November 2008 - Boost-users

--layout=system in user-config.jam?
by Raymond Wan 17 Nov '08

17 Nov '08

Hi all, In a recent post (a few weeks ago), someone asked if it is possible to remove the compiler name/version from the library name. i.e., libboost_math_c99-gcc43-mt-1_37.so --> libboost_math_c99-mt.so Someone replied that adding "--layout=system" to bjam would do the trick and indeed, that worked. When compiling Boost, I was wondering if it is possible to add this parameter to the user-config.jam file, rather than editting the Makefile directly? If so, what would be the syntax to do this? Somewhere, I read that user-config.jam "define[s] available toolsets" -- I guess this parameter is not a toolset, so it is not possible? The reason I am asking is rather silly -- but just that editting the Makefile is slightly more error-prone than sending a user-config.jam to someone (or backing it up myself for later use) since the Makefile could change based on what configure outputs. Thank you! Ray

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[Proto] Strange behavior with semantic action and custom tag function
by Joel Falcou 16 Nov '08

16 Nov '08

I'm stuck on some problem that may en dup silly. I have a DSL defined by the following grammar : struct dimen_grammar : bp::or_< ////////////////////////////////////////////////////////////////////////// // Terminals are dimensional values or integral values ////////////////////////////////////////////////////////////////////////// bp::or_< bp::terminal< dimensions<bp::_,bp::_> > , integer_grammar > ////////////////////////////////////////////////////////////////////////// // dimen can be added together or scaled by an integer // or shifted left or right by an integer ////////////////////////////////////////////////////////////////////////// ,bp::or_< bp::plus<dimen_grammar,dimen_grammar> ,bp::multiplies<dimen_grammar,integer_grammar> ,bp::multiplies<integer_grammar,dimen_grammar> ,bp::shift_left<dimen_grammar,integer_grammar> ,bp::shift_right<dimen_grammar,integer_grammar> > > {}; I've defined a proper callable_context that take care of my special terminals and built a terminal class. At this point, everythign works perfect : i can build expressions and evaluate them. Now I add a grammar with semantic action that helps me computes an aspect of those expression : struct dimen_size : bp::or_< ////////////////////////////////////////////////////////////////////////// // dimensionnal values terminal contains its own size value ////////////////////////////////////////////////////////////////////////// bp::when< bp::terminal< dimensions<bp::_,bp::_> > , dimension_of< bp::_value>() > ////////////////////////////////////////////////////////////////////////// // integral values has a size of 1 ////////////////////////////////////////////////////////////////////////// , bp::when<integer_grammar, bm::size_t<1>()> ////////////////////////////////////////////////////////////////////////// // size(d1+d2) = max(size(d1),size(d2)) ////////////////////////////////////////////////////////////////////////// , bp::when< bp::plus<dimen_grammar,dimen_grammar> , bm::max<dimen_size(bp::_left),dimen_size(bp::_right)>() > ////////////////////////////////////////////////////////////////////////// // size(d1*i) = size(d1) ////////////////////////////////////////////////////////////////////////// , bp::when< bp::multiplies<dimen_grammar,integer_grammar> , dimen_size(bp::_left) > ////////////////////////////////////////////////////////////////////////// // size(i*d2) = size(d2) ////////////////////////////////////////////////////////////////////////// , bp::when< bp::multiplies<integer_grammar,dimen_grammar> , dimen_size(bp::_right) > ////////////////////////////////////////////////////////////////////////// // size(d1<<i) = size(d1) ////////////////////////////////////////////////////////////////////////// , bp::when< bp::shift_left<dimen_grammar,integer_grammar> , dimen_size(bp::_left) > ////////////////////////////////////////////////////////////////////////// // size(d1>>i) = size(d1) ////////////////////////////////////////////////////////////////////////// , bp::when< bp::shift_right<dimen_grammar,integer_grammar> , dimen_size(bp::_left) > ////////////////////////////////////////////////////////////////////////// // Other returns 0 ////////////////////////////////////////////////////////////////////////// , bp::when<bp::_, bm::size_t<0>()> > {}; This works. If I remove the bp::when<bp::_, bm::size_t<0>()>, it fails to compile when I try to use a hand-overloaded operator<< for displaying expression values on standard output. So, is there anything I missed (like deactivating operator<< in the grammar somehow ?) ? Other question : When defining custom tag to build new function, why does the make_expr tempalte doesn't do check on its argument to see if it's match the grammar of the domain it's bound to use ? Seems I'm forced to add additional layer of SFINAE to prevent those function to get called on w/e types. Thanks in advance for help -- ___________________________________________ Joel Falcou - Assistant Professor PARALL Team - LRI - Universite Paris Sud XI Tel : (+33)1 69 15 66 35

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[asio] Header ordering problems
by Robert Ramey 16 Nov '08

16 Nov '08

#include <boost/date_time/posix_time/posix_time.hpp> #include <boost/asio.hpp> produces the error message at compile time: 1>c:\boost_1_37_0\boost\asio\detail\socket_types.hpp(27) : fatal error C1189: #error : WinSock.h has already been included while #include <boost/asio.hpp> #include <boost/date_time/posix_time/posix_time.hpp> does not. Same problem occurs when including any of the headers in boost/thread/... Robert Ramey

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About boost::asio
by Ken zhang 16 Nov '08

16 Nov '08

Hi Dear all I want to handle socket close event in my connection, but I can't found mothed in ip::tcp::socket,How can I handle close event for socket? Thanks -- Best Regards, Yours Kennir

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library name for boost 1.36
by Alain Leblanc 16 Nov '08

16 Nov '08

Hi, I just built boost 1.36 for the mac and all the library names have xgcc40 inserted in the middle, such as libboost_iostreams-xgcc40-mt-1_36.dylib. It breaks my makefiles that contain the option " -lboost_iostreams". Is there a reason for the xgcc40 in this version and not the others, and is there a way to instruct bjam not to include it in the filename. Thank, s

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[iostreams] How to overload the flush on a outpou stream
by vicente.botet 16 Nov '08

16 Nov '08

Hi, I want to to take a specific action when I flush an output stream. Can Boost.Iostreams be of any use? Thanks is advanve, Vicente

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get_posix_category in boost 1.36
by Daniel França 16 Nov '08

16 Nov '08

Hi people, I got an error of undefined get_posix_category in Boost 1.36, I found this article: http://blog.cplusplus-soup.com/2008/11/boost-c-library-patches-1360.htmlthat tell me that there's no get_posix_category on Boost 1.36: *Boost.System's Missing 'get_posix_category'* In Boost 1.36.0, Boost.System's get_posix_category function had been removed. For strict backwards compatibility, it has to be put in to let older versions of libraries that use the function to link properly. This has been submitted as issue (with patches attached) That's why I cant compile the asynchronous TCP Server example, I tried to get the patch but itsn't online anymore, anyone know how can I solve that? Best Regards, -- Daniel C. França Tecnosapiens: http://tecnosapiens.wordpress.com 24Quadros: http://24quadros.wordpress.com

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[phoenix] adding const to member_variable bind
by Christian Henning 16 Nov '08

16 Nov '08

Hi there, the following code doesn't compile since I'm iterating over a constant vector of points. struct point { double _prob; double _x; }; void test( const std::vector< point >& d ) { double sum_prob = std::accumulate( d.begin() , d.end() , 0.0 , arg1 + bind( &point::_prob, arg2 ) ); } int _tmain(int argc, _TCHAR* argv[]) { std::vector< point > d; test( d ); return 0; } My question is how can I convert or cast the "&point::_prob" into a const reference? I tried several ways but they all don't work. The only thing that worked was to add const getter function in my point structure. Like this: struct point { point( double prob, double x ) : _prob( prob ), _x( x ) {} const double& prob() const { return _prob; } double _prob; double _x; }; Thanks, Christian

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tokenizer
by Vidhu Choudhary 16 Nov '08

16 Nov '08

Hi I am using tokenizer from boost. On my windows machine I want to install tokenizer only. Can you please suggest how can I do that Thank you Vidhu

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Boost conformance to standard c++0x libraries statement
by vicente.botet 15 Nov '08

15 Nov '08

Hi, There are a lot of Boost libraries already included in the C++ Standards Committee's Library Technical Report (TR1). More Boost libraries are proposed for the upcoming TR2. As all these libraries do not conform completly to the standard for different raisons: the compliler do not support some feautres of the C++0x, the emulation seems to complex or any other justification. I think that it will help the users to have a clear statement, library by library, of which features the library conform to or not. This statement should contain the library feature(class, typedef, constants, functions, ...), dependencies on other C++0x features, whether it conforms on C++0x compilers supporting the needed compiler features, if it use some workaround on other compilers and finaly for the non conformant features why the library do not conforms. It will be also useful to state which features on the library are not on the standard. I have prepared as an example a table for the Boost.Thread library (limited tothread and this thread API). Anthony the informations on these tables could be wrong. Attached boost_thread_conformance.qbk and boost_thread_conformance.html Any comments and ideas are welcome. HTH, Vicente

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