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

Constant iterator of Single Pass Range
by Jan Hudec 07 May '14

07 May '14

Hello All, The documentation of [Single Pass Range][1] in Boost.Range says that there should be both `iterator` and `const_iterator` associated types and both const and non-const overloads for `begin` and `end`. However if it is really a single-pass range, I don't see a way to implement a `const_iterator` that would work on `const` reference to the range, because the `operator++` of the iterator involves calling a non-const method of the range. For example the `std::istream_iterator::operator++` calls `std::istream::operator>>`, which is non-const and so there is no `const_istream_iterator`. The `istream_range` cheats around this a little, because the range is a wrapper around the stream, not the stream itself. But when I have similarly behaving class that I can make itself be a range, do I really have to work around this using a wrapper, or can the requirement be relaxed in practice? [1]: http://www.boost.org/libs/range/doc/html/range/concepts/single_pass_range.h… -- Jan Hudec <bulb(a)ucw.cz>

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[1.56] Release status?
by Joaquin M Lopez Munoz 06 May '14

06 May '14

Hi, Seems like Boost 1.56 release schedule has been postponed sine die. Is there any blocking issue with the SVN->Github transition that the release depends upon? Thank you, Joaquin M López Muñoz Telefónica

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Help transfer type_index library to the boostorg
by Antony Polukhin 06 May '14

06 May '14

Hi, TypeIndex library was accepted into the Boost. Only a few minor issues remain unfixed so it's time to transfer the library to the boostorg. Unfortunately I have no permissions to do so. Could someone help? -- Best regards, Antony Polukhin

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marking regression test failures as expected
by Andrzej Krzemienski 06 May '14

06 May '14

Hi, I noticed in the regression tests results taht some failing tests are marked as "fail*" in greyish color indicating that the failure is expected along with the explanation why. E.g., http://www.boost.org/development/tests/develop/developer/output/teeks99-03a… Question: how can I indicate that the new failure is expected in the same manner? Regards, &rzej

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Anyone driving from/to Denver?
by Sebastian Redl 06 May '14

06 May '14

Hi, I could only get my bonus miles flights to Denver, not Aspen, so I'm wondering whether anyone else is only flying from/to Denver and driving the rest of the way. I would be interested in sharing that car. Please let me know. Sebastian

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[atomic] Constraints on failure_order?
by Bjorn Reese 05 May '14

05 May '14

According to [1]: "The compare_exchange_weak/compare_exchange_strong variants taking four parameters differ from the three parameter variants in that they allow a different memory ordering constraint to be specified in case the operation fails." According to std::atomic there are some constaints on failure_order. Is this also the case for boost::atomic? [1] http://www.boost.org/doc/html/atomic/interface.html

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[asio] intergrate with message loop how to
by microcai 05 May '14

05 May '14

on platform windows, asio is using IOCP. and IOCP handel got signaled when there is pending events thus we can use MsgWaitForMultipleObjectsEx to wait on both the message queue and the IOCP. when we get a message, call PeekMessage and then DispatchMessage just like the mornal message loop. when we get IOCP singaled, call boost::asio::io_service::pull_one() and we processed the IO events ! by this way, we can have a thread that does both GUI and IO. that's very handy for non-performance critical applications. but, we can't access to the IOCP HANDLE used by asio. that's said. very said. on platform Linux, asio is using epoll. we can get X11 socket, and use asio to monitor that socket, and again calls X11 functions when the socket gets ready. thus, we can intergrate X11 message loop with asio, that's fine. if we are using gtk, it is more convinent to have epoll fd monitored by glib first, and then goes to run asio::io_service::pull_one(). again, that required access to epoll fd used by asio. if asio can expose these internal HANDLE or fd , that'll going to be more powefull !

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[TypeIndex 3.0] Review Manager's Report
by Niall Douglas 04 May '14

04 May '14

Dear Boost, The second round of peer review of proposed Boost.TypeIndex finished on Wed 30th, and here is the review manager's report. My thanks to the five reviewers who took the time and trouble to submit full reviews, plus to everyone else who commented. Votes regarding acceptance: 4 voted to accept TypeIndex into Boost immediately. 1 voted to accept into Boost with conditions. Overall: I recommend immediate acceptance into Boost. Conditions: 1. No one liked the present boost::typeind namespace, almost anything else would be better. I see the namespace has already changed in the develop branch to boost::typeindex, so I think this is already solved. Other common comments: * More than one reviewer mentioned how they liked the docs. * More than one reviewer expressed a desire for an ability to programmatically parse through type specifier strings. I agree with Antony that that is another library which isn't TypeIndex (something Boost.Spirit based which works directly with mangled symbol string representations, representing them as a partial AST - preferably also with a libclang compatible backend - would be great, but that is a totally different library and TypeIndex 3.x provides extensibility for such an additional function). * More than one reviewer sought some method of preventing link if you mix up incompatible uses of TypeIndex and/or with RTTI. Niall -- Currently unemployed and looking for work in Ireland. Work Portfolio: http://careers.stackoverflow.com/nialldouglas/

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when can a trac ticket be considered closed
by Andrzej Krzemienski 04 May '14

04 May '14

Hi Everyone, Sorry for the silly question; at which point in Modular Boost Library workflow should I close a Trac ticket? Is it when I commit the relevant changes to branch master? Regards, &rzej

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[GSoC, MPL11] Community probe
by Louis Dionne 04 May '14

04 May '14

Dear Boost, As a follow-up to [1], I am probing the community to help clarify what are your needs/expectations with respect to a new TMP library. Your involvement is important as it will help direct my work on an eventual successor to the MPL (in consultation with my mentor, Joel Falcou). I expect this to be the first of a series of probes to the community. This one focuses on backward compatibility with the MPL. COMMUNITY PROBE --------------- Please comment on how you would like to see the following points addressed by a new TMP library: (1) Backward compatibility with the MPL. Should it be a swap-in replacement? Is it enough to have an easy way to interoperate between both libraries (think Fusion/MPL interoperation)?. (2) Learning curve for users coming from the MPL. How important is it for you to be able to reuse your knowledge of the MPL (not of TMP, but of the MPL itself)?. Please get involved by posting constructive material. Regards, Louis Dionne PS: As I expect this to be the first of a couple of community-wide probes, is there a preferred way to do these (on the ML or elsewhere)? PPS: If the thread gets very active, I might be slow to answer. I'm spread between this and my finals. [1]: http://article.gmane.org/gmane.comp.lib.boost.devel/250424

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