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Runtime code generation
by VIKRAM LODHI 03 Mar '19

03 Mar '19

I am trying to write a grammar based code but can't seems to find starting point. Is there anything I should go through first. Grammar based . All the functions are written in string formats by user and parsed into binary at runtime and are able to use that function.

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[release][multi_index] Permission to merge to master
by Joaquin M López Muñoz 03 Mar '19

03 Mar '19

I'm asking permission to merge the following fairly trivial changes to master: https://github.com/boostorg/multi_index/compare/bbb915bd344463ba767aebe7988… Travis and AppVeyor tests are passing. BTW, the conditions for allowed commits at this release stage ("closed for major changes") are not clear to me. Do I really need to ask for permission if the change (as is this case) is deemed minor? Joaquín M López Muñoz

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Re: [boost] [Boost-testing] Running regression tests for msvc-14.2 (preview)
by Tom Kent 02 Mar '19

02 Mar '19

On Tue, Feb 26, 2019 at 7:13 AM Mateusz Loskot via Boost-Testing < boost-testing(a)lists.boost.org> wrote: > On Tue, 26 Feb 2019 at 14:02, Tom Kent via Boost-Testing > <boost-testing(a)lists.boost.org> wrote: > > I was hoping to start running regression tests for the upcoming Visual > Studio 2019 (toolset 14.2) and got stumped by an issue. > > I've set a user-config.jam: > > using msvc : 14.2 ; > > Is this toolset even supported? > > As I explained in > https://lists.boost.org/Archives/boost/2019/02/245143.php, > I had to 'fake' it as 14.1 in project-config.jam: > > using msvc : 14.1 : "C:\\Program Files (x86)\\Microsoft Visual > > Studio\\2019\\Preview\\VC\\Tools\\MSVC\\14.20.27323\\bin\\HostX64\\x64\\cl.exe" > I was able to get the regression tests to run using this workaround in user-config.jam. Here's what the config_info is: https://www.boost.org/development/tests/develop/developer/output/teeks99-te… I'm disappointed that we can't have general support for future versions of msvc. We don't seem to have this problem with pre-release versions of GCC/Clang. https://www.boost.org/development/tests/develop/developer/output/teeks99-02… Tom

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Gsoc 2019 Boost.GIL project
by fady faragallah 02 Mar '19

02 Mar '19

Hi,I am fady faragallah 4th year student at faculty of computer engineering. I am interested in Boost.GIL and would like to contribute to the project. I have good experience in C++ programming and image processing algorithms and I am currently working on image processing and deep learning projects using convolutional neural networks. I need to know where I can deliver the competency test and how to contact the mentors. Thanks

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Interested in working on Boost.GIL
by AvZ NaV 01 Mar '19

01 Mar '19

Hello, I am Arnav Tiwari, a sophomore year undergraduate student of IIT Kharagpur. I am interested in working on Boost.GIL. I have prior experience in image processing and C++ so I feel I will be able to pick up the project and get to work quickly. I would really appreciate it if someone can point me in the right direction to get started. I hope I'm not spamming the mailing list, apologies if that is the case. -- Regards, Arnav Tiwari

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Re: [boost] [variant2] Need rationale for never-empty guarantee
by Nikita Kniazev 01 Mar '19

01 Mar '19

> This reply actually addresses my question: visitation on boost::variant2 is > faster than on std::variant because it does not have to account for the > valueless state. I would not expect perfomance differences on CPUs with branch predictor or if visitation translated into jump table (variant uses switch for this?). > For example, resizing a std::vector implements the strong guarantee that > state will be restored to before the resize if an exception is thrown in > the middle of the resize. Probably one should use different container type if a data types move/copy can throw. There even a vector implementation that will not copy/move on resize https://www.youtube.com/watch?v=Ke1mJiGO-pU (for CPU with virtual memory).

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[appveyor] basic question
by Raffi Enficiaud 01 Mar '19

01 Mar '19

Hi Boost, Can somebody explain me like I am 5 what I need to do in order to activate Appveyor builds for boost.test? I am not admin of the repository. Thanks! Raffi

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Review request for variant2, review manager wanted
by Peter Dimov 28 Feb '19

28 Feb '19

I'd like to request a formal Boost review for the Variant2 library, https://github.com/pdimov/variant2. Variant2 contains an implementation of a variant<T...> type that is an almost conforming std::variant, except it doesn't require C++17 and supports C++11 and above. It's also never valueless and has a few other extensions. The same library also contains an expected<T, E...> type, which is like the proposed std::expected<T, E>, but supports more than one error type. expected<> is not yet production-ready and has no test suite, but I will finish it if the library is accepted. The documentation for the variant<T...> class is at https://pdimov.github.io/variant2/index.html. If anyone would like to step forward to manage the review, please do.

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Contributing to Boost.Algorithm
by Juho Lauri 28 Feb '19

28 Feb '19

Hello all, I'd be interested in contributing towards Boost.Algorithm - what's the appropriate way forward? Or perhaps this question has already been asked somewhere and I'd appreciate if you could point me to the right place. Thanks

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A Unicode library?
by Can Topal 28 Feb '19

28 Feb '19

Hello everyone, Since I regularly work with Unicode text, I have started to design a Unicode library for handling UTF 8,16 and 32. The current support in C++ is still limited. Mainly I'm trying to implement a STL like support for file reading/writing, I/O operations and memory storage. So a user could read/write and process Unicode text like an ASCII string without knowing how the text is encoded. I thought people might have use for it. Even though libraries like ICU exist, they aren't beginner friendly and I couldn't find one with decent support for I/O. Is there demand for this? And if so do you guys have any suggestions? Thank you. - Onur

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