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Re: [boost] Boost regression notification
by Aleksey Gurtovoy 15 Jun '05

15 Jun '05

Daniel Wallin writes: > David Abrahams wrote: >> Oh, crud. How dangerous is it? > > I'm not sure. You'd have to ask Aleksey about that. He said that he > would apply the fix though, so I think it will happen. It's in the CVS now. Thank you once again, Daniel! -- Aleksey Gurtovoy MetaCommunications Engineering

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Who's Using Boost?
by John Maddock 15 Jun '05

15 Jun '05

There are now a set of prototype "Who's Using Boost?" pages available at: http://freespace.virgin.net/boost.regex/who/html/index.html Comments and suggests welcome, but in particular we need more case studies/products etc that are using Boost to be listed. If you have a product or project that could be listed then please see the submission guidelines at: http://freespace.virgin.net/boost.regex/who/html/who_s_using_boost_/submit.… Regards, John.

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[thread] properly initialize read_write_mutex_impl data members
by Pedro Lamarão 15 Jun '05

15 Jun '05

This small patch fixes the order of initialization of members and adds missing entries. Entering libs/thread/test/ and calling bjam didn't produce errors; but I didn't see anything running. Is that the correct procedure to regression test the library? -- Pedro Lamarão Index: read_write_mutex.cpp =================================================================== RCS file: /cvsroot/boost/boost/libs/thread/src/read_write_mutex.cpp,v retrieving revision 1.20 diff -u -r1.20 read_write_mutex.cpp --- read_write_mutex.cpp 3 May 2005 20:42:09 -0000 1.20 +++ read_write_mutex.cpp 14 Jun 2005 14:07:24 -0000 @@ -364,15 +364,19 @@ template<typename Mutex> read_write_mutex_impl<Mutex>::read_write_mutex_impl(read_write_scheduling_policy::read_write_scheduling_policy_enum sp) - : m_num_waiting_writers(0) + : m_prot() + , m_sp(sp) + , m_state(0) + , m_waiting_writers() + , m_waiting_readers() + , m_waiting_promotion() + , m_num_waiting_writers(0) , m_num_waiting_readers(0) + , m_state_waiting_promotion(false) , m_num_waking_writers(0) - , m_num_max_waking_writers(0) , m_num_waking_readers(0) + , m_num_max_waking_writers(0) , m_num_max_waking_readers(0) - , m_state_waiting_promotion(false) - , m_state(0) - , m_sp(sp) , m_readers_next(true) {}

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fstream_test.cpp won't compile using VC++ 6.0
by Jason Heyes 15 Jun '05

15 Jun '05

I receive errors when I try to compile fstream_test.cpp using Microsoft Visual C++ 6.0. The first error I receive is this: fstream_test.cpp c:\boost\include\boost-1_32\boost\filesystem\fstream.hpp(29): error C2504: 'basic_filebuf<char,char_traits<char> >': base class undefined c:\projects\examples\fstream_test.cpp(27): see reference to class template instantiation 'boost::filesystem::basic_filebuf<char,char_traits<char> >' being compiled Is there a workaround for this? Thanks. -- Jason Heyes jasonheyes(a)fastmail.fm -- http://www.fastmail.fm - Email service worth paying for. Try it for free

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Functional Programming in C++ Interest
by Joel de Guzman 15 Jun '05

15 Jun '05

Hi, I got this email from Jim Grundy. I thought I'd like to share this with you as I am also interested in what others might say. Here's Jim's email: <quote> I'm interested in learning about applications of declarative programming paradigms - particularly, but not exclusively, the functional paradigm - within the C++ programming community. I'm interested in part because I'm a member of the program committee for the CUFP (Commercial Users of Functional Programming) 2005 workshop. You can learn more about the workshop here: http://www.galois.com/cufp/ The CUFP workshop is co-located with the ICFP conference, but differs in that it is less formal venue and in that it focuses on the pragmatics of applications of functional programming rather less than on theory and or the study of the paradigm and the languages that support it themselves. The workshop has a broad area of interest. Although the "C" stands for commercial, its the applications aspect that is important. Open source applications, commercial or otherwise, are also of interest. The PC members for CUFP are probably most strongly associated with strongly typed higher-order functional languages, like ML, OCaml and Haskell, but we are interested in applications of the functional paradigm in any language. In particular, projects that make use of the functional paradigm (or other declarative paradigms, say via the LC++ library) in C++ would be of interest to us. <<I do not know what LC++ is, perhaps Jim meant FC++?>> I've learned a little about a variety of libraries available for functional programming in C++, notably the Lambda and Phoenix libraries available in boost. I would like to learn more about what applications are out there that use these or similar libraries in order to leverage the functional paradigm. I'd also like to learn a little about the experience of the developers of those applications. Is functional programming generally useful within the context of C++ application development, or is it likely to be a niche technique? Are "regular" C++ programmers making use of the paradigm, or is this guru territory only? Is this paradigm actually used in end user applications directly, or is it to be found only inside other general purpose libraries like XR and Spirit (two of the the places where I have seen the paradigm applied in C++). Any thoughts appreciated. </quote> As a library writer, I guess Doug Gregor's comment a few years ago sums it all up: About functional libraries in C++: They're gaining acceptance, but are somewhat stunted by the ubiquitousness of broken compilers. The C++ community is moving deeper into the so-called "STL-style" programming paradigm, which brings many aspects of functional programming into the fold. Look at, for instance, the Spirit parser to see how such function objects can be used to build Yacc-like grammars with semantic actions that can build abstract syntax trees on the fly. This type of functional composition is gaining momentum (there are often questions about it on comp.lang.c++.moderated and comp.std.c++). Thoughts? Anyone? Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net

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[test] Patch for Tru64/CXX
by Markus Schöpflin 15 Jun '05

15 Jun '05

Hello, attached patch solves a problem with the singleton implementation in the test library surfacing on Tru64/CXX. On this compiler, we need an explicit instantiation of the singleton template, otherwise multiple copies of the singleton are created. Ok to apply? Markus Index: utils/trivial_singleton.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/test/utils/trivial_singleton.hpp,v retrieving revision 1.1 diff -u -r1.1 trivial_singleton.hpp --- utils/trivial_singleton.hpp 20 Feb 2005 08:27:08 -0000 1.1 +++ utils/trivial_singleton.hpp 14 Jun 2005 07:26:59 -0000 @@ -45,9 +45,19 @@ type() {} \ /**/ +#if BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042)) + +#define BOOST_TEST_SINGLETON_INST( inst ) \ +template class unit_test::singleton< BOOST_JOIN( inst, _t ) > ; \ +namespace { BOOST_JOIN( inst, _t)& inst = BOOST_JOIN( inst, _t)::instance(); } + +#else + #define BOOST_TEST_SINGLETON_INST( inst ) \ namespace { BOOST_JOIN( inst, _t)& inst = BOOST_JOIN( inst, _t)::instance(); } +#endif + } // namespace boost //____________________________________________________________________________//

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c.l.c++.m thread on need for gc
by Larry Evans 14 Jun '05

14 Jun '05

There's a lively thread on c.l.c++.m about gc. One of the last posts: http://groups-beta.google.com/group/comp.lang.c++.moderated/msg/0cc62e8dfb5… concerns xpressive. Could someone familiar with that library give a response? TIA.

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copy_on_write
by Maksym Motornyy 14 Jun '05

14 Jun '05

Hello All, I know that my idea is trivial but this thing is missing in Boost. In some cases it is useful to have copy-on-write objects. For example, everybody knows that returning std::string from a function is not very efficient (actually that's why in Qt strings are implemented as copy-on-write ones). Consider following code: copy_on_write< std::string > concatenate( const std::string &first, const std::string &second ) { copy_on_write< std::string > result; result->assign( first ); result->append( second ); return result; } // somewhere else std::cout << *concatenate( "Hello,", " world!" ) << std::endl; Here no string copy occurs. One can invent a lot of different applications of copy-on-write techinque (strings, iterators, memory pages). I have an implementation, now let community decide if this can be a part of Boost. Sincerely yours, Maksym Motornyy.

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[Boost-bugs] [ boost-Bugs-1220782 ] Another config correction for Sun C++
by SourceForge.net 14 Jun '05

14 Jun '05

Bugs item #1220782, was opened at 2005-06-14 14:46 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1220782&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stephen Clamage (clamage45) Assigned to: Nobody/Anonymous (nobody) Summary: Another config correction for Sun C++ Initial Comment: Current versions of Sun C++ do not support general expressions of non-type template parameters in instantiations. (Expressions of the form J+n and J-n are supported, where J is an integral template parameter and n is a constant.) We plan to support this feature in the next compiler release. The following correction takes care of 42 of the tests in the BOOST test suite: *** boost/spirit/core/composite/epsilon.hpp.old Tue Jun 14 12:47:56 2005 --- boost/spirit/core/composite/epsilon.hpp Tue Jun 14 11:00:17 2005 *************** *** 59,65 **** CondT cond; }; ! #if BOOST_WORKAROUND(BOOST_MSVC, == 1310) // VC 7.1 template <typename CondT> inline condition_parser<CondT, false> operator~(condition_parser<CondT, true> const& p) --- 59,65 ---- CondT cond; }; ! #if BOOST_WORKAROUND(BOOST_MSVC, == 1310) || BOOST_WORKAROUND(__SUNPRO_CC, <= 0x580) template <typename CondT> inline condition_parser<CondT, false> operator~(condition_parser<CondT, true> const& p) I've attached a complete corrected version of epsion.hpp. Steve Clamage stephen.clamage(a)sun.com ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1220782&group_… ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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How are boost/mpl/aux_/preprocessed files generated?
by Larry Evans 14 Jun '05

14 Jun '05

I see in libs/mpl/preprocessed/pp.py there's: self.output.write( \ '\n%s\n' \ '// Preprocessed version of "%s" header\n' \ '// -- DO NOT modify by hand!\n\n' \ % ( self.copyright, match.group(1) ) ) and I've tried to understand from the rest of the *.py how to do it, but I would be a lot easier with some guidance from the authors. What I need to do is change: vectorX_c< T,C0 > to: vectorX_c< T,T(C0) > for each X=1... This would allow the use of an enumeration for C0. TIA.

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