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

How to sort a vector of tuples
by Sumanth J.V 26 Nov '05

26 Nov '05

Greetings, I have no idea why the following code does not work. Seems to work fine when I try sorting a vector of ints instead. I have even overloaded the < operator. If I understand correctly, this is the only requirement to sort a userdefined class. The compiler gets mad and spits out a a whole bunch of errors. thanx #include "boost/tuple/tuple_io.hpp" #include <vector> #include <algorithm> typedef boost::tuple<unsigned long int, unsigned long int, double, unsigned long int> Task; typedef std::vector<Task> TaskSet; bool operator<(const Task& a, const Task& b) { return boost::get<1>(a) < boost::get<1>(b); } int main(int argc, char** argv) { TaskSet ts; ts.push_back( boost::make_tuple(0, 0, 0, 0) ); ts.push_back( boost::make_tuple(3, 3, 3, 3) ); ts.push_back( boost::make_tuple(2, 2, 2, 2) ); std::sort(ts.begin(), ts.end()); return 0; }

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Re: [Boost-users] shared_ptr vs ordinary pointers
by Merrill Cornish 26 Nov '05

26 Nov '05

Jonathan, Yes, I should have left out the delete() for the shared_ptr version since that's one if its big features. I have used shared_ptr code similar to your example, but I can't use it in the case I'm thinking of. This particular pointer needs to be passed around so a single scope doesn't work. Thanks, Merrill

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shared_ptr vs ordinary pointers
by Merrill Cornish 26 Nov '05

26 Nov '05

With an ordinary C++ pointer, if I have a BaseClass and a DerivedClass derived from BaseClass, then I can do BaseClass* objectPtr; objectPtr = new DerivedClass(); Later, if BaseClass has a virtual destructor, I can call delete(objectPtr) and the DerivedClass destructor will be called. Now, does this work with shared_ptr? shared_ptr<BaseClass> objectPtr; objectPtr = shared_ptr<DerivedClass>(new DerivedClass()); and later, delete(objectPtr). Does any of the magic going on behind the scenes prevent shared_ptrs from being used like this? Merrill

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Re: [Boost-users] program_options: Failure Demo
by Merrill Cornish 25 Nov '05

25 Nov '05

Volodya, Should I post the ZIPs on boot-users or send it directly to you? Merrill

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Re: [Boost-users] program_options: Failure Demo
by Merrill Cornish 25 Nov '05

25 Nov '05

Volodya, I'm running Boost 1.33.0 compiled for MinGW multi-threaded. I agree that the message with only hex addesses isn't very useful, but that is all that pops up. ZoneAlert *says* the program is DWWIN.EXE, but I don't *see* Dr Watson. I disabled ZoneAlert and ran it again. I now have a 13KB Dr Watson log and a 3KB user.dmp file. Together, they ZIP to 4.8KB. Would you like me to send the ZIP to you? I have relinked the failing executable to remove unreferenced static libraries. It zips to 436KB. Would that be of any use to you? Merrill

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Question about boost::filesystem::path
by Stewart Tootill 25 Nov '05

25 Nov '05

I've just run into an interesting problem with boost::filesystem::path and thought I would raise it somewhere. When I run the following code, compiled with MSVC7.1, on windows XP I get an exception thrown when calling some_path_function. The exception is causes by boost::filesystem::path's implicit conversion constructor constructing a path from a string using the posix path matching rules. Obviously I can correct the problem by always using the native path checker argument, and that is fine, but the fact that this is an implicit conversion makes it hard to spot and I (and my colleagues) are not always that awake :). So I suppose the question is a) can the default path checking function be changed in such a way that on windows platforms it validates the path using windows rules and on posix platforms using posix rules, or b) should the constructor at fault here be made explicit since it can really catch you out. #include <boost/filesystem/path.hpp> #include <boost/filesystem/exception.hpp> #include <iostream> #include <string> void some_path_function( const boost::filesystem::path& path ) { std::cout << "Got a path : " << path.native_file_string() << std::endl; } int main() { try { std::string winPath = "c:\\windows\\system32\\kernel32.dll"; some_path_function( winPath ); } catch ( boost::filesystem::filesystem_error& err ) { std::cerr << "An error occured : " << err.what() << std::endl; } return 0; } Stewart Tootill Senior Engineer [Digital Text] Tel: +44 118 984 2151 - Fax: +44 118 984 3939 mailto:stewart.tootill@softel.co.uk www.softel.co.uk ________________________________________________________________________ This e-mail has been scanned for viruses by MessageLabs.

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program_options: Failure Demo
by Merrill Cornish 25 Nov '05

25 Nov '05

Below is a small program that demonstrates some of the problems I've been having. It takes one positional parameter, "limit" which is of type size_t. I'm linking statically with debug symbols. With the "try" in the position shown, after the declaration of vm, this is what happens to me for different command line arguments: * --limit=4 => works and prints limit=4 * --limt=4 => [notice misspelling] throws "unknown option limt" exception; but also triggers Dr. Watson: Application Error - The instruction at "0x0042eb49" referenced memory at "0x010900fb". The memory could not be "written". * --limit=-4 => [note negative value] never exits store(). Gets Dr. Watson "The instruction at "0x0049c090" referenced memory at "0x00eab651". The memory could not be "written. * --limit=xxx => [note string value] never exits store(). Get Dr. Watson with same message as above. Now, move the "try" to immediately after main() so all of the program options code is included in the try block. * --limit=4 => works as before * --limt=4 => [notice misspelling] Does NOT throw expected "unknown option" exception, never exits store(), but does trigger Dr. Watson, this time trying to read location 0xd. * --limit=-4 => similar error to above, with slightly different addresses. * --limt=xxx => similar error to above with slightly different addresses. Enjoy, Merrill //========================================== #include <iostream> #include "boost/program_options.hpp" using namespace std; namespace po = boost::program_options; int main(int argc, char* argv[]) { // try { po::options_description general("Option"); general.add_options() ("limit", po::value<size_t>()->default_value(1), " This is the concurrency limit."); po::variables_map vm; try { cout << "before store" << endl; po::store(po::command_line_parser(argc, argv). options(general).run(), vm); cout << "after store" << endl; po::notify(vm); if (vm.count("limit")) { cout << "limit=" << vm["limit"].as<size_t>() << endl; }//--version }//try catch (exception& e) { cerr << e.what() << endl; return 1; }//exception catch (...) { cerr << "unknown exception." << endl; return 1; }//... return 0; }//main() //=========================================

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Re: [Boost-users] Bind, lambda and how to chain relative function calls
by Kerner, Jacques 25 Nov '05

25 Nov '05

Erratum : Please replace ReturnArg by AdaptToReturningFunction in the AdaptToReturningFunction class definition. JK -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Kerner, Jacques Sent: Thursday, November 24, 2005 4:54 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Bind,lambda and how to chain relative function calls Hi, My example got a little bit more complicated. The Car::GetRigidBody function is : void Car::GetRigidBody(RigidBody & rb) instead of RigidBody & Car::GetRigidBody() So I have to write : bind ( &Position::GetX, bind ( &RigidBody::GetPosition, AdaptToReturningFunction<RigidBody>(bind(&Car::GetRigidBody, &car)) ) ) With a functor named AdaptToReturningFunction that transforms the first signature to the second : template<typename T> class AdaptToReturningFunction { public: ReturnArg(boost::function<void (T &)> f) : mF(f) {} T operator()() {T t; mF(t); return t;} private: boost::function<void (T &)> mF; }; Is there a simpler and better way of doing it without having to define AdaptToReturningFunction ? What if RigidBody was purely abstract (interface) ? Thank you. Jacques Kerner. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Peter Dimov Sent: Thursday, November 24, 2005 3:41 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Bind,lambda and how to chain relative function calls Kerner, Jacques wrote: > Hi, > > I would like to create a functor for calling functions in a chain like > this : > > car.GetRigidBody().GetPosition().GetX() > > What is the best way to do that using bind (and lambda ?) > > The car.GetRigidBody() is easy : bind(&Car::GetRigidBody, &car) , but > then I am a bit stuck. Note that I don't want to store the result of > car.GetRigidBody(). I want the final functor to call all the functions > everytime its operator() is called. So > > > bind ( > &Position::GetX, > &bind ( > &RigidBody::GetPosition, > &bind ( > > &Car::GetRigidBody, > &car > )() > )() > ) > > would not be acceptable... Just drop the invocations: bind ( &Position::GetX, bind ( &RigidBody::GetPosition, bind( &Car::GetRigidBody, &car) ) ) _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Re: [Boost-users] Bind, lambda and how to chain relative function calls
by Kerner, Jacques 25 Nov '05

25 Nov '05

Hi, My example got a little bit more complicated. The Car::GetRigidBody function is : void Car::GetRigidBody(RigidBody & rb) instead of RigidBody & Car::GetRigidBody() So I have to write : bind ( &Position::GetX, bind ( &RigidBody::GetPosition, AdaptToReturningFunction<RigidBody>(bind(&Car::GetRigidBody, &car)) ) ) With a functor named AdaptToReturningFunction that transforms the first signature to the second : template<typename T> class AdaptToReturningFunction { public: ReturnArg(boost::function<void (T &)> f) : mF(f) {} T operator()() {T t; mF(t); return t;} private: boost::function<void (T &)> mF; }; Is there a simpler and better way of doing it without having to define AdaptToReturningFunction ? What if RigidBody was purely abstract (interface) ? Thank you. Jacques Kerner. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Peter Dimov Sent: Thursday, November 24, 2005 3:41 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Bind,lambda and how to chain relative function calls Kerner, Jacques wrote: > Hi, > > I would like to create a functor for calling functions in a chain like > this : > > car.GetRigidBody().GetPosition().GetX() > > What is the best way to do that using bind (and lambda ?) > > The car.GetRigidBody() is easy : bind(&Car::GetRigidBody, &car) , but > then I am a bit stuck. Note that I don't want to store the result of > car.GetRigidBody(). I want the final functor to call all the functions > everytime its operator() is called. So > > > bind ( > &Position::GetX, > &bind ( > &RigidBody::GetPosition, > &bind ( > > &Car::GetRigidBody, > &car > )() > )() > ) > > would not be acceptable... Just drop the invocations: bind ( &Position::GetX, bind ( &RigidBody::GetPosition, bind( &Car::GetRigidBody, &car) ) ) _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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How to build the boost library
by Sui Tam 24 Nov '05

24 Nov '05

Hi, I am trying to use the boost C++ serialization library. Can you point me to how I can build the library on the itanium system? Also I would like to get some leads as to how I should start. I try using the VC project files, however, I see compilation errors. Sui --------------------------------- Yahoo! Music Unlimited - Access over 1 million songs. Try it free.

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Problem with boost::pool on MSVC8
by Georgios Diamantopoulos 24 Nov '05

24 Nov '05

Dear all, I am encountering a crash due to corrupted memory (_CrtIsValidHeapPointer assertion) when running a project that uses boost::fast_pool_allocator with std::list. This project is using mixed code. More specifically: - There is a native static library project named "KLT" which uses boost::fast_pool_allocator - klt.h is included in another, mixed (native+CLR) project where objects from klt.h are created The stack trace is shown below. It seems that this is a problem with static initialization of an object boost::pool makes. Does anyone have any idea as to what might be the problem? I am using the latest boost 1.33.1 compiled fresh with VC8. Thanks in advance. Best regards, Georgios STACK TRACE > msvcr80d.dll!_msize_dbg(void * pUserData=0xd0ac4d40, int nBlockUse=2) Line 1414 + 0x30 bytes C++ msvcr80d.dll!_dllonexit_nolock(int (void)* func=0x004219e0, void (void)* * * pbegin=0x0012e828, void (void)* * * pend=0x0012e820) Line 295 + 0xd bytes C msvcr80d.dll!__dllonexit(int (void)* func=0x004219e0, void (void)* * * pbegin=0x0012e828, void (void)* * * pend=0x0012e820) Line 273 + 0x11 bytes C MyVideoTool.exe!_onexit(int (void)* func=0x004219e0) Line 110 + 0x11 bytes C MyVideoTool.exe!atexit(void (void)* func=0x004219e0) Line 127 + 0x9 bytes C MyVideoTool.exe!boost::details::pool::singleton_default<boost::singleton_pool<boost::fast_pool_allocator_tag,80,boost::default_user_allocator_new_delete,boost::details::pool::win32_mutex,32>::pool_type>::instance() Line 83 + 0x32 bytes C++ MyVideoTool.exe!boost::details::pool::singleton_default<boost::singleton_pool<boost::fast_pool_allocator_tag,80,boost::default_user_allocator_new_delete,boost::details::pool::win32_mutex,32>::pool_type>::object_creator::object_creator() Line 66 + 0x28 bytes C++ MyVideoTool.exe!`dynamic initializer for 'boost::details::pool::singleton_default<boost::singleton_pool<boost::fast_pool_allocator_tag,80,boost::default_user_allocator_new_delete,boost::details::pool::win32_mutex,32>::pool_type>::create_object''() Line 50 + 0x28 bytes C++ [Managed to Native Transition] MyVideoTool.exe!_initterm(void** pfbegin = 0x00422214, void pfend = ) Line 130 C++ MyVideoTool.exe!<CrtImplementationDetails>::LanguageSupport::InitializeNative() Line 534 C++ MyVideoTool.exe!<CrtImplementationDetails>::LanguageSupport::_Initialize() Line 680 C++ MyVideoTool.exe!<CrtImplementationDetails>::LanguageSupport::Initialize() Line 824 + 0x9 bytes C++ MyVideoTool.exe!?.cctor@@$$FYMXXZ() Line 871 + 0x9 bytes C++ [Frames below may be incorrect and/or missing, no symbols loaded for mscorwks.dll] ntdll.dll!7c91b686() ntdll.dll!7c949e61() ntdll.dll!7c91b5f4()

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Serialization of ptr_container
by Merrill Cornish 24 Nov '05

24 Nov '05

Since I can find no specific mention that ptr_container classes can be serialized, I assume that means they can NOT be serialized. Right? Merrill

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about serialization
by czhu06-1＠yahoo.com.cn 24 Nov '05

24 Nov '05

Hi, I am using MSVC 7.1, and I need to use the boost_1_33_0 Serialization Library. But I can't make libs\serialization\example\demo.cpp work. It always pops memory alloc error. Can anybody kindly tell me how to make serialization library work? Thanks. --------------------------------- 雅虎邮箱超强增值服务－2G超大空间、pop3收信、邮件提醒

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Re: [Boost-users] Bind, lambda and how to chain relative function calls
by Kerner, Jacques 24 Nov '05

24 Nov '05

Thank you. I did not realize that it could work that way too. That's really great!!! Jacques. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Peter Dimov Sent: Thursday, November 24, 2005 3:41 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Bind,lambda and how to chain relative function calls Kerner, Jacques wrote: > Hi, > > I would like to create a functor for calling functions in a chain like > this : > > car.GetRigidBody().GetPosition().GetX() > > What is the best way to do that using bind (and lambda ?) > > The car.GetRigidBody() is easy : bind(&Car::GetRigidBody, &car) , but > then I am a bit stuck. Note that I don't want to store the result of > car.GetRigidBody(). I want the final functor to call all the functions > everytime its operator() is called. So > > > bind ( > &Position::GetX, > &bind ( > &RigidBody::GetPosition, > &bind ( > > &Car::GetRigidBody, > &car > )() > )() > ) > > would not be acceptable... Just drop the invocations: bind ( &Position::GetX, bind ( &RigidBody::GetPosition, bind( &Car::GetRigidBody, &car) ) ) _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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linking with visual studio .net 2003 and regex
by louis 24 Nov '05

24 Nov '05

Hi, I built regex as a library using the source (UNICODE char set but not with ICU support). I am able to link to the library in a console program but when I try and link to the library from an MFC project I get a bunch of unresolved errors. Here is one of them: myapp error LNK2019: unresolved external symbol "public: class boost::basic_regex<wchar_t,struct boost::regex_traits<wchar_t,class boost::w32_regex_traits<wchar_t> > > & __thiscall boost::basic_regex<wchar_t,struct boost::regex_traits<wchar_t,class boost::w32_regex_traits<wchar_t> > >::assign(wchar_t const *,wchar_t const *,unsigned int)" (?assign@?$basic_regex@_WU?$regex_traits@_WV?$w32_regex_traits@_W@boost@@@boost@@@boost@@QAEAAV12@PB_W0I@Z) referenced in function "public: class boost::basic_regex<wchar_t,struct boost::regex_traits<wchar_t,class boost::w32_regex_traits<wchar_t> > > & __thiscall boost::basic_regex<wchar_t,struct boost::regex_traits<wchar_t,class boost::w32_regex_traits<wchar_t> > >::assign(wchar_t const *,unsigned int)" (?assign@?$basic_regex@_WU?$regex_traits@_WV?$w32_regex_traits@_W@boost@@@boost@@@boost@@QAEAAV12@PB_WI@Z) Any help would be greatly appreciated

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Serialization documentation suggestion
by Merrill Cornish 24 Nov '05

24 Nov '05

It would be useful to Boost serialization users if there were a section in the serialization documentation titled, say, "Serialization Data Types" with a list such as * all built-in C++ data primitives * all STL containers * all Boost smart pointer types * boost::variant and any other Boost types that can be serialized (boost::any? boost::mutex? etc.) As it stands now, the serialization documentation mentions some, but the comments are scattered. The documentation is silent on other Boost-created data types. Merrill

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Re: [Boost-users] Serializing boost::variant?
by Merrill Cornish 24 Nov '05

24 Nov '05

Robert, >>> or you just do: >>> #include <boost/serialization/variant.hpp> I knew that a boost::variant data member in serialize() would compile, but--as the mathematicians say--the a necessary, but not sufficient condition. Thanks for verifying it. Merrill

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about installation
by Johnny Wong 24 Nov '05

24 Nov '05

Hi, I am using Borland C++ compiler 5.5, and I need to use the Boost Graph Library. But I am new to C++, so I downloaded the boost_1_33_0 but I don't know how to install and make it work. I have read the getting started guide, but I cannot follow the instructions. Can anybody kindly tell me how to do? Thanks. _______________________________________ �x��ӍϢ - Yahoo! Messenger ��]��ϾW��Կ��ӍϢ�o�㣬��ϾW�r��κ��fԒ��ʧ�� http://messenger.yahoo.com.hk

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Using Boost 1.33 with STLport 5.0 on MSVC71
by Wu Yinghui, Freddie 24 Nov '05

24 Nov '05

Dear all, I'm having a problem linking the simplest Boost unit_test program on the platform described above. More details here: Compiler: MSVC71 OS: WinXP Pro SP2 STLport 5.0 config: All default as obtained from CVS STLPORT_5_0 branch, except that I use /Zc:wchar_t to use wchar_t as built-in type. Boost 1.33/34: All default as obtained from CVS, built with the following command line: bjam --without-python "-sBUILD=debug release <runtime-link>static <threading>multi <stlport-version>5.0 <native-wchar_t>on <define>BOOST_SIGNALS_NAMESPACE=siglib" stage My simple unit_test program: ===== #include <string> #define BOOST_AUTO_TEST_MAIN #include <boost/test/auto_unit_test.hpp> BOOST_AUTO_UNIT_TEST( Test_Function ) { std::wstring string = L"some test string"; BOOST_CHECK( string.length() == 16 ); } ===== My project setting uses "Multi-threaded DLL (/MD)" in code gen, and links to "libboost_unit_test_framework-vc71-mt-sgdp.lib" in debug mode. My purpose was to use STLport in a DLL, but the whole Boost statically linked. (I know I can link with "libboost_unit_test_framework-vc71-mt-gdp.lib," but I want Boost to be statically linked.) The linker gives the following errors: stlportstld.5.0.lib(stlportstld.5.0.dll) : error LNK2005: "public: __thiscall stlpd_std::__owned_list::~__owned_list(void)" (??1__owned_list@stlpd_std@@QAE@XZ) already defined in libboost_unit_test_framework-vc71-mt-sgdp.lib(unit_test_suite.obj) stlportstld.5.0.lib(stlportstld.5.0.dll) : error LNK2005: "public: __thiscall stlpd_std::basic_string<char,class stlpd_std::char_traits<char>,class stlpd_std::allocator<char> >::~basic_string<char,class stlpd_std::char_traits<char>,class stlpd_std::allocator<char> >(void)" (??1?$basic_string@DV?$char_traits@D@stlpd_std@@V?$allocator@D@2@@stlpd_std@@QAE@XZ) already defined in libboost_unit_test_framework-vc71-mt-sgdp.lib(unit_test_suite.obj) stlportstld.5.0.lib(stlportstld.5.0.dll) : error LNK2005: "public: static void __cdecl stlpd_std::__node_alloc<1,0>::deallocate(void *,unsigned int)" (?deallocate@?$__node_alloc@$00$0A@@stlpd_std@@SAXPAXI@Z) already defined in libboost_unit_test_framework-vc71-mt-sgdp.lib(unit_test_suite.obj) stlportstld.5.0.lib(stlportstld.5.0.dll) : error LNK2005: "public: class stlpd_std::basic_string<char,class stlpd_std::char_traits<char>,class stlpd_std::allocator<char> > & __thiscall stlpd_std::basic_string<char,class stlpd_std::char_traits<char>,class stlpd_std::allocator<char> >::assign(char const *,unsigned int)" (?assign@?$basic_string@DV?$char_traits@D@stlpd_std@@V?$allocator@D@2@@stlpd_std@@QAEAAV12@PBDI@Z) already defined in libboost_unit_test_framework-vc71-mt-sgdp.lib(unit_test_log.obj) <more similar errors removed...> Is there any kind soul here can enlighten me a bit? Is it at all recommended (or even possible) to use STLport in DLL while statically linking with Boost? Cheers, Freddie -- Wu Yinghui, Freddie Research & Development Software Engineer Volume Interactions Pte Ltd 1 Kim Seng Promenade, #12-01 Great World City East Tower Singapore 237994 Tel: +65 62226962 (Ext 216) Fax: +65 62226215 Email: yhwu(a)volumeinteractions.com URL: http://www.volumeinteractions.com Important: This message is intended for the recipient(s) addressed above. It contains privileged and confidential information. If you are not the intended recipient, please notify the sender immediately by replying to this message and then delete it from your system. You must not read, copy, use, or disseminate this communication in any form. Thank you.

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Boost IRIX build problems
by Jeroen Akershoek 24 Nov '05

24 Nov '05

Hello, I'm trying to build boost on our SGI Onyx4 and am running into some problems. I've tried looking up some documentation for configuring the build-system a bit better, but couldn't find much. I don't have the time to dig into it and find it out myself, especially since building boost isn't my ultimate goal for this exercise, so I'm hoping you can help me out here I'm getting (a lot of occurances of) three errors throughout the build: 1) the indicated type is incomplete std::basic_istream<charT> m_is; // stream for parsing numbers. Not sure about this one. Missing include somewhere or maybe SGIs STL is f00bar 2) The indicated enumeration value is out of "int" range. enum npos_type { npos = (size_type)-1 }; I assume it's the same problem as with IBMCPP. Don't know if MIPSpro can have 64-bits enums. 3) Threading is disabled: _SGI_MP_SOURCE is undefined If somebody could help me out with these, I'd be very grateful. My environment is IRIX 6.5.27 with MIPSpro 7.41, bjam 3.1.11 and I'm trying boost 1.33.0. I've modified the tools/build/v1/mipspro-tool.jam to use -64 and -mips4 as default. Probably not the way to do it, but I couldn't find the "proper" way within decent time Kind regards, Jeroen -- Jeroen Akershoek SARA - High Performance Computing & Visualization dep. tel: +31 20 5923000 fax: +31 20 6683167 Draco dormiens nunquam titillandus

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Complaint about Current Boost Build System
by Wu Yinghui, Freddie 24 Nov '05

24 Nov '05

Hi all, Sorry for this e-mail, since it is more of a complaint. But I do feel the urge to raise this problem to the community so that some solution could be derived soon. The current build system (1.33/34 from CVS) creates subdirectories for each variant/ subvariant specified in the BUILD environment. When more user customizations are specified, the consequence of this is very deep directory structures. Nonetheless, some OSes imposes stringent limits on how long a path can go (e.g., Win2k/XP limits a path name to be 259 characters long maximum). There causes big problem with the building system when error can occur from nowhere in Boost source code itself. This constraint effectively limits how much customization a user can make (e.g., I had to remove some additional optimization/ tuning parameters for subvariants, and SUBST'ed the Boost directory in order to reduce the path name length). So my question is, why can we not be smarter in this to derive alternatives to make the directory structure shallower (or, simply reduce the length of the names of each subvariant directory)? Sorry again if this sound too demanding, but I do consider it an important usability limitation of the current Boost build system. Cheers, Freddie -- Wu Yinghui, Freddie Research & Development Software Engineer Volume Interactions Pte Ltd 1 Kim Seng Promenade, #12-01 Great World City East Tower Singapore 237994 Tel: +65 62226962 (Ext 216) Fax: +65 62226215 Email: yhwu(a)volumeinteractions.com URL: http://www.volumeinteractions.com Important: This message is intended for the recipient(s) addressed above. It contains privileged and confidential information. If you are not the intended recipient, please notify the sender immediately by replying to this message and then delete it from your system. You must not read, copy, use, or disseminate this communication in any form. Thank you.

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Serializing boost::variant?
by Merrill Cornish 24 Nov '05

24 Nov '05

If I have a boost::variant data member I want to serialize, it looks like I'm going to have to use boost::static_visitor and boost::apply_visitor in the serialize() method. However, there is some black magic going on with the ar & dataMember; statements. Any pointers as to how I do it? Merrill

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Bind, lambda and how to chain relative function calls
by Kerner, Jacques 24 Nov '05

24 Nov '05

Hi, I would like to create a functor for calling functions in a chain like this : car.GetRigidBody().GetPosition().GetX() What is the best way to do that using bind (and lambda ?) The car.GetRigidBody() is easy : bind(&Car::GetRigidBody, &car) , but then I am a bit stuck. Note that I don't want to store the result of car.GetRigidBody(). I want the final functor to call all the functions everytime its operator() is called. So bind ( &Position::GetX, &bind ( &RigidBody::GetPosition, &bind ( &Car::GetRigidBody, &car )() )() ) would not be acceptable... Any help greatly appreciated Jacques Kerner

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Tuple operator==
by Josue Gomes 23 Nov '05

23 Nov '05

Hi, Take this code: #include <string> #include <boost/tuple/tuple.hpp> struct A {}; bool operator==(A, A) { return true; } int main() { using namespace boost; tuple<std::string, int, A> t1(std::string("same?"), 2, A()); tuple<std::string, long, A> t2(std::string("same?"), 2, A()); tuple<std::string, long, A> t3(std::string("different"), 3, A()); t1 == t2; // error: no match for operator== t1 == t3; // error: no match for operator== } This is similar to the example shown in Boost.Tuple docs. However the compiler(*) refuses to compile it. I tried it with versions 1.33.0 and 1.33.1 (Beta) Any ideas? Compiler outputs below: MSC C/C++ Compiler 13.10;3077 cl /GR /EHsc /IE:\projects\libraries\boost_1_33_1 tuple_error.cpp Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.3077 for 80x86 Copyright (C) Microsoft Corporation 1984-2002. All rights reserved. tuple_error.cpp tuple_error.cpp(17) : error C2678: binary '==' : no operator found which takes a left-hand operand of type 'boost::tuples::tuple<T0,T1,T2>' (or there is no acce ptable conversion) with [ T0=std::string, T1=int, T2=A ] tuple_error.cpp(18) : error C2678: binary '==' : no operator found which takes a left-hand operand of type 'boost::tuples::tuple<T0,T1,T2>' (or there is no acce ptable conversion) with [ T0=std::string, T1=int, T2=A ] gcc 3.4.4 g++ -I E:\projects\libraries\boost_1_33_1 tuple_error.cpp -o tuple_error_gcc.exe tuple_error.cpp: In function `int main()': tuple_error.cpp:17: error: no match for 'operator==' in 't1 == t2' tuple_error.cpp:7: note: candidates are: bool operator==(A, A) tuple_error.cpp:18: error: no match for 'operator==' in 't1 == t3' tuple_error.cpp:7: note: candidates are: bool operator==(A, A) Regards, Josue

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Re: [Boost-users] Collections of shared_ptr<Base> and shared_ptr<Derived>
by Keith Weintraub 23 Nov '05

23 Nov '05

Michael, Thanks for the reply. You are absolutely right. I'm coming back to C++ after years of Java and I haven't been careful enough about reading the stl docs. One quibble with your solution is that I am doing an upcast not a down cast, but your solution worked perfectly for me. Thanks all, KW ________________________________________________ Date: Mon, 21 Nov 2005 15:29:29 -0800 From: Michael Rickert <pandamojo(a)gmail.com> Subject: Re: [Boost-users] Collections of shared_ptr<Base> and shared_ptr<Derived> To: boost-users(a)lists.boost.org Message-ID: <561a17f20511211529l1a528314od7905edcc2aa2ab7(a)mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 On 11/21/05, Keith Weintraub <Keith(a)archeuscap.com> wrote: > > > > Folks, > > I have come up with the following solution in template form. I would be ecstatic to receive any feedback on either my solution or original question. I am not an expert in these things and I can use all the help any generous soul could provide. > > > > Here is my solution: *snip* It would seem you're overengineering things. It'd be simpler just to use std::vector's iterator constructors: std::vector< boost::shared_ptr< derived > > data; ... std::vector< boost::shared_ptr< base > > downcast_data( data.begin() , data.end() ); If you wanted to go with your original version, I'd suggest returning a managed pointer of some sort (std::auto_ptr or boost::shared_ptr) to decrease the likelyhood of a leak - or having the user pass a nonconstant reference to a vector to fill. Sorry if this has allready been covered by the time this is recieved, my posts seem to still be awaiting moderator approval. -Mike

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[Announce] Boost Graph Library Python Bindings Version 0.9
by Douglas Gregor 23 Nov '05

23 Nov '05

Version 0.9 of the Boost Graph Library Python bindings has been released. The BGL-Python bindings provide access to many of the features of the C++ Boost Graph Library from Python, blending the rapid prototyping and application development capabilities of Python with the power and performance of C++. BGL-Python is the successor to the experimental Python bindings found in Boost 1.33.0, providing more algorithms, better data structures, and drastically improved documentation. The BGL-Python bindings are available at: http://www.osl.iu.edu/~dgregor/bgl-python/ Doug

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Re: [Boost-users] Compiling with Visual C++ 2005 Express Edition
by Keith Weintraub 23 Nov '05

23 Nov '05

Folks, Thanks for all the kind help. I solved my problem by doing something similar to what Mr Kozicki suggested. Only I did it on the command line. All works fine now. Thanks again, KW

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Newbie build problem
by Rob Marsden 23 Nov '05

23 Nov '05

I too am having similar problems to Keith Weintraub with regard to failed and skipped targets. I applied the suggested addition of the Platform SDK, to the include paths, but in the process I had to reboot my machine (for unrelated reasons). Since then, I get virtually nothing actually built (quite a leap backwards really :-) The symptom I get is related to expansion of the compiler name, as the messages are all of the type: '/Zm800' is not recognised as an internal command... etc or '/nologo' is not ... The environment is Win2K with VC6 and the Intel compiler v8.0 (9 on order). The command line is bjam "-sTOOLS=intel-win32" install Now there's a certain familiarity about this problem, but at my age, memory doesn't serve me all that well. So what's the answer? -- Rob Marsden Gistix (Northern) Limited

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boost.thread problem
by magazine.lihuiba 23 Nov '05

23 Nov '05

I'm a newbie to boost, and I'm trying to use boost.thread together with STLport in VC6. When I compile my project in debug version, I get a error message saying "fatal error C1189: #error : 'Build options aren't compatible with pre-built libraries'", the error code is in auto_link.hpp in boost directory: # if (defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)) && (defined(_STLP_OWN_IOSTREAMS) || defined(__STL_OWN_IOSTREAMS)) # if defined(_DEBUG) && (defined(__STL_DEBUG) || defined(_STLP_DEBUG)) # define BOOST_LIB_RT_OPT "-gdp" # elif defined(_DEBUG) # define BOOST_LIB_RT_OPT "-gdp" # pragma message("warning: STLPort debug versions are built with /D_STLP_DEBUG=1") # error "Build options aren't compatible with pre-built libraries" # else # define BOOST_LIB_RT_OPT "-p" # endif But I don't get this error message in release version. What can I do?

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[program_options] Finding out the type of the options
by Giuseppe Vacanti 23 Nov '05

23 Nov '05

Hello, I'm using program_options, and I want to be able to learn what the option type is by manipulating an options_description object. As I illustrate in the example below (boost 1.33), I can do this if the option has been given a default value. Could anyone suggest a wasy to this for options without a default? The story behind this question is that I would like to be able to build a simple GUI parameter dialog based on the options_description, and I want to map different types to different widgets. Thanks, Giuseppe #include <boost/program_options.hpp> #include <boost/filesystem/path.hpp> #include <iostream> #include <vector> #include <string> #include <algorithm> #include <iterator> template<typename T> bool type_is (const boost::any & v) { return v.type() == typeid(T); } struct MyType { MyType() : x(0) {} MyType(double d) : x(d) {} double x; }; std::ostream & operator<<(std::ostream & os, const MyType & mt) { os << mt.x; return os; } std::istream & operator>>(std::istream & is, MyType & mt) { is >> mt.x; return is; } using namespace std; namespace po = boost::program_options; int main(int ac, char * av[]) { typedef vector<string> type; po::options_description desc1("Allowed options 1"); desc1.add_options() ("switch", po::value<bool>(), " a boolean switch") ("numbers", po::value<type>(), "a list of numbers") ("number", po::value<double>()->default_value(42), "the number") ; po::options_description desc2("Allowed options 2"); desc2.add_options() ("mytype", po::value<MyType>()->default_value(MyType(123.4)), "my type") ; po::options_description cmdlinedesc; cmdlinedesc.add(desc1).add(desc2); po::variables_map vm; po::store(po::parse_command_line(ac, av, cmdlinedesc), vm); po::notify(vm); typedef std::vector< boost::shared_ptr<po::option_description> > VOD; const VOD & pk = cmdlinedesc.options(); for(VOD::const_iterator K = pk.begin(); K != pk.end(); ++K){ cout << " [ " << (*K)->long_name() << " - " << (*K)->description() << " ] "; boost::shared_ptr< const po::value_semantic > sem = (*K)->semantic(); boost::any default_store; bool has_default = sem->apply_default(default_store); if(has_default) cout << " has default "; if(type_is<double>(default_store)) cout << " = (double) " << boost::any_cast<double>(default_store); if(type_is<bool>(default_store)) cout << " = (bool) " << boost::any_cast<bool>(default_store); if(type_is<MyType>(default_store)){ MyType x = boost::any_cast<MyType>(default_store); cout << " = (MyType) " << x; } cout << endl; } }

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progress_timer, incorrect timing
by __PPS__ 23 Nov '05

23 Nov '05

I got strange results with boost::progress_timer - it shows timings like 1.45s whereas it took about 15 sec. to complete a routine. It used to work ok, but I have no idea why it just doesn't work anymore! I use freebsd 4.11 and clocks_per_sec is defined 128. sysconf(_SC_CLK_TCK) also returns 128, but clock counter is not correct completely. I wrote simple test class, to see what's wrong: struct Timer { clock_t t; time_t tt; Timer() : t(clock()), tt(time(0)){} ~Timer(){ std::cout << "Elapsed interval: " << (static_cast<double>(clock() -t))/CLOCKS_PER_SEC << "s " << (time(0)-tt) << "s\n" ; } }; this is the output: Elapsed interval: 1.52344s 33s 1.52 s <- output by boost::progress_timer. so, you may see that measured time is completely wrong. I rewrote it with microtime(...) and it works correctly now. any ideas what's wrong, why clock() doesn't work anymore? Wouldn't that be a good idea to use microtime for unices? thanks

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Compiling with Visual C++ 2005 Express Edition
by Keith Weintraub 23 Nov '05

23 Nov '05

Folks, I am having trouble compiling and building boost with Visual C++ 2005 Express Edition. It gets a lot of the job done with the command (under cygwin): bjam "-sTOOLS=vc-8_0" "-svc80_ROOT=C:\Program Files\Microsoft Visual Studio 8\VC" That directory is where my VC++ is installed. In addition the bjam script (which I treat as a black box) could not find the vsvers32.bat script which I ran by hand. I had to do that to get anything to work. The last run that I did ignored about 126 "targets" and had errors in 82 "targets". Some (maybe all, since they all scrolled by so quickly) said that windows.h could not be found. Can anyone help me with this? Thanks for your time, KW

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Re: [Boost-users] program_options: wild write
by Peter Whaite 22 Nov '05

22 Nov '05

Vladimir Prus <ghost(a)cs.msu.su> wrote: > Merrill Cornish wrote: > > > graph_file is a positional parameter. So should it be added to the > > option_description list? > > Yes, how else would you specify the type of the value? > positional_options_description only specifies translation from > position on the command line to option name, the option still has to > be registered. I've added a warning to the docs. I'm sure a warning will help as that's not at all obvious in the current documentation. A comment in the example would be useful too. It took me a while for the penny to drop the first time I used this library. FWIW my (now obviously erroneous) reasoning was that a positional_options_description was just another kind of options_description, and that "input-file" was in both of them in example/program_options.cpp so it could be used as both an option and a positional argument. I only wanted it as a positional parameter, so I omitted it from the options_description. I also found myself wanting to generate a usage message like this... po::positional_options_description pd; cout << "Usage: " << progname << " [options]" << pd << endl; rather than having to loop through pd. But these are minor things. Thank you for a very useful library. --- Peter Whaite.

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Re: [Boost-users] lambda and shared_ptr?
by Mark Santaniello (AMD) 22 Nov '05

22 Nov '05

> Mark Santaniello (AMD) wrote: > >>> template< typename T > > >>> boost::function<T(T)> foo( T n_ ) > >>> { > >>> //Works, but leaks n > >>> //T *n = new T( n_ ); > >>> > >>> //Doesn't work > >>> boost::shared_ptr<T> n( new T(n_) ); > >>> > >>> return ( *n += _1 ); > >> > >> I think that you need to wrap n in boost::lambda::constant: > >> > >> return *constant(n) += _1; > >> > >> Without it, *n is evaluated immediately. > >> > >>> } > >> > > > > Peter, > > > > Thanks for the reply. I must be doing something dumb, > because now I'm > > getting a build error. > > > > I think this *might* be the important part: > > /usr/include/boost/detail/is_incrementable.hpp:59: error: > no match for > > 'operator++' in > > > '++boost::detail::is_incrementable_::impl<boost::shared_ptr<int> >::x' > > Apparently, boost::detail::is_incrementable doesn't work on > your compiler; this in turn breaks boost::indirect_reference > and the return type deduction for lambda's operator*. But I > should also note that *constant(n) += _1 doesn't seem to work > even when the compiler supports is_incrementable, because for > some reason, Lambda thinks that dereferencing a const pointer > yields a const reference. > > return ret<int&>( *constant(pn) ) += _1; > > compiles for me, though. > Ahh, thanks Peter this helps a ton. Seems like gcc 4.0.2 doesn't like is_incrementable. I tried gcc 3.3.6, however, and it worked fine. I also had success with MSVC 8.0. -Mark

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[iostreams] stream and ios_base::binary
by Pedro Lamarão 22 Nov '05

22 Nov '05

Is there a way to construct a boost::iostreams::stream with the ios_base::binary flag? I'd be really happier without the line-ending treatment... -- Pedro Lamarão

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[serialization] Incorrect assertion in basic_binary_oprimitive?
by Zach Laine 22 Nov '05

22 Nov '05

I agree with the objection raised by the original poster. The assertion in archive/basic_binary_oprimitive.hpp should more properly be an exception. Standard library ostreams fail silently when in an error state (including std::ofstreams that fail to open a file). Writing a std::string, int, double, or any other data to a default-constructed std::ostream is a no-op. The only exception to this appears to be writing a boost::serialization archive to a std::ostream, which under some circumstances fails with an abort when "assert(os.good());" fails in archive/basic_binary_oprimitive.hpp. There is also an exception thrown based on the state of the ostream in the same function as this assertion. The user can choose to catch this if she decides that the default std::ostream failure policy (a no-op) is acceptible. By putting the assertion in there, you force the user to always have a valid, writable std::ostream, which is precisely the opposite of what the user expects from years of using std::ostreams.

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Re: [Boost-users] program_options: wild write
by Merrill Cornish 22 Nov '05

22 Nov '05

Pedro, graph_file is a positional parameter. So should it be added to the option_description list? By the way, in one run in which I provided one positional parameter on the command line, the code then recognized graph_file; but claimed it was an unknown option. [sigh...] Merrill

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serialization: efficient binary archive
by __PPS__ 22 Nov '05

22 Nov '05

Hello, I want to write simple binary searialization class. the serialized data should be as compact as possible, e.g. I don't want to have "serialization::archive" string etc, since most of the time I need really basic serialization performed into many separate archives: something like hunrdreds of archives that contain simple int, or string. I also don't need any versioning. These data serializations are for a short period of time (automatically removed after a few minutes), to share data between multiple processes on the same machine. Basicly, I need to serialize many key-value pairs, and then to be able to extract values by their keys. Keys are simple strings, values can be anything. Since I cannot use boost::any for value part, then I decided to go a way around. I'll have a map that maps string keys to the serialized binary string of value, and then this big map is serialized. The other process then deserializes this map and if it accesses some value it also needs to deserialize the value. I really need simple searialization, something like i:1234,s[5]:Hello for int(1234) and string("Hello") with all the numbers serialized in binary etc, without any BE/LE code - always the same machine used. I think it would be really enough for me to have serialization of numbers, strings and binary data, but I want to use boost::serialization to allow users to insert objects of their own classes in that key-value pairs. basicly, my goal is to create such class that maps string keys to any data, then all this map is serialized and some other process deserializes this map and accesses values by keys. Is there's something in serialization library you could suggest me to look at. I viewed demo_fast_archive, but I cannot find good info on creating my own archive classes. It seems that my problem would be completely solved if there were some way to serialize boost::any, in this case I would only needed to serialize std::map<std::string,boost::any> thanks

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program_options: wild write
by Merrill Cornish 22 Nov '05

22 Nov '05

I'm making progess on using program_options. Using std::exception& gave me the real error message; but problems still remain. po::options_description desc("Options"); desc.add_options() ("help,h", " Display this help message.") ("version", " Display the version... .") ("limit", po::value<unsigned int>()->default_value(1), " This is the concurrency limit ...") ); // specify the single, required graph file positional parameter po::positional_options_description pd; pd.add("graph_file", 1); po::variables_map vm; po::store(po::command_line_parser(argc, argv). options(desc). positional(pd).run(), vm); po::notify(vm); //... code that references vm... I still can't get the positional parameter, but I've got other problem to research first. The options_descriptions above defines --limit as an unsigned integer with a default value of 1. It does get a default value of 1, and it will let you specify another unsigned integer value. But if you specify a non-unisgned integer (e.g., --limit=xxx or --limit=-5), then it bypasses the exception handling and calls Dr. Watson. The reported error is a wild write to unwritable memory. Any ideas how to chase this problem? Merrill

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[serialization] trouble with member_saver / member_save ?
by William Kemper 22 Nov '05

22 Nov '05

In 1.33.0 split_member uses: template<class Archive, class T> struct member_saver { static void invoke( Archive & ar, const T & t, const unsigned int file_version ){ access::member_save(ar, t, file_version); } }; And member_save looks like: template<class Archive, class T> static void member_save( Archive & ar, //const T & t, T & t, const unsigned int file_version ){ t.save(ar, file_version); } So the compiler complains about converting a const T to a non const T. It's curious that the source has the const T& in member_save commented out. Is there a workaround for this? Or is it planned to be fixed in the next release?

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Re: [Boost-users] lambda and shared_ptr?
by Mark Santaniello (AMD) 22 Nov '05

22 Nov '05

> > template< typename T > > > boost::function<T(T)> foo( T n_ ) > > { > > //Works, but leaks n > > //T *n = new T( n_ ); > > > > //Doesn't work > > boost::shared_ptr<T> n( new T(n_) ); > > > > return ( *n += _1 ); > > I think that you need to wrap n in boost::lambda::constant: > > return *constant(n) += _1; > > Without it, *n is evaluated immediately. > > > } > Peter, Thanks for the reply. I must be doing something dumb, because now I'm getting a build error. I think this *might* be the important part: /usr/include/boost/detail/is_incrementable.hpp:59: error: no match for 'operator++' in '++boost::detail::is_incrementable_::impl<boost::shared_ptr<int> >::x' The 799B source file is here: http://mark.santaniello.net/files/hof2.cpp The 19KB error message is here: http://mark.santaniello.net/files/err.txt :) -Mark

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The fate of has_member?
by Sniv Le Flomp 22 Nov '05

22 Nov '05

Hi, What ever happened with has_member? I really need it. - Sniv

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Re: [Boost-users] program_options: wild write
by Merrill Cornish 22 Nov '05

22 Nov '05

Christian, If I put an unknown --option on the command line, I get an exception with an "unknown option" message, just as you would expect. If I omit --limit from the command line, then it gets defaulted to 1, just as it should. However, if I put --limit on the command line with an illegal value, say a string or a negative number rather than an unsigned int, then there is no exception message, even though I am catching std::exception& and (...) and printing a message for both. Instead, Dr Watson is called, apparently without triggering a C++ exception. Merrill

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lambda and shared_ptr?
by Mark Santaniello (AMD) 22 Nov '05

22 Nov '05

All, I'm trying to use lambda and shared_ptr together, but I'm running into a problem. Please see the code below. I'd like the lambda-generated functor to hold the shared_ptr by value, such that its ref count is incremented. This doesn't seem to be happening. Instead, the shared_ptr is deleted when foo() returns, resulting in undefined behavior. What am I doing wrong? Thanks, Mark #include <boost/lambda/lambda.hpp> #include <boost/function.hpp> #include <boost/shared_ptr.hpp> #include <iostream> using namespace std; using namespace boost::lambda; template< typename T > boost::function<T(T)> foo( T n_ ) { //Works, but leaks n //T *n = new T( n_ ); //Doesn't work boost::shared_ptr<T> n( new T(n_) ); return ( *n += _1 ); } int main() { // start with one boost::function<int(int)> accum = foo(1); cout << accum(2) << endl; cout << accum(10) << endl; // start with zero boost::function<int(int)> accum2 = foo(0); cout << accum2(6) << endl; cout << accum2(2) << endl; }

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Re: [Boost-users] Collections of shared_ptr<Base> and shared_ptr<Derived>
by Keith Weintraub 21 Nov '05

21 Nov '05

Folks, I have come up with the following solution in template form. I would be ecstatic to receive any feedback on either my solution or original question. I am not an expert in these things and I can use all the help any generous soul could provide. Here is my solution: // Function template to create a vector<shared_ptr<Base> >* from // a vector<shared_ptr<Derived> > template<typename Base, typename Derived> vector<shared_ptr<Base> > *derivedSharedPtrVectorToBase(vector<shared_ptr<Derived> > const &dVec) { vector<shared_ptr<Base> > *bVec = new vector<shared_ptr<Base> >(dVec.size()); for(int i = 0; i < dVec.size(); i++) (*bVec)[i] = dVec[i]; return(bVec); } Thanks for your time, KW ________________________________ From: Keith Weintraub Sent: Wednesday, November 16, 2005 10:17 AM To: 'boost-users(a)lists.boost.org' Subject: Collections of shared_ptr<Base> and shared_ptr<Derived> Folks, What is the best way to pass a std::vector<boost::shared_ptr<Derived> > to a function that expects a std::vector<boost::shared_ptr<Base> >? Can I use a cast or should I create a new std::vector<boost::shared_ptr<Base> > by iterating over the std::vector<boost::shared_ptr<Derived> >? Here is some sample code. What f is doing is not important it is just an example: class A { // This class is from a library I have no control over. public: virtual string getName() { return string("A");} }; class B : public A { // I need to create B from A to have extra functionality public: virtual string getName() { return string("B");} virtual string getLongName() { return string("This is B");} }; void f(std::vector<boost::shared_ptr<A> > &v) { // This function is from a library that I have no control over. for(int i = 0; i < v.size(); i++) cout << v[i]->getName(); } int main(char *argv, int arc) { std::vector<boost::shared_ptr > bvec(10); boost::shared_ptr bPtr(new B); bvec[0] = bPtr; f(bvec); // This should not compile. <------------------------- } The last line (with the arrow) won't compile because std::vector<boost::shared_ptr > cannot be converted to std::vector<boost::shared_ptr<A> >.

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[BGL, Graph] add_vertex with specific ctor
by Johan Oudinet 21 Nov '05

21 Nov '05

Hello, I like the named parameter method to define graph properties, so all our properties are concentrated in a struct. But, I'd like add a vertex with specific properties are already defined: //======================= #include <iostream> #include <string> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> using namespace std; using namespace boost; struct People { People () { } People (string const& n, int a) : name(n), age(a) { } string name; int age; }; int main(int, char**) { typedef adjacency_list< vecS, vecS, bidirectionalS, People > Graph; typedef graph_traits< Graph >::vertex_descriptor vertex_descriptor; Graph g; vertex_descriptor v; People n ("toto", 26); v = add_vertex (g); // this use the default ctor of People, a add_vertex(g, n) g[v] = n; // will be more efficiently (avoid a People assignment) cout << g[v].name << " is " << g[v].age << " old." << endl; } //======================= -- Johan

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Re: [Boost-users] Q: Graphs. Sorting edges. Possible? How to?
by Jeff Holle 21 Nov '05

21 Nov '05

I've found this partial solution for what I'm searching for. This code sorts by target, name. I want to sort by source, target. I find that in boost::graph adjacency_list edge descriptors there is a "get_target" method, but no "get_source" method. Can someone tell me how to either find the equivalent or give the comparison function object a non-default constructor so I can pass it a graph reference? Actually in the latter, I need assistance in feeding the graph reference to the graph object at construction time, not writing a constructor. Jeremy Siek wrote: > On Wed, 19 Jun 2002, stas_fomin wrote: > stas_f> > By using a custom container (use a std::set with your custom > stas_f> comparison > stas_f> > function) for the EdgeList type, you can get the out-edges of each > stas_f> vertex > stas_f> > sorted, but there currently is not a way to get the entire edge list > stas_f> > sorted. > stas_f> Ok... But BGL docs is less understandable (in comparison with > stas_f> LEDAbook) for me (I know I am stupid). > > Have you tried reading the BGL book? > > stas_f> So, please, show me small example of declaration > stas_f> of some graph with out_edges sorted according to some function... > > Here you go. Also, this example is checked into the libs/graph/example/ > directory. > > #include <boost/config.hpp> > #include <iostream> > #include <functional> > #include <string> > > #include <boost/graph/adjacency_list.hpp> > #include <boost/graph/properties.hpp> > > /* > Sample output: > > 0 --chandler--> 1 --joe--> 1 > 1 --chandler--> 0 --joe--> 0 --curly--> 2 --dick--> 3 --dick--> > 3 > 2 --curly--> 1 --tom--> 4 > 3 --dick--> 1 --dick--> 1 --harry--> 4 > 4 --tom--> 2 --harry--> 3 > > name(0,1) = chandler > > name(0,1) = chandler > name(0,1) = joe > > */ > > template <class StoredEdge> > struct order_by_name > : public std::binary_function<StoredEdge,StoredEdge,bool> > { > bool operator()(const StoredEdge& e1, const StoredEdge& e2) const { > // Order by target vertex, then by name. > // std::pair's operator< does a nice job of implementing > // lexicographical compare on tuples. > return std::make_pair(e1.get_target(), boost::get(boost::edge_name, > e1)) > < std::make_pair(e2.get_target(), boost::get(boost::edge_name, e2)); > } > }; > struct ordered_set_by_nameS { }; > > #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION > namespace boost { > template <class ValueType> > struct container_gen<ordered_set_by_nameS, ValueType> { > typedef std::multiset<ValueType, order_by_name<ValueType> > type; > }; > template <> > struct parallel_edge_traits<ordered_set_by_nameS> { > typedef allow_parallel_edge_tag type; > }; > } > #endif > int > main() > { > #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION > std::cout << "This program requires partial specialization" << > std::endl; > #else > using namespace boost; > typedef property<edge_name_t, std::string> EdgeProperty; > typedef adjacency_list<ordered_set_by_nameS, vecS, undirectedS, > no_property, EdgeProperty> graph_type; > graph_type g; > > add_edge(0, 1, EdgeProperty("joe"), g); > add_edge(1, 2, EdgeProperty("curly"), g); > add_edge(1, 3, EdgeProperty("dick"), g); > add_edge(1, 3, EdgeProperty("dick"), g); > add_edge(2, 4, EdgeProperty("tom"), g); > add_edge(3, 4, EdgeProperty("harry"), g); > add_edge(0, 1, EdgeProperty("chandler"), g); > > property_map<graph_type, vertex_index_t>::type id = get(vertex_index, > g); > property_map<graph_type, edge_name_t>::type name = get(edge_name, g); > > graph_traits<graph_type>::vertex_iterator i, end; > graph_traits<graph_type>::out_edge_iterator ei, edge_end; > for (boost::tie(i, end) = vertices(g); i != end; ++i) { > std::cout << id[*i] << " "; > for (boost::tie(ei, edge_end) = out_edges(*i, g); ei != edge_end; > ++ei) > std::cout << " --" << name[*ei] << "--> " << id[target(*ei, g)] << " > "; > std::cout << std::endl; > } > std::cout << std::endl; > > bool found; > typedef graph_traits<graph_type> Traits; > Traits::edge_descriptor e; > Traits::out_edge_iterator e_first, e_last; > > tie(e, found) = edge(0, 1, g); > if (found) > std::cout << "name(0,1) = " << name[e] << std::endl; > else > std::cout << "not found" << std::endl; > std::cout << std::endl; > > tie(e_first, e_last) = edge_range(0, 1, g); > while (e_first != e_last) > std::cout << "name(0,1) = " << name[*e_first++] << std::endl; > #endif > return 0; > } > > > > ---------------------------------------------------------------------- > Jeremy Siek http://php.indiana.edu/~jsiek/ > Ph.D. Student, Indiana Univ. B'ton email: jsiek(a)osl.iu.edu > C++ Booster (http://www.boost.org) office phone: (812) 855-3608 > ---------------------------------------------------------------------- > > >

2 1

Boost::thread scheduling under HPUX
by Pete 21 Nov '05

21 Nov '05

Under heavy load, my HP-UX 11i application can run multiple, CPU intensive boost::thread's. Unfortunately, this has the side effect that other processes suffer in terms of performance. I initially thought that decreasing the nice value of my app would do the trick and ensure that other processes with a higher value would get priority by the kernel scheduler. However, this does not appear to be true (my app's nice value is 30 when most other processes run at 20). The requirement of my app is to run only whenever the system is idle. Is there a way this can be done using boost::thread or does anybody know how I could configure my process under HP-UX so that it behaves as intended?

2 2

program_options: St9exception Exception?
by Merrill Cornish 21 Nov '05

21 Nov '05

I posted a question earlier about why I couldn't get Boost 1.33.0 program_options to "see" my positional parameter and why it bombed on unexpected options. Volodya pointed out that an illegal option throws an exception and asked if I had a catch. I felt like a fool for forgetting exceptions and through that was the problem. Then I looked at the code again. The method that uses program_options to read the command line had no try/catch, but the main program that called that method DID have the call wrapped in a try that has catches both for std::exception and (...). And yet, it wasn't trapping anything. Between ZoneAlert and Windows, I *think* I know the problem: something is attempting to access NULL, so I'm getting an OS memory error that C++ exceptions can't catch. I moved try's and catch's around in the code until I found the offending statement: po::variables_map vm; ...a declaration of all things. Here's an excerpt of the code po::options_description desc("Options"); desc.add_options() ("help,h", " Display this help message.") ("version", " Display the version.") // ... other options ;//add-options() // specify the single, required graph file positional parameter po::positional_options_description pd; pd.add("graph_file", 1); po::variables_map vm; //<============== try { po::store(po::command_line_parser(argc, argv). options(desc). positional(pd). run(), vm); po::notify(vm); // ... other code that references vm }//try catch(std::exception e) { cerr << "Exception:" << endl; cerr << e.what() << endl; exit(EXIT_FAILURE); }//catch catch(...) { cerr << "An unknown exception occurs while parsing : "command line arguments." << endl; exit(EXIT_FAILURE); }//catch Using the 'try' in the position shown above, if I input an unexpected command line options, an exceptioin is thrown whose what() method returns "St9exception". That's it. Just "St9exception". I can't find that string in the Boost source anywhere. However, if I move the "try" up one statement so it's above "po::variables_map vm;", then there's no exceptoin, but the access to location 0. That's one picky declaration. Merrill

3 2

multi_array - changing number of elements
by fritz.birnbacher＠t-online.de 21 Nov '05

21 Nov '05

Hello, how can I change the number of elements in an array ? I want to do following: typedef boost::multi_array<double, 2> array_type; array_type::extent_gen extents; array_type A1(extents[2][3]); array_type A2; A2 = A1 best regards Fritz Birnbacher

2 2

[BGL, Graph] choose the correct container to handle graph with a property
by Johan Oudinet 21 Nov '05

21 Nov '05

Hello, I have a graph representing the Network topology and I want to replace it by a BGL graph. My problem is that I need to find a vertex by its IP address (an internal property), but I think we can only find a vertex with its vertex_descriptor. A solution is to maintain a map from IP address to vertex_descriptor. But removing a vertex with vecS for VertexList invalidates all vertex descriptors. Unfortunately, I need some efficiently to find a vertex, so listS seems not appropriated. Finally, I try to use setS for VertexList (and it works IMHO), but in the documentation: "The container must model Sequence or RandomAccessContainer." Hence, my questions are: - Can I use setS for VertexList ? And if I can't, why ? - Is there a better solution to find vertex by an internal property that handle an exterior map ? Cheers, -- Johan

2 2

Re: [Boost-users] Unknown program_options bomb
by Merrill Cornish 21 Nov '05

21 Nov '05

Volodya, Sorry about the formatting. It annoys me too. However, I'm using Earthlink's online Web Mail, so I'm stuck with some of their choices. There new mail (available RSN) may have a formatting option. RE: exception DOH! I should have thought of that. For everything else, I'm always very careful to check for exceptions. In this case, I tacitly assume it worked like getopts and just left unknown options on the command line. (Old habits die hard.) I haven't got time to try now, but I will put in the exception handlers and see what it's complaining about with my positional parameter. I realize that "bomb" wasn't very precise, but it was hard to describe what happened. First, Zone Alert would become excited and claim that my program was attempting to do something "dangerous". (Yes, that should have clued me in to an exception being thrown, but I was dense.) If I told Zone Alert to let it happen, then Windows popped up a dialog offering to send a report to Microsoft about my incompetence. :-) Thanks for your help. Merrill

1 0

boost::thread - mistake in documentation
by Oliver.Kowalke＠infineon.com 21 Nov '05

21 Nov '05

Hello, the documentation (http://www.boost.org/doc/html/condition.html) of class condition contains a mistake: instead of template<typename ScopedLock, typename Pred> bool timed_wait <http://www.boost.org/doc/html/condition.html> (ScopedLock&, Pred); it should be template<typename ScopedLock, typename Pred> bool timed_wait <http://www.boost.org/doc/html/condition.html> (ScopedLock&, const boost::xtime <http://www.boost.org/doc/html/xtime.html> & , Pred); so long, Oliver

1 0

contribution - sync. queue between producer/consumer threads
by Oliver.Kowalke＠infineon.com 21 Nov '05

21 Nov '05

Hello, I would contribute this code. The queue synchronizes the access between producer threads (putting items into the queue) and consumer threads (removing items from queue). I would be glad if you add this code to boost::thread library. With regards, Oliver <<queue.hpp>> <<test.cpp>>

1 0

Re: [Boost-users] Unknown program_options bomb
by Merrill Cornish 21 Nov '05

21 Nov '05

Will, I've changed my original po::store(parse_command_line(argc, argv, desc), vm); to po::store(po::command_line_parser(argc, argv). options(desc). positional(pd). run(), vm); where desc is is an options_description and pd is a positional_options_description. This looks like an exact match for po::variables_map vm; po::store(po::command_line_parser(ac, av). options(desc).positional(p).run(), vm); po::notify(vm); which is the example from http://www.boost.org/doc/html/program_options/tutorial.html. However, the code still bombs if I give it a positional parameter or an option it isn't expecting. Merrill

2 1

Re: [Boost-users] Unknown program_options bomb
by Merrill Cornish 21 Nov '05

21 Nov '05

Liam, I think you're right, but I haven't been able to figure out the exact incantation. :-) Merrill

1 0

Unknown program_options bomb
by Merrill Cornish 21 Nov '05

21 Nov '05

I am using Boost 1.33.0 with MinGW on Windows XP. I am using the following program_optins code to collect command line arguments: po::options_description desc("Options"); desc.add_options() ...[everyting defined in here works as advertised]... ;//add-options() // specify the single, required graph file positional parameter po::positional_options_description pd; pd.add("graph_file", 1); po::variables_map vm; po::store(parse_command_line(argc, argv, desc), vm); po::notify(vm); ... The above code is shamelessly lifted from the tutorial. Everything defined in desc.add_options() works including the "-h" alternative to "--help". However, two things fail. * vm.count("graph_file") returns 0 regardless of whether there are positional argument(s). * specifying an -x, --xx, --xx=n option where "x" or "xx" is not included in desc.add_options() causes store() to not return (the program simply stops). Am I missing something? Merrill

3 2

[wave] question about preprocessing hooks
by Alexey Bakhvalov 20 Nov '05

20 Nov '05

Hello, What is a correct way to implement 'defined_macro' hook? For some reason I always get empty 'definition' list. My hook implementation looks like this: class hook : public boost::wave::context_policies::default_preprocessing_hooks { public: template <typename TokenT, typename ParametersT, typename DefinitionT> void defined_macro(TokenT const &macro_name, bool is_functionlike, ParametersT const &parameters, DefinitionT const &definition, bool is_predefined) { if (!definition.empty()) { // never gets here } } }; I am using Boost 1.33 and VC .NET 2005 compiler. Alexey Bakhvalov

2 1

Re: [Boost-users] Wave library fails to compile with VC7.1 - Bufferoverrun in cl.exe
by Hartmut Kaiser 20 Nov '05

20 Nov '05

> Didier Malenfant wrote: > > > It seems like this was fixed by turning off the rtti for > > VC7.1 and I verified that both V1 and V2 jamfiles have the > workaround > > line in them (not sure which one is getting used as I'm not passing > > any parameters for that) > > V1 is used by default. Just another thought. Since you're using the 'vc-7_1-stlport' toolset, you'll need to add a <vc-7_1-stlport><*><rtti>off # workaround for compiler bug line to the Jamfiles. Could you please try this and report back? Regards Hartmut

1 0

Documentation Typo
by Merrill Cornish 20 Nov '05

20 Nov '05

FYI: The documentation page for the ptr_list<> class, http://www.boost.org/libs/ptr_container/doc/ptr_list.html, has a heading the says "Class ptr_vector". The headings are correct for ptr_vector<>, ptr_array<>, and ptr_deque. Merrill

2 1

Thread sheduling priority
by Leon Mergen 19 Nov '05

19 Nov '05

Hello, If been lookup up possible planned functonality for adjusting a thread's priority in the boost thread library. In my search, i found this email: http://aspn.activestate.com/ASPN/Mail/Message/boost/1690190 In that message, sent 2 years ago, William E. Kempf states that they are implemented but are still undergoing design changes. At the moment, I still don't see that functionality in the main boost library - is there any idea when this is going to be part of the main boost library ? Thanks in advance. -- Leon Mergen

1 0

[Iostreams] file_descriptor::seek() bug
by Takeshi Mouri 19 Nov '05

19 Nov '05

Hello, I try file_descriptor::seek() for a big file over 4GB on Win32, but the result was not correct. file_descriptor.cpp(185) > LONG lDistanceToMoveHigh = > off < 0xffffffff ? > static_cast<LONG>(off >> 32) : > 0; I think that lDistanceToMoveHigh always becomes 0. The condition above should be "off > 0xffffffff". Regards, Takeshi Mouri

2 1

build times
by gast128 19 Nov '05

19 Nov '05

Dear all, we use boost a lot in our code, but unfortunately this slows down the build times enormously. Although we use the precompiled header in Visual Studio, tracing the includes (with the /showincludes option), it seems that even relatively basic libraries (e.g. tuples, boost\utility.hpp, boost function and boost bind) end up in a massive include of mpl and type traits header files. So I begin to wonder if this wonderful template and preprocessor stuff is really such a good idea for those basic library. Besides that it doesn't improve the readability of the source, my guess is that it has a negative effect on short build times. Can a boost guru comment on this? Note that this is not a criticism, only an observation. I always like to write a boost bind construction, especailly with the == addition in 1.33. Wkr, me

14 91

[iostreams] Assertion in detail/optional.hpp, line 54
by Daniel Lidström 18 Nov '05

18 Nov '05

Hello! when compiled in debug mode, the following program causes an exception in the file p:\boost_1_33_0\include\boost-1_33\boost\iostreams\detail\ optional.hpp, line 54 (I'm using VC 7.1.3088, Windows XP): #include <iostream> #include <boost/iostreams/concepts.hpp> // sink #include <boost/iostreams/stream.hpp> // stream using namespace std; class IOutput { public: virtual void print(int, const char*) const = 0; }; class Output : public IOutput { public: void print(int id, const char* a) const { cout << a; } }; static IOutput* gpOutput; template<int id> class my_sink : public boost::iostreams::sink { public: std::streamsize write(const char* s, std::streamsize n) { gpOutput->print(id, s); std::streamsize sz = 0; for( const char* p=s; *p; ++p ) sz++; return sz; } }; typedef boost::iostreams::stream<my_sink<5> > output; int main() { gpOutput = new Output; output stream; stream << "Daniel" << endl; return 0; } When I compile in release mode the program prints `Daniel', just as expected. Is there a problem with my program? Thanks in advance! Hälsningar, Daniel

2 1

typo in Boost.Function docs
by Weston Markham 18 Nov '05

18 Nov '05

The following is from the documentation published at www.boost.org. Surely that "!" in the "throws" description should not be there, right? Weston functionN invocation result_type operator()(arg1_type a1, arg2_type a2, ... , argN_type aN) const; Effects: f(a1, a2, ..., aN), where f is the target of *this. Returns: if R is void, nothing is returned; otherwise, the return value of the call to f is returned. Throws: bad_function_call if !this->empty(). Otherwise, may through any exception thrown by the target function f.

2 1

calling on the template gods
by Doug Henry 18 Nov '05

18 Nov '05

I have been attempting to hide the boost interface when using the boost smart pointers. I basically want to get rid of boost declarations in my API's. This basically involves typedef-ing template classes, and the best solution I have been able to come up with is: template <typename T> struct pointer { typedef boost::scoped_ptr<T> obj; typedef boost::scoped_array<T> arr; typedef boost::shared_ptr<T> sobj; typedef boost::shared_array<T> sarr; }; so I can do things like pointer<int>::arr var(new int[10]). This works fine, but if I try to get tricky it falls apart. Another example: template <typename T> class Stuff { private: pointer<T>::arr some_stuff; }; This does not work (I can't even start to tell you why), but I have hit the point where I have to start second guessing my approach to this problem. Are there other (possibly terrible) tricks to get around the typedef templates problem? Any input will probably help. -thanks

5 4

auto_ptr w/ user specified deleter
by christopher baus 18 Nov '05

18 Nov '05

I'm messing around with the pool library and I was wondering if anybody has done any work on a version of auto_ptr with which allows a user specified deleter like scoped_ptr. Thanks, Christopher

1 0

[BGL,Graph] bundle and property maps
by Stephane Grabli 18 Nov '05

18 Nov '05

Hi, I'm (still) trying to use the strong components algorithm with a graph storing vertices as a list (listS). I've learned thanks to this mailing list that I had to explicitely declare and intialize a vertex_index map. The declaration of my graph type should therefore look like that: typedef adjacency_list<listS, listS, directedS,property<vertex_index_t,std::size_t> > Graph; and the component map should be declared this way: typedef graph_traits<Graph>::vertices_size_type v_size_t; //the range of ComponentMap vector_property_map< v_size_t, property_map<Graph, vertex_index_t>::type> componentMap(num_vertices(g), get(vertex_index,g) ); //g is an instance of Graph I would like to know if there is a way to combine this with the use of bundles. In practice, I used to have this declaration for my graph type: typedef adjacency_list<listS, listS, directedS,VertexBundle> Graph; with: struct VertexBundle{ int id; }; How should I merge these two types of declarations? Is there a way to define the required vertex_index as a bundle property and to use it to define my component map afterward? Thanks! Stephane PS: I apologize for the level of the questions, but I couldn't get a good understanding of all the property mechanisms out of the documentation.

3 2

[IOStreams] linking the iostreams libs with my own zlib.lib
by Christian Henning 17 Nov '05

17 Nov '05

Hi there, my project is using its own created zlib.lib, thats why I want to create the iostreams libs using our own zlib.lib . Creating the iostreams libs I use the following build command: bjam -sTOOLS=vc-7_1 --libdir=c:\boost\lib --with-iostreams "-sZLIB_BINARY=C:\CHH\External\Libraries\Release\zlib" "-sZLIB_INCLUDE=C:\CHH\External\Includes\zlib" "-sZLIB_LIBPATH=C:\CHH\External\Libraries\Release" --without-python stage Note that the ZLIB_SOURCE variable is missing. Otherwise the build would create it's own zlib library. Here is the warning I get when bjam is building the debug lib: LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library The problem arises because it's using a release built zlib.lib with the debug built iostream lib, since I can only pass one zlib to the build command. A solution would be to have two variables ZLIB_LIBPATH_DEBUG and ZLIB_LIBPATH_RELEASE. Which is the standard procedure. Or is there a variable in the boost build for creating debug lib only? Greets, Christian

2 4

matrix resize problem with version 1.31
by Ricardo Vázquez Martín 17 Nov '05

17 Nov '05

Hi all, I've been using the library in a computer with gcc 3.4.4 and boost 1.32 (in knoppix). I'm interested on uBLAS. The problem is that I need my code working in a different machine (robot) with gcc 3.4.1 in RH9. I've proved 1.30 (which generates a warning becouse gcc version is unknown) and 1.31 versions and there are problems when a matrix is resized. The values of the matrix are moved from their original positions. Also I have problems with zero_vector. Are there some difference between boost library versions? Could I do something to fix that problem?. Do I need to install gcc 3.4.4?. I've seen that gcc 3.4.4 is tested for uBLAS. Thanks in advance, -- Ricardo Vázquez Martín <rvmartin(a)uma.es> Departamento de Tecnología Electrónica Telf.: +34 952 13 2845/7222 E.T.S. Ing. de Telecomunicación FAX: +34 952 13 1447 Universidad de Málaga Campus de Teatinos 29071 Málaga - Spain

1 0

Trouble building bjam
by Andrew Mellinger 17 Nov '05

17 Nov '05

Everyone, I apologize if this isn't the right forum for bjam issues, but I can't find a group specifically for bjam. If someone knows of one, please direct me that way. I have tried searching google, but haven't identified anything relevant. I am trying to build bjam on SunOS 5.8 using gcc 3.1 with the posix thread model. When I do a gcc-v I also get: Configured with: ../configure --with-as=/usr/ccs/bin/as --with-ld=/usr/ccs/bin/ld --disable-nls I don't know if any of that is relevant. When I run ./build.sh from the jam_src directory (either in boost source tree or a download of 3.1.11) I get the following output. ### ### Using 'gcc' toolset. ### rm -rf bootstrap mkdir bootstrap gcc -o bootstrap/jam0 command.c compile.c execnt.c execunix.c execvms.c expand.c filent.c fileos2.c fileunix.c filevms.c glob.c hash.c hdrmacro.c headers.c jam.c jambase.c jamgram.c lists.c make.c make1.c newstr.c option.c parse.c pathunix.c pathvms.c regexp.c rules.c scan.c search.c subst.c timestamp.c variable.c modules.c strings.c filesys.c builtins.c pwd.c class.c native.c modules/set.c modules/path.c modules/regex.c modules/property-set.c modules/sequence.c modules/order.c ./bootstrap/jam0 -f build.jam --toolset=gcc --toolset-root= clean ...found 1 target... ...updating 1 target... ...updated 1 target... ./bootstrap/jam0 -f build.jam --toolset=gcc --toolset-root= don't know how to make command.c don't know how to make compile.c don't know how to make expand.c don't know how to make glob.c don't know how to make hash.c don't know how to make hcache.c don't know how to make headers.c don't know how to make hdrmacro.c don't know how to make jam.c don't know how to make jambase.c don't know how to make jamgram.c don't know how to make lists.c don't know how to make make.c don't know how to make make1.c don't know how to make newstr.c don't know how to make option.c don't know how to make parse.c don't know how to make regexp.c don't know how to make rules.c don't know how to make scan.c don't know how to make search.c don't know how to make subst.c don't know how to make timestamp.c don't know how to make variable.c don't know how to make modules.c don't know how to make strings.c don't know how to make filesys.c don't know how to make builtins.c don't know how to make pwd.c don't know how to make class.c don't know how to make native.c don't know how to make modules/set.c don't know how to make modules/path.c don't know how to make modules/regex.c don't know how to make modules/property-set.c don't know how to make modules/sequence.c don't know how to make modules/order.c don't know how to make execunix.c don't know how to make fileunix.c don't know how to make pathunix.c ...found 43 targets... ...updating 1 target... ...can't find 40 targets... ...can't make 1 target... [MKDIR] bin.solarisx86 ...skipped bjam for lack of command.c... ...skipped 1 target... ...updated 1 target... So for some reason jam0 can't identify the source files. I'm not sure why, I have very little experience with the bjam boostrap process. Does anyone have any hints or can they point me to some other resources? Thanks for your time, -Andrew

1 1

[BGL, Graph] listS and property maps
by Stephane Grabli 17 Nov '05

17 Nov '05

Hi, I'm new to the BGL and I'm trying to use the strong_components algorithm, defined this way: template <class Graph, class ComponentMap, class P, class T, class R> typename property_traits<ComponentMap>::value_type strong_components(Graph& g, ComponentMap comp, const bgl_named_params<P, T, R>& params = all defaults) with a graph defined like this: typedef adjacency_list<listS,listS,directedS> Graph; (in particular using listS for vertices storage). Does anyone know how I should declare the ComponentMap property map? I couldn't figure this out from the documentation and the examples I've seen all assume that a vecS type storage is used for vertices in the graph. Thanks! Stephane

4 6

CVS silence:)
by Serge Skorokhodov 17 Nov '05

17 Nov '05

Hi, boost CVS has not changed for a few days. Should cvs update arguments be modified? TIA -- Serge

2 2

[serialization] template point
by codeur＠altern.org 17 Nov '05

17 Nov '05

Hello I'm a new user of the serialization library and I didn't understand how I could serialize the following Map class : #include <vector> template<typename T> class Point { private: T x; T y; }; template<typename T> class Map { private: std::vector < Point<T> * > map; }; int main() { Map<double> m; /* double or float or int or user defined float/integer with infinite precision */ return 0; } Could somebody help me ? Thanks!

1 0

[iostreams] WinRar cannot read zlib archive
by Christian Henning 16 Nov '05

16 Nov '05

Hi there I just have a simple question regarding the format of a zlib archive. Somehow WinRar cannot read the archive. If I use the simple example application provided in the zlib distribution WinRar is able to read it. This makes me wondering what difference is in the archive generated by boost::iostreams? Here is my example code which works fine. I using VC7.1 and Boost 1.33 #include <iostream> #define BOOST_IOSTREAMS_NO_LIB #include <boost/iostreams/device/file.hpp> #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/filter/zlib.hpp> namespace io = boost::iostreams; int _tmain(int argc, _TCHAR* argv[]) { { io::filtering_ostream out; out.push( io::zlib_compressor() ); out.push( io::file_sink( "hello.zip" )); out << "Hello boost::iostreams"; //close the file } io::filtering_istream in; in.push( io::zlib_decompressor() ); in.push( io::file_source( "hello.zip" )); std::string strMessage; std::getline( in, strMessage ); std::cout << strMessage << std::endl; return 0; } Besides the problem, seems that boost::iostream is an amazing lib and a huge contribution for the C++ community. Thanks, Christian

2 5

[MPL] how do i validate a predicate template?
by Cory Nelson 16 Nov '05

16 Nov '05

Is there any way to validate a predicate (function, functor etc) template with MPL? ie, something like: BOOST_MPL_ASSERT((and_< is_function<Predicate>, equal_to<function_traits<Predicate>::arity, int_<1> >, is_same<function_traits<Predicate>::result_type, int >, is_same<function_traits<Predicate>::arg1_type, int > >)); -- Cory Nelson http://www.int64.org

2 1

Re: [Boost-users] Inheritance
by james.jones＠firstinvestors.com 16 Nov '05

16 Nov '05

Hi Azam, Are you sure you want to inherit? Might it make sense to make a Boost graph object a private variable which you construct and then modify in your constructor? - James Jones Administrative Data Mgmt. (v)732-510-1806 375 Raritan Center Pkwy, Suite A (f)732-510-1855 Edison, NJ 08837 Visit us on the web at http://www.firstinvestors.com/ --- Original Message --- Date: Tue, 15 Nov 2005 18:53:15 -0800 From: "azam ." <boost80(a)gmail.com> Subject: [Boost-users] Inheritance To: boost-users(a)lists.boost.org Message-ID: <825e260c0511151853q4b0d599ek5a0d6d3daa28dec3(a)mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" Hi, I want to use Boost Graph Library via inheritance. Actually I want to define a graph which is an adjacency_list graph and is created in a special way. I thought of making it a derived class of adjacency_list and then define constructors to construct objects of this class. But my problem is how to (for example) set vertex properties in the constructor? Regularly if I want to add properties to vertices on a graph g, I use vertices(g) to get iterator of vertices and then I use this iterator, but what can I do in the constructor? I have no such graph object there and I can't use "this" reference too. Any help would be really appreciated. Thanks Azam

1 0

Collections of shared_ptr<Base> and shared_ptr<Derived>
by Keith Weintraub 16 Nov '05

16 Nov '05

Folks, What is the best way to pass a std::vector<boost::shared_ptr<Derived> > to a function that expects a std::vector<boost::shared_ptr<Base> >? Can I use a cast or should I create a new std::vector<boost::shared_ptr<Base> > by iterating over the std::vector<boost::shared_ptr<Derived> >? Here is some sample code. What f is doing is not important it is just an example: class A { // This class is from a library I have no control over. public: virtual string getName() { return string("A");} }; class B : public A { // I need to create B from A to have extra functionality public: virtual string getName() { return string("B");} virtual string getLongName() { return string("This is B");} }; void f(std::vector<boost::shared_ptr<A> > &v) { // This function is from a library that I have no control over. for(int i = 0; i < v.size(); i++) cout << v[i]->getName(); } int main(char *argv, int arc) { std::vector<boost::shared_ptr > bvec(10); boost::shared_ptr bPtr(new B); bvec[0] = bPtr; f(bvec); // This should not compile. <------------------------- } The last line (with the arrow) won't compile because std::vector<boost::shared_ptr > cannot be converted to std::vector<boost::shared_ptr<A> >.

1 0

Boost.Iostreams - Filtering Stream questions (flushing, interactive input)
by Michael Rickert 16 Nov '05

16 Nov '05

I've been trying to use Boost.Iostreams, with mixed success. I've got a few more stumbling blocks that hopefully I can get some help with :-). First, I have a socket class, which I've used Boost.Iostreams to create a nice interface for. Quick details: class winsock_device { typedef boost::iostreams::bidirectional_device_tag category; //..implementation.. }; class winsock_socket { typedef winsock_device stream_device_type; typedef boost::iostreams::stream_buffer< stream_device_type > stream_buffer_type; typedef std::iostream stream_type; stream_device_type m_stream_device; stream_buffer_type m_stream_buffer; stream_type m_stream; public: winsock_socket( SOCKET raw_socket ) : m_stream_device( raw_socket ) , m_stream_buffer( m_stream_device ) , m_stream( & m_stream_buffer ) {} stream_type & stream() { return m_stream; } //..more implementation.. }; The implementation seems to work, tests show it to be working fine for input and output (with output needing to be flushed). Only problem is that the newlines are mismatched - a simple telnet chat client gets supurflous \r characters using std::getline, so I decided to wrap around the stream using a boost::iostreams::filtering_stream< boost::iostreams::bidirectional >, which is where things fall apart. I took my simple example, and replaced: std::iostream & ios = socket->stream(); with: namespace bios = boost::iostreams; bios::filtering_stream< bios::bidirectional > ios; ios.push( socket->stream() ); both with the same testing code: std::string nickname; ios << "Welcome, user - please enter a nickname:\n" << std::flush; socket->stream().flush(); std::getline( ios , nickname ); ios << "Welcome, " << nickname << "\n"; ios << "*** actual chatting not yet implemented ***\n"; ios << "Disconnecting you now, bye " << nickname << " !!!\n" << std::flush; socket->stream().flush(); This failed to work at all at first, eventually I figured out I needed to flush first the ios stream, and then the underlying socket->stream. This brings me to: question 1: Is there a workaround to allow an ending stream of (std::iostream &) to be flushed automatically by flushing filtering_stream? Even with no filters installed, however, the program freezes (until I shut down the telnet client) when I attempt to read a line from the stream, even after entering multiple newlines - I'm not exactly sure what's happening here. This brings me to: question 2: How can I get the input moving through my stream? Do I need to start a seperate thread to constantly flush() the stream that the main thread is blocked on i/o for? Thanks, -Mike

1 0

Inheritance
by azam . 16 Nov '05

16 Nov '05

Hi, I want to use Boost Graph Library via inheritance. Actually I want to define a graph which is an adjacency_list graph and is created in a special way. I thought of making it a derived class of adjacency_list and then define constructors to construct objects of this class. But my problem is how to (for example) set vertex properties in the constructor? Regularly if I want to add properties to vertices on a graph g, I use vertices(g) to get iterator of vertices and then I use this iterator, but what can I do in the constructor? I have no such graph object there and I can't use "this" reference too. Any help would be really appreciated. Thanks Azam

1 0

[IOStreams] Memory leaks when using zlib_compressor
by Christian Henning 16 Nov '05

16 Nov '05

Hi there, I couldn't find anything in the archives for my problem. Purify is showing several memory leaks when I execute the following program: int _tmain(int argc, _TCHAR* argv[]) { // prepare some data to write unsigned int nSize = 1000000; char* pBits = new char[nSize]; ::memset( pBits , 0 , nSize ); for( unsigned int i = 0; i < nSize; i++ ) { pBits[i] = i; } // write to file io::filtering_ostream out; out.push( io::zlib_compressor() ); out.push( io::file_sink( "test.zip", std::ios::binary )); out << nSize; out.write( pBits , nSize ); // clean up delete[] pBits; return 0; } I think the program is right. I'm using Boost 1.33 with VC 7.1. Here is what purify spits out: [I] Summary of all memory leaks... {268108 bytes, 6 blocks} [I] MPK: Potential memory leak of 196608 bytes from 3 blocks allocated in boost::iostreams::detail::zlib_base::do_init(zlib_params::iostreams::boost const&,bool,(*)(void *,UINT,UINT),(*)(void *,void *),void *) [IOStreams.exe] [W] MLK: Memory leak of 71360 bytes from 2 blocks allocated in boost::iostreams::detail::zlib_base::do_init(zlib_params::iostreams::boost const&,bool,(*)(void *,UINT,UINT),(*)(void *,void *),void *) [IOStreams.exe] Is that a know issue? I guess so, but has it been resolved? Thanks, Christian

2 3

Too many library variants
by Merrill Cornish 15 Nov '05

15 Nov '05

When I built Boost 1.33.0 for MinGW, I just specified the toolset. As a result I got 28! variants on the set of Boost libraries. >From the various file names, I can figure out most of the variants: d = debug mt = multi-threaded s = static but there are other variants which aren't as obvious. For example, what's the distinction among boost-<libname>-mgw-1_33.dll boost-<libname>-mgw-1_33.lib boost-<libname>-mgw.lib The two .lib files have the same sizes and timestamps, so they appear to be the same file with and without the Boost version in the name. Is the idea that if you use the library WITHOUT the version number suffix, then you can upgrade to a new version without having to modify your make file? OK, what's the distinction between the .dll and .lib? I understand that they linker needs one set of information about library function names and entry points while the actual function bodies are needed at run time. However, I thought all of that information is in the .dll file. On the other hand, the .dll version is so much bigger than the .lib that there must be more than an entry point table involved. Then there are the libboost-* variations... I understand that in the Unix world, the -L linker option specifies the library directory while the -l<name> option tells the Unix linker to look for the lib<name>.a file. OK, but how does that work with MinGW's ld.exe linker on Windows. Some of the libraries are available only in the static version, but the only static libraries are the libboost-* variants. There is a statement somewhere in the Boost library documention that the selection of libraries should be automatic in Windows because of pragma's in the libraries. However, I haven't been able to find where MinGW supports that pragma. Merrill

4 4

split() differences between 1.32.0 and 1.33.0
by Dave Dribin 15 Nov '05

15 Nov '05

Hello, I recently upgrade from Boost 1.32.0 to 1.33.0, since I just upgraded to Mac OS X 10.4 from 10.3. I noticed a slightly different behavior in boost::algorithm::split between these two versions. If you have a trailing delimiter, like: vector<string> results; ba::split(results, ",foo,", ba::is_any_of(",")); This returns 2 elements in 1.32.0 and 3 elements in 1.33.0. Was this changed intentionally? It does seem to make more sense to return 3 elements, but it currently breaks my program. -Dave

3 3

[Review] Boost.Logging review result
by Hartmut Kaiser 15 Nov '05

15 Nov '05

Hi all, today I got the following message from John Torjo: <quote> Due to the feedback I got, I would like you to declare the library as rejected. In the light of what Gennady and others have said, indeed, another interface would be best suited for the Boost Log library. With what I know now, I would like to redesign the library from ground up, and ask for another review, probably 6 months from now or so. </quote> In the light of this announcement the review of the proposed Boost.Logging library submitted by John is closed. The library is not included into Boost. I very much hope John will find the time and energy to redesign and resubmit the library in the future. Regards Hartmut Review Manager

1 0

[Boost][Serialization] reset_object_address in 1.33.1 beta?
by Topi Mäenpää 15 Nov '05

15 Nov '05

Hi, reset_object_address is no more a member of polymorphic_iarchive in 1.33.1 beta. Why not? -- Topi Mäenpää CTO, Intopii +358 40 774 7749

2 1

Re: [Boost-users] Too many library variants
by Merrill Cornish 15 Nov '05

15 Nov '05

Jeff, Thanks for mentioning that. I am a bit weird in that I *do* RTFM. While the Boost documentation has a very professional look, I have found in a number of different libraries that the information seems disjoint. It is often difficult to figure out how to do any one thing without reading and comparing a bunch of different pages. For example, you build Boost with bjam, but try to find one listing of what the command line arguments are to bjam. Merrill

1 0

Unit Test problem with wstrings
by Sean Rohead 15 Nov '05

15 Nov '05

I am using the Boost Unit Test library and have code that uses the BOOST_CHECK_EQUAL macro with std::wstring instances. I get a compilation error when I do this because there is no operator<< defined for a narrow ostream and a wide string. So, I created one as shown below, but I am still getting the exact same compilation error (using MSVC 2003). With my new operators, I am able to manually insert wide strings into a narrow ostream, but the BOOST_CHECK_EQUAL macro expansion still doesn't seem to be picking it up. Any ideas? Thanks, Sean Rohead <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< #include <string> #include <iostream> std::wstring widen(const std::string& source) { std::wstring result(source.size(), wchar_t(0)); typedef std::ctype<wchar_t> ctype_t; const ctype_t& ct = std::use_facet<ctype_t>(std::locale()); ct.widen(source.data(), source.data() + source.size(), &(*result.begin())); return result; } std::string narrow(std::wstring source) { std::string result(source.size(), char(0)); typedef std::ctype<wchar_t> ctype_t; const ctype_t& ct = std::use_facet<ctype_t>(std::locale()); ct.narrow(source.data(), source.data() + source.size(), '\u00B6', &(*result.begin())); return result; } std::ostream& operator<<(std::ostream& out, const std::wstring& value) { out << narrow(value); return out; } std::wostream& operator<<(std::wostream& out, const std::string& value) { out << widen(value); return out; } #include <boost/test/unit_test.hpp> void main() { std::string message("message"); std::wstring wmessage(L"MESSAGE"); // THESE TWO LINES COMPILE AND WORK FINE std::wcout << message << std::endl; std::cout << wmessage << std::endl; // THIS LINE STILL DOES NOT COMPILE BOOST_CHECK_EQUAL(wmessage, std::wstring(L"message")); } >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ------ Build started: Project: boost, Configuration: Debug Win32 ------ Compiling... main.cpp c:\lib\boost_1_32_0\boost\test\test_tools.hpp(207) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'const std::wstring' (or there is no acceptable conversion) c:\lib\boost_1_32_0\boost\test\test_tools.hpp(206) : while compiling class-template member function 'void boost::test_tools::tt_detail::print_log_value<T>::operator ()(std::ostream &,const T &)' with [ T=std::wstring ] c:\lib\boost_1_32_0\boost\test\test_tools.hpp(251) : see reference to class template instantiation 'boost::test_tools::tt_detail::print_log_value<T>' being compiled with [ T=std::wstring ] c:\lib\boost_1_32_0\boost\test\detail\wrap_stringstream.hpp(69) : see reference to function template instantiation 'std::ostream &boost::test_tools::tt_detail::operator <<<Left>(std::ostream &,const boost::test_tools::tt_detail::print_helper<T> &)' being compiled with [ Left=std::wstring, T=std::wstring ] c:\lib\boost_1_32_0\boost\test\test_tools.hpp(438) : see reference to function template instantiation 'boost::basic_wrap_stringstream<CharT> &boost::operator <<<char,boost::test_tools::tt_detail::print_helper<T>>(boost::basic_wrap _stringstream<CharT> &,const boost::test_tools::tt_detail::print_helper<T> &)' being compiled with [ CharT=char, T=std::wstring ] c:\Documents and Settings\sean.rohead\My Documents\Visual Studio Projects\boost\main.cpp(43) : see reference to function template instantiation 'bool boost::test_tools::tt_detail::equal_and_continue_impl<std::wstring,std:: basic_string<_Elem,_Traits,_Ax>>(const Left &,const Right &,boost::wrap_stringstream &,boost::test_tools::const_string,size_t,boost::unit_test::log_level,siz e_t)' being compiled with [ _Elem=wchar_t, _Traits=std::char_traits<wchar_t>, _Ax=std::allocator<wchar_t>, Left=std::wstring, Right=std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator <wchar_t>> ] Build log was saved at "file://c:\Documents and Settings\sean.rohead\My Documents\Visual Studio Projects\boost\Debug\BuildLog.htm" boost - 1 error(s), 0 warning(s) ---------------------- Done ---------------------- Build: 0 succeeded, 1 failed, 0 skipped

3 3

Boost and fastcall
by Marcus Krantz 15 Nov '05

15 Nov '05

Hi. I'm trying to integrate two applications. The first is configured to use fastcall and the other is using cdecl... The thing is that I get linking errors which says that boost uses thiscall? eh. However, i can change the other application to use fastcall too, but when i try to link the integrated application it says as i mentioned earlier that boost uses thiscall. Can i configure boost to use whatever I want? regards Marcus

2 1

[serialization] About NaNs
by Topi Mäenpää 15 Nov '05

15 Nov '05

Robert, The std::numeric_limits class template has functions for this. I have used the following definition in my code: #ifndef NAN /** * Double-precision not-a-number. Some systems don't have the * C99-standard macro @p NAN defined. GNU gcc does as an extension, * but MSVC doesn't. */ # define NAN std::numeric_limits<double>::quiet_NaN() #endif I don't think serializing signaling NaNs makes any sense, so I suggest using the quiet version. The difference is that computing anything with quiet NaN produces a quiet NaN, whereas signaling NaN raises a FP exception. Furthermore, the result of computation with sNaN is not very well defined. I'd like to add one to your count of NaN users. I'm using it in many occasions, typically indicating an "undefined" or "not applicable" situation. Due to the aforementioned property, it is easy to track back calculation errors if undefined values are involved. (Just find the first non-NaN intermediate result.) Saving "I haven't yet defined the value of this formula" with a NaN makes sense to me. BR, Topi On Sun, 2005-11-13 at 16:02 -0800, Robert Ramey wrote: > Truth is, I don't even know how one goes about assigning a NaN or a > +/inf to floating/double variable !! > > Robert Ramey -- Topi Mäenpää CTO, Intopii +358 40 774 7749

1 0

[filesystem]Sorting based on equivalence information?
by Rush Manbert 14 Nov '05

14 Nov '05

Hi all, I have written a class around the glob_iterator class that W. Richard Johnson put into the file vault last year. My class finds all the paths and/or files matching a multi-level wildcard pattern. (i.e. the matching expressions may appear in more than one place, such as "/Users/*/MySource/??foo/*.cpp") I need to detect loops caused by links between directories, and I also want to detect multiple paths to the same file, and only keep one of them. The only method that I have come up with so far is to keep the paths that I have found in a collection and test each new path against all of them by calling equivalent() once for each collection member. Needless to say, this is a little slow when the number of files or directories becomes large. It could be faster if I only tested symlinks, but I think that the existence of hard links forces me to test everything. My first question: Can anyone suggest a better method of achieving the duplicates detection? My second question (This is probably directed at Beman Dawes): I read the code for equivalent(), and it seems like I could derive a class from path that would implement operator< in such a way that it sorted by the equivalence information, rather than by the path string. If I could sort the paths by their equivalence information, then I could binary search the collection when I look for duplicates. I would have to copy the code in equivalent(), which is an ugly thing to do, and I guess I would need to define all of the operators that are defined in path, since they are not virtual. Assuming that I did these things, though, does this sound like it's even valid? From the comments that I read in the equivalent() source, it seems that the file equivalence information can change, at least on a windows system. I guess I could create a handle_wrapper for each path that I add to the collection in order to keep the file from being moved while it's in the collection. Of course, I can't be the first person who has gone down this path, or the library would probably already support this sort of sorting. Is this just a stupid idea? Thanks, Rush

3 4

problem using stream class when calling read function
by Hendra Hidayat 14 Nov '05

14 Nov '05

Hi, I have a problem when using stream class from iostreams library. I have created a device class say GDevice using iostreams::device_tag and iostreams::input_seekable tag. In GDevice I 've declared and implemented read function inside GDevice class. I also create a stream class let's say GStream which derived from iostreams::stream<GDevice>. The problem was occured when I created object from GStream and call GStream's read function directly to read say n bytes data. The GStream's read function invoked GDevice's read function not in n bytes data but always in 4096 bits. I dont understand where this number came from. I'm using boost 1.33, gcc compiler version 4.0.2 under x86-64 bit suse linux. Can somebody help me? Faithfully yours Hendra Hidayat Geophysical Lab. Natural Physics Dept. Sepuluh Nopember Institute of Tech. __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com

1 0

DateTime parsing question
by Sean Rohead 14 Nov '05

14 Nov '05

I am trying to parse ISO datetime strings with millisecond resolution and the fractional seconds are being truncated. Am I doing something wrong in the following code? Thanks, Sean Rohead >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> #include <string> #include "boost/date_time/posix_time/posix_time.hpp" using namespace std; using namespace boost::posix_time; void main() { string dateString1 = "20051004T151801"; string dateString2 = "20051004T151801.123"; ptime timestamp1(from_iso_string(dateString1)); ptime timestamp2(from_iso_string(dateString2)); cout << timestamp1 << endl; cout << timestamp2 << endl; }

3 3

Re: [Boost-users] [serialization]
by Kevin Carroll 14 Nov '05

14 Nov '05

> On Sun, 2005-11-13 at 16:02 -0800, Robert Ramey wrote: > > > Truth is, I don't even know how one goes about assigning a NaN or a > +/inf to floating/double variable !! Not an expert here like you guys, but how about: #include <limits> double x_NaN = std::numeric_limits<double>::quiet_NaN(); double y_PlusInfinity = std::numeric_limits<double>::infinity(); double z_MinusInfinity = -std::numeric_limits<double>::infinity(); ... Also, here is some concise info on IEEE standard floating point numbers available from the Internet: The following notes are reproduced from http://stevehollasch.com/cgindex/coding/ieeefloat.html Infinity The values +infinity and -infinity are denoted with an exponent of all 1s and a fraction of all 0s. The sign bit distinguishes between negative infinity and positive infinity. Being able to denote infinity as a specific value is useful because it allows operations to continue past overflow situations. Operations with infinite values are well defined in IEEE floating point. Not A Number The value NaN (Not a Number) is used to represent a value that does not represent a real number. NaN's are represented by a bit pattern with an exponent of all 1s and a non-zero fraction. There are two categories of NaN: QNaN (Quiet NaN) and SNaN (Signalling NaN). A QNaN is a NaN with the most significant fraction bit set. QNaN's propagate freely through most arithmetic operations. These values pop out of an operation when the result is not mathematically defined. An SNaN is a NaN with the most significant fraction bit clear. It is used to signal an exception when used in operations. SNaN's can be handy to assign to uninitialized variables to trap premature usage. Semantically, QNaN's denote indeterminate operations, while SNaN's denote invalid operations. The definition of NaNs, signed zero and infinity, and denormalized numbers from "IEEE Standard for Binary Floating-Point Arithmetic", ANSI/IEEE Standard 754-1985, Institute of Electrical and Electronics Engineers, August 1985., is reproduced below. In the following, 'S' stands for the sign bit, 'E' for the exponent, and 'F' for the fractional part. The symbol 'u' stands for an undefined bit (0 or 1). Type S (1 bit) E (11 bits) F (52 bits) signaling NaN u 2047 (max) .0uuuuu---u (with at least one 1 bit) quiet NaN u 2047 (max) .1uuuuu---u negative infinity 1 2047 (max) .000000---0 positive infinity 0 2047 (max) .000000---0 negative zero 1 0 .000000---0 positive zero 0 0 .000000---0 Kevin Carroll

1 0

Boost.MultiArray + iterators
by Dennis Zickefoose 14 Nov '05

14 Nov '05

I have a simple two dimensional multi_array that I am trying to copy a row out of. This works, but I get a warning about a type conversion that I would like to get rid of. Example: boost::multi_array<double, 2> array(boost::extents[42][42]); std::vector<double> row(array[0].begin(), array[0].end()); This produces the following warning in VC++ 7.1: c:\Boost\include\boost-1_33\boost\multi_array\iterator.hpp(149) : warning C4244: '+=' : conversion from 'boost::detail::multi_array::array_iterator<T,TPtr,NumDims,Reference>::difference_type' to 'boost::detail::multi_array::array_iterator<T,TPtr,NumDims,Reference>::index', possible loss of data This is followed by a long string of support messages that ultimately point to the vector initialization. Yet the vector is successfully initialized with the range of values I expect. So what am I doing wrong here? I understand that [array.begin(), array.end()) is actually a range of sub-views, rather than a range of values...is this a side effect of this distinction? At the moment, I have replaced that with &array[0][0] to avoid the warning, but if possible I would like to go with the more reliable iterator interface in the future. Any suggestions/advice would be greatly appreciated. DZJr

2 3

Desperately in need of help!
by Marcus Krantz 14 Nov '05

14 Nov '05

Hi all! I have an application which uses STLport 5.0.0, libtorrent (which in turn uses Boost). What I have done is that I have compiled the boost libraries for msvc7.1-stlport. I only uses three, i.e. filesystem, date_time and thread. My boost version is 1.33.1 So the problem occurs when my application is linking. Then I get a lot of LNK2005 link errors. I have no problems with compiling my code and use the boost libraries it's only when I'm about to link it fails. The errors says, in general, that a lot of things already are defined in libboost_xxx_mt-sp... I guess that if I post some of my errors it will be easier for those who wants to help me :) So here we go... 1. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::operator+=(char const *)" (??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV01@PBD@Z) already defined in libboost_filesystem-vc71-mt-sp-1_33_1.lib(path_posix_windows.obj) 2. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > & __thiscall std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> >::erase(unsigned int,unsigned int)" (?erase@?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@QAEAAV12@II@Z) already defined in libboost_date_time-vc71-mt-sp-1_33_1.lib(greg_month.obj) 3. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: char __thiscall std::basic_ios<char,struct std::char_traits<char> >::widen(char)const " (?widen@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEDD@Z) already defined in libboost_thread-vc71-mt-sp-1_33_1.lib(once.obj) 4. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: class std::basic_ostream<char,struct std::char_traits<char> > * __thiscall std::basic_ios<char,struct std::char_traits<char> >::tie(void)const " (?tie@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEPAV?$basic_ostream@DU?$char_traits@D@std@@@2@XZ) already defined in libboost_thread-vc71-mt-sp-1_33_1.lib(once.obj) I would really appreciate if anyone could help me out here. Since I am new to C++ etc. I have major difficulties in intepreting the error messages. Best regards Marcus Krantz

2 1

vc-8_0-stlport
by Slava Tutushkin 14 Nov '05

14 Nov '05

Does anybody know if there are any plans about adding toolset support for Visual Studio 2005 with STLPort? In fact, I tryed to compile Boost 1.33.1beta using vc-8_0 toolset, but with STLPort installed. It was almost succeed not counting incorrect libraries naming (without -p- suffix in filenames). Slava Tutushkin mailto:aloner@aloner.ru

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Example error for boost::numeric_cast
by Daniel Krügler 14 Nov '05

14 Nov '05

Hello! The example for boost::numeric_cast contains documentation, which clearly is wrong and stumbles the reader. On http://boost.org/libs/numeric/conversion/doc/numeric_cast.html#numeric_cast we have the lines unsigned long l=std::numeric_limits<unsigned long>::max(); // This works, because unsigned integral types cannot cause overflow. unsigned char c=numeric_cast<unsigned char>(l); which contradict the behaviour and the range checking logic presented on http://boost.org/libs/numeric/conversion/doc/converter.html#rchklogic Btw.: Further on the #include directive, namely #include <boost/numeric_cast.hpp> should be corrected to #include <boost/numeric/conversion/cast.hpp> Greetings from Bremen, Daniel Krügler

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intrusive_ptr feature request for constructor
by Bruno Martínez 13 Nov '05

13 Nov '05

Hi. intrusive_ptr's constructor takes an bool to signal whether the refcount should be initially incremented or not. The default is true. I find that the default is different for different types, so I propose to add a hook to specify the policy for each type. At first I thought to do this with traits, but now I think a function is better because this doesn't need to be compile-time and a function overload works fine with ADL. I'm no expert in this, so maybe I'm mistaken somewhere. What I propose is to add: namespace boost { template <class T> bool intrusive_ptr_add_ref_at_construction(T*) { return true; } template<class T> class intrusive_ptr { intrusive_ptr(T * p, bool add_ref = intrusive_ptr_add_ref_at_construction((T*)0)): p_(p) { if(p_ != 0 && add_ref) intrusive_ptr_add_ref(p_); } ... } } then I can do bool intrusive_ptr_add_ref_at_construction(MyType*) { return false; } What do you think of this feature? Regards, Bruno

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Documentation question. Format and lexical_cast
by Drumheller, Michael 13 Nov '05

13 Nov '05

There seems to be some considerable overlaps in functionality between boost::lexical_cast and boost::format, yet, as far as I can tell, the documentation pages for each does not mention the other. Is this intentional, or would anyone agree that a doc fix would be in order? (Needless to say, if so, I would be happy to help with it.) Thanks, Michael D.

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Boost.Serialization vs STL containers of 'double'
by Adam M 12 Nov '05

12 Nov '05

Hi, I am using Boost.Serialization to serialize a std::map<std::string, double>. It works fine, except that the precision on the double is not enough for my application. Is it possible to manipulate the precision used when serializing/deserializing double's within an STL container? I tried using setprecision(), but it doesn't understand the "&" stream operator that the Serialization library uses. Thanks, Adam

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