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[serialization] class template with virtual base
by Richard Crossley 27 Feb '08

27 Feb '08

Hi, I've been searching the archives but am not finding an answer... Is there any way to serialise D<> via a pointer to its base B when the types used to parameterise D<> are not known in advance? i.e. How do I register D<> with the serialisation library? For Example... struct B{ virtual void fn() =0; }; template<typename T> struct D : B{ virtual void fn(){}; }; B* b = new D<char>(); .... anArchive & b; Thanks, Richard.

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Re: [Boost-users] boost::crc32 - visual studio crt - bug?!
by gfsdgadas＠Safe-mail.net 27 Feb '08

27 Feb '08

I do not like the idea of changing my compile flags (I really do like that option for my debug builds!) just because of boost crc32. What about changing the header the request way, marking all casts using &0xFF? I do not see any reason for those safe marks not being introduces into boost crc.

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Boost PP lib
by Hicham Mouline 27 Feb '08

27 Feb '08

hi, in an ealier post, i was helped to write explicit template instantiations as: #define FINH1 (EC)(EP)(AC)(AP) #define FINH2 (C)(D)(E)(F)(G) #define FINH3 (2)(3) #define M(r, product) template class Tree<BOOST_PP_SEQ_ENUM(product)>; BOOST_PP_SEQ_FOR_EACH_PRODUCT(M, (FINH1)(FINH2)(FINH3)) That nicely generated: template class Tree<EC,C,2>; template class Tree<EC,C,3>; template class Tree<EC,D,2>; template class Tree<EC,D,3>; ... what i need now is coupling FINH2 and FINH3 (i don't want their crossproduct) as in: #define FINH1 (EC)(EP)(AC)(AP) #define FINH2 (C,2)(D,2)(E,3)(F,3)(G,3) #define M(r, product) template class Tree<BOOST_PP_SEQ_ENUM(product)>; BOOST_PP_SEQ_FOR_EACH_PRODUCT(M, (FINH1)(FINH2)) But that does't work because the commas in FINH2 are taken as macro arguments which fails... ideas are appreciated... regards,

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Boost Interprocess docs
by Wolfram Stering 27 Feb '08

27 Feb '08

Hello List, if I wanted to read Boost.Interprocess documentation, where would I look for it? I want to evaluate Boost.Interprocess for use in a setuid application with requires a GUI part using a backend (setuid) and a frontend (gui) process. Boost.Interprocess is scheduled to be included in release 1.35, if I remember correctly. thanks for your help, best regards, -wolfi -- Wolfram Stering (Entwicklung) HALE electronic GmbH Eugen-Müller-Straße 18, 5020 Salzburg, Austria Tel: +43 (662) 439011 550 Fax: +43 (662) 439011 9 http://www.hale.at/ Firmenbuchnummer: FN 66801m HG Salzburg -- Scanned by MailScanner.

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circular_buffer iterator problem
by abir basak 27 Feb '08

27 Feb '08

Hi, I have a boost svn trunk checkout (latest one). It seems boost circular_buffer has a iterator problem for converting from non const to const iterator, on visual studio 7.1 (2003) release build only. Can someone check for it ? (It used to work on boost 1.34) for eg, using namespace boost::assign; typedef boost::circular_buffer<int> CB; std::vector<int> v; v+=1,2,3,4,5,6,7,8,9,10,11,12; CB buf(10,v.begin(),v.end()); CB::iterator it = buf.begin(); CB::const_iterator it1 = buf.begin();/// This line doesn't compile on release build only. a second (and little different) question, why boost::assign doesn't work with circular_buffer directly which has 2 iterator construct like most other STL containers ? thanks abir -- Abir Basak, Member IEEE Software Engineer, Read Ink Technologies B. Tech, IIT Kharagpur email: abir(a)abirbasak.com homepage: www.abirbasak.com

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boost::lambda::bind internal object storage
by Zian Smith 27 Feb '08

27 Feb '08

Hello, Can someone explain why I see 5 constructor calls here, but only 4 destructor calls? Is the bind function neglecting to destroy one of the internal copies made or am I missing something? I understand that if I use the "var" function, the problem is eliminated, but I'd still like to figure this out. I'm using boost 1.33.1 -Thanks! //================================= #include <iostream> #include <vector> #include <algorithm> #include "boost/lambda/bind.hpp" using namespace std; using namespace boost::lambda; struct woot { woot() { cout << "woot constr\n"; } woot(const woot& o) { cout << "woot copy-constr\n"; } ~woot() { cout << "woot destr\n"; } }; void do_nothing(const woot& w) { } int main() { woot w; vector<char> v; for_each(v.begin(), v.end(), bind(do_nothing, w)); } //================================= Output: ------- woot constr woot copy-constr woot copy-constr woot copy-constr woot destr woot destr woot copy-constr woot destr woot destr ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs

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ASIO ssl::stream read/write_some question.
by Derrick Hathaway 27 Feb '08

27 Feb '08

Could someone please shed some light on ASIO SSL reads and writes for me? The names of the read and write functions for the ssl::stream (read_some and write_some) imply to me that the buffer(s) may not be completely filled/sent with a read/write. Do I need to have some intermediate handler that will begin another async_read/write_some until my buffer is filled/flushed? The documentation doesn't seem to indicate that this is necessary. It makes sense from the example that the reads may not fill the provided buffer before invoking the handler. So it may be necessary to call read_some multiple times until the expected number of bytes is received. But is this also the case with writes, and if so, how do I manage multiple writes if I provide a vector of buffers to be written with and async_write_some? Thanks in advance. Derrick

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boost.serialization question
by Aljaz 27 Feb '08

27 Feb '08

Hello I use boost.serialization for data transfer betwen my server and client applications. The example of serialized data looks like: " 3b22 serialization::archive 4 0 1 2 7 request 1 0 0 1 0 1 2 1 " I've been wondering if there is any way to hide serialization:.archive in the data, maybe replace it with something like 'sa' .. Thanks a lot for help Best regards Aljaz

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Re: [Boost-users] Boost.Test unit testing examples: stale links
by Tim Allison 27 Feb '08

27 Feb '08

To see example 1, use: http://www.boost.org/libs/test/example/unit_test_example_01.cpp The obvious changes are needed for the other examples. (Someone else found these links and posted them at the almost unused forums on SourceForge.) From what I have been able to figure out, the most up to date examples and documentation are found at: http://www.patmedia.net/~rogeeff/html/utf/user-guide.html. I would like to know if you can compile the examples. I can not. I sent an email a week or so ago requesting help compiling the examples with g++. So far, I have not had a response. Tim Allison > ------------------------------ > > Message: 6 > Date: Tue, 26 Feb 2008 22:33:16 +0100 > From: Bram Kuijper <a.l.w.kuijper(a)rug.nl> > Subject: [Boost-users] Boost.Test unit testing examples: stale links > To: boost-users(a)lists.boost.org > Message-ID: <47C4859C.5000302(a)rug.nl> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hi all, > > I don't know if this is the right place for it, but I wanted to report a > number of stale links on the Boost.Test website. It regards the examples > of the Unit Testing Framework, example 1 to 5 on page > http://www.boost.org/libs/test/doc/examples/index.html > : > > http://www.boost.org/libs/test/doc/examples/unit_test_example1.html > http://www.boost.org/libs/test/doc/examples/unit_test_example2.html > http://www.boost.org/libs/test/doc/examples/unit_test_example3.html > http://www.boost.org/libs/test/doc/examples/unit_test_example4.html > http://www.boost.org/libs/test/doc/examples/unit_test_example5.html > > since I really would like to see some examples of this testing > framework, I wonder if it is possible to have these examples back online? > > thanks, > > Bram Kuijper > >

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[IOStreams] Inconsistency b/w docs and code of stream()
by Nitay Joffe 27 Feb '08

27 Feb '08

Hey guys, I'm working with the boost::iostreams library to create a stream object from a Device class I've implemented. I'm trying to call the constructor that allows setting of the buffer size and it is failing to compile on 64 bit. I used the documenation at http://www.boost.org/libs/iostreams/doc/guide/generic_streams.html#stream The docs say the constructor is of the form: stream(const T& t, std::streamsize buffer_size = default_value, std::streamsize pback_size = default_value); My code to create the stream looks like: MyDevice myDevice(...) MyStream(myDevice, (std::streamsize)500); On a 32 bit machine this works fine, but on a 64 bit one it does not compile. The parameters I'm passing in are not matching up with a constructor in the stream class so it tries to call MyDevice with the wrong set of parameters. I believe the culprit is the file iostreams/detail/push_params.hpp, which defines the buffer and pback size using: #define BOOST_IOSTREAMS_PUSH_PARAMS() \ , int buffer_size = -1 , int pback_size = -1 \ /**/ This macro is then used by stream and friends in their constructor declarations. On 64 bit machines std::streamsize is a long int, so the constructor parameters do not match up and compilation fails. Thanks, -n

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