October 2010 - Boost-users - lists.preview.boost.org

[thread] documentation complaints
by Robert Ramey 21 Oct '10

21 Oct '10

I had occasion to look into the thread documentation after many years. It was in the course of explaining the benefits of using boost libraries to a programmer who was unfamiliar with them. Somehow I remember the old documentation as being much more helpful. I think I remember tutorials and a faq explaining things why semaphores weren't inlcuded etc. I remember finding this to be very helpful. My original interest in boost was sparked by reading this documentation. The current system seems more complete and the documention more formal and correct. But it needs tutorials which explain how to use the library to solve problems and to explain the examples. It also needs a section to explain the design decisions. Robert Ramey

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foreach question
by Neal Becker 21 Oct '10

21 Oct '10

The following loop iterates over strings in result (which comes from boost::split). Is there a way to include the integer enumerator 'col' into the FOREACH loop? In python that would be spelled for col,s in enumerate (result): ... int col = 0; BOOST_FOREACH (std::string s, result) { H(row, col) = boost::lexical_cast<int> (s); ++col; }

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[Variant] Tree like structure with variant
by dariomt＠gmail.com 21 Oct '10

21 Oct '10

Hi all, I need a tree-like structure like the following boost::variant< int, std::vector<tree>, std::map<std::string, tree> > tree; So, my tree can have an int, or a list of trees, or a map of trees. Of course this is not possible, and I've been trying to use boost::recursive_wrapper. I have looked at the example in the documentation, but and I'm not able to achieve what I want. My feeling is that I'm missing an extra 'node' level somewhere, but since all the types I'm using are typedefs, I cannot forward delcare it to break the cyclic reference... I would appreciate help with this. Thanks in advance.

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Passing a boost::unordered_set as the result map to boost::split
by Jeremy Stribling 21 Oct '10

21 Oct '10

Anyone here know the answer to this question? http://stackoverflow.com/questions/3981123/passing-a-boostunordered-set-as-… Thanks, Jeremy

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[PropertyTree] Adding comments to existing property tree object
by René Perlberg 21 Oct '10

21 Oct '10

Hello to everyone, I wonder whether it is possible to add comments to an existing property tree object. To be more specific: I read in some XML files and change some attribute values (both relaized using property tree). In addition to that I would like to add some comments to a specific path in the property tree. Looking inside the code of property tree I found a function 'write_xml_comment', but I'm not sure whether and how this function may be used to address my problem. With kind regards, René.

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[ASIO] Problem with reading of serial ports using ASIO
by Jim Donaldson 20 Oct '10

20 Oct '10

Hi All, I'm having some problems using Boost ASIO on Windows XPSP3, 32 bit. I'm trying to set-up an asynchronous read from a serial port on the computer (actually a USB port masquerading as a serial port). The code is at http://gist.github.com/634618 We regularly call the function PCTimeoutUart::wait( iseSize_t len, uint32 timeoutInMS ) which wraps the calls to the boost asio libraries. This creates a deadline_timer, and binds it to our timeout callback (PCTimeoutUart::finishedTimer) It also calls async_read_some on the boost::asio::serial_port object m_port to read the required length, and binds that to the PCTimeoutUart::finishedRead callback. We call the runone() function on m_io, which is declared in the header as a boost::asio::io_service and has been passed to both the timer and serial port's constructors. We continually call this in a loop until either m_timedOut has been set by the asynchronous call back to PCTimeoutUart::finishedTimer or m_finishedRead has been set via the call back to PCTimeoutUart::finishedRead Normally, this works well. However, there are certain scenarios when it fails to write anything to the buffer, despite the fact that finishedRead() is called with error = 0 and the correct length . I've checked by initializing the buffers with a couple of different values and each time, it's clear that the buffer is being passed back without those values being altered. Strangely, it is always when the string sent by the external device is '\r\nNACK:XX\r\n' where XX is a 2 character ascii number. I've got portmon running on the serial port and it confirms that the data has been correctly received from the external device. We've debugged it as far as putting a break-point on line 71 and at that point can see that the system thinks that a read is complete, n bytes have been returned, but only some of those bytes are in buffer. If anyone could offer any views on why we may be having problems, or places that we could look, then that would be very much appreciated. Thanks in advance, Jim

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Methods prefixed by cdecl?
by Ven Tadipatri 20 Oct '10

20 Oct '10

Hi, I'm using Windows 7 (64 bit) and I'm trying to compile and link my code against the regex libraries. It compiles fine, but at link time, it can't find any of the methods in the regex library. But the methods it's looking for are prefixed by "__cdecl". I've tried compiling my code with the /Gd and /Gz options, and neither seemed to work. Here's what the error looks like: [ERROR] ResourceURI.obj : error LNK2019: unresolved external symbol "private: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __cdecl boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::do_assign(char const *,char const *,unsigned int)" (?do_assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@AEAAAEAV12@PEBD0I@Z) referenced in function "public: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __cdecl boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::assign(char const *,char const *,unsigned int)" (?assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@QEAAAEAV12@PEBD0I@Z) [ERROR] ResourceService.obj : error LNK2001: unresolved external symbol "private: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __cdecl boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::do_assign(char const *,char const *,unsigned int)" (?do_assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@AEAAAEAV12@PEBD0I@Z) [ERROR] AtomicParsingExpression.obj : error LNK2001: unresolved external symbol "private: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __cdecl boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::do_assign(char const *,char const *,unsigned int)" (?do_assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@AEAAAEAV12@PEBD0I@Z) [ERROR] AbstractLoopingVariable.obj : error LNK2001: unresolved external symbol "private: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __cdecl boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::do_assign(char const *,char const *,unsigned int)" (?do_assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@AEAAAEAV12@PEBD0I@Z) When I do a dumpbin /symbols on the regex library I built, it does contain the methods above (as far as I can tell) 26F 00000000 SECT92 notype () External | ?assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@QAEAAV1 2@PBD0I@Z (public: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __thiscall boost: :basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::assign(char const *,char const *,unsigned int)) CB4 00000000 SECT40D notype () External | ?do_assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@AAEAAV12@PBD0I@Z (private: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __thiscall boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::do_assign(char const *,char const *,unsigned int)) Any ideas on how to get my programs to link against the methods in the regex library? Thanks, Ven

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Boost Fiber Compile error -- Boost task
by Glenn Macgregor 20 Oct '10

20 Oct '10

Hi All, I am in the process of trying to get boost task compiled and working with Boost 1.43.0. As far as I can tell it relies on boost fiber and boost context as well so I got them from the boost vault. I am using: * boost.context-0.2.0 * boost.fiber-0.5.1 * boost.task-0.4.2 I have copied these into my boost 1.43.0 build area and have run bjam as normal: Component configuration: - context : not building - date_time : not building - fiber : building - filesystem : not building - graph : not building - graph_parallel : not building - iostreams : not building - math : not building - mpi : not building - program_options : not building - python : not building - random : not building - regex : not building - serialization : not building - signals : not building - system : not building - task : not building - test : not building - thread : not building - wave : not building Below is the first couple errors I get but all of the following errors are of the same type: .\boost/fiber/strategy.hpp(123) : error C2492: 'boost::fibers::strategy::active_ fiber' : 'thread' data may not have dll interface .\boost/fiber/strategy.hpp(123) : error C2492: 'protected: static boost::fibers: :fiber * boost::fibers::strategy::active_fiber' : 'thread' data may not have dll Interface This seems to have to do with the __declspec(thread) but I am not very familiar with that so I can't really do much debugging. My build environment is: Windows XP64 VisualStudio 2008 Thanks in advance for any help. Glenn

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DLL Load Failed
by Monde, John 20 Oct '10

20 Oct '10

Hi, I am having a problem moving my boost python extension to a different machine than my development machine. On my development machine everything works great, I can access my C++ classes through python without any problems but when I copy my .pyd (Python_ext.pyd) to my target machine I get the error "DLL Load failed The specified module could not be found" in my Python program when I attempt to import the .pyd (import Python_ext) I am using Boost_1_42. The .pyd was built using BJAM and my compiler is MSVS 2003 and python26. Python26 is on both the development and the target machine. I had similar problem when I moved my python .pyd extension module to a different directory on my development machine but I fixed that by copying the boost dll boost_python-vc71-mt-gd-1_42.dll to the directory with my .pyd module and it ran great there. I tried to do the same thing on my target machine. I copied my python program, the .pyd extension module and the boost DLL (boost_python-vc71-mt-gd-1_42.dll) to the same directory on my target machine and still get the same error. Both machines are windows XP. To test this I am using a simple test C++ class that just receives two numbers and prints out there sum so I do not believe I am bringing in any other dlls. I am sure this is a simple problem and I am just missing it. Any help would be greatly appreciated. Thanks John

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[spirit::qi] assertion during parsing
by Ovanes Markarian 20 Oct '10

20 Oct '10

Hello *, I have a strange problem. When parsing some output boost::spirit::qi parser aborts the application stating the following error message: /local/include/boost/spirit/home/support/char_encoding/ascii.hpp:256: static int boost::spirit::char_encoding::ascii::isspace(int): Assertion `isascii_(ch)' failed. Indeed my input sequence is: ~B"þ¯Þº~N But is it really a reason to assert the parser and crash the app? This input would not match my grammar, so from my point of view (as library user) it is just fine: not to match the input, without any assertions. And I should be able to decide what to do next. I use boost 1.44 with gcc (GCC) 3.4.6 20060404 (Red Hat 3.4.6-11) Many thanks for support, Ovanes

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How to run boost.Test iteratively?
by Gaurav N Shah 20 Oct '10

20 Oct '10

void test1() { BOOST_CHECK(2 == 1); } bool init_test() { boost::unit_test::test_suite* ts1 = BOOST_TEST_SUITE( "test_suite1" ); ts1->add(BOOST_TEST_CASE(&test1)); ::boost::framework::master_test_suite().add(ts1); return true; } int main(int argc, char* argv[]) { boost::unit_test::unit_test_main(&init_test, argc, argv); //1st attempt sleep(1 mins) boost::unit_test::unit_test_main(&init_test, argc, argv); //2nd attempt } On first attempt test case runs fine. However, on second attempt I get below error: *** 1 failure detected in test suite "Master Test Suite" Test setup error: Fail to process runtime parameters: Definition of parameter auto_start_dbg conflicts with defintion of parameter auto_start_dbg Usage: TestProject.exe [{--auto_start_dbg=|-d }[yes|y|no|n]] [--break_exec_path=<value>] [{--build_info=|-i }[yes|y|no|n]] [{--catch_s ystem_errors=|-s }[yes|y|no|n]] [--detect_fp_exceptions=[yes|y|no|n]] [--detect_memory_leaks=<value>] [{--log_format=|-f }<value>] [{--log_level=|-l }<value>] [{--output_format=|-o }<value>] [{--random=|-a }[<value>]] [{--report_format=|-m }<value>] [{--report_l evel=|-r }<value>] [{--result_code=|-c }[yes|y|no|n]] [{--run_test=|-t }<value>] [--save_pattern=[yes|y|no|n]] [{--show_progress=|- p }[yes|y|no|n]] [--use_alt_stack=[yes|y|no|n]] [{--help=|-? }[yes|y|no|n]] Why this occurs and How this can be avoided? Thank You, Gaurav This communication is for informational purposes only. It is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction. All market prices, data and other information are not warranted as to completeness or accuracy and are subject to change without notice. Any comments or statements made herein do not necessarily reflect those of JPMorgan Chase & Co., its subsidiaries and affiliates. This transmission may contain information that is privileged, confidential, legally privileged, and/or exempt from disclosure under applicable law. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the information contained herein (including any reliance thereon) is STRICTLY PROHIBITED. Although this transmission and any attachments are believed to be free of any virus or other defect that might affect any computer system into which it is received and opened, it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by JPMorgan Chase & Co., its subsidiaries and affiliates, as applicable, for any loss or damage arising in any way from its use. If you received this transmission in error, please immediately contact the sender and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. Please refer to http://www.jpmorgan.com/pages/disclosures for disclosures relating to European legal entities.

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[Boost.Spirit] Synthesised attributes and sub-rules
by Vitaly Budovski 20 Oct '10

20 Oct '10

Hi, Please have a look at the code below. I would like to be able to split up the start rule into several sub-rules (currently commented out). The problem is, I'm not sure how to reference the synthesised attribute from the grammar in these sub-rules? Is it possible? I would like to do this so that the grammar is more readable, as the actual rules have a bit more complexity than in this simple example. Thank you, Vitaly ---------------- #include <boost/spirit/home/phoenix/bind/bind_function.hpp> #include <boost/spirit/include/phoenix_core.hpp> #include <boost/spirit/include/phoenix_operator.hpp> #include <boost/spirit/include/qi.hpp> #include <boost/tuple/tuple.hpp> #include <algorithm> #include <iterator> #include <string> #include <vector> using namespace boost::spirit; using namespace boost::spirit::qi; struct a_: qi::symbols<char, int> { a_() { add ("A", 0) ("B", 1) ("C", 2) ; } } a; struct b_: qi::symbols<char, boost::tuple<int, int> > { b_() { add ("x", boost::make_tuple(3, 2)) ("y", boost::make_tuple(4, 0)) ("z", boost::make_tuple(5, 1)) ; } } b; struct c_: qi::symbols<char, int> { c_() { add ("E", 6) ("D", 7) ("J", 8) ; } } c; void insert_a(const int &value, const boost::optional<unsigned int> &count, std::vector<int> &result) { unsigned int c = 1; if(count) { c += *count; } for(unsigned int i = 0; i < c; ++i) { result.push_back(value); } } void insert_b(const boost::tuple<int, int> &value, const boost::optional<unsigned int> &count, std::vector<int> &result) { unsigned int c = 1; if(count) { c += *count; } for(unsigned int i = 0; i < c; ++i) { result.push_back(value.get<0>()); result.push_back(value.get<1>()); } } void insert_c(const int &value, const boost::optional<unsigned int> &count, std::vector<int> &result) { unsigned int c = 1; if(count) { c += *count; } for(unsigned int i = 0; i < c; ++i) { result.push_back(value); } } template<typename Iterator> struct test_grammar: qi::grammar<Iterator, std::vector<int>()> { test_grammar(): test_grammar::base_type(start) { using boost::phoenix::bind; /*a_rule = ( +(a >> -uint_)[bind(insert_a, _1, _2, _val)] ) ; b_rule = ( +(b >> -uint_)[bind(insert_b, _1, _2, _val)] ) ; c_rule = ( +(c >> -uint_)[bind(insert_c, _1, _2, _val)] ) ;*/ start = ( +(a >> -uint_)[bind(insert_a, _1, _2, _val)] | +(b >> -uint_)[bind(insert_b, _1, _2, _val)] | +(c >> -uint_)[bind(insert_c, _1, _2, _val)] ) ; } qi::rule<Iterator> a_rule; qi::rule<Iterator> b_rule; qi::rule<Iterator> c_rule; qi::rule<Iterator, std::vector<int>()> start; }; int main() { std::string s("A3BAC6"); typedef std::string::iterator string_iterator; string_iterator first = s.begin(); string_iterator last = s.end(); typedef test_grammar<string_iterator> test_grammar; test_grammar test_parser; std::vector<int> v; bool result = parse(first, last, test_parser, v); if(result && first == last) { std::copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, " ")); std::cout << std::endl; } else { std::cerr << "Failed to parse expression\n"; v.clear(); } std::string s2("xy2z3"); string_iterator first2 = s2.begin(); string_iterator last2 = s2.end(); bool result2 = parse(first2, last2, test_parser, v); if(result2 && first2 == last2) { std::copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, " ")); std::cout << std::endl; } else { std::cerr << "Failed to parse expression\n"; v.clear(); } std::string s3("EDJ"); string_iterator first3 = s3.begin(); string_iterator last3 = s3.end(); bool result3 = parse(first3, last3, test_parser, v); if(result3 && first3 == last3) { std::copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, " ")); std::cout << std::endl; } else { std::cerr << "Failed to parse expression\n"; v.clear(); } return 0; }

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boost.MPI dynamic data structure error
by Jack Bryan 20 Oct '10

20 Oct '10

Hi , I need to design a data structure to transfer data between nodes by boost.MPI. Some elements of the the structure has dynamic size. For example, typedef struct{ double data1;vector<double> dataVec; } myDataType; The size of the dataVec depends on some intermidiate computing results. If I only declear it as the above myDataType, I think, only a pointer is transfered. When the data receiver try to access the elements of vector<double> dataVec, it got segmentation fault error. But, I also need to use the myDataType to declear other data structures. such as vector<myDataType> newDataVec; I cannot declear myDataType in a function , sucjh as main(), I got errors: main.cpp:200: error: main(int, char**)::myDataType; uses local type main(int, char**)::myDataType; Any help is really appreciated. thanks Jack Oct. 19 2010

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Question about Boost License and commercial software
by marc_elias＠terra.es 20 Oct '10

20 Oct '10

Hi, I'm working in a company that want to use boost libraries to a commercial software. I have a pair of questions: 1. Is it possible to distribute under the boost license a commercial software (so the source code won't be exposed) programmed with static boost libraries? 2. And with linked libraries to an executable? Thanks in advance! MARC

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[Regex] This pattern compiles fine for Perl and PCRE but not for Boost Regex
by David Dawe 20 Oct '10

20 Oct '10

Boost Regex fails to compile a regular expression such as "{abc}" with the error "Invalid content of repeat range". However, both Perl and PCRE accept the regular expression, treating the "{" as a literal character. The PCRE man page at http://www.pcre.org/pcre.txt clearly states: An opening curly bracket that appears in a position where a quantifier is not allowed, or one that does not match the syntax of a quantifier, is taken as a literal character. The Perl regular expression man page at http://perldoc.perl.org/perlre.html is similar, though not quite as clear: If a curly bracket occurs in any other context, it is treated as a regular character. In particular, the lower bound is not optional. Nevertheless, the behaviour of both PCRE and Perl are the same. I am currently using Boost 1.39, but I have seen no mention of a change in this area for more recent versions of Boost Regex. And finally ... my question ... Is there a way in Boost Regex to interpret a "{" as a literal character in the above context in a Perl regular expression, while still allowing the "{n,m}" bounded repeat in places where it is syntactically valid? Thanks.

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boost::thread_resource_error
by Julien Martin 19 Oct '10

19 Oct '10

Hello, I am encountering the following error: ********************************** terminate called after throwing an instance of 'boost::thread_resource_error' what(): boost::thread_resource_error Abandon ********************************** trying to run a threadgroup of 500 threads as follows: thread_group * thgrp = new thread_group(); for (int i = 0; i < NUMTHREADS; i++) { thgrp->create_thread(bind(&simulate, i, 100, 0.05, 0.2, 1.0, 100, 100, endPrices)); } thgrp->join_all(); Can anyone please help. I don't understand why I get this error as I have no resource problems with my machine. Julien.

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dynamic_bitset: request to add find_last() function
by Hicham Mouline 19 Oct '10

19 Oct '10

Hello As there is a find_first() function, is there a way to get a find_last() which returns the index of the most significant bit that is on? Regards,

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[boost] [serialization] Braking change with BOOST_CLASS_EXPORT
by petke himself 19 Oct '10

19 Oct '10

Hi, I noticed a breaking change / bug with boost serialization. (I hope this is the right mailinglist for bug reports) Upgrading from boost-1.35.0 to boost_1_44_0.. and I got compilation errors with the BOOST_CLASS_EXPORT macro. I did not write the user code so i dont know anything about the library, but it turns out BOOST_CLASS_EXPORT was called from inside several user namespaces. This meant the macro would try and specialize the template 'somens1::somens2::somens3::boost::serialization::guid_defined', which obviously does not exist. Placing the BOOST_CLASS_EXPORT macro outside of any user namespace solved the compile error. Im not sure why this worked in the old version of boost. But maybe it would be an idea to change the BOOST_CLASS_EXPORT macro, if possible, so that it jumps back into the root namespace. Should be as simple as replacing any "boost::serialization" with "::boost::serialization", right? The error message on VS2008 was: [exec] 1>xxx.h(67) : error C2143: syntax error : missing ';' before '<' [exec] 1>xxx.h(67) : error C2913: explicit specialization; 'somens1::somens2::somens3::boost::serialization::guid_defined' is not a specialization of a class template [exec] 1>xxx.h(67) : error C2059: syntax error : '<' [exec] 1>xxx.h(67) : error C3083: 'mpl': the symbol to the left of a '::' must be a type [exec] 1>xxx.h(67) : error C2039: 'true_' : is not a member of 'somens1::somens2::somens3::boost' [exec] 1>xxx.h(67) : error C2470: 'true_' : looks like a function definition, but there is no parameter list; skipping apparent body [exec] 1>xxx.h(67) : fatal error C1903: unable to recover from previous error(s); stopping compilation Regards, Patrik

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Beginner needs help with Boost thread class
by Julien Martin 19 Oct '10

19 Oct '10

Hello, I am completely new to Boost and I would like to know in which method to put the business logic (work) of my thread class (which inherits from boost::thread). When you do that in Java you implement Runnable and put the business logic in the run() method. How do I do that with boost? Thanks in advance, Julien.

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Fwd: [Graph] Problem with dynamic_properties
by fokenrute 19 Oct '10

19 Oct '10

Hi everybody, I'm new to BGL and very frustrated beacause I can't make a proper use of dynamic_properties. I'm just trying to read a graphviz dot file with read_graphviz and I found a sample which make use of dynamic_properties in order to make a proper call to read_grahviz. Here is the slightly modified sample: typedef boost::adjacency_list < boost::listS, boost::vecS, boost::undirectedS > Graph; typedef boost::graph_traits<Graph>::vertex_descriptor Vertex; typedef boost::graph_traits<Graph>::vertex_iterator Iterator; int main(int argc, char **argv) { Graph g; std::ifstream input(argv[1]); boost::dynamic_properties dp; dp.property("node_id", boost::get(boost::vertex_name, g)); dp.property("weight", boost::get(boost::edge_weight, g)); boost::read_graphviz(input, g, dp, "id"); return 0; } When I try to compile it, g++ returns lots of cryptic template related error messages but I suspect the most relevant part is : no match for 'operator<<' in 'out << boost::get...' I must be doing something wrong, but I can't get it; expect you'll point me out my mistake so that I could re-focus on the algorithms instead of these annoying technical details.

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[review result] mini-review of update to Boost.Assign
by Thorsten Ottosen 19 Oct '10

19 Oct '10

Dear all, Here follows the result of the result of Erwann Rogard's update to Boost.Assign: **************************** The update is not accepted **************************** This is not because the new functioanlity/interface was not seen as an improvement, but because Erwann has chosen to implement a full replacement (or Assign v2) based on the feedback he got during the review. The feedback meant that the new "update" would be much larger than what was present in the mini-review, and the new library should therefore be subject of its own full review. I would like to thank Erwann for his hard work so far, and hope he submits a Boost.Assign v2 in the near future. I would also like to thank the following people who participated in the mini-review: Christopher Jefferson Diederick C. Niehorster John Bytheway kind regards Thorsten, review manager

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Changing the priority of a thread
by Jean-Sebastien Stoezel 19 Oct '10

19 Oct '10

Hello, Is it possible to change the priority of the boost::thread in windows? How do you do it? Thanks, Jean

2 1

Tokenizing UTF-8
by Roshan Naik 19 Oct '10

19 Oct '10

I was looking around to see if Boost has support for tokenizing UTF-8 strings. I don't see any mention of UTF-8 or Unicode in the Boost.Tokenizer documentation. If not Boost.Tokenizer . any other ideas ? I am also looking into ICU. Thanks. - Roshan

2 1

[fusion][mpl] Generating a fusion sequence type from an MPL sequence
by Gabriel Redner 19 Oct '10

19 Oct '10

Hi all, I am unexpectedly stuck looking for some functionality which I assumed would be present. Given an MPL sequence, I want to generate the type of a corresponding fusion sequence, which I can then use to store things: mpl::vector<int, string> mpl_vec; typedef some_metafunction<mpl_vec>::type fusion_vec; // equivalent to fusion::vector<int, string> fusion_vec vec(5, "foo"); Does some_metafunction exist? I'm not sure if I'm just not seeing it (or perhaps thinking wrongly about the problem), or if it really is not present. I was looking at the fusion/mpl bridge at [1], but its functionality seems orthogonal to what I want. Thanks, -Gabe [1] http://www.boost.org/doc/libs/1_44_0/libs/fusion/doc/html/fusion/adapted/mp…

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[serialization] linker error with static build of serialization on Mingw gcc 4.4.0
by Philipp Münzel 18 Oct '10

18 Oct '10

Hi fellow users, I build boost 1.43 on windows, using mingw with gcc 4.4.0: Using built-in specs. Target: mingw32 Configured with: ../gcc-4.4.0/configure --enable-languages=c,ada,c++,fortran,java,objc,obj-c++ --disable-sjlj-exceptions --enable-shared --enable-libgcj --enable-libgomp --with-dwarf2 --disable-win32-registry --enable-libstdcxx-debug --enable-version-specific-runtime-libs --prefix=/mingw --with-gmp=/mingw/src/gmp/root --with-mpfr=/mingw/src/mpfr/root --build=mingw32 Thread model: win32 gcc version 4.4.0 (GCC) with the following command: bjam.exe install -q --layout=system --with-system --with-thread --with-python --with-serialization toolset=gcc variant=release link=static threading=multi runtime-link=static When I now build a shared library, itself linking statically the libboost_serialization.a, I get the following linker error: Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_iarchiveEEE12get_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_iarchiveEEE12is_destroyedEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_iarchiveEEE18get_const_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_iarchiveEEE20get_mutable_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_oarchiveEEE12get_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_oarchiveEEE12is_destroyedEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_oarchiveEEE18get_const_instanceEv: symbol not found Cannot export _ZN5boost13serialization9singletonINS_7archive6detail12_GLOBAL__N_ 13mapI24portable_binary_oarchiveEEE20get_mutable_instanceEv: symbol not found collect2: ld returned 1 exit status Am I missing some build step? Regards, Philipp

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