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how to know when eof has been reached?
by eial＠cs.bgu.ac.il 12 Feb '10

12 Feb '10

hello I've implemented a base64 decoder using input_filter, now for some reason I can't seem to cause it to end when reaching EOF. I need to read the entire that but using >> returns what is in between spaces, so I've created a function that loops on the stream to get the data. using a bool flag haven't worked because for some reason, the value isn't saved between the functions so I've tried with a specific char, that didn't worked too, how can I know when I've reached EOF? the headers and source can be found at: http://gitorious.org/open-source-soccer-manager/ossm/blobs/master/src/Utili… http://gitorious.org/open-source-soccer-manager/ossm/blobs/master/src/Utili… thanks.

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[boost-build] error: Unable to find file or target named '/qt//QtGui'
by Tim Odenthal 11 Feb '10

11 Feb '10

Hi! After successfully compiling our project dozens of times, I suddenly get the error: Unable to find file or target named '/qt//QtGui'. I have absolutely no clue to what I could possibly have changed; I reverted our whole jamtree to the date before the last successful compilation... The jamfile in which the error is thrown looks something like this: import qt4 ; lib foo : $(SOURCE_ROOT)/bar.cpp (and many more...) /qt//QtGui /q//QtXml /qt//QtCore /qt//QtOpenGL : ; install install_foo : foo : <variant>release:<location>$(INSTALL_ROOT) <variant>debug:<location>$(INSTALL_ROOT)/debug ; I thought that the build tools of bjam then find the appropriate stuff and build it according to /usr/local/boost_1_42_0/tools/build/v2/tools/qt.jam which I obviously didn't change at all. I get the same error both with boost version 1_40_0 and 1_42_0. The stuff not dependent on qt seems to work fine... I'm working on a Kubuntu 9.10 box with gcc 4.4.1 - and as far as I can see (the history of my package manager admits), there was no change to the qt libs of Kubuntu during the time in question - but maybe the history of this package manager is not so reliable (I checked again that all the -dev packages are installed as well). Has anybody an idea what could have gone wrong? Is there another way to specify that bjam should include, compile and link these libraries? Thanks in advance Tim

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Seeding boost::mt19937 with bytes from CryptoGenRandom
by e m 11 Feb '10

11 Feb '10

I have a C++ program that uses /dev/urandom on Unix systems to seed boost::mt19937. I'm porting the program to Windows. I can get good, random seed data on Windows similar to random seed data produced from /dev/urandom on Unix systems like so: HCRYPTPROV hProvider = 0; BYTE randomBytes[8]; CryptAcquireContext(&hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT); CryptGenRandom(hProvider, sizeof(randomBytes), randomBytes); CryptReleaseContext(hProvider, 0); However, I'm running into trouble attempting to pass these randomBytes to boost::mt19937. On Unix I do something similar to this: uint64_t GetSeed() { uint64_t seed; std::ifstream urandom; urandom.open("/dev/urandom"); urandom.read(reinterpret_cast<char*> (&seed), sizeof(seed)); urandom.close(); return seed; } boost::mt19937 rng(GetSeed()); That works OK on Unix I think. Could anyone suggest how to get the random data from the Windows CryptoAPI passed to boost::mt19937 as seed data? I don't normally program Windows systems, so this has been a bit of a challenge for me. Thanks for any tips, Ed

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convert from string to int
by pedro chaparro 11 Feb '10

11 Feb '10

hi, what is the sintax of the command to do a conversion from string to int? thanks -- Ing Pedro Alonso Chaparro Valero Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain

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Re: [Boost-users] [bhoost-build] error: Unable to find file or target named '/qt//QtGui'.
by Tim Odenthal 11 Feb '10

11 Feb '10

On Thursday 11 February 2010 17:18:08 boost-users-request(a)lists.boost.org wrote: > Hi! > > After successfully compiling our project dozens of times, I suddenly get > the error: Unable to find file or target named '/qt//QtGui'. > > I have absolutely no clue to what I could possibly have changed; I reverted > our whole jamtree to the date before the last successful compilation... Hmm I seem to have accidentally changed either user- or site-config file: if I add import qt ; using qt : /usr/share/qt4 ; to my user-config.jam, it all works again... Sorry... Tim -- Dipl.-Phys. Tim Odenthal Afdeling Mechatronica, Biostatistiek en Sensoren, Departement Biosystemen Faculteit Bio-ingenieurswetenschappen K.U. Leuven Belgium Mailing address: Afd. MeBioS, Kasteelpark Arenberg 30 B-3001 Heverlee Belgium Phone: +32 (0) 16 328595 Mobile: +32 (0) 474 32 42 38 Email: Tim.Odenthal(a)biw.kuleuven.be

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Move semantics
by Andy Venikov 11 Feb '10

11 Feb '10

Does boost provide any tools that help generate move-semantics classes? I've seen several references to boost:move(), but are there generic base classes that could be inherited from (or some other means) that could help me in automatically generating move-semantics classes. Something similar to MOJO? Thanks, Andy.

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[Boost] Is this library availble for 64 bit?
by Jaiswal, Usha [OS-IE] 11 Feb '10

11 Feb '10

Is there any version of Boost for 64 bit.

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Re: [Boost-users] [CMake] FindBoost: Boost_ADDITIONAL_VERSIONS : what to do for trunk
by Hicham Mouline 11 Feb '10

11 Feb '10

> -----Original Message----- > Subject: [CMake] FindBoost: Boost_ADDITIONAL_VERSIONS : what to do for trunk > Hi, > I use the trunk checkout of boost as well as released versions. > I have it installed under \Program Files > - boost-trunk > - boost_1_41_0 > Is there any support at all for a non-number version? > I want to find the include directory and some of the libraries as well, > rds, Hello, Is FindBoost Boost_ADDITIONAL_VERSIONS able to handle boost trunk? Regards,

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wrapping callback fonction from fltk2
by fayssal smawi 11 Feb '10

11 Feb '10

I'm a basic user of boost::python, I have just start with it this month and I look into wrapping FLTK2, I have wrapped the basics Widgets and they work great, except for collabck fonctions. I have find an old message in this mailng list refering to the same poblem with fltk but honestly I didn't understand. http://lists.boost.org/Archives/boost/2001/04/10820.php if someone can help me with an exemple I will be grateful plz I need help

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file_mapping and network failure problem
by Marko Pietarinen 11 Feb '10

11 Feb '10

Hi, I use boost::interprocess::file_mapping to map certain data files (data files are on server). Then I use boost::interprocess::mapped_region with that file-map to access the data. The following is pseudo code: // file-map is initialized first file_mapping fileMap(filename); mapped_region mappedRegion(fileMap); // later some where else data is read from file float * ptr = reinterpret_cast<float *>(mappedRegion.get_address()); float value = ptr[index]; This works normally fine. But sometimes you map data file when network is ok After that you need to look some data (in portion that is not on memory allready) when the network is not in use, then program just crashes. This is pretty logical to me. But the question is, can I some how detect the problem and prevent the crash. I tried to catch exception but no help there. And is this the rigth way to use mapped files? Marko

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BOOST_SCOPE_EXIT doesn't detect argument types
by Braden McDaniel 11 Feb '10

11 Feb '10

I have the following code: typedef std::vector<boost::intrusive_ptr<node> > children_t; children_t children = group.children_.value(); ⋮ children.push_back(*n); bool succeeded = false; BOOST_SCOPE_EXIT((&succeeded)(&children)) { if (!succeeded) { children.pop_back(); } } BOOST_SCOPE_EXIT_END This is yielding compiler errors like this: 193: error: ‘boost_se_params_t_193::boost_se_param_t_0_193’ is not a type 193: error: ‘boost_se_params_t_193::boost_se_param_t_1_193’ is not a type The block of code emitted by the preprocessor starts like this: typedef void (*boost_se_tag_0_193)(int &succeeded); typedef void (*boost_se_tag_1_193)(int &children); … which leads me to conclude that, for some reason, BOOST_SCOPE_EXIT isn't picking up the correct types for its arguments. Has anyone seen this sort of thing before? Is there something I can do to play more nicely with BOOST_SCOPE_EXIT? -- Braden McDaniel <braden(a)endoframe.com>

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[fusion] Use of FUSION_MAX_VECTOR_SIZE in headers
by Gabriel Redner 10 Feb '10

10 Feb '10

Hi all, I'm trying to use fusion vectors with more than 10 elements, but I'm running into some trouble. I'm using fusion as an implementation detail of some header-based tools, which get included (often indirectly) by some translation units. The tools require large fusion vectors, but I don't want client code (i.e. the .cpp files) to have to care about this. I was under the impression that I could just add: #define FUSION_MAX_VECTOR_SIZE 20 #include <boost/fusion/container.hpp> in my tool's header file, and be off to the races. It seems that this works only if no other fusion header has been included previously in the same translation unit: #include <boost/fusion/container.hpp> ... #define FUSION_MAX_VECTOR_SIZE 20 #include <boost/fusion/container.hpp> ... // Error - too many template arguments! boost::fusion::make_vector(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15); I really don't want to have to track down every translation unit which is (usually indirectly) including my tool's header. I am under the impression that boost::function is fine with client code redefining its limit macro and re-including its header, but perhaps fusion does not have the same feature? I also realize that for vector itself I can just include vectorN.hpp and use vectorN<...>, but if I want to use the generation functions (make_vector, vector_tie) it seems I'm stuck. Is there a workaround, or just something obvious that I'm doing wrong? Thanks, -Gabe

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[boost][graph] astar_search bug
by Andy Tompkins 10 Feb '10

10 Feb '10

Hi, I have been upgrading some projects to use boost version 1.42.0 with Visual Studio 2008 and found (I believe) a bug with astar_search. I have attached a minimal program that will reproduce the problem, and a patch file to correct it. I created a ticket (Ticket #3917) that has these files attached and attached them to this. Regards, Andy Tompkins

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BOOST:ASIO how to do HTTPS authentication using SSL
by Kumar, Akhilesh 10 Feb '10

10 Feb '10

Hi, I have working implementation of HTTP authentication using WinInet but I want to switch to BOOST::ASIO but I am not sure how to send the authentication request to HTTP server using BOOST::ASIO/SSL. Just to give an idea here is code snippet of the WinInet. Is there any code sample available to do the same using boost::asio and SSL? How do we send user name and password using SSL is there any special function or we have to create our own request string, and how it is going to look like? Here is the partial example code using WinInet Connect(serverURL)/*https://someurl.com/... */ OpenRequest("POST",.....) if(!InternetSetOption(m_hHttpConnection, INTERNET_OPTION_USERNAME, (void*)string_cast<string>(userID).c_str(), userID.size()) || !InternetSetOption(m_hHttpConnection, INTERNET_OPTION_PASSWORD, (void*)string_cast<string>(passWord).c_str(), passWord.size()) /* Set some other security Flag */ ) { m_lastResult = HRESULT_FROM_WIN32(GetLastError()); } DWORD dwSize, dwCode; dwSize = sizeof (DWORD) ; if ( !HttpQueryInfo (m_hRequest, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, &dwCode, &dwSize, NULL)) { m_lastResult = HRESULT_FROM_WIN32(GetLastError()); return false; } Example code End. Thanks, Akhilesh

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Re: [Boost-users] boost any questions and praise
by Pete Bartlett 10 Feb '10

10 Feb '10

Alan Tennant wrote: >Thanks for the info. Can it be done (at all, at the moment, elegantly, practically, by turning a std::type_info into a type) ? Depending on exactly what you are trying to do, the Boost.Variant library may be more useful than Boost.Any.

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[filesystem] how to get wstring value from wpath::external_file_string() with gcc?
by Sachin Garg 10 Feb '10

10 Feb '10

I want wpath::external_file_string to return a unicode wstring. On windows, with my visual studio project settings set to "Unicode character set", it correctly returns a wstring. But on OSX (using xcode/gcc) it tries to return a string. I believe this is due to Traits::external_string_type. This is supposed to be OS specific string type and I want my application to use Unicode for all interactions with OS (filesystem paths, command-line parameters etc), then boost will also set this type to wstring. How do I configure my project such that this trait is set to wstring? Any xcode settings or gcc parameters or #defines? SG

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Re: [Boost-users] [fusion] problems with accumulate metafunction
by Benedetto Proietti 10 Feb '10

10 Feb '10

Greetings. I am kind of newbie to Boost.Fusion. I have a sequence of "Field"s: typedef fusion::vector< Field<int, 3, Check1, ..>, Field<float, 8, Check2, ..>, Field<MyString, 2, Check3, ..>, ... > MySequence; Each "Field" knows how to (de)serialize, has some checking policy and a few more little stuff. "Field" also has a "int" property "TypeSize": static const int TypeSize = somevalue_known_at_compile_time; I'd like to traverse the type "MySequence" and get the sum of all the sizes at compile time. Like: Field<int,3,Check1>::TypeSize + Field<float, 8, Check2>::TypeSize + Field<MyString,2,Check3>::TypeSize + ... ; I tried playing with fusion::accumulate and mpl<int_> but couldn't do it. There's no much documentation/examples about fusion (correct me if I am wrong please). How can I get the accumulated sum of Field<...>::TypeSize of all the members in "MySequence"? Thanks in advance, Benedetto PS: It's not really a priority (the cost of doing that at runtime once for object is minimal), but I'd really like to fully understand Fusion, which I have found very useful so far.

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boost::filesystem with wstring
by ariasgore＠gmx.de 10 Feb '10

10 Feb '10

Hello, I am using Boost 1.41.0 with Visual Studio 2005 and noticed some strange behaviour which I am unsure how to fix. When I call boost::filesystem::remove_all("somepath"); everything compiles and links fine. But now a project works entirely on wstring basis so it happens that I pass something like boost::filesystem::remove_all(L"somepath"); Code compiles still fine but it throws many linker errors like Fehler 2 error LNK2001: nresolved external symbol ""__declspec(dllimport) class boost::filesystem::file_status __cdecl boost::filesystem::detail::status_api(class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > const &,class boost::system::error_code &)" (__imp_?status_api@detail@filesystem@boost@@YA?AVfile_status@23@ABV?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@AAVerror_code@system@3@@Z)". Fehler 3 error LNK2001: nresolved external symbol ""__declspec(dllimport) public: static class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > __cdecl boost::filesystem::wpath_traits::to_external(class boost::filesystem::basic_path<class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> >,struct boost::filesystem::wpath_traits> const &,class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > const &)" (__imp_?to_external@wpath_traits@filesystem@boost@@SA?AV?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@ABV?$basic_path@V?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@Uwpath_traits@filesystem@boost@@@23@ABV45@@Z)". So what happens here? I searched boost for some wstring support or similar but had no luck. It is quite unhandy to transform to and from wstring<>string. Thanks Sam -- NEU: Mit GMX DSL über 1000,- ¿ sparen! http://portal.gmx.net/de/go/dsl02

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string comparison
by pedro chaparro 10 Feb '10

10 Feb '10

hi, i'm getting a message from a socket like char *datos3="UNBLOCK"; size_t len2 = socket.read_some(boost::asio::buffer(buf2), error2); datos2=(buf2.data()); *//and compare datos2 and datos3* ost::is_equal test; if (test(datos2,datos3)) { std::cout << "Equal" << endl; return; } else std::cout << "NO Equal" << endl; but the string in Datos2 is : UNBLOCK@= ��< , what i got that strange charateres? thanks Ing Pedro Alonso Chaparro Valero Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain

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calling a method in executable from dll
by Lloyd 10 Feb '10

10 Feb '10

Hi, I have a plug-in and an executable. I want the executable to expose certain functions to the dll. To do that, the address (reference) of the object in executable is passed to the dll. and I thought of invoking the methods in executable using this reference. But during the plugin compile time I got a linking error "unresolved external symbol". I understand the basic reason behind this error, but how can we solve this? Thanks in advance, Lloyd ______________________________________ Scanned and protected by Email scanner

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Convert ptime to UTC based on runtime current machine timezon
by Wintaki Hagabashi 10 Feb '10

10 Feb '10

Hi, How can I convert a boost ptime to UTC given the current machine settings, without hard coding anything? I found the c_local_time_adjustor but it only has a utc_to_local() method. I tried reading through some of the local_time documentation but got lost with all the time zones. I realize they are important but for this application the software much always convert a ptime (that will be in the current machines local time) into UTC. I am running on Linux fwiw. Thanks for any help Wayne _________________________________________________________________ Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. https://signup.live.com/signup.aspx?id=60969

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PP: transform BOOST_PP_SEQ_FOR_EACH(macro, data, seq) to vertical repetition
by Hicham Mouline 09 Feb '10

09 Feb '10

Hi, For a given result of BOOST_PP_SEQ_FOR_EACH(macro,data,seq) It is possible to obtain the same result, but in vertical repetition instead, with: #define BOOST_PP_LOCAL_MACRO(n) macro(_,data, BOOST_PP_SEQ_ELEM(n, seq)) #define BOOST_PP_LOCAL_LIMITS (0,BOOST_PP_DEC( BOOST_PP_SEQ_SIZE(seq))) #include BOOST_PP_LOCAL_ITERATE() I can't see the way to implement a new macro called BOOST_PP_SEQ_FOR_EACH_VERTICAL(macro,data,seq) Regards,

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Reading response without blocking
by Kumar, Akhilesh 09 Feb '10

09 Feb '10

Hi, I am using boost ASIO for uploading file to a http server(I had everything working using WinInet but switching to boost::ASIO for portability reason.). I have upload working but at the end of upload I want to read the response from the server, but I am not sure how to find that there is not more data on the wire. I am using sync socket, so my call are blocking if there is no more data, here is what I need to know. How do I make sure that my call does not block if there is no more data? Or how do I know that there is no more data on the wire so don't try to read it? IS there any call which simply check and return if there is no more data? Can I use async read even though I am using sync socket for everything else. I don't' want to switch to async socket unless there is now way out of it. As sample code will be welcome Thanks, Akhilesh

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How to make boost.test log wstring?
by Alexey Badalov 09 Feb '10

09 Feb '10

Boost.test logs to ostream, which does not have an operator for wstring. Consequently, I cannot test wstring values. How can I fix this?

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Boost Graph Lib > A*
by Damien Maupu 09 Feb '10

09 Feb '10

Dear all, First Hello. Then does anybody knows how the a star search works for implicit graph? There is little information on the Internet. I found a pdf: A* Graph Search Within the BGL Framework http://www.cs.rpi.edu/~beevek/research/astar_bgl04.pdf But I wasn't able to run the implicit graph example because I am missing: #include <nonconst_bfs.hpp> and #include "test-astar-visitors.hpp" #include "test-astar-accept.hpp" In the online doc: http://www.boost.org/doc/libs/1_40_0/libs/graph/doc/astar_search.html It is said to use astar_search_no_init but I don't know how. Any clues? Thank you Sincerely, Damien

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