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[release] Boost.1.86.0
by Marshall Clow 16 Aug '24

16 Aug '24

Release 1.86.0 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. The release contains numerous enhancements and bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/news/version_1.86.0> You can also download directly from: <https://archives.boost.io/release/1.86.0/source/> 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. -- The Boost Release Team Marshall Clow, Glen Fernandes, Ion Ion Gaztañaga

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Boost in CUDA C++
by wickedPlatypus 12 Aug '24

12 Aug '24

Hi everyone: I have been using Boost for a couple of months in Ubuntu but I have moved into Windows 11 where I am using Microsoft VIsual Studio Community. I have been trying to run a simple code using the CUDA nvcc compiler but I am getting the next errors: [cid:09f3ea52-8ad8-4931-a32b-f178768de741] [cid:afc5117d-edf1-4262-be42-601516a4123d] I want to highlight that the code is working properly in C++. I have tested this code with the next configurations: -C++14 or C++17 or C++20 -CUDA ToolKit 12.5 or 12.6 -NVIDIA driver 560.81 -Microsoft VIsual Studio Community 2022 17.10.5 The first error message is related to the use of a compiler prior to C++ 20 but even using C++ 20 the error message is still present. Also, I have attached the code to this email. I really appreciate your expertise in this issue. Thank you so much in advance to all of you!!!

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Program_Options library multitoken() question
by Keeling, William 06 Aug '24

06 Aug '24

Can the number of tokens be limited/validated? I am currently raising exception in notifier() function; if that is the only way, can the option name be known in the notifier function to improve my error message? Thanks William

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undefined type on vs2008 but not vs2010
by Daniel 01 Aug '24

01 Aug '24

Hi, I'm new to C++, working on an old project using the vs2008 toolset. I need to add some networking and so I started with the docs tutorial "An asynchronous TCP daytime server". Boost 1.68 Error C2027 use of undefined type 'boost::_bi::add_cref<Pm,I>' BoostAsio d:\downloads\boost_1_68_0\boost\bind\bind.hpp 2323 namespace _bi {template< class Pm, int I > struct add_cref; ... template<class Pm, class A1> struct dm_result { typedef typename add_cref< Pm, 1 >::type type; <<< 2323 }; Do I need to provide more details? Thanks

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[release] Boost 1.86.0 beta 1 released
by Marshall Clow 26 Jul '24

26 Jul '24

Boost release 1.86.0 beta 1 is now available at: https://boostorg.jfrog.io/artifactory/main/beta/1.86.0.beta1/source/ The SHA256 checksums are: 6c3b6b6b1760090ebd658b764c9006d9579df2a20763ede356e059fe52989277 boost_1_86_0_b1.tar.bz2 cc0e5c0fb54ea8762c2eb9fbfd185cb8ccbe1ad33c218883f9438dbe2f9a795b boost_1_86_0_b1.zip cad677f5b746bd83c68131766554b56ebf40eb7ba94823526b03820db9dbc049 boost_1_86_0_b1.7z 82b59c0ca4d3b8bbf910ffdbbf535ef738fa1d648b8ba6f2608b516a58f89c55 boost_1_86_0_b1.tar.gz Release notes (still need updates): https://www.boost.org/users/history/version_1_86_0.html Please try the beta and report any problems you encounter. Thanks to everyone who contributed to the release. Thanks especially to Sam Darwin for his help with the tools, and figuring out what happend with RC3. -- Boost Release Team

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error: template argument for template type parameter must be a type template< class Allocator = std::allocator< none > >
by Phil Phil 05 Jul '24

05 Jul '24

Greetings, I try to port a c++ project to a new environment with clang++-17, libcxx 17 and std=c++17 for x64 Linux. Also, I switched form boost 1.65 to 1.84. Now I start getting errors in boost itself: /workspace/usr/include/boost/statechart/fifo_worker.hpp:55:45: error: template argument for template type parameter must be a type 55 | template< class Allocator = std::allocator< none > > As far as I know this has to do with deprecation of some variable type in allocator. Any ideas how I might fix this on short notice? Regards

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directory_iterator UNC path
by Lars Sunde 04 Jul '24

04 Jul '24

Hello, Using boost::filesystem::directory_iterator with an UNC path failed with Boost 1.84 and Windows 10. Did some research on this topic and found this bug report from 2022; https://github.com/boostorg/filesystem/issues/245 This issue contain a link to this fix; https://github.com/boostorg/filesystem/commit/9c9d127bddc2b72187c57f4933c49… When looking at boost 1.84 and 1.85 source code I cannot find the fix shown above. Please excuse my ignorance but what is the relationship between https://github.com/boostorg/filesystem and the sw released at https://www.boost.org<https://www.boost.org/> ? Kind regards, Lars [https://opengraph.githubassets.com/d5334b4df3942668241ead9dde0a136ddc1b0979…]<https://github.com/boostorg/filesystem> GitHub - boostorg/filesystem: Boost.org filesystem module<https://github.com/boostorg/filesystem> Boost.org filesystem module. Contribute to boostorg/filesystem development by creating an account on GitHub. github.com

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Re: [Boost-users] Windows binaries, etc
by Michael Powell 30 Jun '24

30 Jun '24

Hello, Been a minute since I last updated my Boost libraries. Curious what the condition of the binaries is, re: VS2022 C++ compiler compatibility, alignment with current lang standards, such as this? https://boost.teeks99.com/bin/1.85.0/ As far as integration goes, I just add include and library paths to my projects, and on from there. Already more or less familiar with that aspect. Cheers, best, Michael W. Powell

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boost-python - call c++ methods within another method with embedded Python ?
by Nicholas Yue 28 Jun '24

28 Jun '24

Hi I am trying to add an ability to allow for the calling of methods within a another method that is running an embedded python but I get an error saying "TypeError: No Python class registered for C++ class MyClass". #include <boost/python.hpp> class MyClass { public: MyClass() = default; void method1(); void method2(); void executePython(); }; #include <iostream> void MyClass::method1() { std::cout << "Method 1 called" << std::endl; } void MyClass::method2() { std::cout << "Method 2 called" << std::endl; } void MyClass::executePython() { try { Py_Initialize(); // Expose the current instance (self) to the embedded Python script boost::python::object main_namespace; main_namespace["self"] = boost::python::ptr(this); // Execute Python code that calls method1 and method2 on self boost::python::exec("self.method1()\nself.method2()", main_namespace); Py_Finalize(); } catch (boost::python::error_already_set&) { PyErr_Print(); } } int main() { MyClass mc; mc.executePython(); return 0; } -- Nicholas Yue https://www.linkedin.com/in/nicholasyue/

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Fwd: [beast] Trying to Integrate Chunked Encoding into server-sync Example
by Max D 29 May '24

29 May '24

Hi everyone, I'm trying to integrate the manual chunked encoding example [0] into the sync-server example [1] and have difficulties understanding a compiler error. I thought I might find some help in this mailing list. Here's my diff to the original example: @@ -151,6 +151,22 @@ handle_request( req.method() != http::verb::head) return send(bad_request("Unknown HTTP-method")); + if (req.target().find("/chunked") == 0) { + std::vector<uint8_t> data; + for (int i = 0; i < 10; i++) { + data.push_back(0x00); + } + net::const_buffer buf {data.data(), 10}; + + send.send_chunk_headers(); + + for (int i = 0; i < 3; i++) { + send.send_chunk(buf); + } + + send.send_last_chunk(); + } + // Request path must be absolute and not contain "..". if( req.target().empty() || req.target()[0] != '/' || @@ -243,6 +259,29 @@ struct send_lambda http::serializer<isRequest, Body, Fields> sr{msg}; http::write(stream_, sr, ec_); } + + void + send_chunk_headers() + { + http::response<http::empty_body> res {http::status::ok, 11}; + res.set(http::field::server, "Beast"); + res.chunked(true); + + http::response_serializer<http::empty_body> sr{res}; + http::write_header(stream_, sr); + } + + void + send_last_chunk() + { + http::write(stream_, http::make_chunk_last()); + } + + void + send_chunk(net::const_buffer buf) const + { + http::write(stream_, http::make_chunk(buf)); + } }; // Handles an HTTP server connection I'm passing a TCP socket as well as the result of http::make_chunk() with a net::const_buffer to http::write() which, if I understand correctly, is the same thing that is done in the example. However, I'm getting the following error when compiling: .../server-sync/src/beast.cpp: In instantiation of ‘void send_lambda<Stream>::send_chunk(boost::asio::const_buffer) const [with Stream = boost::asio::basic_stream_socket<boost::asio::ip::tcp>]’: .../server-sync/src/beast.cpp:164:28: required from ‘void handle_request(boost::beast::string_view, boost::beast::http::request<Body, boost::beast::http::basic_fields<Allocator> >&&, Send&&) [with B ody = boost::beast::http::basic_string_body<char>; Allocator = std::allocator<char>; Send = send_lambda<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >&; boost::beast::string_view = boost::basic_string_view<char, std::char_traits< char> >; boost::beast::http::request<Body, boost::beast::http::basic_fields<Allocator> > = boost::beast::http::message<true, boost::beast::http::basic_string_body<char>, boost::beast::http::basic_fields<std::allocator<char> > >]’ .../server-sync/src/beast.cpp:313:57: required from here .../server-sync/src/beast.cpp:283:20: error: no matching function for call to ‘write(boost::asio::basic_stream_socket<boost::asio::ip::tcp>&, boost::beast::http::chunk_body<boost::asio::const_buffer>) ’ 283 | http::write(stream_, http::make_chunk(buf)); | ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The same thing happens for the send_last_chunk() call. Why isn't the call to write() working? Did I misunderstand something in the example? I'm using boost 1.71 and am compiling with GCC 10.3.0. Let me know if you need any more details. Thanks in advance for any help Max --- [0] https://www.boost.org/doc/libs/1_71_0/libs/beast/doc/html/beast/using_http/… [1] https://www.boost.org/doc/libs/1_71_0/libs/beast/example/http/server/sync/h…

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