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unexpected behaviour of filtering_ostream
by Ed Keith 06 Jan '12

06 Jan '12

I have the following code: int main(int argc, char *argv[]) { io::filtering_ostream out; out.push(std::cout); out << "this is a test" << endl; out << std::cin.rdbuf(); } when I run it the string "this is a test" gets sent to cout, but input type into cin does not get echoed to cout. Can anyone clue my in as to why not? -EdK Ed Keith e_d_k(a)yahoo.com Blog: edkeith.blogspot.com

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building boost.log on OSX 10.7.2 with boost 1_48
by Chris Bartlett 06 Jan '12

06 Jan '12

Hi all, I'm trying to build boost.log. I had it built and working against boost 1_47. I now have a clean 1_47 install on OSX (10.7.2) and I pulled boost.log from the trunk in sourceforge: https://boost-log.svn.sourceforge.net/svnroot/boost-log/trunk/ but when I build it, it reports that it needs 1_48. no problem - i'l build a boost 1_48 install and try that… boost 1_48 installed fine. I downloaded the boost.log from trunk and updated my kit and ran: ./bootstrap.sh -with-libraries=log --prefix=/usr/local --includedir=/usr/local/include --libdir=/usr/local/lib followed by: sudo ./b2 and I get the following: ...found 2606 targets... ...updating 9 targets... darwin.compile.c++ bin.v2/libs/log/build/darwin-4.2.1/release/threading-multi/tick_count.o libs/log/src/tick_count.cpp:220:5: error: #error Boost.Log: POSIX timers not supported on your platform "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -dynamic -no-cpp- precomp -gdwarf-2 -fexceptions -fPIC -DBOOST_ALL_NO_LIB=1 DBOOST_DATE_TIME_DYN_LINK=1 - DBOOST_FILESYSTEM_DYN_LINK=1 -DBOOST_LOG_BUILDING_THE_LIB=1 -DBOOST_LOG_DLL - DBOOST_LOG_USE_NATIVE_SYSLOG=1 -DBOOST_SYSTEM_DYN_LINK=1 -DBOOST_THREAD_POSIX - DBOOST_THREAD_USE_DLL=1 - DDATE_TIME_INLINE -DNDEBUG -I"." -c -o "bin.v2/libs/log/build/darwin-4.2.1/release/threading-multi/tick_count.o" "libs/log/src/tick_count.cpp" Anyone shed any light on this? has the latest version of boost.log not been built on OSX lion? any help gratefully received, Chris

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boost test: link time errors/regressions with boost 1.47 test
by Avi Bahra 06 Jan '12

06 Jan '12

I have been using/linking with boost test, 1.39 -->1.45 Boost unit-test has been very robust on the whole However migrating to 1.47 I am getting links errors of the form: ld: 0711-317 ERROR: Undefined symbol: .boost::unit_test::ut_detail::auto_test_unit_registrar::auto_test_unit_registrar(boost::unit_test::basic_cstring<const char>) ld: 0711-317 ERROR: Undefined symbol: .boost::unit_test::unit_test_log_t::set_checkpoint(boost::unit_test::basic_cstring<const char>,unsigned long,boost::unit_test::basic_cstring<const char>) ld: 0711-317 ERROR: Undefined symbol: .boost::test_tools::tt_detail::check_impl(const boost::test_tools::predicate_result&,const boost::unit_test::lazy_ostream&,boost::unit_test::basic_cstring<const char>,unsigned long,boost::test_tools::tt_detail::tool_level,boost::test_tools::tt_detail::check_type,unsigned long,...) ld: 0711-317 ERROR: Undefined symbol: .boost::unit_test::ut_detail::normalize_test_case_name(boost::unit_test::basic_cstring<const char>) ld: 0711-317 ERROR: Undefined symbol: .boost::unit_test::test_case::test_case(boost::unit_test::basic_cstring<const char>,const boost::unit_test::callback0<boost::unit_test::ut_detail::unused>&) The problem is on AIX 5.3. using v11.1 compiler linking with libboost_unit_test_framework-mt-d.a has always worked in the past. The library compiles and links without any errors on other platforms like HPUX/acc,linux32/gcc,linux64/gcc Any help appreciated Best regards, Ta, Avi

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Get All Words Offset in String using Boost regex
by S Nagre 06 Jan '12

06 Jan '12

Hello, I wish to determine the "start" and "length" of all the completed words in a string using Boost Regex For example I have a String "*Hello World and Google*" I would like to create a map like this... 1, 5 //First Character position and Length of Word "Hello" 7, 5 // First Character position and Length of Word World 14, 3 //First Character position and Length of Word "And" 18, 6 // First Character position and Length of Word "Google" This is the code I have written.. void CreateOffSetMap(std::string completeInStr) { std::map<int32, int32>OffSetMap; std::string escapeChar = "\\" ; std::string bChar = "b"; std::string dotChar = "."; std::string findWordInStr = escapeChar + bChar + dotChar + escapeChar + bChar; boost::regex regExpression(findWordInStr); boost::smatch what; std::string::const_iterator start = completeInStr.begin(); std::string::const_iterator end = completeInStr.end(); while (boost::regex_search(start, end, what, regExpression)) { int32 foundPos = what.position(); int32 foundLen = what.length(); int32 endOffSet = startOffSet + foundLen; std::string foundString(start + foundPos, start + foundPos + foundLen); OffSetMap[foundPos] = foundLen; start += foundPos + foundLen; } } But is not working correct as expected, Could Anyone tell me where I am doing wrong here ? Thanks in Advance Subhash

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[Graph] need suggestion
by srinivas boppu 06 Jan '12

06 Jan '12

Hello All, I need a graph structure as follows. (Here my input is a Graph which I call it as " Control Flow Graph".) On this "Control Flow Graph", I run a algorithm it creates another graph, and on that I will run again the algorithm, it will create another "Graph" and it continues until it become a "Single Node". I should be able to access all the Graphs in each stage and my original graph information should be untouched. What is the best way to do it ? Any suggestions ? (Actually, I am trying to solve one problem using "Interval Based Analysis" of Control Flow Graphs. I would like to divide the given main control flow graph into disjoint intervals. You can have a look at the following link for more information http://nptel.iitm.ac.in/courses/106108052/module9/control-flow-ana-2.pdf ) Regards, Srinivas

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Boost.Date_Time - Visual C++ 6
by asif saeed 06 Jan '12

06 Jan '12

Hi, Can DateTime build on Visual C++ 6? Has somebody already done it? Can you please point me to some online step-by-step instructions, a blog post or something that can help me to accomplish this? Thanks in advance, Asif

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Boost::shared::memory consistency
by Josmon Paul 06 Jan '12

06 Jan '12

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[BGL] Finding the descriptor for a given vertex
by Kelvin Chung 05 Jan '12

05 Jan '12

Suppose I have the following: template <class T> class Graph { // Adapter class that I use for my purposes typedef typename boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, T> innerGraph; typedef typename boost::graph_traits<innerGraph>::vertex_descriptor VertexDescriptor; innerGraph G; public: void addVertex(const T& vertex); bool containsVertex(const T& vertex) const; void addEdge(const T& from, const T& to); // More stuff here }; The intent of this adapter class is to basically abstract out all the mentions of stuff like the descriptors and such. So a good helper function to this end would be a function that retrieves the VertexDescriptor for a given T, if it exists. Is there such a function already in the BGL, or do I have to manage that separately (ie. having an external map)?

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Auto-Linking in Visual Studio 2008
by Robert Abel 05 Jan '12

05 Jan '12

Hi, I recently began using boost in a project on Windows using MS Visual Studio 9.0 2008 using CMake, i.e. the project setup is auto-generated using the correct boost libraries as link targets. In my project, I link to boost_thread*.lib, which should be the import library for boost_thread*.dll. However, when I compile the project, the I get the following linking error: > Error 43 fatal error LNK1104: cannot open file > 'libboost_thread-vc90-mt-1_48.lib' rsb-chat-1 rsb-chat-1 So it seems necessary to have the static library present as well when linking the executable. At first I thought this was the default auto-linking behavior described in the documentation, i.e. static linking. However, once all needed static libraries are supplied, the final executable still needs the dynamic boost_*.dll libraries. This did not seem right to me... Now, when I disable auto-linking using > #define BOOST_ALL_NO_LIB the linker will not try to link the static libboost_thread*.lib, but instead use the boost_thread*.lib that was defined in the project settings. I couldn't find any documentation on this specific auto-linking behavior. * Is this expected behavior? Maybe MSVS-specific behavior? * Does the presence of the static library actually preclude some dynamic linking from occurring, thus making my executable bigger? * Or does the static library basically just need to be present and auto-linking will actually not use it when it's not appropriate? * Or does auto-linking mix and match, i.e. in my original case, when I supplied the static libraries: Did it link some functions statically, while others dynamically? Thanks, Robert

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[type_traits] type_with_alignment<64> on gcc
by Ioannis Papadopoulos 05 Jan '12

05 Jan '12

Hi, Is there any particular reason that type_with_alignment does not support alignment more than 32 on gcc? I am trying to create an unordered_map of objects that are aligned to cache line size (64bytes) and it fails in type_with_alignment. This small example shows it: #include <boost/tr1/unordered_map.hpp> struct __attribute__((aligned(64)) A { int i; }; int main() { std::tr1::unordered_map<int, A> umap; umap[0] = A(); return 0; } In file included from /usr/local/boost/boost_1.48/include/boost/aligned_storage.hpp:21:0, from /usr/local/boost/boost_1.48/include/boost/type_traits/aligned_storage.hpp:11, from /usr/local/boost/boost_1.48/include/boost/unordered/detail/buckets.hpp:17, from /usr/local/boost/boost_1.48/include/boost/unordered/detail/table.hpp:10, from /usr/local/boost/boost_1.48/include/boost/unordered/detail/equivalent.hpp:14, from /usr/local/boost/boost_1.48/include/boost/unordered/unordered_map.hpp:18, from /usr/local/boost/boost_1.48/include/boost/unordered_map.hpp:16, from /usr/local/boost/boost_1.48/include/boost/tr1/unordered_map.hpp:21, from test.cc:1: /usr/local/boost/boost_1.48/include/boost/type_traits/type_with_alignment.hpp: In instantiation of ‘boost::detail::type_with_alignment_imp<64ul>’: /usr/local/boost/boost_1.48/include/boost/type_traits/type_with_alignment.hpp:216:7: instantiated from ‘boost::type_with_alignment<64ul>’ /usr/local/boost/boost_1.48/include/boost/mpl/eval_if.hpp:60:31: instantiated from ‘boost::mpl::eval_if_c<false, boost::mpl::identity<boost::detail::max_align>, boost::type_with_alignment<64ul> >’ /usr/local/boost/boost_1.48/include/boost/aligned_storage.hpp:55:21: instantiated from ‘boost::detail::aligned_storage::aligned_storage_imp<128ul, 64ul>::data_t’ /usr/local/boost/boost_1.48/include/boost/aligned_storage.hpp:56:7: instantiated from ‘boost::detail::aligned_storage::aligned_storage_imp<128ul, 64ul>’ /usr/local/boost/boost_1.48/include/boost/aligned_storage.hpp:73:7: instantiated from ‘boost::aligned_storage<128ul, 64ul>’ /usr/local/boost/boost_1.48/include/boost/unordered/detail/table.hpp:281:59: instantiated from ‘boost::unordered::detail::value_base<std::pair<const int, A> >’ /usr/local/boost/boost_1.48/include/boost/unordered/detail/unique.hpp:47:12: instantiated from ‘boost::unordered::detail::ptr_node<std::pair<const int, A> >’ /usr/local/boost/boost_1.48/include/boost/unordered/detail/unique.hpp:332:40: instantiated from ‘boost::unordered::detail::table_impl<Types>::value_type& boost::unordered::detail::table_impl<Types>::operator[](const key_type&) [with Types = boost::unordered::detail::map<std::allocator<std::pair<const int, A> >, int, boost::hash<int>, std::equal_to<int> >, boost::unordered::detail::table_impl<Types>::value_type = std::pair<const int, A>, boost::unordered::detail::table_impl<Types>::key_type = int]’ /usr/local/boost/boost_1.48/include/boost/unordered/unordered_map.hpp:1007:26: instantiated from ‘boost::unordered::unordered_map<K, T, H, P, A>::mapped_type& boost::unordered::unordered_map<K, T, H, P, A>::operator[](const key_type&) [with K = int, T = A, H = boost::hash<int>, P = std::equal_to<int>, A = std::allocator<std::pair<const int, A> >, boost::unordered::unordered_map<K, T, H, P, A>::mapped_type = A, boost::unordered::unordered_map<K, T, H, P, A>::key_type = int]’ test.cc:11:9: instantiated from here /usr/local/boost/boost_1.48/include/boost/type_traits/type_with_alignment.hpp:206:1: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ /usr/local/boost/boost_1.48/include/boost/type_traits/type_with_alignment.hpp:207:1: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ Is there any easy way to avoid this problem? Thanks

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