May 2020 - Boost-users - lists.preview.boost.org

Boost.Numeric.Interval: Please specify rounding control mechanism
by Bastien Commelongue 01 Dec '20

01 Dec '20

Hello, I am building an app for IOS (ARM) and I had this issue while compiling: *Boost.Numeric.Interval: Please specify rounding control mechanism.* C99 version should be used in this case but __USE_ISOC99 is not defined. Modifying the condition with this code (using __cplusplus) fixed the issue: *boost/numeric/interval/hw_rounding.hpp(36)* *#if defined(BOOST_NUMERIC_INTERVAL_NO_HARDWARE) && (defined(__USE_ISOC99) || defined(__MSL__) || (defined __cplusplus && __cplusplus >= 201103L))# include <boost/numeric/interval/detail/c99_rounding_control.hpp>#endif* Let me know if I missed something or if you plan to integrate this modification in a next version. Cheers, Bastien Commelongue

2 1

[review][LEAF] Review of LEAF starts today : May 22 - May 31
by Michael Caisse 02 Jun '20

02 Jun '20

The Boost formal review of Emil Dotchevski's LEAF (Lightweight Error Augmentation Framework) library will take place from May 22 through May 31st. LEAF isn't just another error reporting library in the family of expected-like types. It provides a unique take on error handling which plays into usability, flexibility, and performance. Every software developer must deal with handling errors which makes this review relevant to all. Please participate! I will be grateful to receive a review based on whatever level of effort or time you can devote. LEAF is brought to us by Emil Dotchevski, the author of Boost.Exception. Similar to Boost.Exception, this library allows arbitrary error objects to be returned; however, unlike Boost.Exception it does not require dynamic memory. The library can be used with or without exception handling. The LEAF documentation highlights the following features: * Efficient delivery of arbitrary error objects to the correct error handling scope. * No dynamic memory allocations. * Compatible with std::error_code, errno and any other error code type. * Can be used with or without exception handling. * Support for multi-thread programming. "LEAF is designed with a strong bias towards the common use case where callers of functions which may fail check for success and forward errors up the call chain but do not handle them." LEAF offers a pattern matching facility to specify which errors to handle and how to handle them. Take a look at the 5-minute Introduction. <https://zajo.github.io/leaf/#introduction> You can find the source code to be reviewed here: <https://github.com/zajo/leaf/tree/review> You can find the documentation here: <https://zajo.github.io/leaf/> The documentation includes a tutorial, examples, reference, design rationale, and comparisons to other error handling approaches/libraries. There is a benchmark document also: <https://github.com/zajo/leaf/blob/master/benchmark/benchmark.md> and a whitepaper: <https://github.com/zajo/leaf/blob/master/doc/whitepaper.md> Please provide in your review information you think is valuable to understand your choice to ACCEPT or REJECT including LEAF as a Boost library. Please be explicit about your decision (ACCEPT or REJECT). 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> Thank you for your effort in the Boost community. Happy coding - michael -- Michael Caisse Ciere Consulting ciere.com

3 2

[review][LEAF] Review of LEAF
by Sorin Fetche 01 Jun '20

01 Jun '20

On Fri, May 22, 2020 at 2:37 AM Michael Caisse via Boost <boost(a)lists.boost.org> wrote: > > The Boost formal review of Emil Dotchevski's LEAF (Lightweight Error > Augmentation Framework) library will take place from May 22 through May > 31st. I wholeheartedly recommend ACCEPTing LEAF as a Boost library I base my recommendation on both the qualities of the library itself and the responsiveness and openness for feedback of its author. As a background, more than year ago, I evaluated error handling using LEAF in the context of an in-house support library for implementing C++ RESTful services. I consider the error handling for microservices based architectures very important because it needs to cover two, sometimes competing, requirements: - as debug logs are less than ideal in distributed systems, an error condition should capture and carry with it as much context and debug information as possible as it propagates back across the stack (both in-process and across different processes/services); - the end-user of the system should not just get a dump of meaningless debug information when an error condition occurred (but neither just a generic "internal error occurred" one). And, coming from the experience of using Boost.Exception for an earlier version of such a utility library, LEAF seemed a very good candidate. So, as part of this evaluation, I tried to see how it would fit alongside Boost.Asio and Boost.Beast in building this REST oriented scaffolding. Through the course of this experimentation, LEAF improved its support for being used with Asio style asynchronous operations and multi-threading. It also includes now an example built at that time that showcases a possible way for how this integration can be be achieved. > - What is your evaluation of the design? Excellent as it allows bridging multiple error handling strategies and usage patterns in an efficient way. I view it as a clear successor to Boost.Exception and has very good interoperability with Boost.Outcome. > - What is your evaluation of the implementation? I have not studied it in depth but from what I can tell, as a user of the library, it is very solid. > - What is your evaluation of the documentation? Excellent! > - What is your evaluation of the potential usefulness of the library? It might not cover any possible usage scenario with error reporting and handling being such a generic problem space that often has conflicting requirements, but for sure it covers enough of it to warrant its inclusion in Boost. > - Did you try to use the library? With which compiler(s)? Did you > have any problems? Yes, extensively last year. Less so, recently [*] Tried it with Visual Studio 2019, g++ 7.3 and 8.2, clang 7.0 > - How much effort did you put into your evaluation? A glance? A quick > reading? In-depth study? In depth study and usage about an year ago. Following the changes it has suffered since then (nothing significant from what I can tell). > - Are you knowledgeable about the problem domain? > I have used multiple error handling libraries over time. And, I also had to deal with distributed systems that had an improper or lacking error handling design, something simply slapped on as an afterthought. [*] The part of the project requiring C++ based services and by extension the infrastructure to enable writing them has been postponed as we (the team I'm part of) focused more on the environment where these services would run. I expect we'll resume this work sometime later this year. And at that time we'll start using the LEAF library again. Best regards, Sorin Fetche

4 7

[review][LEAF] Review period ending soon - May 31
by Michael Caisse 30 May '20

30 May '20

I'd like to encourage each of you to review Emil's error handling library. We often focus on design or implementation based reviews, and I encourage those but what I would really like to see are more user based reviews. Grab the library and docs and play with it a bit. What works well? What can be improved? As a reminder, some of LEAF's features include: * arbitrary error types * header-only * no dependencies * use without exceptions * use with exceptions * no dynamic memory alloc You can find the documentation here: <https://zajo.github.io/leaf/> and the library source here: <https://github.com/zajo/leaf/tree/review> Thanks! michael -- Michael Caisse Ciere Consulting ciere.com

5 8

installing boost in mac
by RUIZ PUJADAS, Esmeralda 30 May '20

30 May '20

Hello, I wanted to install the version 1.67 in mac as i have it in windows (the newest version 1.73 is not working for me) but i read that it is not compatible with mac. The version compatible with mac is above 1.69. So i decided to install this one. If I am mistaken let me know. I wanted to ask you if it is normal to get 524 warnings. All the warnings say the same: warning: empty macro arguments are a C99 feature [-Wc99-extensions] I just did it like this FrankGrimes:Desktop user$ cd boost_1_69_0 FrankGrimes:boost_1_69_0 user$ ./bootstrap.sh --prefix=/Users/user/boost FrankGrimes:boost_1_69_0 user$ ./b2 install Thise warnings will have any influence with my code. I am using xcode and I am having errors with boost due to unused parameters in args in filter_parser.hpp functions so i do not know if this error has something to do with it. Thanks

3 2

[Boost.Graph] Custom vertex properties with std::shared_ptr member ?
by Nicholas Yue 26 May '20

26 May '20

Hi, struct CustomVertex { std::string name; std::shared_ptr<AbstractNodeClass> _node; }; typedef boost::adjacency_list < boost::vecS, boost::vecS, boost::bidirectionalS, CustomVertex> Graph; Vertex DGManager::createVertex(const std::string &name, std::shared_ptr<AbstractNodeClass> Ptr) { _activeVertex = boost::add_vertex(CustomVertex{name, nodePtr}, _g); return _activeVertex; } With Visual Studio 2017, the above is fine but with GCC 7.5.0, I get a seg-fault on application exit. Looking at the stack trace, it looks like a problem in the CustomVertex destructor. Is there some restriction as to what types we can use as member variable of Custom Vertex Properties ? Kind regards -- Nicholas Yue Graphics - Arnold, Alembic, RenderMan, OpenGL, HDF5 Custom Dev - C++ porting, OSX, Linux, Windows http://au.linkedin.com/in/nicholasyue https://vimeo.com/channels/naiadtools

1 0

boost build from source code
by Leonid Meyerovich 21 May '20

21 May '20

Hello, bootstrao.sh file on Linux machine create b2 executable (copy it on boost root directory) cd "$pwd" BJAM="$my_dir/tools/build/src/engine/b2" echo "tools/build/src/engine/b2" cp "$BJAM" . Running b2 shows the error ./b2 bash: ./b2: cannot execute binary file: Exec format error Can somebody explain? Thank you, Leonid ________________________________ This message and all attachments are PRIVATE, and contain information that is PROPRIETARY to Intelligent Automation, Inc. You are not authorized to transmit or otherwise disclose this message or any attachments to any third party whatsoever without the express written consent of Intelligent Automation, Inc. If you received this message in error or you are not willing to view this message or any attachments on a confidential basis, please immediately delete this email and any attachments and notify Intelligent Automation, Inc.

3 15

Review Wizard Status Report for May 2020
by Mateusz Loskot 20 May '20

20 May '20

============================================== Review Wizard Status Report for May 2020 ============================================== News ==== List of events that happened since the last report in 2016 is long and includes 13 releases of Boost, 21 libraries accepted and 4 libraries rejected. Details at https://www.boost.org/community/review_schedule.html What happened in 2020: 1. 2020-01: Ronald Garcia retired as a Review Wizard. Thank you Ronald! 2. 2020-02: StaticString accepted 3. 2020-04: Boost 1.73 Released New Libraries: - Nowide from Artyom Beilis, maintained by Alexander Grund - StaticString from Vinnie Falco and Krystian Stasiowski 4. 2020-05: Bimap library needs a maintainer https://lists.boost.org/Archives/boost/2020/05/248940.php Review Schedule Status ====================== The following libraries need a review manager: * JSON - author: Vinnie Falco, Krystian Stasiowski, Peter Dimov The following libraries have review managers, but have not yet been scheduled for review: * none The following libraries have review managers and have been scheduled for review: * LEAF - May 22, 2020 - May 31, 2020; author: Emil Dotchevski; review manager: Michael Caisse * Text - June 11, 2020 - June 20, 2020; author: Zach Laine; review manager: Glen Fernandes The following libraries have been reviewed and await reports from their review managers: * none The following libraries have been accepted to Boost, but have not yet been integrated into Boost Git: * Double-Ended - conditionally accepted in October 2017; author: Benedek Thaler * Parallel Sorting Sub-library - accepted November 2016; author: Francisco José Tapia The following libraries have been accepted and submitted to Boost Git, but have not yet appeared in a release: * STLInterfaces - conditionally accepted December 2019; author: Zach Laine The following libraries have been accepted provisionally to Boost, but have not been submitted for mini-review and full acceptance: * STLInterfaces - conditionally accepted December 2019; author: Zach Laine General Announcements ===================== As always, we need experienced review managers. Please take a look at the list of libraries in need of managers and check out their descriptions. In general review managers are active boost participants, including library contributors, infrastructure contributors, and other mailing list participants with a substantial track record of constructive participation. If you can serve as review manager for any of them, email us at Mateusz Loskot (mateusz at loskot dot net) or John Phillips (johnphillipsithaca at gmail dot com). We are also suffering from a lack of reviewers. While we all understand time pressures and the need to complete paying work, the strength of Boost is based on the detailed and informed reviews submitted by you. If you are interested in reviewing a library but won't have time during the review period, you can always prepare your review ahead of time. No rule says you can only work on a review during the review period. A link to this report will be posted to www.boost.org. If you would like us to make any modifications or additions to this report, please email Mateusz. The review schedule is an unordered list of the libraries awaiting review. As such, any library on the schedule can be reviewed once the developer is ready, a review manager has been secured, and the manager, developer, and wizards agree on a date to schedule the review. Best regards, -- Mateusz Loskot, http://mateusz.loskot.net

1 0

ubuntu cross-compile boost library for ARM
by Leonid Meyerovich 19 May '20

19 May '20

Hello Everyone, I have spent some time trying to build BOOST libraries from source code on Ubuntu machine. BOOST version is boost_1_73_0. I use ARM compiler echo $CC arm-oe-linux-gnueabi-gcc -march=armv7-a -mfloat-abi=hard -mfpu=neon --sysroot=/home/lm/rfnoc/oe/sysroots/armv7ahf-vfp-neon-oe-linux-gnueabi My current directory is boost_1_73_0 1. I have edited user-config.jam file, adding gcc_root = $(CC) ; using gcc : arm : $(gcc_root) This file is located on 'parent' BOOST directory - boost_1_73_0. 2. Run lm@ubuntu:~/boost/boost_1_73_0$ ./bootstrap.sh --prefix=bbb Building Boost.Build engine with toolset gcc... tools/build/src/engine/b2 Detecting Python version... 2.7 Detecting Python root... /home/lm/rfnoc/oe/sysroots/x86_64-oesdk-linux/usr Unicode/ICU support for Boost.Regex?... /usr Backing up existing Boost.Build configuration in project-config.jam.4 Generating Boost.Build configuration in project-config.jam for gcc... Bootstrapping is done. To build, run: ./b2 To generate header files, run: ./b2 headers To adjust configuration, edit 'project-config.jam'. Further information: - Command line help: ./b2 --help - Getting started guide: http://www.boost.org/more/getting_started/unix-variants.html - Boost.Build documentation: http://www.boost.org/build/ 3. So far it looks OK, I run b2 and have got an error lm@ubuntu:~ /boost/boost_1_73_0$ b2 /home/lm/covra-liquidsdr/boost/boost_1_73_0/tools/build/src/tools/features/warnings-feature.jam:27: in load ERROR: rule "[[bbv2.builtin.features.warnings]]`warnings`::" unknown in module "warnings-feature". /home/lm/covra-liquidsdr/boost/boost_1_73_0/tools/build/src/kernel/modules.jam:295: in import /home/lm/covra-liquidsdr/boost/boost_1_73_0/tools/build/src/tools/features/__init_features__.jam:22: in load /home/lm/covra-liquidsdr/boost/boost_1_73_0/tools/build/src/kernel/modules.jam:295: in import /home/lm/covra-liquidsdr/boost/boost_1_73_0/tools/build/src/tools/builtin.jam:16: in load /home/lm/covra-liquidsdr/boost/boost_1_73_0/tools/build/src/kernel/modules.jam:295: in import /home/lm/covra-liquidsdr/boost/boost_1_73_0/tools/build/src/build-system.jam:12: in load /home/lm/covra-liquidsdr/boost/boost_1_73_0/tools/build/src/kernel/modules.jam:295: in import /home/lm/covra-liquidsdr/boost/boost_1_73_0/tools/build/src/kernel/bootstrap.jam:139: in boost-build /home/lm/covra-liquidsdr/boost/boost_1_73_0/boost-build.jam:17: in module scope Could somebody explain what this error means and what I am doing wrong? Thank you, Leonid ________________________________ This message and all attachments are PRIVATE, and contain information that is PROPRIETARY to Intelligent Automation, Inc. You are not authorized to transmit or otherwise disclose this message or any attachments to any third party whatsoever without the express written consent of Intelligent Automation, Inc. If you received this message in error or you are not willing to view this message or any attachments on a confidential basis, please immediately delete this email and any attachments and notify Intelligent Automation, Inc.

1 0

BoostDLL : Multiple plugins in a single *.so/*.dll file
by Nicholas Yue 18 May '20

18 May '20

Hi, I am currently able to load each plugin in a given shared library. i.e. one plugin for each corresponding *.so/*.dll file However, as the number of plugins increases, I am wondering if there is a way to structure my plugins so that it all resides in a single *.so/*.dll file Additionally, how should one create the individual plugins in a single *.so/*.dll to be able to call their static method ? I have not found such examples so I am not sure if I am using the wrong search terms or it is currently not supported by design in BoostDLL. Cheers -- Nicholas Yue Graphics - Arnold, Alembic, RenderMan, OpenGL, HDF5 Custom Dev - C++ porting, OSX, Linux, Windows http://au.linkedin.com/in/nicholasyue https://vimeo.com/channels/naiadtools

3 3