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Building boost with stlport?
by Robert Dailey 10 Oct '11

10 Oct '11

Hello, I was searching around Google for this but I wasn't able to find any documentation. Is there a way to reliably build the latest version of Boost using STLport on Windows instead of letting boost use Microsoft's STL implementation? Thanks in advance. --------- Robert Dailey

2 4

Variant stream output of ICU UnicodeString
by André 10 Oct '11

10 Oct '11

Hi, I'm trying to stream a Boost::Variant with << to std::cout but when I include an UnicodeString member from the ICU Unicode library the compiler doesn't recognices my overloaded operator<< for the UnicodeString. Here is a test program: #include <iostream> #include <unicode/unistr.h> #include <boost/variant.hpp> class Foo {}; std::ostream& operator<<(std::ostream& stream, Foo const &b) { return stream << "Foo"; } std::ostream& operator<<(std::ostream& stream, UnicodeString const & unicode) { return stream << "Unicode"; } int main() { boost::variant<Foo, UnicodeString, int, double> test; test = Foo(); std::cout << test << std::endl; test = "Hello World"; std::cout << test << std::endl; return 0; } Without the UnicodeString code everything works find but with it I get the following errors: g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/TestUnicode.d" -MT"src/TestUnicode.d" -o "src/TestUnicode.o" "../src/TestUnicode.cpp" In file included from /usr/include/boost/variant/variant.hpp:1859, from /usr/include/boost/variant.hpp:17, from ../src/TestUnicode.cpp:11: /usr/include/boost/variant/detail/variant_io.hpp: In member function ‘void boost::detail::variant::printer<OStream>::operator()(const T&) const [with T = icu_4_2::UnicodeString, OStream = std::basic_ostream<char, std::char_traits<char> >]’: /usr/include/boost/variant/variant.hpp:825: instantiated from ‘typename Visitor::result_type boost::detail::variant::invoke_visitor<Visitor>::internal_visit(T&, int) [with T = const icu_4_2::UnicodeString, Visitor = boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > >]’ /usr/include/boost/variant/detail/visitation_impl.hpp:126: instantiated from ‘typename Visitor::result_type boost::detail::variant::visitation_impl_invoke_impl(int, Visitor&, VoidPtrCV, T*, mpl_::true_) [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, T = boost::detail::variant::visitation_impl(int, int, Visitor&, VoidPtrCV, mpl_::false_, NoBackupFlag, Which*, step0*) [with Which = boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::internal_apply_visitor_impl(int, int, Visitor&, VoidPtrCV) [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, T0_ = Foo, T1 = icu_4_2::UnicodeString, T2 = int, T3 = double, T4 = boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 = boost::detail::variant::void_]::first_which, step0 = boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::internal_apply_visitor_impl(int, int, Visitor&, VoidPtrCV) [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, T0_ = Foo, T1 = icu_4_2::UnicodeString, T2 = int, T3 = double, T4 = boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 = boost::detail::variant::void_]::first_step, Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, NoBackupFlag = boost::variant<Foo, icu_4_2::UnicodeString, int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_]::T1]’ /usr/include/boost/variant/detail/visitation_impl.hpp:169: instantiated from ‘typename Visitor::result_type boost::detail::variant::visitation_impl_invoke(int, Visitor&, VoidPtrCV, T*, NoBackupFlag, int) [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, T = boost::detail::variant::visitation_impl(int, int, Visitor&, VoidPtrCV, mpl_::false_, NoBackupFlag, Which*, step0*) [with Which = boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::internal_apply_visitor_impl(int, int, Visitor&, VoidPtrCV) [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, T0_ = Foo, T1 = icu_4_2::UnicodeString, T2 = int, T3 = double, T4 = boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 = boost::detail::variant::void_]::first_which, step0 = boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::internal_apply_visitor_impl(int, int, Visitor&, VoidPtrCV) [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, T0_ = Foo, T1 = icu_4_2::UnicodeString, T2 = int, T3 = double, T4 = boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 = boost::detail::variant::void_]::first_step, Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, NoBackupFlag = boost::variant<Foo, icu_4_2::UnicodeString, int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_]::T1, NoBackupFlag = boost::variant<Foo, icu_4_2::UnicodeString, int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_]’ /usr/include/boost/variant/detail/visitation_impl.hpp:256: instantiated from ‘typename Visitor::result_type boost::detail::variant::visitation_impl(int, int, Visitor&, VoidPtrCV, mpl_::false_, NoBackupFlag, Which*, step0*) [with Which = boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::internal_apply_visitor_impl(int, int, Visitor&, VoidPtrCV) [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, T0_ = Foo, T1 = icu_4_2::UnicodeString, T2 = int, T3 = double, T4 = boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 = boost::detail::variant::void_]::first_which, step0 = boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::internal_apply_visitor_impl(int, int, Visitor&, VoidPtrCV) [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, T0_ = Foo, T1 = icu_4_2::UnicodeString, T2 = int, T3 = double, T4 = boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 = boost::detail::variant::void_]::first_step, Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, NoBackupFlag = boost::variant<Foo, icu_4_2::UnicodeString, int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_]’ /usr/include/boost/variant/variant.hpp:1769: instantiated from ‘static typename Visitor::result_type boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::internal_apply_visitor_impl(int, int, Visitor&, VoidPtrCV) [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, VoidPtrCV = const void*, T0_ = Foo, T1 = icu_4_2::UnicodeString, T2 = int, T3 = double, T4 = boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 = boost::detail::variant::void_]’ /usr/include/boost/variant/variant.hpp:1791: instantiated from ‘typename Visitor::result_type boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::internal_apply_visitor(Visitor&) const [with Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > > >, T0_ = Foo, T1 = icu_4_2::UnicodeString, T2 = int, T3 = double, T4 = boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 = boost::detail::variant::void_]’ /usr/include/boost/variant/variant.hpp:1813: instantiated from ‘typename Visitor::result_type boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::apply_visitor(Visitor&) const [with Visitor = boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > >, T0_ = Foo, T1 = icu_4_2::UnicodeString, T2 = int, T3 = double, T4 = boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 = boost::detail::variant::void_]’ /usr/include/boost/variant/detail/variant_io.hpp:85: instantiated from ‘std::basic_ostream<_CharT, _Traits>& boost::operator<<(std::basic_ostream<_CharT, _Traits>&, const boost::variant<U0, U1, U2, U3, U4, U5, U6, U7, U8, U9, U10, U11, U12, U13, U14, U15, U16, U17, U18, U19>&) [with E = char, T = std::char_traits<char>, U0 = Foo, U1 = icu_4_2::UnicodeString, U2 = int, U3 = double, U4 = boost::detail::variant::void_, U5 = boost::detail::variant::void_, U6 = boost::detail::variant::void_, U7 = boost::detail::variant::void_, U8 = boost::detail::variant::void_, U9 = boost::detail::variant::void_, U10 = boost::detail::variant::void_, U11 = boost::detail::variant::void_, U12 = boost::detail::variant::void_, U13 = boost::detail::variant::void_, U14 = boost::detail::variant::void_, U15 = boost::detail::variant::void_, U16 = boost::detail::variant::void_, U17 = boost::detail::variant::void_, U18 = boost::detail::variant::void_, U19 = boost::detail::variant::void_]’ ../src/TestUnicode.cpp:27: instantiated from here /usr/include/boost/variant/detail/variant_io.hpp:64: error: no match for ‘operator<<’ in ‘((const boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > >*)this)->boost::detail::variant::printer<std::basic_ostream<char, std::char_traits<char> > >::out_ << operand’ /usr/include/c++/4.4/ostream:108: note: candidates are: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>& (*)(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:117: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:127: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:165: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:169: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:173: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/bits/ostream.tcc:91: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:180: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/bits/ostream.tcc:105: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:191: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:200: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:204: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:209: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:213: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:221: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/ostream:225: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/bits/ostream.tcc:119: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>] I'm using gcc 4.4.5 on Ubuntu 11.04 and boost 1.42. Does someone know why the overloaded operator isn't used or how I can get the test program to work?

3 4

boost multithread deisign for large and fast data exchange
by Jack Bryan 10 Oct '11

10 Oct '11

Hi, I am doing C++ multithreaded coding on Linux. Each thread hold some messagers, who need to talk (exchange message) to other messagers. Each messager is not only a message pruducer but also a message consumer. If a messager needs to talk to another messager and both of them are held by the same thread , that is intra-hread talk. Otherwise, it is inter-thread talk. A messager can generate multiple messages, each of which has a distinct message-receiver ID. Each messager needs to do some computing tasks in order to produce a message. Only the messager with match ID can receive and consume the message. All messagers work asynchronously and the message exchange (like a multicast) pairs are fixed and do not change in the whole process of the program. In order to simulate the above message exchange, I want to associate a priority message queue with each thread such that (1) Each messager in a priority queue is an element. Whenever a messager's computing task is done and its message is ready for sending out, it has the highest priority and it is poped out and saved in a map with the messager's receiver ID as key. (2) Then, the messager is push backed to the queue again and wait for receiving messgae from its talk pairs and do the above step (1). (3) each thread is associated with a queue like this. Sometimes, do inter-thread talk and some times do intra-thread talk. My questions: How to efficiently implement the above idea with boost data containers, thread, thread pool, boost algorithm or other boost components ? Are there other better ways to simulate the talk ? Any help, advice or idea is really appreciated. Thanks

2 1

how to free thread object
by davieyan 10 Oct '11

10 Oct '11

Hi, I write code to start a thread,but how to free this thread. code: void helloworld() { std::cout << "Hello World!" << std::endl; } int main() { boost::thread thrd(&helloworld); thrd.join(); } -- View this message in context: http://boost.2283326.n4.nabble.com/how-to-free-thread-object-tp3888900p3888… Sent from the Boost - Users mailing list archive at Nabble.com.

3 2

[graph] [beginner] How to use the "tie(...) feature" with standard c++ containers?
by Christoph 10 Oct '11

10 Oct '11

Hi recently i started programming with the boost graph library. You can use nice syntax for iterating over a set of vertices or edges by writing for example: //begin program #include <iostream> #include <boost/graph/adjacency_list.hpp> typedef boost::adjacency_list < boost::listS, boost::vecS, boost::bidirectionalS> my_graph; typedef boost::graph_traits <my_graph> my_graph_traits; int main() { my_graph g(5); my_graph_traits::vertex_iterator vi, vi_end; for (boost::tie (vi, vi_end) = vertices (g); vi != vi_end; ++vi) { std::cout << "vertex: " << *vi << std::endl; } } //End program Outputs: vertex: 0 vertex: 1 vertex: 2 vertex: 3 vertex: 4 My question is now how to define functions 'tie(...)' and 'elements(...)' for using them with standard containers. Suppose you have a container like the list: std::list <unsigned int> list(4); Now to iterate over all elements i would like to write something like //begin snippet std::list <unsigned int>::iterator begin, end; for (tie (begin, end) = elements (list); begin != end; ++begin) ;// do some thing //end snippet In stead of writing: //begin snippet begin = list.begin(); end = list.end(); for (; begin != end; ++begin) ;// do some thing //end snippet I started defining the function elements(...) like this: template <typename T> std::pair < typename T::iterator, typename T::iterator> elements (T container) { return std::make_pair(container.begin(), container.end()); } The compiler tells me, that 'tie' was not declared in this scope. So i assume that i also have to define the 'tie' function in some way. Maybe there is already some functionality to access the standard containers the way you can do it with 'tie' or maybe you could give me some hint to solve the problem. best regards Christoph

3 5

Is boost graph library match my needs?
by ohad barta 09 Oct '11

09 Oct '11

Hi I am a Technion's reserch assistant , and right now Im looking for a graph library. The main use that I'm gonna do with graphs is routing (I am gonna use disjoint paths on a graphs, probably de bruijn graphs, in order to express some permutation). Do you think that using the BGL will be efficient in that case? Thanks in advance Ohad

1 0

[regex] expression: string iterator not dereferencable
by Mitin Slava 09 Oct '11

09 Oct '11

Good day. I use boost::regex with ICU. When I try call u32regex_match for symbol with code 0xDA10, I get an expression "string iterator not dereferencable (xstring, line 112)". If I use other symbol (for example, "X") it works correctly. If I use wregex (wighout ICU) it works correctly too. What could be the problem? The code: #include "stdafx.h" #include <iostream> #include <conio.h> #include <boost/regex.hpp> #include <boost/regex/icu.hpp> int _tmain(int argc, _TCHAR* argv[]) { boost::u32regex delimiterRegex = boost::make_u32regex(L"\\W <file:///\\W> "); std::wstring symbol = L"X"; symbol[0] = wchar_t(0xDA10); // <= for this symbol if (boost::u32regex_match(symbol, delimiterRegex)) // <= assertion here std::cout << "success" << std::endl; else std::cout << "not match\n"; _getch(); return 0; } I checked it for boost_1_47_0. MSVC 2008 compiler. Thank you in advance, Slava Mitin

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[serialization] problem with free funciton splitting
by Jonathan 09 Oct '11

09 Oct '11

Hi, i have a code like this: //LightSetup template<class Archive> void save(Archive &a, const Mrl::LightSetup& LightSetup, unsigned int version) { unsigned int Count=LightSetup.NumLights(); a & serialization::make_nvp("Count", Count); for(unsigned int i=0; i<Count; ++i) { a & serialization::make_nvp("Light", LightSetup[i]); } } template<class Archive> void load(Archive &a, Mrl::LightSetup& LightSetup, unsigned int version) { unsigned int Count; a & serialization::make_nvp("Count", Count); LightSetup=Mrl::LightSetup();//clear everything for(unsigned int i=0; i<Count; ++i) { Light* NewLight=0; a & serialization::make_nvp("Light", NewLight): LightSetup.Add(Light); } } namespace boost { namespace serialization { template<class Archive> inline void serialize( Archive & ar, Mrl::LightSetup & t, const unsigned int file_version ){ split_free(ar, t, file_version); } }} //BOOST_SERIALIZATION_SPLIT_FREE(Mrl::LightSetup) (I tried both version, the makro and the serialize implementations, both give me the same error). The compiler says: boost\boost/serialization/split_free.hpp(45): error C2664: 'boost::serialization::save': Konvertierung des Parameters 2 von 'const Mrl::LightSetup' in 'const boost_132::detail::shared_count &' nicht möglich (converting parameter 2 not possible). I have no idea what this shared_count is, so I don't know, what do do. King regards Jonathan Klein

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[Boost Test Library] Dead links in documentation
by Boost lzw 09 Oct '11

09 Oct '11

Hello, I am reading the document from the following link: http://www.boost.org/doc/libs/1_47_0/libs/test/doc/html/tutorials/new-year-… and encountered two dead links ("Listing1", "Listing2") in the second-to-last paragraph. Are they intentionally removed? I hope I can read these listings to fullly appreciate the test library in Boost. Thanks. Robert

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a tuple from a pair?
by Krzysztof Żelechowski 07 Oct '11

07 Oct '11

How come a tuple, being a generalisation of a pair, cannot be constructed from one? I mean something along the lines make_tuple (pair const &p) { return make_tuple (p.first, p_second); } Would be good to have.

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