- Boost - lists.preview.boost.org

Policy about non-compliant standard headers
by Andrey Semashev 21 Sep '13

21 Sep '13

Hi, I was reported an issue with Boost.Log which fails to compile with Sun Pro compiler because it has non-compliant standard C headers. I was wondering if there is a policy or recommendation for dealing with this kind of problems. I know there is Boost.Compatibility [1] created exactly for this problem. There are many places I include C headers in my code, so relying on Boost.Compatibility would be an ideal solution for me so I don't have to cripple my code. However, I see that many libraries deal with missing std::C symbols themselves. Why do that and not leave it to Boost.Compatibility? By that I mean require users to add it in include path of the compiler. There is one more point to consider. The issue with the broken standard headers is a sign of an ancient compiler. And if the compiler vendor by 2011 (when Sun Studio 12.3 was released) doesn't manage to ship conforming 1998 headers, I'd still consider it an ancient compiler. Boost recently removed (removing?) support for ancient compilers. So, should I bother supporting this compiler at all? [1] http://www.boost.org/doc/libs/1_54_0/libs/compatibility/

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Boost::Units - mapping from units object to something else
by david.hagood＠gmail.com 21 Sep '13

21 Sep '13

I'm looking at the Boost::Units classes to help eliminate a family of programming errors, but there is one thing that I'm having difficulty with: I have a collection of objects of my own type that pertains to units - these are of a fixed type, with instances per type of unit. I'd like to somehow be able to map from the units constants that Boost uses (e.g. boost:units:si:watts) into my objects (return the correct instance for "watts"). Obviously, there's going to be some hand coding to make that happen - it is unlikely to be possible to generate that mapping automatically. Ideally, what I'd like to do would be to have something like template <typename Unit> struct MyMapper { static const MyUnitInfo info; }; template <> const MyUnitInfo<boost::units::si::watts>::info(/*ctor parms for my type */); and do things like: MyMapper<boost::units::si::watts>::info to get the appropriate structure. However, since all the various Boost units are in a type hierarchy to express dimensionality, I'm at a loss how to compose a template to allow something like that to happen - it certainly isn't as straightforward as the above, since Boost units instances of varying types, not typenames. Likewise, just defining some form of map: std::map<???,MyUnitInfo> mymap = boost::assign::map_list_of (boost::units::si::watts,MyUnitInfo(/* my parms*/)) (boost::units::si::ohms,MyUnitInfo(...)); won't work as the types for the Boost constants are all different as far as I can see. Is there some base type all the Boost::Units constants extend, such that I could test for that?

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Boost.Mock ?
by Mathieu Champlon 21 Sep '13

21 Sep '13

Hello, Would a library for mock objects be of interest ? The documentation can be found here : http://mat007.users.sourceforge.net/boost_mock/ An archive is also available for download there : http://sourceforge.net/projects/mat007.u/files/boost-mock.zip It's been converted from turtle (http://turtle.sourceforge.net/) which was mentioned on the mailing-list a couple of times in the past. There is a catch in that it needs Boost.Test from the release branch and doesn't compile with the trunk. The changes are minimal though and I can provide a patch if anyone is interested. Would the library be worth a review ? In the meanwhile I would be highly interested in any feedback ! Thank you, MAT.

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Is there any interest in a library for application : Boost.Application, new version: Boost.Application_beta_3a
by Renato Forti 20 Sep '13

20 Sep '13

Hi All, I have a new version of Boost.Application! In this release all requested features that boost users suggested (in boost user group) are addressed, based on release 1 and release 2, including: 1) Provide more "Boost Way" interface 2) Use Boost.Parameter to give flexibility for future extensions. 3) Access and change environment variables. 4) Simple class (shared_library) to allow use of dynamic libs as plug-in (extending application). 5) Wide string support (Windows). 6) Use Boost.System on Error Handling 7) Setup module for windows service installation. To install, download file: https://downloads.sourceforge.net/project/boostapp/Boost.Application_beta_3a .zip?r=https%3A%2F%2Fsourceforge.net%2Fprojects%2Fboostapp%2F&ts=1379614495& use_mirror=master or https://sourceforge.net/projects/boostapp/files/ and copy application to your boost installation folder! You don't need build it, the lib is header only, but have some dependences. The documentation is still pretty bad, but it is the right place for you to start with lib! Please, send your questions, to: re.tf(a)acm.org Thanks -- Renato

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[asio] Compilation failures on mingw
by Andrey Semashev 20 Sep '13

20 Sep '13

Hi, I'm seeing test failures on MinGW [1], which are probably caused by commit 85764 [2]. Could this be fixed? [1] <http://www.boost.org/development/tests/trunk/developer/MinGW-32%20jc-bell-c…> [2] <https://svn.boost.org/trac/boost/changeset/85764>

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[multi_index][intel-linux-14.0.0] Help needed debugging initializer list support
by Joaquin M Lopez Munoz 19 Sep '13

19 Sep '13

Hi, The trunk version of Boost.MultiIndex introduces support for initializer list, which seems to work fine with regression tests except for intel-linux-14.0.0: http://tinyurl.com/pclssoe http://tinyurl.com/nzwzpu6 which spits error messages like this (replaced large chunks of text with *** for clarity): ../libs/multi_index/test/test_modifiers.cpp(230): error: no instance of overloaded function "boost::multi_index::detail::hashed_index<***>::insert [***]" matches the argument list argument types are: ({...}) object type is: employee_set_by_name i1.insert({{4,"Vanessa",20,9236},{5,"Penelope",55,2358}}); At first I thought this is failing because for it to work the compiler should not only support initializer lists but also C++11 unified initialization syntax, but I think this is not the problem because a) intel-linux-14.0.0 does indeed seem to support unified initialization syntax, since BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX is not listed in http://tinyurl.com/ndutn2w . b) the following test code also fails: s.assign({0,1,2,3,4,5}); with s a multi_index_container of ints, and this does not depend on unified initialization syntaxes. The error message here, FWIW, is different than before: ../libs/multi_index/test/test_copy_assignment.cpp(56): internal error: assertion failed: node_has_side_effects: bad node kind (shared/cfe/edgcpfe/il.c, line 20611) The tested code seems simple enough, for instance lines 271 and following of multi_index_container.hpp look like: #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST) multi_index_container( std::initializer_list<Value> list, const ctor_args_list& args_list=ctor_args_list(), const allocator_type& al=allocator_type()) [...] and the ofending assign member function in sequenced_index.hpp is as innocent as: #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST) void assign(std::initializer_list<value_type> list) { assign(list.begin(),list.end()); } #endif Besides, other libs with initializer list support such as Boost.SmartPtr and Boost.Unordered cope fine with this compiler. Clues? Any help much appreciated. Joaquín M López Muñoz Telefónica Digital

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[smart_ptr] extra colon on make_shared variadic template instantiation
by Vicente J. Botet Escriba 19 Sep '13

19 Sep '13

Hi, while instantiating this template, the Intel compiler finds that there is an extra colon when Args is empty. ::new( pv ) T( boost::detail::sp_forward<Arg1>( arg1 ), boost::detail::sp_forward<Args>( args )... ); ^ Is this a bug on the compiler or on Boost.SmartPtr? Best, Vicente template< class T, class Arg1, class... Args > typename boost::detail::sp_if_not_array< T >::type make_shared( Arg1 && arg1, Args && ... args ) { boost::shared_ptr< T > pt( static_cast< T* >( 0 ), BOOST_SP_MSD( T ) ); boost::detail::sp_ms_deleter< T > * pd = static_cast<boost::detail::sp_ms_deleter< T > *>( pt._internal_get_untyped_deleter() ); void * pv = pd->address(); ::new( pv ) T( boost::detail::sp_forward<Arg1>( arg1 ), boost::detail::sp_forward<Args>( args )... ); pd->set_initialized(); T * pt2 = static_cast< T* >( pv ); boost::detail::sp_enable_shared_from_this( &pt, pt2, pt2 ); return boost::shared_ptr< T >( pt, pt2 ); }

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Comparing floating point Alberto Squassabia - original article wanted.
by Paul A. Bristow 19 Sep '13

19 Sep '13

This link to this article http://www.adtmag.com/joop/crarticle.asp?ID=396 seems now dead [4] Alberto Squassabia Comparing Floats: How To Determine if Floating Quantities Are Close Enough Once a Tolerance Has Been Reached <http://www.adtmag.com/joop/crarticle.asp?ID=396> C++ Report March 2000. Referenced in http://www.boost.org/doc/libs/1_54/libs/test/doc/components/test_tools/floa… l Does anyone still have a copy of the original? Thanks Paul --- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow(a)hetp.u-net.com

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[mpl] and_<true_> returns false
by Agustín K-ballo Bergé 19 Sep '13

19 Sep '13

The following snippet fails to compile (tested with 1.54.0 and trunk, several compilers), #include <boost/mpl/and.hpp> #include <boost/mpl/bool.hpp> #include <boost/mpl/or.hpp> int main() { using namespace boost::mpl; static_assert(and_<true_>::value, "U KID?"); //this one fires static_assert(or_<true_>::value, "U KID?"); //this one is ok } This issue actually showed up in a variadic template scenario. Is this a bug? I feel like I'm doing something really wrong... I guess one may not call `and_` with less than two arguments. If that's the case, it would be helpful if it would be impossible to instantiate it with a single argument. Regards, -- Agustín K-ballo Bergé.- http://talesofcpp.fusionfenix.com

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NuGet packages for boost
by Ben Craig 19 Sep '13

19 Sep '13

NuGet is a package manager that has traditionally been focused on .NET, but it has recently added support for C++ libraries. Here is a presentation by the lead developer adding C++ support to NuGet: http://channel9.msdn.com/Events/GoingNative/2013/Find-Build-Share-Use-Using… I would like to see boost packages added to NuGet, and to have these packages be "official" packages. I am a contributor on another project (Thrift) and I would like to be able to produce NuGet packages for Thrift, and I would like that package to have a "magically" working Boost dependency. Sergey Shandar has made some unofficial packages. Blog describing his effort: http://sergey-shandar.blogspot.com/2013/08/boost-on-nugetorg.html Nuget packages he has submitted: https://www.nuget.org/profiles/sergey.shandar/ If someone (perhaps me) authored the boost NuGet package build process, would the person in charge of releasing Boost be willing to publish the NuGet packages that get created? There are going to be plenty of follow up questions if Boost releases are willing to publish NuGet packages, but I figured I would get the big question out of the way first.

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