January 2011 - Boost-users - lists.preview.boost.org

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

1 0

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.

1 0

enable_if: fusion seq, vs2010 vs gcc
by Hicham Mouline 04 Jan '11

04 Jan '11

#include <iostream> #include <boost/utility/enable_if.hpp> #include <boost/fusion/include/is_sequence.hpp> struct S { double skid; }; template<typename Archive> void serialize(Archive& ar, S& sp, unsigned int) { std::cout<<"1st one"<<std::endl; } template <typename Archive, typename Seq> typename boost::enable_if_c<boost::fusion::traits::is_sequence<Seq>::value, void>::type serialize( Archive& ar, Seq& seq, unsigned int) { std::cout<<"2nd one"<<std::endl; } template void serialize<double>(double&, S&, unsigned int); int main() { S s; double d1=5.; serialize(d1, s, 5); return 0; } The above code compiles ok on gcc4.5.1 and prints 1st one. It crashes vs2008. vs2010 was fixed not to crash but fails to compile according to those who have vs2010. Is this correct code (I guess I mean standard conforming)? regards,

1 0

[units] subtract_typeof_helper<> help!
by Terry Golubiewski 04 Jan '11

04 Jan '11

I'm trying to use boost::geometry and boost::units together. For some reason boost::geometry doesn't represent the difference of two points as vectors. So, I'm making my own Vector class and defining Vector = Point - Point. The sample program below doesn't compile because I need to tell the units library about the special properties of point subtraction (I think). terry #include <boost/geometry/geometry.hpp> #include <boost/units/systems/si.hpp> #include <boost/units/quantity.hpp> #include <boost/units/io.hpp> #include <iostream> #include <iomanip> using namespace std; using namespace boost; using namespace boost::geometry; using namespace boost::units; typedef point<double, 3, cs::cartesian> Point; class Vector { Point _impl; friend Vector operator-(const Point& lhs, const Point& rhs); explicit Vector(Point p) : _impl(p) { } public: Vector() : _impl(0) { } Vector(double dx, double dy, double dz=0) : _impl(dx, dy, dz) { } friend ostream& operator<<(ostream& os, const Vector& v) { return os << dsv(v._impl); } }; // Vector inline Vector operator-(const Point& lhs, const Point& rhs) { Point tmp(lhs); subtract_point(tmp, rhs); return Vector(tmp); } inline ostream& operator<<(ostream& os, const Point& pt) { return os << dsv(pt); } int main() { Point p1(1, 2, 3); Point p2(4, 5, 6); typedef quantity<si::length, Point> Position; typedef quantity<si::length, Vector> Displacement; Position start( p1 * si::meters); Position finish(p2 * si::meters); Displacement disp(finish - start); cout << "disp=" << disp << endl; return EXIT_SUCCESS; } // main

7 16

[Proto] EvalStream Revisited -- Segmentation Fault
by Hossein Haeri 04 Jan '11

04 Jan '11

Dear all, A few weeks ago, I asked for help about an EDSL which can handle expressions like x >> f >> g >> h so that they're equivalent to h(g(f(x))) once evaluated. Eric kindly provided me with the solution in the P.S. I was just playing around with his code and thought about extending it with a simple case when f's and g's are actually functions, as opposed to function objects. So, I added the following two lines: int plus1(int i) {return i + 1;} const terminal<pointer_to_unary_function<int, int> >::type plus_one = {ptr_fun(&plus1)}; And, I get a segmentation fault (GCC 4.5.1, MinGW32, WinXP, SP3) when I run the following line: 1 >> plus_one >> plus_one Any ideas? TIA, --Hossein P.S. #include <boost/proto/proto.hpp> #include <iostream> namespace proto = boost::proto; using proto::_; struct add_one_ { typedef int result_type; int operator()(int i) const { return i + 1; } }; proto::terminal<add_one_>::type const add_one = {}; struct GetFun : proto::call<proto::_value(proto::_right)> {}; struct EvalStream : proto::or_< proto::when< proto::terminal<_> , proto::_value > , proto::when< proto::shift_right<EvalStream, proto::terminal<_> > , proto::lazy< GetFun(EvalStream(proto::_left)) > > > {}; int main() { // This prints "3" std::cout << EvalStream()( 1 >> add_one >> add_one ) << std::endl; }

1 0

[units] Automatic Physical Units in Mathematica and Boost.Units
by alfC 03 Jan '11

03 Jan '11

Since there are not many computer software that handles units seriously, except possibly for Boost.Units and Mathematica`Units in my opinion, I just wanted to point out to this post: Automatic Physical Units in Mathematica http://blog.wolfram.com/2010/12/09/automatic-physical-units-in-mathematica/ Interesting discussion in terms of features. One of the reasons I hated Mathematica units handling so far was due to the lack of a typing system which C++ and boost.Units have naturally, the other reason was that the physical quantites didn't seem to play well with other parts of the system. Now it seems that Mathematica Units is discovering "types". One of the features that it mentions is the ability to perform automatic conversions upon arithmetic operations of mixed units. In fact I was working in a way to perform automatic conversion in Boost.Units inside arithmetic formulas, since Mathematica has unbounded precision arithmetic by default the automatic conversions are not a real problem. An exact matching of this feature can not be achieved with a limited precision representation (like double). I'll take the opportunity ask two broad general questions: Does any body have experience with using boost.units quantity with a underlying type that are not double, e.g. multiple precision, or vector (geometric) objects? Does it work well? Are there future planned developments for Boost.Units, in terms of external features (e.g. automatic conversion, better interaction with boost.phoenix) or internal implementation? Thank you, Alfredo

5 7