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[boost-users][asio] Interaction problem with signals2?
by Germán Diago 24 Aug '10

24 Aug '10

Hello. I'm trying to call a signal after an async_read from inside a function called by boost::asio::io_service. The run function runs in a thread, and the observers are connected in a different thread. This is causing errors. It's my program or it's not possible to invoke a handler that is running in another thread from io_service::run? Thanks in advance.

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using Regex and other Boost libraries that require a build
by Bhushan Inamdar 24 Aug '10

24 Aug '10

Hi all, I am relatively new to Boost but was wanting to install and do development on it for long now. Finally, I can now spare some time for that. I am using Visual Studio 2008 professional edition as a development IDE. I have installed Visual Assist X to assist me with the intellisense as well. I am having Windows 7 ultimate installed on my machine and I am trying to install latest i.e. BOOST 1.44.0 version. So far I have had partial success. I am able to build and compile the sample program on Boost site that needs only headers. But I am facing problems while building programs that reference other libraries. So here is what I did: - Tried unsuccessfully to install it using BoostPro; installation broke quite a few times. - So I gave up and downloaded the Boost compressed version and extracted it successfully in C: drive - The current location is C:\Program Files\Boost\Boost_1_44_0\....and the respective dir structure thereafter. - Then I downloaded the bjam utility and extracted it and then copied it to the Boost root dir - Following this, I double clicked bjam.exe and it ran the build. However, a lot of projects were skipped and virtually nothing was build. - Then I realized that it was Windows 7 we were dealing with and then immediately ran Bjam.exe as an administrator. - This time, it took a lot longer and I was seeing the compilation in progress and I think that it was satisfactory. - Then comes the part of linking the libraries through VC++ compiler to the code. - I then navigated to Tools->Options->Projects and Solutions->VC++Directories and selected Win32 on first combo on top left - There I selected Includes in the other combo on top right and added the C:\Program Files\Boost\Boost_1_44_0\Boost to the list - Then on the same page I changed the top right combo to Libraries and added C:\Program Files\Boost\Boost_1_44_0\libs to the list - Considering that I should not miss out on any other libraries, I added C:\Program Files\Boost\Boost_1_44_0\bin.V2 to the list as well; this directory was constructed as a result of build by Bjam.exe - Following that, I quickly followed the 2 tutorials on Boost site 1 for simple iostream (which worked after some adjustments) and the other for regex (which did not work). - Considering I might still have missed something, I went on to add the path C:\Program Files\Boost\Boost_1_44_0 to System variables and made changes to VC IDE accordingly. - Also, to mention, I did not find any simple way to build the libraries that need a separate build and neither did I found any simple tutorial on Boost site...where they have put the regex sample that extracts matched text from a paragraph So my questions: - I want to know if I have missed anything to build any of Boost libraries or link to VC IDE or else? - Is there a better way to make sure if all the variants of all the libraries are build and linked with VC? - Is there a way to do this with CMake? - I read that, some libraries have some dependencies like libz...etc. where can I get the list for all Boost libraries? - Although this Question is not related to Boost, on a lighter note, I would just want ask this. Please ignore this if it does not hold ground. I have installed Boost after I installed Visual Assist for Visual Studio. Hence, whereever I use Boost members and classes, it keeps on saying that refactoring data is not available. Hence, I presume that, if I uninstall and reinstall Visual Assist, it should help? Or in other words, is there a better way to refactor boost library code so that intellisense can pick that? I will continue searching for this and hope that there is an option in Visual Assist itself. Nonetheless, it is not as important as Boost build related questions. Hope to hear from you soon... Thanks and Regards, Bhushan.

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preprocessing error
by Arnaud GELAS 24 Aug '10

24 Aug '10

Hi all, When compiling some code using boost, I get the following error: /usr/include/boost/type_traits/type_with_alignment.hpp:142: error: Not a valid preprocessing token ")BOOST_PP_LIST_FOLD_LEFT_CHECK_BOOST_PP_IIF" For more details, I posted the log here: http://gofigure2.sourceforge.net/temp/boost-error.txt Any idea what I could do wrong? My machine is a Fedora 13 (64 bits), the installed version of boost is 1.41.0, and I used gcc 4.4.4... Thanks in advance, Arnaud

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Boost.Format
by John Dlugosz 24 Aug '10

24 Aug '10

I'm using Boost.Format as a simple way to create strings to pass to exception constructors and primitive logging output during debugging (Windows' OutputDebugString). I see that the format object can be inserted into a stream, easily. But, with arguments, it's awkward to convert it to a string -- you need extra parens around the whole thing. Is there some good reason why there is no implicit conversion to string? E.g. string message= boost.format("blah") % argument % errorcode; OutputDebugStringA (message.c_str()); throw std::runtime_error (message); Or, is there some simple way that I'm missing? Thanks, --John TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

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building all libs
by Kraus Philipp 24 Aug '10

24 Aug '10

Hi, I use boost with thread, iostreams and random. I compiled bjam first and uses them to compile all, but I must call every lib manual with ./bjam variant=release toolset=darwin threading=multi variant=release libs/iostreams/build How can I build the full boost with all libs in one run? Thanks Phil

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cstdint.hpp causes warnings on VC10
by Michael Kaes 24 Aug '10

24 Aug '10

HI all, after switching to VC10 I recognized that including the cstdint.hpp header causes a warning. After looking into this header I saw that all defines like INT8_C are guarded to prevent multiple defines, except of the UINT8_C define (cstdint.hpp Line:400). Is this done on purpose because to me it looks as if the guard was just forgotten. Regards, Michael

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[accumulators] chaining accumulator outputs
by Allen Chuang 24 Aug '10

24 Aug '10

Is there a way to chain the output of an accumulator and use it as the input of another accumulator? The sort of case I am thinking about is for example calculating the max of a rolling_mean. One obvious way to do this is to write a new rolling_mean_max accumulator and make it depend on rolling_mean, but the inner logic would be 99% duplicate of max. I was wondering if there was a way to do this without so much code duplication. -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01

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number cores / cpu
by Kraus Philipp 24 Aug '10

24 Aug '10

Hello, can I determine how many physical cpu and cores are installed in a system with the boost lib? Under *nix I would read /proc but I would like to do that with boost, because of "os-less". Thanks Phil

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boost::asio SSL connection thru proxy server
by Kumar, Akhilesh 24 Aug '10

24 Aug '10

Hi, I am writing a boost socket client using boost::asio to do secure HTTP (HTTPS) communication. I Implemented my client based on the code sample based on (http://www.boost.org/doc/libs/1_39_0/doc/html/boost_asio/example/ssl/client…) with little changes as I am using sync socket. My client woks fine, when I am connecting to server directly, but I am not sure what changes I need to make when my communication going thru proxy. The unsecure connection(HTTP) work fine thru proxy, and here is what I do for unsecure connection, 1. Initialize boost socket(IO service and other stuff). 2. Resolve and Connect to Proxy server. 3. Start writing to actual server(HTTP send request). 4. Start uploading/downloading. 5. Close Socket. But I can't use this above procedure for (SSL) secure connection as I need to do handshaking with the server before I can write anything if my understanding is correct. Can somebody give me some pointer or code sample or step I need to do when I am doing secure connection thru proxy server. Just to clarify Microsoft WinInet does do (secure) HTTPS connection thru same proxy fine. If providing my code sample I am using for SSL might help understand the problem I can provide that. Thanks in advance for any help. Akhilesh Kumar

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Using boost::bind with stl algorithms
by przemyslaw.sliwa＠uk.bnpparibas.com 24 Aug '10

24 Aug '10

Hello, I have the following question. I have two containers std::set<std::string> insertedEvents; std::vector<std::string> eventNames; How I would like to copy all those elements from eventNames which are not in insertedEvents. Can this can be done somehow using the boost::bind feature? I am doing it at the moment using a silly loop: for(size_t i=0; i<eventNames.size(); i++) { if (m_insertedEvents.find(eventNames[i])==m_insertedEvents.end()) eventNamesDegraded.push_back(eventNames[i]); } Thanks for any kind of help, Pshemek ___________________________________________________________ This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is prohibited. Please refer to http://www.bnpparibas.co.uk/en/information/legal_information.asp?Code=ECAS-… for additional disclosures.

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