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Re: [Boost-users] [Proto] Annoying MSVC bug
by Vial, Florent 08 Mar '09

08 Mar '09

>> I'd like to encourage Microsoft to reopen this bug report and fix it. >> Could any of you with logins to Microsoft Connect go here >> https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?Fe edbackID=282942 >> and answer their 3 question survey expressing your dissatisfaction and >> encourage them to fix this. For those lazy not wanting to browse back like i did: the connect ID is 282942. >https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?F eedbackID=283021 And here 283021. Cheers, Florent Arnold & Richter Cine Technik GmbH & Co. Betriebs KG Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRA 57918 Personlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRB 54477 Geschaftsfuhrer: Prof. Dr. Dejan Ilic; Franz Kraus; Jens Schafer

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[mem_fn] Ambiguous call to mem_fn with stdcall function
by Conrad Scott 08 Mar '09

08 Mar '09

I'm trying to use g++ (and MinGW) to compile a win32 Direct3X program that I've written under Visual C++. All is well (so far) except for one thing. I'm using the technique suggested in the Boost shared_ptr documentation to store pointers to COM objects, which works fine under Visual C++ but under g++ (either 3.4.x or 4.3.x) I get errors about the call to mem_fn being ambiguous due to stdcall / non-stdcall overloading. I can't find any references to this problem on the net so I assume I'm doing something utterly boneheaded. Any hints would be very welcome. For example: #define BOOST_MEM_FN_ENABLE_STDCALL #include <d3d9.h> #include <boost/mem_fn.hpp> #include <boost/shared_ptr.hpp> void test_mem_fn(IDirect3DDevice9 * const device) { boost::shared_ptr<IDirect3DDevice9> ptr( device, boost::mem_fn(&IDirect3DDevice9::Release) ); } test/test_mem_fn.cpp:13: error: call of overloaded 'mem_fn(ULONG (IDirect3DDevice9::*)())' is ambiguous C:/Boost/include/boost-1_38/boost/bind/mem_fn_cc.hpp:15: note: candidates are: boost::_mfi::mf0<R, T> boost::mem_fn(R (T::*)()) [with R = ULONG, T = IDirect3DDevice9] C:/Boost/include/boost-1_38/boost/bind/mem_fn_cc.hpp:15: note: boost::_mfi::mf0_stdcall<R, T> boost::mem_fn(R (T::*)()) [with R = ULONG, T = IDirect3DDevice9] C:/Boost/include/boost-1_38/boost/mem_fn.hpp:382: note: boost::_mfi::dm<R, T> boost::mem_fn(R T::*) [with R = ULONG ()(), T = IDirect3DDevice9] Many thanks, Conrad

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Options for --build-type
by Juan D Guzman 07 Mar '09

07 Mar '09

I'm building boost and was wondering other than --build-type=complete what are the other options. Disk usage approaches 40 gigs with the complete option.

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Boost.python - How to export shared_ptr<vector<shared_ptr<string> > >?
by blp330 07 Mar '09

07 Mar '09

Hi, I have a function that returns type boost::shared_ptr<std::vector<boost::shared_ptr<std::string> > >, I have registered that: // boost::shared_ptr<std::string> -> PyString Converter. struct StringPointerToPyString { static ::PyObject* convert( ::boost::shared_ptr<::std::string> const& p_str ){ return ::PyString_FromStringAndSize( p_str->data(), p_str->size() ); } }; bp::class_< std::vector<StringPtr> > ("vector_StringPtr") .def (bp::vector_indexing_suite< std::vector<StringPtr> >()); bp::register_ptr_to_python< boost::shared_ptr< std::vector<StringPtr> > >(); It works fine but when I try to access the returned vector, I got error: >>> v = my_function() >>> v[0] TypeError: No Python class registered for C++ class class boost::shared_ptr<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > I tried to add bp::register_ptr_to_python< boost::shared_ptr< std::string > >(); But still not work. How can I make it work? Thanks you very much. -- View this message in context: http://www.nabble.com/Boost.python---How-to-export-shared_ptr%3Cvector%3Csh… Sent from the Boost - Users mailing list archive at Nabble.com.

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Portable way of getting process directory, temp directory?
by Archie14 07 Mar '09

07 Mar '09

Is there a boost library to get process directory, or temp directory?

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MPL - what rule am I breaking?
by Noah Roberts 06 Mar '09

06 Mar '09

Version A (works): template < typename FIELD > struct rec { typename FIELD::type value; rec() : value() {} protected: typename FIELD::type & ref() { return value; } }; template < typename VEC > struct generate_record : boost::mpl::inherit_linearly< VEC, boost::mpl::inherit< rec<pl::_2>, pl::_1> >::type { typedef VEC fields; }; Version B (fails): template < typename FIELD, bool Writable > struct rec { typename FIELD::type value; // failure point rec() : value() {} protected: typename FIELD::type & ref() { return value; } }; template < typename VEC > struct generate_record : boost::mpl::inherit_linearly< VEC, boost::mpl::inherit< rec<pl::_2, true>, pl::_1> >::type { typedef VEC fields; }; The error I get: 'type' : is not a member of 'boost::mpl::arg<2>' I think I know what's going on, rec<pl::_2, true> is getting immediately instantiated while rec<pl::_2> does not. What I don't know is why or how to fix it. Thanks.

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proto: analytical-only math functions
by Hicham Mouline 06 Mar '09

06 Mar '09

Hello, There are a few posts these days about generic libraries for math derivation of math functions, analytically or numerically. My objective is to start simple with analytical functions, and to expand the result gradually. I have used proto to define terminals : 1. 1D constants 2. 1D variables 3. 1D basic functions <double (double)> ( c++03 cmath + boost::math ) 4. user-defined functions ( 0 or more dimensions ) HEADER struct constant_tag {}; typedef proto::terminal< constant_tag >::type constant; struct variable_tag {}; typedef proto::terminal< variable_tag >::type variable; template < double (*basic_function_ptr)(double) > struct basic_function_tag { typedef double result_type; result_type operator()(double d) const { return basic_function_ptr(d); } }; proto::terminal< basic_function_tag<std::log> >::type const log = {{}}; // 1 example, I have one of these for each function template <size_t dim =1> struct function_tag {}; template <size_t dim> struct function : proto::terminal< function_tag<1> >::type {}; USER CODE ------------------ constant c; variable x,y,z,t,u,v; function<0> h; function<1> f; function<5> g; My grammar will be very simple for a start. All I want to allow are statements like: 1.variable = constant(proto terminal) or literal (actual number, does it have to be proto terminal), for e.g. x = 5; 2. function definition with the = operator. The LHS of the operator can one of: h = h() = f(x) = g(x,y,z,t,u) = // All arguments of f should be "variable"s only and they can't be repeated, and they have to match the dimension my LHS grammar looks like: template <size_t dim> struct function_def_lhs_grammar : proto::function< function_tag<dim>, proto::vararg< proto::terminal< variable_tag > > > {}; template <> struct function_def_lhs_grammar<0> : proto::or_< proto::terminal< function_tag<0> >, proto::function< function_tag<0>, proto::vararg< proto::terminal< variable_tag > > > {}; But vararg is not what I want at all: I want to have 0 variables (nothing) for the 0-dim function in the proto::function case, And I want to have exactly dim variables in the dim>0 proto::function case. Is it possible to "math-define" the function at the same time of the function<> object definition (in c++ terms) and have the dimension deducted, like: function f(x,y,z) = x+y+z ; The next step will be to worry about the RHS which is the much more complicated bit, regards,

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boost CPDAG help
by montassar benmessaoud 06 Mar '09

06 Mar '09

Hi, I would know if it is possible to use Boost to code a partially directed graph (Completely partially DAG) CPDAG. I have a look to the class adjacency_matrix but it is used only for completely directed graph or completely undirected graph. Would you please let me know if there is any way to manipulate partially directed graph with Boost. very thank you in advance _________________________________________________________________ Découvrez Windows Live Spaces et créez votre site Web perso en quelques clics ! http://spaces.live.com/signup.aspx

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[regex] How to use ICU debug libs when building regex with bjam (win32)
by Christian Hoffmann 06 Mar '09

06 Mar '09

Hi, In our debug builds, we build ICU in debug mode and it creates libraries with a "d" suffix (e.g. icuucd.lib). When I build boost regex now with: bjam.exe -sICU_PATH=<somepath>\icu -d+2 --debug-configuration toolset=msvc-9.0 threading=multi python-debugging=on link=shared variant=debug --without-mpi libs\regex\build it doesn't find the ICU libs and the linker complains. I then tried to give ICU_LINK (e.g. like this): bjam.exe -sICU_PATH=<somepath>\icu -sICU_LINK=icuucd.lib toolset=msvc-9.0 threading=multi python-debugging=on link=shared variant=debug --without-mpi libs\regex\build but it doesn't add the icuucd.lib to the linker file "bin.v2\libs\regex\build\msvc-9.0\debug\python-debugging-on\threading-multi\boost_regex-vc90-mt-gyd-1_38.dll.rsp" and I get unresolved symbols. Any idea how to do this without hacking the Jamfile.v2? Thanks a lot, Chris

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choosing from a list of types based on a runtime value
by Hicham Mouline 06 Mar '09

06 Mar '09

say I have a template <typename Tag> // Tag should be 1 in 10 types struct S { ... }; in a function f(int Tag) // Tag is computed here at runtime { switch(Tag) { case 0: // use S<Tag0> ... case 9: // use S<Tag9> } } Is fusion the lib to help with problems like this, so I don't need to write the full switch case for all types, regards,

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boost:interprocess sizeof(list<Type>::Node)
by waterbed 06 Mar '09

06 Mar '09

Hello, My problem is really basic : I have N objects of type Type to store in a boost::interprocess::list<Type>. The question is easy : How many bytes should I provide to the managed_mapped_file, in order it fits correctly? So, I supposed I had to store (let's assume bi = boost::interprocess): + The list allocator : sizeof( bi::allocator<Type, bi::managed_shared_memory::segment_manager> ) + The struct of the list itself : sizeof( bi::list<Type, bi::allocator<Type, ...> > ) + The N nodes of the list containing each one of my objects : sizeof( bi::list<Type, ...>::Node) First issue : bi::list<Type, ...>::Node is private. Fine, I changed it as public. Second issue : sizeof(bi::list<Type, ...>::Node) was not enough, actually I can't add N objets, I was just able to allocate (N - x) objets Third issue : so I tried to fix the value of x, but x is not constant, it changes according to N... Thus I think, I made a mistake but where? or I forgot something but what? Thank for your help and your advises. -- View this message in context: http://www.nabble.com/boost%3Ainterprocess-sizeof%28list%3CType%3E%3A%3ANod… Sent from the Boost - Users mailing list archive at Nabble.com.

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Interprocess windows_shared_memory 1.35
by Joy Vincent 06 Mar '09

06 Mar '09

I am attempting to create a windows_shared_memory object for a large file that exists using Boost 1.35. I have attempted to create it 2 ways: interprocess::windows_shared_memory *wsm = new interprocess::windows_shared_memory(interprocess::open_or_create, fileName.c_str(), interprocess::read_only,fileSize); I am getting an interprocess exception that the system cannot find the path specified. (boost::error_info is 'not_found_error') The file is valid as previous boost::filesystem calls can successfully create a path object, append a file name and get the file size. The file is large (110MB) so I also attempted a size of 1000 -- same exception. After stepping through some code, it seems I am getting the exception in win32_api.hpp when the CreateFileMappingA is called. Has anyone had issues with windows_shared_memory objects in the 1.35 version? Thanks. Joy

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tcp::acceptor works differently on windows than linux.
by Michael Dehmlow 06 Mar '09

06 Mar '09

I'm writting a multiplatform app which uses a tcp::acceptor. Thread one does: { std::cout<<"Oh but I interupted: "<<std::endl; _myTCPAcceptor->close(); std::cout<<"Done interupting "<<std::endl; } std::cout<<"About to join "<<std::endl; _myAcceptorThread->join(); std::cout<<"Join complete"<<std::endl; Thread two does: { boost::system::error_code ec; boost::asio::socket_base::non_blocking_io command(false); _mySocket.io_control(command,ec); boost::system::error_code ec1; std::cout<<"About to accept "<<std::endl; _myTCPAcceptor->accept(_mySocket,ec1); std::cout<<boost::system::system_error(ec1).what()<<std::endl; std::cout<<"done with the accept"<<std::endl; } Output is: Linux Redhat: About to accept Oh but I interupted: Done interupting About to join ... blocks forever Windows XP: About to accept Oh but I interupted: Done interupting About to join A blocking operation was interrupted by a call to WSACancelBlockingCall done with the accept Join complete on windows xp pro the call populates error code with: A blocking operation was interrupted by a call to WSACancelBlockingCall Any solutions other wise I gotta go to pocking the acceptor with another socket connection :(. -- View this message in context: http://www.nabble.com/tcp%3A%3Aacceptor-works-differently-on-windows-than-l… Sent from the Boost - Users mailing list archive at Nabble.com.

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[regex] How to pass BOOST_REGEX_RECURSIVE to bjam build process (win32)
by Christian Hoffmann 06 Mar '09

06 Mar '09

Hi, we used to compile boost regex in boost version 1.36 with the following command: bjam.exe -sHAVE_ICU=1 -sICU_PATH=../../../../icu -sBOOST_REGEX_RECURSIVE toolset=msvc-7.1 threading=multi python-debugging=on link=shared variant=debug --without-mpi libs\regex\build When switching to boost 1.38, we realized that BOOST_REGEX_RECURSIVE is not passed/picked up anymore when using the same command (apart compiler version to compile (verified with some added pragma messages): How should this be configured nowadays? Or did it never work that way but the default behaviour changed? Maybe the user-config.jam file should be used, but I didn't find an example of how to do this. Thanks a lot, Chris

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BoostCon Registration
by Robert Jones 06 Mar '09

06 Mar '09

BoostCon registration seems to be broken. I started the reg. process, received the confirmation email, followed the link in the email, which gave "Page Not Found". Is there anyone on here who can help? Thanks, Rob.

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[Proto] Annoying MSVC bug
by Dave Jenkins 06 Mar '09

06 Mar '09

Almost every useful Proto program has workarounds for an MSVC bug that causes syntax errors on valid nested function types. Eric Niebler filed a bug report with Microsoft on 6/14/2007 and they closed it on 6/19/2007 with status "Closed(Won't Fix)". This is back in the days of Visual Studio 2005. I'd like to encourage Microsoft to reopen this bug report and fix it. Could any of you with logins to Microsoft Connect go here https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?Feedb… and answer their 3 question survey expressing your dissatisfaction and encourage them to fix this. Thanks, Dave Jenkins

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boost library advice wanted
by Sean Farrow 06 Mar '09

06 Mar '09

Hi: I am in the process of implementing a program that turned commands from voice recognition software in to code that are entered in to an application. there are approximately 200 codes available in this particular sofware I am automating. Wile I could use boost::stringAlgo along with the functions available in the stl there must be a better alternative. To give an idea of howthis would work the user might say: conditional new line, and [l] would be placed in the current document onscreen. the user could say skip 5 lines and [sk5] would be entered.

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xcode iphone vs regular project issues
by Tom Delorenzi 06 Mar '09

06 Mar '09

Hi. I have worked on boost before using Visual Studios and loved using it. I am using a mac for some development now with xcode. My question is 2 fold. First off, on a regular c++ project I can use boost no problem, but I haven't seen how to get the auto complete to list functions through the -> operator. Has anyone had luck? In visual studios i could include the header and the non template header in my project to get this functionality to work. Second question is, when developing a project that was created using the iphone template the program fails to compile when I include any boost.h files, even though I am including them in the exact same way that was succesfull in the c++ project. Has anyone tried this?

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xcode smart pointers
by Tom Delorenzi 06 Mar '09

06 Mar '09

I figured out both my problems. Boost works fine in iphone projects, you just need to have all your source code end in .mm to enable objective-c++ and the other problem is caused because xcode cannot handle templates when it comes to code insight(or namespaces supposidly). Thats really unfortunate.

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Nstate: dynamic_bitset generalized for bounded integer values?
by Hostile Fork 06 Mar '09

06 Mar '09

Hello boost-users! I've written a class in the same spirit as the dynamic_bitset. But instead of being restricted to inserting values that range [0..1], the packed values can range from [0..radix-1]. Nothing that fancy, but a few people on #boost IRC thought it looked potentially useful, so I decided to try announcing it here. The library is called "Nstate", and is released under the boost software license (of course!) http://hostilefork.com/nstate/ As an example, I point out that it can fit 20 "Tristates" (a.k.a. Nstate<3>) into 32 bits, as opposed to 20 bytes (if one used a packing approach with 2 bits per tristate, you would only get 16 of them out of 32 bits). I'm guessing this would be low on the radar in terms of getting vetted for inclusion in boost. But if anyone out there is looking for something *like* this, here's a start. I'd certainly appreciate any peer review or wisdom to help make it better, faster, smarter...boostier? So if you're bored and just like making free libraries have more "Quality" then please send feedback! Files are: http://github.com/hostilefork/nocycle/blob/master/Nstate.hpp http://github.com/hostilefork/nocycle/blob/master/Nstate.cpp Regards, Brian

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Re: [Boost-users] [Units] implicit conversion of quantities
by Christopher Bruns 05 Mar '09

05 Mar '09

Steven Watanabe wrote: > In this particular case, I would suggest writing the function as a template > and casting. In general you can write a forwarding overload that casts as > appropriate. Thanks Steven for the advice. I consulted Matthias Schabel off list to help figure out how to get this working. In case others have similar needs, I am attaching my modified test program. /* =================================== */ #include <boost/units/systems/si.hpp> #include <boost/units/base_units/metric/angstrom.hpp> #include <iostream> namespace boost { namespace units { typedef metric::angstrom_base_unit::unit_type angstrom_unit; BOOST_UNITS_STATIC_CONSTANT(angstrom, angstrom_unit); typedef scaled_base_unit< si::meter_base_unit, scale<10, static_rational<-9> > > nanometer_base_unit; typedef nanometer_base_unit::unit_type nanometer_unit; BOOST_UNITS_STATIC_CONSTANT(nanometer, nanometer_unit); } } // namespace boost::units using namespace boost::units; using namespace std; // First version of showBondLength takes a specific quantity type (nanometers) std::ostream& showBondLength(quantity<nanometer_unit> len, std::ostream& os) { // This implementation could be compiled into a library. os << len << std::endl; } // Second version of showBondLength can take any length type, and casts it to // the specific type. The parameter type is a bit long winded for a public API // method, but not unreadable. template<class Y> std::ostream& showBondLength(quantity<unit<length_dimension, Y> > len, std::ostream& os) { // This (simple, forwarding) implementation must be fully defined in a header. return showBondLength( (quantity<nanometer_unit>)len, os); } int main() { // These constructors all work; conversions are automatic quantity<nanometer_unit> len1(0.152 * nanometer); quantity<angstrom_unit> len2(1.52 * angstrom); quantity<nanometer_unit> len3(1.52 * angstrom); quantity<angstrom_unit> len4(0.152 * nanometer); // These three calls are OK, nanometer quantity is passed showBondLength(0.152 * nanometer, cout); showBondLength(len1, cout); showBondLength(len3, cout); // Explicit casts to nanometer are OK for angstrom quantities... // but yuck showBondLength( (quantity<nanometer_unit>)(1.52 * angstrom), cout ); showBondLength( (quantity<nanometer_unit>)len2, cout ); showBondLength( (quantity<nanometer_unit>)len4, cout ); // These all (used to) fail to compile before templated version was added. // Users want implicit conversion here from angstroms to nanometers showBondLength(1.52 * angstrom, cout); showBondLength(len1, cout); showBondLength(len2, cout); showBondLength(len3, cout); showBondLength(len4, cout); // Conversion from meters works too showBondLength(3.0 * si::meters, std::cout); // Non-length quantities correctly fail to compile // showBondLength(3.0 * si::seconds, std::cout); return 0; } /* =================================== */

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[boost] compose ArgumentPacks using a comma
by er 05 Mar '09

05 Mar '09

Hi All, I have a structure containing a fusion sequence which is constructed recursively. BOOST_PARAMETER_KEYWORD(tag,kwd_struct) // This element depends on others, hence fetches the structure elem_x(const Args& args){ ...args[kwd_struct]...; } structure(Args const& args) :elements_( make_elements( ((kwd_struct = (*this)),args) ) ) {}; error: in constructor elem_x(const Args&) [with Args = ...] no match for operator[] in args[kwd_struct] If I reverse the order of the arguments (args,(kwd_struct = (*this))) it compiles. Why the discrepancy?

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[accumulator] extract_result during initialization
by er 05 Mar '09

05 Mar '09

Hi All, I have an accumulator (a) that takes an initial value (x_), and another (b), whose initial value (x_) depends on that of (a). I would have thought that this is feasible because accumulator_set initializes (a) before (b), but apparently b.x_ is initialized with a garbage value. namespace impl { template<typename Sample,typename Id> class accu_a_impl : public accumulator_base { public: typedef Sample result_type; template<typename Args> accu_a_impl(Args const &args) :x_( args[kwd<Id>::value] ) { } result_type result(dont_care) const { return x_; } private: result_type x_; }; } namespace tag { template <typename Id = mpl::void_> struct accu_a : depends_on<> { typedef accumulators::impl::accu_a_impl<mpl::_1,Id> impl; }; } namespace impl { template<typename Sample,typename Id0,typename Id1> class accu_b_impl : public accumulator_base { typedef tag::accu_a<Id1> a_type; public: typedef Sample result_type; template<typename Args> accu_b_impl(Args const &args) :x_( extract_result<a_type>(args[accumulator]) // faulty? ) { } template<typename Args> void operator ()(Args const &args) { // overrides initialization for the sake of testing x_ = extract_result<a_type>(args[accumulator]); } private: result_type x_; }; } namespace tag { template <typename Id0,typename Id1=mpl::void_> struct accu_b : depends_on<tag::accu_a<Id1> > { typedef accumulators::impl::accu_b_impl<mpl::_1,Id0,Id1> impl; }; } *.cpp typedef mpl::size_t<0> id0; typedef mpl::size_t<1> id1; typedef double value_type; typedef tag::accu_a<id0> a_type; typedef tag::accu_b<id1,id0> b_type; typedef accumulator_set< value_type, stats< b_type > > set_type; set_type set( ( kwd<id0>::value = 0.9 ) ); std::cout << "a.x_=" << extract_result<a_type>(set) << std::endl; std::cout << "b.x_=" << extract_result<b_type>(set) << std::endl; set(0); std::cout << "b.x_=" << extract_result<b_type>(set) << std::endl; //Output: //a.x_=0.9 //b.x_=0.1 // where 0.9 is expected //b.x_=0.9

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[statechart] StopWatch aborts on context<StopWatch>()
by jeti 05 Mar '09

05 Mar '09

hi all im pretty sure i just dont understand what context<>() really does and how it works reading the docs/tutorial doesnt seem to help me so, can someone point me to a documentation for boost::statechart and how to get a Pointer/Reference to the currents state_machine from a simple_state? what do i have to keep in mind? just to give an example: if i add the following line in the boost/libs/statechart/examples/StopWatch/StopWatch.cpp file Running() : startTime_( std::time( 0 ) ) { context<StopWatch>(); // <<< added } it compiles and abort's if i try to start the stopwatch i dont understand why? the state_machine is initialized and even the docs say in its comments that i can use it to get the statemachine http://www.boost.org/doc/libs/1_38_0/libs/statechart/doc/tutorial.html#Stat… but im sure i just miss something any help on this would be great thanks in adavance

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[signals2] Usage (lifespan) question
by Nat Goodspeed 05 Mar '09

05 Mar '09

I'd like suggestions for an API designed around Boost.Signals2. This isn't performance-critical. Assume a publish class containing a boost::signals2::signal. This class's listen() method is a thin wrapper around signal::connect(). Using boost::bind, I can listen() with any method (with appropriate signature) on any class. I'm trying to introduce the concept of filter objects. Each filter is itself a publish object. Client logic composes a chain from some publish object through zero or more filters to the ultimate listener. A filter passes along to its own listeners some subset of the input notifications. The central issue is the lifespan of a filter object. I want the filter objects in such a chain implicitly freed when the ultimate listener disconnects. Approach 1 ========== I could achieve that by managing each filter object with shared_ptr, storing a copy in each listener. When the last listener is destroyed, the filter goes away. (This assumes passing weak_ptr to boost::bind() so the connection itself doesn't keep the listener alive. Further assume I've used connection::track() so that the signal to which the filter is connected implicitly disconnects.) Naturally this effect cascades "upstream" through the filter chain. But it bothers me that such an implementation imposes new requirements on each listener. Beyond declaring a method with the right signature, the listener must now store a shared_ptr to the publish object to which it's listening. That implies a method on the listener to capture the shared_ptr and establish the connection. Therefore, every listener must be derived from some particular base class, and explicit connection and disconnection must be done through the listener rather than directly through the publish object. Either this new inverted API must apply to all publishers/listeners, or client logic must distinguish between the case of connecting to a filter and connecting to any other type of publish object. It feels to me as though this approach has gone into the weeds. Approach 2 ========== Instead of passing a filter's weak_ptr to boost::bind() to the publish object's listen() method, I could instead pass the filter's shared_ptr. Now the publish object upstream from the filter is responsible for the filter's lifespan: when the filter explicitly disconnects, it will (eventually) go away. It will not implicitly disconnect because it won't go away as long as the connection still holds a copy of its shared_ptr. (Frank says[1] he might tweak the library to forget a shared_ptr immediately on disconnect, but currently it survives for a while.) Consider a chain: A is the original publish object B is a filter listening to A C is the ultimate listener, listening to B Again, the goal is to disconnect B (thus deleting it) when C disconnects or is destroyed. We could make B store its connection object to A. The question is, how would B know to disconnect it? How could B become aware of C disconnecting from B's signal object? Approach 3-n ============ Suggestions? Thanks! [1] http://www.nabble.com/Re%3A--signals2--review--The-review-of-the-signals2-l…

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[Serialization] Load an object from the base pointer
by Ryan Fowler 05 Mar '09

05 Mar '09

Hi, How can I read in a from a stream when I don't know the exact type I will be getting? All objects I receive will derive from the same base class, but I won't know when I receive the stream what the derived type will be and therefore I can't create it in advance (like in the docs). class base { ... } class derived1 : public base { ... } class derived2 : public base { ... } int main() { // Get a stream from somewhere boost::archive::binary_iarchive ia( instream ); base b0; derived1 d1; derived2 d2; is >> // derived1 or derived2??? } Ryan Fowler Software Engineer Thomson Reuters Phone: +442075427063 ryan.fowler(a)thomsonreuters.com thomsonreuters.com This email was sent to you by Thomson Reuters, the global news and information company. Any views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of Thomson Reuters.

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Microsoft compiler bug: Boost 1.38 smart pointers + CLI = crash
by Oleg Golosovskiy 05 Mar '09

05 Mar '09

I have added a new bug to connect.microsoft.com. I can send the sample project if anybody needs it. https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?Feedb… Type Bug ID 420897 Status Active Access Restriction Public Opened By OlegGL Blocking Issue No Opened 3/5/2009 Submission Language English ------------------------------------------------------------------------ *Description * The problem looks identical to one described in bug #101889. http://connect.microsoft.com/VisualStudio/feedback/Workaround.aspx?Feedback… There is only one difference - intrusive_ptr instead of shared_ptr originally reported in #101889 The code bellow causes assertion: boost::intrusive_ptr<test_ptr> ptr; if(ptr) assert(false); //MUST NOT HAPPEN BUT IT DOES! Reproduced on VS2005 SP1 and VS2008 SP1 (Windows XP SP2) Boost 1.38 To reproduce the problem, the Boost (booost/smart_ptr.hpp in our case) shall be included in the CLI-compiled file under #pragma managed (push,off) (see the code below) If changed to "#pragma managed (push,on)", then everything is fine Product Language English Version Visual Studio 2008 SP1 Operating System Windows XP Professional Operating System Language English *How to reproduce: *Create any native win32 C++ project, for example a console based. int _tmain(int argc, _TCHAR* argv[]) { do_test(); return 0; } 1) Install and compile BOOST 1.38 2) Add a new CPP file to the project. This file has a minimal intrusive pointer "environment" and a code check. The Code is below. 3) Set /clr option for that particular file (Common Language Runtime Support in the Options) 4) build the project #include "stdafx.h" #include "test3_dll.h" #pragma managed (push,off) #include "boost/smart_ptr.hpp" class intrusive_ptr_base1 { friend void intrusive_ptr_add_ref(intrusive_ptr_base1*); friend void intrusive_ptr_release(intrusive_ptr_base1*); size_t m_ref_counter; void add_ref() { ++m_ref_counter; } void release() { if (--m_ref_counter == 0) delete this; } protected: intrusive_ptr_base1() : m_ref_counter(0) {} virtual ~intrusive_ptr_base1() {} intrusive_ptr_base1(intrusive_ptr_base1 const &) :m_ref_counter(0) {} intrusive_ptr_base1 &operator=(intrusive_ptr_base1 const &) { return *this; } }; inline void intrusive_ptr_add_ref(intrusive_ptr_base1* e) { e->add_ref(); } inline void intrusive_ptr_release(intrusive_ptr_base1* e) { e->release(); } class test_ptr : public intrusive_ptr_base1 { }; #pragma managed (pop) void do_test() { boost::intrusive_ptr<test_ptr> ptr; if(ptr) assert(false); } Actual Results if(ptr) returns true for the empty ptr! Expected Results if(ptr) must return false for the empty ptr TAP Code (if applicable)

2 1

[boost::program_options] Different usage
by Everton Patitucci 05 Mar '09

05 Mar '09

Hello, I'm wondering if I should use boost::program_options and I got some questions about it. All examples that I found are using std::string and std::ostream everytime they're dealing with values being some kind of text... so to display the "usage" of their program they would do something like... cout << desc; 'desc' being a boost::program_options::options_description. or... when adding options to their command line... desc.add_options() ... ("opt", boost::program_options::value<std::string>, "desc") ... What I want to know is, if I didn't want to use std::string nor std::ostream nor std anything in my specific code (I know boost uses it). Is there a not-so-time-expensive way to do it? If there's could someone show me (there's no need for the real code, pseudo is more than OK) if it's supported? something like this for example... desc.add_options() ("opt", bpo::value<char*>, "blabla") and in usage()-like: I don't know if this works, I looked in doc... std::vector< shared_ptr<po::option_description> > opts = desc.options(); std::vector< shared_ptr<po::option_description> >::iterator it = opts.begin(); for (; it != opts.end(); ++it) { shared_ptr<po::option_description> opt = *it; printf("%s\n", opt->format_parameter().c_str()); } Patuti

2 1

[asio] serial port howto?
by Markus Werle 05 Mar '09

05 Mar '09

Hi! For first time users of asio it is not easy to get things started. I found a demo application (minicom_client) on the web, but it uses a raw io_service. In the reference docs I found serial_port_service. What is the difference? Can I use serial_port_service as a drop in replacement where an io_service normally is used? Is there any small example how to use all this? best rgards, Markus

2 1

[boost::mpl][boost::variant]
by Naveen Santhanam 05 Mar '09

05 Mar '09

Hello, I can't get the attached example to compile, using MS VC 8.0 and boost_1_35_0, when I uncomment the comment lines in the code. Can some one help me in finding what's wrong? A brief description: The code contains a class that has a variant as a member and a visitor that creates types of the variant. Thanks in advance

2 2

Boost thread priority
by Andrei VANCEA 05 Mar '09

05 Mar '09

Hello! I want to set the priority of a boost thread. It seems that this feature is not (yet) implemented and the only option is to go to lower level (pthread in my case). The documentation says that the method native_handle() should return the handler of the associated pthread. The problem is that this method no longer exists (for the pthread implemention; it is there for the win32 version). Anyone knows how to get the pthread handler of a boost thread (I'm using the 1.35 vesion) -- Andrei Vancea

2 1

Re: [Boost-users] [auto_link] Using MSVC 2005 (VC8)
by dhruva 05 Mar '09

05 Mar '09

Apologize for the false alarm, I was using CMake generated files to build. After making cnahes in the CMake file, I had missed regenerating the MSVC build files... Everything's fine and it works at it always does :) -dhruva ----- Original Message ---- > From: dhruva <dhruva(a)ymail.com> > To: BOOST users <boost-users(a)lists.boost.org> > Sent: Thursday, 5 March, 2009 12:04:41 PM > Subject: [auto_link] Using MSVC 2005 (VC8) > > Hi, > I have built boost 1.38 using MSVC 2005 using "--layout=system link=static". > That has resulted in libraries with the following name convention. > > libboost_system-mt.lib > libboost_date_time-mt.lib > > Auto link triggers in even if I define BOOST_ALL_NO_LIB. I searched through the > all of BOOST headers in my install folder for BOOST_ALL_NO_LIB and found it only > in a comment in boost/config/user.hpp > > Would that define really disable auto-link? > > -dhruva > > > > Check out the all-new Messenger 9.0! Go to http://in.messenger.yahoo.com/ Check out the all-new Messenger 9.0! Go to http://in.messenger.yahoo.com/

1 0

[auto_link] Using MSVC 2005 (VC8)
by dhruva 05 Mar '09

05 Mar '09

Hi, I have built boost 1.38 using MSVC 2005 using "--layout=system link=static". That has resulted in libraries with the following name convention. libboost_system-mt.lib libboost_date_time-mt.lib Auto link triggers in even if I define BOOST_ALL_NO_LIB. I searched through the all of BOOST headers in my install folder for BOOST_ALL_NO_LIB and found it only in a comment in boost/config/user.hpp Would that define really disable auto-link? -dhruva Check out the all-new Messenger 9.0! Go to http://in.messenger.yahoo.com/

1 0

BoostCon '09 Sessions
by David Abrahams 05 Mar '09

05 Mar '09

Hartmut Kaiser and the BoostCon Program committee have done a stellar job assembling a list of sessions for this year's BoostCon, including everything from C++ compiler developer presentations, to hands-on C++0x development, to talks on eexperimental metaprogramming enhancements, to expression templates for running code on GPUs. I can honestly say I want to go to almost every session. It's going to be hard to choose. Please see the session list at: http://www.boostcon.com/program/sessions and then, of course, head on over to http://www.boostcon.com/registration to register for the conference. Best regards to all. See you there! -- Dave Abrahams BoostPro Computing http://www.boostpro.com

1 0

[iostreams] with compression filters?
by Mikko Vainio 05 Mar '09

05 Mar '09

Dear boosters, I'm trying to compile IOStreams from 1.38.0 with bzip2 compression enabled on windows. The docs say "you will need to set variables indicating the location of the source files". Setting boost.build variables in user-config.jam doesn't seem to do the trick. Providing "-s|BZIP2_SOURCE|=..." or any of the other related variables or combinations thereof on the command line for bjam does not help. Does anyone out there have an example on how to do this exactly? I suggest such an example to be added to the documentation. Or is this a bug in the build system? Regards, Mikko

3 5

bind member function of a member of a class...
by Archie14 05 Mar '09

05 Mar '09

I cannot figure out how to use boost::bind in following scenario: class A { int i_; public: int test() {return i;} }; class B { A _a; public: A& getA() {return _a;} } bool testbind() { B b; // here I am trying to find out if b.getA().test() equals 1 // I understand that B::getA::test is incorrect, and that's my question- // how to use bind here? return (boost::bind (&B::getA::test, b) ==1); }

3 4

Re: [Boost-users] Boost-users Digest, Vol 1924, Issue 10
by Rob Currey 04 Mar '09

04 Mar '09

> From: "Peter Dimov" <pdimov(a)pdimov.com> > Subject: Re: [Boost-users] [enable_shared_from_this] My derivation > ofenable_shared_from_this wants to be templated >> template<class X> >> class Y: public enable_shared_from_this< Y<X> > >> { >> public: >> >> shared_ptr< Y<X> > f() >> { >> return shared_from_this(); > > In a template, you need > > return this->shared_from_this(); > > to inform the compiler that shared_from_this will come from a base class. > >> } perfect ... thank you.

1 0

Calling date_time time_input_facet directly
by Jeffery Cavallaro 04 Mar '09

04 Mar '09

I have to parse a leading timestamp in a bunch of records, and I would like to avoid having to copy each record into a stringstream just to parser the timestamp. Does anyone know how to call the date_time time_input_facet directly? I did something like the following: char buffer[N]; typedef boost::date_time::time_input_facet<boost::posix_time::ptime, char, char *> TimeFacet; TimeFacet *f = new TimeFacet; boost::posix_time::ptime t; f->get(buffer, buffer + size, ???, t); But I don't know what to pass for the 3rd arg, which is an ios_base &. I tried an ios instance and a stringstream instance, but I couldn't get anything to work - the compiler can't seem to match the call. -- Jeffery Cavallaro, MTV-45-208G Infrastructure Engineering Google Inc. 1600 Amphitheatre Parkway Mountain View, CA 94043 650-214-2552

1 0

VS 2008 Link1104 Error
by Mantas Matelis 04 Mar '09

04 Mar '09

Hello everyone, I've just built the boost libraries and I'm trying to get visual studio 2008 to properly recognize the libraries. The library that the linker is looking for is in C:\development\boost\build\boost\bin.v2\libs\filesystem\build\msvc-9.0\debug\link-static\threading-multi\libboost_filesystem-vc90-mt-gd-1_38.lib Even though I've added C:\development\boost\build\boost\bin.v2\libs to the extra libraries vc++ global setting. Error Message: 1>LINK : fatal error LNK1104: cannot open file 'libboost_filesystem-vc90-mt-gd-1_38.lib' If I add C:\development\boost\build\boost\bin.v2\libs\filesystem\build\msvc-9.0\debug\link-static\threading-multi to the project extra library setting though, the program compiles and links properly. On MSDN, http://msdn.microsoft.com/en-us/library/ts7eyw4s.aspx I've seen nothing that I think applies to me. So, what do I do?

3 4

Re: [Boost-users] re alization of Last Recently Used cache with boost::multi_index
by Joaquin M Lopez Munoz 04 Mar '09

04 Mar '09

Hi Pavel, pavel5 wrote: > > I am trying to realize class for strings caching using boost::multi_index. > [...] > My class works without any problem, but i want to have template class, for > easily type of key and value selection. I modified my source: > [...] > After modification, gcc compiler prints for line: > > LRUCacheItems::nth_index<0>::type& hash_index=cache.get<0>(); > > many errors:[...] > Replace the offending line with typename LRUCacheItems::nth_index<0>::type& hash_index=cache.template get<0>(); Note the extra "typename" and also the "template" keyword between "cache." and "get<0>()". After templatizing your LRUCache, the expression happens to be in a so-called dependent context, and turns out you've got to help the compiler figure it out right (i.e. disambiguate from some other interpretations theoretically possible in the given context). Learn more about this issue at http://www.informit.com/guides/content.aspx?g=cplusplus&seqNum=388 Hope this helps, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo -- View this message in context: http://www.nabble.com/realization-of-Last-Recently-Used-cache-with-boost%3A… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

boost::bind used with boost shared_ptr
by Kevin Ludwig 04 Mar '09

04 Mar '09

Hi, I've recently been making more use of boost::bind, and I coded the following, which I thought would work: class A { public: void reset () {} }; typedef std::map<int, boost::shared_ptr<A> > map_type; map_type m; std::for_each (m.begin(), m.end(), boost::bind(&A::reset, boost::bind(&map_type::value_type::second, _1))); but fails to compile. Next I tried this: std::for_each (m.begin(), m.end(), boost::bind(&A::reset, boost::bind(&boost::shared_ptr<A>::get, boost::bind(&map_type::value_type::second, _1)))); Which works and is fine (I guess). I just wonder why the first syntax is not supported? boost::shared_ptr is supposed to behave like a pointer (and here it seems that it does not). -- Kevin

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[enable_shared_from_this] My derivation of enable_shared_from_this wants to be templated
by Rob Currey 04 Mar '09

04 Mar '09

Here's some code based upon the example at : http://www.boost.org/doc/libs/1_38_0/libs/smart_ptr/enable_shared_from_this… class X { public: X() { }; }; template<class X> class Y: public enable_shared_from_this< Y<X> > { public: shared_ptr< Y<X> > f() { return shared_from_this(); } }; typedef Y<X> templatedY; int main() { shared_ptr<templatedY> p(new Y<X>); shared_ptr<templatedY> q = p->f(); assert(p == q); assert(!(p < q || q < p)); // p and q must share ownership } compiles with: $ gcc -o test -I/usr/local/include/boost-1_38 -lstdc++ -L/usr/local/lib -lboost_system-gcc41-mt test.cpp test.cpp: In member function âboost::shared_ptr<Y<X> > Y<X>::f()â: test.cpp:13: error: there are no arguments to âshared_from_thisâ that depend on a template parameter, so a declaration of âshared_from_thisâ must be available test.cpp:13: error: (if you use â-fpermissiveâ, G++ will accept your code, but allowing the use of an undeclared name is deprecated) Any resolution (other than the -fpermissive hack) TIA (my skilz with shared_ptr<> are somewhat lacking ...)

2 1

[iterators ]bug?
by bismuth＠list.ru 04 Mar '09

04 Mar '09

There is probably a bug in boost::iterators library. boost::transform_iteartor degrade stl iterator_category. There is a code below, illustrating a problem(using VS2008 c++ compiler): --------------------- #include <stdio.h> #include <tchar.h> #include <vector> #include <boost/iterator/transform_iterator.hpp> #include <boost/static_assert.hpp> struct Tr1: std::unary_function<unsigned, unsigned> { unsigned operator()(unsigned a)const { return a; } }; int _tmain(int argc, _TCHAR* argv[]) { typedef std::vector<unsigned>::iterator some_ra_iterator_t; typedef boost::transform_iterator<Tr1, some_ra_iterator_t> tr_iter_t; BOOST_STATIC_ASSERT (( boost::is_convertible < std::iterator_traits<some_ra_iterator_t>::iterator_category, std::random_access_iterator_tag >::value )); BOOST_STATIC_ASSERT (( ! boost::is_convertible < std::iterator_traits<tr_iter_t>::iterator_category, std::random_access_iterator_tag >::value )); BOOST_STATIC_ASSERT (( boost::is_same < std::iterator_traits<tr_iter_t>::iterator_category, boost::detail::iterator_category_with_traversal < std::input_iterator_tag, //?! boost::random_access_traversal_tag > >::value )); return 0; } ---------------------

2 1

[Graph] edge_range() with hash_setS as OutEdgeList in adjacency_list
by Ignacy Gawedzki 04 Mar '09

04 Mar '09

Hi, The following issue seems to have been discussed on this list a while ago, but nothing seems to have changed since and I was usable to find a proper answer so far. The edge_range() function uses std::equal_range() to extract a pair of iterators to the edges of interest. The problem lies in the fact that according to the SGI STL documentation, std::equal_range() requires the entries to be sorted (although I found no explicit mention of that in the standard). With hash_setS as OutEdgeList in adjacency_list, the entries are obviously not sorted, and std::equal_range() must not be used. While it's easy to write an edge_range_custom() function that would call the equal_range() method instead of the global function, nothing can be done to prevent the use of the original edge_range() by other library code like bidirectional_graph_helper_with_property::get_parallel_edge_sublist(). These overloaded methods are called from within remove_edge() which apparently causes trouble with hash_setS. I tried myself to overload the original edge_range(), for the case where hash_setS is used, but the solution is far from elegant and it feels like something be better done upstream. What do you think about that? Shouldn't the equal_range() method be used directly instead of std::equal_range() in any case? Thanks for your help. Ignacy -- /* This is not a comment */

1 0

workaround ideas?
by Noah Roberts 04 Mar '09

04 Mar '09

This may be a little OT but as it applies to metaprogramming and ideas from the book I thought it the best place to ask. On pgs 191/2 of the MPL book (section 9.5) is a set of ideas meant to introduce the inherit_linearly metafunction. There are some things I want to do that suggested this was actually the better way to go for me. So I implemented something like the following: struct empty {}; template < typename FIELD, typename CDR > struct rec : CDR { typename FIELD::type value; rec() : value() {} }; template < typename VEC > struct generate_record //: boost::mpl::inherit_linearly< VEC, boost::mpl::inherit< rec<pl::_2>, pl::_1> >::type : boost::mpl::fold< VEC, empty, rec< pl::_2, pl::_1> > {}; I implemented a getter function like so: template < typename FIELD, typename CDR > typename FIELD::type & get(rec< FIELD, CDR > & r) { return r.value; } Now, minus the "field" concept this seems to be exactly the same basic thing. The field concept is something I need for what I'm working on that currently, for this test, just has a type in it. I create a "record" like so: typedef generate_record< boost::mpl::vector<field1, field2, field3> >::type test_record; When I print the type I end up with: "rec<field3,rec<field2,rec<field1,empty> > >" and in main attempt to access it: test_record tr; get<field1>(tr) = 3; This works fine in comeau and I'd expect it to work anywhere but MSVC++ 8 doesn't like it. It says that the FIELD param is ambiguous and could be field1 (what I specified in the call) or field3 (the first field on the inheritance tree). The error text is exactly: 1>e:\dev_workspace\experimental\record_generation\record_generation\main.cpp(78) : error C2782: 'FIELD::type &get(rec<FIELD,CDR> &)' : template parameter 'FIELD' is ambiguous 1> e:\dev_workspace\experimental\record_generation\record_generation\main.cpp(58) : see declaration of 'get' 1> could be 'field3' 1> or 'field1' I'm calling this a compiler bug at this point. I suspect many here have had to deal with this, since it's basic template usage, and might know a workaround. Or maybe you see something I've done incorrectly.

2 4

boost logging or tracing library?
by Archie14 04 Mar '09

04 Mar '09

I was wandering - is there any support in boost for logging or tracing? If not, may be you can offer suggestions for the library that had been successfully used in production?

2 1

uploaded Channel - a lib for (distributed) message passing and event dispatching to boost vault
by Yigong Liu 04 Mar '09

04 Mar '09

Hello there, I just upload a updated version of my Channel library to Vault under Main/"Distributed Computing". This version contains some update for Channel to work with the latest boost distributions and change to boost license, since there are several requests for me to update and upload to Vault. A brief description: Channel procides name space for distributed message passing and event dispatching. Its major components (message IDs, routing algorithms...) are configurable as template parameters. As a namespace shared by peer threads, channels support publish/subscribe scope control, message filtering, and translation.. Thanks Yigong

1 0

[asio] sync receive_from with timeout
by Stephan Menzel 04 Mar '09

04 Mar '09

Is the subject Jehova enough for you? ;-) Great. Well, I haven't raised the subject so far but I'd certainly like to do so now. For years now I am not only a user but also an admirer of boost asio. Something that has always puzzled me however is, why a timeout functionality which is something very common and essential for sync IO just doesn't seem to be there. I think there are cases where syncronous IO is a better way to go and no async approach is sensible. In my case this is a collection of static functions that do UDP communication and therefore have to be sync because I just want them to be able to return and throw exceptions and be able to be called from anyone at any time. As always when I stumble across the asio/timeout problem I start googling around. When people raise the topic here they are usually pointed to an answer Chris Kohlhoff gave to someone asking that: http://lists.boost.org/Archives/boost/2007/04/120339.php ... which is good for tcp and works alright even though in my opinion it leaves the question why it has to be so compilicated to do something so basic. IMHO sync IO is all but pointless without a timeout. Anyway, I started to turn this into a UDP version and ended up with something very similar: inline void set_result(boost::optional<boost::system::error_code>* a, boost::system::error_code b) { a->reset(b); }; template <typename MutableBufferSequence> void udp_read_with_timeout(boost::asio::ip::udp::socket& sock, int tmo, boost::asio::ip::udp::endpoint &endpoint, const MutableBufferSequence& buffers) { boost::optional<boost::system::error_code> timer_result; boost::asio::deadline_timer timer(sock.io_service()); timer.expires_from_now(boost::posix_time::seconds(tmo)); timer.async_wait(boost::bind(set_result, &timer_result, _1)); boost::optional<boost::system::error_code> read_result; sock.async_receive_from(buffers, endpoint, boost::bind(set_result, &read_result, _1)); sock.io_service().reset(); while (sock.io_service().run_one()) { if (read_result) timer.cancel(); else if (timer_result) sock.cancel(); } if (*read_result) throw boost::system::system_error(*read_result); }; So now I started to go ahead with that but I had to notice two things. First, the performance impact is massive to a point that forces me to reconsider. Second, when I use that in a multithreaded environment the whole thing seems to block in some threads randomly. I have made test program where I have multiple threads using that method, just sending an UDP request to a server and waiting for an answer using this function. In one thread everything is slow but continously running. In more than one thread it blocks for up to 5 or 6 seconds every few (10-20) runs for no visible reason. In my scenario all those threads share a socket protected by a mutex so if one of them blocks all will be halted. So I come to think this is not a good way to handle the problem. Does anyone have some thoughts on that? May this be a bug in asio (1.38) or perhaps in my function? Or is there a better way to do sync UDP IO with a timeout functionality? Cheers... Stephan

3 12

BGL: is it safe to store vertex_descriptors?
by Cory Riddell 04 Mar '09

04 Mar '09

Is it safe to store vertex descriptors? Does adding a new vertex / edge ever renumber existing vertices? (I know removing does this) Say I have a class to represent a state from the USA. class State { ... }; and I have a bunch of instances: State california, oregon, nevada, hawaii, ...; I want a graph with a vertex for each state and an edge for each border: typedef adjacency_list<vecS, vecS, bidirectionalS> Graph; Graph graph; I build my graph like this: Graph::vertex_descriptor v_california = add_vertex(graph); Graph::vertex_descriptor v_oregon = add_vertex(graph); Graph::vertex_descriptor v_nevada = add_vertex(graph); Graph::vertex_descriptor v_hawaii = add_vertex(graph); ... add_edge(v_california, v_oregon, graph); add_edge(v_california, v_nevada, graph); add_edge(v_nevada, v_oregon, graph); ... To associate each State instance with a vertex, I make a map: map<State, Graph::vertex_descriptor> state_to_vtx_map; state_to_vtx_map[california] = v_california; state_to_vtx_map[oregon ] = v_oregon ; state_to_vtx_map[nevada ] = v_nevada ; state_to_vtx_map[hawaii ] = v_hawaii ; Now I can find all the states Nevada has a border with by doing this: Graph::vertex_descriptor v = state_to_vtx_map[nevada]; tie(begin, end) = out_edges(v, g); (please assume that I didn't store v_nevada from above) Is my state_to_vtx_map safe? Since a delete can totally renumber everything, I don't think it is safe. What's the correct way of associating a vertex with a State instance? Thanks, Cory

1 0

Compile error with QNX compiler
by Kito Berg-Taylor 04 Mar '09

04 Mar '09

I am using the QNX 6.4.0 development environment (based on gcc 4.2.4) to compile boost_thread-static-mt from boost 1.38, and I am getting the following errors. I was wondering if someone could tell me whether this is a compiler problem or a problem with boost. I should mention that I don't get the same error with gcc4 or mingw-gcc4. I have the latest boost from svn, but I'm unable to test that on this compiler because I'm still sorting through other build problems there. cd /path_to_build/build.qnx/Core/LIB_MISSIONPLANNER && /path_to_qnx/qnx640/host/linux/x86/usr/bin/qcc -Vgcc_ntox86 -lang-c++ -w1 -I/path_to_build/Externals/boost_1_38_0 -o CMakeFiles/MISSIONPLANNER.dir/CommTCP.cpp.obj -c /path_to_build/Core/LIB_MISSIONPLANNER/CommTCP.cpp In file included from /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:33, from /path_to_build/Externals/boost_1_38_0/boost/archive/detail/iserializer.hpp:64, from /path_to_build/Externals/boost_1_38_0/boost/archive/detail/interface_iarchive.hpp:23, from /path_to_build/Externals/boost_1_38_0/boost/archive/detail/common_iarchive.hpp:20, from /path_to_build/Externals/boost_1_38_0/boost/archive/basic_text_iarchive.hpp:31, from /path_to_build/Externals/boost_1_38_0/boost/archive/text_iarchive.hpp:23, from /path_to_build/Core/LIB_MISSIONPLANNER/Connection.hpp:19, from /path_to_build/Core/LIB_MISSIONPLANNER/CommTCP.hpp:6, from /path_to_build/Core/LIB_MISSIONPLANNER/CommTCP.cpp:1: /path_to_build/Externals/boost_1_38_0/boost/serialization/factory.hpp:37: error: template declaration of 'T* boost::serialization::factory' /path_to_build/Externals/boost_1_38_0/boost/serialization/factory.hpp:37: error: 'va_list' is not a member of 'std' In file included from /path_to_build/Externals/boost_1_38_0/boost/archive/detail/iserializer.hpp:64, from /path_to_build/Externals/boost_1_38_0/boost/archive/detail/interface_iarchive.hpp:23, from /path_to_build/Externals/boost_1_38_0/boost/archive/detail/common_iarchive.hpp:20, from /path_to_build/Externals/boost_1_38_0/boost/archive/basic_text_iarchive.hpp:31, from /path_to_build/Externals/boost_1_38_0/boost/archive/text_iarchive.hpp:23, from /path_to_build/Core/LIB_MISSIONPLANNER/Connection.hpp:19, from /path_to_build/Core/LIB_MISSIONPLANNER/CommTCP.hpp:6, from /path_to_build/Core/LIB_MISSIONPLANNER/CommTCP.cpp:1: /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp: In member function 'void* boost::serialization::extended_type_info_typeid<T>::construct(unsigned int, ...) const': /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:96: error: 'va_list' is not a member of 'std' /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:96: error: expected `;' before 'ap' /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:97: error: 'ap' was not declared in this scope /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:100: error: 'factory' was not declared in this scope /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:100: error: expected primary-expression before ',' token /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:102: error: expected primary-expression before ',' token /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:104: error: expected primary-expression before ',' token /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:106: error: expected primary-expression before ',' token /path_to_build/Externals/boost_1_38_0/boost/serialization/extended_type_info_typeid.hpp:108: error: expected primary-expression before ',' token cc: /path_to_qnx/qnx640/host/linux/x86/usr/lib/gcc/i386-pc-nto-qnx6.4.0/4.2.4/cc1plus error 1 compiler identifies itself as gcc 4.2.4: kito@Vostok:~$ ntox86-g++ --version ntox86-g++ (GCC) 4.2.4

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I Can't Compile The QuickStart Example
by Fagner Patricio 04 Mar '09

04 Mar '09

Hello!! I'm new in the list, I from Brazil, so, sorry about my english :) I have a problem, I am try to compile the QuickStart Python Example on ubuntu 8.04 using the 1.34 library version, this is the result: fagner@fagner-desktop:/usr/share/doc/libboost-doc/examples/libs/python/example/quickstart$ sudo bjam toolset=gcc --verbose-teste test --debug-configuration notice: found boost-build.jam at /usr/share/doc/libboost-doc/examples/libs/python/example/quickstart/boost-build.jam notice: loading Boost.Build from /usr/share/boost-build notice: loading site-config.jam from /etc/site-config.jam notice: loading user-config.jam from /usr/share/boost-build/user-config.jam notice: using gcc libraries :: <toolset>gcc-4.2 :: /usr/bin /usr/lib /usr/lib32 /usr/lib64 notice: using gcc archiver :: <toolset>gcc-4.2 :: /usr/bin/ar warning: toolset gcc initialization: can't find tool windres warning: initialized from notice: using rc compiler :: <toolset>gcc-4.2 :: /usr/bin/as error: Unable to find file or target named error: '/boost/python//boost_python' error: referred from project at error: '.' fagner@fagner-desktop:/usr/share/doc/libboost-doc/examples/libs/python/example/quickstart$ What's my mistake? -- Fagner Patrício João Pessoa - PB Brasil

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Re: [Boost-users] Tag dispatching
by Hicham Mouline 04 Mar '09

04 Mar '09

> ----- Original Message ----- > From: "Ovanes Markarian" <om_boost(a)keywallet.com> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Tag dispatching > Date: Wed, 4 Mar 2009 14:12:09 +0100 > > Hicham, > > please see my comments below: > > On Wed, Mar 4, 2009 at 1:54 PM, Hicham Mouline <hicham(a)mouline.org> wrote: > > > Hello, > > > > I have a question about tag dispatching (for e.g. the std::advance() > > function in the std lib, as described for instance in > > http://www.boost.org/community/generic_programming.html#tag_dispatching) > > > > 1. The call to > > detail::advance_dispatch(i, n, category); > > I don't understand. category is a type not an object, it should be > > category(), right? > > > typename *iterator_traits<InputIterator>::iterator_category* category; > detail::advance_dispatch(i, n, *category*); > > here is no typedef used, so category is an instance of iterator_category. In > the template context you have to prefix it with typename keyword. Using: > > typename *iterator_traits<InputIterator>::iterator_category* category(); > > declares a function, which returns iterator_category, but does not create a > class instance. ah yes of course. I misread the typename as typedef, thanks. category is an auto instance. Can it be also written also as a temporary etail::advance_dispatch(i, n, iterator_traits<InputIterator>::iterator_category() ); > > 2. If I am correct, > > the tags are empty structs which I assume allows modern compilers > > (g++4, msvc8/9, intel) to optimize away the creation of that category > > object ? > > This is compiler dependent. ISO C++ 03 standard requires an instance of an > empty type to be at least 1 byte big. To check if that happens read the > documentation to the corresponding compiler. > > 3. If i am still correct, I have a tag which has no members except 1 static > > function that returns void. > > Would that optimization still apply? > > Applies the same as in 2. Whether the compiler prints sizeof(myType) as 1byte or something else has no bearing on whether it doesn't create an instance at runtime, right? need to read their docs (though it's quite hard to see where for g++ for e.g.) thanks very much, regards,

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[BGL] Structure for BFSvisitor is in header file (visitor & property confusion)??
by Trevor Bain 04 Mar '09

04 Mar '09

I have my graph working with BFS, and a BFSvisitor. But, I don't want the BFSvisitor to be in the header file. Since, it is, I have to declare properties I want to use in the visitor, but then I have to pass them in in the constructor for the class that contains the graph and the visitor structure ... Here is my visitor (in .hpp): /* ... other code */ /*! Structure for creating BFSvisitor * * The property maps are being assigned in the constructor for the * Ann object - I don't know how inneficient of a method that is. * i.e. if I should be using references. */ struct propagate_node : public boost::base_visitor<propagate_node> { // getting the dynamically created VoltageMap boost::property_map<Digraph, vertex_voltage_t>::type voltmap; boost::property_map<Digraph, vertex_input_t>::type inputmap; boost::property_map<Digraph, vertex_output_t>::type outputmap; typedef boost::on_discover_vertex event_filter; /* * This is a functor For Breadth First Visit. */ template <class Vertex, class Digraph> void operator()(Vertex v, Digraph& G) { boost::graph_traits<Digraph>::out_edge_iterator ed; // getting the dynamically created VoltageMap && InputMap double volt = boost::get(voltmap, v); bool in = boost::get(inputmap, v); bool out = boost::get(outputmap, v); // mapping sigmoid (don't apply sigmoid to input/output layers) if (in == false && out == false) { // justify this sigmoid ??? volt = 1/(1+pow(MYEXP,-volt)); boost::put(voltmap, v, volt); } if (v != *vertices(G).first) { for ( ed = boost::out_edges(v, G).first; ed != boost::out_edges(v, G).second; ed++) { boost::put( voltmap, target(*ed, G), get(voltmap,target(*ed,G))+get(boost::edge_weight,G,*ed)* volt); } } } } prop; /* ... other code */ So in the c'tor I have to do (in .cpp): /* ... in initializer list */ VoltageMap(get(vertex_voltage_t(), net)), InputMap(get(vertex_input_t(), net)), OutputMap(get(vertex_output_t(), net)), /* ... other code */ prop.voltmap = VoltageMap; prop.inputmap = InputMap; prop.outputmap = OutputMap; to pass my properties from the graph to the visitor ... there has to be a better way to do this. How can I put the visitor definition into the .cpp, and only declare it in the .hpp?

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Tag dispatching
by Hicham Mouline 04 Mar '09

04 Mar '09

Hello, I have a question about tag dispatching (for e.g. the std::advance() function in the std lib, as described for instance in http://www.boost.org/community/generic_programming.html#tag_dispatching) 1. The call to detail::advance_dispatch(i, n, category); I don't understand. category is a type not an object, it should be category(), right? 2. If I am correct, the tags are empty structs which I assume allows modern compilers (g++4, msvc8/9, intel) to optimize away the creation of that category object ? 3. If i am still correct, I have a tag which has no members except 1 static function that returns void. Would that optimization still apply? regards,

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Unhandled exception at 0x781451eb in ********.exe: 0xC0000005: Access violation reading location 0x0129ffff.
by ddribes 04 Mar '09

04 Mar '09

Dear Boost Users, I am new with Boost and I am facing a Unhandled exception. The program I am triying to use is working fine in release mode but crashing in debug mode. Maybe compiler options are not set correctly. Is there something specific for release and/or debug version ? Something to diseable exceptions ? I am working with VStudio 8. I've set the same compiler options for both but I still have the same error. Any ideas ? Thanks, -- View this message in context: http://www.nabble.com/Unhandled-exception-at-0x781451eb-in-********.exe%3A-… Sent from the Boost - Users mailing list archive at Nabble.com.

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[boost-users][bind] binding std::for_each
by Igor R 04 Mar '09

04 Mar '09

Hello, I'd like to bind std::for_each with some other functor created on the fly, like this: struct A { void f(int, int); }; vector<shared_ptr<A> > vec; void f(function<void(void)>); // I want to call f() with a functor that would call A::f for every element in vec f(bind(&for_each, vec.begin(), vec.end(), bind(&A::f, _1, 1))); // doesn't compile f(bind(&for_each, vec.begin(), vec.end(), protect(bind(&A::f, _1, 1)))); // also doesn't compile Thank you.

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1.38 build cmake error
by Randy Heiland 04 Mar '09

04 Mar '09

Hello, Just downloaded 1.38 and trying to use the cmake build. I get my CMakeCache.txt setup the way I want, then: cmake . make sudo make install ... -- Installing: /usr/local/include//boost/xpressive/xpressive_static.hpp -- Installing: /usr/local/include//boost/xpressive/xpressive_typeof.hpp CMake Error at libs/preprocessor/cmake_install.cmake:31 (FILE): file INSTALL cannot find file "/Users/heiland/dev/boost_1_38_0/libs/preprocessor/include/boost" to install. Call Stack (most recent call first): libs/cmake_install.cmake:32 (INCLUDE) cmake_install.cmake:37 (INCLUDE) and sure enough, there's no .../preprocessor/include... heiland@Macintosh:~/dev/boost-build$ ls /Users/heiland/dev/ boost_1_38_0/libs/preprocessor CMakeLists.txt doc/ index.html module.cmake test/ Suggestions? OSX 10.5.6 cmake version 2.6-patch 2 thanks, Randy

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Including a source library with Boost.Build
by Z. S. O. 04 Mar '09

04 Mar '09

I have a source library I'd like to include in my Boost.Build project. The library consists of an assortment of header and cpp files in a folder next to the main cpp file and jamfile. It doesn't require any elaborate precompilation, so it should work just by #including the appropriate header files in the main cpp file (i.e., #include "FolderName/FileName.h"). My question is, do I need to do anything other than that to make this work? I'm getting an "undefined symbols" error, so clearly Boost.Build not finding something correctly.

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boost.serialization, asio and iostreams...
by Hajo Kirchhoff 04 Mar '09

04 Mar '09

(forwarded from asio.user as serialization questions might be more appropriate here) Hi all, I plan to use serialization and asio together to exchange 'command objects' between two applications. Basically marshalling an object and sending it to a remote application. There is a simple asio example using serialization, but there are two issues I'd like to improve. [1] I am concerned about performance. The example constructs and destructs an archive for every single object and uses stringstream, which creates and copies a string object. Wouldn't using asio::tcp::iostreams give better performance? and [2]: I would like to utilize the boost.serialize class registration system to allow peer programmers to create new objects. In the example I would need to send a 'type' and the size manually in a 'header' before I serialize and send the actual object. That would require a system wide enumeration or other 'type' mechanism. My idea is to require all objects be derived from a common polymorphic base and then serialize a pointer to the object. The archive would serialize the entire object and also send type information with it, so the receiver could reconstruct the object simply by receiving a pointer. class basic_command; class my_command:public basic_command; On the senders side: my_command dosomething; archive << &dosomething; On the receiver side: basic_command *next_command; archive >> next_command; next_command->execute(); This would have the benefit that new commands could simply be created by deriving from basic_command. It might also have performance consequences and I have one specific question: For this in order to work I would need to disable tracking for 'my_command'. Otherwise only the very first instance of archive << &dosomething would actually send something. Question: Can I 'reset' the binary archive such that the tracking information is reset, but not the type information? Or can I temporarily disable tracking for a class or for the next save/load operation? I don't want to globally disable tracking for my_command, because I cannot rule out that someone might actually want tracking for their object in a different archive (such as saving settings to disk). I'd love to hear from you and any comments are welcome. Has anyone already done this? What are your experiences? Regards Hajo

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[Units] implicit conversion of quantities
by Christopher Bruns 03 Mar '09

03 Mar '09

Kudos on the excellent implementation of the Boost.Units library. I am also very grateful for the extremely timely help I have got in the past from the principal authors Matthias Schabel and Steven Watanabe. Is there any way to force implicit conversion of Angstrom quantities to nanometer quantities in assignment and method calls using Boost.Units? I would appreciate any suggestions on how to get the final three method calls in the attached program to compile. I suppose I could overload the showBondLength() method in this example to take both types. I think I would prefer implicit conversion, if that is possible. I am using boost from subversion revision 51579, from March 3, 2009. --Chris Bruns /* =========== begin test program ========== */ #include <boost/units/systems/si.hpp> #include <boost/units/base_units/metric/angstrom.hpp> #include <iostream> namespace boost { namespace units { typedef metric::angstrom_base_unit::unit_type angstrom_unit; BOOST_UNITS_STATIC_CONSTANT(angstrom, angstrom_unit); typedef scaled_base_unit< si::meter_base_unit, scale<10, static_rational<-9> > > nanometer_base_unit; typedef nanometer_base_unit::unit_type nanometer_unit; BOOST_UNITS_STATIC_CONSTANT(nanometer, nanometer_unit); } } // namespace boost::units // No permutation of BOOST_UNITS_DEFAULT_CONVERSION macro has // *ever* had a measurable effect in my hands BOOST_UNITS_DEFAULT_CONVERSION( boost::units::angstrom_unit, boost::units::nanometer_unit ); using namespace boost::units; using namespace std; ostream& showBondLength( quantity<nanometer_unit> len, std::ostream& os) { os << len << endl; return os; } int main() { // These constructors all work; conversions are automatic quantity<nanometer_unit> len1( 0.152 * nanometer ); quantity<angstrom_unit> len2( 1.52 * angstrom ); quantity<nanometer_unit> len3( 1.52 * angstrom ); quantity<angstrom_unit> len4( 0.152 * nanometer ); // These three calls are OK, nanometer quantity is passed showBondLength(0.152 * nanometer, cout); showBondLength(len1, cout); showBondLength(len3, cout); // Explicit casts to nanometer are OK for angstrom quantities... // but yuck showBondLength( (quantity<nanometer_unit>) (1.52 * angstrom), cout ); showBondLength( (quantity<nanometer_unit>) len2, cout ); showBondLength( (quantity<nanometer_unit>) len4, cout ); // These all fail to compile. Users want implicit conversion here showBondLength(1.52 * angstrom, cout); showBondLength(len2, cout); showBondLength(len4, cout); } /* =========== end test program =========== */

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[regex] Context-sensitive replacement of text using regex_replace
by KEN RODE 03 Mar '09

03 Mar '09

I've been struggling with a problem with using regex_replace this afternoon, and I would appreciate some pointers on properly using the regex package. I've got a file that is similar to a CSS style sheet (it's actually a Qt style sheet) that contains color entries that similar to: rgb( 200, 255, 200 ). I've already successfully written some code that finds these patterns and replaced them with statically determined text, just to verify that I was able to locate them all properly. I have an application in which the color scheme of the user interface (specified in the style sheet) has to change between a daytime and nighttime color scheme. The nighttime color scheme is derived from the daytime color scheme by reducing the luminance of the colors. I'd like to generate the nighttime color scheme from the daytime scheme by extracting the components of the color and applying a calculation to them, then replacing the original text with the new text. The examples on the Boost site for regex_replace all demonstrate replacement with static text. I suspect that I have to do some sort of combination using regex_replace, regex_iterator, and match_results, but I can't quite wrap my head around the documentation for these classes to see how they interoperate. I would appreciate some pointers as to how to proceed.

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Re: [Boost-users] New and updated serialization performance results
by Brian Wood 03 Mar '09

03 Mar '09

Robert Ramey writes: >Given your interest in this topic, you might want to take a look at > >boost/libs/serialization/performance. > >included with the boost 1.38 package. > >There is a Jamfile.v2 in that directory and everything is set >up just the way boost testing is. The only difference is >that, using the GCC compiler, a function by function >time table is generated which pinpoints where time >is being consumed. This would help answer such questions >as "what if I replaced std::string with something else". > >I only included a couple of performance tests to >demonstrate the system. I havn't had time to make >a more complete set of tests. Ideally, I would like >to see your tests included for comparison. The source code on webEbenezer.net is not copyright protected, so anyone interested in doing what you suggest is welcome to do so. I doubt I'm going to be able to do that anytime soon. > >My question has always been that since serialization >(in at least the simpler cases) just boils down >to writing out the data, whether the code is >generated by one template or another shouldn't >make a big difference. That is, at the end of the >day, the sequence of operations should be pretty >much the same whether one is hand rolling the code >or whether it is generated by templates. > It may have something to do with your use of iostreams. I don't think that accounts for all of the difference, but my guess is it's a big part of it. In my opinion using insert with a hint is an easy way to improve the performance of the Boost Serialization library when loading instances of (multi)set, multi(map) and rb_tree. To my knowledge the only draw back with that is if someone is serializing from say a list<int> to a set<int> and the data in the list is not ordered. In that case using a hint would impede performance. Since that situation does not come up a lot, I think using hinted inserts as a default makes sense. We plan to change (this month) from a default of "regular" insert functions to hinted inserts for the types mentioned here. Currently we have a @hi option to turn on hinted inserts. That will change to @nohi to turn them off and could be used if data from a non-ordered list<int> is being sent to a set<int>. Brian Wood Ebenezer Enterprises www.webEbenezer.net "Then Samuel took a rock and set it up between Mizpah and Shen. He named it Ebenezer [Rock of Help] and said, 'Until now the LORD has helped us.'"

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[Review] RangeEx review extended to the 10th of March
by Thorsten Ottosen 03 Mar '09

03 Mar '09

Dear Developers and Users, The review period is extended one week. If you find this library interesting, please submit a review. The discussion so far may be found here: http://archives.free.net.ph/message/20090220.122836.73bdbd04.en.html Below you will find a description of the library and information on how to write a review. best regards Thorsten, review manager What is it? +++++++++++ The library provide two very useful extensions to the range library 1. Range-based algorithms. E.g. boost::sort( rng ); which is a convenient wrapper of instead of std::sort( boost::begin(rng), boost::end(rng) ); But the new interface also allows for more expressive code because (on the fly) composition of algorithms suddenly is possible. 2. Range adaptors. E.g. std::vector<int> vec = ...; boost::copy( vec | boost::adaptors::reversed, std::ostream_iterator<int>( std::cout ) ); where the expression "vec | boost::adaptors::reversed" wraps the iterators of the range on the left in reverse iterators. The library provides a wide range (no pun intended) of Range adaptors, and they are a powerful way to create ranges on the fly and pass them to algorithms. Getting the library +++++++++++++++++++ The library may be downloaded from http://www.cs.aau.dk/~nesotto/boost/range_ex.zip or from the Boost vault under "Algorithms". The docs may be browsed online here http://www.cs.aau.dk/~nesotto/boost/libs/range/ Please note that the documentation is integrated with the current Range ilbrary. Therefore the relevant sections for the review is http://www.cs.aau.dk/~nesotto/boost/libs/range/doc/adaptors.html and http://www.cs.aau.dk/~nesotto/boost/libs/range/doc/algorithms.html The code may be browsed here: http://www.cs.aau.dk/~nesotto/boost/boost/range/ Notice the library is header only (exception: the adaptor tokenized() depends on Boost.Regex). Writing a review ++++++++++++++++ If you feel this is an interesting library, then please submit your review to the developer list (preferably), or to the review manager. Here are some questions you might want to answer in your review: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick - reading? In-depth study? - Are you knowledgeable about the problem domain? And finally, every review should answer this question: - Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Special considerations ++++++++++++++++++++++ Various RangeEx like libraries have been implemented in the past. You might want to compare with those libraries when you form your oppinion: 1. John Torjo's range lib http://rangelib.synesis.com.au/libs/boost-rangelib-20040913.zip http://torjo.com/rangelib/index.html 2. Adobe's ASL libraries include range-based algorithms: http://stlab.adobe.com/group__algorithm.html I'm looking forward to your review. best regards Thorsten, Review Manager

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[Proto] Splitting AST
by Joel Falcou 03 Mar '09

03 Mar '09

Let's say I want to take an expression involving operators +,-,*,/ and a function split. What I want to do is writing a transform taking such an expression and returning a fusion::vector or list (I guess) of expressions containing all sub-expressions of the original AST only separated on each insatcne of a split call. E.g : Xpr = a+b+split( c*d + split(e-f)); is turned into Xprs = [ a+b+placeholder<1>, c*d+placeholder<2>, e-f]; I guess I should use the State/Data parameters of the transform but i can't get the thing right. Any hints on how to tackle this without losing hairs ? -- ___________________________________________ Joel Falcou - Assistant Professor PARALL Team - LRI - Universite Paris Sud XI Tel : (+33)1 69 15 66 35

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using boost::filesystem::delete
by Sean Farrow 03 Mar '09

03 Mar '09

Hi: I have a boost::filesystem::wpath object. I need to firstly check if the file exists, and secondly delete and check the file has been deleted. How would I go about this? I've loked at the reference and carn't seem to make sense, are thee any examples of both these functions? Any help apreciated. Sean.

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Installing boost 1.38 in UBUNTU 8.10
by jan acosta 03 Mar '09

03 Mar '09

Hey guys, I am having trouble linking my boost libraries to a program I am trying to install. I need to install boost versions above 1.37 and ubuntu doesn't have packages yet for anything above 1.35. I am trying to install this program: http://webapp.dam.brown.edu/wiki/SciComp/InstallHedgeFromGit I followed the steps in his wiki but I always get this error message: g++ -pthread -shared -Wl,-Bsymbolic-functions build/temp.linux-x86_64-2.5/src/cpp/cuda.o build/temp.linux-x86_64-2.5/src/cpp/bitlog.o build/temp.linux-x86_64-2.5/src/wrapper/wrap_cudadrv.o build/temp.linux-x86_64-2.5/src/wrapper/mempool.o -L/home/supacreative/pool/include/lib -L/usr/local/cuda/lib -lboost_python-gcc41-mt -lcuda -o build/lib.linux-x86_64-2.5/pycuda/_driver.so /usr/bin/ld: cannot find -lboost_python-gcc41-mt collect2: ld returned 1 exit status error: command 'g++' failed with exit status 1 I can't get past this error. I've tried using the export command using: export LD_LIBRARY_PATH=/home/(my username)/pool/lib:$LD_LIBRARY_PATH and I still get the same error message. I even added the library folder into my ld.so.conf.d and ran ldconfig to restart ld, but I still get the same error. Please help. Jan

3 2

Template method applied to template object
by Adrien Chauve 03 Mar '09

03 Mar '09

Hi all, The following lines don't compile with g++ (4.3.2) whereas it's ok with msvc 9. struct Foo { template<class T> unsigned int foo() const { return sizeof(T); } }; struct OtherFoo { template<class T> void f(const T& t) { t.foo<double>(); } }; int main() { Foo foo; OtherFoo other; other.f<Foo>(foo); return 0; } The ouput is : test.cpp: In member function ‘void OtherFoo::f(const T&)’: test.cpp:17: erreur: expected primary-expression before ‘double’ test.cpp:17: erreur: expected `;' before ‘double’ Does anybody know a workaround ? Thanks, Adrien

4 4

Error when trying to build boost 1.38.0 with msvc 8.0
by LPE 03 Mar '09

03 Mar '09

I'm trying to build boost 1.38.0 on Windows, with MSVC 8.0 and bjam 3.1.17, and I get this error : D:\boost_1_38_0>bjam -q -j3 -d+2 --toolset=msvc --build-type=complete Skipping build of: ./headers <build>no in common properties Skipping build of: ./headers <build>no in common properties Skipping build of: ./headers <build>no in common properties Skipping build of: ./headers <build>no in common properties warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. Building Boost.Regex with the optional Unicode/ICU support disabled. Note: Please refer to the Boost.Regex documentation for more information Note: this is a strictly optional feature. Skipping build of: ./build_all <build>no in common properties Skipping build of: ./build_all <build>no in common properties Skipping build of: ./build_all <build>no in common properties Skipping build of: ./build_all <build>no in common properties common.mkdir bin.v2 if not exist "bin.v2\\" mkdir "bin.v2" 'C:\Documents' is not recognized as an internal or external command, operable program or batch file. ...skipped bin.v2\libs for lack of bin.v2... Thanks in advance.

3 5

Re: [Boost-users] Installing boost 1.38 in UBUNTU 8.10 (Alain Leblanc)
by jan acosta 03 Mar '09

03 Mar '09

Did you verify that you have a file named boost_python-gcc41-mt.so or boost_python-gcc41-mt.a? Depending on the options you used when you installed boost they may have a different name, such as without the gcc42 or with an extra -1.38. Yes I verified that those are the names. My compiler version is gcc41. I had to downgrade from gcc42 to gcc41 because Cuda has problems running at higher versions of the compiler. To install hedge or pycuda, I only have to put boost_python-gcc41-mt in this file he wants us to make: The following text should be placed in $HOME/.aksetup-defaults.py: BOOST_INC_DIR = ['/users/sfield/pool/include/boost-1_38/'] BOOST_LIB_DIR = ['/users/sfield/pool/lib'] BOOST_BINDINGS_INC_DIR = ['/users/sfield/pool/include/boost-numeric-bindings/'] BOOST_PYTHON_LIBNAME = ['boost_python-gcc41-mt'] BOOST_MPI_LIBNAME = ['boost_mpi-gcc41-mt'] # WITH_SPARSE_WRAPPERS = True Should I try to change the name to boost_python-gcc41-mt.so or boost_python-gcc41.a? I have all of these files in my boost library folder. These are the things I need to get installed: http://webapp.dam.brown.edu/wiki/SciComp/InstallHedgeFromGit http://documen.tician.de/pycuda/ I'm stuck and don't know what else to do....

1 0

Re: [Boost-users] Formal Review: Boost.RangeEx
by Alan M. Carroll 03 Mar '09

03 Mar '09

1 0

RE [Q] any successes in building 1.38+GCC-4.3.2+cygwin
by Vial, Florent 03 Mar '09

03 Mar '09

>>> ./boost/config/requires_threads.hpp:29:4: error: #error "Threading >>> support unavaliable: it has been explicitly disabled with BOOST_DISABLE_THREADS" >> This may be an issue with 4.3.2 as it works fine with 3.4.4. >AFAIR, there is no pthreads in gcc-4 on cygwin. I agree with that. I tried it too for a couple of weeks, but the current gcc 4.3.2 version installed in cygwin was built without pthread. Try a "$gcc-4.exe --v". On my machine it returns: Using built-in specs. Target: i686-pc-cygwin Configured with: /gnu/gcc/release/gcc4-4.3.2-1/src/gcc-4.3.2/configure --srcdir=/gnu/gcc/release/gcc4-4.3.2-1/src/gcc-4.3.2 --prefix=/usr --exec-prefix=/us --bindir=/usr/bin --sbindir=/usr/sbin --libexecdir=/usr/sbin --localstatedir=/var --sysconfdir=/etc --datadir=/usr/share --infodir=/usr/share/info --mandi =/usr/share/man -v --with-gmp=/usr --with-mpfr=/usr --enable-bootstrap --enable-version-specific-runtime-libs --with-slibdir=/usr/bin --libexecdir=/usr/lib --enable-static --enable-shared --enable-shared-libgcc --enable-__cxa_atexit --with-gnu-ld --with-gnu-as --with-dwarf2 --disable-sjlj-exceptions --enable-l nguages=ada,c,c++,fortran,java,objc,obj-c++ --disable-symvers --enable-libjava --program-suffix=-4 Thread model: single gcc version 4.3.2 20080827 (alpha-testing) 1 (GCC) The line saying "Thread model: single" says it all... HTH, Florent Arnold & Richter Cine Technik GmbH & Co. Betriebs KG Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRA 57918 Personlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRB 54477 Geschaftsfuhrer: Prof. Dr. Dejan Ilic; Franz Kraus; Jens Schafer

1 0

problems with 32-bit Boost libs on Linux 64-bit with multilib gcc
by Damien Hocking 03 Mar '09

03 Mar '09

Hi all, I'm having some problems with building a 32-bit Boost on a 64-bit Linux. I'm building 1.38 and I need 64 and 32-bit version of the libraries. The compiler is gcc 4.3.2 with the multilibs installed (Ubuntu 8.10). My builds go through successfully, but when I link my 32-bit version of my application to what should be 32-bit Boost libraries, I get the "skipping incompatible" warning from the linker, which means that the address model is wrong. For example: /usr/bin/ld: skipping incompatible 3rdparty/boost/linux/x86/debug/libboost_serialization-gcc43-mt-d-1_38.so The 64-bit libraries are fine and the application links and runs correctly. I noticed in gcc.jam there's a comment about not being able to build a clean 32-bit binary with a 64-bit compiler. This is my bjam command for a 32-bit Boost build: bjam --build-dir=./build32 address-model=32 --build-type=complete --stagedir=./stage32 stage Do I need a -m32 in a config file or something extra on that command line? Damien

1 1

Timing of BoostPro 1.38 Installer?
by Scott Meyers 03 Mar '09

03 Mar '09

Does anybody happen to know when an installer will be available for Boost 1.38? Thanks, Scott

5 5

[Q] any successes in building 1.38+GCC-4.3.2+cygwin
by V S P 03 Mar '09

03 Mar '09

I was trying to test my code on gcc and since do not have access to linux, I used cygwin gcc v 4.3.2 with boost 1.38. I first built bjam (it went Ok). copied it to /bin then created symlink g++ to gcc-4 (cygwin has gcc 4.3.2 as gcc-4) and then with this command bjam toolset=gcc variant=debug release link=shared threading=multi runtime-link=shared stage started the build thread library built (although I am not sure if pthreads are supported on cygwin, may be it was just a dummy library). Many link errors. So wanted to ask if anybody has tried - or if you guys would recommend to try the same with gcc-3.4 thank you in advance -- V S P toreason(a)fastmail.fm -- http://www.fastmail.fm - One of many happy users: http://www.fastmail.fm/docs/quotes.html

4 5

Taucs installation
by Chaman Singh Verma 03 Mar '09

03 Mar '09

Hello, I downloaded "Taucs" from the CGAL site, but it seems that installation is not clean. Can someone tell what I must do ? Thanks. csv csv610@blackhole:~/Downloads/taucs_full$ export OSTYPE=linux csv610@blackhole:~/Downloads/taucs_full$ ./configure ./configure: 61: [[: not found cc -o configurator/configurator configurator/taucs_config.c rm -rf lib/linux/* rm -rf obj/linux/* rm -rf bin/linux/* rm -rf lib/linux/*.* rm -rf obj/linux/*.* rm -rf bin/linux/*.* rm -rf build/linux/taucs_config_tests.h rmdir obj/linux/ rmdir: failed to remove `obj/linux/': No such file or directory make: [clean] Error 1 (ignored) rmdir bin/linux/ rmdir: failed to remove `bin/linux/': No such file or directory make: [clean] Error 1 (ignored) rmdir lib/linux/ rmdir: failed to remove `lib/linux/': No such file or directory make: [clean] Error 1 (ignored) csv610@blackhole:~/Downloads/taucs_full$

2 2

Visual C++ 9.0 + WinCE
by Hernan Di Pietro 03 Mar '09

03 Mar '09

I'm using Boost 1.37 and I've found that using the headers to develop WinCE applications with WinCE causes Boost header config/compiler/visualc.hpp to emit the EVC++ version not recognized. I've patched the *visualc.hpp* header to recognize the WinCE/VC9 configuration as follows: (line 150): # if defined(UNDER_CE) # if _MSC_VER < 1200 // Note: these are so far off, they are not really supported # elif _MSC_VER < 1300 // eVC++ 4 comes with 1200-1202 # define BOOST_COMPILER_VERSION evc4.0 # elif _MSC_VER == 1400 # define BOOST_COMPILER_VERSION evc8 *# elif _MSC_VER == 1500 # define BOOST_COMPILER_VERSION evc9* # else # if defined(BOOST_ASSERT_CONFIG) # error "Unknown EVC++ compiler version - please run the configure tests and report the results" # else # pragma message("Unknown EVC++ compiler version - please run the configure tests and report the results") # endif # endif Thanks, I dont if there's any workaround already available. Hernán.

2 1

[Function] Small function optimization
by Robert Jones 03 Mar '09

03 Mar '09

A while back I wrote some code which made heavy use of small boost::functions, using Boost 1.33.1. The performance hit was pretty grim, and in the end I had to take thme out and use non generic hand rolled solutions. However, we have recently upgraded to Boost 1.37, and I notive from all the Boost version issue docs that a small function optimization was added in n Boost 1.35. Can anyone tell me in general terms what was done, and possibly if I'm likely to find the performance significantly better now. Many Thanks, Rob.

1 0

can't debug into BOOST_FOREACH?
by Stephan Menzel 03 Mar '09

03 Mar '09

Hi there, I just noticed there seems to be no way of debugging into a BOOST_FOREACH loop... Is that true? I use g++ 4.3 / gdb 6.8 here and neither would the debugger stop any any breakpoint inside such loops nor can I step into them from outside. Is this supposed to be like that? puzzled... Stephan

5 7

New and updated serialization performance results
by Brian Wood 03 Mar '09

03 Mar '09

Recently I updated this comparsion, http://webEbenezer.net/comparison.html, of Ebenezer Enterprises and the Boost Serialization library. Here's a link to the previous version of that file, http://webEbenezer.net/compprev.html. The previous tests used Boost 1.34.1 and the updated versions use Boost 1.38. I didn't detect any improvement performance- wise in the Boost Serialization library in this round of testing. In addition to the updated results, I've added some new tests that test loading/receiving data. Although Boost Serialization comes closer to Ebenezer times when loading/receiving data than it does when saving/sending data, there still is a gap between the two. That gap is greatest when (multi)set, (multi)map, or rb_tree are used. This is probably because Boost Serialization doesn't use the insert with a hint function available with these containers. I believe that multi_index uses the hinted verison of insert in it's marshalling code, so in my opinion it makes sense to consider this in Boost Serialization also. Additionally, we've added support for flex_string, http://erdani.org/code/main.html, to the site. On that page it says Harmut Kaizer reported that dropping flex_string into the Wave Boost Preprocessor improved it's speed by 5-10%, depending on input. I've done a few performance tests comparing the two strings and also found flex_string to be more efficient than std::string. Brian Wood Ebenezer Enterprises www.webEbenezer.net "Then Samuel took a rock and set it up between Mizpah and Shen. He named it Ebenezer [Rock of Help] and said, 'Until now the LORD has helped us.'"

2 1

[result_of] member function
by er 03 Mar '09

03 Mar '09

Hi All, Is this feasible? How? class Foo { template<typename Signature> struct result{}; template<typename F> struct result<(F::*f)(value_type)>{ typedef value0_type if f == foo, value1_type if f == bar type; }; value0_type foo(value_type); value1_type bar(value_type); }; How do I invoke result_of to get the result type of F::foo(value_type)?

2 4

Re: [Boost-users] [asio] still weird crashes with asio using libpion on windows
by FantasyDR 03 Mar '09

03 Mar '09

I met the same issue. And finally I found it was caused by the sequence of object destruction. The asio needs an io_service object to handle all async call. The io_service implementation such as win_iocp_io_service hold a list of its service instance. These instances may be held by object such as tcp::acceptor from their constructor. If io_service was destroyed before the tcp::acceptor then the instance pointer will be released and cause a crash in tcp::acceptor's destructor. The solution is very simple: make sure the io_service was destroyed after all other object that may hold a reference to it. I hope I've described it clearly and can give you some help :-) Bugzilla from stephan.menzel(a)gmx.eu wrote: > > Hi all, > > I have been experiencing problems with weird crashes on Windows using > libpion (http://www.pion.org/projects/pion-network-library) and the > problem is still there with pion 1.0.10 but it changed a little and might > shed some new light on the > Let me just outline the situation. I have a simple project with an app and > two libs, both using boost 1.36 at this time. The app links against those > two libs, and one of the libs links against pion. So does the app of > course. I've built pion as debug dll with boost 1.36. This runs on Windows > and Linux. > Now on Linux everything is fine, no problem at all, no dangerous valgrind > output, nothing. > On Windows however, the application crashes as soon as I do something with > pion, and the callstack leads me to believe it's got something to do with > boost asio. > > Usually it happens within asio win_mutex and looks a lot like this: > http://trac.atomiclabs.com/ticket/32 > To me this looks like an uninitialized mutex is being used. > Not entirely however. I get this: > > First-chance exception at 0x7c91100b in myapp.exe: 0xC0000005: Access > violation reading location 0x00000028. > > it's in win_mutex.hpp > > int do_lock() > { > #if defined(__MINGW32__) > // Not sure if MinGW supports structured exception handling, so for > now > // we'll just call the Windows API and hope. > ::EnterCriticalSection(&crit_section_); > return 0; > #else > __try > { > -> ::EnterCriticalSection(&crit_section_); // CRASH > } > __except(GetExceptionCode() == STATUS_INVALID_HANDLE > || GetExceptionCode() == STATUS_NO_MEMORY > ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) > { > if (GetExceptionCode() == STATUS_NO_MEMORY) > return ERROR_OUTOFMEMORY; > return ERROR_INVALID_HANDLE; > } > > return 0; > #endif > } > > This exception repeats many times until eventually the app crashes because > 'this' is invalid, pointing somewhere it shouldn't. > The Bug occurs several seconds after the application has started, but I > don't have to actually access pion's http socket for that. I think it > might not be pion's fault at all. > > The whole thing only happens on Windows and renders both pion useless on > that system. I know, it's only Windows but I've been debugging around that > for some months now and I'd really like that solved at some point. > > Any ideas? > > Thanks a lot... > > Stephan > > > PS: > I can't go to boost 1.37 because of: > https://svn.boost.org/trac/boost/ticket/2541 > With Chris apparently not responding or posting about ASIO any more is > there any chance of this being fixed in the next release? Is ASIO > maintained at all? Cause nobody seems to care about that bug. Again, I > know it's only Windows but as long as Windows is officially a supported > system an imporant lib like ASIO should work on it. > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > -- View this message in context: http://www.nabble.com/-asio--still-weird-crashes-with-asio-using-libpion-on… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

Formal Review: Boost.RangeEx
by Thorsten Ottosen 02 Mar '09

02 Mar '09

Dear Developers and Users, It's my pleasure to announce that the review of Neil Groves' RangeEx library starts today and lasts until March 3, 2009. What is it? +++++++++++ The library provide two very useful extensions to the range library 1. Range-based algorithms. E.g. boost::sort( rng ); which is a convenient wrapper of instead of std::sort( boost::begin(rng), boost::end(rng) ); But the new interface also allows for more expressive code because (on the fly) composition of algorithms suddenly is possible. 2. Range adaptors. E.g. std::vector<int> vec = ...; boost::copy( vec | boost::adaptors::reversed, std::ostream_iterator<int>( std::cout ) ); where the expression "vec | boost::adaptors::reversed" wraps the iterators of the range on the left in reverse iterators. The library provides a wide range (no pun intended) of Range adaptors, and they are a powerful way to create ranges on the fly and pass them to algorithms. Getting the library +++++++++++++++++++ The library may be downloaded from http://www.cs.aau.dk/~nesotto/boost/range_ex.zip or from the Boost vault under "Algorithms". The docs may be browsed online here http://www.cs.aau.dk/~nesotto/boost/libs/range/ Please note that the documentation is integrated with the current Range ilbrary. Therefore the relevant sections for the review is http://www.cs.aau.dk/~nesotto/boost/libs/range/doc/adaptors.html and http://www.cs.aau.dk/~nesotto/boost/libs/range/doc/algorithms.html The code may be browsed here: http://www.cs.aau.dk/~nesotto/boost/boost/range/ Notice the library is header only (exception: the adaptor tokenized() depends on Boost.Regex). Writing a review ++++++++++++++++ If you feel this is an interesting library, then please submit your review to the developer list (preferably), or to the review manager. Here are some questions you might want to answer in your review: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick - reading? In-depth study? - Are you knowledgeable about the problem domain? And finally, every review should answer this question: - Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Special considerations ++++++++++++++++++++++ Various RangeEx like libraries have been implemented in the past. You might want to compare with those libraries when you form your oppinion: 1. John Torjo's range lib http://rangelib.synesis.com.au/libs/boost-rangelib-20040913.zip http://torjo.com/rangelib/index.html 2. Adobe's ASL libraries include range-based algorithms: http://stlab.adobe.com/group__algorithm.html I'm looking forward to your review. best regards Thorsten, Review Manager

2 1

[Review] Reminder: Boost.RangeEx review is going on
by Thorsten Ottosen 02 Mar '09

02 Mar '09

Dear Developers and Users, The review of Neil Groves' RangeEx library lasts until March 3, 2009. Please find the time to do a review if you are interested in this library. The discussion so far may be found here: http://archives.free.net.ph/message/20090220.122836.73bdbd04.en.html Below you will find a description of the library and information on how to write a review. best regards Thorsten, review manager What is it? +++++++++++ The library provide two very useful extensions to the range library 1. Range-based algorithms. E.g. boost::sort( rng ); which is a convenient wrapper of instead of std::sort( boost::begin(rng), boost::end(rng) ); But the new interface also allows for more expressive code because (on the fly) composition of algorithms suddenly is possible. 2. Range adaptors. E.g. std::vector<int> vec = ...; boost::copy( vec | boost::adaptors::reversed, std::ostream_iterator<int>( std::cout ) ); where the expression "vec | boost::adaptors::reversed" wraps the iterators of the range on the left in reverse iterators. The library provides a wide range (no pun intended) of Range adaptors, and they are a powerful way to create ranges on the fly and pass them to algorithms. Getting the library +++++++++++++++++++ The library may be downloaded from http://www.cs.aau.dk/~nesotto/boost/range_ex.zip or from the Boost vault under "Algorithms". The docs may be browsed online here http://www.cs.aau.dk/~nesotto/boost/libs/range/ Please note that the documentation is integrated with the current Range ilbrary. Therefore the relevant sections for the review is http://www.cs.aau.dk/~nesotto/boost/libs/range/doc/adaptors.html and http://www.cs.aau.dk/~nesotto/boost/libs/range/doc/algorithms.html The code may be browsed here: http://www.cs.aau.dk/~nesotto/boost/boost/range/ Notice the library is header only (exception: the adaptor tokenized() depends on Boost.Regex). Writing a review ++++++++++++++++ If you feel this is an interesting library, then please submit your review to the developer list (preferably), or to the review manager. Here are some questions you might want to answer in your review: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick - reading? In-depth study? - Are you knowledgeable about the problem domain? And finally, every review should answer this question: - Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Special considerations ++++++++++++++++++++++ Various RangeEx like libraries have been implemented in the past. You might want to compare with those libraries when you form your oppinion: 1. John Torjo's range lib http://rangelib.synesis.com.au/libs/boost-rangelib-20040913.zip http://torjo.com/rangelib/index.html 2. Adobe's ASL libraries include range-based algorithms: http://stlab.adobe.com/group__algorithm.html I'm looking forward to your review. best regards Thorsten, Review Manager

8 9

IEC/SI Binary Prefix Formatter
by Rodrigo Madera 02 Mar '09

02 Mar '09

Hello guys, I'm wondering if in the Boost universe we already have something to format numbers according to IEC's "new" prefixes (such as MiB and GiB) or SI prefixes (such as MB and GB). What I'm looking for is something like: formatter << boost::iec_prefix << 5*1024*1024; // Will output "5 GiB" formatter << boost::si_prefix << 5*1024*1024; // Will output "5GB" Do you have anything like this? Thank you for your support, Rodrigo Madera

2 2

[asio] SSL enabled http server3 example is blocking
by Jean-Pierre Bergamin 02 Mar '09

02 Mar '09

Dear boost-users I changed the http server3 example (many thready run io_service::run()) to use SSL connections. I now face the problem that the async_accept handler is only called when no other connections are alive and not immediately by another thread as with the original non-ssl example. My modified request_handler simply sleeps for 10 seconds. Now when a request arrives while another one is being processed (sleeping), it is only handled after the other one finished. By setting a breakpoint in server::handle_accept() I can see that this handler for the second request is only called after the first connection has been destroyed/closed. This happens on Windows XP. Do you may have an idea why the accept handler is not called immediately or where the blocking could happen? I may help if you could test this on another platform then XP. To test this, apply the attached patch to the directory boost_1_38_0/libs/asio/example/http/server3 and copy the *.pem files from the asio ssl example to the working directory of the server3 example. Regards James PS: I already posted this question to the asio-users list without gettinga reply. I'm trying my luck now here on the boost list. diff -ru server3.orig/connection.cpp server3/connection.cpp --- server3.orig/connection.cpp 2008-03-12 10:12:08.000000000 +0100 +++ server3/connection.cpp 2009-02-17 15:52:12.867198900 +0100 @@ -17,20 +17,20 @@ namespace server3 { connection::connection(boost::asio::io_service& io_service, + boost::asio::ssl::context &context, request_handler& handler) : strand_(io_service), - socket_(io_service), + socket_(io_service, context), request_handler_(handler) { } -boost::asio::ip::tcp::socket& connection::socket() +connection::socket_type::lowest_layer_type& connection::socket() { - return socket_; + return socket_.lowest_layer(); } -void connection::start() -{ +void connection::handle_handshake(const boost::system::error_code& e) { socket_.async_read_some(boost::asio::buffer(buffer_), strand_.wrap( boost::bind(&connection::handle_read, shared_from_this(), @@ -38,6 +38,14 @@ boost::asio::placeholders::bytes_transferred))); } +void connection::start() +{ + socket_.async_handshake(boost::asio::ssl::stream_base::server, + boost::bind(&connection::handle_handshake, shared_from_this(), + boost::asio::placeholders::error) + ); +} + void connection::handle_read(const boost::system::error_code& e, std::size_t bytes_transferred) { @@ -85,7 +93,7 @@ { // Initiate graceful connection closure. boost::system::error_code ignored_ec; - socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignored_ec); + socket_.shutdown(ignored_ec); } // No new asynchronous operations are started. This means that all shared_ptr diff -ru server3.orig/connection.hpp server3/connection.hpp --- server3.orig/connection.hpp 2008-03-12 10:12:08.000000000 +0100 +++ server3/connection.hpp 2009-02-26 08:51:42.187500000 +0100 @@ -12,6 +12,7 @@ #define HTTP_SERVER3_CONNECTION_HPP #include <boost/asio.hpp> +#include <boost/asio/ssl.hpp> #include <boost/array.hpp> #include <boost/noncopyable.hpp> #include <boost/shared_ptr.hpp> @@ -30,17 +31,20 @@ private boost::noncopyable { public: + typedef boost::asio::ssl::stream<boost::asio::ip::tcp::socket> socket_type; /// Construct a connection with the given io_service. explicit connection(boost::asio::io_service& io_service, + boost::asio::ssl::context &context, request_handler& handler); /// Get the socket associated with the connection. - boost::asio::ip::tcp::socket& socket(); + socket_type::lowest_layer_type& socket(); /// Start the first asynchronous operation for the connection. void start(); - + ~connection() {} private: + void handle_handshake(const boost::system::error_code& e); /// Handle completion of a read operation. void handle_read(const boost::system::error_code& e, std::size_t bytes_transferred); @@ -52,7 +56,7 @@ boost::asio::io_service::strand strand_; /// Socket for the connection. - boost::asio::ip::tcp::socket socket_; + socket_type socket_; /// The handler used to process the incoming request. request_handler& request_handler_; diff -ru server3.orig/reply.cpp server3/reply.cpp --- server3.orig/reply.cpp 2008-03-12 10:12:08.000000000 +0100 +++ server3/reply.cpp 2009-02-17 15:52:20.804800500 +0100 @@ -119,7 +119,7 @@ namespace stock_replies { -const char ok[] = ""; +const char ok[] = "ok\r\n"; const char created[] = "<html>" "<head><title>Created</title></head>" diff -ru server3.orig/request_handler.cpp server3/request_handler.cpp --- server3.orig/request_handler.cpp 2008-03-12 10:12:08.000000000 +0100 +++ server3/request_handler.cpp 2009-02-26 08:23:56.250000000 +0100 @@ -8,6 +8,7 @@ // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // +#include <boost/thread.hpp> #include "request_handler.hpp" #include <fstream> #include <sstream> @@ -27,56 +28,9 @@ void request_handler::handle_request(const request& req, reply& rep) { - // Decode url to path. - std::string request_path; - if (!url_decode(req.uri, request_path)) - { - rep = reply::stock_reply(reply::bad_request); - return; - } - - // Request path must be absolute and not contain "..". - if (request_path.empty() || request_path[0] != '/' - || request_path.find("..") != std::string::npos) - { - rep = reply::stock_reply(reply::bad_request); - return; - } - - // If path ends in slash (i.e. is a directory) then add "index.html". - if (request_path[request_path.size() - 1] == '/') - { - request_path += "index.html"; - } - - // Determine the file extension. - std::size_t last_slash_pos = request_path.find_last_of("/"); - std::size_t last_dot_pos = request_path.find_last_of("."); - std::string extension; - if (last_dot_pos != std::string::npos && last_dot_pos > last_slash_pos) - { - extension = request_path.substr(last_dot_pos + 1); - } - - // Open the file to send back. - std::string full_path = doc_root_ + request_path; - std::ifstream is(full_path.c_str(), std::ios::in | std::ios::binary); - if (!is) - { - rep = reply::stock_reply(reply::not_found); - return; - } - - // Fill out the reply to be sent to the client. - rep.status = reply::ok; - char buf[512]; - while (is.read(buf, sizeof(buf)).gcount() > 0) - rep.content.append(buf, is.gcount()); - rep.headers.resize(2); - rep.headers[0].name = "Content-Length"; - rep.headers[0].value = boost::lexical_cast<std::string>(rep.content.size()); - rep.headers[1].name = "Content-Type"; - rep.headers[1].value = mime_types::extension_to_type(extension); + using namespace boost; + this_thread::sleep(posix_time::seconds(10)); + rep = reply::stock_reply(reply::ok); } bool request_handler::url_decode(const std::string& in, std::string& out) diff -ru server3.orig/server.cpp server3/server.cpp --- server3.orig/server.cpp 2008-03-12 10:12:08.000000000 +0100 +++ server3/server.cpp 2009-02-17 16:24:16.173066900 +0100 @@ -21,9 +21,23 @@ const std::string& doc_root, std::size_t thread_pool_size) : thread_pool_size_(thread_pool_size), acceptor_(io_service_), - new_connection_(new connection(io_service_, request_handler_)), + context_(io_service_, boost::asio::ssl::context::sslv23), + new_connection_(new connection(io_service_, context_, request_handler_)), request_handler_(doc_root) { + + context_.set_options( + boost::asio::ssl::context::default_workarounds + | boost::asio::ssl::context::no_sslv2 + | boost::asio::ssl::context::single_dh_use); + context_.set_password_callback(boost::bind<const char*>(&server::get_password, this)); + + context_.use_certificate_chain_file("server.pem"); + context_.use_private_key_file("server.pem", boost::asio::ssl::context::pem); + context_.use_tmp_dh_file("dh512.pem"); + context_.set_verify_mode(boost::asio::ssl::context::verify_none); + + // Open the acceptor with the option to reuse the address (i.e. SO_REUSEADDR). boost::asio::ip::tcp::resolver resolver(io_service_); boost::asio::ip::tcp::resolver::query query(address, port); @@ -63,7 +77,7 @@ if (!e) { new_connection_->start(); - new_connection_.reset(new connection(io_service_, request_handler_)); + new_connection_.reset(new connection(io_service_, context_, request_handler_)); acceptor_.async_accept(new_connection_->socket(), boost::bind(&server::handle_accept, this, boost::asio::placeholders::error)); diff -ru server3.orig/server.hpp server3/server.hpp --- server3.orig/server.hpp 2008-03-12 10:12:08.000000000 +0100 +++ server3/server.hpp 2009-02-17 16:02:27.187562100 +0100 @@ -39,6 +39,10 @@ void stop(); private: + const char * get_password() const { + return "test"; + } + /// Handle completion of an asynchronous accept operation. void handle_accept(const boost::system::error_code& e); @@ -51,6 +55,8 @@ /// Acceptor used to listen for incoming connections. boost::asio::ip::tcp::acceptor acceptor_; + boost::asio::ssl::context context_; + /// The next connection to be accepted. connection_ptr new_connection_;

1 0

[serialization] Archive reload
by Ferllings 02 Mar '09

02 Mar '09

Hello, I have a Class A with string attributes that I serialize in XML format: Class A { public: string _nom; string _prenom; template<class Archive> void serialize(Archive& ar, const unsigned in version){ ar & boost::serialization::make_nvp("Nom", _nom); ar & boost::serialization::make_nvp("Prenom", _prenom); } } The object is correctly saved using this code: A _a; void save() const { ... oTextArchive::xml_oarchive oTextArchive(ofile); oTextArchive << make_nvp("A", _a); ... } But I want to reload the object, the A attributes aren't updated and keep the previous values: void load() { ... iTextArchive::xml_oarchive iTextArchive(ifile); iTextArchive >> make_nvp("A", _a); ... } The only way I found to reload my object is to use an temporary object: void load() { ... A _tmp; iTextArchive::xml_oarchive iTextArchive(ifile); iTextArchive >> make_nvp("A", _tmp); _a = _tmp; ... } Why can't I update the object directly? Thanks for your help.

2 2

[accumulators] Any was to reset an accumulator_set object?
by dhruva 02 Mar '09

02 Mar '09

Hello, I am using boost::accumulator_set to compute mean. After every 100 samples, I need to start afresh. Since I am using accumulator_set as a member variable in a class (I get samples one at a time and need to preserve accumulator_set object across function calls), I need some mechanism to reset it to its initial state. I am not doing anything fancy like using droppable functionality. As a real crude work around, I am keeping 2 objects. The first is not used for any computing and hence its state is same throughout. The computing is done using the second object. After 100 samples, I just copy the first onto the second hoping the state of second object will be same as first which is the initial state. Is there a better way to achieve the above requirement? -dhruva Download prohibited? No problem. CHAT from any browser, without download. Go to http://in.webmessenger.yahoo.com/

3 2

[lexical_cast] Locales.
by Emre Turkay 02 Mar '09

02 Mar '09

Hi folks, I wonder if there is a downside of adding an optional std::locale argument to lexical_cast? Thanks, Emre Turkay

2 1

[Interprocess] Trying to include unistd.h on Windows?
by Derek Kivi 02 Mar '09

02 Mar '09

We are using the Interprocess library to make use of shared memory within our code. We are experiencing the following problem when building on Windows. Some of our projects are trying to include unistd.h from workaround.hpp. It looks like this happens if BOOST_WINDOWS is not defined. Tracing back through the header files I pieced together that BOOST_WINDOWS is not defined if BOOST_DISABLE_WIN32 is defined (win32.hpp). And BOOST_DISABLE_WIN32 gets defined if _MSC_EXTENSIONS is not defined (visualc.hpp). >From the MSDN documentation, _MSC_EXTENSIONS is not defined if the Visual C++ Language Extensions are turned off, which in fact they are for these projects. Has anyone else seen this and is there a workaround for getting Boost Interprocess to work on Windows in cases where the Visual C++ Language Extensions are turned off? Thanks, Derek -- Derek Kivi Senior Software Developer QuIC Financial Technologies Inc. Office: +1 403 210 8282 Mobile: +1 403 863 5204 derek.kivi(a)quic.com Risk. Managed. www.quic.com Confidentiality Notice: The information transmitted is intended only for the person(s) or entity(ies) to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination, or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this email in error, please contact the sender and delete the email and any related material from any computer. ver. QuIC 0707

2 4

Error while compiling boost thread
by ayansinhas＠gmail.com 02 Mar '09

02 Mar '09

Hi All, I am using boost thread for my project. I have used BCP tool to extract only those binaries that is related to boost thread(and the dependencies also).... Now I am trying to compile my code using only that thread binaries.. previously i tried using that binaries by writing a small code.... and it worked properly. I have done the necessary setings changes in VS2008. A snippet of the errors are as follows c:\program files\bthread\boost\shared_ptr.hpp(142) : error C2332: 'class' : missing tag name 1>c:\program files\bthread\boost\shared_ptr.hpp(142) : error C2011: '<unnamed-tag>' : 'enum' type redefinition 1> c:\program files\microsoft sdks\windows\v6.0a\include\shlwapi.h(1550) : see declaration of '<unnamed-tag>' 1>c:\program files\bthread\boost\shared_ptr.hpp(142) : error C2143: syntax error : missing ',' before 'return' 1>c:\program files\bthread\boost\shared_ptr.hpp(146) : error C2332: 'class' : missing tag name 1>c:\program files\bthread\boost\shared_ptr.hpp(146) : error C2011: '<unnamed-tag>' : 'enum' type redefinition 1> c:\program files\microsoft sdks\windows\v6.0a\include\shlwapi.h(1550) : see declaration of '<unnamed-tag>' 1>c:\program files\bthread\boost\shared_ptr.hpp(146) : error C2143: syntax error : missing ',' before 'return' 1>c:\program files\bthread\boost\shared_ptr.hpp(146) : error C2059: syntax error : 'return' 1>c:\program files\bthread\boost\shared_ptr.hpp(147) : error C2143: syntax error : missing ';' before '{' 1>c:\program files\bthread\boost\shared_ptr.hpp(149) : error C2143: syntax error : missing ';' before '}' 1>c:\program files\bthread\boost\shared_ptr.hpp(153) : error C2143: syntax error : missing ';' before '}' 1>c:\program files\bthread\boost\shared_ptr.hpp(164) : error C2649: 'typename' : is not a 'class' 1>c:\program files\bthread\boost\shared_ptr.hpp(529) : error C2649: 'typename' : is not a 'class' I have done a little bit of googling... but i am not getting the right info.... As we can see it is giving syntax error related to .hpp files .... which I haven't change at all.... I will really appreciate if any body can throw some light on it.... Thanks in Advance Ayan.

2 1

serial programs
by Steven Woody 02 Mar '09

02 Mar '09

Hi, I want to write a portable program which need to read/write serial ports. How can boost help this? Thank you. ( I got know basic serial programming in Linux but I have no idea how that it done in Windows ) -- woody then sun rose thinly from the sea and the old man could see the other boats, low on the water and well in toward the shore, spread out across the current.

7 9

Pool ordered_malloc and O(n)
by Georg Sauthoff 02 Mar '09

02 Mar '09

Hi, the boost pool documentation states ordererd_malloc(n) and boost::free(chunk, n) both take O(n). I tested it with a workload of a lot of n=1 and n=2 small allocations. Basically if I just use boost::malloc(2*base_size) even if i just need boost::malloc(base_size) the runtime is 1 min. With ordered_malloc(_)/boost::free(_,_) the runtime explodes (>> 30 minutes) (I terminated the program). Profiling it, one can see, that ordered_malloc dominates the runtime (83 % after a few minutes). Is this a known issue? Is the runtime of ordered_malloc in O(n), i.e. in O(c\cdot n), but the constant factor c is very huge? Best regards Georg Sauthoff

2 2

serial port and boost::iostream
by Christoph Gysin 02 Mar '09

02 Mar '09

I wrote a simple serial device for the boost::iostream library using the serial interface from boost:asio. Feel free to include it as an example if you find it useful. Chris #include <boost/iostreams/stream.hpp> #include <boost/asio/serial_port.hpp> class serial_device { public: typedef char char_type; typedef boost::iostreams::bidirectional_device_tag category; serial_device(boost::asio::serial_port& port) : serial_port(port) {}; std::streamsize read(char* buf, std::streamsize n) { return serial_port.read_some(boost::asio::buffer(buf, n)); } std::streamsize write(const char* buf, std::streamsize n) { return serial_port.write_some(boost::asio::buffer(buf, n)); } private: boost::asio::serial_port& serial_port; }; void example() { // set up serial port boost::asio::io_service io_service; #ifdef WIN32 boost::asio::serial_port serial_port(io_service, "COM1"); #else boost::asio::serial_port serial_port(io_service, "/dev/ttyS0"); #endif typedef boost::asio::serial_port_base spb; serial_port.set_option(spb::baud_rate(9600)); // create iostream serial_device dev(serial_port); boost::iostreams::stream<serial_device> serial(dev); // use serial port with iostream interface serial << "boost::iostreams are fun!" << std::endl; std::string response; serial >> response; } -- echo mailto: NOSPAM !#$.'<*>'|sed 's. ..'|tr "<*> !#:2" org@fr33z3

1 0

[Serialization] Compile error in load_wrapper
by Ryan Fowler 02 Mar '09

02 Mar '09

Hi, I am having trouble serializing a class. Actually, I am having trouble compiling the class as below. The actual archiving is behind an interface (hence the Save and Load methods) which may work (once I get this sorted, I'm going to look at the export traits), but the error points to me not declaring the is_wrapper properly. My class: BOOST_CLASS_IS_WRAPPER(Frame); class Frame { ... // Serialize interface uint32 Save( uint8* pStream ) { ostrstream os( (char*)pStream, STREAM_SIZE ); boost::archive::text_oarchive oa(os); oa << this; return os.pcount(); } void Load( uint8* pStream ) { istrstream is( (char*)pStream, STREAM_SIZE ); boost::archive::text_iarchive ia(is); ia >> this; } friend class boost::serialization::access; template< class Archive > void serialize( Archive& ar, const unsigned int version ) { string strObjectType = "IFrame"; ar << strObjectType.length() << strObjectType; ar << m_lMaxFrameLength << m_lDataLength << m_uiTimeStamp; ar << boost::serialization::make_binary_object( (void*)(this + 1), m_lMaxFrameLength ); } My error: W:\NewFramework\Boost\boost/archive/detail/iserializer.hpp(541) : error C2664: 'boost::archive::load_wrapper' : cannot convert parameter 3 from 'boost::serialization::is_wrapper<T>' to 'boost::mpl::true_' 1> with 1> [ 1> T= Frame * 1> ] 1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called 1> W:\NewFramework\Boost\boost/archive/detail/common_iarchive.hpp(59) : see reference to function template instantiation 'void boost::archive::load<Archive,const T>(Archive &,const T &)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] 1> W:\NewFramework\Boost\boost/archive/basic_text_iarchive.hpp(62) : see reference to function template instantiation 'void boost::archive::detail::common_iarchive<Archive>::load_override<T>(T &,int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] 1> W:\NewFramework\Boost\boost/archive/text_iarchive.hpp(65) : see reference to function template instantiation 'void boost::archive::basic_text_iarchive<Archive>::load_override<T>(T &,int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] 1> W:\NewFramework\Boost\boost/archive/detail/interface_iarchive.hpp(61) : see reference to function template instantiation 'void boost::archive::text_iarchive_impl<Archive>::load_override<T>(T &,int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] 1> w:\newframework\framework\sourcecode\includes\RDCFrameFactoryImpl\RDCFra me.h(262) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_iarchive<Archive>::operator >>< Frame*const >(T &)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] Thanks, Ryan Ryan Fowler Software Engineer Thomson Reuters Phone: +442075427063 ryan.fowler(a)thomsonreuters.com thomsonreuters.com This email was sent to you by Thomson Reuters, the global news and information company. Any views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of Thomson Reuters.

1 0

How to use boost::regex source code without using any *.lib file
by Jun Wan 02 Mar '09

02 Mar '09

---------- Forwarded message ---------- From: Jun Wan <junjun.wanjun(a)gmail.com> Date: 2009/2/17 Subject: How to use boost::regex source code without using any *.lib file To: boost-users(a)lists.boost.org Hello, Recently I used boost::regex in my project(VS2005 IDE). It works well with linking the lib file. But I want to use the source code of boost::regex.I include the regex.hpp in the project and used BOOST_REGEX_NO_LIB macro; But I got such error infomation when linking the code. error LNK2001: unresolved external symbol "private: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __thiscall boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::do_assign(char const *,char const *,unsigned int)" (?do_assign@?$basic_regex@DU?$regex_traits@DV ?$w32_regex_traits@D@boost@@@boost@@@boost@@AAEAAV12@PBD0I@Z) error LNK2001: unresolved external symbol "private: void __thiscall boost::re_detail::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::construct_init(class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > const &,enum boost::regex_constants::_match_flags)" (?construct_init@?$perl_matcher@PBDV ?$allocator@U?$sub_match@PBD@boost@@@std@@U?$regex_traits@DV ?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost @@AAEXABV?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@ @@boost@@@3@W4_match_flags@regex_constants@3@@Z) error LNK2001: unresolved external symbol "public: bool __thiscall boost::re_detail::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::find(void)" (?find@?$perl_matcher@PBDV ?$allocator@U?$sub_match@PBD@boost@@@std@@U?$regex_traits@DV ?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost@@QAE_NXZ) I want to know why I can't use the source code of boost::regex. Is there any thing I need to do? Any help will be appreciated! Thank you! Jun

3 4

Fastest way of serializing a huge vector of ints into a human readable string
by Roland Bock 02 Mar '09

02 Mar '09

Hi, I have a program which produces a vector of integers (several million entries). I need to write that into a human-readable string of space separated numbers. I wonder, what would be the fastest way? My first attempt was stringstream resultStream; copy(integers.begin(), integers.end(), ostream_iterator<int>(resultStream, " ")); string result = resultStream.str(); But that requires copying the string. Thus I was wondering if I could use boost to write to the target string directly? boost::iostreams allow me to do the following: string result; boost::iostreams::filtering_ostream out(boost::iostreams::back_inserter(result)); copy(integers.begin(), integers.end(), ostream_iterator<uint64>(out, " ")); This is faster by almost a factor of 2. Any ideas how to increase speed even more? Thanks in advance, Roland

3 11

[pool] Request at least 65535 bytes from UserAllocator.
by Alexander 01 Mar '09

01 Mar '09

Hi I'm going to use Boost.Pool with UserAllocator mapped directly to Windows API calls ::VirtualAlloc and ::VirtualFree. So it makes no sense to allocate less than SYSTEM_INFO::dwAllocationGranularity, which currently equals to 65536. To my surprise, I have not found anything like this in documentation. But I've seen in source code this: // pre: npartition_size != 0 && nnext_size != 0 explicit pool(const size_type nrequested_size, const size_type nnext_size = 32) So is "nnext_size" what I was looking for ? And what does mean "an extension", is there an official proposal of Pool for future standard ?

1 0

Building boost 1.38 on mac os X
by Alain Leblanc 01 Mar '09

01 Mar '09

Hi, I'm having problems (again) building boost on mac OS X 64-bit. Once again specifying architecture=x86 address-model=64 to bjam gives me a message that my cpu does not support the x86-64 instruction set. I was getting the same message with boost 1.34, and it was fine for boost 1.36. I tried getting around the problem by adding cxxflags=-m64 to the bjam execution, but then I get the message at the bottom. Invoking bjam with no option will build everything fine, but it looks like it is a 32-bit build. Did anyone have a same issue and manage to solve it? thanks, a "g++" -o "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/libboost_math_c99l-gcc40-mt-1_38.dylib" -Wl,-h -Wl,libboost_math_c99l-gcc40-mt-1_38.dylib -shared -Wl,--start-group "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/acoshl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/asinhl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/atanhl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/cbrtl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/copysignl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/erfcl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/erfl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/expm1l.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/fmaxl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/fminl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/fpclassifyl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/hypotl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/lgammal.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/llroundl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/log1pl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/lroundl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/nextafterl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/nexttowardl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/roundl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/tgammal.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/truncl.o" -Wl,-Bstatic -Wl,-Bdynamic -Wl,--end-group -Wl,--strip-all ...failed gcc.link.dll bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/libboost_math_c99l-gcc40-mt-1_38.dylib... gcc.link.dll bin.v2/libs/program_options/build/gcc-4.0.1/release/threading-multi/libboost_program_options-gcc40-mt-1_38.dylib ld: unknown option: -h collect2: ld returned 1 exit status

3 3

[boost-users]building with _SECURE_SCL=0
by Igor R 01 Mar '09

01 Mar '09

Hello, When I build 1.38.0 with bjam in release configuration, is it built with * _SECURE_SCL*=*0*? If not, how exactly can I enforce it? ** Thanks.

2 1

[Graph] Using a bit-based ajacency matrix.
by Thorsten Ottosen 01 Mar '09

01 Mar '09

Dear All, Does anybody have experience with the above. That is, to represent the graph as a bit-based ajacency matrix, and then use that together with Boost.Graph? I'm thinking that Boost.Graph will not exploit this representation optimally. Am I correct? Thanks in advance -Thorsten

3 8