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

Sequence modifying routines??
by John Femiani 01 Dec '07

01 Dec '07

Is there a reason that fusion seems devoid of sequence modifying routines except for the built-in assignment operators? For instance, if I wanted to operate on boost::array, I would seem to have no way to write the results back into an array through fusion (unless I miss something). I am looking for something like copy(input_sequence, output_sequence) -- John Femiani

1 0

BGL : maximum weighted matching
by Alessio Dore 01 Dec '07

01 Dec '07

Dear all, I am implementing an algorithm for which I would need to compute the maximum weighted matching of a bipartite graphs. I have seen that LEDA libraries has this sort of functions but their license is restrictive. BGL allows maximum cardinality matching but, if I understood well, it works for non-weighted graphs. In a previous message on this list it was mentioned that this functionality could have been added but I didn't find it. Is it available? Does anyone of you know if there are other libraries to perform it? Thanks. Regrads, Alessio

2 1

[statechart] context sensitive history
by Chris Paulse 01 Dec '07

01 Dec '07

I have the following requirement: States A and B, where B has two substates B1 and B2. When transition occurs from B to A, and then from A back to B, under some conditions it is desired for B1 to be the initial substate, while in others we would like the substate to be chosen based on B's shallow history. Is there a concise way to obtain this behavior from the statecharts library? Thanks, Chris

2 1

Building Python.Boost 2 with VC
by Marko Bozikovic 30 Nov '07

30 Nov '07

Hi all, I'm having problems building Boost.Python with VC 2003. I'm reading the howto, but I must be missing something. My Python 2.4 is installed in C:\Python (using official Windows installer) My user-config.jam looks like this: import toolset : using ; using msvc : 7.1 ; using python : 2.4 : C:\\Python ; (I have tried C:\Python and C:/Python, no luck) When I run bjam: tools\bjam.exe --with-python I get the following error: WARNING: No python installation configured and autoconfiguration failed. See http://www.boost.org/libs/python/doc/building.html for configuration instructions or pass --without-python to suppress this message and silently skip all Boost.Python targets warning: Python location is not configured warning: the Boost.Python library won't be built ...found 1 target... user-config.jam is begin read, because bjam reports errors in it. What am I missing? Thank you, -- Marko ICQ: 5990814 I'm not under the alkafluence of inkahol that some thinkle peep I am. It's just the drunker I sit here the longer I get.

2 3

Serialization: Visual C+ Template Bug ?
by Oliver Kania 30 Nov '07

30 Nov '07

Hello ! When linking a program that consists only of main.cpp with a library that serializes a class "Palo Cllient" I get the following message (sry for the mess): ================================================== error LNK2019: unresolved external symbol "private: void __thiscall jedox::palo::PaloClient::serialize<class boost::archive::text_oarchive>(class boost::archive::text_oarchive &,unsigned int)" (??$serialize@ Vtext_oarchive@archive@boost@@@ PaloClient@palo@jedox@@AAEXAAVtext_oarchive@archive@boost@@I@Z) referenced in function "public: static void __cdecl boost::serialization::access::serialize<class boost::archive::text_oarchive,class jedox::palo::PaloClient>(class boost::archive::text_oarchive &,class jedox::palo::PaloClient &,unsigned int)" (??$serialize@ Vtext_oarchive@archive@boost@@VPaloClient@palo@jedox@@@ access@serialization@boost@@SAXAAVtext_oarchive@archive@2@AAVPaloClient@ palo@jedox@@I@Z) ================================================== This happens even though I do NOT explicitly serialize anything. Main.cpp includes: #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> For the class PaloClient, I do use the Pimpl idiom and serialize as it is recommended in the documentation: PaloClient.cpp: -------------------------------------------------------------- #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/scoped_ptr.hpp> .... template<class Archive> void PaloClient::serialize( Archive &ar, const unsigned int version ) { ar & m_PaloClientImpl; } template void PaloClient::serialize<boost::archive::text_iarchive>( boost::archive::text_iarchive & ar, const unsigned int file_version ); template void PaloClient::serialize<boost::archive::text_oarchive>( boost::archive::text_oarchive & ar, const unsigned int file_version ); ------------------------------------------------------------------------ Now, when I change this to void PaloClient::serialize(boost::archive::text_iarchive & ar, const unsigned int file_version) { ar & m_PaloClientImpl; } void PaloClient::serialize (boost::archive::text_oarchive & ar, const unsigned int file_version) { ar & m_PaloClientImpl; } The linkage error disappears. I guess this is a Visual C++ compiler problem but I wanted to post this in case someone else has similar problems. Kind regards, Oliver PS: Thanks for this great serialization library, it saved me many weeks of programming.

2 2

[statechart] round trip eng. diagramming tool
by Chris Paulse 30 Nov '07

30 Nov '07

I seem to remember seeing an open request for a diagramming tool for Boost statecharts that would be similar in concept to the Rhapsody product. Has there been any further development on this front? Thanks. Chris

2 1

boost::serialization and boost::shared_ptr are not working on tree data structure uses PIMPL idiom
by Youhei Murakami 29 Nov '07

29 Nov '07

Hello everyone. I tried to serialize tree data structure. Tree-structure's "node"-class holds "Impl"-structure and Impl-structure holds child nodes as vector<shared_ptr<node> >. Problems occur when serializing a tree structure that was constructed using above structures. Compile errors not occur, but run-time error occures at serialization of input-stream. If exists someone who knows the reason of it., please teach me that. please god bless me! A problematic souce code has been written below and is attached on this mail. [Emveironment] -Windows XP 64bit -Visual Studio 2005 sp1 -boost-1_34_1 #include <iostream> #include <fstream> #include <cstdlib> #include <vector> #include <boost/shared_ptr.hpp> #include <boost/intrusive_ptr.hpp> #include <boost/serialization/serialization.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/vector.hpp> #include <boost/serialization/shared_ptr.hpp> #include <boost/serialization/version.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/tracking.hpp> #include <boost/serialization/is_abstract.hpp> #include <boost/serialization/nvp.hpp> #define BOOST_LIB_NAME boost_serialization #include <boost/config/auto_link.hpp> #include <boost/archive/text_woarchive.hpp> #include <boost/archive/text_wiarchive.hpp> #include <boost/serialization/export.hpp> #include <boost/serialization/split_member.hpp> using namespace std; using namespace boost; using namespace boost::serialization; namespace test { class nodebase { public: typedef shared_ptr<nodebase> NodePointer; typedef vector<NodePointer> Children; typedef Children::iterator ChildIterator; public: nodebase(){} nodebase( const wstring &n ) : name(n) {} virtual ~nodebase(){} wstring getname() { return name; } void setname( const wstring &newname ) { name = newname; } private: wstring name; private: friend class serialization::access; template <class Archive> void serialize( Archive &ar, const unsigned int version ) { ar.register_type<nodebase>(); ar & name; } public: virtual void SetParent( const NodePointer &parent ) = 0; virtual Children GetChildren( void ) = 0; virtual void AddChild( const NodePointer &child ) = 0; virtual void RemoveChild( const NodePointer &child ) = 0; virtual void Traverse( const NodePointer &root ) = 0; }; class node : public nodebase { private: struct Impl { Impl() {} Impl( const Children &v ) : children(v) {} Impl( const Children &v, const NodePointer &p ) : children(v), parent(p) {} public: Children children; NodePointer parent; private: friend class serialization::access; template <class Archive> void serialize( Archive &ar, const unsigned int version ) { ar.register_type<Impl>(); ar & children; //ar & parent; } }; shared_ptr<Impl> pimpl; public: // constructor/destructor node() : pimpl( new Impl ) {} node( const wstring &n ) : nodebase(n), pimpl( new Impl ) {} node( const Children &v ) : pimpl( new Impl( v ) ) {} node( const Children &v, const NodePointer &p ) : pimpl( new Impl( v, p ) ) {} private: // serialization friend class serialization::access; template <class Archive> void serialize( Archive &ar, const unsigned int version ) { base_object<nodebase>(*this); void_cast_register<node, nodebase>(); ar.register_type<node>(); ar & pimpl; } public: // operations virtual void SetParent( const NodePointer &p ) { pimpl->parent = p; } virtual Children GetChildren( void ) { return pimpl->children; } virtual void AddChild( const NodePointer &child ) { this->pimpl->children.push_back( child ); } virtual void RemoveChild( const shared_ptr<nodebase> &child ) { for( ChildIterator i = pimpl->children.begin(); i != pimpl->children.end(); i++ ) { if( (*i).get() == child.get() ) { pimpl->children.erase( i ); break; } } } virtual void Traverse( const shared_ptr<nodebase> &node ) { if( !node ) { return; } #ifdef _DEBUG wcout << node->getname() << endl; #endif Children children = node->GetChildren(); for( ChildIterator i = children.begin(); i != children.end(); i++ ) { Traverse( *i ); } } void print() { for( Children::iterator i = pimpl->children.begin(); i != pimpl->children.end(); i++ ) { wcout << i->get()->getname() << endl; } } }; }; BOOST_CLASS_TRACKING(test::nodebase, boost::serialization::track_always); BOOST_CLASS_TRACKING(test::node, boost::serialization::track_always); int _tmain(int argc, _TCHAR* argv[]) { using namespace test; { node::NodePointer root( new node(wstring(L"root")) ); node::NodePointer c1( new node(wstring(L"c1")) ); node::NodePointer c2( new node(wstring(L"c2")) ); node::NodePointer c3( new node(wstring(L"c3")) ); node::NodePointer c4( new node(wstring(L"c4")) ); node::NodePointer c5( new node(wstring(L"c5")) ); c3->AddChild( c5 ); c1->AddChild( c3 ); c2->AddChild( c4 ); root->AddChild( c1 ); root->AddChild( c2 ); root->Traverse( root ); { // output wofstream ofile( "serialized.txt" ); try { archive::text_woarchive oa( ofile ); oa << (const node&)(*root); } catch( boost::archive::archive_exception &e ) { cout << "At the output : " << e.what() << endl; getchar(); ofile.close(); exit(1); } ofile.close(); } node::NodePointer in; { // input wifstream ifile( "serialized.txt" ); try { archive::text_wiarchive ia( ifile ); ia >> in; } catch( boost::archive::archive_exception &e ) { cout << "At the input : " << e.what() << endl; getchar(); ifile.close(); exit(e.code); } ifile.close(); } } getchar(); return 0; }

2 1

boost::filesystem drive letters?
by Jay Lawrence 29 Nov '07

29 Nov '07

Hi all, After a bit of searching around I am pretty sure I can't get a list of available drive letters with this library, does anyone know of a way to achieve? (platform independant would be ideal) Best, Jay

2 2

mpl::vector to boost::function
by Michael Linck 29 Nov '07

29 Nov '07

This my first attempt at using the boost::mpl library, so I may be off on the wrong track. If that's the case, please let me know and I'll come up with a different way to solve my problem. This seemed like a good practice case though. I'm trying to write a class that can test a function (eventually any function). The idea is that you specialize some number of arguments ( up to ten ) and then hand it a function. Then you feed "test cases" into it, which consist of arguments and an expected result. It seemed to me that TMP might be the key avoid having to write the template class 10 times (once for each number of template parameters). I thought it would look something like this: template<typename TestResultTA, typename TestInput1TA, typename TestInput2TA = void, typename TestInput3TA = void, typename TestInput4TA = void, typename TestInput5TA = void, typename TestInput6TA = void, typename TestInput7TA = void, typename TestInput8TA = void, typename TestInput9TA = void, typename TestInput10TA = void> class TestScenario { typedef boost::mpl::vector<TestInput1TA, TestInput2TA, TestInput3TA, TestInput4TA, TestInput5TA, TestInput6TA, TestInput7TA, TestInput8TA, TestInput9TA, TestInput10TA> TenArgs; typedef typename boost::mpl::find<TenArgs, void>::type FirstUnusedArg; typedef typename TenArgs::erase<TenArgs, FirstUnusedArg, TenArgs::end> JustTheArgs; // I know this is non-sense but what should go here? typedef boost::function2<TestResultTA, JustTheArgs> TestFunctionTS; . . . So far so good. I have a type that is a vector of the subset of template arguments that are initialized. I've thought about maybe trying to use #defines and recursion to create a template argument string for the boost::function, or something. That seems totally hideous, likely to fail, and my coworkers wouldn't accept it as maintainable code anyway just because of the #defines' presence. Is there an elegant way to go from a vector of types to an argument list for another template? I would have to use this mechanism to also specialize various other functions, like the one that accepts sets of arguments, and some kind of struct for holding those arguments at run-time. Thank you, mike

2 1

suspected bug
by Laurence Bunnage 29 Nov '07

29 Nov '07

I am currently maintaining a project written using Borland C++ Builder version 6 build 10.166 and boost version 1.32. I found I had a reoccuring problem in my code whereby the output from lexical_cast<string>(any_double) was not at the precision I was expecting. It started off OK, but after a while it changed. I have tracked it down to some of my code which I simplified to that shown below. The first cast, in the try block, works correctly with the output value d = 5.0 and no assert The second cast, in the catch statement, returns a value of d = 5.00000013628211 and asserts. With the assert removed, all subsequent calls to lexical_cast continue to give similar results. try { double d = boost::lexical_cast<double>(boost::lexical_cast<std::string>(5.0)); assert(d == 5.0); throw std::runtime_error("Not enough points in peak"); } catch (std::exception& e) { double d = boost::lexical_cast<double>(boost::lexical_cast<std::string>(5.0)); assert(d == 5.0); } I have searched the boost website for similar problems and have not found anything (doesn't mean it's not there, just I haven't found it) Any help, especially a solution or work around would be greatly appreciated. NOTE at this time, due to the current state of the project, I would prefer not to have to upgrade to a newer version of the boost library. Laurence Bunnage Software Engineer e-mail: Laurence.Bunnage(a)teraview.com <mailto:Laurence.Bunnage@teraview.com> TeraView Limited Registered in England Registered Office: Platinum Building, St John's Innovation Park, Cambridge CB4 0WS Registered Number: 04126946 VAT Number: 770 8883 84

3 3

boost-users [pointer containers] stl set_unions
by chun ping wang 29 Nov '07

29 Nov '07

is it possible to use stl set_unions with ptr_container or do I have to hand roll my own. if yes what inserter should i use or how would i use two containers having pointer of int ptr_vector<int> a1; ptr_vector<int> a2; have a1 union a2 and store in a3.

3 6

ERROR on serialization for vector<shared_ptr<T> > with PIMPL idiom
by Youhei Murakami 29 Nov '07

29 Nov '07

Hello everyone. I tried to serialize vector<shared_ptr<T> > that is held by pimpl but I met to a lot of error. If someone who knows the resason for it exists, please teach me the reason. source code is below. Compiled using visual studio 2005 sp1 in WindowsXP64bit. boost-1_34_1 source code has been attached. // test_serialization.cpp : Defines the entry point for the console application. // //#include "stdafx.h" #include <iostream> #include <fstream> #include <cstdlib> #include <typeinfo> #include <memory> #include <algorithm> #include <vector> #include <map> #include <boost/any.hpp> #include <boost/shared_ptr.hpp> #include <boost/intrusive_ptr.hpp> #include <boost/ptr_container/ptr_vector.hpp> #include <boost/thread.hpp> #include <boost/tuple/tuple.hpp> #include <boost/tuple/tuple_comparison.hpp> #include <boost/tuple/tuple_io.hpp> #include <boost/type_traits.hpp> #include <boost/optional.hpp> #include <boost/serialization/serialization.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/vector.hpp> #include <boost/serialization/list.hpp> #include <boost/serialization/map.hpp> #include <boost/serialization/set.hpp> #include <boost/serialization/deque.hpp> #include <boost/serialization/shared_ptr.hpp> #include <boost/serialization/scoped_ptr.hpp> #include <boost/serialization/split_member.hpp> #include <boost/serialization/version.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/tracking.hpp> #include <boost/serialization/is_abstract.hpp> #include <boost/serialization/nvp.hpp> #define BOOST_LIB_NAME boost_serialization #include <boost/config/auto_link.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/text_woarchive.hpp> #include <boost/archive/text_wiarchive.hpp> using namespace std; using namespace boost; using namespace boost::serialization; namespace test{ class holder { struct Impl { Impl() : x(0.0), y(0.0), message(wstring(L"blank")) { vec.push_back(shared_ptr<int>( new int(1) )); vec.push_back(shared_ptr<int>( new int(2) )); vec.push_back(shared_ptr<int>( new int(3) )); } Impl( double ax, double ay, const wstring &am, const vector<shared_ptr<int> > &av ) : x(ax), y(ay), message(am), vec(av) { } double x, y; wstring message; vector<shared_ptr<int> > vec; private: friend class serialization::access; template <class Archive> void serialize( Archive &ar, const unsigned long version ); }; shared_ptr<Impl> impl; public: holder() : impl( new Impl ) {} holder( double ax, double ay, const wstring &am, const vector<shared_ptr<int> > &av ) : impl( new Impl(ax, ay, am, av) ) {} private: friend class serialization::access; template <class Archive> void serialize( Archive &ar, const unsigned long version ) { ar & impl; } }; template <class Archive> void holder::Impl::serialize(Archive &ar, const unsigned long version ) { ar & x; // ok ar & y; // ok ar & message; // ok ar & vec; // error : if remove this line, this source code will move file. } template void holder::serialize<archive::text_woarchive>( archive::text_woarchive &ar, const unsigned long version ); template void holder::serialize<archive::text_wiarchive>( archive::text_wiarchive &ar, const unsigned long version ); template void holder::Impl::serialize<archive::text_woarchive>( archive::text_woarchive &ar, const unsigned long version ); template void holder::Impl::serialize<archive::text_wiarchive>( archive::text_wiarchive &ar, const unsigned long version ); }; // end namespace test2 int _tmain(int argc, _TCHAR* argv[]) { using namespace test; { wofstream ofile( L"hierarchy.txt" ); archive::text_woarchive oa(ofile); holder h; oa << (const holder&)h; ofile.close(); holder ih; wifstream ifile( L"hierarchy.txt" ); archive::text_wiarchive ia(ifile); ia >> ih; ifile.close(); }; getchar(); return 0; }

1 0

Library & Header file paths on Windows with Boost
by jayc.lawrence＠gmail.com 29 Nov '07

29 Nov '07

Hi, This post is not really 100% boost specific but I am trying to compile using boost libraries and I thought I'd give this newsgroup a shot. I want to know what have others done to avoid the circles I've gone in to get this simple program compiled. I compiled boost to "c:\boost\" and I have my MinGW installed in "c:\devel\MinGW\" however if I attempt to compile using: g++ -v -Ic:\boost\ simplels.cpp -Lc:\boost\lib\ -lboost_filesystem-mgw34-d-1_34_1 It would result in failing to include the header files and I noticed: ignoring nonexistant directory "c:/boost/" Am I going crazy here or does it appear that the compiler cannot access anything beyond its default include paths? So I tested it out... I made a directory in MinGW called "test" and used the following command line: g++ -v -Ic:\devel\MinGW\test\ headertest.cpp And still no header files.. It resulted in: ignoring nonexistant directory "c:/devel/MinGW/test/" I thought i'd add it my windows %path% too but still had exactly the same problem. So I finally resorted to putting the header files in the MinGW/GCC include directory and the library files in the MinGW/GCC library directory.. et voila! it compiled. But this isn't ideal for me, anyone got any tips where I'm going wrong here cause sure it's compiling now but.. I like to keep things relatively tidy on here! Best, Jay

2 2

Boost Asio within dotnet app : "Acces denied"
by Guillaume Baranger 29 Nov '07

29 Nov '07

Hello, I need to create a server in dotnet application. I am using boost 1.33.1, asio 0.3.8 and vc++ 7.1 . The following code raises an "access denied" exception in a dotnet application. I have tested the same simple code in native c++ application, and it works. Do you have any idea how to resolve my problem? Is there a way to use asio in a dotnet application? try { asio::io_service io_service; asio::ip::tcp::acceptor acceptor(io_service); asio::ip::tcp::endpoint endpoint(asio::ip::tcp::v4(), 35454); acceptor.open(endpoint.protocol()); acceptor.set_option(asio::ip::tcp::acceptor::reuse_address(true)); // exception thrown here acceptor.bind(endpoint); // exception thrown here if previous line in comment acceptor.listen(); } catch(std::exception& excep) { MessageBox::Show(excep.what(),S"",MessageBoxButtons::OK,MessageBoxIcon::Erro r); } Regards, Baranger Guillaume

1 0

Trying to get Boost.Interprocess going on OS X 10.5.1
by Stefan Arentz 29 Nov '07

29 Nov '07

I checked out boost trunk from svn and tried to compile a simple boost.interprocess example. Unfortunately it fails at a rather unexpected place: % c++ doc_message_queueA.cpp -Itrunk -o doc_message_queueA % ./doc_message_queueA Assertion failed: (res == 0), function lock, file trunk/boost/interprocess/sync/posix/interprocess_mutex.hpp, line 116. zsh: abort ./a The error code is 22, EINVAL. I'm on OS X 10.5.1, maybe that is too new, or not yet tested? S.

4 9

[Boost.Array] surprising performance issue
by Bryan Green 29 Nov '07

29 Nov '07

Hello, I've discovered a situation where using boost::array results in a 2-fold performance degradation over other array types, including C arrays, tr1::array, and a simple handwritten array class. While the tr1::array performs well, I was suprised to find that it pads the array, so sizeof(tr1::array<3,float>) == sizeof(tr1::array<4,float>). Is that a requirement of tr1::array? Anyway, the performance problem can be seen using Intel C++ (v9.1) on the Itanium platform, using '-O3' optimization. I'm forced to take boost::array out of my computation's inner loop. Is this a previously known issue? Any ideas why this performance discrepancy might exist? Thanks, Bryan Green

7 8

[dataflow] version 0.8.1: runtime reflection, dataflow network modeling via BGL...
by Stjepan Rajko 29 Nov '07

29 Nov '07

Hello everyone, I have uploaded a new version of the dataflow library to the vault (in the Dataflow directory), and updated the docs at: http://dancinghacker.com/code/dataflow/ The new version introduces the Dataflow.Blueprint layer, which provides runtime reflection of components/ports, as well as modeling and analysis of dataflow networks via BGL. This new layer is still full of hacks, its documentation is limited to a messy example, but I'm excited about having started it. This version also has some documentation updates and some additional examples (such as a little image processing dataflow example using Boost.GIL). If anyone is interested, my roadmap to requesting review looks like this: * add lots and lots of docs. * bring the Dataflow.Blueprint to some reasonably usable state. * move functionality from the overabused Port-related concepts into the Component concept, which should clean up and simplify the concepts dramatically. With this, I think the library will be in decent shape to request a review (it will have one dataflow framework modeling the generic concepts - Dataflow.Signals, and one layer built on top of the concepts, - Dataflow.Blueprint). My goal is to get there in the next month (which is only 5 months after GSoC close! :-)) By the time it actually gets to be reviewed, I hope to also add in another dataflow framework that would in some way address the things currently missing from this library (there are many). Any feedback is appreciated. Thanks to Phil Endecott, Pavel Vozenilek, John Torjo, Roland Schwarz and Neal Becker for their helpful feedback on the previous version. Regards, Stjepan

1 0

BGL: edge index and bundled properties
by Salvatore Domenick Desiano 29 Nov '07

29 Nov '07

After several hours of reading the newsgroups and working backward through BGL header files, I've accepted that I need help. I have a graph with bundled properties. The edge properties include and index. I can't, for the life of me, figure out one thing: How do I get algorithms (e.g., those in subgraph) to see the edge index as a edge_index_t property? My code is fairly simple (though my failed attempts at getting subgraph, et al, to find the edge index have been long). Formatted for brevity: struct _Vertex_Data { unsigned index; unsigned blob_id; }; struct _Edge_Data { unsigned index; unsigned count; }; typedef adjacency_list<setS,setS,undirectedS,_Vertex_Data,_Edge_Data> _BGL_Graph_Base; struct _Graph_Base : public _BGL_Graph_Base { typedef my_graph_tag graph_tag; }; typedef subgraph<_Graph_Base> _Graph; my_graph_tag is left over from a previous attempt, but I suspect it will be required to get this to work. I've tried overloading the property selectors, but I keep hitting a wall. I have seen ways to do this with the older property structure, but my bundled properties will eventually be elaborate, so I'd like to use this mechanism. I hope the BGL gurus are still around... the "classic" e-mails seem old... Thank you for your time and help. -- Sal smile.

1 1

Interval library
by john 28 Nov '07

28 Nov '07

Hello, I am trying to use the Interval library to solve boolean expressions like this: (I1 AND I2) or I3, where I1, I2 and I3 are intervals. I can get the AND part with the intersect function. I can guess the OR part if there is any intersection or not (and then use hull). I handle the priorities myself (I split the expression with Spirit). This expression can be easily solved. My problem is working with big expressions including OR. For example if I have "(I1 OR I2) AND I3" I cannot call intersect( I1|I2, I3). This is easy as it is a small expression, but when it gets to 10+ members... Is there anything I can do ? Is there any way to 'combine' intervals (ie keeping the union somewhere)? I believe this is easy to solve, I just don't know where to look for. Thank you, John

2 6

MPL & Shared Libraries
by Robert Dailey 28 Nov '07

28 Nov '07

Hi, I heard from someone that when building a shared library (DLL file), the compiler will not do the same processing of MPL code that it would do for an EXE. For example: struct Foo { static const float val = 1.5f; }; When exporting the 'Foo' class to a shared library, what will become of the 'val' member? Is just the number "1.5f" written out or what? I've given a very simple example, but the more complex example expands into the boost::mpl library, which follows the same concepts.

3 2

Boost. Parameter and deduced constructor ?
by StephQ 28 Nov '07

28 Nov '07

Thank you for your previous help with the Boost. Parameter library, I have been able to solve my problem. I would like to know if is it possible in any way to exploit the Boost. Parameter library to get a template class with a constructor that automatically deduce the correct template parameters. If not I would like to know if there exist a convenient way to minimize the pain resulting from template classes. For example now I have to write: VariateSampler< GaussianDistribution, MersenneTwisterPseudoRng> gaussianSampler( myGenerator, GaussianDistribution() ); Creating a make_VariateSampler function alone does not buy me anything. I would like to write: I would really like to write: VariateSampler<> gaussianSampler = make_VariateSampler( myGenerator, GaussianDistribution() ); VariateSampler<> poissonSampler = make_VariateSampler( myGenerator, PossionDistribution() ); and gaussianSampler and poissonSampler be of different types (deduced from the rhs): gaussianSampler of type VariateSampler<MersenneTwisterPseudoRng,GaussianDistribution> and poissonSampler of type VariateSampler<MersenneTwisterPseudoRng,PoissonDistribution> Now, these types are not complicated, but I am using a template decorator approach to modify the behaviour of these samplers and the resulting types are too nasty for anyone to write them. How could I improve the situation? Something like boost::function for classes? The point is that I (the user) could not care less about these types, only the sampler class needs to know them to operate correctly. Do I have necessarily to create them (via a make_VariateSampler) and pass them on the fly where needed? Thank you StephQ

2 1

boost::serialization binary archives not portable?
by Daniel Oberhoff 28 Nov '07

28 Nov '07

Hi, I have a problem with boost::serialization in that I cannot transport binary archives between my macbookpro (osx 10.4 latest update) and my dell box at work (ubuntu gutsy with universe). As a test I just serialized a 10-byte binary object. Has anyone else been moving binary archives between different platforms? here are the stacktraces up to the exception throws Moving from ubuntu to osx I get this #7 0x0001bcc8 in boost::throw_exception<boost::archive::archive_exception> () at libs/serialization/src/basic_serializer_map.cpp:52 #8 0x0000f104 in boost::archive::basic_binary_iarchive<boost::archive::binary_iarchive>::init (this=0xbfffeec8) at ./boost/archive/impl/basic_binary_iarchive.ipp:54 #9 0x0000f20b in boost::archive::binary_iarchive_impl<boost::archive::binary_iarchive, char, std::char_traits<char> >::init (this=0xbfffeec8, flags=0) at ./boost/archive/binary_iarchive_impl.hpp:51 #10 0x0000f4a4 in boost::archive::binary_iarchive_impl<boost::archive::binary_iarchive, char, std::char_traits<char> >::binary_iarchive_impl (this=0xbfffeec8, is=@0xbfffec30, flags=0) at ./boost/archive/binary_iarchive_impl.hpp:80 #11 0x0001862d in boost::archive::binary_iarchive::binary_iarchive () at libs/serialization/src/basic_serializer_map.cpp:52 #12 0x00002bda in main () the other direction: #4 0x00002b41bac2d773 in std::terminate () from /usr/lib/libstdc++.so.6 #5 0x00002b41bac2d85a in __cxa_throw () from /usr/lib/libstdc++.so.6 #6 0x00002b41babc944a in std::__throw_length_error () from /usr/lib/libstdc++.so.6 #7 0x00002b41bac0cda2 in std::string::resize () from /usr/lib/libstdc++.so.6 #8 0x00000000004339de in boost::archive::basic_binary_iprimitive<boost::archive::binary_iarchive, char, std::char_traits<char> >::load (this=0x7ffff015afe0, s=@0x7ffff015ad50) at ./boost/archive/impl/basic_binary_iprimitive.ipp:96 #9 0x0000000000433a23 in boost::archive::load_access::load_primitive<boost::archive::binary_iarchive, std::string> (ar=@0x7ffff015afd0, t=@0x7ffff015ad50) at ./boost/archive/detail/iserializer.hpp:96 #10 0x0000000000433a43 in boost::archive::detail::load_non_pointer_type<boost::archive::binary_iarchive, std::string>::load_primitive::invoke (ar=@0x7ffff015afd0, t=@0x7ffff015ad50) at ./boost/archive/detail/iserializer.hpp:339 #11 0x0000000000433a63 in boost::archive::detail::load_non_pointer_type<boost::archive::binary_iarchive, std::string>::invoke (ar=@0x7ffff015afd0, t=@0x7ffff015ad50) at ./boost/archive/detail/iserializer.hpp:414 #12 0x0000000000433a83 in boost::archive::load<boost::archive::binary_iarchive, std::string> (ar=@0x7ffff015afd0, t=@0x7ffff015ad50) at ./boost/archive/detail/iserializer.hpp:561 #13 0x0000000000433aae in boost::archive::detail::common_iarchive<boost::archive::binary_iarchive>::load_override<std::string> (this=0x7ffff015afd0, t=@0x7ffff015ad50) at ./boost/archive/detail/common_iarchive.hpp:59 #14 0x0000000000433ad3 in boost::archive::array::iarchive<boost::archive::binary_iarchive>::load_override<std::string> (this=0x7ffff015afd0, x=@0x7ffff015ad50, version=0) at ./boost/archive/array/iarchive.hpp:122 #15 0x0000000000433afb in boost::archive::basic_binary_iarchive<boost::archive::binary_iarchive>::load_override<std::string> (this=0x7ffff015afd0, t=@0x7ffff015ad50) at ./boost/archive/basic_binary_iarchive.hpp:62 #16 0x0000000000433b23 in boost::archive::binary_iarchive_impl<boost::archive::binary_iarchive, char, std::char_traits<char> >::load_override<std::string> (this=0x7ffff015afd0, t=@0x7ffff015ad50) at ./boost/archive/binary_iarchive_impl.hpp:45 #17 0x0000000000433b50 in boost::archive::detail::interface_iarchive<boost::archive::binary_iarchive>::operator>><std::string> (this=0x7ffff015afd0, t=@0x7ffff015ad50) at ./boost/archive/detail/interface_iarchive.hpp:63 #18 0x0000000000433b87 in boost::archive::basic_binary_iarchive<boost::archive::binary_iarchive>::init (this=0x7ffff015afd0) at ./boost/archive/impl/basic_binary_iarchive.ipp:52 #19 0x000000000040c8ee in boost::archive::binary_iarchive_impl<boost::archive::binary_iarchive, char, std::char_traits<char> >::init (this=0x7ffff015afd0, flags=0) at ./boost/archive/binary_iarchive_impl.hpp:51 #20 0x000000000040c971 in binary_iarchive_impl (this=0x7ffff015afd0, is=@0x7ffff015b790, flags=0) at ./boost/archive/binary_iarchive_impl.hpp:80 #21 0x000000000040c9db in boost::archive::binary_iarchive::binary_iarchive () at ./boost/archive/codecvt_null.hpp:48 #22 0x0000000000405518 in main () daniel

4 5

Follow-up on 64 bit boost
by Phil Hystad 28 Nov '07

28 Nov '07

Yet another question on 64 bit boost (follow-up)... Can someone confirm that boost builds OK on Windows 64 bit platforms and if the "address-model=64" instruction applies to the somewhat confusing (to me) 64 bit Windows architecture. Thanks for the confirmations on Red Hat 64 bit. 73, phil phystad(a)mac.com

2 1

Boost 1.35 release date
by Chauhan, Vikas 28 Nov '07

28 Nov '07

Hello, Can you please advise the planned release date for BOOST 1.35 version. Regards, Vikas

2 1

BOOST_STATIC_ASSERT
by Hicham Mouline 28 Nov '07

28 Nov '07

hi, template <typename CT> class C { BOOST_STATIC_ASSERT(...); }; class D; I would like to forbid the instantiation of C<D>. How can i compare CT with D to serve as the condition of the boost static assert=? rds,

3 2