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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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