December 2006 - Boost-users

[tuple] extend to more than 10 elements
by Gabriel Ki 11 Dec '06

11 Dec '06

Hi, Has anyone successfully extended tuple to contain more than 10 elements? Any pointer to do that would be appreciated. I found the combination of Loki and boost tuple is very amazing. I would love to match up their capacity. Thanks for the great library. Regards, Gabriel Ki ____________________________________________________________________________________ Any questions? Get answers on any topic at www.Answers.yahoo.com. Try it now.

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using the fusion library
by craigp 11 Dec '06

11 Dec '06

i've been looking at the fusion library for a few days now, and i feel like i'm missing something (or just trying to make this fit for a use-case it's simply not suited for). i'm looking as using it for compile-time introspection for, let's say, serialization. one thing i was curious about was whether i can statically map each of my persistent types to a string (which could be used as the name of an xml element/attribute). i quickly determined that a map (of fusion-pairs) with more than just a few elements quickly overwhelms the compiler (msvc 7.1; raising the limit of 20 to ~50 just makes the compiler barf). any thoughts on this? fusion provides what appears to be a lot of infrastructure, but i can't seem to take advantage of most of it ('out of the box', anyway). the best i've come up with so far is to create a for_each_it algorithm which, instead of calling back the visitor function with the value, calls it back with the corresponding iterator instead. this seems to work ok, but it appears i'd need to hand-write each algorithm (as well as each sequence), and i don't think that's how it was intended to be used. ;-) any thoughts? am i just barking up the wrong tree? what kinds of applications/use-cases were in mind when fusion was designed? most things i've thought of would (i'd guess) be impractical with today's compilers. i think there's some connection with fusion and spirit... how does spirit avoid the compiler limits i seem to run into? thanks! --craig __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Get Your BoostCon Session Proposals In!
by David Abrahams 11 Dec '06

11 Dec '06

In case you hadn't heard... The inaugural Boost conference takes place in Aspen, Colorado May 14-18, 2007! BoostCon 2007 will be hosted at Aspen Center for Physics, one of the most beautiful meeting sites in the world, and a great venue for collaboration and discovery. We've already developed an exciting lineup of speakers and topics with such notables as Sean Parent of Adobe and Scott Meyers on the agenda. Still, we'd like to bring in a broader range of ideas from the community, so we're extending the deadline for session proposals through Monday, December 17th. We're especially interested in seeing proposals from Boost library authors for tutorial sessions on their libraries. We'd also like to see proposals for experience reports from the user community. That said, don't limit yourself: there are more ideas on the session proposal page, and as it says there, "don't hold back a proposal just because it doesn't fit into a pigeonhole." Call for sessions: http://www.boost.org/more/BoostCon07_session_call.html Submit session proposals to the program committee at: boostcon-program(a)lists.boost-consulting.com See you in May! -- Dave Abrahams Boost Consulting www.boost-consulting.com

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Is Boost Threads missing "pthread_cancel"-like Functionality?
by Offlein 11 Dec '06

11 Dec '06

Hi all, i'm missing something like PThread's pthread_cancel. Is there a Way to use Boost::Threads in a similar Way. I looked in the Docu and didn't find anything similar to pthread_cancel. Is there another Functionality which kind of "implement" this Behaviour of PThreads or am i blind and don't see where it's written in the Docu? I don't want to use anything else because Boost is a very good Collection of Libraries, which are very well written.

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#include <boost/lambda/lambda.hpp>
by Andreas Wißmeier 11 Dec '06

11 Dec '06

Dear all, if I include this file I get the following error-message: d:\cvsatSixt\sixt_offer_src\boost\boost\lambda\detail\arity_code.hpp(66): error C2065: 'T' : undeclared identifier I am using Microsoft Visual C++ .NET version 1.0.3705 I am probably missing something very basic. Kind regards Andreas

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boost function with lambda bind
by Santosh Joseph 11 Dec '06

11 Dec '06

I'm trying to use a boost function object within a lambda bind. This is my test program and the commented line does not compile. What i'm trying to do is iterate over a container of test_str structs which has one data member (a string) and get that string and insert that string into another string. #include <string> #include <set> #include <vector> #include <iostream> #include "boost/lambda/lambda.hpp" #include "boost/lambda/bind.hpp" #include <algorithm> #include "boost/function.hpp" using namespace std; struct test_str { test_str(string s): str(s){} string str; }; int main(int argc, char* argv[]) { using namespace boost::lambda; boost::lambda::placeholder1_type Arg; typedef pair<set<string>::iterator,bool> (set<string>::*INSERT)(const string&); set<string> str_con; INSERT insert_func = &set<string>::insert; vector<test_str> v2; v2.push_back( test_str("one") ); v2.push_back( test_str("two") ); boost::function<string&(test_str&)> f = bind(&test_str::str, Arg); //for_each( v2.begin(), v2.end(), bind( insert_func, var(str_con), var(f))); for_each( v2.begin(), v2.end(), bind( insert_func, var(str_con), bind(&test_str::str, Arg))); return 0; } This is part of the error message i get from a vs2003.net compiler. Any help would be appreciated. c:\santosh\tools\boost_1_33_1\boost\lambda\detail\function_adaptors.hpp(250): error C2664: 'std::pair<_Ty1,_Ty2> (Arg1)' : cannot convert parameter 1 from 'boost::function<Signature>' to 'const std::basic_string<_Elem,_Traits,_Ax> ' with [ _Ty1=std::_Tree<std::_Tset_traits<std::string,std::less<std::string>,std::allocator<std::string>,false>>::iterator, _Ty2=bool, Arg1=const std::string & ] and [ Signature=std::string &(test_str &) ] and [ _Elem=char, _Traits=std::char_traits<char>, _Ax=std::allocator<char> ] __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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boost::array as part of container.
by chun ping wang 11 Dec '06

11 Dec '06

hi i would like to know how to insert boost::array into containers such as vectors, list, etc, in an effective and easy way.. tuples don't work cause you can't get to random access index. Thanks. AES word example. typedef boost::array<int, 4> word; std::vector vecOfWord; // perform some word insertion.

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Serialization/cvs can not serialize vector<bool>
by Bo Peng 11 Dec '06

11 Dec '06

Dear boost users, To test Boost.MPI, I upgrade from boost 1.33.1 to boost/cvs. I get error messages like: /usr/include/boost-1_35/boost/archive/detail/oserializer.hpp:151: instantiated from `void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::binary_oarchive, T = simuPOP::population]' /home/bpeng/simuPOP/release/build/population_ba.cpp:1567: instantiated from here /usr/include/boost-1_35/boost/serialization/detail/get_data.hpp:31: warning: taking address of temporary /usr/include/boost-1_35/boost/serialization/detail/get_data.hpp:31: error: cannot convert `std::_Bit_reference*' to `bool*' in return which looks like the old vector<bool>::reference problem. Is this a known problem? Does anyone know a solution? Many thanks in advance. Bo

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Problem with multi_index
by Sunil Chomal 11 Dec '06

11 Dec '06

Dear All, I am a newbie with multi_index container. I need to store the following data structure in the multi_index_container: ************************************* #if !defined(NDEBUG) #define BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING #define BOOST_MULTI_INDEX_ENABLE_SAFE_MODE #endif #include <boost/multi_index_container.hpp> #include <boost/multi_index/member.hpp> #include <boost/multi_index/ordered_index.hpp> #include <algorithm> #include <iostream> #include <iterator> #include <string> using boost::multi_index_container; using namespace boost::multi_index; struct base { int base_data; }; struct child : public base { int child_data; }; struct base_data{ }; typedef multi_index_container < child, indexed_by< ordered_non_unique< tag<base_data>, BOOST_MULTI_INDEX_MEMBER(child, int, base_data) > > > child_set; int main() { child_set cs; return 0; } *************************************** If i try and compile the above code, I get the following error test.cpp:33: error: could not convert template argument &base::base_data to int child::* test.cpp:33: error: template argument 2 is invalid test.cpp:34: error: template argument 1 is invalid test.cpp:35: error: template argument 2 is invalid test.cpp:35: error: invalid type in declaration before ; token I have looked up the examples, but I can find any example for structs which are inherited. Can someone help? Regards, Sunil

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Re: [Boost-users] Issue linking to static boost thread library (Newbie)
by Nat Goodspeed 11 Dec '06

11 Dec '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org [mailto:boost-users- > bounces(a)lists.boost.org] On Behalf Of Forever Kid > Sent: Monday, December 11, 2006 12:54 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] Issue linking to static boost thread library > (Newbie) > > I am having a little trouble getting boost to load the > static thread library. > > For some reason it wants to load the dynamic library > instead of the static boost_thread library. [Nat] I don't know if this is still applicable, but have you tried BOOST_THREAD_USE_LIB? This is the most pertinent message I've turned up: http://archives.free.net.ph/message/20040629.155158.2084b216.en.html

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