August 2010 - Boost - lists.preview.boost.org

[bcp] Bcp namespace rename on 1.44 release beta 1 causes runtime errors on range lib and build tool
by Cliff Green 08 Aug '10

08 Aug '10

John (and others), I just tested a full Boost extract with namespace rename (and namespace alias) on 1.44 release beta 1. After bootstrap building bjam from the distribution, I built bcp and then attempted to extract all of Boost (libs and tools) with namespace rename and alias (this time using "." to extract everything). I'm getting runtime errors from bcp: **** exception(200): Invalid parameter detected by C runtime library I've isolated it down to one library and one tool - the range library, and the build tool. All other libraries and tools individually successfully extract (with namespace rename). I tried doing a Boost root library build (with bjam) after the extract, but missing critical pieces of build is causing problems (which makes sense). I assume this is a high pri (at least the build tools part), so I'll be happy to help in any way. Cliff

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[config] Support for variadic macros
by Edward Diener 07 Aug '10

07 Aug '10

What is the boost macro which can be used to determine whether or not a compiler supports variadic macros ? I looked at the config macros but could not find the necessary macro documented there.

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[proto][1.43] Problem with proto::matches
by Antoine de Maricourt 07 Aug '10

07 Aug '10

Hi Eric, I went into the following error with a grammar using terminals of T[N] (terminal<int[2]> in the example, gcc 4.5.0, boost 1.43): /usr/local/include/boost/proto/matches.hpp:1026:13: error: ambiguous class template instantiation for struct boost::proto::detail::lambda_matches<int [2], boost::proto::wildcardns_::_, -0x00000000000000001l> /usr/local/include/boost/proto/matches.hpp:119:13: error: candidates are: struct boost::proto::detail::lambda_matches<T, boost::proto::wildcardns_::_, -0x00000000000000001l> /usr/local/include/boost/proto/matches.hpp:129:13: error: struct boost::proto::detail::lambda_matches<T [M], U, -0x00000000000000001l> Adding the following specialization in matches.hpp solves it: template<typename T, std::size_t M> struct lambda_matches<T[M], proto::_ BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(-1)> : mpl::true_ {}; Best regards, Antoine

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[config] Configuratiion support for variadic macro
by Edward Diener 07 Aug '10

07 Aug '10

Should not Boost have a configuration macro indicating compilers which have support for variadic macros ?

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[1.44][beta] Patch for missing header in boost/random/subtract_with_carry.hpp
by Denis Arnaud 07 Aug '10

07 Aug '10

Hello, following is a small patch to fix a compilation issue with boost/random/subtract_with_carry.hpp: ------------------------------------------------------------------------------------- --- a/boost/random/subtract_with_carry.hpp +++ b/boost/random/subtract_with_carry.hpp @@ -30,7 +30,7 @@ #include <boost/random/detail/seed.hpp> #include <boost/random/detail/operators.hpp> #include <boost/random/linear_congruential.hpp> - +#include <boost/random/detail/generator_seed_seq.hpp> namespace boost { namespace random { ------------------------------------------------------------------------------------- That issue has been spotted by Fedora packagers in the building of the QuantLib library: https://bugzilla.redhat.com/show_bug.cgi?id=621631 Could someone add that patch to the 1.44 branch? Thanks in advance Best Regards Denis

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[bcp] Enhancements to bcp extract and namespace rename
by Cliff Green 06 Aug '10

06 Aug '10

John, as promised, here's a couple of enhancement requests to bcp, relative to namespace renaming. I know time can be (very) limited, so I'll help in any way I can, or maybe we can see if someone is looking for a relatively small contribution they can make to Boost, in a useful utility. I can file trac tickets, if you'd like (I haven't before, so will need to look at the process). First, a statement of project needs (and I would expect others have similar needs): --- My workgroup provides software libraries (using Boost) to another group (this is within a large aerospace company in the Seattle area) that also uses Boost. Unfortunately the Boost versions can be (and typically are) different. Both sets of software (libraries) are compiled into the same executable. The namespace rename feature of bcp allows multiple versions of Boost to co-exist in the same executable. The one restriction is that for a given translation unit (.cpp file), the same version of Boost must be used. (I know Artyom, I believe, also has a tool that allows multiple versions of Boost even in the same translation unit, but this is not something we need, and I would guess is a corner case for most developers.) Enhancement requests: -- I couldn't find a way to "wildcard" extract and rename all Boost libraries. I ended up performing the extract / rename one-by-one. I suppose I could generate a list of the libraries and compose an invocation of bcp with all libraries explicitly listed (assuming command line buffers won't be exhausted), or write a script to do this, but it seems that it wouldn't be hard for bcp to do it inside the code. -- Related to above, when extracting (and renaming) one-by-one, the same dependent libraries are copied out (and overwritten) over and over. With a "wildcard" (or "full list of libraries") I assume that shared dependent libraries would only be copied once. -- Related to above, if there's a "full copy, rename namespace for all libraries" facility, managing multiple shared dependent libraries becomes a moot point, since all libraries will be copied (dependent or not). And related to this is copying the few remaining non-source files that make up a release. So it comes down to using bcp not to extract a subset of dependent libraries, but instead to perform a full copy of a release, renaming namespaces in source code as appropriate. What do you think? Again, thanks for the quick and excellent help, Cliff

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SVN either down or slowing to a crawl?
by John Maddock 06 Aug '10

06 Aug '10

Anyone any ideas? SVN has been almost impossibly slow the last few days, and today I can't connect at all :-( Cheers, John.

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[Boost] [Random] reproducing numbers generated by R.
by Ronan Trépos 06 Aug '10

06 Aug '10

Dear Boost community, For validity concerns, I'm trying to reproduce pseudo random numbers generated by the sofware R with boost::random library. The R default number generator is the Mersenne-Twister with period 2^19937 -1 . 1. In R I tried : > set.seed(13) > runif(1) 0.7103224 2. With boost I tried : boost::mt19937 rng(13); boost::uniform_01<boost::mt19937> zeroone(rng); std::cout << zeroone() << std::endl; 0.777702 Has someone already experienced that ? Is it possible to reproduce the same numbers ? Maybe the mismatch comes from the fact that generated integers are translated into [0;1).. Thanks, Ronan Trépos -- Trépos Ronan INRA unité BIA, équipe MAD, Toulouse http://carlit.toulouse.inra.fr/wikiz/index.php/Ronan_TREPOS tel : 05 61 28 53 34

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[website] Documentation up again.
by Daniel James 06 Aug '10

06 Aug '10

Hi, The documentation should be up again now, although only for the last two versions of boost. Daniel

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docs website unaccessible
by Andrey Asadchev 06 Aug '10

06 Aug '10

hello I seem to be getting access forbidden for any file in http://www.boost.org/doc/

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