September 2017 - Boost-announce - lists.stage.boost.cppalliance.org

[boost] [review][Fit] Fit Review Results
by Matt Calabrese via Boost 24 Sep '17

24 Sep '17

Hello everyone, It is my privilege to announce that the Boost library count will once again be incremented as Paul Fultz II's library Fit has been accepted into Boost without conditions. Further details about this decision follow, but before that I'd like to thank Paul for all of the hard work he has put into Fit. Thanks also to everyone who participated in the review, with additional thanks to Vicente who was the review manager for the previous Fit review and who also provided a very detailed review and discussion during this review period. //////////////////////////////////////////////////////////////////////////////// Overview //////////////////////////////////////////////////////////////////////////////// Complete Reviews Considered: Zach Laine: Accept Vicente J. Botet Escriba: Accept John P. Fletcher: Accept Robert Ramey: Accept Jason Rice: Accept Barrett Adair: Accept Lee Clagett: Accept Glen Fernandes: Accept Louis Dionne: Accept Partial Reviews/Discussions Considered: Edward Diener Andrea Bocci Further Discussions (Previous Review): Steven Watanabe Peter Dimov Vladimir Batov Gavin Lambert Rob Stewart Bjorn Reese Manu Sanchez Artyom Beilis //////////////////////////////////////////////////////////////////////////////// Summary //////////////////////////////////////////////////////////////////////////////// Though not all responders reviewed every single aspect of the library, the reviews together adequately covered everything that is necessary for a decision to be made. This decision is made with additional confidence coming from usage of the library by some reviewers going back since during or before the initial review in early 2016. //////////////////////////////////////////////////////////////////////////////// Improvements Since Previous Review //////////////////////////////////////////////////////////////////////////////// This time around we received several more complete reviews than in the previous review period making it easier to be confident in a decision. A couple of notable changes since the 2016 review include: * Improved documentation * Default semantics for "capture" no longer try to determine whether to capture by reference or by value based on the argument being an lvalue or an rvalue (users can still get this via basic_capture) * Improved ADL awareness (internal calls are qualified) Throughout all of the discussions in this second review period, there were no explicit rejections of the library as a whole, though there were several recommendations from participants. A selection of those are listed here, though no changes are strictly required for acceptance: //////////////////////////////////////////////////////////////////////////////// Current Concerns //////////////////////////////////////////////////////////////////////////////// ////////// Design concerns: * Inheritance from user-callables has some potential pitfalls * Generated "infix" operators are "gimmicky" and don't add much value/may cause confusion * Placeholders should live in their own namespace ////////// Documentation concerns (not a complete list): * More examples requested * It is not always clear what files need to be #included for certain facilities in early examples * Better rationale for ConstFunctionObjects * Raw code is not linked from the examples ////////// Suggested name changes from reviewers: * Suggested rename of "partial()" to "partial_apply()" or "curry()" * Suggested rename of "conditional()" to "invoke_first()" or "call_first_of()" * Suggested rename of "apply" to "invoke" * Refer to "Callables" instead as "Invocables" (due to C++17 direction) * Library name "Fit" is not indicative of what it provides //////////////////////////////////////////////////////////////////////////////// Regarding the Author //////////////////////////////////////////////////////////////////////////////// Paul has been active in the Boost community for several years now. He is aware of his responsibilities going forward and I am confident that he will be a reliable maintainer for Fit for the foreseeable future (or whatever the library may be called). //////////////////////////////////////////////////////////////////////////////// Comments on the Name Boost.Fit //////////////////////////////////////////////////////////////////////////////// Note that what I say here is my personal opinion as a member of the community and does not necessarily reflect the opinions of others in the community nor of those in the steering committee. A few reviewers voiced that they would like to see a change of the library name "Fit". While multiple people did suggest this, my opinion is that this should be up to the author to choose whether or not he will change the name before it is added to boost and so I do not think it would be appropriate for us to strictly require or encourage such a change. If the author found the arguments against the name compelling, then he is welcome to change the name, but he should not feel obligated to do so. As a quick note on that, we have several high quality and highly regarded libraries in Boost with names that may not directly tell users what the library is for. Based on their popularity, I do not believe that it has significantly negatively affected their usage or ability to be found. A library name also may be important to an author as a creative outlet and I think it would be... poor form us to force such a change in this particular case and in other cases unless there are very strong reasons (i.e. the name is overly or intentionally misleading or there are legal concerns). I am not convinced that the current name is misleading enough to strictly require a change. As for existing precedent, some examples of libraries already in Boost with names that do not directly tell the user what the library is for include some of Boost's most highly regarded libraries such as Boost.Spirit (including Qi and Karma), Boost.Phoenix, Boost.Wave, Boost.Hana, and the recently accepted Boost.Beast. //////////////////////////////////////////////////////////////////////////////// Thanks again to everyone who participated in this review and in the previous review, and once again, congratulations to Paul on his library's acceptance into Boost. -- -Matt Calabrese _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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[review] The review of Boost.DoubleEnded starts today: September 21 - September 30
by Thorsten Ottosen 21 Sep '17

21 Sep '17

Dear users and members of Boost, I'm proud to announce that the formal review of Benedek Thaler's Boost.DoubleEnded library starts today, September 21, and runs through September 30. This library is the result of Benedek's participation in Google Summer of Code 2015. The library may be downloaded from https://github.com/erenon/double_ended and the documentation may be found here: http://erenon.hu/double_ended/ Anyone is welcome to post a review and/or take part in subsequent discussions (see below for review guidelines). Introduction ------------ This is a container library that provides two containers: A. boost::devector B. boost::batch_deque Both containers provides efficient push_front and push_back operations, hence the name DoubleEnded. The boost::devector class can be seen as an extension of std::vector with efficient support for push_front (so boost::devector provides contiguous storage). In addition, it provides a customizable small buffer optimization like boost::small_vector(*). It furthermore allows for customization of the growth factor such that the user can decide if a reallocation should allocate 1.5 or 2 or whatever more memory. And finally it provides new functionality that does not exist in normal vector implementations -- this functionality allow the class to excel in performance in certain situations like serialization or transfer of data from sources that require a preallocated buffer. The boost::batch_deque is similar to std::deque, but with two important twists. Like std::deque, it provides reference stability when calling push_front/push_back. Reference stability is crucial for programs that uses intrusive containers e.g. using Boost.Intrusive (**). boost::batch_deque has the following main advantages: 1. It allows the user to specify the segment size 2. It allows for external iteration over the segments Taken together, they provide a very efficient and flexible basis for intrusive containers. Access to the segments also increases performance for tasks such as serialization. Finally, boost::batch_deque may be seen as an efficient alternative to std::vector if you want to replace a percent-wise memory overhead with a constant memory overhead and have no need for contiguous storage. Review guidelines ----------------- Please provide in your review whatever information you think is valuable to understand your final choice of ACCEPT or REJECT including Fit as a Boost library. Please be explicit about your decision. Some other questions you might want to consider answering: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With which compiler(s)? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? More information about the Boost Formal Review Process can be found here: http://www.boost.org/community/reviews.html Kind regards Thorsten, Review manager (*) boost::small_vector: https://tinyurl.com/ycslp4ot (**) http://www.boost.org/doc/libs/1_64_0/doc/html/intrusive.html

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[boost] [review][Fit] Review of Fit starts today : September 8 - September 17
by Matt Calabrese via Boost 21 Sep '17

21 Sep '17

A formal review of the Fit library developed by Paul Fultz II starts today, September 8, and runs through September 17. A branch has been made for the review. You can find Fit for review at these links: Source: https://github.com/pfultz2/Fit/tree/boost Docs: http://pfultz2.github.io/Fit/doc/html/doc/ Anyone who is able to provide an assessment of the design, implementation, and/or docs can participate in this review. Usage experience is not absolutely necessary to give feedback, but is highly recommended if you are writing a review. Discussions about aspects of the library are welcome even if a complete review is not presented, though participants are asked to please state whether they would like to accept or reject the library before the deadline of September 17, paying close attention to the questions raised at the end of this email. The success of Boost is partially a result of the quality review process which is conducted by the community. You are part of the Boost community. We will be grateful to receive a review based on whatever level of effort or time you can devote. This is the second time that Fit will go through the review process, with the previous time being in March of 2016. The result of the initial review can be found here: https://lists.boost.org/Archives/boost/2016/04/228770.php In this second review, those who choose to participate should be as rigorous as they'd be in any other review, but are also encouraged to voice whether or not the concerns from March of 2016 were addressed. The following is a brief description of the library from its author: ==================== Fit is a header-only C++11/C++14 library that provides utilities for functions and function objects, which can solve many problems with much simpler constructs than whats traditionally been done with metaprogramming. Fit is: Modern: Fit takes advantages of modern C++11/C++14 features. It support both constexpr initialization and constexpr evaluation of functions. It takes advantage of type deduction, varidiac templates, and perfect forwarding to provide a simple and modern interface. Relevant: Fit provides utilities for functions and does not try to implement a functional language in C++. As such, Fit solves many problems relevant to C++ programmers, including initialization of function objects and lambdas, overloading with ordering, improved return type deduction, and much more. Lightweight: Fit builds simple lightweight abstraction on top of function objects. It does not require subscribing to an entire framework. Just use the parts you need. Fit is divided into three components: Function Adaptors and Decorators: These enhance functions with additional capability. Functions: These return functions that achieve a specific purpose. Utilities: These are general utilities that are useful when defining or using functions. Requirements This requires a C++11 compiler. There are no third-party dependencies. This has been tested on clang 3.5-3.8, gcc 4.6-6.2, and Visual Studio 2015. Gcc 5.1 is not supported at all, however, gcc 5.4 is supported. Contexpr support: Both MSVC and gcc 4.6 have limited constexpr support due to many bugs in the implementation of constexpr. However, constexpr initialization of functions is supported when using the FIT_STATIC_FUNCTION and FIT_STATIC_LAMBDA_FUNCTION constructs. Noexcept support: On older compilers such as gcc 4.6 and gcc 4.7, noexcept is not used due to many bugs in the implementation. Also, most compilers don’t support deducing noexcept with member function pointers. Only newer versions of gcc(4.9 and later) support this. ==================== Please provide in your review whatever information you think is valuable to understand your final choice of ACCEPT or REJECT including Fit as a Boost library. Please be explicit about your decision. Some other questions you might want to consider answering: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With which compiler(s)? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? - Were the concerns from the March 2016 review of Fit addressed? More information about the Boost Formal Review Process can be found here: http://www.boost.org/community/reviews.html Thank you for participating! -- -Matt Calabrese _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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[release] Boost 1.65.1
by Daniel James 07 Sep '17

07 Sep '17

Release 1.65.1 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/history/version_1_65_1.html> You can also download directly from: <https://dl.bintray.com/boostorg/release/1.65.1/> To install this release on your system, see <http://www.boost.org/doc/libs/release/more/getting_started/index.html> Thanks to everyone who participated in this release. Thanks, -- The Boost Release Team Vladimir Prus Rene Rivera Marshall Clow Eric Niebler Daniel James Beman Dawes

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[gsoc] Change in Google Summer of Code admin
by Niall Douglas 07 Sep '17

07 Sep '17

Dear all, Google Summer of Code 2017 has ended with another successful summer of student coding with probably the highest calibre year we've ever seen. After four years as lead admin for Boost Summer of Code, my time has come to an end. I'll be making way for David Bellot, long time mentor at Boost GSoC and maintainer of Boost.uBLAS. Please join me in welcoming David as new lead admin. I'll be staying on as backup admin next summer to help David settle in. My time as Boost Summer of Code admin has certainly been eventful with lots of surprises, ups and downs. The fact these surprises did not turn into crises is due in large part to a few people in particular who went far beyond the call of duty: * Jon Kalb, who went to bat for the students repeatedly in multiple venues and finding tens of thousands of dollars when it was needed. * Boris Schäling, whom I replaced as lead admin and who acted as backup admin for some years, who also managed to arrange tens of thousands of dollars of sponsorship when it was needed most. * Bryce Adelstein Lelbach, for acting as backup admin these past few years. * Andrew Sutton, the lead GSoC admin before Boris, who gave such detailed and useful early advice and materials on how to best navigate the treacherous waters of Google Summer of Code! And finally to all the mentors who so generously volunteered their time, and to the students every single one of whom successfully finished their projects in my time as admin despite problems with sickness, deaths in close family etc. Some of those students have gone on to become mainstays of the C++ conference circuit, famous names in their own right. I'm sure they would have been so without Google Summer of Code, but I'd like to think that it helped bring them to Boost rather than them getting into C++ via elsewhere. Thank you students! Regards, Niall

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[boost] Upcoming Boost.Fit Review (September 8th-17th)
by Matt Calabrese via Boost 05 Sep '17

05 Sep '17

Hi everyone, This coming Friday, September 8th, marks the start of review of the Fit library by Paul Fultz II. Source: https://github.com/pfultz2/Fit Docs: http://fit.readthedocs.org/ This is the second time that the library will go through the review process, with the previous time being in March of 2016. The result of the initial review can be found here: https://lists.boost.org/Archives/boost/2016/04/228770.php In this second review, those who choose to participate should be as rigorous as they'd be in any other review, but are also encouraged to voice whether or not the concerns from March of 2016 were addressed. The following is a brief description of the library from its author: ========== Fit is a header-only C++11/C++14 library that provides utilities for functions and function objects, which can solve many problems with much simpler constructs than whats traditionally been done with metaprogramming. Fit is: - Modern: Fit takes advantages of modern C++11/C++14 features. It support both constexpr initialization and constexpr evaluation of functions. It takes advantage of type deduction, varidiac templates, and perfect forwarding to provide a simple and modern interface. - Relevant: Fit provides utilities for functions and does not try to implement a functional language in C++. As such, Fit solves many problems relevant to C++ programmers, including initialization of function objects and lambdas, overloading with ordering, improved return type deduction, and much more. - Lightweight: Fit builds simple lightweight abstraction on top of function objects. It does not require subscribing to an entire framework. Just use the parts you need. Fit is divided into three components: - Function Adaptors and Decorators: These enhance functions with additional capability. - Functions: These return functions that achieve a specific purpose. - Utilities: These are general utilities that are useful when defining or using functions. ========== Requirements¶ <http://fit.readthedocs.io/en/latest/doc/src/index.html#requirements> This requires a C++11 compiler. There are no third-party dependencies. This has been tested on clang 3.5-3.8, gcc 4.6-6.2, and Visual Studio 2015. Gcc 5.1 is not supported at all, however, gcc 5.4 is supported. Contexpr support¶ <http://fit.readthedocs.io/en/latest/doc/src/index.html#contexpr-support> Both MSVC and gcc 4.6 have limited constexpr support due to many bugs in the implementation of constexpr. However, constexpr initialization of functions is supported when using the FIT_STATIC_FUNCTION <http://fit.readthedocs.io/en/latest/doc/src/FIT_STATIC_FUNCTION> and FIT_STATIC_LAMBDA_FUNCTION <http://fit.readthedocs.io/en/latest/doc/src/FIT_STATIC_LAMBDA_FUNCTION> constructs. Noexcept support¶ <http://fit.readthedocs.io/en/latest/doc/src/index.html#noexcept-support> On older compilers such as gcc 4.6 and gcc 4.7, noexcept is not used due to many bugs in the implementation. Also, most compilers don’t support deducing noexcept with member function pointers. Only newer versions of gcc(4.9 and later) support this. ========== Please take this time to become familiar with the Fit library before the review takes place and feel free to respond in this thread with any additional questions related to the library or its review. Thanks! -- -Matt Calabrese _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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