August 2009 - Boost-users - lists.preview.boost.org

Why is size param required for BOOST_PP_TUPLE_TO_LIST(size, tuple) ?
by Mathieu Malaterre 06 Aug '09

06 Aug '09

Hi there, I am looking at: http://www.boost.org/doc/libs/1_39_0/libs/preprocessor/doc/ref/tuple_to_lis… Just ouf of curiosity why is size required ? Can't the number of argument be deduced using the preprocessor ? Eg.: http://groups.google.com/group/comp.std.c/browse_thread/thread/77ee8c8f92e4… Thanks, -- Mathieu

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[program options] the default value is to long.
by W Eryk Wolski 06 Aug '09

06 Aug '09

At runtime I am getting the following error: Assertion failed: line_length > first_column_width, file libs\program_options\src\options_description.cpp, line 460 It's due to a quite long default value (path to file) ("input-baf" , po::value<std::string>()->default_value(filename),"\t baf file to process") Is there a way to increase first_column_width? Thanks in advance. -- Witold Eryk Wolski Heidmark str 5 D-28329 Bremen tel.: 04215261837

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bjam options
by mike_wilson 06 Aug '09

06 Aug '09

Hi, Was wondering if anyone know how to use the bjam options just to build the multi thread library? Thanks. -- View this message in context: http://www.nabble.com/bjam-options-tp24845152p24845152.html Sent from the Boost - Users mailing list archive at Nabble.com.

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boost.array query
by Sean Farrow 06 Aug '09

06 Aug '09

Hi: I'm using boost.array in a call (waitForMultipleObjects) to be specific. I am passing the c_array() (i.e void const *) if I do this do I need to use 0 or can I still use 1-based indices for my switch statement.Any help appreciated. Sean.

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[coroutine] Stack corruption?
by Pavel Shevaev 06 Aug '09

06 Aug '09

Guys, I'm playing around with Boost.Coroutine experimental package[1] and it looks like it's corrupting the stack. I can't say for sure if it's a stack corruption, however, my application produces a seg.fault when running acceptance tests and gdb can't fully show the core dump backtrace saying "Backtrace stopped: previous frame inner to this frame (corrupt stack?)". If there are any coroutine users around, could you please give any tips on proper usage of this package, its limitations, etc? I had really high hopes for this package and really don't want to go back to the ugly non-coroutine logic. Thanks P.S. I'm using gcc-4.3.3 on linux x86(_64) [1] http://www.crystalclearsoftware.com/soc/coroutine/index.html -- Best regards, Pavel

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Compiling With Boost’s UBlas Numeric Binding Library to Solve Ax=b Linear System
by Peverall Dubois 06 Aug '09

06 Aug '09

I am using Numeric Library Bindings for Boost UBlas to solve a simple linear system: __BEGIN__ #include<boost/numeric/ublas/matrix.hpp> #include<boost/numeric/ublas/io.hpp> #include<boost/numeric/bindings/traits/ublas_matrix.hpp> #include<boost/numeric/bindings/lapack/gesv.hpp> #include <boost/numeric/bindings/traits/ublas_vector2.hpp> namespace ublas = boost::numeric::ublas; namespace lapack= boost::numeric::bindings::lapack; int main() { ublas::matrix<float,ublas::column_major> A(3,3); ublas::vector<float> b(3); for(unsigned i=0;i < A.size1();i++) for(unsigned j =0;j < A.size2();j++) { std::cout << "enter element "<<i << j << std::endl; std::cin >> A(i,j); } std::cout << A << std::endl; b(0) = 21; b(1) = 1; b(2) = 17; lapack::gesv(A,b); std::cout << b << std::endl; return 0; } __END__ I tried compiling it with the following command: g++ -I/home/foolb/.boost/include/boost-1_38 -I/home/foolb/.boostnumbind/include/boost-numeric-bindings solve_Axb_byhand.cc -o solve_Axb_byhand but fail with the following error: media/disk/tmp/ccbd973l.o: In function `boost::numeric::bindings::lapack::detail::gesv(int, int, float*, int, int*, float*, int, int*)': solve_Axb_byhand2.cc:(.text._ZN5boost7numeric8bindings6lapack6detail4gesvEiiPfiPiS4_iS5_[boost::numeric::bindings::lapack::detail::gesv(int, int, float*, int, int*, float*, int, int*)]+0x59): undefined reference to `sgesv_' collect2: ld returned 1 exit status __END__ What's wrong with my approach? - G.V

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Xpressive Character Literals
by Etienne Philip Pretorius 05 Aug '09

05 Aug '09

Hello List, Just a quick question; Xpressive seems not to compile when I use 0x?? instead of 'a' for regular expressions. Eg. sregex characters = +(set=0x20,0x0A,0x0D,0x20,0x33); Is there perhaps a way to accomplish this in Xpressive? Thank you, Etienne

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Boost example programme compilation error (Sun C++5.8 on Solaris 5.8)
by Bernd Zwatschka 05 Aug '09

05 Aug '09

Hi, we're new to Boost and trying to compile the example programme from the getting started page (compiler version: Sun C++ 5.8 2005/10/13, OS: Solaris 5.8) with Boost release 1_39. I'm getting the following error upon compilation: "/finag/ZwatschB/boost_1_39_0/boost/lambda/detail/operator_lambda_func_base.hpp" , line 212: Error: Initializing std::ostream & requires an lvalue. "test.cc", line 12: Where: While instantiating "std::for_each<std::istream_iterator<int, char, std::char_traits<char>, int>, boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda:: bitwise_action<boost::lambda::leftshift_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lam According to the release notes, Boost has been tested on C++ 5.8 on Solaris 5.10, so I'm assuming our configuration of compiler / OS is to blame? Is there a way of getting the 1_39 release working on Solaris 5.8 or do we have to switch to an earlier version of Boost? Or could there be another reason for the compilation error? Any pointers on this would be much appreciated. Thanks, Bernd

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Help in altering SSL example
by Ed Curren 05 Aug '09

05 Aug '09

Hello everyone, First, please excuse me if this question has already been asked and addressed. I searched what I was able to of the list and did not find information helpful to me. I am using the boost asio SSL examples as my starting point. At the moment the example simply takes a chunk of the overall data sent to the server and writes it back to the client, (simple echo). My goal is to have the server collect the entire message then move onto a message parsing routine that I will write. I have read through the code of many of the examples, and tried an endless combination of ideas in the code, but all have failed to read the entire message and then move onto a parsing function. Would someone please be kind enough to show me how to accomplish this? Thanks very much.

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Important: Boost server downtime on August 5, 2009
by Doug Gregor 05 Aug '09

05 Aug '09

The Boost mailing lists, web server, and Subversion server will be offline tomorrow (Wednesday, August 5th) from 8:00AM EDT to 9:00AM EDT while we upgrade the mailman software. My apologies for the late notice. - Doug

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