January 2014 - Boost-users - lists.preview.boost.org

[Boost::any] Memory management using dynamic libraries
by Eugenio Bargiacchi 13 Jan '14

13 Jan '14

I'm building a framework which needs to allow communication between shared libraries which are loaded at runtime. Each shared library provides its own implementation of an abstract interface contained in the framework (called Module), and all Modules are called sequentially multiple times doing the work they need to do. Since modules need to communicate with each other with custom data types, I though of using an std::unordered_map<std::string,boost::any> kept by the framework and shared with the Modules. The map is filled and read by the modules when their code is called through the Module interface which the framework knows (virtual functions). However after a bug I realized that each boost::any value is allocated by the modules, which is logical, since the framework itself has no knowledge of the types that will be stored in the map, and thus the code to allocate them must reside in the libraries themselves. I was wondering whether this could be a problem both during overwriting of a map value (since boost::any has to destroy its old contents) and during program shutdown. This could maybe be because modules use their own allocators. The problem that I had, for example, resulted in a segfault if I tried to unload the modules from memory before the destruction of the map (which is owned by the framework), during boost::any destruction. I assume this happened because the contents of boost::any were created in memory that was then unloaded during the unloading of the shared libraries, resulting in the segfault. And this yet does not take into account custom allocators! So I'm wondering what the best approach here would be. If I would need to keep track of the current "owner" of each single boost::any value allocated, and use it to manually destroy instances when required, or if there is a better way, maybe using some particular boost::any property. Many thanks in advance!

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[Test] using output_test_stream to compare in the middle of a file
by Lloyd 13 Jan '14

13 Jan '14

Hi, We need to test a function which reads a "record" from a binary file. We want to compare the buffer with the "record" in input file.We know the offset of the record in input file. How can we compare the output_test_stream with a certain offset (and length) of the file? or is there any alternative for this? Thanks, Lloyd

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Boost.Test segfault clang++3.3 macports cmake
by Dave Gomboc 13 Jan '14

13 Jan '14

I am getting a segmentation fault when attempting to use Boost.Test. I suspect that I don't have something set up correctly -- your assistance in remedying this would be appreciated. I am using clang++-mp-3.3 as installed by MacPorts on OS X 10.8.4. Here's the crash, which occurs after Boost.Test reports "*** No errors detected". Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: 13 at address: 0x0000000000000000 0x000000010006f6d6 in boost::unit_test::test_unit::~test_unit () (gdb) bt #0 0x000000010006f6d6 in boost::unit_test::test_unit::~test_unit () #1 0x000000010003bb5f in boost::unit_test::master_test_suite_t::~master_test_suite_t () #2 0x000000010003bcdd in boost::unit_test::framework_impl::~framework_impl () #3 0x00007fff8f465307 in __cxa_finalize () #4 0x00007fff8f466f57 in exit () #5 0x00007fff96ddc7e8 in start () (gdb) Here's a somewhat simplified version of what I have: ==== UseBoostUnitTestFramework.hpp ==== #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wall" #pragma clang diagnostic ignored "-Wdisabled-macro-expansion" #pragma clang diagnostic ignored "-Wexit-time-destructors" #pragma clang diagnostic ignored "-Wextra-semi" #pragma clang diagnostic ignored "-Wglobal-constructors" #pragma clang diagnostic ignored "-Wmissing-prototypes" #pragma clang diagnostic ignored "-Wsign-conversion" #pragma clang diagnostic ignored "-Wundef" #pragma clang diagnostic ignored "-Wweak-vtables" #include <boost/test/unit_test.hpp> #pragma clang diagnostic pop ==== HaveBoostUnitTestFrameworkDefineMain.cpp ==== #define BOOST_TEST_MODULE All_Tests #include "UseBoostUnitTestFramework.hpp" /* commenting out the next 3 lines makes no difference */ namespace boost { namespace unit_test { namespace framework { master_test_suite_t & master_test_suite(); } } } // namespace boost::unit_test::framework ==== CMakeLists.txt ==== cmake_minimum_required(VERSION 2.8.10 FATAL_ERROR) cmake_policy(VERSION 2.8.10) project (Foo) add_definitions(-DBOOST_TEST_DYN_LINK) add_library (foo SHARED Foo1.hpp more files... UseBoostUnitTestFramework.hpp Foo1.cpp more files... ) find_package(Boost COMPONENTS unit_test_framework REQUIRED) include_directories(${Boost_INCLUDE_DIRS}) file(GLOB_RECURSE test_source_files *.unit_tests.cpp) link_directories(${Boost_LIBRARY_DIRS}) add_executable(all_tests HaveBoostUnitTestFrameworkDefineMain.cpp ${test_source_files}) target_link_libraries(all_tests foo ${Boost_UNIT_TEST_FRAMEWORK_LIBRARY} ) set(CTEST_OUTPUT_ON_FAILURE TRUE) enable_testing() add_test(all_tests all_tests) set(CMAKE_C_COMPILER "clang-mp-3.3") set(CMAKE_C_FLAGS "-Weverything --std=c11 -O3 -DNDEBUG") set(CMAKE_CXX_COMPILER "clang++-mp-3.3") set(CMAKE_CXX_FLAGS "-ferror-limit=1 --std=c++1y -stdlib=libc++ -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-padded -O3 -DNDEBUG") ==== Foo1.hpp ==== (has declarations, but nothing that depends on Boost at all -- nor does any other non-test file) ==== Foo1.cpp ==== (has definitions, but nothing that depends on Boost at all -- nor does any other non-test file) ====Foo1.unit_tests.cpp ==== #include "Foo1.hpp" #include <string> #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wglobal-constructors" #include "UseBoostUnitTestFramework.hpp" BOOST_AUTO_TEST_SUITE(Bar1) BOOST_AUTO_TEST_CASE(foobar1) { BOOST_CHECK_EQUAL(std:string("a"), std::string("a")); } BOOST_AUTO_TEST_CASE(foobar2) { BOOST_CHECK_EQUAL(true, true); } BOOST_AUTO_TEST_SUITE_END() BOOST_AUTO_TEST_SUITE(Bar2) BOOST_AUTO_TEST_CASE(barfoo1) { BOOST_CHECK_EQUAL(1, 1); } BOOST_AUTO_TEST_CASE(barfoo2) { BOOST_CHECK_EQUAL(0, 0); } BOOST_AUTO_TEST_SUITE_END() #pragma clang diagnostic pop

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[predef] [rfc] Mutually exclusive definitions?
by Rene Rivera 13 Jan '14

13 Jan '14

After going back and re-reading various commentaries for the review of Boost.Predef and some after the review I'm questioning a design choice of Boost.Predef. Currently Boost.Predef will define multiple symbols when, for example, a compiler "emulates" another compiler. The current common occurrence of this is the GCC compiler which many other compilers emulate by defining the GCC version macros. This is no longer the case for the OS definitions though. The OS definitions are mutually exclusive. And hence in order to make for a more consistent behavior I am considering changing the library to make not just OS defs mutually exclusive. But also making compiler, library, and architecture mutually exclusive. And I'm asking for some general feedback as to what the most useful approach, from using Boost.Predef, is likely to be. In particular I'm considering the following choices: 1. Simple mutual exclusion of BOOST_ARCH_*, BOOST_COMP_*, BOOST_LIB_C_*, BOOST_LIB_STD_*, and of course BOOST_OS_* definitions. 2. Mutual exclusion of the base/real definitions with the addition of *_EMULATED definitions when multiple defs detected. For example for GCC we would have BOOST_COMP_GCC_EMULATED indicated the version of the GCC being emulated. 3. No mutual exclusion of base definitions but with the addition of a "flag" definition when multiple defs are detected. For example with GCC it would have the usual BOOST_COMP_GCC but also have a "#define BOOST_COMP_GCC_IS_EMULATED". 4. Do nothing and live with multiple definitions and the current discrepancy in behavior for BOOST_OS definitions. -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

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[test] floating point comparison
by Matthijs Möhlmann 13 Jan '14

13 Jan '14

Hello all, I've the following test program: #define BOOST_TEST_DYN_LINK #define BOOST_TEST_MAIN #define BOOST_TEST_MODULE Master test suite #include <boost/test/unit_test.hpp> BOOST_AUTO_TEST_CASE(TestCase) { BOOST_REQUIRE_CLOSE_FRACTION(45.00f, 45.17f, 0.004f); } When I compile it with the following line: g++ -o main.o -c -Werror -Wall -std=c++11 -fvisibility=hidden -fvisibility-inlines-hidden -DBOOST_SPIRIT_USE_PHOENIX_V3 -DUTEST -g main.cpp g++ -o main main.o -lboost_unit_test_framework I get the following output: Running 1 test case... *** No errors detected If I lower the tolerance to 0.0004f then I'll get the following: Running 1 test case... main.cpp(8): fatal error in "TestCase": difference{0.00376352} between 45.00f{45} and 45.17f{45.1699982} exceeds 0.00039999999 *** 1 failure detected in test suite "Master test suite" Why does it say that the difference is 0.00376352 and not 0.17....... ? Regards, Matthijs Möhlmann

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BOOST.TEST Mixing automatic and manual test registratioI
by Manuel Maier 13 Jan '14

13 Jan '14

Hi, Is it possible to mix manual and automatic test registration in Boost,.Test. Example: BOOST_AUTO_TEST_SUITE( ExampleTestSuite ) BOOST_AUTO_TEST_CASE( testcase1 ) { BOOST_TEST_MESSAGE("Test 1 in Example Test Suite"); BOOST_WARN_EQUAL(1, 1); BOOST_REQUIRE_MESSAGE(5 > 1, "Here is an example message. Something may be wrong"); } BOOST_AUTO_TEST_SUITE_END() Now I want to manually add a testcase to this testsuite. This seems to be important for me, as there is no automatic registration version for BOOST_PARAM_TEST_CASE(...) I also made a manualTestRegstration: test_suite* TestSuiteA = BOOST_TEST_SUITE("test_suiteA"); void manualTestCaseRegistration() { TestSuiteA->add( &test_case ); framework::master_test_suite().add( TestSuiteA ); } Is it possible to add a manual testcase(e.g.: test_case_b) to the ExampleTestSuite? Searching the internet I stumbled over following thread: https://svn.boost.org/trac/boost/ticket/7000 But it seems to me this patch never made it to release(at least until now). In fact( I guess) this could/would be exactly the feature I am looking for. Kind Regards and thanks for help Manuel _____________________________________________ 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] How to register custom exception for auto test?
by Jörg Becker 13 Jan '14

13 Jan '14

Hi, I'm using the test library of boost 1.49.0 for my unit tests. It works fine so fare, but if my program throws an error, I get the default error message unknown location(0): fatal error in "excption1_test": unknown type, witch hides the original error message. I tried to register an error translator, but without success. Here is what I tried (modified test/test/custom_exception_test.cpp to use auto test with global fixture): #define BOOST_TEST_MODULE "boost test custom_exception_test" #include <boost/test/unit_test.hpp> #include <boost/test/unit_test_monitor.hpp> using namespace boost::unit_test; BOOST_AUTO_TEST_SUITE( custom_exception_testsuite ) struct my_exception1 { explicit my_exception1( int res_code ) : m_res_code( res_code ) {} int m_res_code; }; void throw_my_exception1() { throw my_exception1( 12 ); } void my_exception1_translator( my_exception1 ) { BOOST_TEST_MESSAGE( "Caught my_exception1" ); } class my_config { public: my_config () { unit_test_monitor.register_exception_translator<my_exception1>( &my_exception1_translator ); } }; BOOST_GLOBAL_FIXTURE( my_config ) BOOST_AUTO_TEST_CASE( excption1_test ) { throw_my_exception1(); } BOOST_AUTO_TEST_SUITE_END() Can anybody tell me what I'm missing? Thanks, Jörg

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[BOOST]BOOST_AUTO_TEST_CASE_TEMPLATE vs BOOST_AUTO_TEST_CASE
by Hemanth Choudary M V (RBEI/ETA1) 13 Jan '14

13 Jan '14

Hi, Scenario1: Both files are present in the same Project BoostUnitTest. fileA: typedef boost::mpl::list<long long,unsigned char> test_types; BOOST_AUTO_TEST_SUITE(MySuite) BOOST_AUTO_TEST_CASE_TEMPLATE( my_test, T, test_types ) { BOOST_CHECK_EQUAL( sizeof(T), (unsigned)4 ); } BOOST_AUTO_TEST_SUITE_END() fileB: typedef boost::mpl::list<long long,unsigned char> test_types; BOOST_AUTO_TEST_SUITE(MySuite) BOOST_AUTO_TEST_CASE_TEMPLATE( my_test, T, test_types ) { BOOST_CHECK_EQUAL( sizeof(T), (unsigned)4 ); } BOOST_AUTO_TEST_SUITE_END() As shown above, MySuite is extended across 2 files fileA and fileB. The BOOST_AUTO_TEST_CASE_TEMPLATE name is same across the both the files and and the suite name is also same across both the files.. Boost is able to differentiate between the 2 test cases and the test cases are executed. Scenario2: fileA: BOOST_AUTO_TEST_SUITE(MySuite) BOOST_AUTO_TEST_CASE( my_test) { BOOST_CHECK_EQUAL(1,1); } BOOST_AUTO_TEST_SUITE_END() fileB: BOOST_AUTO_TEST_SUITE(MySuite) BOOST_AUTO_TEST_CASE_TEMPLATE( my_test ) { BOOST_CHECK_EQUAL( 1,1 ); } BOOST_AUTO_TEST_SUITE_END() In the scenario2, I get a compile time error (Error 1 error LNK2005: "public: void __thiscall mySuite::insuite2::test_method(void)" (?test_method@insuite2@mySuite@@QAEXXZ) already defined in BoostUnitTest.obj) which basically suggests that one or more multiply defined symbols are found. Why is the behaviour different in these 2 scenarios? How is Boost able to differenciate between the 2 test cases in Scenario1? Mit freundlichen Grüßen / Best Regards, Hemanth Choudary MV RBEI/ETA1

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[Boost.Test] Detail lost when using BOOST_*_NO_THROW
by Adam Nielsen 13 Jan '14

13 Jan '14

Hi again, While developing tests I sometimes find that functions that should not throw exceptions do. Because this is an unexpected situation, I would like to know what exception has been thrown so I know what problem to look for in my test design. Unfortunately the Boost.Test framework only provides a terse message like this: test.cpp(123): fatal error in "fnTest": exception thrown by test(); It doesn't tell you which exception was thrown, nor the reason why. Is there some way to tell Boost.Test to include the exception message (from what()) if the exception derives from std::exception? This would make problem solving much quicker as you would not have to run the tests through a debugger to see which exception is being thrown and why. There is some discussion about this on Stack Overflow[1] but the consensus seems to be the best solution is not to use BOOST_*_NO_THROW. If you don't use these and an exception is thrown, a lot more detail is provided. Assuming this is a limitation in Boost.Test, would it be possible to add this as a feature so that future versions include the same level of detail whether you use BOOST_*_NO_THROW or not? Many thanks, Adam. [1] http://stackoverflow.com/questions/15133259/boost-check-no-throw-how-to-get…

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--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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Using boost asio with client certificate "sslv3 handshake failure"
by Jeff Perkins 12 Jan '14

12 Jan '14

We are trying to connect to our server using boost asio and getting the error "handshake: sslv3 alert handshake failure". We have tried changing the ssl type, setting verify peer to none and a few other things with no success. The pem file we are using originated as a p12 file that we used openssl to output to a pem file for use in this project. Within the pem file there is both an encrypted private key and certificate. I have searched stackoverflow of a solution but the only similar thing that came up was openssl not being installed correctly which doesn't appear to be the problem in this case. Is there something I'm missing in my call back as I'm not passing a purpose or length, although I cannot find appropriate values to pass as purpose in the boost docs. - std::size_t max_length, // The maximum size for a password. - password_purpose purpose // Whether password is for reading or writing. using boost::asio::ip::tcp; boost::system::error_code ec; boost::asio::io_service io_service; boost::asio::ssl::context ctx(io_service, boost::asio::ssl::context::sslv23); ctx.set_password_callback(my_password_callback); ctx.use_private_key_file("/key1.pem",boost::asio::ssl::context_base::pem, ec); namespace ssl = boost::asio::ssl; typedef ssl::stream ssl_socket; ssl_socket sockconn(io_service, ctx); tcp::resolver resolver(io_service); tcp::resolver::query query(" tech.loopfish.com", "https"); boost::asio::connect(sockconn.lowest_layer(), resolver.resolve(query)); sockconn.lowest_layer().set_option(tcp::no_delay(true)); sockconn.set_verify_mode(boost::asio::ssl::verify_peer); sockconn.set_verify_callback(ssl::rfc2818_verification("tech.loopfish.com ")); sockconn.handshake(ssl_socket::client);

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[Boost.Graph] How to build a directed graph
by Lucas Soltic 10 Jan '14

10 Jan '14

Hello, I’m trying to build a DAG thanks to BGL, the source code builds fine but crashes at runtime. And I’m a bit lost on the reason. I don’t even know if my typedefs are correct according to my purpose: simply building a DAG whose nodes are « Classes » with arcs that point to « parents ». I’ve written the following: #include <list> #include <boost/graph/directed_graph.hpp> class MyClass {}; typedef MyClass* Vertex; typedef std::pair<Vertex, Vertex> Edge; typedef boost::directed_graph<Vertex, Edge> ClassInheritanceGraph; static ClassInheritanceGraph g_parentClassGraph; void buildGraph(void) { std::list<Edge> edges; edges.push_back(std::make_pair(new MyClass, new MyClass)); edges.push_back(std::make_pair(new MyClass, new MyClass)); std::list<Edge>::iterator edgesIt; for (edgesIt = edges.begin(); edgesIt != edges.end(); edgesIt++) { Vertex child = edgesIt->first; Vertex parent = edgesIt->second; boost::add_edge(child, parent, g_parentClassGraph); } } int main() { buildGraph(); return 0; } The program crashes on boost::add_edge() with a segfault. The point is I don’t know if I’m correctly using BGL. I don’t really know what is the proper way (I don’t understand everything from the BGL documentation…). I tried to debug the program but with all those template arguments I don’t understand the error (http://pastebin.com/BRgz3uL7 in case you want to make nightmares :) ). Thus in case someone understands what’s wrong here I would be really grateful for some help! Thanks, Lucas

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[iterator] error while accessing member of result of brackets-operator
by Sebastian Pfützner 10 Jan '14

10 Jan '14

Hello, the following code does not compile with the last line in main(). The error message is main.cpp: In function 'int main()': main.cpp:37:8: error: 'boost::detail::operator_brackets_result<It, S, S&>::type' has no member named 'i' it[3].i = 0; ^ What could be the problem? #include <boost/iterator/iterator_facade.hpp> struct S { int i; float f; }; class It : public boost::iterator_facade<It, S, boost::random_access_traversal_tag> { private: friend class boost::iterator_core_access; static S s; reference dereference() const { return s; } bool equal(It const&) const { return true; } void increment() {} void decrement() {} void advance(difference_type n) {} difference_type distance_to(It const&) const { return 0; } }; int main() { It it; (*(it + 3)).i = 0; S& s = it[3]; s.i = 0; it[3].i = 0; } -- Sebastian Pfützner s.pfuetzner(a)onlinehome.de ICQ-ID: 39965036

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boost process : how to use it
by Vincent R. 09 Jan '14

09 Jan '14

Hi, What is the status of boost:process, when looking on internet you can find different version that are more or less compatible. Not an ideal situation and I am a bit surprised that this lib doesn't get more love from c++ dev. Anyway after a long time coding in easier language I decided to do a small project under linux that consists in a tcp server running on linux that start some process initiated by a client and sends the output. So I have downaloaded the most "official" version I could find here http://www.highscore.de/boost/process/ and I tried the following code : #include <cassert> #include <iostream> #include <map> #include <string> #include <sstream> #include <vector> #include <boost/asio.hpp> #include <boost/enable_shared_from_this.hpp> #include <boost/process.hpp> namespace asio = boost::asio; namespace bp = boost::process; using asio::ip::tcp; bp::child start_child() { std::string exec = boost::process::find_executable_in_path("dpkg"); std::vector<std::string> args; args.push_back("-l"); bp::context ctx; ctx.stderr_behavior = bp::capture_stream(); return bp::launch(exec, args, ctx); } int main(int argc, char *argv[]) { std::string value; bp::child c = start_child(); bp::pistream &is = c.get_stderr(); std::string line; while (std::getline(is, line)) { value += line + "\r\n"; } c.wait(); std::cout << "OUTPUT: " << value << std::endl; return 0; } My first question is how can I merge the stderr with stdout because some commands use stdout and some others stderr ? My second question is : why the code above doesn't work properly and doesn't handle the arguments I am passing ? Indeed when I run the code I get the following output : OUTPUT: dpkg: error: need an action option it means that the -l is not taken in consideration. Thanks for any help

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Re: [Boost-users] How to create distributed_property_map (??????? ?????)
by Николай Кинаш 09 Jan '14

09 Jan '14

So, now i have: struct centrality_t { typedef vertex_property_tag kind; }; typedef property<centrality_t, double> VertexCentrality; typedef boost::adjacency_list<listS, distributedS<mpi_process_group,vecS>, undirectedS, VertexCentrality> Graph; typedef boost::unique_rmat_iterator<boost::minstd_rand, Graph> RMATGen; struct no_self_loops { no_self_loops() {} bool operator()(const std::pair<int,int>& e) { return e.first != e.second; } }; template <typename G> struct VertexKey { typedef int value_type; typedef typename graph_traits<G>::vertex_descriptor key_type; typedef read_write_property_map_tag category; typedef int* reference; }; int main(int argc, char* argv[]) { boost::mpi::environment env(argc, argv); boost::minstd_rand gen; unsigned int SCALE = atoi(argv[1]); unsigned int EDGE_FACTOR = atoi(argv[2]); unsigned int N = pow(2, SCALE); unsigned int E = EDGE_FACTOR * N; Graph g( boost::make_filter_iterator<no_self_loops> ( RMATGen(gen, N, E, 0.45, 0.15, 0.15, 0.25), RMATGen()), boost::make_filter_iterator<no_self_loops>(RMATGen(), RMATGen()), N); typedef boost::property_map<Graph, centrality_t>::type LocalMap; typedef boost::parallel::distributed_property_map<mpi_process_group, LocalMap, VertexKey<Graph> > CentralityMap; LocalMap local_map = get(centrality_t(), g); mpi_process_group process_groupe; //VertexKey<Graph> vertex_key; CentralityMap centrality_map(process_groupe, local_map); //brandes_betweenness_centrality(g, centrality_map); } network.cpp: In function ‘int main(int, char**)’: network.cpp:78: error: no matching function for call to ... /opt/boost_1_54_0_icc/boost/property_map/parallel/ distributed_property_map.hpp:329: note: candidates are: boost::parallel::distributed_property_map<ProcessGroup, GlobalMap, StorageMap>::distributed_property_map(const ProcessGroup&, const GlobalMap&, const StorageMap&) Is this right arguments centrality_map(process_groupe, local_map) ? Or it must be: VertexKey<Graph> vertex_key; CentralityMap centrality_map = boost::parallel::make_distributed_property_map(process_groupe, local_map, vertex_key); In this case: network.cpp:78: instantiated from here /opt/boost_1_54_0_icc/boost/property_map/parallel/impl/distributed_property_map.ipp:140: error: request for member ‘first’ in ‘p’, which is of non-class type ‘double’ /opt/boost_1_54_0_icc/boost/property_map/parallel/impl/distributed_property_map.ipp:142: error: request for member ‘second’ in ‘p’, which is of non-class type ‘double’ /opt/boost_1_54_0_icc/boost/property_map/parallel/impl/distributed_property_map.ipp:142: error: request for member ‘second’ in ‘p’, which is of non-class type ‘double’ Any suggestions? Thanks.

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[boost-users][asio] Can't read socket
by Miklós Tóth 08 Jan '14

08 Jan '14

Hi Community, I've a problem with named-pipe communication. Please help me investigate this. I'm totally clueless now. I have a Connector class. I want to read some data from a socket. This is it: class Connector { public: Connector(boost::asio::io_service& io_service) : _io_service(io_service), _socket(io_service) { _endpoint.address(boost::asio::ip::address::from_string("127.0.0.1")); _endpoint.port(4242); _socket.async_connect(_endpoint, boost::bind(&Connector::handle_accept, this, boost::asio::placeholders::error)); } void close() { _io_service.post(boost::bind(&Connector::do_close, this)); _io_service.stop(); } private: void handle_accept(const boost::system::error_code& error) { if (error) { throw ConnectorError(_T("Cannot estabilish connection.")); } boost::asio::async_read(_socket, boost::asio::buffer(_readbuffer, 1024), boost::bind(&Connector::handle_read, this, boost::asio::placeholders::error)); } void handle_read(const boost::system::error_code& error) { if (!error) { if (_readbuffer.empty()) { boost::this_thread::sleep(boost::posix_time::milliseconds(100)); } else { std::string string_buffer; std::copy(_readbuffer.begin(), _readbuffer.end(), std::back_insert_iterator<std::string>(string_buffer)); std::cout << string_buffer << std::endl; _readbuffer.clear(); } boost::asio::async_read(_socket, boost::asio::buffer(_readbuffer, 1024), boost::bind(&Connector::handle_read, this, boost::asio::placeholders::error)); } } void do_close() { _socket.close(); } boost::asio::io_service& _io_service; boost::asio::ip::tcp::socket _socket; boost::asio::ip::tcp::endpoint _endpoint; std::vector<char> _readbuffer; }; This is how I use it: boost::asio::io_service io_service; Connector connector(io_service); boost::thread async_io_thread(boost::bind(&boost::asio::io_service::run, &io_service)); while (1) { //... stuff } connector.close(); async_io_thread.join(); But whenever I send a data package, this class is unable to read it from the socket. The readbuffer is always empty. I have a python code to test the sending application. import sys import socket s = socket.socket() address = '127.0.0.1' port = 4242 try: s.connect((address, port)) except Exception, e: sys.stdout.write('conn err %s:%d. exception: %s' % (address, port, `e`)) try: data = s.recv(1024) print data while True: more = s.recv(1024) print more if not more: break except Exception, e: sys.stdout.write('read err %s:%d. exception: is %s' % (address, port, `e`)) It works perfectly. As far as I know these the two code snippet should work the same. Clearly I'm missing something. Regards, Miklos

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GSoc 2k14
by Aman Jain 07 Jan '14

07 Jan '14

Hey, I wanna to do Gsoc this year by contributing to some C++ libraries and I am beginner. Actually, I want to contribute by modifying libraries I have once made some part of String library by myself using OOPS I have talked at IRC channel and according to my interest someone suggested me to contribute to https://github.com/boostorg/algorithm Can some one help me out how should I continue ? How to use git-hub here for contribution and bug fixing ? Regards, Aman

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[ANN] Registration for C++Now 2014 is Open
by Boris Kolpackov 07 Jan '14

07 Jan '14

Hi, Registration is now open for the eighth annual C++Now conference (formerly BoostCon) which will be held in Aspen, Colorado, USA, May 12th to 17th, 2014. C++Now is a general C++ conference for C++ experts and enthusiasts. It is not specific to any library/framework or compiler vendor and has three tracks with presentations ranging from hands-on, practical tutorials to advanced C++ design and development techniques. In particular, one of the tracks is dedicated exclusively to tutorials. Last year the conference sold out pretty quickly and we expect it to happen again this year. As a result, we encourage anyone interested in attending to register early. Additionally, early bird hotel reservations end January 10th. For more information on registering, visit: http://cppnow.org/2014/01/2014-registration-is-open/ For early bird hotel reservations, visit: http://cppnow.org/location/lodging/ For general information about the conference, visit: http://cppnow.org/about/ Boris

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[Boost Graph Library] read_graphviz example
by Robert Johannes Langenberg 07 Jan '14

07 Jan '14

Hello, I've recently started using the boost graph library to read a graph in dot format generated with pygraphviz and run some analysis on it. I get the basic example http://www.boost.org/doc/libs/1_55_0/libs/graph/doc/read_graphviz.html#exam… to compile, but it then segfaults when reading the file because it can't find the property "colors" (stack trace below). Now I understand that I didn't define this property but I also have no idea how to do it. Debugging it, i find the name="colors", key=0 and value="red" for the function call below: #11 0x000000010001b40c in boost::put<unsigned long, std::string> (name=@0x100205880, dp=@0x7fff5fbff5f8, key=@0x100204d78, value=@0x100205888) at dynamic_property_map.hpp:292 292 boost::shared_ptr<dynamic_property_map> new_map = dp.generate(name, key, value); For a general understanding of what's happening: What is "key" good for? In the example, where is the variable vertex_color declared? What is this "mass" property and why does it contain vertex_color? What is the type vertex_color_t? The documentation didn't help me, maybe there are easier starting points or i've just looked in the wrong parts of http://www.boost.org/doc/libs/1_55_0/libs/graph/doc/table_of_contents.html If someone could point me to a proper example/tutorial/documentation it'd be greatly appreciated. Best regards, Robert Langenberg Stacktrace: Program received signal SIGABRT, Aborted. 0x00007fff971e8d46 in __kill () (gdb) where #0 0x00007fff971e8d46 in __kill () #1 0x00007fff8fa28f83 in abort () #2 0x00007fff8f35c9eb in abort_message () #3 0x00007fff8f35a39a in default_terminate () #4 0x00007fff8df32887 in _objc_terminate () #5 0x00007fff8f35a3c9 in safe_handler_caller () #6 0x00007fff8f35a424 in std::terminate () #7 0x00007fff8f35b58b in __cxa_throw () #8 0x0000000100016eae in boost::throw_exception<boost::exception_detail::error_info_injector<boost::property_not_found> > (e=@0x7fff5fbfedb8) at throw_exception.hpp:70 #9 0x0000000100016ff0 in boost::exception_detail::throw_exception_<boost::property_not_found> (x=@0x7fff5fbfee90, current_function=0x100061188 "boost::shared_ptr<boost::dynamic_property_map> boost::dynamic_properties::generate(const std::string&, const Key&, const Value&) [with Key = long unsigned int, Value = std::basic_string<char, std::cha"..., file=0x100061008 "/Users/rlangenb/workspace/boost_1_55_0/boost/property_map/dynamic_property_map.hpp", line=268) at throw_exception.hpp:87 #10 0x000000010001ae6e in boost::dynamic_properties::generate<unsigned long, std::string> (this=0x7fff5fbff5f8, name=@0x100205880, key=@0x100204d78, value=@0x100205888) at dynamic_property_map.hpp:268 #11 0x000000010001b40c in boost::put<unsigned long, std::string> (name=@0x100205880, dp=@0x7fff5fbff5f8, key=@0x100204d78, value=@0x100205888) at dynamic_property_map.hpp:292 #12 0x000000010000bf4a in boost::detail::graph::mutate_graph_impl<boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::property<boost::vertex_name_t, std::string, boost::property<boost::vertex_color_t, float, boost::no_property> >, boost::property<boost::edge_weight_t, double, boost::no_property>, boost::property<boost::graph_name_t, std::string, boost::no_property>, boost::listS> >::set_node_property (this=0x7fff5fbff340, key=@0x100205880, node=@0x1002063d0, value=@0x100205888) at graphviz.hpp:775 #13 0x000000010001f006 in boost::read_graphviz_detail::translate_results_to_graph (r=@0x7fff5fbff140, mg=0x7fff5fbff340) at read_graphviz_new.cpp:770

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Re: [Boost-users] [graph][BGL][PBGL] Use of dynamic_properties in parallel
by bminano 07 Jan '14

07 Jan '14

I have found the problem. It seems a cast problem in the dynamic_properties class. I have proposed a patch in the Ticket #9549. I am sorry, I am new to proposing patches so maybe that was not the correct way. -- View this message in context: http://boost.2283326.n4.nabble.com/graph-BGL-PBGL-Use-of-dynamic-properties… Sent from the Boost - Users mailing list archive at Nabble.com.

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How to create distributed_property_map
by Николай Кинаш 05 Jan '14

05 Jan '14

Hello. I try to calculate brandes_betweenness_centrality. #include <boost/graph/use_mpi.hpp> #include <boost/mpi/environment.hpp> #include <boost/mpi/communicator.hpp> #include <boost/graph/distributed/mpi_process_group.hpp> #include <boost/graph/parallel/process_group.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/distributed/adjacency_list.hpp> #include <boost/graph/small_world_generator.hpp> #include <boost/random/linear_congruential.hpp> #include <boost/graph/distributed/betweenness_centrality.hpp> #include <boost/graph/distributed/graphviz.hpp> #include <boost/graph/rmat_graph_generator.hpp> #include <boost/random/linear_congruential.hpp> #include <iostream> #include <algorithm> #include <math.h> using namespace boost; using namespace graph; using namespace distributed; namespace mpi = boost::mpi; typedef boost::adjacency_list<listS, distributedS<mpi_process_group,vecS>, undirectedS> Graph; typedef boost::unique_rmat_iterator<boost::minstd_rand, Graph> RMATGen; struct no_self_loops { no_self_loops() {} bool operator()(const std::pair<int,int>& e) { return e.first != e.second; } }; int main(int argc, char* argv[]) { boost::mpi::environment env(argc, argv); boost::minstd_rand gen; unsigned int SCALE = atoi(argv[1]); unsigned int EDGE_FACTOR = atoi(argv[2]); unsigned int N = pow(2, SCALE); unsigned int E = EDGE_FACTOR * N; Graph g( boost::make_filter_iterator<no_self_loops> ( RMATGen(gen, N, E, 0.45, 0.15, 0.15, 0.25), RMATGen()), boost::make_filter_iterator<no_self_loops>(RMATGen(), RMATGen()), N); typedef boost::property_map<Graph, vertex_index_t>::type LocalMap; boost::parallel::distributed_property_map<mpi_process_group, LocalMap, ||||||> centrality_map; //brandes_betweenness_centrality(g, centrality_map); } What should be here "|||||" ? I see http://www.boost.org/doc/libs/1_55_0/libs/graph_parallel/doc/html/distribut… template<typename ProcessGroup, typename LocalPropertyMap, typename Key, typename GhostCellS = gc_mapS> Key: The key_type of the distributed property map, which must model the Global Descriptor concept But don`t understand, is not work - typedef property_traits<LocalMap>::key_type key_type; Can you provide example?

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Is there a 1 line wonder for counting iterator and back_inserter - say a counting iterator where the start and step can be specified?
by Brian Davis 05 Jan '14

05 Jan '14

Is there a 1 line wonder for counting iterator and back_inserter - say a counting iterator where the start and step can be specified? The following code creates an vector of angles from zero to N-1 * angle step; std::vector angles; float angle_step = 0.275; int number_angles = 293; std::copy( boost::counting_iterator<float>(0), boost::counting_iterator<float>(number_angles), std::back_inserter(angles) ); std::copy( boost::make_transform_iterator(angles.begin(), boost::bind1st(std::multiplies<float>(), angle_step )), boost::make_transform_iterator(angles.end(), boost::bind1st(std::multiplies<float>(), angle_step )), angles.begin() ); Is there or could there be a counting iterator or other mechanism to do this in 1 line? Say where the start and step could be specified? Thanks

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Re: [Boost-users] Boost-users Digest, Vol 3673, Issue 1
by Markus Lenger 04 Jan '14

04 Jan '14

Hi Larry! The error must be somewhere else in your code. The following program behaves exactly as expected: #include <boost/regex.hpp> #include <string> #include <iostream> int main() { boost::match_results<std::string::const_iterator> match; boost::match_flag_type flags = boost::match_default; boost::regex re(std::string("^XXX_(\\d{3})_\\d{3}$"), boost::regex::perl | boost::regex::icase); std::string the_text = "XXX_123_456"; bool rc = boost::regex_search(the_text,match,re,flags); if (rc) { std::cout << "Number is " << match[1] << std::endl; return 0; } std::cout << "No match found" << std::endl; return 1; } --------- max@switters:~/tmp$ g++ test_regex.cpp -l boost_regex max@switters:~/tmp$ ./a.out Number is 123 Am 2014-01-03 18:00, schrieb boost-users-request(a)lists.boost.org: > Message: 1 > Date: Thu, 2 Jan 2014 16:40:55 -0500 > From: "Larry" <lknain(a)nc.rr.com> > To: <boost-users(a)lists.boost.org> > Subject: [Boost-users] [Regex] Subexpression matching during search > Message-ID: <D06A753E760144CDA0A00B03E0D0DFEE@XV2W> > Content-Type: text/plain; charset="utf-8" > > I have probably missed something in the doc that answers my query but I just can?t see it. > > This is using Perl syntax. > > I had a regex: > > ^(XXX_\d{3,3})_\d{3,3}$ > > It compiles OK but does not match anything in a regex_search. If I remove the parenthesis > > ^XXX_\d{3,3}_\d{3,3}$ > > I get matches. Any clues as to what I am missing? > > > Extract of regex related code lines: > > reg.regex = new boost::regex(reg.reg,boost::regex::perl | boost::regex::icase); > > boost::match_results<string::const_iterator> match; > boost::match_flag_type flags = boost::match_default; > std::string::const_iterator xstart, xend; > > xrc = boost::regex_search(xstart,xend,match,*((*rgi).regex),flags); > > Larry

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[Regex] Subexpression matching during search
by Larry 03 Jan '14

03 Jan '14

I have probably missed something in the doc that answers my query but I just can’t see it. This is using Perl syntax. I had a regex: ^(XXX_\d{3,3})_\d{3,3}$ It compiles OK but does not match anything in a regex_search. If I remove the parenthesis ^XXX_\d{3,3}_\d{3,3}$ I get matches. Any clues as to what I am missing? Extract of regex related code lines: reg.regex = new boost::regex(reg.reg,boost::regex::perl | boost::regex::icase); boost::match_results<string::const_iterator> match; boost::match_flag_type flags = boost::match_default; std::string::const_iterator xstart, xend; xrc = boost::regex_search(xstart,xend,match,*((*rgi).regex),flags); Larry

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