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boost::trim throwing std::bad_cast exeption with custom basic_string
by Arash Abghari 24 Jan '11

24 Jan '11

Hi, I have a custom basic_string as follows: typedef basic_string<unsigned int> ustring; so if I pass an instance of ustring to boost:trim it throws an std::bad_cast exception. ustring str; boost::trim(str); The exception comes from here: include/boost/algorithm/string/detail/classification.hpp:45 return std::use_facet< std::ctype<CharT> >(m_Locale).is( m_Type, Ch ); It does not matter what character type I use for basic_string, It throws the exception for anything but char and wchar_t. Document mentions "A string is not restricted to std::basic_string and character does not have to be char or wchar_t, although these are most common candidates", So I assume, It must work with unsigned int or other types. Here is the system spec: boost: 1.40 gcc: 4.3.4 OS: Debian Lenny 64bit Thanks

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Re: [Boost-users] [Fusion] Building parameter list for fusion::invoke
by Vivek 24 Jan '11

24 Jan '11

> > 2011/1/22 Vivek <vivek_at_[hidden]> > Or alternatively, is there a direct way to initialize a fusion vector? IIUC, its ctor just do the job, not? The problem is I don't know the arity or parameter types of the function being called. I just have a source of data (which can be simplified to TYPE data = data_source<TYPE>().pop();) and arbitrary functions being passed in. One alternative is to code-generate template specializations for a bunch of arity and use the constructor like you suggested. But I feel the "arity code generation" thing has been done so many times and so much better in boost that I should be able to use a transform or invoke function to take advantage of that. That's why I started trying to use fusion.

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Re: [Boost-users] [Preprocessor] Relative Addresses in BOOST_PP_FILENAME_1
by Hossein Haeri 24 Jan '11

24 Jan '11

Hi TONGARI, > > #define BOOST_PP_FILENAME_1 "./Header.hpp" //1 > > #define BOOST_PP_FILENAME_1 ".\Header.hpp" //2 > > #define BOOST_PP_FILENAME_1 "Header.hpp" //3 > I have the same problem with you, I also use GCC 4.5.1, while <> works > fine but "" not. Strangely enough, <> doesn't work in my GCC either. (And, I'm not writing a precompiled header anyway.) Are you also using GCC under MinGW32? TIA, --Hossein

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Help me out from boost.log
by Steven Woody 23 Jan '11

23 Jan '11

Hi, I want to use boost.log and I succeeded in building it with bjam with Visual Studio 2005. But I quickly found I cannot use it. Below code are from the tutorial, #include <boost/log/core.hpp> #include <boost/log/trivial.hpp> #include <boost/log/filters.hpp> logging::core::init_log_to_file( keywords::file_name = "dsttest_%N.log", keywords::rotation_size = 10 * 1024 * 1024, keywords::time_based_rotation = sinks::file::rotation_at_time_point(0, 0, 0), keywords::format = "[%TimeStamp%]: %_%" ); logging::core::get()->set_filter( flt::attr<logging::trivial::severity_level>("Severity") >= loggin::trivial::debug ); but the compiler (vc++ 8.0) just complains: error C2653: 'logging' : is not a class or namespace name error C2653: 'keywords' : is not a class or namespace name ... I tried to use boost::log::logging, but it did not help. Then I decided to try the most simple code: BOOST_LOG_TRIVIAL(debug) << "hello boost.log"; it passed the compiler but not the linker: libboost_log-vc80-mt-gd-1_45.lib(trivial.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::generic_category(void)" (?generic_category@system@boost@@YAABVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'posix_category''(void)" (??__Eposix_category@system@boost@@YAXXZ) .... Please help me! Thanks in advance. -- Life is the only flaw in an otherwise perfect nonexistence -- Schopenhauer narke public key at http://subkeys.pgp.net:11371 (narkewoody(a)gmail.com)

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troubles with boost filtering streams
by Daniel Oberhoff 23 Jan '11

23 Jan '11

Hi, I am working on a matlab file reader/writer. Since matlab uses zip to compress variables I was thinking I could use the boost filtering streams with the zip filter to handle that. The use case is that there are zipped blocks inside the file, i.e. not the whole file is zipped but just parts. I am not sure how to handle that with boost, since I would need to start/stop zipping/unzipping at almost arbitrary points in the file. Also I have trouble working with filtering streams at all. As a baseline test I started substituting the fstream I was reading from with a boost filtering istream onto which I pushed the fstream. Reading works fine for a while and then breaks. What I noted is that the fstream tellg always lags behind the actual number of bytes read. also using the fitlering streams tellg breaks the whole stream. also seeking does not seem to work with the filtering stream. I need to seek quite often. seeking only happens when not unzipping. I tried seeking on the fstream instead. that worked up to some point(as stated above). I fear the seeking on the fstream breaks the filtering stream, but seeking on the filtering stream doesn't work. If anyone has pointers that would be great. Best Daniel

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Random permutations using boost::random_number_generator and std::random_shuffle.
by Matthew Gwynne 23 Jan '11

23 Jan '11

Hi, We need the ability to randomly permute some range, and we already have this functionality available in the computer algebra system Maxima. We use Maxima for numerous things, often implementing basic algorithms in it, then later writing more efficient versions in C++. The problem we have is that we'd like to be able to make sure that any function we write to randomly shuffle a range, matches up with the Maxima "random_permutation" function. We believe it uses the Mersenne twister (boost::mt19937) and Knuth shuffle algorithms, and so we thought to implement these in C++ using boost::uniform_distribution, boost:variate_generator etc. However, we have two questions (open problems): 1) How does boost::variate_generator interact with mt19937, and the distribution? Is this documented somewhere? In the attached code, it seems we can construct boost::uniform_distribution with any maximum value, and still the number generator returns values outside of that range? Is this really right? 2) What algorithm does std::random_shuffle implement? (Not boost related specifically but hopefully someone will know) Is this defined by the C++ standard? It doesn't seem to be the simple Knuth shuffle algorithm (starting from top of range to bottom or vice versa) as we implement in the attached code. If anyone could point me in the right direction, I'd very much appreciate it. Thanks Matthew Gwynne http://cs.swan.ac.uk/~csmg/ Code: #include <vector> #include <iostream> #include <algorithm> #include <iterator> #include <cassert> #include <boost/lexical_cast.hpp> #include <boost/random/mersenne_twister.hpp> #include <boost/random/uniform_int.hpp> #include <boost/random/variate_generator.hpp> #include <boost/random/random_number_generator.hpp> namespace { enum { errcode_parameter = 1 }; const std::string program = "RandomShuffle"; const std::string err = "ERROR[" + program + "]: "; const std::string version = "0.0.3"; const int default_seed = 1; typedef boost::mt19937 base_generator_type; base_generator_type base_rand_gen; inline void set_random(const int seed) { assert(seed >= 1); base_rand_gen.seed(seed); } const unsigned int default_N = 10; typedef std::vector<int> vec_t; inline void initialise(vec_t& a) { for (unsigned int i = 0; i < a.size(); ++i) a[i] = i+1; } inline void output(const vec_t& a) { for (unsigned int i = 0; i < a.size(); ++i) std::cout << a[i] << " "; std::cout << "\n"; } template <class RandomAccessIterator, class RandomNumberGenerator> inline void random_shuffle(const RandomAccessIterator first, const RandomAccessIterator last, RandomNumberGenerator& rand) { typedef typename std::iterator_traits<RandomAccessIterator>::difference_type difference_type; difference_type n = last - first; assert(n >= 0); if (n <= 1) return; for (RandomAccessIterator i = first; i != last-1; ++i,--n) { const difference_type r = rand(n); assert(r >= 0); assert(r < n); std::iter_swap(i, i+r); } assert(n == 1); } } int main(const int argc, const char* const argv[]) { if (argc > 3) { std::cerr << err << "\n At most two arguments are allowed " "(the seed for the random-number generator and the number of elements).\n"; return errcode_parameter; } const int seed = (argc == 1) ? default_seed : boost::lexical_cast<int>(argv[1]); const unsigned int N = (argc < 3) ? default_N : boost::lexical_cast<unsigned int>(argv[2]); vec_t V(N); typedef boost::uniform_int<> uniform_distribution_type; uniform_distribution_type uniform_distribution(0,std::numeric_limits<int>::max()); // is this correct??? typedef boost::variate_generator<base_generator_type&, uniform_distribution_type> generator_type; generator_type rand_gen(base_rand_gen, uniform_distribution); typedef boost::random_number_generator<generator_type> RandomNumberGenerator; RandomNumberGenerator rg(rand_gen); set_random(seed); std::cout << "Underlying random sequence:\n"; for (long n = V.size(); n > 1; --n) std::cout << rg(n) << " "; std::cout << "\n\n"; initialise(V); set_random(seed); std::random_shuffle(V.begin(), V.end(), rg); std::cout << "std::random_shuffle:\n"; output(V); initialise(V); set_random(seed); ::random_shuffle(V.begin(), V.end(), rg); std::cout << "::random_shuffle:\n"; output(V); }

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[Boost 1.34] Unsatisfied symbol "boost::thread::~thread()
by Alexander Vinokur 23 Jan '11

23 Jan '11

Hi, I have the following problem. Boost 1.34 HP-UX B.11.23 U ia64 aCC: HP C/aC++ B3910B A.06.25.01 [May 16 2010] // ------ vvv1.cpp ------ #include <boost/thread.hpp> void tproc() {} int main() { boost::thread t(tproc); t.join(); return 0; } // ----------------------- Compilation-1. > aCC +DD64 -AA -mt -I$BOOST_HOME vvv1.cpp ld: Unsatisfied symbol "boost::thread::~thread()(complete)" in file vvv1.o ld: Unsatisfied symbol "boost::thread::thread(boost::function0<void,std::allocator<boost::function_base> > const&)(complete)" in file vvv1.o ld: Unsatisfied symbol "boost::thread::join()" in file vvv1.o 3 errors. Compilation-2. > aCC +DD64 -AA -mt -lboost_thread-mt -I$BOOST_HOME vvv1.cpp ld: Can't find library for -lboost_thread-mt Fatal error. What is wrong? Thanks Alex Vinokur This message and the information contained herein is proprietary and confidential and subject to the Amdocs policy statement, you may review at http://www.amdocs.com/email_disclaimer.asp

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serialization binary file backwards compatibility issue 1.42 -> 1.45
by Jake Brownson 23 Jan '11

23 Jan '11

I see in the changelog (http://www.boost.org/doc/libs/1_45_0/libs/serialization/doc/release.html) that files serialized with 1.42's binary serialization will have problems opening in 1.45. This is exactly what I'm experiencing. Luckily we have only used 1.42 in our project up to this point when we are testing for a release including boost 1.45, so we know all of our previous files were saved using 1.42. We should be able to automatically apply the fix_six fix when loading old files (I can tell by the filename when it's an old one). However I'm confused because fix_six bumps the version from 6 to 7, but in my copy of boost 1.42 serialization is already saving files w/ a library version of 7. Did 1.42 get patched to fix this issue already, or am I misunderstanding something? I found a recent thread where Robert Ramey asked someone to try trunk. I just did this and without the fix_six fix the files seem to be loading properly. Thanks, Jake

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[Fusion] Building parameter list for fusion::invoke
by Vivek 23 Jan '11

23 Jan '11

I am building a library in which users pass in function pointers of any type. I would like the library to determine the function's signature (using function_types), build a fusion vector for the function's arguments, populate the vector with data from a particular source, and then invoke the function using fusion::invoke. The kicker is that the argument types may not be default constructible. Therefore I need a way of initializing a fusion vector from a source as it is being created. For example, the following won't work namespace ft = ::boost::function_types; namespace bf = ::boost::fusion; struct non_def_type { private: non_def_type(); }; void my_func(non_def_type); template <typename FPTR> void my_invoker(FPTR f) { typedef typename ft::parameter_types<FPTR>::type parameter_types; typedef typename bf::result_of::as_vector<parameter_types>::type parameter_vector; parameter_vector params; // error if FPTR contains a parameter_type that is not default-constructible // // ... do something to populate params from data source // bf::invoke(f, params); } int main() { my_invoker(my_func); } Any idea how I might initialize the fusion vector as it is being created? I feel like there might be a way to transform parameter_types into a version in which each type is wrapped in a default-constructible wrapper, then transform that list into the final boost fusion list while at the same time populating it with data, but I can't seem to get the functors to work. E.g.: template <typename T> struct type_wrapper { type_wrapper() {} }; template <typename T> struct wrap { typedef type_wrapper<T> type; }; // Metafunction to unwrap types, and function to populate data // (data should never need to be default-constructible) struct fill { template <typename SIG> struct result; template <typename T> struct result<fill(const type_wrapper<T>&)> { typedef T type; }; // Reference type needed for bf::transform_view template <typename T> struct result<fill(type_wrapper<T>&)> { typedef T type; }; // Non-reference type needed for bf::vector template <typename T> struct result<fill(type_wrapper<T>)> { typedef T type; }; template <typename T> T operator()(const type_wrapper<T>&) const {return data_source<T>().pop();} }; template <typename FPTR> void my_invoker(FPTR f) { typedef typename ft::parameter_types<FPTR>::type parameter_types; // Conversion 1: create a fusion vector with types wrapped in a // default-constructible wrapper typedef mpl::transform<parameter_types, wrap<mpl::_1>, mpl::back_inserter<mpl::vector<> > >::type wrapped_parameter_types; typedef typename bf::result_of::as_vector<wrapped_parameter_types>::type wrapped_parameter_vector; // Conversion 2: create a fusion vector with the unwrapped types // that is also populated with the data from the data_source // (without having to ever default_construct any of the parameter_types) typedef typename bf::result_of::transform<const wrapped_params, fill>::type params_view; typedef typename bf::result_of::as_vector<const params_view>::type params_t; // Finally: invoke the function with arguments bf::invoke(f, bf::as_vector(bf::transform(params_view(), fill()))); } I can't seem to get the meta-function calls or the 'fill' metafunction itself quite right, instead getting vast reams of compiler complaints. Am I missing something? Or alternatively, is there a direct way to initialize a fusion vector? Many thanks, Vivek

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[boost.thread] function call and functor in thread creation: performance
by Boost lzw 22 Jan '11

22 Jan '11

Hi, everyone, A new thread can be created using boost thread either from a function or a functor as the entry point of the new thread, as: void thread_function(); boost::thread thrd(&function); class functor { public: inline void operator()(); }; functor f; boost::thread thrd(f); Is there a performance difference between these two? In an ordinary C++ program, can I claim that calling f() 1000 times gives better performance than calling thread_function() 1000 times, because the functor is hinted "inline" even the hint is igored by my compiler? Is f() the same as a function call in term of performance? Thanks in advance. Robert

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boost.iterators - iterator_facade issue with aligned types.
by Christoph Heindl 21 Jan '11

21 Jan '11

Hi, It seems to me that boost::iterator_facade cannot cope with aligned types when the 'Reference = use_default' template argument is not a reference, which can happen if transform_iterator is used to return the result of a temporay calculation (by value of course). Inside iterator_facade.hpp struct operator_arrow_result { //... static type make(Reference x) { return implicit_cast<type>(&x); } }; Reference here is passed by value. Since Reference has alignment the compiler reports an error. The issue was resolved once i changed that code to struct operator_arrow_result { //... typedef typename mpl::if_< is_reference<Reference> , Reference , typename add_reference<Reference>::type >::type input_type; static type make(input_type x) { return implicit_cast<type>(&x); } }; I wonder about any side effects this would cause? My lousy research is based boost 1.43. That part of the code seems to be unchanged for the current trunk. Best regards, Christoph

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Re: [Boost-users] Assertion `__null != bpos' failed in /inclu de/boost/archive/detail/oserializer.hpp:436
by ktomaszewski＠zunit.com 21 Jan '11

21 Jan '11

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Re: [Boost-users] Assertion `__null != bpos' failed in /inclu de/boost/archive/detail/oserializer.hpp:436
by ktomaszewski＠zunit.com 21 Jan '11

21 Jan '11

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Re: [Boost-users] Assertion `__null != bpos' failed in /inclu de/boost/archive/detail/oserializer.hpp:436
by ktomaszewski＠zunit.com 21 Jan '11

21 Jan '11

1 0

Assertion `__null != bpos' failed in /inclu de/boost/archive/detail/oserializer.hpp:436
by ktomaszewski＠zunit.com 20 Jan '11

20 Jan '11

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Thread-specific pointers versus MFC (Microsoft)
by Stephen Nuchia 20 Jan '11

20 Jan '11

I see a thread about this issue from 2009, with no resolution. A possible patch was mentioned but there was never a followup. We picked up the thread-specific pointer goodness with 1.35, under Visual Studio 2008. We stayed with that combination ever since, for stability. Now I'm looking at VS2010 and 1.44. To support Microsoft's thread model in DLL (dynamically linked libraries) in 1.35 required the user to intercept library unload events. Shortly after 1.35, the boost thread library was enhanced to take care of this for you. The hook it uses, however, conflicts with the use of that same hook by Microsoft's MFC library, when you are building an "MFC Extension DLL" specifically. We have a bunch of that going on. The conflict ends up being detected at link time, like this: 1>libboost_thread-vc100-mt-gd-1_44.lib(tss_pe.obj) : error LNK2005: _pRawDllMain already defined in Table.obj The archive discussion http://thread.gmane.org/gmane.comp.lib.boost.user/46509/focus=46706 What is the current thinking on this issue? I don't see any #ifdef logic in the boost headers that looks like it might be intended to address this, do I need to hack it myself or is there an established work-around? And don't dog me about MFC. Some of the code I'm dealing with is still in FORTRAN, and some is 25-year-old C. Thanks! -swn

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[BGL] Threshold for betweenness_centrality_clustering()
by Cedric Laczny 20 Jan '11

20 Jan '11

Hi, I would like to use boost::betweenness_centrality_clustering() to search a graph for specific clusters. The documentation talks about a "Done" object, which I assume is a functor, similar to the predicates used in filtered_graph(). So in order to decide whether the algorithm should stop the clustering, it probably needs a threshold to decide if it should further iterate and remove edges to decompose the graph. My questions now are: - Does someone perhaps have an example for the usage of this algorithm? I only found documentation on "betweenness.centrality.clustering {RBGL}" for Gnu R, which doesn't bring me very far. - Is there some sort of rule-of-thumb to start with for finding this termination threshold or if there is some more-or-less methodical way of finding out a reasonable threshold? Best, Cedric

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regex __sync_fetch_and_add_4 issue when compiling to 32 bit Linux
by Ákos Maróy 20 Jan '11

20 Jan '11

Hi, I seem to have a problem when trying to link C++ code that refers to the boost regex library, when this is done so that it is compiled on a 64 bit Linux system, but for a 32 bit target. I get the following error: libboost_regex.so: undefined reference to `__sync_fetch_and_add_4' collect2: ld returned 1 exit status I wonder what needs to be done to fix this. steps to reproduce: - compile boost for 32 bit, by: ./bjam architecture=x86 address-model=32 --prefix=/path/to/boost install - try to compile & link a very simple sample code (see the end of the mail) g++ -m32 -L//path/to/boost/lib -I/path/to/boost/include -lboost_regex -o hello hello.cxx /path/to/boost/lib/libboost_regex.so: undefined reference to `__sync_fetch_and_add_4' collect2: ld returned 1 exit status when compiling the same code for 64 bit, it compiles fine. seeing this thread: http://lists.boost.org/Archives/boost/2008/04/135586.php I also tried the following: g++ -m32 -DBOOST_SP_USE_PTHREADS -L//path/to/boost/lib -I/path/to/boost/include -lboost_regex -o hello hello.cxx g++ -m32 -DBOOST_SP_DISABLE_THREADS -L//path/to/boost/lib -I/path/to/boost/include -lboost_regex -o hello hello.cxx but I got the same results :( any help would be appreciated. Akos details: platfrom: Ubuntu 10.10 64 bit compiler: g++ 4.4.4 boost: 1.45.0 the sample code I used is very minimalistic: #include <boost/regex.hpp> int main(void) { boost::regex LF("\\\\n"), CR("\\\\r"), TAB("\\\\t"); return 0; }

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[polygon] Quadratic performance when handling any angle polygons
by Josh Pieper 19 Jan '11

19 Jan '11

Hello, First: we are using boost 1.45.0 with gcc -O3 on Ubuntu 10.04. (Although similar problems appear with VS2008 on Windows 7). We have been observing performance with boost::polygon that is significantly worse than we were expecting when working with any angle polygons. Namely quadratic instead of the expected O(n log n). While profiling, I noticed that most of the time is spent in the overload of line_intersection::validate_scan at detail/scan_arbitrary.hpp:154 which is commented as: "//quadratic algorithm to do same work as optimal scan for cross checking". I have inlined our test program below, and some performance results measured by instruction count under "valgrind --tool=callgrind". Is this poor performance because our data is degenerate, or because a vestigal quadratic double check is still being applied? Regards, Josh Pieper Performance results for n=10..110 measured in instructions to complete the following test program: 10 2363923 20 4427849 30 8695564 40 15642559 50 25530188 60 39081335 70 57151093 80 79278939 90 107261217 100 140674559 110 164340087 -------------------------- #include <boost/lexical_cast.hpp> #include <boost/type.hpp> #include <boost/polygon/polygon.hpp> #include <boost/polygon/gmp_override.hpp> int main(int argc, char** argv) { typedef boost::polygon::point_data<int32_t> point_type; typedef boost::polygon::polygon_set_data<int32_t> polygon_set; typedef polygon_set::value_type value_type; int32_t sample_data[] = { -15417, -53418, 0, 0, -1, -15417, -53418, 37998, -68834, 1, 37998, -68834, 53415, -15416, 1, 0, 0, 53415, -15416, -1, -20188, -37532, 15869, 4788, -1, -20188, -37532, 22129, -73587, 1, 22129, -73587, 58187, -31268, 1, 15869, 4788, 58187, -31268, -1, -12388, -58060, -4666, -3001, -1, -12388, -58060, 42669, -65781, 1, 42669, -65781, 50390, -10722, 1, -4666, -3001, 50390, -10722, -1, -16452, -51370, 2015, 1078, -1, -16452, -51370, 35988, -69834, 1, 35988, -69834, 54455, -17386, 1, 2015, 1078, 54455, -17386, -1, -9812, -61108, -7737, -5548, -1, -9812, -61108, 45744, -63182, 1, 45744, -63182, 47819, -7623, 1, -7737, -5548, 47819, -7623, -1, -19695, -27418, 25940, 4341, -1, -19695, -27418, 12063, -73050, 1, 12063, -73050, 57697, -41291, 1, 25940, 4341, 57697, -41291, -1, -11871, -58680, -5330, -3460, -1, -11871, -58680, 43338, -65220, 1, 43338, -65220, 49879, -10000, 1, -5330, -3460, 49879, -10000, -1, -12303, -10547, -4768, -65638, 1, -4768, -65638, 50314, -58104, 1, 42779, -3013, 50314, -58104, -1, -12303, -10547, 42779, -3013, -1, -10105, -60739, -7415, -5202, -1, -10105, -60739, 45425, -63428, 1, 45425, -63428, 48115, -7891, 1, -7415, -5202, 48115, -7891, -1, -9937, -60912, -7600, -5360, -1, -9937, -60912, 45609, -63249, 1, 45609, -63249, 47946, -7697, 1, -7600, -5360, 47946, -7697, -1, -20348, -32184, 16794, -73555, 1, 16794, -73555, 58164, -36414, 1, 21022, 4957, 58164, -36414, -1, -20348, -32184, 21022, 4957, -1, -10796, -8606, -6653, -64049, 1, -6653, -64049, 48788, -59906, 1, 44644, -4463, 48788, -59906, -1, -10796, -8606, 44644, -4463, -1, -16263, -16858, 1613, -69511, 1, 1613, -69511, 54257, -51638, 1, 36381, 1014, 54257, -51638, -1, -16263, -16858, 36381, 1014, -1, -20298, -33057, 17817, -73534, 1, 17817, -73534, 58292, -35421, 1, 20177, 5056, 58292, -35421, -1, -20298, -33057, 20177, 5056, -1, -11941, -9961, -5271, -65159, 1, -5271, -65159, 49923, -58490, 1, 43253, -3292, 49923, -58490, -1, -11941, -9961, 43253, -3292, -1, -19046, -44168, 28939, -72250, 1, 28939, -72250, 57020, -24267, 1, 9035, 3815, 57020, -24267, -1, -19046, -44168, 9035, 3815, -1, -10926, -8703, -6528, -64127, 1, -6528, -64127, 48893, -59729, 1, 44495, -4305, 48893, -59729, -1, -10926, -8703, 44495, -4305, -1, -19113, -43924, 28699, -72304, 1, 28699, -72304, 57076, -24496, 1, 9263, 3883, 57076, -24496, -1, -19113, -43924, 9263, 3883, -1, -18256, -21581, 6351, -71437, 1, 6351, -71437, 56204, -46832, 1, 31598, 3024, 56204, -46832, -1, -18256, -21581, 31598, 3024, -1, -20282, -31991, 16756, -73456, 1, 16756, -73456, 58219, -36421, 1, 21181, 5045, 58219, -36421, -1, -20282, -31991, 21181, 5045, -1, -19379, -25528, 10293, -72546, 1, 10293, -72546, 57309, -42875, 1, 27637, 4143, 57309, -42875, -1, -19379, -25528, 27637, 4143, -1, -16209, -16633, 1396, -69371, 1, 1396, -69371, 54130, -51767, 1, 36526, 970, 54130, -51767, -1, -16209, -16633, 36526, 970, -1, -18570, -22483, 7245, -71726, 1, 7245, -71726, 56484, -45912, 1, 30669, 3330, 56484, -45912, -1, -18570, -22483, 30669, 3330, -1, -19900, -40189, 24948, -73049, 1, 24948, -73049, 57806, -28203, 1, 12958, 4657, 57806, -28203, -1, -19900, -40189, 12958, 4657, -1, -20322, -36011, 20774, -73460, 1, 20774, -73460, 58220, -32367, 1, 17124, 5082, 58220, -32367, -1, -20322, -36011, 17124, 5082, -1, -555, -68328, 53079, -53671, 1, 38424, -43, 53079, -53671, -1, -15210, -14699, 38424, -43, -1, -15210, -14699, -555, -68328, 1, 21671, -61840, 21718, -61835, 1, 14689, -61655, 21718, -61835, -1, 14689, -61655, 42185, -65881, 1, 42185, -65881, 50629, -10931, 1, 23134, -6705, 50629, -10931, -1, 16104, -6524, 23134, -6705, -1, 16057, -6529, 16104, -6524, -1, 16057, -6529, 21671, -61840, 1, -7903, -63005, 47680, -60927, 1, 45602, -5370, 47680, -60927, -1, -9981, -7449, 45602, -5370, -1, -9981, -7449, -7903, -63005, 1, }; value_type edge_list; size_t num_elements = sizeof(sample_data) / (sizeof(*sample_data) * 5); if (argc > 1) { num_elements = std::min(num_elements, boost::lexical_cast<size_t>(argv[1])); } for (size_t i = 0; i < num_elements; i++) { value_type::value_type edge_plus; int32_t* record = &sample_data[i * 5]; edge_plus.first.first = point_type(record[0], record[1]); edge_plus.first.second = point_type(record[2], record[3]); edge_plus.second = record[4]; edge_list.push_back(edge_plus); } polygon_set pset; pset.set(edge_list); pset.clean(); }

2 2

Re: [Boost-users] [boost] Distributed Development Process (was Re: Development Practices (Proposal Progress))
by Dean Michael Berris 19 Jan '11

19 Jan '11

Update: There is more information on the Wiki page now, pertaining to a few more definitions and the beginnings of the process discussion. Please see: https://svn.boost.org/trac/boost/wiki/DistributedDevelopmentProcess You may have to refresh the page to get the latest version. Basically, the changes there now include: - Definition for the role of a Review Manager - Definition for the role of a Review Manager Assistant (lifted from Joachim's suggestion) - Definition for the "Boost Community" - The definition of a lower barrier to entry style Acceptance Review process - The hint of a Maintenance Review process Feedback on the contents -- both old and new -- would be most appreciated. Thanks in advance and I hope to hear from the community soon! -- Dean Michael Berris about.me/deanberris

1 0

Boost.Pool - Are you using this library, please can we have your input?
by Paul A. Bristow 19 Jan '11

19 Jan '11

Boost.Pool is the subject of a 'make-over' by Boost.Guild. (This is some of a test-bed for a process of revision of older, perhaps orphaned, libraries using the relative safety of the sandbox). In order to permit any modification, the original (hand-written?) html documentation has been converted to Quickbook (and somewhat revised) at http://svn.boost.org/svn/boost/sandbox/guild/pool/libs/pool/doc/ You can build the html docs using the jamfile.v2 in the normal way, but you will probably find it more convenient to go direct to the pdf version http://svn.boost.org/svn/boost/sandbox/guild/pool/libs/pool/doc/pool.pdf This is fairly fully hyperlinked, and includes a reference section using Doxygen. Doxygen comments have been added to the header files (from the original html docs). (If you are a Doxygen fan, there is also a Doxyfile for generating Doxygen-style docs in the /doc/Doxygen/ folder). We are now considering some better tests, and perhaps some enhancements to the code. We'd like input from users about: 1 Things missing or wrong from the docs. More up to date references? 2 Things missing (or don't work well) from Pool. 3 New things that you would like (this is not a promise!). 4 Examples of your use. Perhaps you built some during your development that could be used? 5 Better tests. Thanks. Paul PS Don't panic - the release version will not be changed without a mini-review. --- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow(a)hetp.u-net.com

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Time Series lib
by Peter Godino 19 Jan '11

19 Jan '11

I've found there is a boost lib called Time Series. It is not yet in SVN. Is it possible access this library? Thanks, Peter

2 2

Having program_options generate a round-trippable config file?
by Rhys Ulerich 19 Jan '11

19 Jan '11

Hi all, I'm using program_options to combine arguments from the command line, the environment, and one or more input files. As you'd expect, it works very well. However, I have an additional requirement that I'm unsure how to implement cleanly atop the library: Given instances of program_options::options_description and program_options::variables_map, I'd like to save a program_options::parse_config_file-friendly file containing the final values obtained. Such a config file could be given back to the program and would identically reproduce the options used. The need is for some scientific software where I want a precise record of what a user has chosen for reasons of scientific repeatability. I see several ways to go about achieving this need, but all of them are ugly, brittle hacks: 1) Accessing the information directly from variables_map seems difficult due to variables_map's use of type erasure and the fact that it does not save the tokens from which values are derived. 2) Obtaining the tokens from the intermediate program_options::parsed_options instances is a possibility but requires me to effectively reimplement the logic contained within program_options::store. It also fails to account for defaulted values. 3) Looping over each program_options::value_semantic found in the options_description instance and adding a notify() callback again runs into type erasure troubles. 4) Adding a notify() to each option_description at its point of declaration avoids type erasure but makes the code impact O(n) where n is the number of options. Has anyone built such a feature atop program_options? Can anyone lend some wisdom? Thanks, Rhys

2 1

boost.type_traits - is_convertible issue with aligned types
by Christoph Heindl 19 Jan '11

19 Jan '11

Hi, consider the following simple example struct aligned_type { __declspec(align(16)) float vals[4]; }; BOOST_STATIC_ASSERT((boost::is_convertible<aligned_type , aligned_type >::value)); It fails on MSVC 9.0 with boost 1.43 with the following error type_traits/is_convertible.hpp(254) : error C2719: 'unnamed-parameter': formal parameter with __declspec(align('16')) won't be aligned References won't help either BOOST_STATIC_ASSERT((boost::is_convertible<aligned_type &, aligned_type &>::value)); as it breaks with a similar error type_traits/is_convertible.hpp(263) : error C2718: 'const vec_aligned': actual parameter with __declspec(align('16')) won't be aligned A bug database search did not bring up any relevant matches, so I wonder if that is a new issue or just by design? Best regards, Christoph

2 7

[Proto] Returns double
by Hossein Haeri 18 Jan '11

18 Jan '11

Dear all, I am working in an application where I use Proto to evaluate an expression template like _1 >> f >> g to g(f(x)) once x is assigned to _1. (Please note that f and g are not necessarily functions -- they might be function objects too.) I am interested in putting a compile-time sanity check to ensure that the functions/function objects f and g do indeed return a double (or something convertible to it). For that, I wrote the following grammar which GCC 4.5.1 (Boost 1.42, MinGW32, WinXP, SP3) doesn't like, with the error messages being at the P.S. section: struct EmtnRet2DblChk: or_ < terminal<_>, and_ < shift_right<EmtnRet2DblChk, terminal<_> >, if_ < typename boost::is_convertible < typename boost::result_of<(_value(_right))(double)>::type, double >::type > > > {}; (The above code starts in my line 81 and ends in my line 98.) Any idea please? TIA,--Hossein P.S. Compiling: main.cpp main.cpp:98:2: error: a cast to a type other than an integral or enumeration type cannot appear in a constant-expression main.cpp:98:2: error: template argument 1 is invalid main.cpp:92:22: error: wrong number of template arguments (1, should be 2) /boost/type_traits/is_convertible.hpp:418:1: error: provided for 'template<class From, class To> struct boost::is_convertible' main.cpp:90:21: error: template argument 1 is invalid main.cpp:88:4: error: template argument 2 is invalid 85:3: error: template argument 2 is invalid main.cpp:98:3: error: expected '{' before ';' token

1 0

[asio] io_service hang on stop
by Daniele Barzotti 18 Jan '11

18 Jan '11

Hi, I designed a library to start a io_service background thread when the first object is created (these objects use serial_port) and to terminate it when the last object is destroyed. This is the io_worker_thread: void io_worker_thread(void) { io_service.reset(); io_service.run(); p_work.reset(); io_service.stop(); thread_started = false; }; All seems to work, when the last object is destroyed the io_service.run() returns...but the calling application hang! I noted that the win_thread::join() (in win_thread.ipp) is still running and waiting on "::WaitForSingleObject(thread_, INFINITE);" Follow I post the threads and the call stack when the application is ended: ----------------------------------------------- Main Thread Main Thread boost::asio::detail::win_thread::join Worker Thread _threadstartex `io_worker_thread'::`2'::com_init::~com_init Worker Thread _threadstartex _endthreadex Worker Thread _TppWaiterpThread@4 _ZwWaitForMultipleObjects@20 Worker Thread _TppWorkerThread@4 _NtWaitForWorkViaWorkerFactory@8 Worker Thread _TppWorkerThread@4 _NtWaitForWorkViaWorkerFactory@8 RPC Thread RPC Callback Thread _NtDelayExecution@8 Worker Thread _TppWorkerThread@4 _ZwWaitForSingleObject@12 ----------------------------------------------- ntdll.dll!_ZwWaitForSingleObject@12() ntdll.dll!_ZwWaitForSingleObject@12() kernel32.dll!_WaitForSingleObjectExImplementation@12() kernel32.dll!_WaitForSingleObject@8() AxEuroATLib_debug.dll!boost::asio::detail::win_thread::join() AxEuroATLib_debug.dll!boost::asio::detail::win_iocp_io_service::shutdown_service() AxEuroATLib_debug.dll!boost::asio::detail::service_registry::~service_registry() AxEuroATLib_debug.dll!boost::asio::detail::service_registry::`scalar deleting destructor'() AxEuroATLib_debug.dll!boost::asio::io_service::~io_service() AxEuroATLib_debug.dll!`dynamic atexit destructor for 'io_service''() AxEuroATLib_debug.dll!_CRT_INIT(void * hDllHandle=0x5b880000, unsigned long dwReason=0, void * lpreserved=0x00000000) AxEuroATLib_debug.dll!__DllMainCRTStartup(void * hDllHandle=0x5b880000, unsigned long dwReason=0, void * lpreserved=0x00000000) AxEuroATLib_debug.dll!_DllMainCRTStartup(void * hDllHandle=0x5b880000, unsigned long dwReason=0, void * lpreserved=0x00000000) ntdll.dll!_LdrpCallInitRoutine@16() ntdll.dll!_LdrpUnloadDll@8() ntdll.dll!_LdrUnloadDll@4() KernelBase.dll!_FreeLibrary@4() ole32.dll!77229562() [Frames below may be incorrect and/or missing, no symbols loaded for ole32.dll] ole32.dll!77229593() ole32.dll!772295a7() ole32.dll!772298bf() ole32.dll!77229805() ole32.dll!77229a8c() msvbvm60.dll!7294b681() msvbvm60.dll!72946299() msvbvm60.dll!7294613e() user32.dll!_InternalCallWinProc@20() + 0x23 bytes user32.dll!_UserCallWinProcCheckWow@32() + 0xb7 bytes user32.dll!_SendMessageWorker@24() + 0x112 bytes user32.dll!_SendMessageA@16() + 0x4c bytes msvbvm60.dll!7294b5f6() msvbvm60.dll!7294a9cf() user32.dll!_NtUserPeekMessage@20() + 0x15 bytes msvbvm60.dll!7294a95c() msvbvm60.dll!7294a8e2() msvbvm60.dll!7294a6cf() msvbvm60.dll!7294a63f() msvbvm60.dll!7294a5e1() msvbvm60.dll!7294a51d() msvbvm60.dll!7294a4e8() msvbvm60.dll!72943644() EuroATLibTest.exe!___vbaS() + 0xa bytes BASIC ntdll.dll!___RtlUserThreadStart@8() + 0x27 bytes ntdll.dll!__RtlUserThreadStart@8() + 0x1b bytes How can I solve? Regards, Daniele.

1 0

[asio] Problem implementing a line-based protocol
by Hannes Brandstätter-Müller 18 Jan '11

18 Jan '11

I am trying to write a server and client that use a line-based text protocol for communication. It works rather well now, but there is some weird problem: One of my messages loses the first 4 characters. (reproducible, but I don't do anything special in that one case, I think) boost::asio::async_read_until is used to read the line into a boost::asio::streambuf the socket is a boost::asio::local::stream_ protocol::socket std::string msg; std::istream is(&buffer); std::getline(is, msg); I looked at the buffer.size(), the size reported to the handler function and compared it to the length of the message, which looks consistant, so I don't assume that the read call read some characters over the \n. (but that would be the only logical explanation) * there are no multiple read operations on the socket * I reuse the same buffer for multiple async_read_until calls Does anyone have a code snippet that can help me figure out what could be stuck and lost in the buffer, or where else the problem could be?

2 7

issue when using boost::tokensizer with std::wstring.
by Sean Farrow 18 Jan '11

18 Jan '11

Hi: I'm trying to use boost::tokenizer and have included boost/tokenizer.hpp. I get the errors below when trying to compile the following code: std::wstring TokensStr(Item); boost::tokenizer<> Tokens(TokensStr); Item, is defined as a BSTR. the errors are: 1>c:\program files\boost\boost\tokenizer.hpp(59): error C2664: 'std::_String_const_iterator<_Elem,_Traits,_Alloc>::_String_const_iterator(const std::_String_const_iterator<_Elem,_Traits,_Alloc> &)' : cannot convert parameter 1 from 'std::_String_const_iterator<_Elem,_Traits,_Alloc>' to 'const std::_String_const_iterator<_Elem,_Traits,_Alloc> &' with [ _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char> ] and [ _Elem=wchar_t, _Traits=std::char_traits<wchar_t>, _Alloc=std::allocator<wchar_t> ] and [ _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char> ] Reason: cannot convert from 'std::_String_const_iterator<_Elem,_Traits,_Alloc>' to 'const std::_String_const_iterator<_Elem,_Traits,_Alloc>' with [ _Elem=wchar_t, _Traits=std::char_traits<wchar_t>, _Alloc=std::allocator<wchar_t> ] and [ _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char> ] No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called d:\work\access for everyone\sibelius access\sibeliusaccessserver\sibeliusaccess.cpp(231) : see reference to function template instantiation 'boost::tokenizer<>::tokenizer<std::wstring>(const Container &)' being compiled with [ Container=std::wstring ] 1>c:\program files\boost\boost\tokenizer.hpp(59): error C2664: 'std::_String_const_iterator<_Elem,_Traits,_Alloc>::_String_const_iterator(const std::_String_const_iterator<_Elem,_Traits,_Alloc> &)' : cannot convert parameter 1 from 'std::_String_const_iterator<_Elem,_Traits,_Alloc>' to 'const std::_String_const_iterator<_Elem,_Traits,_Alloc> &' with [ _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char> ] and [ _Elem=wchar_t, _Traits=std::char_traits<wchar_t>, _Alloc=std::allocator<wchar_t> ] and [ _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char> ] Reason: cannot convert from 'std::_String_const_iterator<_Elem,_Traits,_Alloc>' to 'const std::_String_const_iterator<_Elem,_Traits,_Alloc>' with [ _Elem=wchar_t, _Traits=std::char_traits<wchar_t>, _Alloc=std::allocator<wchar_t> ] and [ _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char> ] No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called Does anyone know how I can solve these errors. Any help appreciated. Regards Sean.

2 3

[boost::python] iterator from member container
by Ralf Goertz 18 Jan '11

18 Jan '11

Is ist possible to have a class that has a map as member like struct Foo { std::map<string,int> bar; }; and then something like class_<Foo>("Foo") .def("__iter__", iterator<std::map<string,int>()); so that in python an object foo of type Foo can be used like this for i in foo: <do something with the bar iterator i> ? Ralf

2 1

Spirit : Is possible to build rule step by step?
by Andrea Fontana 17 Jan '11

17 Jan '11

I'm trying to write a small example using spirit. I can write a rule in this way: my_rule = lit("example") | lit("example2"); Also in this way: std::string ex("example") std::string ex2("example2"); my_rule = lit(ex) | lit(ex2)) Is there a way to do this: std::string ex("example") std::string ex2("example2"); my_rule = lit(ex); my_rule = my_rule | lit(ex2)); I need to append strings from an array... Maybe I miss something from docs.

3 2

[Lambda] result_of support bug for placeholders?
by Michel MORIN 17 Jan '11

17 Jan '11

Hi, Let's we have using boost::lambda::_1; typedef boost::remove_reference<decltype(_1)>::type _1_type; Then, decltype(_1(1)) (and std::result_of<_1_type(int)>::type) is 'int const&', but boost::tr1_result_of<_1_type(int)>::type is 'int&". Is this a bug? Regards, Michel

1 0

Customize Message Queue
by derleader mail 16 Jan '11

16 Jan '11

Hi, I need advice how to customize Message Queue in boost / interprocess / ipc / message_queue . hpp > I need to insert additional argument in mq . send (& number , sizeof ( i ), 0 , ); and here mq . receive (& number , sizeof ( number ), recvd_size , priority, ); Its something like 2 messages in one queue. How I can do this? Regards Peter

2 1

Re: [Boost-users] functors created by boost::bind and move semantic
by Marat Abrarov 16 Jan '11

16 Jan '11

To: michi7x7 > > Marat Abrarov: > > Does anybody know why functional objects created by means of > > boost::bind have no move constructors. It would be rather useful > > especially when such functional objects consist of some smart pointers > > (like boost::shared_ptr). > > For example, move constructor of boost::shared_ptr is very light > > (comparing to its copy constructor) - it doesn't use any CAS at all. > > May be someone know the reason of move constructor absence or maybe > > someone know any plans of implementing it. > michi7x7: > I wondered about that too. The reason might be the huge ammounts of code > that need to be changed within boost::function. > However, I'm sure it will come soon. I mean not boost::function but functors created by boost::bind (boost::bind_t....) - they are rather simple - like tuples, so, I think, their move constructors would be simple too. But it would be great to have move constructors in boost::function too (which is more difficult because of current boost::function implementation). Interesting, what is about std::function (or std::tr1::function) in STL implementations with C++0x support, for example, in STL shipped with MS Visual C++ 2010. Marat Abrarov.

1 0

TTI library in the Boost sandbox
by Edward Diener 16 Jan '11

16 Jan '11

I have uploaded to the Boost sandbox 'tti' directory version 1.0 of the TTI library. The TTI library, which is an abbreviation for the Type Traits Introspection library, allows a programmer to introspect at compile time the inner elements of a C++ type. The introspection process depends on specifying the name of the inner element by different macros for different types of elements, and then using a generated metafunction to determine whether that element exists within the enclosing type. The inner elements which can be introspected are type, class template, member data, member function, static member data, and static member function. The TTI library is based on the type_traits_ext portion of the Concept Traits Library, with improvements and additions, and also lifts functionality, for the purposes of orthogonality, from Boost.MPL regarding introspection of types and templates. The purpose of the library is to provide a consistent set of interfaces for doing compile-time introspection which other template metaprogrammers can use in their code. There is a readme.txt in the top-level sandbox tti directory, for anyone browsing the sandbox for interesting libraries, which replicates what is written here. There is a build.txt file in the doc subdirectory for building the documentation and running the tests. The documentation is also included as part of the sandbox files for those who can not build the docs. There is a list of todo items in the sandbox on which I will be working for the next release, but the library is already feature rich. The library has been tested and works with gcc 4.30, 4.4.0, 4.5.0-1, 4.5.2, and VC++ 8.0, 9.0, and 10.0. It may also work with other compilers. There is a bug in versions of gcc prior to version 4 for which I will attempt to find a workaround if it is deemed important, which prevents it from working with the library. Questions, comments, suggestions, and bug reports are all welcome.

1 0

[Proto] Difficult Arity Check
by Hossein Haeri 16 Jan '11

16 Jan '11

Dear all, I have a syntax like ((_1 >> &f1 >> &f2) || (_2 >> &f3) || (_3 >> &f4 >> &f5 >> &f6)) >> g for which I already have a small grammar which along with my context do their job fine. The above expression is to act like g(f2(f1(x)), f3(y), f6(f5(f4(z)))) once invoked with _1 == x, _2 == y, and _3 == z. I am currently trying to add a safety layer on top of that which can emit a compile-error -- at the appropriate corner of my code -- that can prevent pass of functions with wrong arities. For example, g above needs to be a ternary. Although my context will notice it if g is not a ternary and produce a meaningful error message, that's too late. My poor user needs to be informed right at the instantiation time. So, I thought I'm going to use transforms to get my grammar manage that. To that end, I thought the _state of my grammar needs to be an MPL pair of an mpl::int_ and an mpl::bool_. Below is my algorithm with some plain English explanation. Please would someone help me for I found it utterly formulate that in Proto. 1) when<terminal<_>, mpl::pair<mpl::int_<1>, mpl::true_> > -- so far, so easy. 2) When logical_or<Arity, Arity>, return summation of the two arities, paired with the logical and of success value in the two branches: mpl::pair < mpl::plus < typename _state(EmtnArity(_left))::first, typename _state(EmtnArity(_right))::first >, mpl::and_ < typename _state(EmtnArity(_left))::second, typename _state(EmtnArity(_right))::second > > (This doesn't compile.) 3) When shift_right<Arity, Arity>, return mpl::int_<1> again, but, this time, paired with whether or not the right arity has been passed around logically anded with the success value so far: mpl::pair < mpl::int_<1>, mpl::and_ < typename _state(EmtnArity(_left))::second, is_callable_with_args(***) > > And, I'm totally stuck in the use of is_callable_with_args! Any helps please? Feel free to pass a completely new design too. TIA, --Hossein

2 3

Splitting Tiff RGBA into RGB and alpha data ...
by Corinna Kinchin 15 Jan '11

15 Jan '11

Hi there I have an uncompressed RGBA Tiff file (RGB + alpha channel) which I'm trying to split into two data files, one containing the RGB data, and the other containing the alpha (transparency) data. Here's a code snippet showing my (probably misguided) attempt at doing this: image_read_info< tiff_tag > info = read_image_info(in, tiff_tag()); if ( info._photometric_interpretation == 2 && info._samples_per_pixel == 4 ) { // RGBA rgba8_image_t rgba_img; // Read RGBA image ... read_image(in, rgba_img, tiff_tag()); // Set up planar image (to extract alpha channel) and rgb image // (to extract rgb data) rgba8_planar_image_t dst_planar_image(rgba_img.dimensions()); rgb8_image_t dst_rgb_image(rgba_img.dimensions() ); // Convert pixels to appropriate view copy_and_convert_pixels(view(rgba_img), view(dst_rgb_image)); copy_and_convert_pixels(view(rgba_img), view(dst_planar_image)); // Write out data ofstream out((ofilename+"rbg").c_str(), ios_base::binary), alphaout((ofilename +"alpha").c_str(), ios_base::binary); out.write(reinterpret_cast<const char*>(interleaved_view_get_raw_data(view(dst_rgb_image))), info._width * info._height * 3); alphaout.write(reinterpret_cast<const char*>(planar_view_get_raw_data(view(dst_planar_image), 3)), info._width * info._height); ... The alpha transparency data is ok as far as I can see, but the RGB data is mangled ... presumably I've misunderstood how the copy_and_convert_pixels() works. I'm new to the boost::gil library, and am finding the documentation a little hard to get to grips with, so any hints you could give would be greatly appreciated. Thanks a million in advance! All the best, ... Corinna

2 1

functors created by boost::bind and move semantic
by Marat Abrarov 15 Jan '11

15 Jan '11

Hi, Boost Users. Does anybody know why functional objects created by means of boost::bind have no move constructors. It would be rather useful especially when such functional objects consist of some smart pointers (like boost::shared_ptr). For example, move constructor of boost::shared_ptr is very light (comparing to its copy constructor) - it doesn't use any CAS at all. May be someone know the reason of move constructor absence or maybe someone know any plans of implementing it. Abrarov Marat.

2 1

Call C++ function from second Limux daemon
by derleader mail 15 Jan '11

15 Jan '11

Hi, I'm using boost for interprocess communication using message queue. There are 2 Linux daemons which must exchange data. In daemon A I want to call a C++ function from daemon B and pass some arguments for execution. The function in daemon B must execute the arguments and return the result to daemon A. Is it possible to implement this? Regards Peter

1 0

[Function Types] can_be_called
by Hossein Haeri 14 Jan '11

14 Jan '11

Dear all, May I please ask the people in charge of function_type to address: https://svn.boost.org/trac/boost/ticket/3783 I need it in my code and need to know when it's going to become available. TIA, --Hossein

2 1

[Proto] Anything Callable
by Hossein Haeri 14 Jan '11

14 Jan '11

Dear all, How can I have a grammar that matches a terminal of any callable type? Be it a function, function object, or a Boost.Function (specifically). TIA, --Hossein

3 6

[version] boost version check, header (.hpp) vs binaries (libs)
by alfC 14 Jan '11

14 Jan '11

Hi, I work in at least 3 computers (home/work/cluster, in which the cluster is really a shared filesystem between different architectures, etc). Besides that, for some projects I use the default version of boost in that system and in others a locally (user space) installed boost (that is, ranging from boost 1.33 to boost 1.46svn). Therefore is not uncommon that I mess the compilation lines and end up including headers from a certain version an linking to a different one. Hopefully this fails at link time: e.g. undefined reference to `boost::filesystem3::path::extension() const' but it is confusing and potentially it could compile (and then crash unexpectedly) I am aware of 'boost/version.hpp' but this is only for header verification. The question is, is there a Boost mechanism to verify that the header and the library in boost are consistent? (Hopefully at compile/link time) Thank you, Alfredo

2 1

Error '__Unwind_Resume' when trying to link codeblocks to boost::thread
by Bruno Ferraz do Amaral 14 Jan '11

14 Jan '11

Hi, I'm a new user of Boost Libraries, and I'd use multithreading linking the boost::thread class into my projetct. I'm using Code::Blocks, and I've built the Boost in Windows, and then I followed a wiki guide to link the libraries of the Boost.Thread with my Project in CodeBlocks. However I found this reference errors: C:\boost_1_45_0\stage\lib\libboost_thread-mgw45-mt-1_45.a(thread.o):thread.cpp:(.text+0x7d)||undefined reference to `__Unwind_Resume'| C:\boost_1_45_0\stage\lib\libboost_thread-mgw45-mt-1_45.a(thread.o):thread.cpp:(.text+0x66f)||undefined reference to `__Unwind_Resume'| C:\boost_1_45_0\stage\lib\libboost_thread-mgw45-mt-1_45.a(thread.o):thread.cpp:(.text+0x771)||undefined reference to `__Unwind_Resume'| C:\boost_1_45_0\stage\lib\libboost_thread-mgw45-mt-1_45.a(thread.o):thread.cpp:(.text+0xdbe)||undefined reference to `__Unwind_Resume'| C:\boost_1_45_0\stage\lib\libboost_thread-mgw45-mt-1_45.a(thread.o):thread.cpp:(.text+0xe53)||undefined reference to `__Unwind_Resume'| C:\boost_1_45_0\stage\lib\libboost_thread-mgw45-mt-1_45.a(thread.o):thread.cpp:(.eh_frame+0x12)||undefined reference to `___gxx_personality_v0'| ||=== Build finished: 6 errors, 0 warnings ===| What I have to do? I tried a lot of tutorials and guides in Google, but no one works...

4 5

[Serialization][Variant] serialization of variant containing boost::blank
by dariomt＠gmail.com 14 Jan '11

14 Jan '11

Hi, In the following code I show how a boost::variant that has a boost::blank cannot be serialized, and a proposed fix. I argue that this should work out of the box. This is with Boost 1.42.0. Am I doing something wrong here, or is serialization of boost::blank somewhere already? Thanks #include <boost/variant/variant.hpp> #include <boost/serialization/variant.hpp> #include <boost/archive/text_oarchive.hpp> #include <sstream> #ifdef FIX // suggested fix: non-intrusive serialize() for boost::blank namespace boost { namespace serialization { template<class Archive> void serialize(Archive &, boost::blank &, const unsigned int) { // Nothing to do here } } } #endif int main() { boost::variant<int, double> v1 = 666; boost::variant<boost::blank, int, double> v2 = 666; std::ostringstream os; boost::archive::text_oarchive oa(os); // works! oa << v1; // compile error about boost::blank not having a serialize method // #define FIX to compile oa << v2; return 0; }

1 0

ASIO: What is the proper way to upload a LARGE file?
by Ramon F Herrera 13 Jan '11

13 Jan '11

I have successfully been using this code to upload small stuff: try { // open tcp connection tcp::iostream net_stream(strSubmitServer, "12345"); // send file name net_stream << strFile << endl; // copy file char ch; while ((ch = fgetc(f)) != EOF) net_stream << ch; } catch (std::exception& e) { std::cout << "Exception: " << e.what() << std::endl; } Needless to say, the code above is extremely slow/inefficient for bulky transfers. Now I need to upload some large fails, and tried this: tcp::iostream net_stream(SERVER_ADDR, "12345"); // send file name net_stream << IN_FILE << "\n"; // send tags data size net_stream << count << "\n"; // copy tags data net_stream.write((char *)data, count); <<== app crashes here I figured that TCP would break the delivery into packets... TIA, -Ramon

3 2

Implications of using Boost with different versions of Visual Studio in the same computer?
by Ramon F Herrera 13 Jan '11

13 Jan '11

I have installed MSVS-2005 and MSVS-2010 in my development PC. I noticed that contrary to other libraries, every boost installation seems to be specific for: - The Boost version (duh!) - The MSVC Version For instance: libboost_system-vc80-mt-1_43.lib I would prefer to have all the -vc80- and -vc100- library files in the same folder, but perhaps I am looking for trouble? Then there is the issue of the includes. If such strategy turns out to be ill-advised, I would like to somehow "hide" my MSVS-2010 (don't want to uninstall it!) and then install Boost, built bye the VS-2005 toolchain. Thanks for your kind assistance. -RFH ps: Boost rules!! :-)

5 5

Serialization Boost 1.45
by Andrei Popa 13 Jan '11

13 Jan '11

Hi, I was building my project until recently with Boost 1.42. I have upgraded my Boost Version to 1.45. First of all, I see that now by default is used the dynamic linking to the Boost/Serialization. How can I set my code/project to link it statically to the Boost/Serialization? Second, I can not open my old files, I used only binary archives. I read about fix_six, but when I run it with my files I got the message "library version not equal to six"? How is this possible? How can I found out what "library version " do I have? What can I do to fix this problem? Thank you very much in advance! Andrei.

2 1

Boost 1.42 TR1 With GCC 4.5 selects wrong overload
by Abir Basak 13 Jan '11

13 Jan '11

I am using the portable style boost headers for tr1 implementation from Boost 1.42 such as #include <boost/tr1/type_traits.hpp> When i use gcc implementation of tr1 (Mingw GCC 4.5.1 from TDM, BOOST_HAS_GCC_TR1 defined) everything works fine. However when i select boost tr1 implementation (i.e not define the above macro) some stdlib functions such as std::abs gets wrong overloaded selected. For. e.g. in gcc/tr1 std::abs((signed char)5) returns an int while in boost/tr1 it returns a double. A compilable example is like #include <cstdlib> #include <iostream> #include <typeinfo> #include <boost/tr1/type_traits.hpp> int main(){ std::cout<<typeid(std::abs((short)5)).name(); //prints i with gcc/tr1 while prints d with boost/tr1 } it happens with type_traits header (may be few other also) but not with all tr1 headers(such as array). Thank you. abir basak

2 1

Boost 1.45 Serialization : Getting archive exception while loading
by Tejaswin Macharla 13 Jan '11

13 Jan '11

Hi, I have changed the sample code given in the Boost site for Serialization and the saving of the file works fine. The code works fine without the switch case as it executes save and load in the same session. I can save and load in the same session. If I close the application and open the application again and try to load the saved(serialized) file, it is throwing an Archive Exception. I am trying this for a game that I am working on so as to save and load in different sessions. Code: ----------------------------------------------------------------------- #include <fstream> // include headers that implement a archive in simple text format #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> ///////////////////////////////////////////////////////////// // gps coordinate // // illustrates serialization for a simple type // class gps_position { private: friend class boost::serialization::access; // When the class Archive corresponds to an output archive, the // & operator is defined similar to <<. Likewise, when the class Archive // is a type of input archive the & operator is defined similar to >>. template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; } int degrees; int minutes; float seconds; public: gps_position(){}; gps_position(int d, int m, float s) : degrees(d), minutes(m), seconds(s) {} void gps_display() { std::cout << "\n Displaying....\n"; std::cout << degrees << " "<< minutes << " "<< seconds<<std::endl; } }; int main() { // create and open a character archive for output std::ofstream ofs("filename"); // create class instance const gps_position g(35, 59, 24.567f); gps_position newg; char ch; std::cout << "Enter an option\n 1. Save\n 2. Load\n 3. Display\n\n"; std::cin >> ch; switch(ch) { case '1': { // save data to archive boost::archive::text_oarchive oa(ofs); // write class instance to archive oa << g; // archive and stream closed when destructors are called } break; case '2': { // ... some time later restore the class instance to its orginal state // create and open an archive for input std::ifstream ifs("filename", std::ios::binary); boost::archive::text_iarchive ia(ifs); // read class state from archive ia >> newg; // archive and stream closed when destructors are called } break; case '3': newg.gps_display(); break; default: std::cout << "\nInvalid option\n"; } return 0; } ----------------------------------------------------------------------- Can we load a serialized file from the same program in a different session? -- Thanks & Regards ------------------------------ Tejaswin G Macharla -----------------------------

2 2

Portability on XBox, PS3, and iPhone
by Hossein Haeri 12 Jan '11

12 Jan '11

Dear all, 10 years ago, it was crucially important to know whether the Boost stuff one was about to use was compatible with the targeted C++ compiler. The Boost documentation was quite informative on that IIRC. With the recent shifts of the industry, the equivalent and more update information needs to be on portability of each Boost library on the modern platforms. Is there any chance I can get some sort of comparative table on that? As the subject-line suggests, I am specifically interested in XBox, PS3, and iPhone. TIA, --Hossein

4 10

[Proto] Terminal of Whatever is Derived from T
by Hossein Haeri 12 Jan '11

12 Jan '11

Dear all, How can I have a grammar which matches terminals of whatever type derived from T? TIA, --Hossein

2 2

Re: [Boost-users] boost::interprocess boost::interprocess xsi_shared_memory
by Daniel Neuberger 12 Jan '11

12 Jan '11

Is there a reason for not finishing the implementation of XSI (System V) shared memory? It seems like most of the work is already done. If there is no reason not to, I might be able to finish the implementation so that it can be included in the next release. I know that POSIX may be sufficient for some, but System V allows for much better control using SELinux since it lives in kernel space. FYI: This is in response to http://thread.gmane.org/gmane.comp.lib.boost.user/64537. Thoughts? Thanks. - Daniel

4 7

memory leak when using shared_from_this
by jochemspek 12 Jan '11

12 Jan '11

hi there, I'm having trouble understanding the cause of a memory leak apparently caused by using 'shared_from_this'. The following is the case: I have a AbstractProperty class with XMLNode as subclass. there exist two typedefs for these classes, namely typedef shared_ptr< XMLNode > XMLNodePtr and similar for AbstractProperty. in the XMLNode class I have the member function 'addChild' that adds a child to the XMLNode instance. I keep a reference to the parent by calling chid->setParent(), *with a shared pointer to this*. This results in a (quite severe) memory leak. I can resolve the problem by using a shared_ptr with a null-deleter ( see f.e. http://lists.boost.org/boost-users/2008/05/36281.php ), but I don't quite understand *why* the leak occurs, as I understand it so that the shared_from_this is a weak_ptr to this. I would much appreciate any comments. thanks, Jochem //---------------------------begin code----------------------------- const XMLNodePtr XMLNode::addChild( const string name ){ XMLNodePtr child( new XMLNode() ); child->setParent( static_pointer_cast< XMLNode, AbstractProperty >( shared_from_this() ) ); m_children.push_back( child ); return( child ); } //---------------------------end code----------------------------- -- View this message in context: http://boost.2283326.n4.nabble.com/memory-leak-when-using-shared-from-this-… Sent from the Boost - Users mailing list archive at Nabble.com.

1 1

Linking Error on WaitForSingleObject
by Anish Chandak 12 Jan '11

12 Jan '11

Hello All, I have a very unusual linking issue. It might be trivial but I could not find any reference after searching on the mailing list and other forums. I wrote a very simple example code (attached at the end of message) for using boost lock and mutex. The same piece of code compiles fine without linking error in one Visual Studio Project and gives the following linking error in another Visual Studio Project. I have made sure that the VS settings for each project match exactly. ERROR: error LNK2019: unresolved external symbol __imp__WaitForSingleObject__USE_VCR_MODE@8 referenced in function "public: void __thiscall boost::detail::basic_timed_mutex::lock(void)" (?lock@basic_timed_mutex@detail@boost@@QAEXXZ) I am using Visual Studio 2010 and boost 1_45_0. The code is linking to libboost_thread-vc100-mt-s-1_45.lib in both the projects. Any suggestions on what could be the possible cause of this or how to fix this will be highly appreciated. Thanks, Anish boost::mutex active_source_mutex; class TESTCLASS { public: void LOOP(int count) { int tcount = 0; for(int j=0; j<count; j++) { for(int k=0; k<10000000; k++) { tcount++; } printf("%d %d\n",j,tcount); } } void THREAD_CALLBACK() { boost::mutex::scoped_lock slock(active_source_mutex); LOOP(10); } }; int main() { TESTCLASS jk; boost::thread thread_1 = boost::thread(&TESTCLASS::THREAD_CALLBACK, &jk); boost::thread thread_2 = boost::thread(&TESTCLASS::THREAD_CALLBACK, &jk); thread_1.join(); thread_2.join(); return 0; }

3 3

[Proto] Non-const First Argument for Nested eval<>'s operator() ()
by Hossein Haeri 12 Jan '11

12 Jan '11

Dear all, In the Proto documentation, is there any reason why in all the specialisations of eval<Expr> for contexts, the first argument to their operator() is of type Expr& as opposed to const Expr&? TIA, --Hossein

2 2

Boost Graph Library: edge retrieval using edge descriptor between square brackets fails
by Nicholas Mario Wardhana 12 Jan '11

12 Jan '11

Hi all, I am wrapping the Boost Graph Library with a thin class, and I am having a problem in retrieving the edge. I use a mechanism similar to the one in here: http://stackoverflow.com/questions/3100146/adding-custom-vertices-to-a-boos… For testing, I add two vertices (suppose pNode1 and pNode2) successfully, and they can be retrieved as well by passing in their vertex descriptors. However, this is not the case for the edges: when I add an edge from pNode1 to pNode2, the edge is correctly stored as the out_edge of pNode1, but when I retrieve the edge using its edge descriptor, which is the (valid) return value of the add_edge() function, the pointer value is NULL. Also, when I debug the code, I find that inside the graph, there are two variables m_edges and m_vertices. The m_vertices correctly contains two vertex descriptors, but the m_edges is empty. So, do I make a mistake here? I have been looking for some information in Boost's archive and other sources (StackOverflow, ...), but so far haven't found anything helpful. I include a snippet at the end of this e-mail. I am using Visual Studio 2008 SP1 on Windows Vista SP2, and Boost 1.44.0 (haven't upgraded yet to 1.45, but the latter doesn't seem to address this issue). Thank you! Best regards, Nicholas Mario Wardhana //--------------------------- snippet ----------------------------- template <class NodeData, class EdgeData> class BoostGraphWrapper : public Graph<NodeData, EdgeData> { typedef boost::adjacency_list<boost::listS, boost::listS, boost::directedS, Node<NodeData>*, Edge<NodeData, EdgeData>*, boost::listS> BoostGraph; typedef typename boost::graph_traits<BoostGraph>::vertex_descriptor BoostVertexDescriptor; typedef typename boost::graph_traits<BoostGraph>::edge_descriptor BoostEdgeDescriptor; //... public: void AddNode(Node<NodeData>* pNode); Edge<NodeData, EdgeData>* AddEdge(Node<NodeData>* pNode1, Node<NodeData>* pNode2); //... private: BoostGraph m_graph; //... }; template <class NodeData, class EdgeData> void BoostGraphWrapper<NodeData, EdgeData>::AddNode(Node<NodeData>* pNode) { Graph<NodeData, EdgeData>::AddNode(pNode); // 1. Get the descriptor BoostVertexDescriptor vertexDescriptor = boost::add_vertex(m_graph); // 2. Fill with the node m_graph[vertexDescriptor] = pNode; // ... } template <class NodeData, class EdgeData> Edge<NodeData, EdgeData>* BoostGraphWrapper<NodeData, EdgeData>::AddEdge( Node<NodeData>* pNode1, Node<NodeData>* pNode2 ) { Graph<NodeData, EdgeData>::AddEdge(pNode1, pNode2); // 1. Get vertex descriptors of the nodes BoostVertexDescriptor vertexDescriptor1 = GetBoostVertexDescriptor(pNode1); BoostVertexDescriptor vertexDescriptor2 = GetBoostVertexDescriptor(pNode2); Node<NodeData>* tempNode = m_graph[vertexDescriptor1]; Node<NodeData>* tempNode2 = m_graph[vertexDescriptor2]; // 2. Add an empty edge BoostEdgeDescriptor edgeDescriptor; bool inGraph = false; boost::tie(edgeDescriptor,inGraph) = boost::add_edge(vertexDescriptor1, vertexDescriptor2, m_graph); if(!inGraph) { return NULL; } assert(BoostEdgeSize() == 1); // successful // 3. Fill the edge with the vertices Edge<NodeData, EdgeData>* temp = m_graph[edgeDescriptor]; assert(NULL != temp); // fails here //.... return pEdge; } void SomeFunction() { BoostGraphWrapper<int, int> graphWrapper; Node<int>* pNode1 = new Node<int>(); Node<int>* pNode2 = new Node<int>(); Edge<int, int>* pEdge; graphWrapper.AddNode(pNode1); graphWrapper.AddNode(pNode2); pEdge = graphWrapper.AddEdge(pNode2, pNode1); // fails here }

2 6

[proto] learning proto slowly, a small (math)complex library
by alfC 12 Jan '11

12 Jan '11

Hi, I find proto pretty intriguing and I can see the power in it but I am still not able to create a context in which it can help in my design. I also find the Boost.Proto examples very confusing and not usually in the context I always imagine to use the library. There are several concepts that I don't yet fully understand like "context" and "grammars". Also besides the power I see in the library sometimes the resulting syntax in the examples is pretty disappointing, with all those "eval" functions. In general I can't see whether this is a result of limitations of the library or a tool to make the examples more pedagogical. If someone is kind enough to follow me and help me during this discovery of the library along these posts I will continue. The idea of this post is try to bring a simple example of boost at a context that I am able to understand. In order to be useful for many other people I will try to bring proto to a purely mathematical level. Suppose I want to build a new (kind of mathematical) library. Typically I would start defining a lots of arithmetical objects and members and friends operators, all of them eager (member)functions, lots of operators (many bugs also), also use boost.operators (to make less bugs) and then realise that the library has not any real deep mathematical structure on it, not to the compile-time/programmer level. Yes, the program will be able to do a lot of mathematics at runtime via numerical representations but there will be no insight from the point of view of the program code or the "type system". Let's start by an example, I define a complex type, after a lot of work I would have made the equivalent of std::complex<T>. Then the program replaces T by double and the program can (at runtime) do some "math". The problem is that I as a programmer can not do any math with that type. Let me give a concrete example, the complex_unit_circle is a set of complex numbers with modulus =1. One is tempted to implement complex_unit_circle in terms of the "complex type" or some parameterisation (angle). >From a mathematical point of view the complex z is a complex number of course, and z/|z| (z/abs(z)) is not only also a complex number but also potentially a complex_unit_circle element with very spefic properties. For example the product of two elements of the unit circle can be interpreted as a unit circle element again. The only way to express this potentiality at compile time is by expression templates, i.e. in its most glorious state by Boost.Proto. z/abs(z) is really an expression that eventually can be used to construct either another complex number (as type) or a unit circle number (as type). But lets start slower than that, lets build an expression that can be used (potentially) to build a complex number instead. The concrete question of this post will be how to obtain the desired syntax by adding layers to the original posted code. This is what I have done so far: #include <boost/proto/core.hpp> namespace pretty{ namespace proto = boost::proto; struct i_tag{}; proto::terminal< i_tag >::type const i = {{}}; } int main(){ using namespace pretty; 4. + 5.*i; //this will be a complex number (in some sense) return 0; } of course this program does nothing, it is just to show that I can create a expression template with a symbol called "i", this symbol will have properties that will eventually make it equivalent to one of the roots of -1 (mathematically speaking) (but not yet). Note that I didn't define any so called "grammar" or "context" yet. Since the first concern is to be able to use the new code with old code at all intermediate steps in the development, duppose I want to use this kind of expression to construct (in the c++ sense) an existing type, namely std::complex<double>. i.e. I want to be able to write: std::complex<double> z = 4. + 5.*i; or std::complex<double> z(4. + 5.*i); (forget about alternative notations, like 5.*i + 4. or 4. + i*5) The only ways I see this is possible is by adding either a constructor to std::complex<double> or a cast operator of the "expression of type 4.+5.*i" to std::complex<double>. The question for this post, 1) is this true? 2) if yes, then that means that one of the 2 types (type complex or typeof(4.+5.*i) ), will have to be modified (or extendended) in other to accept this syntax. 3) if no , how can I allow this syntax? 4) if the std::complex type is not modifiable, what is the mechanism in proto to define a cast over a certain set of expressions, e.g. of the type of 4.+5.*i. 5) if not, is this syntax not possible at all? is it here where we need to introduce those "eval" functions such as std::complex<double> z = eval_as_complex(4. + 5.*i). The idea is that once I resolve this general questions about the library I will continue building up. (And excuse me for these naive questions along the way). (Note: I know that std::complex<double> had constructor std::complex<double>(4.,5.) and that should be the preferred use, but this post is all about "syntax" and how to use proto, these are just examples). Thank you, Alfredo

4 11

issues with the latest boost numeric bindings
by Simon Mpasi 11 Jan '11

11 Jan '11

To boost users: Greetings! I do not know if this the correct format but here are the issues that I am running into: /boost/numeric/bindings/lapack/detail/ The file clapack.h includes itself causing an error /boost/numeric/bindings/blas/detail/ The file cblas.h includes itself causing an error I changed them to lapack.h and blas.h respectively but I got several errors. I checked out the latest version of numeric bindings from boost.svn this morning. I am using Microsoft Visual Studio 2008 without a Fortran compiler (I need to use clapack) The issues here are that the l lapack routines come with 2 underscores, i.e. _sgesvd_ instead of sgesvd_ I declared BOOST_NUMERIC_BINDINGS_USE_CLAPACK in my driver. Thank you very much in advance for your assistance. Simon N. Mpasi

2 1

[Build] Mimicking my Fedora13 Boost installation.
by Robert Jones 11 Jan '11

11 Jan '11

I have Boost installed as part of my Fedora13/64-bit system, at Boost 1.41. I now want install Boost 1.45, but need to keep the original around for backwards compatibility issues, so I'm putting my 1.45 build somewhere else, and and I want it look as much like the original 1.41 build as possible, but be 1.45. So I built with this command > ./bjam --prefix=/usr/local/boost_1_45_0 threading=single --runtime-link=shared --link=shared --layout=tagged install then listing all the Boost regex (regex chosen at random) I find > find /usr -name 'libboost_regex*' 187532 0 lrwxrwxrwx 1 root root 24 Sep 21 16:25 /usr/lib64/libboost_regex.so -> libboost_regex.so.1.41.0 142821 972 -rwxr-xr-x 1 root root 994792 Jun 4 2010 /usr/lib64/libboost_regex.so.1.41.0 540038 2356 -rw-r--r-- 1 root root 2410606 Jan 11 11:56 /usr/local/boost_1_45_0/lib/libboost_regex.a 540030 1132 -rwxr-xr-x 1 root root 1156757 Jan 11 11:55 /usr/local/boost_1_45_0/lib/libboost_regex.so.1.45.0 540031 0 lrwxrwxrwx 1 root root 24 Jan 11 11:55 /usr/local/boost_1_45_0/lib/libboost_regex.so -> libboost_regex.so.1.45.0 which seems to show an extra .a compared to my Fedora 'default' installation. How come? Do I need it? Can I determine the bjam flags that Fedora used originally? Thx, - Rob.

2 2

[Iterator] advance and random_access_traversal iterators
by Anthony Foglia 11 Jan '11

11 Jan '11

What happened to the patch to add a boost::advance function designed to work with Boost.Iterator's concepts? Three years ago there was a thread pointing out the problem with std::advance not treating random access traversal iterators as random access (because of the reference type). Sebastian Redl posted a patch to add a boost::advance (and boost::distance) function. <http://lists.boost.org/Archives/boost/2007/09/127785.php> I don't see any proof of this patch ever being applied. Someone filed a bug report two years ago to bring attention to the patch, and it still hasn't been applied. <https://svn.boost.org/trac/boost/ticket/2539> Is there a reason it hasn't been applied (the collision with the boost::distance supplied by Boost.Range?) or has it just fallen through the cracks? -- Anthony Foglia Princeton Consultants (609) 987-8787 x233

2 1

Problem compiling under Codegear
by jose perez 10 Jan '11

10 Jan '11

Hello. I’m using CodeGear compiler with Boost 1.39 and Boost 1.45. In both of them I have found an error in mpl\base.hpp line 25 (typedef typename T::base type;) [BCC32 Error] base.hpp(25): E2404 Dependent type qualifier 'na' has no member type named 'base' The code is: namespace boost { namespace mpl { template< typename BOOST_MPL_AUX_NA_PARAM(T) // find in mpl\aux_\na_spec.hpp, line 152: #define BOOST_MPL_AUX_NA_PARAM(param) param = na > struct base { typedef typename T::base type; // <------- ERRORRR BOOST_MPL_AUX_LAMBDA_SUPPORT(1,base,(T)) }; BOOST_MPL_AUX_NA_SPEC(1, base) }} Help will be appreciated. Thanks!

1 0

[mpl] resulting sequence limits
by Igor R 10 Jan '11

10 Jan '11

Hello, I've got 2 mpl::map's, both have less than 20 elements. I copy one to another, and the result has more than 20 elements. I thought that BOOST_MPL_LIMIT_MAP_SIZE macro affects only explicit definitions of maps, not result values of metafunctions, but it turns out that the above case doesn't compile -- until I #include <boost/mpl/map/map30.hpp> Is it behavior "by design", or is it a bug? Thanks.

2 1

[Range] Adaptors
by Robert Jones 10 Jan '11

10 Jan '11

I might be asking for the impossible here, but given the lovely adaptor syntax, eg std::vector<int> vec; boost::copy( vec | boost::adaptors::reversed | boost::adaptors::uniqued, std::ostream_iterator<int>(std::cout) ); I notice it still uses the function call notation in the outermost operation( boost::copy() ), can it be written to eliminate function call syntax completely, say something like vec | boost::adaptors::reversed | boost::adaptors::uniqued | boost::adaptors::copy( std::ostream_iterator<int>(std::cout) ); or even vec | boost::adaptors::reversed | boost::adaptors::uniqued | std::ostream_iterator<int>(std::cout); Thx, - Rob.

5 9

Boost.Regex compile error with gcc 4.6
by Nathan Ridge 10 Jan '11

10 Jan '11

Hello, boost/regex.hpp fails to compile with gcc 4.6, giving the following errors: In file included from /lib/boost/boost/regex/v4/perl_matcher.hpp:578:0, from /lib/boost/boost/regex/v4/regex.hpp:88, from /lib/boost/boost/regex.hpp:31, from test.cpp:1: /lib/boost/boost/regex/v4/perl_matcher_non_recursive.hpp: In member function ‘bool boost::re_detail::perl_matcher<BidiIterator, Allocator, traits>::unwind_short_set_repeat(bool)’: /lib/boost/boost/regex/v4/perl_matcher_non_recursive.hpp:1394:85: error: invalid use of incomplete type ‘const struct boost::regex_traits_wrapper<traits>’ /lib/boost/boost/regex/v4/regex_traits.hpp:163:8: error: declaration of ‘const struct boost::regex_traits_wrapper<traits>’ /lib/boost/boost/regex/v4/perl_matcher_non_recursive.hpp:1394:85: error: invalid type argument of unary ‘*’ (have ‘BidiIterator’) It compiles fine with gcc 4.5. Is this an issue with boost or gcc? Should I report it as a bug? Thanks, Nate.

4 5

[Proto] Storing an Expression Template as a Data Member
by Hossein Haeri 10 Jan '11

10 Jan '11

Dear all, Is there any way I can have classes with data members of type (proto) expression templates? Here is where I get stuck: template<typename T> class MyClass { ... T expression_; }; What type should T be? If you're wondering why on earth I might need that, here is an explanation: Instances of MyClass need to store the lazy calculation they will be performing later on when enough initialisation data is available. Each instance of MyClass has its own FORMULATION for the lazy calculation in terms of the initialisation data. They need to be fed with these formulations and I thought (proto) expression templates will perhaps do the job. But, then, I don't know how to store these formulations until it's time for them to perform... TIA, --Hossein

4 15

multi_index_container: replace() modifies my iterator
by Nicolas Rannou 10 Jan '11

10 Jan '11

Hi all, I'm pretty new in boost and I am experimenting an issue I can't understand. It looks like the usage of "replace()" modifies the iterator I am iterating on: Here is a simple example: it iterates properly if I do: Iterator it2, it3; boost::tuples::tie(it2, it3) = m_Container.get< CollectionID >().equal_range( 30 ); while( it2!= it3 ) { int time = it2->TCoord; if( time < 500 ) // we want to change the collection ID in this case { Structure tempStructure(*it2); tempStructure.CollectionID = 40; * //m_Container.get< CollectionID >().replace(it2, tempStructure); comment this line* } ++it2; } whereas if I call "replace()" the iterator value changes to "it3" then it exists the loop: Iterator it2, it3; boost::tuples::tie(it2, it3) = m_Container.get< CollectionID >().equal_range( 30 ); while( it2!= it3 ) { int time = it2->TCoord; if( time < 500 ) // we want to change the collection ID in this case { Structure tempStructure(*it2); tempStructure.CollectionID = 40; * m_Container.get< CollectionID >().replace(it2, tempStructure);* } ++it2; } the replace() method returns true. I must be missing something but after reading the documentation and some researches on the web I couldn't find the answer. Any help/explanation would be greatly appreciated, Thanks, Nicolas

3 3

using '\0' as separator in char_separator and tokenizer classes
by kmulla＠mail.com 10 Jan '11

10 Jan '11

Hi All, I am trying to use boost::tokenizer to tokenize a string containing embedded '\0' characters. I am using boost::char_separator to specify the separator. I am not getting correct tokens when I am using '\0' as the separator. Here I am curious to know, if it is indeed possible to use '\0' as separator in boost::char_separator class. I am pretty much using the code in the example given on below link. I know my code works since I am getting correct results with different separator values. http://www.boost.org/doc/libs/1_45_0/libs/tokenizer/char_separator.htm Best, K Mulla

1 0

[boost][Serialization] - xml-stylesheet tag not recognized
by girish hilage 08 Jan '11

08 Jan '11

Hi, I am trying to learn how to read an XML file using boost-serialization. The code snippet of a sample program is as follows : void restore_schedule(bus_schedule &s, const char * filename) { // open the archive std::ifstream ifs(filename); assert(ifs.good()); boost::archive::xml_iarchive ia(ifs); // restore the schedule from the archive ia >> BOOST_SERIALIZATION_NVP(s); } First few lines of demo.xml are as follows : <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <?xml-stylesheet type="text/xsl" href="XSLTFile.xsl"?> <!DOCTYPE boost_serialization> <boost_serialization signature="serialization::archive" version="6"> But this gives me below error : $ ./a.out terminate called after throwing an instance of 'boost::archive::xml_archive_exception' what(): unrecognized XML syntax If I remove the line : <?xml-stylesheet type="text/xsl" href="XSLTFile.xsl"?> from demo.xml then it works fine. Can you please let me know if there is any workaround for this problem? Currently I am using Fedora Core 13 with boost-serialization-1.41.0-7.fc13.i686. Is this case handled in latest boost release? Regards, Girish

2 1

[signals vs. signals2] Slot connecting another slot to invoking signal
by Boris Schaeling 08 Jan '11

08 Jan '11

The Boost.Signals2 documentation at http://www.boost.org/doc/libs/1_45_0/doc/html/signals2/thread-safety.html says: "Suppose a user writes a slot which connects another slot to the invoking signal. Will the newly connected slot be run during the same signal invocation in which the new connection was made? The answer is no." I'm trying to find out what Boost.Signals has to say about it. A quick test program shows that Boost.Signals does call the newly connected slot. I'm not sure though if this is undefined behavior as connecting another slot might invalidate the iterators used by the combiner? Boris

1 0

[serialization] polymorphic archives in dlls and pointer to derived problems
by Kolb, Jeremy 07 Jan '11

07 Jan '11

I'm having a lot of trouble getting serialization of derived classes through a base pointer working across dlls. I have the following: DLL (data_types.dll) code: stdafx.h: #pragma once #include "targetver.h" #define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers // Windows Header Files: #include <windows.h> #pragma warning(disable: 4308) #include "boost/archive/polymorphic_iarchive.hpp" #include "boost/archive/polymorphic_oarchive.hpp" #include "boost/serialization/nvp.hpp" Base.h: #pragma once #include "boost/serialization/export.hpp" class __declspec(dllexport) Base { friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const unsigned int version); public: Base() {} virtual ~Base() {} int i; }; BOOST_SERIALIZATION_ASSUME_ABSTRACT(Base); // Doesn't make a difference. BOOST_CLASS_EXPORT_KEY(Base); Base.cpp: #include "stdafx.h" #include "Base.h" template<class Archive> void Base::serialize(Archive& ar, const unsigned int version) { ar & BOOST_SERIALIZATION_NVP(i); } BOOST_CLASS_EXPORT_IMPLEMENT(Base); template void __declspec(dllexport) Base::serialize(boost::archive::polymorphic_iarchive& ar, const unsigned int version); template void __declspec(dllexport) Base::serialize(boost::archive::polymorphic_oarchive& ar, const unsigned int version); Derived.h: #include "Base.h" class __declspec(dllexport) Derived : public Base { friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const unsigned int version); public: Derived() {} Derived(int num) : j(num) {} int j; }; BOOST_CLASS_EXPORT_KEY(Derived); Derived.cpp: #include "stdafx.h" #include "Derived.h" template<class Archive> void Derived::serialize(Archive& ar, const unsigned int version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Base); ar & BOOST_SERIALIZATION_NVP(j); } BOOST_CLASS_EXPORT_IMPLEMENT(Derived); template void __declspec(dllexport) Derived::serialize(boost::archive::polymorphic_iarchive& ar, const unsigned int version); template void __declspec(dllexport) Derived::serialize(boost::archive::polymorphic_oarchive& ar, const unsigned int version); My exe links against the DLL and contains the following: #include "stdafx.h" #include "boost/archive/polymorphic_xml_iarchive.hpp" #include "boost/archive/polymorphic_xml_oarchive.hpp" #include "data_types/Derived.h" #include <fstream> int _tmain(int argc, _TCHAR* argv[]) { std::ofstream f("c:\\test.xml"); boost::archive::polymorphic_xml_oarchive xml(f); Base* b = new Derived(123); xml & BOOST_SERIALIZATION_NVP(b); delete b; return 0; } When serializing this fails with unregistered_class even though I export both Base and Derived. Jeremy

2 10

How to get bug reports addressed
by Geoffrey Romer 07 Jan '11

07 Jan '11

I'm responsible for maintaining the local Boost install for a large group of developers, and I find myself spending an inordinate amount of time reapplying our local patches for Boost bugs every time a new version comes out, seemingly with no end in sight. One obvious example is https://svn.boost.org/trac/boost/ticket/3645: the report is clear and specific, documents a real bug, and provides a trivial patch which completely resolves the issue. It's everything one could possibly want in a bug report, and it has been utterly ignored for over a year. In my experience this has been the rule rather than the exception; other examples that I've been personally acquainted with include http://lists.boost.org/Archives/boost/2009/06/153214.php, https://svn.boost.org/trac/boost/ticket/4918, and https://svn.boost.org/trac/boost/ticket/4919. In every case the reporters have done everything they could to provide a useful bug report, up to and including providing patches, but have been met with profound silence. Does anyone have any suggestions for how to get action in these situations?

7 8

[DateTime] Daily Schedules
by John Rocha 07 Jan '11

07 Jan '11

I was looking at the DateTime library for a scheduling module in my application. I was very excited to see time periods (time_period) and its method contains(). I could set up a time_period for say 8:00-17:00, and then when something happened I could create a ptime and see if the time_period contains my ptime. (i.e. did my action happen between 8:00 and 17:00.) However, I realized that a time period is much more specific than I want. A time_period is tied to a specific date, i.e. 8:00-17:00 on Sep. 20 1999. I read the documentation, and I didn't see (or missed) anything that might be what I would call an hour period -- a range of time that is independent of the date. I don't think it's a duration, because I understood that to mean the amount of time between two time points (i.e. +/- 5 hours). I have some ideas on how I might extend this to achieve what I want, but before going that route, I wanted to double check if others have encountered this and if so how they resolved it. Was it done with a bit of the library that I'm overlooking? Or did you have to extend the class to achieve the desired results? Thanks in advance, -=John

4 6

[boost][Serialization] - about macro BOOST_CLASS_VERSION
by girish hilage 07 Jan '11

07 Jan '11

Hi, I have a query regarding macro BOOST_CLASS_VERSION(). I am running following code : class testRep { friend std::ostream & operator<<(std::ostream &os, const testRep &tr); public : template<class Archive> void serialize(Archive &ar, const unsigned int version) { if(version >= 2) ar & BOOST_SERIALIZATION_NVP(Site); } private : string Site; }; BOOST_CLASS_VERSION(testRep, 2) std::ostream & operator<<(std::ostream &os, const testRep &tr) { return os << '\n' << tr.Site << endl; } void read_file (testRep &s, const char * filename) { std::ifstream ifs(filename); assert (ifs.good()); boost::archive::xml_iarchive ia(ifs); ia >> BOOST_SERIALIZATION_NVP(s); } int main (void) { testRep tr; read_file (tr, "Test.xml"); cout << tr << endl; return 0; } This code runs fine. But, if I remove the statement : BOOST_CLASS_VERSION(testRep, 2) then I get following error : terminate called after throwing an instance of 'boost::archive::archive_exception' what(): class version Aborted (core dumped) So, want to ask if it is mandatory to declare a macro BOOST_CLASS_VERSION()? and if not then how do I prevent this runtime error from happening? Regards, Girish

1 0

[Off topic] Strict Aliasing white paper redux
by Patrick Horgan 07 Jan '11

07 Jan '11

Some time ago, I posted a link here to my (then new) white paper on strict-aliasing. I wrote it because people keep posting, on this and on other lists, questions that show a basic misunderstanding of aliasing and what the rules in C and C++ standards on aliasing are intended to communicate. I got some great feedback and have posted a new revision, http://dbp-consulting.com/StrictAliasing.pdf. I'm hoping that people on this list will review the paper and tell me some more ways of improving it. My intention is to write a paper that will make it so that I won't have to keep answering the same questions over and over again;) I'll just point people at the paper. Best regards, Patrick

6 11

1.45: thread/condition_variable.hpp: unused variable 'res' warning, gcc 4.2
by Hicham Mouline 06 Jan '11

06 Jan '11

hello, in Release build in Xcode, gcc 4.2.1, inline void condition_variable::wait(unique_lock<mutex>& m) { ... int const res = pthread_cond_wait(&cond, &internal_mutex); BOOST_ASSERT(!res); ... } Unused variable 'res' is gcc mistaken? regards,

3 4

Re: [Boost-users] [FunctionTypes] function_arity for non-built-ins
by Hossein Haeri 06 Jan '11

06 Jan '11

Hi Roman, > This is actually possible in most cases. Check this nice article by Eric > Niebler: http://www.boost.org/doc/libs/1_45_0/doc/html/proto/appendices.html#boost_p… This is beautiful, thanks! :) So, from the description, it seems like this can_be_called guy (or its siblings) is in heavy use for Proto. Does Proto then also port this as a part of its toolbox? Or, is it only for internal use and I'll need to craft my own version of it? TIA, --Hossein

4 7

Re: [Boost-users] [ asio ] how to determine if a server is overloaded ?
by Avi Bahra 06 Jan '11

06 Jan '11

ecyrb wrote> >Server overload does not come from network overload, but from service >overload. If you can't serve (compute) more requests/s than the network >load, your server is overloaded... >You can compute your server overload by queuing requests. If your queue >becomes too big, you can consider that your server is under heavy pressure >and take appropriate measures to circumvent the flow of requests (load >balancing etc...) Is there any asio example in the docs, which demostrate this Does the io_service expose the queue of request/connections as I have not seen such an api ? or do you mean that server should be structured to maintain its _own_ queue.( as apposed to the queue in io_service) Request are then handled from this internal queue? Best regards, Ta, Avi

1 0

[Accumulators] Retract samples
by Alex Hagen-Zanker 06 Jan '11

06 Jan '11

Dear all, I am considering using Boost Accumulators for a moving window calculation. When a window would step from left to right, it should add the sample on the right side of the window and retract the sample on the left side on each step. For weighted accumulators, it might be possible to use negative weights. But, since the accumulators do not appear to be intended for this use, there may be implementation details that invalidate the use of negative weights. Is there a recommended way to retract samples in Boost Accumulators? Thanks, Alex p.s. the general idea: void movingwindowsum(const vector<double>& in, vector<double>& out, size_t radius ) { size_t n = in.size(); double sum = 0; // This should be an accumulator for(size_t i = 0; i < min(n, radius); ++i) { sum += in[i ]; // add sample } out.resize(n); for(size_t i = 0; i < n; ++i) { size_t left = i - radius - 1; size_t right = i + radius; if (left >= 0) sum -= in[left]; // retract sample if (right < n) sum += in[right]; // add sample out[i] = sum; }

2 5

boost::signals2 connection management
by frares＠gmail.com 06 Jan '11

06 Jan '11

Hi, all If I have one only signal that can be connected at different times to several different slots, then I create several boost::signals2::connection, one for each slot but for that same only signal, if I disconnect one of the connections, will all connections be disconnected or just that particular slot? If this is not the way to disconnect specific individual signal/slot connections, how do I do it? I have to use "boost::bind" for the connections are from signals and slots of different classes, and I cannot use scoped connections because asynchronous tasks are being performed (and signaled). Thanks Francisco

2 1

streaming of tuples - adjusting field widths?
by Christian Meesters 06 Jan '11

06 Jan '11

Hi, Having the following code (where 'out' is a std::ostream): out << boost::tuples::set_open('[') << boost::tuples::set_close(']') << boost::tuples::set_delimiter(',') << std::setw(21) << std::right << get_some_tuple(); I expected to see the tuple in a column of 21 spaces, adjusted to the right. Instead, the tuple is appended on 21 spaces. Any hint on what my mistake is? TIA Christian

2 2

regex linker issue/
by John Hendrix 06 Jan '11

06 Jan '11

Hi all, I just downloaded boost and I am attempting to create a trivial program. This my first attempt to develop boost on Fedora. Here is what I did: 1) downloaded boost_1_45_0 2) ./bootstrap.sh 3) ./bjam toolset=gcc variant=debug link=static --address-model=64 --with-regex All of these step ran uneventfully I then created a "hello world" regex program: // regex-test.cpp #include <string> #include <iostream> #include <boost/regex.hpp> int main( int argc, char * argv[] ) { // boost::regex pattern ("b.lug",boost::regex_constants::icase|boost::regex_constants::perl); std::string stringa ("Searching for bolug"); std::string replace ("BgLug"); std::string newString; // newString = boost::regex_replace (stringa, pattern, replace); printf("The new string is: |%s|\n",newString.c_str()); return 0; } To compile and link: g++ -o regex-test -I../../boost/boost_1_45_0/ -L../../boost/boost_1_45_0/stage/lib/ -lboost_regex regex-test.cpp If all of the boost::whatever code is commented-out then it compiles and links fine. [root@fc5-virt64 upstream]# g++ -o regex-test -I../../boost/boost_1_45_0/ -L../../boost/boost_1_45_0/stage/lib/ -lboost_regex regex-test.cpp [root@fc5-virt64 upstream]# ./regex-test The new string is: || [root@fc5-virt64 upstream]# However, if I, say, uncomment-out the first line of code I get: [root@fc5-virt64 upstream]# g++ -o regex-test -I../../boost/boost_1_45_0/ -L../../boost/boost_1_45_0/stage/lib/ -lboost_regex regex-test.cpp /tmp/ccDG8tmV.o: In function `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)': regex-test.cpp:(.text._ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j[boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)]+0x27): undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)' collect2: ld returned 1 exit status [root@fc5-virt64 upstream]# Does anyone have any suggestions? johnh

2 2

[ asio ] how to determine if a server is overloaded ?
by Avi Bahra 06 Jan '11

06 Jan '11

I am experimenting with boost asio & serialisation. and have created a test server based on the corresponding example in the asio tutorial. This is a simple single threaded server. The stress testing I have done, shows I get different results on different platforms. This is expected. However I need a way of determining when the server can not cope with the load. This allows me to inform the user. Currently I have used typical requests to stress test the server. This shows the server handles ~1000 requests/sec in debug under ideal conditions, on localhost. Does this means that if I continue to receive 1000/request sec over a several sec/minutes, then the server must be overloaded. Is this the right way of thinking about the problem or am I "barking up the wrong tree". Can any one provide any insights about how one goes about determining when a asio server is overloaded ? Any help appreciated. Best regards, Ta, Avi

2 1

transform_iterator::reference
by Matwey V. Kornilov 06 Jan '11

06 Jan '11

Hi, Boost 1.42.0 documentation of transfrom_iterator says: "If Reference is use_default then the reference member of transform_iterator is result_of<UnaryFunction(iterator_traits<Iterator>::reference)>::type. Otherwise, reference is Reference." But it is simply implemented as UnaryFunction::result_type; This discrepancy between documentation and implementation plays a role when I want to use transform_iterator with boost::mem_fn to access member variable of structure. mem_fn's operator() is overridden to provide both const and non-const access to member variable. The discrepancy leads to compilation error for non-const access.

2 2

[FunctionTypes] function_arity for non-built-ins
by Hossein Haeri 06 Jan '11

06 Jan '11

Dear all, How can I calculate the arity of function-objects? Obviously, function_arity won't do the job for that's only for built-ins. For instance, I need something like: function_types::function_object_arity<std::plus<double> >::value Anything in Boost for that? TIA, --Hossein

4 5

[Proto] result_of::value
by Hossein Haeri 06 Jan '11

06 Jan '11

Dear all, I have a piece of code in which contains: template<typename L, typename R> void FuncStreamCtx::operator () (tag::shift_right, const L& l, const R& r) const { evaluate_helper(l, *this); const typename result_of::value<R>::type f = value(r); } When I compile this under GCC 4.5.1 (MinGW, WinXP, SP3), I get a large spew of warnings. My related piece of code which I guess would be helpful is: double plus1(double i) {return i + 1;} double plus2(double i) {return i + 2;} struct FuncStreamCtx: callable_context<const FuncStreamCtx, null_context> { FuncStreamCtx() {} typedef void result_type; void operator () (tag::terminal, double) const; template<typename L, typename R> void operator () (tag::shift_right, const L&, const R&) const; const vector<double>& state() const {return data_;} private: void set_single_value(double) const; mutable vector<double> data_; }; template<typename Expr> const vector<double>& evaluate_helper(const Expr& e, const FuncStreamCtx& ctx) { boost::proto::eval(e, ctx); return ctx.state(); } template<typename Expr> void evaluate(const Expr& e, vector<double>& v) { const FuncStreamCtx ctx; v = evaluate_helper(e, ctx); } template<typename L, typename R> void FuncStreamCtx::operator () (tag::shift_right, const L& l, const R& r) const { evaluate_helper(l, *this); const typename result_of::value<R>::type f = value(r); } int main() { vector<double> v; evaluate(lit(51.6) >> &plus2 >> &plus2 >> &plus1, v); cout << "Result = "; copy(v.begin(), v.end(), ostream_iterator<double>(cout, " ")); return 0; } I have also included the warnings in the P.S. Any idea what the compiler is saying? And, should I do anything about it? TIA, --Hossein P.S. -------------- Build: Debug in ProtoGame3 --------------- Compiling: main.cpp D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp: In member function 'void FuncStreamCtx::operator()(boost::proto::tag::shift_right, const L&, const R&) const [with L = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, R = boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l>]': D:\Sources\Boost\boost_1_42_0/boost/proto/context/callable.hpp:313:21: instantiated from 'boost::proto::context::callable_eval<Expr, Context, 2l>::result_type boost::proto::context::callable_eval<Expr, Context, 2l>::operator()(Expr&, Context&) const [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = const FuncStreamCtx, boost::proto::context::callable_eval<Expr, Context, 2l>::result_type = void]' D:\Sources\Boost\boost_1_42_0/boost/proto/eval.hpp:100:62: instantiated from 'typename boost::proto::result_of::eval<Expr, Context>::type boost::proto::eval(Expr&, const Context&) [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = FuncStreamCtx, typename boost::proto::result_of::eval<Expr, Context>::type = void]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:44:2: instantiated from 'const std::vector<double>& evaluate_helper(const Expr&, const FuncStreamCtx&) [with Expr = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:52:2: instantiated from 'void evaluate(const Expr&, std::vector<double>&) [with Expr = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:80:53: instantiated from here D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:74:43: warning: unused variable 'f' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp: In member function 'void FuncStreamCtx::operator()(boost::proto::tag::shift_right, const L&, const R&) const [with L = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, R = boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l>]': D:\Sources\Boost\boost_1_42_0/boost/proto/context/callable.hpp:313:21: instantiated from 'boost::proto::context::callable_eval<Expr, Context, 2l>::result_type boost::proto::context::callable_eval<Expr, Context, 2l>::operator()(Expr&, Context&) const [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = const FuncStreamCtx, boost::proto::context::callable_eval<Expr, Context, 2l>::result_type = void]' D:\Sources\Boost\boost_1_42_0/boost/proto/eval.hpp:100:62: instantiated from 'typename boost::proto::result_of::eval<Expr, Context>::type boost::proto::eval(Expr&, const Context&) [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = FuncStreamCtx, typename boost::proto::result_of::eval<Expr, Context>::type = void]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:44:2: instantiated from 'const std::vector<double>& evaluate_helper(const Expr&, const FuncStreamCtx&) [with Expr = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:73:2: instantiated from 'void FuncStreamCtx::operator()(boost::proto::tag::shift_right, const L&, const R&) const [with L = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, R = boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l>]' D:\Sources\Boost\boost_1_42_0/boost/proto/context/callable.hpp:313:21: instantiated from 'boost::proto::context::callable_eval<Expr, Context, 2l>::result_type boost::proto::context::callable_eval<Expr, Context, 2l>::operator()(Expr&, Context&) const [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = const FuncStreamCtx, boost::proto::context::callable_eval<Expr, Context, 2l>::result_type = void]' D:\Sources\Boost\boost_1_42_0/boost/proto/eval.hpp:100:62: instantiated from 'typename boost::proto::result_of::eval<Expr, Context>::type boost::proto::eval(Expr&, const Context&) [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = FuncStreamCtx, typename boost::proto::result_of::eval<Expr, Context>::type = void]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:44:2: instantiated from 'const std::vector<double>& evaluate_helper(const Expr&, const FuncStreamCtx&) [with Expr = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:52:2: instantiated from 'void evaluate(const Expr&, std::vector<double>&) [with Expr = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:80:53: instantiated from here D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:74:43: warning: unused variable 'f' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp: In member function 'void FuncStreamCtx::operator()(boost::proto::tag::shift_right, const L&, const R&) const [with L = boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>, R = boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l>]': D:\Sources\Boost\boost_1_42_0/boost/proto/context/callable.hpp:313:21: instantiated from 'boost::proto::context::callable_eval<Expr, Context, 2l>::result_type boost::proto::context::callable_eval<Expr, Context, 2l>::operator()(Expr&, Context&) const [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = const FuncStreamCtx, boost::proto::context::callable_eval<Expr, Context, 2l>::result_type = void]' D:\Sources\Boost\boost_1_42_0/boost/proto/eval.hpp:100:62: instantiated from 'typename boost::proto::result_of::eval<Expr, Context>::type boost::proto::eval(Expr&, const Context&) [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = FuncStreamCtx, typename boost::proto::result_of::eval<Expr, Context>::type = void]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:44:2: instantiated from 'const std::vector<double>& evaluate_helper(const Expr&, const FuncStreamCtx&) [with Expr = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:73:2: instantiated from 'void FuncStreamCtx::operator()(boost::proto::tag::shift_right, const L&, const R&) const [with L = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, R = boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l>]' D:\Sources\Boost\boost_1_42_0/boost/proto/context/callable.hpp:313:21: instantiated from 'boost::proto::context::callable_eval<Expr, Context, 2l>::result_type boost::proto::context::callable_eval<Expr, Context, 2l>::operator()(Expr&, Context&) const [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = const FuncStreamCtx, boost::proto::context::callable_eval<Expr, Context, 2l>::result_type = void]' D:\Sources\Boost\boost_1_42_0/boost/proto/eval.hpp:100:62: [ skipping 2 instantiation contexts ] D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:73:2: instantiated from 'void FuncStreamCtx::operator()(boost::proto::tag::shift_right, const L&, const R&) const [with L = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, R = boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l>]' D:\Sources\Boost\boost_1_42_0/boost/proto/context/callable.hpp:313:21: instantiated from 'boost::proto::context::callable_eval<Expr, Context, 2l>::result_type boost::proto::context::callable_eval<Expr, Context, 2l>::operator()(Expr&, Context&) const [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = const FuncStreamCtx, boost::proto::context::callable_eval<Expr, Context, 2l>::result_type = void]' D:\Sources\Boost\boost_1_42_0/boost/proto/eval.hpp:100:62: instantiated from 'typename boost::proto::result_of::eval<Expr, Context>::type boost::proto::eval(Expr&, const Context&) [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>, Context = FuncStreamCtx, typename boost::proto::result_of::eval<Expr, Context>::type = void]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:44:2: instantiated from 'const std::vector<double>& evaluate_helper(const Expr&, const FuncStreamCtx&) [with Expr = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:52:2: instantiated from 'void evaluate(const Expr&, std::vector<double>&) [with Expr = boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const double&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> >, 2l>]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:80:53: instantiated from here D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:74:43: warning: unused variable 'f' Linking console executable: bin\Debug\ProtoGame3.exe Output size is 1.08 MB Process terminated with status 0 (0 minutes, 4 seconds) 1 errors, 3 warnings

2 4

Problems in CodeGear
by jose perez 06 Jan '11

06 Jan '11

Hello. I'm unable to compile boost in Embarcadero 2010 (CodeGear) version 0x621. My code is really simple: #include "boost/random/mersenne_twister.hpp" This produces this error: [BCC32 Error] mersenne_twister.hpp(63): E2299 Cannot generate template specialization from 'detail::disable_constructor<Engine,T>' in the line: BOOST_RANDOM_DETAIL_GENERATOR_CONSTRUCTOR(mersenne_twister, Generator, gen) { seed(gen); } I have preprocessed my .cpp in order to see if boost gets correctly self configured for CodeGear compiler. It does very well, because it enters into codegear.hpp. But the last checked version of the CodeGear compiler is 0x620, and my version is 0x621. I have tried to change this line: // versions check: // last known and checked version is 0x620 #if (__CODEGEARC__ > 0x621) and this one: // CodeGear C++ Builder 2010 #if (__CODEGEARC__ <= 0x621) / # define BOOST_NO_TYPENAME_WITH_CTOR // Cannot use typename keyword when making temporaries of a dependant type etc... so that the compiler ignores or enters those sections, but nothing changes. It seems slightly strange to me that version 0x620 and 0x621 are SO different that boost is unable to get compiled. This problem has raised when trying to compile my application with libLAS library, which uses guid.hpp (which uses mersenne_twister.hpp), and there are much more compiler errors than the one I am explaining here. I guess (and hope) they are part of the same problem. No problems arise with other boost modules like, for example, "boost/smart_ptr.hpp". Help will be appreciated. Thanks!

2 6

Why we are still using boost 1.37
by Robert Lupton the Good 06 Jan '11

06 Jan '11

>> But I'm curious to know why you are still using 1.42. Well, I'm still using 1.37 for a large astronomical software project (the LSST). To quote one of the developers: > There have been changes to boost::serialization between these two > versions that break our persistence code. The issues appear in test > segfaults for packages at the afw level and higher. We could presumably find the problem in our code (or what's changed in boost::serialization) but that's real work. It's easier to patch boost::gil 1.37 to work with gcc 4.4 (or was it 4.5)? R

2 1

Re: [Boost-users] [Proto] callable_context
by Hossein Haeri 05 Jan '11

05 Jan '11

Dear Erik, > > lit(1) >> &f >> &g >> &h > > > > So, what about this new one in Proto? > > Yes, that should be doable. OK, that's good news. Here is my attempt to get it done (assuming that we only pipe integers into series of functions): struct FuncStreamCtx: callable_context<const FuncStreamCtx> { FuncStreamCtx() {} typedef int result_type; int operator () (tag::terminal, int i) const {return i;} template<typename L, typename R> int operator () (tag::shift_right, const L& l, const R& r) const { int arg = eval<L, const FuncStreamCtx>(l, *this);//*** int (*f) (int) = value(r); return f(arg); } }; (I know you told me that contexts make life hard. But, I'm not still comfortable with transforms...) Now, when I try to compile this code (GCC 4.5.1, MinGW32, WinXP, SP3), I get the error in the P.S. for trying it with: cout << eval(lit(51) >> &plus2, ctx); >From what I understand, from line ***, GCC mistakenly thinks that I'm trying to instantiate eval<> and fails to find an appropriate ctor -- it only nags about finding the default and the copy one. Strangely enough, when I remove the template arguments from the same line, I get: error: missing template arguments before '(' token Any ideas? TIA, --Hossein P.S. -------------- Build: Debug in ProtoGame3 --------------- Compiling: main.cpp D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp: In member function 'int FuncStreamCtx::operator()(boost::proto::tag::shift_right, const L&, const R&) const [with L = boost::proto::utility::literal<const int&, boost::proto::domainns_::default_domain>, R = boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<int (* const&)(int)>, 0l>]': D:\Sources\Boost\boost_1_42_0/boost/proto/context/callable.hpp:313:21: instantiated from 'boost::proto::context::callable_eval<Expr, Context, 2l>::result_type boost::proto::context::callable_eval<Expr, Context, 2l>::operator()(Expr&, Context&) const [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const int&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<int (* const&)(int)>, 0l> >, 2l>, Context = const FuncStreamCtx, boost::proto::context::callable_eval<Expr, Context, 2l>::result_type = int]' D:\Sources\Boost\boost_1_42_0/boost/proto/eval.hpp:100:62: instantiated from 'typename boost::proto::result_of::eval<Expr, Context>::type boost::proto::eval(Expr&, const Context&) [with Expr = const boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::utility::literal<const int&, boost::proto::domainns_::default_domain>&, boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<int (* const&)(int)>, 0l> >, 2l>, Context = FuncStreamCtx, typename boost::proto::result_of::eval<Expr, Context>::type = int]' D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:38:37: instantiated from here D:\My Documents\My Programmes\Tutorial\Proto\ProtoGame3\main.cpp:23:50: error: no matching function for call to 'boost::proto::context::callable_context<const FuncStreamCtx>::eval<boost::proto::utility::literal<const int&, boost::proto::domainns_::default_domain> >::eval(const boost::proto::utility::literal<const int&, boost::proto::domainns_::default_domain>&, const FuncStreamCtx&)' D:\Sources\Boost\boost_1_42_0/boost/proto/context/callable.hpp:223:17: note: candidates are: boost::proto::context::callable_context<const FuncStreamCtx>::eval<boost::proto::utility::literal<const int&, boost::proto::domainns_::default_domain> >::eval() D:\Sources\Boost\boost_1_42_0/boost/proto/context/callable.hpp:223:17: note: boost::proto::context::callable_context<const FuncStreamCtx>::eval<boost::proto::utility::literal<const int&, boost::proto::domainns_::default_domain> >::eval(const boost::proto::context::callable_context<const FuncStreamCtx>::eval<boost::proto::utility::literal<const int&, boost::proto::domainns_::default_domain> >&) Process terminated with status 1 (0 minutes, 19 seconds) 3 errors, 0 warnings

1 1

Boost.Iostreams devices and unsigned char character types
by laanan fisher 05 Jan '11

05 Jan '11

Hi, I'm having some trouble using boost::iostreams::basic_file (and other devices) with unsigned char character types. It's likely a lack of understanding on my part, so any help is greatly appreciated. Here is what I'd like to do, and the results from my g++ v4.5.0 compilation. Thanks for your time. # include <boost/iostreams/device/file.hpp> # include <boost/iostreams/get.hpp> int main() { namespace io = boost::iostreams; io::basic_file_source< unsigned char > file( "us.cpp" ); int ch = io::get( file ); return 0; } /* In file included from d:/boost_1_45_0/boost/iostreams/detail/adapter/non_blockin g_adapter.hpp:12:0, from d:/boost_1_45_0/boost/iostreams/close.hpp:19, from d:/boost_1_45_0/boost/iostreams/operations.hpp:16, from d:/boost_1_45_0/boost/iostreams/device/file.hpp:23, from us.cpp:1: d:/boost_1_45_0/boost/iostreams/read.hpp: In static member function 'static type name boost::iostreams::int_type_of<T>::type boost::iostreams::detail::read_devic e_impl<boost::iostreams::input>::get(T&) [with T = boost::iostreams::basic_file_ source<unsigned char>, typename boost::iostreams::int_type_of<T>::type = long un signed int]': d:/boost_1_45_0/boost/iostreams/read.hpp:47:60: instantiated from 'typename bo ost::iostreams::int_type_of<T>::type boost::iostreams::get(T&) [with T = boost:: iostreams::basic_file_source<unsigned char>, typename boost::iostreams::int_type _of<T>::type = long unsigned int]' us.cpp:10:28: instantiated from here d:/boost_1_45_0/boost/iostreams/read.hpp:180:42: error: incomplete type 'boost:: iostreams::detail::read_device_impl<boost::iostreams::input>::get(T&) [with T = boost::iostreams::basic_file_source<unsigned char>, typename boost::iostreams::i nt_type_of<T>::type = long unsigned int]::traits_type' used in nested name speci fier d:/boost_1_45_0/boost/iostreams/read.hpp:180:42: error: incomplete type 'boost:: iostreams::detail::read_device_impl<boost::iostreams::input>::get(T&) [with T = boost::iostreams::basic_file_source<unsigned char>, typename boost::iostreams::i nt_type_of<T>::type = long unsigned int]::traits_type' used in nested name speci fier d:/boost_1_45_0/boost/iostreams/read.hpp:180:42: error: incomplete type 'boost:: iostreams::detail::read_device_impl<boost::iostreams::input>::get(T&) [with T = boost::iostreams::basic_file_source<unsigned char>, typename boost::iostreams::i nt_type_of<T>::type = long unsigned int]::traits_type' used in nested name speci fier */

2 1

Local_date_time constructor question
by qplace 05 Jan '11

05 Jan '11

Documentation for local_date_time constructor local_date_time(...) Parameters: date time_duration time_zone_ptr bool states that the last parameter, "The DST flag", "must be passed to indicate whether the time is in daylight savings or not." My question is: Isn't the combination of the first parameter, "date" and third parameter, "time_zone_ptr" determine if the resulted local_date_time will be either in the daylight saving time period or not?

3 3

filtering stream fpos
by Christian Meesters 05 Jan '11

05 Jan '11

Hi, is there something like fpos for boost's filtering streams? If so, I must have overlooked it in the docs. Or, if this fpos-thing does not work out: I would like to remember the position where I left a (potentially gzipped) file and resume work (reading only) on that file in subsequent function calls. Is this somehow possible? TIA Christian PS Happy New Year everybody! (Better late than never ...)

1 0

Moving my Boost installation
by Robert Jones 05 Jan '11

05 Jan '11

I have Boost installed under Fedora13 in /usr/include, not installed by me, but I imagine done as part of installing Fedora. I have a codebase that uses Boost and builds perfectly, using gcc 4.5.1 Now, if I move my Boost installation mv /usr/include/boost ~rgj/xx and add an appropriate include directive to my compile lines, I get compile errors from Boost headers /home/rgj/xx/boost/date_time/gregorian/conversion.hpp: In function ‘tm boost::gregorian::to_tm(const boost::gregorian::date&)’: /home/rgj/xx/boost/date_time/gregorian/conversion.hpp|44 col 23| error: missing initializer for member ‘tm::tm_sec’ etc, etc Obviously I'm having a minor aberration here...what am I doing wrong? Thx, - Rob.

2 2

[property_tree] Parsing JSON
by Olivier Tournaire 05 Jan '11

05 Jan '11

Hi all, I am currently trying to parse a JSON file, but cannot figure how to achieve this task (see for instance http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/wa/wsSearch?term=… ). Here is a piece of code: #ifndef ITUNES_JSON_STRUCTURE_HPP #define ITUNES_JSON_STRUCTURE_HPP #include <boost/property_tree/ptree.hpp> #include <string> class itunes_json_structure { public: void load(const std::string &filename); boost::property_tree::ptree m_ptree; }; #endif // ITUNES_JASON_STRUCTURE_HPP #include "itunes_jason_structure.hpp" #include <boost/property_tree/json_parser.hpp> #include <iostream> using namespace std; void itunes_json_structure::load(const string &filename) { using boost::property_tree::ptree; try { // Load the JSON file into the property tree. If reading fails // (cannot open file, parse error), an exception is thrown. read_json(filename, m_ptree); cout << "resultCount = " << m_ptree.get<string>("resultCount") << endl; ptree all_results = m_ptree.get_child("results"); // HERE!!! How can I read the content of the "results" node???? } catch(exception &e) { throw e; } } I am unable to read the content of the "results" node. Could you please give me some help? Regards, Olivier

6 18

[math] fpclassify.hpp fails to compile with Intel icc 11.1
by Gabriel Redner 05 Jan '11

05 Jan '11

Hi all, The following code fails to compile with icc 11.1 under Linux: ========== #include <boost/math/special_functions/fpclassify.hpp> int main() {} ========== The full error is: ========== /usr/include/c++/4.4.5/cmath(500): error: identifier "__builtin_fpclassify" is undefined return __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_NORMAL, ^ detected during: instantiation of "__gnu_cxx::__enable_if<std::__is_arithmetic<_Tp>::__value, int>::__type std::fpclassify(_Tp) [with _Tp=long double]" at line 104 of "/usr/include/boost/math/special_functions/fpclassify.hpp" instantiation of "bool boost::math_detail::is_nan_helper(T, const boost::true_type &) [with T=long double]" at line 137 of "/usr/include/boost/math/special_functions/fpclassify.hpp" instantiation of "int boost::math::detail::fpclassify_imp(T, const boost::math::detail::generic_tag<true> &) [with T=long double]" at line 242 of "/usr/include/boost/math/special_functions/fpclassify.hpp" compilation aborted for main.cpp (code 2) ========== The same code compiles fine under icc 12.0. I also tried explicitly adding: #define BOOST_MATH_DISABLE_STD_FPCLASSIFY before including the header, but got the same error. The math library docs say that icc 10.0 and later are fully supported with no serious caveats, so I presume this is a bug. Should I file a ticket? Please let me know if there is any other information about my system which could be useful to know. Thanks, -Gabe

3 5

Visualizer for boost::tuple
by Mohamed Bana 05 Jan '11

05 Jan '11

Hello, I can't seem to find a visualizer for boost::tuple, does anyone have one lying around somewhere? I'm using Visual Studio 2005, if that's of any help. I appreciate the help. —Mohamed

3 2

Re: [Boost-users] Mingw64 Boost Threads Build
by Dustin T. Clifford 04 Jan '11

04 Jan '11

Jim, The build worked! It's the first successful MinGW64 build that I have had. This build was performed from within Cygwin using the mingw64 toolset. I am attempting a build with the MinGW build you pointed me to. Thank again! However, when I attempt to compile the archive into my library I get the below error. Isdmain.o:Isdmain.cpp:(.text+0x16c3): undefined reference to `boost::thread::start_thread()' Isdmain.o:Isdmain.cpp:(.text+0x9982): undefined reference to `boost::thread::~thread()' Isdmain.o:Isdmain.cpp:(.text+0x9d1a): undefined reference to `boost::thread::~thread()' Isdmain.o:Isdmain.cpp:(.text+0x9dee): undefined reference to `boost::thread::~thread()' Isdmain.o:Isdmain.cpp:(.text+0x9e65): undefined reference to `boost::thread::~thread()' Isdmain.o:Isdmain.cpp:(.text+0xbbc3): undefined reference to `boost::thread::start_thread()' Isdmain.o:Isdmain.cpp:(.text+0xbc7e): undefined reference to `boost::thread::~thread()' Isdmain.o:Isdmain.cpp:(.text+0xbc96): undefined reference to `boost::thread::~thread()' Isdmain.o:Isdmain.cpp:(.text+0xca96): undefined reference to `boost::thread::~thread()' Isdmain.o:Isdmain.cpp:(.text+0xe23a): undefined reference to `boost::thread::thread()' Isdmain.o:Isdmain.cpp:(.text+0xe252): undefined reference to `boost::thread::thread()' Isdmain.o:Isdmain.cpp:(.text+0x10): undefined reference to `boost::thread::~thread()' Isdmain.o:Isdmain.cpp:(.text+0x30): undefined reference to `boost::thread::~thread()' Isdmain.o:Isdmain.cpp:(.text$_ZN5boost6threadaSENS_6detail13thread_move_tIS0_EE[boost::thread::operator=(boost::detail::thread_move_t<boost::thread>)]+0x131): undefined reference to `boost::thread::~thread()' I have examined the library symbols and, indeed, I cannot find the appropriate externs. I jumped from 1.35.0 to 1.45.0. I was just wondering if you have any idea why this would start happening? Am I missing something? Any help would be greatly appreciated. Dustin P.S. I will let you know if this changes with the new MinGW64 build. From: Jim Bell [mailto:Jim@JC-Bell.com] Sent: Tuesday, January 04, 2011 12:04 PM To: Dustin T. Clifford Subject: Re: [Boost-users] Mingw64 Boost Threads Build I did run the regression test last night, FYI... http://www.boost.org/development/tests/trunk/developer/thread.html Last column. All tests pass but one. HTH. -Jim On 1/4/2011 10:39 AM, Dustin T. Clifford wrote: Jim, Thank you. I am going to try your patch now. I will let you know how things work out. Thanks again! Dustin From: Jim Bell [mailto:Jim@JC-Bell.com] Sent: Friday, December 31, 2010 10:35 AM To: boost-users(a)lists.boost.org<mailto:boost-users@lists.boost.org> Cc: Dustin T. Clifford Subject: Re: [Boost-users] Mingw64 Boost Threads Build I have a trunk regression-test platform that runs Mingw64 on Win7-64. It's experimental and isn't in the regression matrix right now, but works as well as any MinGW platform (or pretty close). I use GCC 4.6 from here <http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20W…><http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20W…>. CygWin's not installed on this machine. I've attached my complete set of patches. A little cryptic (and patches a pretty recent trunk revision), but should give you a set of changes that ought to get you close. You should be able to use the pre-built bjam (32-bit). <http://www.boost.org/doc/libs/1_45_0/more/getting_started/windows.html#get-…><http://www.boost.org/doc/libs/1_45_0/more/getting_started/windows.html#get-…> boostrap.bat needs a little hacking for gcc. Good luck! -Jim On 1:59 PM, Dustin T. Clifford wrote: Good Afternoon, We have been using boost-threads for our native APIs and, thus far, Boost has been a godsend! We had a recent request to build a 64-bit version of this API. To accomplish this we have attempted to build using MinGW64. Unfortunately, I have had zero luck getting boost-threads to build. I can build the 32-bit address model without a problem but 64-bit continues to elude me. I first tried Boost 1.35.0 and have now moved on to 1.45.0. I believe that the environment is set up correctly (see below). This build is being performed on a Windows 7 64-bit using MinGW64 from Cygwin. export CC=x86_64-w64-mingw32-gcc.exe export CXX=x86_64-w64-mingw32-g++.exe export LD=x86_64-w64-mingw32-ld.exe I have, also, modified my PATH to use the appropriate 64-bit bintools and aliased gcc, g++ and ld to the 64-bit MinGW64 compilers and linkers. To build Boost I have used the following with no success. boostrap.sh address-model=64 -prefix=<install> --with-libraries=thread; bjam -a install; boostrap.sh -prefix=<install> --with-libraries=thread; bjam -a address-model=64 install; boostrap.sh -prefix=<install> --with-libraries=thread; bjam -a install; The last build attempt succeeds but appears to have built 32-bit binaries. The previous two fail in building boost-threads complaining that 'address-model-64' is not found for certain build artifacts. I have, also, tried the above with a prebuilt bjam with the same results. I have tried much more than what I have cited here (including MSVC builds) with no success (some built but resulted in 32-bit binaries). I have scoured Google and found many talking about this but most either had no resolution or contained instructions that conflicted or made no sense. Does anybody have any insight into how I can produce a 64-bit boost-threads archive? Any help would be greatly appreciated. Thanks in advance, Dustin P.S. If I have missed any information or you need more (build logs are too big to attach), please, let me know.

2 3

Re: [Boost-users] [Proto] Vector Example Compilation Failure
by Hossein Haeri 04 Jan '11

04 Jan '11

Hi Erik, > This is the same problem as last time, although you would need to dig > into BOOST_PROTO_DEFINE_OPERATORS to know that. I see. Would it be too much trouble to ask for an explanation on how you got there from the compiler spew? > I don't think gcc-4.5 was available when Boost 1.42 was released, so > it's not surprising there are problems. Would it be possible for you to > use a more recent version of Boost? It would be a pain 'cause I need to port a lot of things. (Proto is not the only part of Boost that we use.) Anyhow, the bigger pain is that I have no much clue about Proto error messages and our company is committed to be a long-term user of Proto. Therefore, learning how to demystify Proto error messages is of much importance to me and I'm ready to pay the porting price if that's what it takes. :D But, seriously, have you ever thought of including a section or two on how to do that in the Proto documentation? The other (sort of related) thing is that it's come to my attention that Fusion knowledge comes very handy in Proto development. This is though not encouraged at all and I don't really think that the documentations of Fusion and Proto are that nicely tied. TIA, --Hossein

4 7

[Proto] callable_context
by Hossein Haeri 04 Jan '11

04 Jan '11

Dear all, I am trying to use callable_contexts to evaluate expressions like: x >> f >> g >> h; where this would be equivalent to h(g(f(x))). I have derived my context from callable_context, and thought I have overloaded for relevant tags (terminal and shift_right). GCC 4.5.1 (MinGW32, WinXP, SP3) stops with an error message which is cryptic to my current level of knowledge about Proto. I guess that's because I haven't done the job correctely. For your reference, I have included a copy of my program as well as the error GCC gives me in the P.S. section of this posting. Any ideas please? TIA, --Hossein P.S. <code> #include <iostream> #include <boost/proto/proto.hpp> namespace mpl = boost::mpl; namespace proto = boost::proto; using proto::_; using namespace std; struct EWGrandDad { int evaluate() const; }; typedef proto::terminal<double (*) (double)> FunctionType; template<typename> struct EmtExpr; struct EmtGrammar: proto::or_ < proto::terminal<EWGrandDad>, proto::shift_right<EmtGrammar, FunctionType> > {}; struct EmtDomain: proto::domain<proto::generator<EmtExpr>, EmtGrammar> {}; template<typename Expr> struct EmtExpr : proto::extends<Expr, EmtExpr<Expr>, EmtDomain> { typedef proto::extends<Expr, EmtExpr<Expr>, EmtDomain> base_type; EmtExpr(const Expr& e = Expr()): base_type(e) {} }; struct EWBase : EmtExpr<typename proto::terminal<EWGrandDad>::type> { typedef typename proto::terminal<EWGrandDad>::type expr_type; EWBase(): EmtExpr<expr_type>(expr_type::make(EWGrandDad())) {} }; struct EW1: EWBase { EW1(int n1, int n2): n1_(n1), n2_(n2) {} int evaluate() const {return n1_ * n2_;} int n1_, n2_; }; double times2(double d) {return d * 2;} double minus1(double d) {return d - 1;} struct EmtContext: proto::callable_context<const EmtContext> { typedef double result_type; result_type operator() (proto::tag::terminal, const EWGrandDad& ew) const { return ew.evaluate(); } template<typename Expr> result_type operator() (proto::tag::shift_right, const Expr& e, FunctionType f) const { return f(proto::eval(e, *this)); } }; int main() { EmtContext emtCtx; cout << "result = " << emtCtx(EW1(4, 5) >> &times2 >> &minus1); return 0; } </code> <error message> main.cpp: In function 'int main()': main.cpp:82:63: error: no match for call to '(EmtContext) (const boost::lazy_enable_if_c<true, boost::proto::generatorns_::generator<EmtExpr>::result<EmtDomain(boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const EmtExpr<boost::proto::exprns_::expr<boost::proto::tag::shift_right, boost::proto::argsns_::list2<const EW1&, EmtExpr<boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> > >, 2l> >&, EmtExpr<boost::proto::exprns_::expr<boost::proto::tag::terminal, boost::proto::argsns_::term<double (* const&)(double)>, 0l> > >, 2l>)> >::type)' main.cpp:67:14: note: candidate is: EmtContext::result_type EmtContext::operator()(boost::proto::tag::terminal, const EWGrandDad&) const </error message>

3 7

Mingw64 Boost Threads Build
by Dustin T. Clifford 04 Jan '11

04 Jan '11

Good Afternoon, We have been using boost-threads for our native APIs and, thus far, Boost has been a godsend! We had a recent request to build a 64-bit version of this API. To accomplish this we have attempted to build using MinGW64. Unfortunately, I have had zero luck getting boost-threads to build. I can build the 32-bit address model without a problem but 64-bit continues to elude me. I first tried Boost 1.35.0 and have now moved on to 1.45.0. I believe that the environment is set up correctly (see below). This build is being performed on a Windows 7 64-bit using MinGW64 from Cygwin. export CC=x86_64-w64-mingw32-gcc.exe export CXX=x86_64-w64-mingw32-g++.exe export LD=x86_64-w64-mingw32-ld.exe I have, also, modified my PATH to use the appropriate 64-bit bintools and aliased gcc, g++ and ld to the 64-bit MinGW64 compilers and linkers. To build Boost I have used the following with no success. boostrap.sh address-model=64 -prefix=<install> --with-libraries=thread; bjam -a install; boostrap.sh -prefix=<install> --with-libraries=thread; bjam -a address-model=64 install; boostrap.sh -prefix=<install> --with-libraries=thread; bjam -a install; The last build attempt succeeds but appears to have built 32-bit binaries. The previous two fail in building boost-threads complaining that 'address-model-64' is not found for certain build artifacts. I have, also, tried the above with a prebuilt bjam with the same results. I have tried much more than what I have cited here (including MSVC builds) with no success (some built but resulted in 32-bit binaries). I have scoured Google and found many talking about this but most either had no resolution or contained instructions that conflicted or made no sense. Does anybody have any insight into how I can produce a 64-bit boost-threads archive? Any help would be greatly appreciated. Thanks in advance, Dustin P.S. If I have missed any information or you need more (build logs are too big to attach), please, let me know.

3 4

filesystem3 with qt at windows
by Eirik Haaversen 04 Jan '11

04 Jan '11

Hi all, I'm trying to build the tut2 example in boost version 1.44 using qt's build system (.pro) file. I get the following error when I run nmake after qmake: Microsoft (R) Program Maintenance Utility Version 9.00.21022.08 Copyright (C) Microsoft Corporation. All rights reserved. e:\terratec\projects\common\Qt\4.6.3\bin\qmake.exe -win32 -o Makefile fr edag.pro e:\terratec\projects\common\MicrosoftVisualStudio9.0\VC\BIN\nmake.exe -f Makefile.Debug Microsoft (R) Program Maintenance Utility Version 9.00.21022.08 Copyright (C) Microsoft Corporation. All rights reserved. link /LIBPATH:"e:\terratec\projects\common\Qt\4.6.3\lib" /NOLOGO /DEBUG /SUBSYSTEM:CONSOLE /MANIFEST /MANIFESTFILE:"debug\fredag.intermediate.manifest" /OUT:debug\fredag.exe @C:\DOCUME~1\builder\LOCALS~1\Temp\nmEB2.tmp fredag.obj : error LNK2019: unresolved external symbol "private: static class st d::codecvt<unsigned short,char,int> const * & __cdecl boost::filesystem3::path:: wchar_t_codecvt_facet(void)" (?wchar_t_codecvt_facet@path@filesystem3@boost@@CAA APBV?$codecvt@GDH@std@@XZ) referenced in function "public: static class std::cod ecvt<unsigned short,char,int> const & __cdecl boost::filesystem3::path::codecvt( void)" (?codecvt@path@filesystem3@boost@@SAABV?$codecvt@GDH@std@@XZ) fredag.obj : error LNK2019: unresolved external symbol "void __cdecl boost::file system3::path_traits::convert(unsigned short const *,unsigned short const *,clas s std::basic_string<char,struct std::char_traits<char>,class std::allocator<char > > &,class std::codecvt<unsigned short,char,int> const &)" (?convert@path_trait s@filesystem3@boost@@YAXPBG0AAV?$basic_string@DU?$char_traits@D@std@@V?$allocato r@D@2@@std@@ABV?$codecvt@GDH@5@@Z) referenced in function "public: class std::ba sic_string<char,struct std::char_traits<char>,class std::allocator<char> > const __thiscall boost::filesystem3::path::string(class std::codecvt<unsigned short,c har,int> const &)const " (?string@path@filesystem3@boost@@QBE?BV?$basic_string@D U?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV?$codecvt@GDH@5@@Z) fredag.obj : error LNK2019: unresolved external symbol "void __cdecl boost::file system3::path_traits::convert(char const *,char const *,class std::basic_string< unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsi gned short> > &,class std::codecvt<unsigned short,char,int> const &)" (?convert@ path_traits@filesystem3@boost@@YAXPBD0AAV?$basic_string@GU?$char_traits@G@std@@V ?$allocator@G@2@@std@@ABV?$codecvt@GDH@5@@Z) referenced in function "void __cdec l boost::filesystem3::path_traits::convert(char const *,class std::basic_string< unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsi gned short> > &,class std::codecvt<unsigned short,char,int> const &)" (?convert@ path_traits@filesystem3@boost@@YAXPBDAAV?$basic_string@GU?$char_traits@G@std@@V? $allocator@G@2@@std@@ABV?$codecvt@GDH@5@@Z) debug\fredag.exe : fatal error LNK1120: 3 unresolved externals NMAKE : fatal error U1077: 'e:\terratec\projects\common\MicrosoftVisualStudio9.0 \VC\BIN\link.EXE' : return code '0x460' Stop. NMAKE : fatal error U1077: 'e:\terratec\projects\common\MicrosoftVisualStudio9.0 \VC\BIN\nmake.exe' : return code '0x2' Stop. It builds fine on Linux and Mac. I appreciate all hints. BR. Eirik

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Improving extern template usage
by Jens Auer 04 Jan '11

04 Jan '11

Hi, I've been playing around with the extern template implementation of Visual C++ (2005 and 2010) to reduce our overly long build times. Microsoft's implementation does only omit implicit definitions for member functions not defined inline in the class body. This makes the feature rather useless to reduce build times, as most functions in the boost library (and Microsoft's STL) seem to be declared inline and get implicitly instantiated every time, thus forcing the linker to remove them which is quite costly. This behavior is also perfectly valid with the standard where an exception is made for member functions of template classes defined inline. Would it be reasonable to change the coding guidelines to only define trivial member functions in the class body and provide the definitions separatly after the class declaration? I think gcc does implicitly sinatntiate these member functions, but the MS compilers are widely used and a large number of users would benefit.

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