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[build] Could not open a pull request
by Nikita Kniazev 05 Mar '21

05 Mar '21

It seems that forks of boostorg/build switched their parent automatically and I could not find a way to open a PR against boostorg/build. What is happening and how do I proceed?

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boost.log's text_multifile_backend is not performant on windows - perhaps it should be documented?
by Nicholas Neumann 05 Mar '21

05 Mar '21

I recently moved a project to boost.log from a homemade logger. I had something like text_multifile_backend, so finding that as a drop-in replacement was awesome. Unfortunately, the performance when using text_multifile_backend on windows is really bad, because the repeated file close operations (one per log record) are unusually slow on windows. Repeatedly logging a string to the same file via text_multifile_backend results in throughput of about 200 log entries per second. Just to quickly prove it is unique to windows, I made a simple program that just opens, appends a single line, and then closes, an ofstream in a loop. On a high-end windows machine with nvme ssd, 1000 iterations takes 2600ms. On an older linux box with a sata ssd, the same takes 16ms. What do others think about adding a note in the documentation about this performance issue? It's bad enough that I think anyone on windows would want to avoid the backend. It's not the backend's "fault" at all; I could see some options for improving performance of the backend on windows, but they definitely complicate the simplicity of the current approach. (Side note - in googling the issue, other projects have been bitten - notably mercurial on windows - https://gregoryszorc.com/blog/2015/10/22/append-i/o-performance-on-windows/ )

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[quickbook] Broken links generated in locally built docs
by Andrey Semashev 05 Mar '21

05 Mar '21

Hi, When I'm building QuickBook docs locally for Boost.Log, I'm seeing errors like the following in the end: Error: no ID for constraint linkend: "log.design". and so on for basically any section id that is used in the QuickBook [link] tag. In the resulting HTML documentation all such links point to the root directory where the HTML docs are located. Looking at the bin.v2/libs/log/doc/log_doc.xml file, for example, for the log.detailed.sink_frontends.sync is, it looks like <link> tags use the id that is specified in QuickBook: <link linkend="log.detailed.sink_frontends.sync"> but the actual section has a colon in front of the id: <section id=":log.detailed.sink_frontends.sync"> Is this a known issue and is there a workaround? I'm using DocBook XML from the Kubuntu package, which has version 4.5-9, and a freshly built QuickBook from develop. I used to build docs locally fine before, and did not change the configuration since, but I may have upgraded Kubuntu since I last built the docs. Thanks.

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[release] 1.76.0 closes for major changes TOMORROW
by Marshall Clow 04 Mar '21

04 Mar '21

When: Wednesday, Mar 3, 2021 Description: Release closed for major code changes. Still open for serious problem fixes and docs changes without release manager review. Full calendar at: https://www.boost.org/development/ <https://www.boost.org/development/> — Marshall

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Re: [boost] [Describe] Boost.Describe vs Boost.Fusion
by Nikita Kniazev 02 Mar '21

02 Mar '21

> Or have Spirit perform a check: if `describe::members` is found use it, otherwise fall back to Boost.Fusion. Spirit uses Fusion iterator_range internally, it will require to find/write a replacement that will work with both libraries.

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AVL Databases and Boost Serialization in C++
by Benedict NNcNannara 02 Mar '21

02 Mar '21

AVL Databases were invented in C# and Java in 2016. More recently (2022) AVL Databases were invented in C++. They were a port of the C# code back to C++. In fact, the port was of a larger system - The Generic Language. Boost Serialization Library was used to serialize a general datatype t in set<t>. This applies to the C++ Variant of AVL Databases, The Generic Language Compiler uses AVL Databases to store its code. Execution occurs directly out of the code database, thus no loader is required. In fact the multithreaded, monolithic runtime is very fast compared to the C# version which is now obsolete. uuindouus.zip <https://drive.google.com/file/d/1NhEEmfZMf5yGbnsTAHH1N-XAjPCbczAy/view?usp=…>

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1.76 schedule?
by John Maddock 01 Mar '21

01 Mar '21

Just noticed that the calendar has master closed for breaking changes from yesterday... I was hoping to do a Math & Multiprecision release, but they drop C++03 and have some massive restructuring/changes as a result. On the plus side they're better tested than they probably ever have been. So... too late for 1.76 or not? Thanks, John. -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

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feature for C++ standards compliance
by Robert Ramey 28 Feb '21

28 Feb '21

The serialization library is compatible with C++03 (and likely 98). And is tested regularly with C++ compilers with the -std switch set to this mode. The recent changes to the math library have broken about 5 tests in the serialization library. Since this breakage is in a few tests only and not in the library itself, I'd like to suppress these tests when the being tested with a C++03 compiler. I've suppressed tests which are conditional on C++ features which are not supported and this has worked well for my purposes. I'd like to do the same for a couple of tests which are conditional on usage of the math library and standards versions < C++11. Any B2/CMake experts want to help an old guy out?

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New PropertyTree maintainer
by Glen Fernandes 27 Feb '21

27 Feb '21

Richard Hodges has kindly agreed to become the new maintainer of Boost.PropertyTree. Many thanks, Richard. Please update meta/libraries.json accordingly. Glen

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Google Summer of Code follow-up
by Radu Cosma 26 Feb '21

26 Feb '21

Dear all, A couple of weeks ago I wrote an email inquiring about how to approach applying to contribute to your project through the GSoC opportunity. I did not seem to get any responses, is this the right place to ask? If not, could you please point me to a contact person that I can talk to? I am very interesting in contributing to this project and would really like to know how I can help. I am extremely familiar with the entirety of the C++20 standard, besides some final template (and concepts) features that I am still learning about, and would love the challenge of using those skills in the context of contributing to the Boost libraries. Thank you in advance and have a nice day! Kind regards, Radu Cosma

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