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Integrate function with arguments using quadrature
by Anirban Pal 21 Aug '20

21 Aug '20

Hello, I'm trying to integrate functions with BOOST quadrature routines. So far they have been extremely impressive accuracy-wise, particularly with multiprecision features. I wish to integrate a function and pass some arguments to it. These arguments can be scalars, matrices, structs or objects. I was wondering if there is an example that explores this. Would I need to use a boost.function? Or would a function pointer work? I currently have an implementation using GSL_functions which explicitly allow the function and parameters to be passed as pointers. I am curious if I can do something similar with boost. Thank you. -- Anirban Pal

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PFR (Precise and Flat Reflection) by Antony Polukhin scheduled for review
by Mateusz Loskot 18 Aug '20

18 Aug '20

Hi, A brief announcement from the review wizards: Formal review of Antony's library has been scheduled to take place between September 28 and October 7, 2020. Details and links available here https://www.boost.org/community/review_schedule.html Best regards, -- Mateusz Loskot, http://mateusz.loskot.net

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help with serialization error
by Lorenzo L 14 Aug '20

14 Aug '20

I'm trying to compile a piece of software called Bagel (a quantum chemistry program) written in C++ and which uses Boost. I get a compilation error, and as I don't know C++ and I've never used boost I'm essentially lost. The author of the program says the problem I'm experiences depends on my boost installation and not on the program itself. I installed boost 1.73.0 (Linux Mint 20, g++ 9.3.0) doing: sudo ./bootstrap.sh --prefix=/usr/local sudo ./b2 install When compiling the program I get the following error: /usr/local/include/boost/serialization/access.hpp:119:11: error: 'class std::unordered_set' has no member named 'serialize' 119 | t.serialize(ar, file_version); | ~~^~~~~~~~~ /usr/local/include/boost/serialization/access.hpp: In instantiation of 'static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_oarchive; T = std::unordered_set]': /usr/local/include/boost/serialization/serialization.hpp:69:22: required from 'void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_oarchive; T = std::unordered_set]' /usr/local/include/boost/serialization/serialization.hpp:128:18: required from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_oarchive; T = std::unordered_set]' /usr/local/include/boost/archive/detail/oserializer.hpp:148:40: required from 'void boost::archive::detail::oserializer::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::binary_oarchive; T = std::unordered_set]' /usr/local/include/boost/archive/detail/oserializer.hpp:101:1: required from 'class boost::archive::detail::oserializer' /usr/local/include/boost/archive/detail/oserializer.hpp:253:13: required from 'static void boost::archive::detail::save_non_pointer_type::save_standard::invoke(Archive&, const T&) [with T = std::unordered_set; Archive = boost::archive::binary_oarchive]' /usr/local/include/boost/archive/detail/oserializer.hpp:308:22: [ skipping 21 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ] ... The following post https://lists.boost.org/boost-users//2014/03/81583.php [1] report on a similar error, but I couldn't understand what I should to solve it. Any advice would be appreciated! Con Tiscali Mobile Smart 30 4G hai minuti illimitati, 100 SMS e 30 Giga in 4G a soli 8,99€ al mese. http://tisca.li/smart30

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[release] Boost 1.74.0
by Marshall Clow 14 Aug '20

14 Aug '20

Release 1.74.0 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 1 new library and numerous enhancements and bug fixes for existing libraries. For details, including download links, see < http://www.boost.org/users/news/version_1.74.0> You can also download directly from: < https://dl.bintray.com/boostorg/release/1.74.0/> 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 Marshall Clow, Michael Caisse, Glen Fernandes

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Difficulty using boost quadrature library
by Anirban Pal 14 Aug '20

14 Aug '20

Hello everyone, I'm new to using boost and I'm trying to use its quadrature routines, specifically the *tanh_sinh* integrator. I'm trying to run the examples here: <goog_14736225> https://www.boost.org/doc/libs/1_66_0/libs/math/doc/html/math_toolkit/doubl… I've been successful using it with the *double* datatype. However, I can't seem to work with the *Real* datatype. When I run the following, I'm successful. tanh_sinh<double> integrator;auto f = [](double x) { return 5*x + 7; };double Q = integrator.integrate(f);Q = integrator.integrate(f, 0.0, 1.1); But when I run the following: auto f = [](Real x) { return log(x)*log(1-x); };Real Q = integrator.integrate(f, (Real) 0, (Real) 1); I get the error: boost_test.cxx: In function ‘int main(int, char**)’: boost_test.cxx:47:15: error: ‘Real’ has not been declared auto f2 = [](Real x) { return log(x)*log(1-x); }; ^~~~ boost_test.cxx:48:2: error: ‘Real’ was not declared in this scope Real Q2 = integrator.integrate(f2, (Real) 0, (Real) 1); I think I need to include the right headers for this to go away. However, I'm not sure what the correct header file is. Thank you for your attention. -- Anirban Pal

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Building Boost With clang-cl.exe?
by Osman Zakir 12 Aug '20

12 Aug '20

I tried to build Boost version 1.73.0 with clang-cl.exe but ran into trouble. I've attached my project-config.jam file to this message for you guys to review, as well as the config.log file which shows the output for the run. The command I ran on the command line when invoking b2 was "b2 --build-type=complete address-model=64 install" But I saw in the output that the address model and architecture wasn't set and it seemed to think I was building for Linux. What went wrong?

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[release] Boost 1.74.0 Release Candidate 2
by Marshall Clow 12 Aug '20

12 Aug '20

The second release candidates for the 1.74.0 release are now available at: <https://dl.bintray.com/boostorg/release/1.74.0/source/> The SHA256 checksums are as follows: 903fd40074de8dc733d2f0b6b0642e43b714653eaeb79289b12161b9567fae97 boost_1_74_0_rc2.7z 83bfc1507731a0906e387fc28b7ef5417d591429e51e788417fe9ff025e116b1 boost_1_74_0_rc2.tar.bz2 afff36d392885120bcac079148c177d1f6f7730ec3d47233aa51b0afa4db94a5 boost_1_74_0_rc2.tar.gz a0e7ce67c52d816708fdeccdd8c9725626ba61254c13c18770498cacd514710a boost_1_74_0_rc2.zip Changes from RC1: * Fix a recently introduced bug in Boost.Asio where it would read from uninitialized memory. As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. -- The Release managers

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[release] Boost 1.74.0 Release Candidate 1
by Marshall Clow 11 Aug '20

11 Aug '20

The first release candidates for the 1.74.0 release are now available at: <https://dl.bintray.com/boostorg/release/1.74.0/source/> The SHA256 checksums are as follows: 9ea3fc8573413f4d4b2c4d448110b6cb0467df834304112e143c7edb09ae71e9 boost_1_74_0_rc1.7z 8b6c429a41f7cac1880594adf8d1d6f0cc1cf19f8980c6b86ac38ef8b3d8a4e0 boost_1_74_0_rc1.tar.bz2 a0a96a9bb3863863e034cafc825b2ddba4249c7d278b76df1277295e7c7afbf2 boost_1_74_0_rc1.tar.gz d4f31cce9d5fbd55691dc2f5fb73380e95aa66426c891ceb3ebdfc6616022842 boost_1_74_0_rc1.zip As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. -- The Release managers

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Boost-1.71.0 upgrade issue
by Tej Kumar 28 Jul '20

28 Jul '20

Hi Team, Hope you guys are doing well. I am trying to upgrade Boost to 1.71.0 version. My code is compiling and building successfully but during test run i see below error. Error seems to be related with boost chrono, even though i have included boost_chrono lib in my makefile. *undefined symbol: _ZN5boost6chrono12steady_clock3nowEv* It will be a great help if you guys can suggest something here. Thanks & Regards, Tej

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[Graph] Unable to get the edge_color in depth_first_search
by Ashish Kumar 27 Jul '20

27 Jul '20

Hello, First of all, I am new to Boost Graph Library. So, there might be a simpler or easier fix to the problem I am facing. I am trying to get the edge color after executing the boost::depth_first_search algorithm on the graph. For that, I created an edge color map and passed it to the function. Also, to log the colors of the edges, I made a visitor class, passed the color of the edge to it, and printed it to the standard output stream, for the tree_edge, back_edge, etc. But, for every edge, the value of color comes out to be 0. So, I am not able to get the color of every edge. A small snippet of how I am calling the depth_first_search function: depth_first_search(graph, visitor(dfs_visitor(root, visited_order, colors, graph)) .edge_color_map(&colors) .root_vertex(root)); The complete code along with the visitor class can be found here: https://gist.github.com/krashish8/5f8d8e613e189857bd2b0fd46dd02b29 Please suggest any possible solution to this problem. Thank you, Ashish Kumar.

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