July 2012 - Boost-users - lists.preview.boost.org

Error :Boost 1.48.0 with latest IBM compiler
by devika R S 24 Jul '12

24 Jul '12

Hi All, This post is regarding the issue we saw on IBM compiler using BOOST 1.48 version. Here is the sample code . *********************************Example Code************************************* #include <boost/config/warning_disable.hpp> #include <boost/spirit/include/qi.hpp> #include <boost/spirit/include/phoenix_operator.hpp> #include <boost/spirit/home/phoenix/statement/if.hpp> #include <boost/spirit/home/phoenix/bind/bind_function.hpp> #include <iostream> #include <string> namespace client { namespace qi = boost::spirit::qi; namespace ascii = boost::spirit::ascii; namespace phx = boost::phoenix; struct vars_ : qi::symbols<char, double> { vars_() { add("ans" , 0); } } vars; template <typename Iterator> struct parser : qi::grammar<Iterator, double()> { parser() : parser::base_type(function) { using qi::eps; using qi::lit; using qi::_val; using qi::_1; using ascii::char_; using qi::double_; using qi::string; using qi::lexeme; using boost::phoenix::if_; using qi::alpha; using qi::alnum; MAX = lexeme[string("max") | string("MAX")]; //define max symbol MIN = lexeme[string("min") | string("MIN")]; //define min symbol D = lexeme[string("d") | string("D")]; //define distance symbol function = expression [_val = _1] | declaration | assignment | ( MAX >> "(" >> function [_val = _1] >> +(',' >> function [if_(_1 > _val)[_val = _1]]) >> ')') // call : max(function,...) | ( MIN >> "(" >> function [_val = _1] >> +(',' >> function [if_(_1 < _val)[_val = _1]]) >> ')') // call : min(function,...) | ( D >> "(" >> (function >> ',' >> function) >> ')'); // call : d(point1,point2) not implemented yet expression = term [_val = _1] >> *( ('+' >> term [_val += _1]) | ('-' >> term [_val -= _1])); term = factor [_val = _1] >> *( ('*' >> factor [_val *= _1]) | ('/' >> factor [_val /= _1])); factor = double_ [_val = _1] | (vars [_val += _1] ) | '(' >> expression [_val = _1] >> ')' | ('-' >> factor [_val = -_1]) | ('+' >> factor [_val = _1]) | declaration; ; assignment = vars >> '=' >> function; var_decl = lexeme [ qi::raw [ ( alpha >> *( alnum | '_' ) ) - vars ] ] //[ phx::bind(vars.add, _1) ] ; declaration = "var " >> var_decl >> *( ',' >> var_decl ); } qi::rule<Iterator, double()> MAX, MIN, D,expression, term, factor, function, assignment, var_decl, declaration; }; } int main() { typedef std::string::const_iterator iterator_type; typedef client::parser<iterator_type> parser; parser _parser; // Our grammar std::string str; double result; while (std::getline(std::cin, str)) { if (str.empty() || str[0] == 'q' || str[0] == 'Q') break; std::string::const_iterator iter = str.begin(); std::string::const_iterator end = str.end(); bool r = parse(iter, end, _parser, result); if (r && iter == end) { std::cout << "Parsing succeeded\n"; std::cout << "result = " << result << std::endl; } else { std::string rest(iter, end); std::cout << "Parsing failed\n"; } } return 0; } *********************************END************************************************** When we compile this code on IBM with the compiler : IBM XL C/C++ for AIX, V11.1 (5724-X13).Version: 11.01.0000.0009 we end up with below error: xlC -I/usr/include/common/boost -o test2.o -O -c -qnoansialias -qnoro -qchars=signed -q64 -qrtti=all test2.cpp "/usr/include/common/boost/boost/integer_traits.hpp", line 83.56: 1540-0724 (W) The non-type template argument "-1" of type "T" has wrapped. "/usr/include/common/boost/boost/spirit/home/support/terminal.hpp", line 231.13: 1540-0407 (S) The base class "to_nonlazy_arg<const char [4]>" contains a circular reference back to "to_nonlazy_arg<const char [4]>". "/usr/include/boost/boost/spirit/home/support/terminal.hpp", line 288.46: 1540-0700 (I) The previous message was produced while processing "struct boost_1_48_0::spirit::detail::to_nonlazy_arg<const char [4]>". "/usr/include/common/boost/boost/spirit/home/support/terminal.hpp", line 281.16: 1540-0700 (I) The previous message was produced while processing "struct boost_1_48_0::spirit::terminal<struct boost_1_48_0::spirit::tag::char_code<boost_1_48_0::spirit::tag::string,boost_1_48_0::spirit::char_encoding::standard> >::result_helper<0,const char [4],boost_1_48_0::spirit::unused_type,boost_1_48_0::spirit::unused_type>". "/usr/include/common/boost/boost/spirit/home/support/terminal.hpp", line 316.16: 1540-0700 (I) The previous message was produced while processing "struct boost_1_48_0::spirit::terminal<struct boost_1_48_0::spirit::tag::char_code<boost_1_48_0::spirit::tag::string,boost_1_48_0::spirit::char_encoding::standard> >::result<const char [4],boost_1_48_0::spirit::unused_type,boost_1_48_0::spirit::unused_type>". "/usr/include/common/boost/boost/spirit/home/support/terminal.hpp", line 248.12: 1540-0700 (I) The previous message was produced while processing "struct boost_1_48_0::spirit::terminal<boost_1_48_0::spirit::tag::char_code<boost_1_48_0::spirit::tag::string,boost_1_48_0::spirit::char_encoding::standard> >". "/usr/include/common/boost/boost/spirit/home/support/common_terminals.hpp", line 230.1: 1540-0700 (I) The previous message was produced while processing "boost_1_48_0::spirit::standard::string". But this code works absolutely fine on g++ Linux. Is this is a known bug on IBM ?Is any patch available ? Thanks in advance, Abc

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Problems with boost::this_thread::sleep(boost::posix_time::milliseconds(100)) on 64 bit platform.
by Serg V. Gulko 23 Jul '12

23 Jul '12

Hello! I was trying to recompile code which was working perfectly on CentOS 6 32 bit under same version of CentOS but for 64bit. boost version is 1.49.0. Problem is that this_thread::sleep return immediately on 64 bit machine... Only increasing sleep time to 3000 i was able to see real sleep. I saw that many people have same problem but is there a way to easily resolve it? Serg

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[BGL] Encountering "bad lexical cast" exception when reading a class from graphviz file
by Nicholas Mario Wardhana 23 Jul '12

23 Jul '12

Hi all, I am trying to read a graphviz file into my graph implementation. The minimum working code as well as the graphviz file are at the end of this e-mail. The node of the graph is the Vertex struct, which contains a point object (Point p). For Point class, I overload two operators, >> and <<, and operator << was previously used to generate the graphviz file. The operator overloads work well with std::cin and std::cout, but with the code below, I receive an exception: bad lexical cast: source type value could not be interpreted as target . The culprit might be in the << overload. In particular, when reading from a file, the value of iToBool1 is true, whereas iToBool2 is false. That is to say, the variable i might change when inserting the stream data to the point. This does not happen when reading from std::cin, as both variables are true. I convert the i variable, originally an istream, to bool because when the program returns to the calling function, which is lexical_stream_limited_src::shr_using_base_class on line 1616 in lexical_cast.hpp, this functions uses the return value of << operator in a boolean comparison. The value of iToBool2 being false eventually leads to calling BOOST_LCAST_THROW_BAD_CAST on line 1975. I wonder if somebody can tell me what is wrong with my operator overload? I use Boost 1.50 and Visual Studio 2008 on Windows 7. Thanks! Best regards, Nicholas //--------------------Graphviz-------------------- graph G { 1 [Point="1 2 3"]; } //----------------------code---------------------- #include <boost/graph/adjacency_list.hpp> #include <boost/property_map/dynamic_property_map.hpp> #include <boost/graph/graphviz.hpp> #include <iostream> #include <fstream> #include <string> struct Point { float x; float y; float z; inline friend std::istream& operator >> ( std::istream& i, Point& p ) { bool iToBool1 = i; i >> p.x >> p.y >> p.z; bool iToBool2 = i; return i; } inline friend std::ostream& operator << ( std::ostream& o, const Point& p ) { o << p.x << " " << p.y << " " << p.z; return o; } }; struct Vertex { int ID; Point p; }; struct Edge { int ID; }; typedef boost::adjacency_list< boost::listS, boost::vecS, boost::undirectedS, Vertex, // bundled data Edge, // bundled data boost::no_property, // not needed boost::listS> Graph; int main() { // Part 1: input via std::cin Point p; std::cin >> p; Graph graph; // Part 2: input from graphviz boost::dynamic_properties dynamicProperties; dynamicProperties.property("NodeID", boost::get(&Vertex::ID, graph)); dynamicProperties.property("Point", boost::get(&Vertex::p, graph)); dynamicProperties.property("EdgeID", boost::get(&Edge::ID, graph)); std::ifstream file("graph.txt"); try { boost::read_graphviz(file, graph, dynamicProperties, "NodeID"); } catch (std::exception& e) { std::cout << e.what() << std::endl; } return 0; }

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state machine frequence detecting
by Kraus Philipp 23 Jul '12

23 Jul '12

Hello, I need an idea for detecting frequencies. I have got an audio signal and I would check if a sequence of frequences are in the signal eg: I have got this frequencies: 100Hz, 600Hz, 800Hz, so I would create a statemachine that accepts this sequence of frequencies like frequence statemachin st; for each audio sample if signal has st.getFrequence then st.next else st.reset if st.final then accept Frequences and the order of the frequences are stored in a configuration file, so the state machine can have a lot of states. In some cases I can have got something like 100Hz, 600Hz, 800Hz, delay, 100Hz, 600Hz, 800Hz | 1 | | 2 | So the sequence must be accepted if one of the frequence block (1 || 2) is in the final state. I have read the howto about the Boost finale statemachine, but I can not make a decision if the Boost statemaschine is the correct structure to solve this problem. Can anyone help me to discuss the pro / cons for the Boost statemachine in this case? Thanks a lot Phil

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Extracting "friendly" information from boost::exception
by Andreas M. Iwanowski 22 Jul '12

22 Jul '12

Dear boost experts. We are using boost::exception in a project of ours, and are trying to extract some information from an exception to display to the user. For example, diagnostic_information(e) returns this: d:\projects\<project>\ClassName.cpp(376): Throw in function void __thiscall ClassName::CInetExceptionHandler<struct ClassName::BadLoginException>(class CInternetException *) const Dynamic exception type: class boost::exception_detail::clone_impl<struct ClassName::BadLoginException> std::exception::what: Unknown exception [struct tag_implementation_ClassName_SpecificInfo_errstr *] = Error: 12014 Context: 0 Message: The password was not allowed [struct tag_interface_CDataInterface_errstr *] = ClassName reports: Bad FTP login What I want is to extract "Error: 12014 Context: 0 Message: The password was not allowed" or "ClassName reports: Bad FTP login" from that exception. However, these exceptions may be generated in DLLs that the main program know nothing about. To simplify, here is what I do and want ot be happening: 1. Main program calls method in DLL 2. Main program knows this method can throw expections of type boost::exception 3. Main program catches such exception 4. Main program obtains string that is user-friendly from this exception Has anyone acccomplished this or knows how to extract the information from above (ideally not by parsing the string?) Alternatively, could I somehow fill the std::exception::what and then get that information out of boost::exception somehow? Thanks everyone! Mit freundlichen Gr??en / With best regards Andreas Iwanowski - IT Administrator www.awato.de<http://www.awato.de> | namezero(a)afim.info<mailto:namezero@afim.info> T: +49 (0)2133 2969 28 | F: +49 (0)2133 2969 69 awato Software GmbH | Salm Reifferscheidt Allee 37 | D-41540 Dormagen avisor-Support | T: +49 (0)621 6094 043 | F: +49 (0)621 6071 447 [awato Software GmbH] [cid:qrCode-58869986-5cab-4997-b473-f0c11a0058ad21bff0] Gesch?ftsf?hrer: Ursula Iwanowski | HRB: Neuss 7208 | VAT-no.: DE 122796158

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filesystem - test failures
by Robert Ramey 22 Jul '12

22 Jul '12

The boost serialization library tests use boost.filesystem. A number of test scenarios in the serialization library tests suite are really manifestations of failures in the boost filesystem library. a) msvc- 9.0~wm5~stlport5.2 - this combination fails at some level for lack of a file "io.h". b) does filesystem really require RTTI? at least a subset (and maybe more) of the serialization library tests should function in the absense of RTTI but now they all fail since all the tests use filesystem and this in turn depends upon RTTI. Robert Ramey

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code review
by Littlefield, Tyler 22 Jul '12

22 Jul '12

Hello all: I understand this may be a bit unusual, but any help/info would really be appreciated. Basically, here's what the problem is. I am using boost::asio to write a client and server for a game setup I want to work on. They're not communicating with each other, but more importantly, before I get way to far with this, since I am just learning boost::asio and everything else, I'd like to see if there is something I could be doing differently/better to make everything smoother. All the source is stuffed in a zip, and I posted it: http://tds-solutions.net/game.zip Any ideas, comments/suggestions/etc would really be appreciated. I'm also kind of interested in how I might go about tracking down the error where the client is not connecting to the server. On a side note, appologies for formatting errors. I'm blind, so it's not of huge importance to me, but I think I formatted all the code, so it should look ok visually. -- Take care, Ty http://tds-solutions.net The aspen project: a barebones light-weight mud engine: http://code.google.com/p/aspenmud He that will not reason is a bigot; he that cannot reason is a fool; he that dares not reason is a slave.

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[Program Options] Input information as std::string
by Nicholas Yue 22 Jul '12

22 Jul '12

Hi, I have a situation where I would like to parse the command line options not as (int argc, char **argv) template<typename charT> basic_parsed_options< charT > parse_command_line(int argc, const charT *const argv, const options_description &, int style = 0, function1< std::pair< std::string, std::string >, const std::string & > ext = ext_parser()); but as a std::string. The std::string is the equivalent of the command line but obtain either from reading some file or cut and paste. E.g. my input string would be something like "myprog 817382 --lod="lod.cfg" --radius=3.0" With such string as the above, I'd like to know how I should pass it to boost::program_options Regards -- Nicholas Yue Graphics - RenderMan, Visualization, OpenGL, HDF5 Custom Dev - C++ porting, OSX, Linux, Windows Management - Recruitment, career management http://www.proceduralinsight.com/ http://au.linkedin.com/in/nicholasyue

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boost::unordered_map and exceptions disabled
by Marcello Maggioni 22 Jul '12

22 Jul '12

Hello, I'm a user of boost::unordered_map and I always used this container with exceptions disabled (because I never use them and don't want them enabled if possible). I never had problems with that, but now with boost 1.50 and GCC 4.7.1 I get this error while compiling code using unordered_map: In file included from /usr/include/boost/unordered/unordered_map.hpp:17:0, from /usr/include/boost/unordered_map.hpp:16, from /home/hades/Bitral/include/CodeRegion.h:23, from /home/hades/Bitral/src/BitralContext.cpp:20: /usr/include/boost/unordered/detail/allocator_helpers.hpp: In instantiation of 'void boost::unordered::detail::construct_node(Alloc&, T*, const Args&) [with Alloc = std::allocator<boost::unordered::detail::ptr_node<std::pair<const Bitral::ConstantMemoryAddress, Bitral::CodeRegion*> > >; T = boost::unordered::detail::ptr_node<std::pair<const Bitral::ConstantMemoryAddress, Bitral::CodeRegion*> >; Args = boost::unordered::detail::emplace_args3<boost::unordered::piecewise_construct_t, boost::tuples::tuple<Bitral::ConstantMemoryAddress, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, boost::tuples::tuple<> >]': /usr/include/boost/unordered/detail/buckets.hpp:75:13: required from 'void boost::unordered::detail::node_constructor<NodeAlloc>::construct_value(const Args&) [with Args = boost::unordered::detail::emplace_args3<boost::unordered::piecewise_construct_t, boost::tuples::tuple<Bitral::ConstantMemoryAddress, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, boost::tuples::tuple<> >; NodeAlloc = std::allocator<boost::unordered::detail::ptr_node<std::pair<const Bitral::ConstantMemoryAddress, Bitral::CodeRegion*> > >]' /usr/include/boost/unordered/detail/unique.hpp:386:13: required 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 Bitral::ConstantMemoryAddress, Bitral::CodeRegion*> >, Bitral::ConstantMemoryAddress, Bitral::CodeRegion*, boost::hash<Bitral::ConstantMemoryAddress>, std::equal_to<Bitral::ConstantMemoryAddress> >; boost::unordered::detail::table_impl<Types>::value_type = std::pair<const Bitral::ConstantMemoryAddress, Bitral::CodeRegion*>; boost::unordered::detail::table_impl<Types>::key_type = Bitral::ConstantMemoryAddress]' /usr/include/boost/unordered/unordered_map.hpp:1196:26: required 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 = Bitral::ConstantMemoryAddress; T = Bitral::CodeRegion*; H = boost::hash<Bitral::ConstantMemoryAddress>; P = std::equal_to<Bitral::ConstantMemoryAddress>; A = std::allocator<std::pair<const Bitral::ConstantMemoryAddress, Bitral::CodeRegion*> >; boost::unordered::unordered_map<K, T, H, P, A>::mapped_type = Bitral::CodeRegion*; boost::unordered::unordered_map<K, T, H, P, A>::key_type = Bitral::ConstantMemoryAddress]' /home/hades/Bitral/src/BitralContext.cpp:30:31: required from here /usr/include/boost/unordered/detail/allocator_helpers.hpp:643:11: error: exception handling disabled, use -fexceptions to enable The strange thing is that compiling the code with CLANG 3.1 and exceptions explicitly disabled works fine. There is a way to make it work with exceptions disabled and G++? Thanks Marcello

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[type_traits] defining my own trait
by Brian Budge 21 Jul '12

21 Jul '12

Hi all - I am hoping to define my own type trait is_memcpyable. I'm trying to start off simple: template <typename T> struct is_memcpyable { static const bool value = boost::has_trivial_assign<T>::value; }; Then when I encounter types in my code that are safe to memcpy, but don't have a trivial assignment operator I can specialize the trait. I'm having trouble with inheritance and composition. I'm hoping someone can help. Here's a complete code sample: /***START OF SAMPLE***/ #include <Eigen/Dense> #include <iostream> template <typename T> struct is_memcpyable { static const bool value = boost::has_trivial_assign<T>::value; }; namespace boost { template<> struct has_trivial_assign<Eigen::Vector3f> : public true_type {}; } struct foo : public Eigen::Vector3f { foo() {} }; struct bar { bar(int i) : m_vec(float(i), float(i), float(i)) {} Eigen::Vector3f m_vec; }; int main(int argc, char **args) { std::cerr << "memcpyable int: " << is_memcpyable<int>::value << std::endl; std::cerr << "memcpyable v3f: " << is_memcpyable<Eigen::Vector3f>::value << std::endl; std::cerr << "memcpyable bar: " << is_memcpyable<bar>::value << std::endl; std::cerr << "memcpyable foo: " << is_memcpyable<foo>::value << std::endl; std::cerr << "trivial assign int: " << boost::has_trivial_assign<int>::value << std::endl; std::cerr << "trivial assign v3f: " << boost::has_trivial_assign<Eigen::Vector3f>::value << std::endl; std::cerr << "trivial assign bar: " << boost::has_trivial_assign<bar>::value << std::endl; std::cerr << "trivial assign foo: " << boost::has_trivial_assign<foo>::value << std::endl; return 0; } /***END OF SAMPLE***/ The Eigen library is set up to do nifty expression template goodness all over the place, which means that they implement operator = for the types in the library. However, once a value is assigned, the storage is fixed (at least for the Dense matrix types). The data layout is fixed, and internal storage is a small array of builtin types. What I would like to happen is that all 8 print statements should be true; however, the ones for bar and foo are false. I can explicitly set their type traits, but this quickly gets out of hand. I guess the real question is this: is there a way to define is_memcpyable so that the value is true if a class does not define operator=, and all of it's members or inherited types are also memcpyable? Thanks for any help. Brian

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