/any.hpp> >> #include <boost/optional.hpp> >> >> void writeConfig(const std::string &field, const std::string &sub_field, const std::string & strValue) >> { >> if (!boost::filesystem::exists(prog_cfg_file)) >> { >> std::ofstream ofIniConfig(prog_cfg_file, std::ofstream::out|std::ofstream::app); >> ofIniConfig.close(); >> } >> >> >> boost::property_tree::ptree pt; >> boost::property_tree::ini_parser::read_ini(prog_cfg_file, pt); >> boost::optional<boost::property_tree::ptree&> child1 = pt.get_child_optional(field); >> >> if (child1) >> { >> boost::optional<boost::property_tree::ptree&> child2 = child1.get().get_child_optional(sub_field); >> >> if (child2) >> { >> child2.get().put_value(strValue); >> }else >> { >> child2.get().put_value(strValue); >> } >> }else >> { >> child1.get().put(sub_field, strValue); >> } >> >> boost::property_tree::ini_parser::write_ini(prog_cfg_file, pt); >> } >> >> int main() >> { >> writeConfig("test", "a", "OK"); >> return 0; >> } >> >> >> >> >> -- >> 兰生幽谷, 不以无人而不芳... >> >> >> >> >> _______________________________________________ >> Boost-users mailing list >> Boost-users(a)lists.boost.org >> http://lists.boost.org/mailman/listinfo.cgi/boost-users > > >-- >Olivier TRISTAN >uvi.net > >_______________________________________________ >Boost-users mailing list >Boost-users(a)lists.boost.org >http://lists.boost.org/mailman/listinfo.cgi/boost-users

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[graph] boykov_kolmogorov_max_flow and reverse edges capacity
by Olivier Tournaire 21 Dec '13

21 Dec '13

Hi, I am trying to use boykov_kolmogorov_max_flow algorithm to find a minimum cut of some graph. To build the graph, I first create source and sink vertices. I then add some vertices, and connect them. Each time I create and edge, I also create the reverse edge: edge_descriptor_bool e01 = add_edge(v0, v1, _graph); edge_descriptor_bool e10 = add_edge(v1, v0, _graph); reverse[e01.first] = e10.first; reverse[e10.first] = e01.first; where reverse is: boost::property_map<Graph, boost::edge_reverse_t>::type reverse = get(boost::edge_reverse , _graph); I then fill edge capacity: capacity[e10.first] = this->getEnergy(fh, fh_v0); // Use policy to compute energy capacity[e01.first] = this->getEnergy(fh, fh_v0); // Use policy to compute energy My question is how capacity of reverse edge has to be computed. The doc states that reverse edge can carry capacities different than 0, but should they be the same as their parallel edge? Note that I use the algorithm with this method: _minEnergy = boykov_kolmogorov_max_flow(_graph, _source, _sink); Any help would be appreciated. Regards, Olivier

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BGL: using short integer as vertex_descriptor
by Adam Celick 21 Dec '13

21 Dec '13

Hi, I am using the graph library in a memory constrained environment. By default vertex_descriptor for an adjacency_list (of vectors, i.e. vecS, vecS) seems to be std::size_t. I was wondering if there's a way to use say uint16_t for the vertex_descriptor? Thanks, -Adam

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[boost.test] Unable to perform init at startup
by Adam Nielsen 21 Dec '13

21 Dec '13

Hi all, I'm having a bit of a problem trying to figure out how to perform some class init while manually registering my tests.

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[boost.asio] Concurrently Ping 1000+ Hosts
by Kyle Ketterer 21 Dec '13

21 Dec '13

Hello, So the subject line pretty much says it all. Basically, I am trying to expand off of the icmp ping example given by the boost library documentation. I would like to ping 1000+ hosts in say, a matter of minutes rather than a matter of hours. I have already expanded the class shown here: http://www.boost.org/doc/libs/1_40_0/doc/html/boost_asio/example/icmp/ping.… Before I start posting code, I would like to discuss the strategy of trying to do this. In my Main thread, I was thinking about creating a vector of PingX objects. In the PingX class, I would have a separate io_service as well as wrap the async() functions in strands. I set the deadline timer at 800ms that way the io_service should return in less than a second. I would then call io_service run() in separate threads to *concurrently* ping these hosts. The problem appears to be that even through the async handers are wrapped in strands, there is data corruption. Is it true that when async handlers are wrapped in strands, they still cannot be executed *concurrently* ? My understanding of strand was that it serializes the handler functions to allow for thread safe access. However, I think that because I am accessing the same resources in multiple threads (such as the socket() object ), it is corrupting my expected output as well as occasionally throwing some exceptions. Are there any suggestions for the logic surrounding this or if this can be done in a multithreaded environment? Thanks! -- Kyle Ketterer

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Boost.Coroutine and Object Inheritance
by Carlos Ferreira 20 Dec '13

20 Dec '13

Hello to all. I need some help using the Boost.Coroutine lib. I wanted to use the coroutines as objects and for that, I tried to build a simple object and inherit the boost::coroutines::coroutine template. ex: class SimpleObj : public boost::coroutines::coroutine<SimpleObj>{ private: std::unique_ptr<boost::asio::ip::tcp::socket> tcpSkt_uPtr; std::unique_ptr<boost::asio::ip::tcp::acceptor> acc_uPtr; public: SimpleObj(std::shared_ptr<boost::asio::io_service> ioService_ptr, boost::asio::ip::tcp::endpoint &endPoint); ~SimpleObj(); void run(); }; Is this right? Can I actually inherit from the boost::coroutines::coroutine template ? If yes, how can I proceed from here, to use the run() object method as the coroutine itself, with an io_service provided through the constructor ? Thanks for any assistance! -- Carlos Miguel Ferreira Researcher at Telecommunications Institute Aveiro - Portugal Work E-mail - cmf(a)av.it.pt Skype & GTalk -> carlosmf.pt(a)gmail.com LinkedIn -> http://www.linkedin.com/in/carlosmferreira

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[git][testing] regression testing?
by Joaquín Mª López Muñoz 19 Dec '13

19 Dec '13

There's been some unanswered questions around this. I understand that regression tests, which are critical to ensure clean develop->master merges, will be eventually updated to work against git rather than the abandoned SVN, but I can't find any info on the progress of this. FWIW, I see some authors are going ahead and merging their libs anyway, which will bring breakages etc if changes are not properly validated through regression testing. Any indication on how this is progressing much appreciated. Best, Joaquín M López Muñoz Telefónica Digital ________________________________ Este mensaje se dirige exclusivamente a su destinatario. Puede consultar nuestra política de envío y recepción de correo electrónico en el enlace situado más abajo. This message is intended exclusively for its addressee. We only send and receive email on the basis of the terms set out at: http://www.tid.es/ES/PAGINAS/disclaimer.aspx

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How to use the optional with property_tree‏
by 王郁槐 19 Dec '13

19 Dec '13

Could anyone help? Why the below code will crash on the below line? I'm using the boost property_tree. Thanks. child1.get().put(sub_field, strValue); ========================================================= #include <fstream> #include <boost/filesystem.hpp> #include <boost/property_tree/ptree.hpp> #include <boost/property_tree/ini_parser.hpp> #include <boost/any.hpp> #include <boost/optional.hpp> void writeConfig(const std::string &field, const std::string &sub_field, const std::string & strValue) { if (!boost::filesystem::exists(prog_cfg_file)) { std::ofstream ofIniConfig(prog_cfg_file, std::ofstream::out|std::ofstream::app); ofIniConfig.close(); } boost::property_tree::ptree pt; boost::property_tree::ini_parser::read_ini(prog_cfg_file, pt); boost::optional<boost::property_tree::ptree&> child1 = pt.get_child_optional(field); if (child1) { boost::optional<boost::property_tree::ptree&> child2 = child1.get().get_child_optional(sub_field); if (child2) { child2.get().put_value(strValue); }else { child2.get().put_value(strValue); } }else { child1.get().put(sub_field, strValue); } boost::property_tree::ini_parser::write_ini(prog_cfg_file, pt); } int main() { writeConfig("test", "a", "OK"); return 0; } -- 兰生幽谷, 不以无人而不芳...

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Caching the iterator of async_resolve()?
by Kaspar Fischer 18 Dec '13

18 Dec '13

Hi everybody, Just to be on the safe side: I assume that I can cache the iterator returned by async_resolve<http://www.boost.org/doc/libs/1_49_0/doc/html/boost_asio/reference/ip__basi…>'s handler, correct? The fact that it's a forward iterator suggests so... Thanks! Kaspar

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[MPL] How to generate pre-generated header files for a mpl::list containing more than 50 entries?
by Klaus.Kempf＠industronic.de 18 Dec '13

18 Dec '13

Hello MPL experts, I want to code a state machine which has a reaction list containing more than 50 entries. I found here [http://svn.boost.org/svn/boost/trunk/libs/mpl/preprocessed/] some python scripts to generate header files for a mpl::list containing more than 50 entries. But I cannot manage to generate a single header file. Can someone please explain to me how to use these scripts? I also didn't find any help in boost documention. Command line messages of the related script were also not helpful for me: preprocess_list.py Usage: preprocess_list.py <mode> <boost_root> [<source_file>] Purpose: updates preprocessed version(s) of the header(s) in "boost\mpl\list\aux_\preprocessed" directory Example: the following command will re-generate and update all 'apply.hpp' headers: preprocess_list.py all f:\cvs\boost apply.cpp What is the meaning of [<source_file>] here? And how/where do I have to specify the count of list entries in order to generate the header files "list60.hpp", "list70.hpp" and so on? Many thanks for any help you could provide. Best regards, Klaus

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async_send handler problem
by Alexander Carôt 17 Dec '13

17 Dec '13

Hello all, I am new to boost and asio in particular. For now I am implementing a simple UDP sender. The sending process itself works fine but for some reason the send handler does not execute. The call itself looks like this: In my class sender.cpp I have a functions called void sender::sendIt(){ sj->dFC->s->async_send_to(boost::asio::buffer( this->charBuffer,sendBytes), *sj->dFC->e, boost::bind(&sender::sendHandler,this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred); } and the corresponding handler is this: void sender::sendHandler(const boost::system::error_code& error,std::size_t bytes_transferred){ cout << "TRIGGER" << endl; } Can anyone give me a hint what the reason for the not-working handler might be ? Thanks in advance, best Alex

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