September 2014 - Boost - lists.preview.boost.org

Re: [boost] [Boost.Config] variadic templates availiable with GCC 5 in C++03 mode
by Lars Gullik Bjønnes 24 Sep '14

24 Sep '14

(resent due to missing membership on boost list) On 23 September 2014 22:43, Lars Gullik Bjønnes <larsbj(a)gullik.org> wrote: > Hi, > > It seems that the checking to define BOOST_NO_CXX11_VARIADIC_TEMPLATES or not > is slightly wrong when __GNUC__ > 4 (in this case __GNUC__ == 5) > > This was tried fixed in [SVN r70019], but it looks like the fix was > wrong for __GNUC__ > 4. > > (git 050da29d47ce43b1dca6bed03d54c40d5e3d315e) > > > This is the current code: > > // Variadic templates compiler: > // http://www.generic-programming.org/~dgregor/cpp/variadic-templates.html > # if defined(__VARIADIC_TEMPLATES) || (__GNUC__ > 4) || ((__GNUC__ == > 4) && \ (__GNUC_MINOR__ >= 4) && defined(__GXX_EXPERIMENTAL_CXX0X__)) > # define BOOST_HAS_VARIADIC_TMPL > # else > # define BOOST_NO_CXX11_VARIADIC_TEMPLATES > # endif > #endif > > > This is my proposed fix: > > diff --git a/functional/boost/boost/config/compiler/gcc.hpp > b/functional/boost/boost/config/compiler/gcc.hpp > index ef6b07e..736e8ba 100644 > --- a/functional/boost/boost/config/compiler/gcc.hpp > +++ b/functional/boost/boost/config/compiler/gcc.hpp > @@ -157,7 +157,7 @@ > > // Variadic templates compiler: > // http://www.generic-programming.org/~dgregor/cpp/variadic-templates.html > -# if defined(__VARIADIC_TEMPLATES) || (__GNUC__ > 4) || ((__GNUC__ > == 4) && (__GNUC_MINOR__ >= 4) && defined(__GXX_EXPERIMENTAL_CXX0X__)) > +# if defined(__VARIADIC_TEMPLATES) || ((__GNUC__ > 4 || (__GNUC__ == > 4 && __GNUC_MINOR__ >= 4)) && defined(__GXX_EXPERIMENTAL_CXX0X__)) > # define BOOST_HAS_VARIADIC_TMPL > # else > # define BOOST_NO_CXX11_VARIADIC_TEMPLATES > > > (I'll post a none-damaged diff if wanted.) > > -- > Lgb -- Lgb

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[iterator] Support other tuple implementations with zip_iterator
by Kohei Takahashi 24 Sep '14

24 Sep '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, Here is my proposal [1] for supporting other tuple implementations (e.g. std::tuple) with zip_iterator, which discussed at the issue [2]. This PR will reimplement zip_iterator as a fusion based one, because current implementation is tightly coupled with Boost.Tuple. Of course, Boost.Tuple should be accepted via Boost.Fusion. [1] https://github.com/boostorg/iterator/pull/2 [2] https://svn.boost.org/trac/boost/ticket/7526 Thanks, Kohei Takahashi -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (MingW32) iQIcBAEBAgAGBQJUIi7FAAoJEGGyPxPRp/zof5IQAMFjfB1q3yhXXEvoXOZGedhn 8S6hCWsar0MA42Wn/PIG1cMxgb4oc9cZFv6KBieDAn38QJu44NYDFhxhRlMPDMrs cgNQDbvYROWzakzUX93DstzSwvUwqIjWg4bFFYbE5cmK1MbmCWZODs5TQFKQDxxO KfrUEsttoMlbklFa5Rw9JdM3bP2NMUlmJZ9M/8/rBhAf/AvgLiSK9f7qXjoWoMaZ DwZKEztQB2ZRL+iwtCeNJU0OSJ3/KCsS45xYKY9tsE25RGWU8vdryKEqt/eeHe/d dfVpMWMLKZ3g7PoLc73ntxX+C0B/Zj96rhqurt3Z6gtWmSiYFxct/0oDqfu9JKCn hG4p+g70m1nW47Kfvc8p3ZiWABvOOghPT9CEyyATh4nMzJTYLwawD00uRUtdATT9 siTIH2AeEHUnUuNHMMdbr7kJMq/6aubt0RFz04TgIZJ0EmrkjbuxfeiemoiZhyeN JNE9ubujqMiAcyeLpCWAbnogLWMgn8duvIKYc0pvFlYIkGWKrAMSd46RaCd47g4x alYh7vlLE8nqdmAwe2is5PfFIw8qzJj1zn+Kj+CFkXouJ9eObiOXTbTdQNPhFplT gAxYLdcmz23goQzAQ9xTMySmuGFzHKZn+uTQ3gpzDABC6zGCXhGA/Hu+JER/KmTY 3Ty2EoDqWdsu/bp9mY+/ =wJsr -----END PGP SIGNATURE-----

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Boost.Hana - Type Classes, data types and categories (tags).
by Vicente J. Botet Escriba 23 Sep '14

23 Sep '14

Hi Louis, There is a lot of very good work on your library. I have some comments in relation on how I have implemented Type Classes in my prototype. About datatype<T>. The library proposes type classes and data types. The name datatype_t<> is confusing as the datatype<T> meta-functions must not return one of the defined data types. I see it much more as a category, which is used to map the data type to a category used as parameter of the instantiation TC::Instance<datatype_t<T>>. In addition, I wonder if the category associated shouldn't depend on the type class we want to map. TC::Instance<category_t<T, TC>> About naming: Haskell doesn't have namespaces and all the functions are at the same scope. Your library makes use of a lot of non-member functions, and so name clashing must be avoided. What about moving all the non-member functions of the Type Class to a specific namespace? E.g. struct Monad { ... }; namespace monad { using namespace applicatives; ... bind() }; The use would need to use the type class namespace explicitly auto x = monad::bind(m, f) or introduce the namespace of the type class using namespace monad; auto x = bind(m, f); Best, Vicente

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CMake module for compile-time benchmarks
by Louis Dionne 22 Sep '14

22 Sep '14

Hi, While working on Hana, I have developped a couple of tools to generate compile-time benchmarks. I have now made this easier to use for anyone who wishes to do the same by writing a CMake module which does the dirty work for you. The module is available at [1]. Basically, you drop this in your CMake tree, install a couple of dependencies and then you can create targets to run the compile-time benchmarks. The gist of it is explained in the module, and you can find a lot of examples in [2]. This is still a work in progress. For example, the module still does not support runtime benchmarking even though the documentation says it does. Also, it only works with Clang and GCC for now. There are probably a ton of glitches and ways to improve it; feel free to send pull requests! Regards, Louis [1]: https://github.com/ldionne/hana/blob/master/cmake/Benchmarks.cmake [2]: https://github.com/ldionne/hana/tree/master/benchmark

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Boost.Hana - Maybe and Either data types design
by Vicente J. Botet Escriba 21 Sep '14

21 Sep '14

Hi Louis, I have some concerns with the design of the Maybe and Either data types (maybe the other data types have the same design, I have not taken a look at). There are somethings that I don't understand, sorry I have not changed yet my mind to then new C++ way. If I want to define a function that takes an Either string int, how can I define it? void f(??? p) {} I see that there is a maybe_detail::maybe<bool,class>, however I don't think this is the data type of Maybe, is it? Anyway, I don't see a either_detail::either<bool, class, class>. I have the impression that I must use always auto with lambdas auto f = [](auto p) {...}; But I don't know what I can put in the body. It is to clear neither how can I declare a variable of type Either string int. I see that I can declare a Left string and a Right int BOOST_HANA_CONSTEXPR_LAMBDA auto left_value = left("x"); BOOST_HANA_CONSTEXPR_LAMBDA auto right_value = right(1); I have the impression that the variables are initialized only once and can not be reassigned,or at least we can not assing a Left value to a variable initialized with a Right value. Is this by design? A last concern related to the applicative lift function. I suspect that it corresponds to the Haskell return function and the more general unit Monad function. As there is a lift function in Haskell, this is a little bit confusing. I have named this function make :) In Haskell, the template parameter is a type constructor. This Monad(Applicative) type constructor should be Either E, not Either. Is the type-constructor feature missing from your design? How wan I create an Either string int with a call to auto x =lift<Either>(123); I would expect something like auto x = lift<Either<string>>(123); In my prototype I have auto x = make<expected<holder, string>>(123); where expected<holder, string> is the Monad type constructor for expected<T, string>. Sorry the argument of expected and Either are in interchanged. The string type is the Error. Best, Vicente

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[GSoC] [Boost.Hana] Formal review request
by Louis Dionne 21 Sep '14

21 Sep '14

Dear Boost, It has been a while since I've given news about my GSoC project, Boost.Hana[1]. Things are going very well and I uploaded the library to the Boost Incubator. I think it is time to push the library forward for review. As the author, I know everything that's left to be done and polished before I can be fully satisfied. Still, I believe the library is worthwhile in its current state as it implements a superset of the functionality found in the Boost.MPL and Boost.Fusion. I also think the library will benefit greatly from a larger user base and more feedback. Here are some caveats: - The library requires a full C++14 compiler, so only Clang 3.5 can compile the unit tests right now. However, compilers will eventually catch up. Also, pushing cutting edge libraries forward might motivate compilers to support C++14 ASAP, which is probably a good thing. - The library is not fully stable yet, so interface changes are to be expected. I don't see this as a problem as long as this is documented, especially since I expect Hana to be used mostly for toying around for at least a while. I could be mistaken. So unless someone thinks the library isn't ready or would get rejected right away in its current state for reason X, I am requesting a formal review for Boost.Hana. Regards, Louis [1]: http://github.com/ldionne/hana

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Re: [boost] proposal a movable_initializer_list
by 何子杰Hzj_jie 19 Sep '14

19 Sep '14

No body interests in it? I trust if the initializer_list is movable, it would be great helpful to construct a class with a set of lambda expressions. And we can use these lambda expressions to define a procedure, and provide a better solution for asynchronous programming. .Hzj_jie ________________________________ From: 何子杰Hzj_jie<mailto:hzj_jie@hotmail.com> Sent: ‎16/‎9/‎2014 10:35 To: boost(a)lists.boost.org<mailto:boost@lists.boost.org> Subject: Re: [boost] proposal a movable_initializer_list sorry, my fault of the mistake of for-range usage, you are correct, I am using iterator in my implementation. The efficiency I am taking care is the difference between copy-construction and move-construction. It will be significant if we are using lambda expression. Surely we still have something else to improve, say, provide the size of the vector at construction. The way using movable_initializer_list in the test case is not typical, indeed I am trying another not related issue. <the order of the move-constructions are not expected, i.e. line 46 will throw errors by g++, but no problem by msvc> Usually if a class A accept movable_initializer_list<T> as the parameter of a constructor, we only need A({T(), T()}), i.e. same as initializer_list. You properly would like to have a look at the event class, which is the typical scenario of movable_initializer_list, at https://github.com/Hzj-jie/osi/blob/master/delegates/event.hpp, with a test at https://github.com/Hzj-jie/osi/blob/master/utt_cases/delegates/event_test.h…. briefly it uses movable_initializer_list to avoid a copy of std::function instances, but can provide a way to call constructor with { } syntax. .Hzj_jie From: Sebastian Redl Sent: ‎Monday‎, ‎September‎ ‎15‎, ‎2014 ‎8‎:‎09‎ ‎PM To: boost(a)lists.boost.org On 15 Sep 2014, at 9:39, 何子杰Hzj_jie <hzj_jie(a)hotmail.com> wrote: > hi, all, > > So I proposal a movable_initializer_list, it accepts two ways to construct, with an initializer_list<T*> or initializer_list<T>, the prototype is, > > The implementation of T* overloads is something like > > movable_initializer_list<std::initializer_list<T*> x) > > { > > for(auto it : x) > > { > > assert((*it) != nullptr); > > v.push_back(std::move(**it)); > > delete *it; > > } > } Should be for (auto p : x) { v.push_back(std::move(*p)); delete p; } because of how for-range works. Seems an incomplete manual change from your published source. However, this is highly problematic because: - There is absolutely no way to make this exception-safe. The intended usage is obviously: SomeType st = { new Foo(123), new Foo(456), new Foo(789) }; But if any constructor here throws, a lot of memory is leaked, and destructors are not called. - If efficiency is your goal, I somehow doubt that an additional dynamic allocation per element for the initial list, then building a vector element by element, is the best way to achieve it. - The interface to this is just horrible. Looking at your test case, there is an absurd amount of boilerplate. Here’s what we really want: SomeType st{ Foo(123), Foo(456), Foo(789) }; Here’s what your thing forces me to do: auto pointers = { new Foo(123), new Foo(456), new Foo(789) }; SomeType st(pointers); // Absolute best case: no ambiguity in overload resolution - actually rather doubtful. If you do it that way, you might as well do it this way: Foo[] foos = [ Foo(123), Foo(456), Foo(789) }; // No dynamic allocation SomeType st(make_move_iterator(begin(foos)), make_move_iterator(end(foos))); More efficient, and you could make helpers that combine the make_move_iterator and begin/end calls to reduce boilerplate. > > While the implementation of T overloads is something like > > moveable_initializer_list<std::initializer_list<T> x) > { > > for(auto it : x) v.push_back(move(*it)); > } Again, that’s not how for-range works. What you want is for (auto&& e : x) v.push_back(std::move(e)); But that doesn’t actually work, because a std::initializer_list never gives you non-const access to its elements. I notice that your test case doesn’t test this constructor. Sebastian _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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Boost incubator milestone
by Robert Ramey 19 Sep '14

19 Sep '14

The boost library incubator (www.blincubator.com) has received it's first Boost quality review for one of its submitted libraries. See the review here: http://rrsd.com/blincubator.com/reviews/?library_post_id=669 Hopefully this will motivate more people to submit their own reviews in advance of some formal review period. BTW - this review of this library (Compute) is very positive. Hopefully this will motivate other potential users to try out the library and make their own review. If the number of reviews reaches 5 I'll ask that the formal review for this library be expedited since, given such a head start, the review should be much simpler than starting from scratch. So I'm encouraging people who want to get the review process on a faster track to submit their own reviews as soon as they can find time. The Incubator has been progressing more slowly than I would hope. But progress is being made. Hopefully, this will continue to the point where it becomes and "overnight" success. Thanks to Denis Demidov for breaking the ice here. Robert Ramey -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-incubator-milestone-tp4667761.html Sent from the Boost - Dev mailing list archive at Nabble.com.

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Re: [boost] TravisCI and Coverall usage policies in Boost
by Marek Kurdej 19 Sep '14

19 Sep '14

Hi, > If we ever get Windows on Travis, I was surprised how good the MSVC > static analyser has become, and we should have a pass with that too. > FYI, there is a CI similar to Travis running MSVC-12.0, see https://ci.appveyor.com/. I've used it for a personal project, you can have a look at a sample configuration file using Boost libraries at https://github.com/mkurdej/bft/blob/develop/appveyor.yml. The only problem, there is only a 30-day free trial... Cheers, Marek Kurdej -- Ph.D. candidate

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Trac spam report
by Joaquín M Lopez Munoz 19 Sep '14

19 Sep '14

https://svn.boost.org/trac/boost/ticket/10502 Thank you Joaquín M López Muñoz Telefónica

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