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[asio] [regex] 1.76.0 beta 1 compilation failure
by Scott Determan 18 Mar '21

18 Mar '21

There appears to be a problem compiling a program that includes both asio and regex in 1.76.0 beta 1. The following program fails to compile: ``` #include <boost/asio.hpp> #include <boost/regex.hpp> int main(int argc, char** argv) { return 0; } ``` The error is: ``` /home/swd/projs/common/boost_1_76_0_b1/boost/regex/v5/match_flags.hpp:38:14: error: multiple definition of ‘enum boost::regex_constants::_match_flags’ 38 | typedef enum _match_flags | ^~~~~~~~~~~~ In file included from /home/swd/projs/common/boost_1_76_0_b1/boost/asio/detail/regex_fwd.hpp:21, from /home/swd/projs/common/boost_1_76_0_b1/boost/asio/read_until.hpp:23, from /home/swd/projs/common/boost_1_76_0_b1/boost/asio.hpp:146, from ../src/main.cpp:2: /home/swd/projs/common/boost_1_76_0_b1/boost/regex/v4/match_flags.hpp:38:14: note: previous definition here 38 | typedef enum _match_flags ```

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(GSoC '21) uBlas Project 2/3 Guidance
by Laxman 18 Mar '21

18 Mar '21

Hi, I, Laxman Desai, am interested in ublas Project 2 and 3. I’ve built a few C++ libraries before (for personal use) and I am familiar with C++17, MATLAB, TensorFlow, NumPy and Pandas to a good extent. I am currently learning R. I also have a good mathematical background, especially in Linear Algebra. I have currently completed the Competency Test for uBlas, and would request the mentors: David Bellot, Cem Bassoy or Amit Singh to guide me further for Project 2: creating new matrix and vector types and Project 3: Finalize Dataframe Implementation. Project 2: I dont understand what experimental templates and ublas::experimental::matrix means. I although have a strong feeling that it just refers to the tensor implementation of the same. I haven’t used uBlas tensor_core before, so could a mentor explain further (a basic intuition of the improvement, and the workflow for this project)? I would also appreciate more information on submatrix, and its implementation! To my understanding, it is to solve the problem that C++ doesn’t allow overloading of the colon operator. Project 3: I also am interested in project 3 (Finalising the DataFrames Implementation), and am currently exploring the available features. I have been using Pandas for a while now, and recently learnt R. “Finalize and productionize” seemed a bit vague to me, could I get more information on what all the current implementation is lacking (except for documentation)? I would also like to know if the mentors have a shortlist of features to add in mind? Any feedback on this would be greatly appreciated. Kind Regards, Laxman Desai Mail: desai.laxman2001(a)gmail.com

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SVN/Trac account settings not accessible
by Andrey Semashev 17 Mar '21

17 Mar '21

Hi, It looks like SVN/Trac manager is no longer working. Is there a way to change account password?

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Remove obsolete Coding Guidelines for Integral Constant Expressions
by Nikita Kniazev 17 Mar '21

17 Mar '21

Boost Library Requirements and Guidelines has a page https://www.boost.org/development/int_const_guidelines.html which contains highly outdated information. I think the guideline no longer applies and should be simply removed.

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[GSoC'21] Seeking Further Guidance for Project3:Finalize Dataframe Implementation (Boost.uBlas: Matrix and Tensor Computations)
by Kowndinya Renduchintala 17 Mar '21

17 Mar '21

Hi Community! I am Kowndinya Renduchintala, a Second Year Undergraduate majoring in Computer Science and Engineering at Indian Institute of Technology Bombay. I am completely new to Open Source Software Development. Having worked on C++ extensively for the last two years of my Undergraduate studies, I consider myself a proficient C++ programmer. I also had a great amount of exposure in Math, specifically in Linear Algebra and Calculus. This led me to do more work related to them and I started working in the field Data Science where I have largely used Python’s numpy and pandas libraries, also MATLAB in some cases. I am very much interested in developing equivalent capabilities of above mentioned libraries in C++ too! I have gone through the Project Description on the GSoC’21 Ideas Page, and I am highly delighted to see that “Project:3 Finalize Dataframe Implementation” (in Matrix and Tensor Computation category), matches my interests to a very large extent. I am also ready to spend 40-50 hours per week for the completion of the project, thereby helping in productionizing the code by the end of the GSoC’21. But I have some questions left out in my mind after reading the “Project Description” and the “Competency Test” following it. The description says- “add a collection of free form functions, modern data analysis procedures (as found in R tidyverse, in Python pandas/numpy, and in many other packages)”. 1. Do the mentor(s) have some preconceived “list” of the sort of functions to be implemented, or am I expected to include the details of “my” ideas in the project proposal that I submit to Google starting from Mar29 to Apr13? 2. Is the Competency Test(providing matrix and vector C++17 implementation similar to MATLAB syntax) meant for giving us a taste for how the work in actual project is going to look like? If it is the case, then I am highly interested to work on such things/ similar things for that matter. I request David Bellot(The Potential Mentor as per the Wiki page) or any one else who is involved with the above project to please guide me further. After clarifying above two questions, I can straight away get into business and start the work, try to make a list of deliverables and probably ask more “technical” questions that I have in the code base, in my next mail. Looking forward to collaborate with Boost.uBlas and successfully complete my first Open Source Software Development project at GSoC’21 in my most favourite programming language!!! Regards Kowndinya Renduchintala rharisrikowndinya333(a)gmail.com Sent from [1]Mail for Windows 10 References 1. https://go.microsoft.com/fwlink/?LinkId=550986

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[sort] How does pdq-sort allocated memory?
by Viktor Sehr 17 Mar '21

17 Mar '21

According to the documentation boost::pdq_sort uses Log N additional memory. Assuming this memory is allocated via new, is it possible to pass an allocator, or even better, a pre-reserved std::vector<T> to the algorithm in order to avoid allocation? I could not find anything in the documentation about this. /VIktor

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Confusion regarding projects
by Ameya Chawla 17 Mar '21

17 Mar '21

Respected sir/madam I want to contribute to Boost C++ libraries , but i am confused that do I have to contribute to all the 3 projects mentioned in Boost.uBlas <https://github.com/boostorg/ublas>: Matrix and Tensor Computations or I can contribute to any one of them .and competency test is for project 2 only or for all 3 projects ? https://github.com/CGAL/cgal/wiki/Project-Ideas Thank you

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Confusion regarding projects
by Ameya Chawla 17 Mar '21

17 Mar '21

Respected sir/madam I want to contribute to Boost C++ libraries , but i am confused that do I have to contribute to all the 3 projects mentioned or I can contribute to any one of them .and competency test is for project 2 only or for all 3 projects ? https://github.com/CGAL/cgal/wiki/Project-Ideas Thank you

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[release] Boost 1.76.0 beta 1 released
by Marshall Clow 16 Mar '21

16 Mar '21

Boost release 1.76.0 beta 1 is now available at: <https://dl.bintray.com/boostorg/beta/1.76.0.beta1/source/> The SHA256 checksums are as follows: 39eecd9672e78b95c8e3fdec1430a63788d528a66d3c8799c4639238e5d785bd boost_1_76_0_b1.7z c32edd34f767dd4bb67b86f76ebf58cf76822a5993a9b434c028b2dd08cfeefc boost_1_76_0_b1.zip 3ec1f92fa0a159b7073e39dd88f527a55d1f35e8986a3c560f202a75bdb8d584 boost_1_76_0_b1.tar.gz eb098d6d5352e10b17a3c49d2927ed61f09b6544f7c534627de35dfa2560fe20 boost_1_76_0_b1.tar.bz2 For details of what's in the release, see <https://www.boost.org/users/history/version_1_76_0.html>. Please download the beta, give it a try, and report any problems you encounter. Thanks, -- The Boost Release Team

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Introduction-Tushar Khandelwal
by Tushar k 16 Mar '21

16 Mar '21

Hi, I am Tushar Khandelwal from BITS Pilani 2019 Batch, I have a decent understanding of C++, I have been practicing C++ for the past 2 years, I am proficient in data structures and algorithms, I am new to open source and would love to contribute to this organization. How should I get started?

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