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boost::process v1 broken in 1_88_0
by Sebastian Koerner 29 May '25

29 May '25

Hi Boost-Users, I understand that boost process has v2 and v1 is deprecated, but I thought v1 will at least work on for existing stuff. Between 1_87 and 1_88 process v1 stopped working with v1 code. Something changed v1-incompatible with the includes, like: boost::process::child is unknown. error: ‘child’ is not a member of ‘boost::process’ 73 | std::vector<boost::process::child> m_processes; Is this known or easy-to fix?

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[boost] [openmethod] Peer review conclusion
by Дмитрий Архипов 28 May '25

28 May '25

Dear Boost community, the formal review of candidate Boost.OpenMethod has taken place between 28th of April and May 7th. I have received 6 reviews in total. Four of the reviews recommended unconditional, and 1 conditional acceptance. One reviewer recommended to reject the library. The reviews came from: - Joaquin M López Muñoz, - Christian Mazakas, - Ruben Perez, - Yannick Le Goc, - Klemens Morgenstern, - Andrzej Krzemienski. Also, several people have given insightful comments but did not provide a review. I would like to thank all of the people who took their time to write reviews or participate in the discussions. Your effort was very important and valuable. The outcome of the review is that Boost.OpenMethod is ACCEPTED with some CONDITIONS. 1. The convenience header <boost/openmethod.hpp> should be changed to not introduce identifiers to the global namespace. Reviewers suggested several alternatives to that: either moving those global entities into an alternative header, or put them into a dedicated namespace which users could use via using namespace. 2. The library should not choose an arbitrary ambiguous overrider. Virtually all reviewers have expressed strong dislike for this behaviour. The default should be an error. More lax overrider selection may be provided as an option. 3. The library's documentation should be improved in several areas: * The concepts used by the documentation should be explained early on and more thoroughly. * The library should not claim to implement N2216, as it diverges from it significantly. Instead it may remark on being inspired by it. * Better explain potential platform-specific limitations of certain use cases (runtime loading of shared libraries) and error conditions. In addition, I want to discuss several criticisms that have been expressed during the review. One is that essentially the library doesn't solve a problem that is worth solving. That is, you never need an open set of types combined with an open set of operations. I believe that 10 years of library's use should mostly dispel such concerns. I personally have also encountered such a situation in my practice. The second criticism is that the flexibility of the library comes with higher chance of programmer error, as some usual safe guards go out the window. I can attest that in "many types, many operations" situations alternative approaches are comparably error-prone. It seems to me that this is largely inherent to the complexity of the problem. My advice to the author is to highlight dangerous situations, so that potential users can better evaluate if the added flexibility is worth it. Thanks to Jean-Louis Leroy for submitting this library to Boost. And thanks again to the reviewers and everyone who provided feedback, who ultimately made this review possible.

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How to replace get_io_service()/get_io_context()-calls
by Klebsch, Mario 21 May '25

21 May '25

Hello, I have been using boost::asio for about a decade. I was using boost-1_63. I use get_io_service() (e.g. on a socket) to get a reference to the io_context, e.g. to post(…) on that io_context. I have read, that get_io_service() got deprecated and was removed. I now am facing, the challenge to find a replacement for get_io_service(). I found https://stackoverflow.com/a/39447000/6832488 suggesting to use get_executor().context() as a replacement for get_io_service(). And although the reference returned from get_executor().context() points to the same address as my io_context, it does have the wrong type. I cannot do socket.get_executor().context().post(…). I also found https://stackoverflow.com/a/67773642/6832488, suggesting to (C-Style)cast s to (boost::asio::io_context&). > #define GET_IO_SERVICE(s) ((boost::asio::io_context&)(s).get_executor().context()) But trying C++ (more or less) type safe to static_cast< boost::asio::io_context&>(s) fails to compile. I found that I misinterpreted > ((boost::asio::io_context&)(s).get_executor().context()) to cast (s) to ((boost::asio::io_context&). When I use > static_cast<boost::asio::io_service&>(s.get_executor().context()) My code finally compiles. I must admit, that I find the documentation of get_executor() quiet useless. Btw, Boost.org seems to be useless, too. When I try to read https://www.boost.org/doc/libs/1_63_0/doc/html/boost_asio/reference.html, I get > Error 503 first byte timeout. ☹ The documentation of basic_socket::get_io_service() in version 1_40_0 lists its signature as: > boost::asio::io_service & get_io_service(); That is useful, I can go to the documentation of boost::asio::io_service and find the methods usable on the io_service like post(). But for the current boost version 1_88_0, the signature of basic_stream_socket::get_executor() is documented as: > const executor_type & get_executor(); Ok, executor_type is documented as of basic_stream_socket::executor_type > typedef Executor executor_type; Executor is a template parameter. But when I look at ip::tcp::socket, I find: > typedef basic_stream_socket< tcp > socket; But basic_stream_socket is documented as > template< > typename Protocol, > typename Executor> > class basic_stream_socket : > public basic_socket< Protocol, Executor > Where the hell is the 2nd template parameter for basic_stream_socket? There is no default value of Executor, so how does the template instantiation of basic_stream_socket<tcp> compile? How am I supposed to find out, that I can invoke context() on the return value of get_executor()? I am totally screwed up with the documentation of current boost::asio. ☹ I hope, anybody on this mailing list can enlighten me. Many thanks in advance, Mario Klebsch Mario Funktion | R&D Tel: +49 (0) 531 38 701 718 Raum: Braunschweig, E20 Diese E-Mail und die an sie angehängten Dateien sind ausschließlich für Personen oder Institutionen bestimmt, deren Namen oben aufgeführt sind. Sie können Informationen enthalten, die durch das Berufsgeheimnis geschützt sind und deren Weitergabe strengstens untersagt ist. Jede elektronische Nachricht kann geändert werden. ACTIA lehnt jede Verantwortung für diese Nachricht ab. Der Inhalt dieser Nachricht stellt keine Verpflichtung seitens unseres Unternehmens dar. Wenn Sie kein Empfänger sind, weisen wir Sie darauf hin, dass das Lesen, Vervielfältigen oder Verteilen strengstens untersagt ist. Wir bitten Sie daher, uns umgehend über diesen Brief zu informieren und diese Nachricht sowie eventuell beigefügte Unterlagen aus Ihrem Postfach zu löschen. Danke. This e-mail and the files attached to it are intended exclusively for persons or institutions whose names are listed above. They may contain information that is protected by professional secrecy and the disclosure of which is strictly prohibited. Any electronic message can be modified. ACTIA declines all responsibility for this message. The content of this message does not represent a commitment on the part of our company. If you are not a recipient, we would like to point out that reading, copying or distribution is strictly prohibited. We therefore ask you to inform us immediately about this letter and to delete this message and any accompanying documents from your mailbox. Thank you.

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Boost:1.82.0 ASIO changed its behavior
by Nedelin Rusev 21 May '25

21 May '25

Hi, Recently I inherited an old project, which uses boost 1.65.0 and ASIO, for custom implementation of the SCTP protocol. Technically it adapts the existing ASIO TCP for SCTP. Another implementation uses this ASIO-SCTP to asynchronously send and receive data. My task was to make both implementations work with any boost version from 1.65.0 to 1.87.0. I did the necessary changes and the project now compiles and runs, but I face a test deviation with boost versions 1.82.0 and above. The test is more or less simple: - we have pre-generated data - we start a server, which only receives data and stores it in file per connected client - we start multiple clients, each running in its own thread. Each client sends its own data to the server at a random moment - finally we check if the server has received the same data as the clients have sent. With boost versions up to 1.81.0 the test passes OK. But with boost version 1.82.0 we observe wrong order of the data stored by the server. To illustrate it roughly: Client sends: 0,1,2 Server stores: 0,2,1 (0 is OK, Next we should have 1, but we get 2). Note: the real test data is hundreds of bytes long, not single digits. Note: the test seems to have issues, but on the particular machine, the behavior is consistent: test is OK with boost 1.81.0 and NOK with boost 1.82.0 I suspect the problem has something to do with the "on_immediate()" extension, introduced in boost 1.82.0. Somehow it speeds up the client threads execution and changes the order of the sent data. I failed to find any similar problems, reported in internet (git, boost forums, etc) I have enabled BOOST_ASIO_ENABLE_HANDLER_TRACKING and, if I get the log right, client threads are executed faster. I have attached the handler tracking logs for boost versions 1.81.0 and 1.82.0. My question is how to keep the old code behavior (pre 1.82.0) with later versions? Is there any way to disable the "on_immediate()" functionality? Are there any guidelines for using later versions of boost ASIO (1.82.0 and later)? Providing a simplified example test is hard, as the code-base is quite large. I will try to make something up, but this will take time. Thank you!

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Issues with boost executor_work_guard
by João Fernando Silva 22 Apr '25

22 Apr '25

Hello all, We are facing some issues with boost::asio::executor_work_guard. We are spawning some threads which are bound to a boost::asio::io_context and proteced by a boost::asio::executor_work_guard so that they do not exit even if there is no work to be done. However, despite the work_guard still being valid, we see that the threads exit because boost::asio::detail::scheduler::outstanding_work reaches 0. All operations added to the queue are posted asynchronously. The boost version in use is 1.75 (also tested with 1.78 and the behaviour is the same). Could you help us on the following topics so that we can understand what the root cause may be? 1 - We created an implementation to track the number of elements on boost::asio::detail::op_queue, is this implementation valid? uint32_t size() { auto tmp_op = front_; uint32_t size{0}; while (tmp_op != 0) { ++size; tmp_op = op_queue_access::next(tmp_op); } return size; } 2 - Assuming the approach above is correct, we are trying to compare the values of outstanding_work with the returned value of op_queue.size(). However, these values do not seem to correlate, is this to be expected? 3 - Was this issue observed by someone else? If so what were the root causes? Thanks! Kind Regards, João Silva The information in this communication may contain confidential or legally privileged information. It is intended solely for the use of the individual or entity it addresses and others authorized to receive it. If you are not an intended recipient, you are hereby notified that any disclosure, copying, distribution or action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this communication by error, please notify us immediately by responding to this e-mail and then delete it from your system. Critical TechWorks is not liable for the proper and complete transmission of the information in this communication nor for any delay in its receipt This e-mail is environmentally friendly, just like Critical TechWorks, which lives in a paper-free atmosphere. Therefore, please consider the environment before printing it!

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boost.parser parse int or double?
by kila suelika 12 Apr '25

12 Apr '25

``` #include <boost/parser/parser.hpp> #include <iostream> #include <string> #include <variant> namespace bp = boost::parser; auto numeric_parser = bp::int_ | bp::double_; //auto numeric_parser = bp::double_ | bp::int_; void parse_number(const std::string& input) { auto result = bp::parse(input, numeric_parser); if (result) { std::visit([](auto&& arg) { using T = std::decay_t<decltype(arg)>; if constexpr (std::is_same_v<T, int>) std::cout << "Integer: " << arg << std::endl; else if constexpr (std::is_same_v<T, double>) std::cout << "double: " << arg << std::endl; }, *result); } else { std::cout << "Parsing failed:" << " (" << input << ")" << std::endl; } } int main() { parse_number("24"); parse_number("24.3"); return 0; } ``` Above code failed to parse "24.3" which makes me confused. First int should failed but why it didn't match double? If use ``` auto numeric_parser = bp::double_ | bp::int_; ``` then all number parsed to double.

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[release] Boost 1.88.0
by Marshall Clow 11 Apr '25

11 Apr '25

Release 1.88.0 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 two new libraries: * Hash2: An extensible hashing framework, from Peter Dimov and Christian Mazakas. * MQTT5: MQTT5 client library built on top of Boost.Asio, from Ivica Siladić, Bruno Iljazović, and Korina Šimičević. as well as numerous enhancements and bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/news/version_1.88.0> You can also download directly from: <https://archives.boost.io/release/1.88.0/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] [OpenMethod] Boost.OpenMethod review scheduled
by Дмитрий Архипов 11 Apr '25

11 Apr '25

The review for the proposed Boost.OpenMethod library by Jean-Louis Leroy is scheduled to take place from April 28 to May 07. OpenMethods solve the Expression Problem by making it possible to define free virtual functions, i.e. virtual functions that exist outside of a class The library repository is here: https://github.com/jll63/Boost.OpenMethod. The documentation is here: https://jll63.github.io/Boost.OpenMethod.

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Re: [Boost-users] JSON Schema support in C++ with boost::json?
by Alex 08 Apr '25

08 Apr '25

> 3. Generate validation code that can emit informative messages about failed validation. Valijson ( https://github.com/tristanpenman/valijson ) apparently supports Boost.Json for schema validation, although I haven't used it personally. Most C++ implementations of schema validation don't support a lot of the newer JSON schema versions. You could take a look at some of the C++ tools at https://json-schema.org/tools?query=&sortBy=name&sortOrder=ascending&groupB… Regards, Alex Simpson

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JSON Schema support in C++ with boost::json?
by Nigel Stewart 07 Apr '25

07 Apr '25

Hello all, There are a couple of things I'd like to do with JSON Schema in C++, which are similar to protobuf, but JSON-centric. 1. Generate a C++17 struct from a JSON Schema, names, types, optionality, nested data, arrays. 2. Generate C++17 code for serialising to/from the natve C++17 struct. 3. Generate validation code that can emit informative messages about failed validation. Seems to me this problem isn't specific to our application stack. Essentially we want to pass state between NodeJS and core C++ modules and have those interfaces evolve over time in a maintainable way. What's out there? - Nigel Stewart

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Passing -D options with b2 to ASIO when compiling with mingw64 ucrt64?
by Joost Kraaijeveld 25 Mar '25

25 Mar '25

Hi, I try to compile Boost with MingW64 with ucrt64. I get warnings saying I should define _WIN32_WINNT with 0x0601 or higher and an error saying I must define USE_W32_SOCKETS. Is it possible to pass these on a command line to b2 or otherwise, without interfering with Boost's source? TIA -- Groeten, Joost

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Re: [Boost-users] Boost-users Digest, Vol 5755, Issue 1
by Label 18 Mar '25

18 Mar '25

Hello, > Date: Mon, 17 Mar 2025 21:02:09 +0100 > From: Joost Kraaijeveld <J.Kraaijeveld(a)Askesis.nl> > To: boost-users(a)lists.boost.org > Subject: [Boost-users] Passing -D options with b2 to ASIO when > compiling with mingw64 ucrt64? > Message-ID: > <dc4a6232934d0d77af53a3054afddbc5b22a8bc1.camel(a)Askesis.nl> > Content-Type: text/plain; charset="UTF-8" > > Hi, > > I try to compile Boost with MingW64 with ucrt64. I get warnings saying > I should define _WIN32_WINNT with 0x0601 or higher and an error saying > I must define USE_W32_SOCKETS. > > Is it possible to pass these on a command line to b2 or otherwise, > without interfering with Boost's source? > > TIA > you can append the following definitions to the b2 command line: b2 ... define=_WIN32_WINNT=0x0A00 define=BOOST_USE_WINAPI_VERSION=0x0A00 I do not know whether USE_W32_SOCKETS needs only be defined or wants a special value, you can try define=USE_W32_SOCKETS or define=USE_W32_SOCKETS=1 -- __________________________________ Freundliche Grüße * Best regards * Met vriendelijke groeten * Meilleures salutations * Atentamente * Saludos Holger Gerth EB-Soft GmbH Neckargartacher Strasse 114 74080 Heilbronn Germany Tel: +49 7131-94660 Fax: +49 7131-10990 E-Mail: holger.gerth(a)eb-soft.de Web: https://www.ebsoft.de Amtsgericht-Registergericht-Stuttgart HRB 102882 Geschäftsführerin: Hannelore Sigler

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release] Boost 1.88.0 beta 1 released
by Marshall Clow 16 Mar '25

16 Mar '25

Boost release 1.88.0 beta 1 is now available at: https://archives.boost.io/beta/1.88.0.beta1/source/ The SHA256 checksums are: bc4948bc664fde0c2142badae2679a42124b464dc58019250afe0ef57fd7763e boost_1_88_0_rc1.zip 3c334a9a743b68a35452b0223be8932fb39f26a6938382f9b9e625c4df99602c boost_1_88_0_rc1.tar.gz 9e42c0611500151d795d66a07ef0a21036c02d24678e2e887caf6d97fcbc25ca boost_1_88_0_rc1.tar.bz2 7faf60c4cb12ee90270e41716cf3735a8739016d7346983ce9f5e899e510b26d boost_1_88_0_rc1.7z Release notes (still need updates): https://www.boost.org/users/history/version_1_88_0.html Please try the beta and report any problems you encounter. Thanks to everyone who contributed to the release. -- Boost Release Team

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boost::json question
by Keeling, William 12 Feb '25

12 Feb '25

json::value RCamCfg::GetCfgValue(const std::string& key) { try {return config_.at_pointer(key);} catch(...) { json::value x; return x;} } bool RCamCfg::SetCfgValue(const std::string& key, const json::value& val) { try {config_.set_at_pointer(key, val);} catch(...) {return false;} return {true}; } The first function compiles and runs but the second fails to compile with the following: error: 'class boost::json::value' has no member named 'set_at_pointer'; did you mean 'at_pointer'? config_is defined as "json::value config_;" Any ideas what I am doing wrong? Thanks William Keeling

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Newbie - Using Boost ASIO and Boost Thread from CMake based project
by Russell Haley 11 Feb '25

11 Feb '25

Hello, I am implementing a serial port protocol in a Linux based library. We build boost ourselves (1.86.0) for inclusion in thrift so I am trying to use as much as I can just from the Boost libraries to gain some experience with them. My serial port driver is using the serial_port class from Boost ASIO. It's super cool and working well. To include Boost ASIO in my CMake target, all I have done is this: cmake_minimum_required(VERSION 3.30) set(CMAKE_CXX_STANDARD 20) set(BOOST_ROOT "${PROJECT_SOURCE_DIR}/../dataman_service/boost-install-x86_64-Debug/") find_package(Boost CONFIG) #This is an alternate use? #find_package(Boost NO_MODULE) add_library(L2PUtility L2Packet.cpp L1Transport.cpp crc1021.cpp) target_include_directories(L2PUtility PUBLIC ${CMAKE_SOURCE_DIR} ${BOOST_ROOT}/include) Note there is no target_link_libraries, but ASIO works. I thought that was because it's an HPP/Header only implementation? Since I need to add some threading to the project, I thought I would use the boost_thread library. Examples online show the inclusion of boost/thread.hpp, so I assumed it is another header only implementation and no link library is needed but I am getting a linking error: [2/4] Linking CXX executable L2PSecondary FAILED: L2PSecondary : && /usr/bin/c++ -g CMakeFiles/L2PSecondary.dir/main.cpp.o -o L2PSecondary libL2PUtility.a && : /usr/bin/ld: libL2PUtility.a(L1Transport.cpp.o): warning: relocation against `_ZTVN5boost6detail16thread_data_baseE' in read-only section `.text._ZN5boost6detail16thread_data_baseC2Ev[_ZN5boost6detail16thread_data_baseC5Ev]' /usr/bin/ld: libL2PUtility.a(L1Transport.cpp.o): in function `L1Transport::start_detached()': /home/rhaley/tuleap/BoostAsioL2p/L1Transport.cpp:440:(.text+0x1b32): undefined reference to `boost::thread::detach()' /usr/bin/ld: libL2PUtility.a(L1Transport.cpp.o): in function `boost::detail::thread_data_base::thread_data_base()': /home/rhaley/tuleap/BoostAsioL2p/../stroma_dataman_service/boost-install-x86_64-Debug/include/boost/thread/pthread/thread_data.hpp:162:(.text._ZN5boost6detail16thread_data_baseC2Ev[_ZN5boost6detail16thread_data_baseC5Ev]+0x24): undefined reference to `vtable for boost::detail::thread_data_base' /usr/bin/ld: libL2PUtility.a(L1Transport.cpp.o): in function `boost::thread::start_thread()': /home/rhaley/tuleap/BoostAsioL2p/../stroma_dataman_service/boost-install-x86_64-Debug/include/boost/thread/detail/thread.hpp:182:(.text._ZN5boost6thread12start_threadEv[_ZN5boost6thread12start_threadEv]+0x28): undefined reference to `boost::thread::start_thread_noexcept()' /usr/bin/ld: libL2PUtility.a(L1Transport.cpp.o): in function `boost::thread::~thread()': /home/rhaley/tuleap/BoostAsioL2p/../stroma_dataman_service/boost-install-x86_64-Debug/include/boost/thread/detail/thread.hpp:257:(.text._ZN5boost6threadD2Ev[_ZN5boost6threadD5Ev]+0x18): undefined reference to `boost::thread::detach()' /usr/bin/ld: libL2PUtility.a(L1Transport.cpp.o): in function `boost::thread::get_id() const': /home/rhaley/tuleap/BoostAsioL2p/../stroma_dataman_service/boost-install-x86_64-Debug/include/boost/thread/detail/thread.hpp:738:(.text._ZNK5boost6thread6get_idEv[_ZNK5boost6thread6get_idEv]+0x27): undefined reference to `boost::thread::native_handle()' /usr/bin/ld: libL2PUtility.a(L1Transport.cpp.o): in function `boost::thread::join()': /home/rhaley/tuleap/BoostAsioL2p/../stroma_dataman_service/boost-install-x86_64-Debug/include/boost/thread/detail/thread.hpp:762:(.text._ZN5boost6thread4joinEv[_ZN5boost6thread4joinEv]+0x90): undefined reference to `boost::thread::join_noexcept()' /usr/bin/ld: libL2PUtility.a(L1Transport.cpp.o): in function `boost::detail::thread_data<boost::_bi::bind_t<void, boost::_mfi::mf<void (L1Transport::*)(), void, L1Transport>, boost::_bi::list<boost::_bi::value<L1Transport*> > > >::~thread_data()': /home/rhaley/tuleap/BoostAsioL2p/../stroma_dataman_service/boost-install-x86_64-Debug/include/boost/thread/detail/thread.hpp:94:(.text._ZN5boost6detail11thread_dataINS_3_bi6bind_tIvNS_4_mfi2mfIM11L1TransportFvvEvS6_JEEENS2_4listIJNS2_5valueIPS6_EEEEEEEED2Ev[_ZN5boost6detail11thread_dataINS_3_bi6bind_tIvNS_4_mfi2mfIM11L1TransportFvvEvS6_JEEENS2_4listIJNS2_5valueIPS6_EEEEEEEED5Ev]+0x26): undefined reference to `boost::detail::thread_data_base::~thread_data_base()' /usr/bin/ld: libL2PUtility.a(L1Transport.cpp.o):(.data.rel.ro._ZTIN5boost6detail11thread_dataINS_3_bi6bind_tIvNS_4_mfi2mfIM11L1TransportFvvEvS6_JEEENS2_4listIJNS2_5valueIPS6_EEEEEEEEE[_ZTIN5boost6detail11thread_dataINS_3_bi6bind_tIvNS_4_mfi2mfIM11L1TransportFvvEvS6_JEEENS2_4listIJNS2_5valueIPS6_EEEEEEEEE]+0x10): undefined reference to `typeinfo for boost::detail::thread_data_base' /usr/bin/ld: warning: creating DT_TEXTREL in a PIE collect2: error: ld returned 1 exit status I tried adding a target_link_library: target_link_libraries(L2PUtility PUBLIC boost_thread) To no avail. I now get a missing library in the EXECUTABLE, not in the library that actually includes boost_thread! Does that mean it found it for the L2Utility library? (so confused...) Here is my executable target: add_executable(L2PSecondary main.cpp) target_include_directories(L2PSecondary PRIVATE ${CMAKE_SOURCE_DIR} ${BOOST_ROOT}/include) target_link_libraries(L2PSecondary PRIVATE L2PUtility) And here is the linking error: [1/2] Linking CXX executable L2PSecondary FAILED: L2PSecondary : && /usr/bin/c++ -g CMakeFiles/L2PSecondary.dir/main.cpp.o -o L2PSecondary libL2PUtility.a -lboost_thread && : /usr/bin/ld: cannot find -lboost_thread: No such file or directory collect2: error: ld returned 1 exit status ninja: build stopped: subcommand failed. I confirmed that my boost installation has the library libboost_tread.a. rhaley@linuxdev2:~/tuleap/dataman_service/boost-install-x86_64-Debug$ find . -iname "*thread*.a" ./lib/libboost_thread.a Adding link libraries to the executable targets doesn't fix anything. Can anyone point out what I am doing wrong? Thanks in advance, Russ

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special character handling problem
by budhirajakush7＠gmail.com 30 Jan '25

30 Jan '25

hi everyone i have a problem while passing flag with a space it gets break this is my jamroot snippet my_var = "Nov 30 2024" ; my_var2 = $(PVK_ACCESSDATE_LONG) ; ECHO "$(my_var2)" ; ECHO "$(my_var)" ; if $(PROTOCOL) = common { c_flags = $(CXXFLAGS) ; c_flags += -DPVK_ACCESSDATE_LONG="\"\\\"$(my_var2)\\\"\"" ; c_flags += -DPVK_ACCESSDATE_LONG="\"\\\$(my_var)\\\"\"" ; } both my_var and my_var2 are echoing the same thing but when passing to flags they get break here is the log Nov 30 2024 Nov 30 2024 c_flags: -DPVK_VTL_VERSION="\"24.2\"" c_flags: -DPVK_ACCESSDATE_LONG="\"Nov\"" c_flags: -DPVK_ACCESSDATE_LONG="\"30\"" c_flags: -DPVK_ACCESSDATE_LONG="\"2024\"" c_flags: -DPVK_ACCESSDATE_LONG="\Nov 30 2024\"" c_flags: -DPVK_BASE_VERSION="\"24.2\"" c_flags: Someone please help

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"error: Unable to find file or target named" when using BCP to change Boost namespace
by Nicholas Williams 17 Jan '25

17 Jan '25

Background: My organization uses Boost internally for one of its software products, which is itself a C++ library. Users of our library also often use Boost. As such, we must compile our Boost in a different namespace so that the Boost symbols loaded when our library loads do not interfere with whatever different-version Boost symbols our users might load. Historically, another member of the team has been responsible for building new versions of Boost, but now it's me. I am doing this the same way our code/documentation has previously done it, but it is no longer working, and the errors I'm receiving are not familiar to the team member who was previously responsible for this. The last time we built a new Boost version was 1.80.0. I am now doing it with 1.87.0. The example: Further below, I include a lot of information and build commands, but that might not be useful to you. To help, I have created a minimal reproduction program for reproducing the error. You can clone and use it here: https://github.com/beamerblvd/unable-find-target-with-boost-bcp The good: With minimal effort and using our existing tools and configurations, I was easily able to bootstrap `b2` and then run `b2` to build stock Boost with the normal `boost` namespace. All of that worked perfectly and without error. The bad: When I went to do the same thing but with our custom namespace (via bcp), things fell apart. Our existing tooling copies the untouched 1.87.0 source tree into {dir}/_src. {dir}/user-config.jam is configured as follows: ``` constant BOOST_VERSION : mybranchname-1.87.0.a ; constant MY_PLATFORM : macos15-clang16-arm-d ; constant MY_LABEL : MYextralLabel ; constant BOOST_USER_CONFIG : <my_boost/config/user.hpp> ; using clang : 16 : clang++ : <cxxflags>-fvisibility=hidden <cxxflags>-fvisibility-inlines-hidden ; ``` Within {dir}/_src, I call `bootstrap.sh` and then build `bcp` with: bc -sBOOST_ROOT={dir}/_src \ --boost-build=tools/build/src \ cxxstd=20 \ -d \ 2 \ -j \ 2 \ -q \ --prefix={dir}/bcp \ --build-dir={dir}/bcp \ --stagedir={dir}/bcp/stage \ --user-config={dir}/user-config.jam \ --layout=system \ toolset=clang-darwin \ threading=multi \ link=shared \ architecture=arm \ instruction-set=nocona \ address-model=64 \ --without-python \ --disable-icu \ variant=release tools/bcp That takes a few minutes to complete and does so without error. Once `bcp` is built, I run it with: mkdir {dir}/_dst && \ {dir}/bcp/bin/bcp --boost={dir}/_src --namespace=boost_MYextralLabel --namespace-alias Jamroot boost boost-build.jam boostcpp.jam bootstrap.bat bootstrap.sh build status tools [insert_name_of_every_dir_in_libs] {dir}/_dst That takes a few minutes to complete and does so without error. The contents of {dir}/_dst look as I would expect them to look, with diffs against {dir}/_src reflecting the change in namespace. Once complete, I cd into {dir}/_dst, re-bootstrap, and run `b2` to compile the modified Boost: b2 -sBOOST_ROOT={dir}/_dst \ --boost-build=tools/build/src \ cxxstd=20 \ -d \ 2 \ -j \ 2 \ -q \ --prefix={dir} \ --build-dir={dir}/shobj \ --stagedir={dir}/stage \ --user-config={dir}/user-config.jam \ --layout=system \ toolset=clang-darwin \ threading=multi \ link=shared \ architecture=arm \ instruction-set=nocona \ address-model=64 \ --without-python \ --disable-icu \ variant=debug This fails quickly, here: ... - native syslog supported : yes [2] - pthread supports robust mutexes : no [2] - Boost.Regex is header-only : yes [2] error: Unable to find file or target named error: '/boost/align//boost_align' error: referred to from project at error: '{dir}/_dst/libs/atomic/build' make: *** [build] Error 1 I have tried dozens of different things over the past two days and can't remember most of them, but they didn't change the outcome, so I don't supposed they're relevant. The one thing that *did* change the outcome is that, after running `bcp` and before re-bootstrapping in {dir}/_dst, I tried deleting the {dir}/_dst/boost directory. This still failed, but it got slightly further and failed with a different (albeit extremely similar) error: ... - std_wstreambuf : no [2] - std_wstreambuf : no [3] - BOOST_COMP_GNUC >= 4.3.0 : no [2] - BOOST_COMP_GNUC >= 4.3.0 : no [4] error: Unable to find file or target named error: 'libs/thread/build//boost_MYextralLabel_thread' error: referred to from project at error: '.' make: *** [build] Error 1 I feel like I've exhausted my ability to discern what the problem is. Other than updating a handful of compiler flags (like changing cxxstd=17 to cxxstd=20), I'm doing this the same way we have (allegedly) always done it, but it's not working anymore and I don't know why. I would appreciate any guidance you can offer. Thank you, Nick

2 6

"error: No best alternative for {dir}/libs/mpi/build/boost_mpi", but the build succeeds
by Nicholas Williams 17 Jan '25

17 Jan '25

I'm building the full stock, unmodified Boost 1.87.0. I have previously built Boost 1.80.0 without issue. After bootstrapping, when running `b2` to actually build Boost, I get the following "errors": ... - has stat::st_birthtimespec : yes [5] - has fdopendir(O_NOFOLLOW) : yes [5] - has dirent::d_type : yes [5] - has POSIX *at APIs : no [5] - has fallocate : no [5] - cxx11_static_assert : yes [5] error: No best alternative for {dir}/libs/mpi/build/boost_mpi with <abi>aapcs <address-model>64 <architecture>arm <asynch-exceptions>off <binary-format>mach-o <boost.beast.allow-deprecated>on <boost.beast.separate-compilation>on <boost.cobalt.executor>any_io_executor <boost.cobalt.pmr>std <context-impl>fcontext <coverage>off <cxxstd-dialect>iso <cxxstd>20 <debug-symbols>off <exception-handling>on <extern-c-nothrow>off <inlining>full <instruction-set>nocona <known-warnings>hide <link>shared <optimization>speed <os>MACOSX <pch>on <preserve-test-targets>on <profiling>off <python-debugging>off <python>3.9 <rtti>on <runtime-debugging>off <runtime-link>shared <stdlib>native <strip>off <target-os>darwin <testing.execute>on <threadapi>pthread <threading>multi <toolset-clang:platform>darwin <toolset-clang:version>14 <toolset>clang <variant>release <vectorize>off <visibility>hidden <warnings-as-errors>off <warnings>on <x-deduced-platform>arm_64 matched: (empty) matched: (empty) error: No best alternative for {dir}/libs/mpi/build/boost_mpi with <abi>aapcs <address-model>64 <architecture>arm <asynch-exceptions>off <binary-format>mach-o <boost.beast.allow-deprecated>on <boost.beast.separate-compilation>on <boost.cobalt.executor>any_io_executor <boost.cobalt.pmr>std <coverage>off <cxxstd-dialect>iso <cxxstd>20 <debug-symbols>off <exception-handling>on <extern-c-nothrow>off <inlining>full <instruction-set>nocona <known-warnings>hide <link>shared <optimization>speed <os>MACOSX <pch>on <preserve-test-targets>on <profiling>off <python-debugging>off <python>3.9 <rtti>on <runtime-debugging>off <runtime-link>shared <stdlib>native <strip>off <target-os>darwin <testing.execute>on <threadapi>pthread <threading>multi <toolset-clang:platform>darwin <toolset-clang:version>14 <toolset>clang <variant>release <vectorize>off <visibility>hidden <warnings-as-errors>off <warnings>on <x-deduced-platform>arm_64 matched: (empty) matched: (empty) - gcc visibility : yes [2] - cxx14_decltype_auto : yes [2] - cxx14_generic_lambdas : yes [2] ... I used scare quotes around "errors," because these errors do not appear to actually break anything. The build completes fully and successfully, and all the libraries are built as expected. It appears to be more of a warning than an error, but I don't love warnings either, so I'd like to solve it. The only relevant result I could find Googling about this was [this other mailing list message]( https://lists.boost.org/Archives/boost/2024/11/258275.php) which was a reply to "[release] Boost 1.87.0 Beta 2 Release Candidate is available," and to which nobody ever replied. Doesn't really clear anything up for me. FWIW, I get these "errors" on RHEL 8 GCC 8, 9 GCC 11, and 9 GCC 14; Ubuntu 20.04 GCC 9, 22.04 GCC 11, and 24.04 GCC 13; macOS 12 Clang 14 (Intel and ARM), 14 Clang 16 (Intel and ARM), and 15 Clang 16 (Intel and ARM); Windows 10 MSVC 2022 and 11 MSVR 2022; and Windows Server 2022 MSVC 2022 and 2025 MSVC 2022. Any insights or guidance would be appreciated. Thanks, Nick

2 4

ICU not found while building Boost
by Cory Riddell 13 Jan '25

13 Jan '25

I'm having trouble building Boost 1.87 on Windows using the latest VS2022. I'm starting from the "x64 Native Tools Command Prompt for VS 2022". I've downloaded the latest ICU binaries and updated my PATH, LIB, and INCLUDE environment variables: set PATH=%PATH%;D:\icu\bin64 set LIB=%LIB%;D:\icu\lib64 set INCLUDE=%INCLUDE%;D:\icu\include I go into my boost directory and run bootstrap.bat. It seems to complete, creating b2.exe. I then run "b2 address-model=64" and it's not finding icu: E:\boost_1_87_0>b2 address-model=64 Performing configuration checks - default address-model : 64-bit [1] - default architecture : x86 [1] Building the Boost C++ Libraries. warning: Graph library does not contain MPI-based parallel components. note: to enable them, add "using mpi ;" to your user-config.jam. note: to suppress this message, pass "--without-graph_parallel" to bjam. - icu : no [2] - iconv (libc) : no [2] - iconv (separate) : no [2] - cxx11_auto_declarations : yes [2] - cxx11_decltype : yes [2] I ctrl-c to quit at this point and looked at my config.log and it doesn't seem to find icu when building has_icu_test.obj: compile-c-c++ bin.v2\libs\locale\build\msvc-14.3\debug\x86_64\link-static\threading-multi\has_icu_test.obj has_icu_test.cpp E:\boost_1_87_0\libs\locale\build\has_icu_test.cpp(6): fatal error C1083: Cannot open include file: 'unicode/coll.h': No such file or directory The file D:\icu\include\unicode\coll.h does exist though. Is there some reason my environment variables don't make it to the processes kicked off by b2? Or am I overlooking something obvious? Any help is greatly appreciated. Cory

3 3

Generating a fully namespaced boost installation
by Janosch Machowinski 07 Jan '25

07 Jan '25

Hi, we ran into an issue, were the system installation of boost is exposed by a third party lib we rely on (ROS), but it contains a bug. The bug in boost is fixed in a way more recent version of boost, therefore we are looking into using two versions of boost at the same time. To archive this, we want to run the newer boost version in a custom namespace, and already found the bcp tool, that helps with generating a namespace version of boost for us. The issue we are now hitting is, that the includes in our custom boost version are not altered by bcp, and therefore pick up the system headers. E.g. geometry.hpp contains '#include <boost/geometry/geometry.hpp>' but in order to work for us, it would need to be '#include <our_boost/geometry/geometry.hpp>'. Are we missing some magical bcp option, or is this just not supported ? Thx Janosch -- Janosch Machowinski cellumation GmbH | Linzer Str.5 | 28359 Bremen | Germany P: +49 421 331135 35 F: +49 421 331135 99 J.Machowinski(a)cellumation.com Website | YouTube Registernummer: HRB32569 | Registergericht: Amtsgericht Bremen | Ust-Id.Nr.: DE313140406 Geschäftsführer: Dr.-Ing. Hendrik Thamer, Claudio Uriarte Diese E-Mail und alle damit übermittelten Dateien sind vertraulich und ausschließlich für die Verwendung durch die Person oder Gesellschaft, an die sie adressiert sind, bestimmt. Die Weitergabe sowie Vervielfältigung, Verwertung und Mitteilung des Inhalts der E-Mail sind nur mit unserer ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere für den Fall der Schutzrechtsanmeldung This e-mail and all files transmitted with it are confidential and intended exclusively for use by the person or company to whom they are addressed. The transmission, reproduction, exploitation and communication of the contents of the e-mail are only permitted with our express permission. All rights reserved, in particular in the event of an application for industrial property rights.

1 0

asio::strand: Order of execution
by Georg Gast 28 Dec '24

28 Dec '24

Hi, If I use a asio::strand and post() there multiple function objects, are they executed in the same order or is the order of execution not specified? I think to use it as a work queue but I need them to be processed in sequence... Thx Georg

1 0

[release] Boost 1.87.0
by Marshall Clow 12 Dec '24

12 Dec '24

Release 1.87.0 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 two new libraries: * Boost.Parser: A framework for building parsers, from Zach Laine. The release also contains numerous enhancements and bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/news/version_1.87.0> You can also download directly from: <https://boostorg.jfrog.io/artifactory/main/release/1.87.0/> 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. -- The Boost Release Team Marshall Clow, Glen Fernandes, Ion Gaztañaga

1 0

[release] Boost 1.87.0 beta 1 released
by Marshall Clow 16 Nov '24

16 Nov '24

Boost release 1.86.0 beta 1 is now available at: https://archives.boost.io/beta/1.87.0.beta1/source/ The SHA256 checksums are: 2e7cdf358526e8937b36b93fc96c501b8d6a0c8436e95e65440de31c48ec3086 boost_1_87_0_b1.tar.bz2 98a86940c13509dfd0288a3075280f46a76c9a3faeb8a9bf49ca7f9e6a271995 boost_1_87_0_b1.tar.gz 2ca4c019d0c96fd160dec5292a7a6bfcf7b4e592cd238a2207e17084f8021d08 boost_1_87_0_b1.zip 5ea32facd963dbb79ceb5bda7ef7546017ea5da854158f8933bbad74d6bbe622 boost_1_87_0_b1.7z This is slightly different than the RC3. Someone committed a documentation fix to master after we had started the release process, and rather than re-do the whole thing (and re-tag everything), we decided to go with the release that we prepared. The person who did this has been informed of the problems that he caused, and I don’t think he’ll do it again. Release notes (still need updates): https://www.boost.org/users/history/version_1_87_x.html Please try the beta and report any problems you encounter. Thanks to everyone who contributed to the release. -- Boost Release Team

1 0

Unable to find boost atomic library header files//boost-1.84.0
by Pawan Badganchi 15 Oct '24

15 Oct '24

Hi, I am trying to resolve below error. Tried adding below path to atomic.cmake custom file but still failing with same issue. Could you please help here? include_directories( ${Boost_LIBRARY_DIRS}/atomic/test ) ERROR: Compilation failed Stdout: [ 50%] Building CXX object CMakeFiles/test_atomic.dir/atomicity.cpp.o Stderr: /sdk/sysroots/core2-64-poky-linux/usr/share/doc/boost-atomic/examples**/atomicity.cpp:38:10: fatal error: test_clock.hpp: No such file or directory 38 | #include "test_clock.hpp" | ^~~~~~~~~~~~~~~~ compilation terminated. make[2]: ***** [CMakeFiles/test_atomic.dir/build.make:76: CMakeFiles/test_atomic.dir/atomicity.cpp.o] Error 1 make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/test_atomic.dir/all] Error 2 make: *** [Makefile:91: all] Error 2 Returncode: Expected: 0 Actual: 2 Below is the my atomic.cmake file content. cmake_minimum_required(VERSION 2.8) FIND_PACKAGE(Boost REQUIRED COMPONENTS atomic ) FIND_PACKAGE(Boost REQUIRED COMPONENTS thread ) include_directories( ${Boost_LIBRARY_DIRS}/atomic/test ) add_executable(test_atomic atomicity.cpp ) target_link_libraries(test_atomic ${Boost_LIBRARIES} ) Thanks & Regards, Pawan KPIT Technologies,Pune This message contains information that may be privileged or confidential and is the property of the KPIT Technologies Ltd. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. KPIT Technologies Ltd. does not accept any liability for virus infected mails.

1 0

[boost] Boost.LEAF in Embedded Systems (CppCon)
by Vinnie Falco 23 Sep '24

23 Sep '24

At CppCon 2024 the C++ Alliance sponsored a program to interview conference goers about Boost-related topics. This is the first video in the series: Boost.LEAF in Embedded Systems: Insights from Ex-Google Engineer Khalil Estelle at CppCon https://www.youtube.com/shorts/BksBxnTLltY Enjoy! Thanks

1 0

[PFR] names_as_array doesn't work for structs with array fields
by Chinmay Dalal 23 Sep '24

23 Sep '24

Hi, `boost::pfr::names_as_array<T>()` does not compile if `T` has an array member. Someone commented a fix on a similar issue: https://github.com/boostorg/pfr/issues/170 What would be the appropriate place to ask for including this fix? Background: I'm trying to print structs as CSV. I came up with this: https://paste.sr.ht/~p00f/667e013c23c991ddec91e9cdaa00bd3c11cb2ceb But as soon as I include an array member: https://paste.sr.ht/~p00f/aa08531cd100f8b94c49ead2c541ff96f55b362e it does not compile: https://paste.sr.ht/~p00f/636c1e3ab4f5ba86aa865f70f32337b3d2872047 Thanks, Chinmay

1 0

Boost.Asio UDP sockets guarantee for ordering
by Kalesis, Ioannis 18 Sep '24

18 Sep '24

Hello, I am using boost.asio for udp sockets to broadcast multicast traffic. For that, I am using async_send methods. I am aware that there is no guarantee for the order of the completion handlers for the async_send calls, and for that reason I have implemented a queueing mechanism, where the coroutine waits for the current async_send to complete before moving forward to the next call. However, given the low latency requirement of the application, I believe that the following approach may be more optimal: * The async_send operation would happen immediately one after another (not concurrently) without waiting for the previous ones to complete. * The queueing mechanism would be used but only for the post processing work completion handlers. The above will provide both better latency (by sending the packets sooner instead of having to enqeue/spawn_co/dequeue) and still maintain the strict ordering requirement of the post processing work. However, one concern that I have with this approach is with the "multiple" async_send calls being made one after the other. After searching on this topic, I arrived at the conclusion that this is "safe" given that they are not composed operations so there is no risk that the data will be interleaved between packets. The point that I need help understanding is whether there is a guarantee on the order of the packets being enqueued to kernels network stack. For the following example: ``` udp_socket.async_send(packet1,...); upd_socket.async_send(packet2,...); ``` Is there any possible way for "packet2" to be enqueued 1st in the kernel network stack? Similarly, Is it possible for it to be sent by the OS 1st? I acknowledge that even if everything went perfect on the machine, packets could still be received out-of-order to the clients and that is acceptable, however I would like at least to not have the application contribute to this as part of a software issue. The application has multiple threads that run the same io_context with strands in place to have thread-safety. My machine is a redhat 9, gcc 11.4 Thank you in advance for your time and cooperation. Best regards

4 4

Re: [Boost-users] Boost-users Digest, Vol 5734, Issue 1
by Oran Johnson 09 Sep '24

09 Sep '24

Any ideas as to how to correct the following? johnson@fedora:~/opensource$ svn co https://svn.boost.org/svn/boost/sandbox sandbox svn: E170013: Unable to connect to a repository at URL 'https://svn.boost.org/svn/boost/sandbox' svn: E000111: Error running context: Connection refused ________________________________ From: Boost-users <boost-users-bounces(a)lists.boost.org> on behalf of boost-users-request(a)lists.boost.org <boost-users-request(a)lists.boost.org> Sent: Tuesday, August 27, 2024 8:00 AM To: boost-users(a)lists.boost.org <boost-users(a)lists.boost.org> Subject: Boost-users Digest, Vol 5734, Issue 1 Send Boost-users mailing list submissions to boost-users(a)lists.boost.org To subscribe or unsubscribe via the World Wide Web, visit https://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request(a)lists.boost.org You can reach the person managing the list at boost-users-owner(a)lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. Accessing the Boost Sandbox (oranjsr(a)gmail.com) ---------------------------------------------------------------------- Message: 1 Date: Mon, 26 Aug 2024 10:00:58 -0400 From: <oranjsr(a)gmail.com> To: <boost-users(a)lists.boost.org> Subject: [Boost-users] Accessing the Boost Sandbox Message-ID: <010601daf7c0$60c585b0$22509110$(a)gmail.com> Content-Type: text/plain; charset="utf-8" Hi, I'm looking at a source forge project with the following required libraries: 1) Boost version 1.39 or later 2) TBB (Threading Building Blocks) version 2.1 or later 3) MSM (Meta State Machine) version 1.2 or later 4) Boost Logging Library v2 #3 appears to be in the boost sandbox Does boost sandbox still exists? Boost Sandbox When boost was developed using subversion, the Boost Sandbox contained unreviewed code that is intended to eventually become a part of the Boost libraries. New libraries should be developed separately as <https://svn.boost.org/trac/boost/wiki/ModularBoost> git modules, and existing projects should be <https://svn.boost.org/trac/boost/wiki/ExtractSandbox> moved to GitHub. The sandbox remains as a historical record. Accessing the Boost Sandbox The Boost Sandbox lives at <https://svn.boost.org/svn/boost/sandbox> https://svn.boost.org/svn/boost/sandbox within the old Boost Subversion repository. Regards Oran

2 1

[filesystem] why is this file not found?
by Michael Burr 04 Sep '24

04 Sep '24

I'm having difficulty using boost/filesystem.hpp on a simple test example. If I understand things correctly, this code should see if it can find the files called "test_file" and "test_file2" in the current directory. ``` #include <boost/filesystem.hpp> #include <iostream> using namespace boost::filesystem; int main() { path file1 = "test_file", file2 = "test_file2"; if(status(file1).type() == file_not_found) std::cout << "First file not found\n"; if(status(file2).type() == file_not_found) std::cout << "Second file not found\n"; return 0; } ``` If I run the following, ``` touch test_file g++ filesystem_check.cpp -lboost_filesystem ./a.out ``` the result is > First file not found > Second file not found I expected only the second file to be not found. I arrived at this question because exists(file1) was returning false when I thought it should return true, and I traced the issue back to this check. I've also tried this example with an absolute path, and the results were the same. This is using Boost 1.81 installed via macports on a mac with OS 12.5.1 (so slightly out-of-date OS). Is this a mac issue or am I missing something in my code?

2 1

Accessing the Boost Sandbox
by oranjsr＠gmail.com 26 Aug '24

26 Aug '24

Hi, I'm looking at a source forge project with the following required libraries: 1) Boost version 1.39 or later 2) TBB (Threading Building Blocks) version 2.1 or later 3) MSM (Meta State Machine) version 1.2 or later 4) Boost Logging Library v2 #3 appears to be in the boost sandbox Does boost sandbox still exists? Boost Sandbox When boost was developed using subversion, the Boost Sandbox contained unreviewed code that is intended to eventually become a part of the Boost libraries. New libraries should be developed separately as <https://svn.boost.org/trac/boost/wiki/ModularBoost> git modules, and existing projects should be <https://svn.boost.org/trac/boost/wiki/ExtractSandbox> moved to GitHub. The sandbox remains as a historical record. Accessing the Boost Sandbox The Boost Sandbox lives at <https://svn.boost.org/svn/boost/sandbox> https://svn.boost.org/svn/boost/sandbox within the old Boost Subversion repository. Regards Oran

1 0

Code using Boost::Compute builds fine on Linux, but not on Windows
by David Frischknecht 22 Aug '24

22 Aug '24

I wrote this simple program to learn how to use Boost::Compute. The program failed to build on Windows, but builds without any errors on Linux. If I modify the program to only operate on one vector, it works fine. On Windows I'm using vcpkg to pull in both Boost::Compute as well as the OpenCL SDK and I'm using Visual Studio 2022 to build the project. #define CL_TARGET_OPENCL_VERSION 300 #include <random> #include <vector> #include <boost/compute/core.hpp> #include <boost/compute/lambda.hpp> #include <boost/compute/algorithm/transform.hpp> #include <boost/compute/container/vector.hpp> std::mt19937 rng{ std::random_device()() }; std::uniform_int_distribution<> dist(1); namespace compute = boost::compute; using namespace boost::compute::lambda; int GetRandomNumber() { return dist(rng); } int main(int argc, char* argv[]) { const auto device = compute::system::default_device(); const compute::context context(device); compute::command_queue commandQueue(context, device); std::vector<int> hostVector1(10000); std::vector<int> hostVector2(10000); std::vector<int> hostResultVector(10000); std::ranges::generate(hostVector1, GetRandomNumber); std::ranges::generate(hostVector2, GetRandomNumber); compute::vector<int> deviceVector1(hostVector1.size(), context); compute::vector<int> deviceVector2(hostVector2.size(), context); compute::vector<int> deviceResultVector(hostResultVector.size(), context); compute::copy(hostVector1.begin(), hostVector1.end(), deviceVector1.begin(), commandQueue); compute::copy(hostVector2.begin(), hostVector2.end(), deviceVector2.begin(), commandQueue); transform(deviceVector1.begin(), deviceVector1.end(), deviceVector2.begin(), deviceResultVector.begin(), _1 + _2, commandQueue); compute::copy(deviceResultVector.begin(), deviceResultVector.end(), hostResultVector.begin(), commandQueue); return 0; } Here is the build output: Build started at 11:13 PM... 1>------ Build started: Project: BoostComputeTest, Configuration: Debug x64 ------ 1>Main.cpp 1>C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\iterator\transform_iterator.hpp(177,53): error C2039: 'get_buffer': is not a member of 'boost::compute::zip_iterator<boost::tuples::tuple<boost::compute::buffer_iterator<T>,boost::compute::buffer_iterator<T>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>' 1>C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\iterator\transform_iterator.hpp(177,53): error C2039: with 1>C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\iterator\transform_iterator.hpp(177,53): error C2039: [ 1>C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\iterator\transform_iterator.hpp(177,53): error C2039: T=int 1>C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\iterator\transform_iterator.hpp(177,53): error C2039: ] 1>(compiling source file 'Main.cpp') 1> C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\iterator\zip_iterator.hpp(172,7): 1> see declaration of 'boost::compute::zip_iterator<boost::tuples::tuple<boost::compute::buffer_iterator<T>,boost::compute::buffer_iterator<T>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>' 1> with 1> [ 1> T=int 1> ] 1> C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\iterator\transform_iterator.hpp(177,53): 1> the template instantiation context (the oldest one first) is 1> C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\Main.cpp(40,2): 1> see reference to function template instantiation 'OutputIterator boost::compute::transform<boost::compute::buffer_iterator<T>,boost::compute::buffer_iterator<T>,boost::compute::buffer_iterator<T>,boost::compute::lambda::expression<Expr>>(InputIterator1,InputIterator1,InputIterator2,OutputIterator,BinaryOperator,boost::compute::command_queue &)' being compiled 1> with 1> [ 1> OutputIterator=boost::compute::buffer_iterator<int>, 1> T=int, 1> Expr=boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::plus,boost::proto::argsns_::list2<const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<0>>,0>> &,const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<1>>,0>> &>,2>, 1> InputIterator1=boost::compute::buffer_iterator<int>, 1> InputIterator2=boost::compute::buffer_iterator<int>, 1> BinaryOperator=boost::compute::lambda::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::plus,boost::proto::argsns_::list2<const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<0>>,0>> &,const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<1>>,0>> &>,2>> 1> ] 1> C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\algorithm\transform.hpp(75,12): 1> see reference to function template instantiation 'OutputIterator boost::compute::transform<boost::compute::zip_iterator<boost::tuples::tuple<boost::compute::buffer_iterator<T>,boost::compute::buffer_iterator<T>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>,OutputIterator,boost::compute::detail::unpacked<BinaryOperator>>(InputIterator,InputIterator,OutputIterator,UnaryOperator,boost::compute::command_queue &)' being compiled 1> with 1> [ 1> OutputIterator=boost::compute::buffer_iterator<int>, 1> T=int, 1> BinaryOperator=boost::compute::lambda::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::plus,boost::proto::argsns_::list2<const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<0>>,0>> &,const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<1>>,0>> &>,2>>, 1> InputIterator=boost::compute::zip_iterator<boost::tuples::tuple<boost::compute::buffer_iterator<int>,boost::compute::buffer_iterator<int>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>, 1> UnaryOperator=boost::compute::detail::unpacked<boost::compute::lambda::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::plus,boost::proto::argsns_::list2<const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<0>>,0>> &,const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<1>>,0>> &>,2>>> 1> ] 1> C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\algorithm\transform.hpp(48,34): 1> see reference to class template instantiation 'boost::compute::transform_iterator<InputIterator,UnaryOperator>' being compiled 1> with 1> [ 1> InputIterator=boost::compute::zip_iterator<boost::tuples::tuple<boost::compute::buffer_iterator<int>,boost::compute::buffer_iterator<int>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>, 1> UnaryOperator=boost::compute::detail::unpacked<boost::compute::lambda::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::plus,boost::proto::argsns_::list2<const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<0>>,0>> &,const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<1>>,0>> &>,2>>> 1> ] 1> C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\iterator\transform_iterator.hpp(175,15): 1> while compiling class template member function 'int boost::compute::transform_iterator<InputIterator,UnaryOperator>::dereference(void) const' 1> with 1> [ 1> InputIterator=boost::compute::zip_iterator<boost::tuples::tuple<boost::compute::buffer_iterator<int>,boost::compute::buffer_iterator<int>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>, 1> UnaryOperator=boost::compute::detail::unpacked<boost::compute::lambda::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::plus,boost::proto::argsns_::list2<const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<0>>,0>> &,const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<1>>,0>> &>,2>>> 1> ] 1> C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\iterator\iterator_facade.hpp(631,11): 1> see the first reference to 'boost::compute::transform_iterator<InputIterator,UnaryOperator>::dereference' in 'boost::iterators::iterator_core_access::dereference' 1> with 1> [ 1> InputIterator=boost::compute::zip_iterator<boost::tuples::tuple<boost::compute::buffer_iterator<int>,boost::compute::buffer_iterator<int>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>, 1> UnaryOperator=boost::compute::detail::unpacked<boost::compute::lambda::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::plus,boost::proto::argsns_::list2<const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<0>>,0>> &,const boost::compute::lambda::expression<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::compute::lambda::placeholder<1>>,0>> &>,2>>> 1> ] 1>C:\Users\Dave\source\repos\BoostComputeTest\BoostComputeTest\vcpkg_installed\x64-windows\x64-windows\include\boost\compute\iterator\transform_iterator.hpp(177,32): error C2530: 'context': references must be initialized 1>(compiling source file 'Main.cpp') 1>Done building project "BoostComputeTest.vcxproj" -- FAILED. ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== ========== Build completed at 11:13 PM and took 03.315 seconds ========== Is there something I'm missing from my project configuration on Windows? Thanks, Dave F.

1 0

Abwesenheitsnachricht: Re: [boost] [release] Boost.1.86.0
by Sören Textor 16 Aug '24

16 Aug '24

Derzeit bin ich nicht im Hause Ihre E-Mail wird nicht weitergeleitet. In dringenden Fällen bitte support(a)ditec-gmbh.de oder Telefonhotline +49-6221-31698-110 oder die Zentrale +49-6221-31698-0 kontaktieren. Mit freundlichen Grüßen Dr. Sören Textor ----------------------------------------------- DiTEC Dr. Siegfried Kahlich & Dierk Langer GmbH Im Breitspiel 19 | 69126 Heidelberg | Germany Handelsregister | Mannheim | HRB 341229 Dieses Dokument ist vertraulich zu behandeln. Die Weitergabe, sowie Vervielfältigung, Verwertung und Mitteilung seines Inhalts ist nur mit unserer ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere für den Fall der Schutzrechtsanmeldung. This document has to be treated confidentially. Its contents are not to be passed on, duplicated, exploited or disclosed without our express permission. All rights reserved, especially the right to apply for protective rights.

1 0

[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

5 5

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!!!

2 1

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

1 0

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

2 1

[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

1 0

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

2 2

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

2 2

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

2 1

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/

1 0

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…

2 1

boost::flyweights::intermodule_holder
by Foelsche, Peter 10 May '24

10 May '24

Dear All, Thanks for the boost library! Apparently the boost::flyweight::intermodule_holder on LINUX is creating shared memory objects, which by accident (crash?) can persist after the process having created them is already gone. As a result I ran into the following situation: I could not successfully run some code, as it attempted to create an already existing shared memory object created by another user. Would the following be a solution to this problem: Use a copy of the code of the static_holder inside another namespace as attached and compile one module with __INCLUDE_HOLDER__ defined and all the rest without this define? Peter

4 4

Boost Graph - adjacency_list in_edge_iterator are only input_iterator_tag?
by Nic 10 May '24

10 May '24

Hi, Hopefully this is the right place for this. This with Boost 1.81.0 It looks like boost::adjacency_list's in_edge_iterator, out_edge_iterator, and for bidirectional graphs also edge_iterator all are only input iterators. This seems a bit restrictive, and is regardless of the type of EdgeList template parameter. For example, this code (which seems a relatively reasonable thing to want to do) doesn't work: https://godbolt.org/z/n3PdEYo49 It doesn't work because transform_view doesn't define iterator_category if the iterator is not at least a forward iterator (I'm a bit confused as to why that is, but that's not a boost-related thing). I did some digging and found out why the iterator is always an input iterator: The iterators are defined as following: template < class BaseIter, class VertexDescriptor, class EdgeDescriptor, class Difference > struct in_edge_iter : iterator_adaptor< in_edge_iter< BaseIter, VertexDescriptor, EdgeDescriptor, Difference >, BaseIter, EdgeDescriptor, use_default, EdgeDescriptor, Difference > { // .... }; EdgeDescriptor is passed in as the reference type, but it is not a reference so the iterator adaptor always chooses input_iterator_tag for the iterator_category. Does anyone know of a workaround, or know if this is the desired behavior for edge iterators? Am I missing something obvious here? Thank you very much, Nicolas Morales

2 1

boost.asio: random_access_file, io_uring and thread safety
by Matwey V. Kornilov 30 Apr '24

30 Apr '24

Hello, random_access_file is backed by the io_uring kernel interface on Linux. However, It is still unclear from Boost.Asio documentation, whether simultaneous parallel async_write_at in-flight requests are permitted by Asio? The queue of simultaneous requests is natively supported by io_uring. Is it still true for Asio? Is it also safe to fire parallel async_write_at from different threads? -- With best regards, Matwey V. Kornilov

1 0

Is there a buffered tcp stream in ASIO?
by accelerator0099 29 Apr '24

29 Apr '24

|Prepare a tcp server listening on [::]:23380, run the following code: #include <boost/asio.hpp> namespace io = boost::asio; using boost::system::system_error; int main() { try { io::io_context ctx; using io::ip::tcp; using io::buffer; tcp::socket s1(ctx); s1.connect(tcp::endpoint(io::ip::address_v4::loopback(), 23380)); for (size_t i{}; i != 10; ++i) io::write(s1, buffer("123", 3)); } catch (system_error& e) { return 1; } } strace says there are 10 syscalls: connect(6, {sa_family=AF_INET, sin_port=htons(23380), sin_addr=inet_addr("127.0.0.1")}, 16) = 0 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 sendto(6, "123", 3, MSG_NOSIGNAL, NULL, 0) = 3 If I use boost::asio::ip::tcp::iostream: #include <boost/asio.hpp> namespace io = boost::asio; using boost::system::system_error; int main() { try { io::io_context ctx; using io::ip::tcp; using io::buffer; tcp::iostream s1{ tcp::socket(ctx) }; auto& nl = s1.socket(); nl.connect(tcp::endpoint(io::ip::address_v4::loopback(), 23380)); for (size_t i{}; i != 10; ++i) s1.write("123", 3); s1.flush(); } catch (system_error& e) { return 1; } } It does not make sense, still 10 syscalls: connect(6, {sa_family=AF_INET, sin_port=htons(23380), sin_addr=inet_addr("127.0.0.1")}, 16) = 0 ioctl(6, FIONBIO, [1]) = 0 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="123", iov_len=3}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 3 Is there a stream in asio that could buffer the multiple and small pieces of data into one syscall? |

2 1

Difference in regex_replace replacement format handling between Boost.Regex and std::regex
by Josué Andrade Gomes 22 Apr '24

22 Apr '24

There is a difference in how the replacement format string is handled by regex_replace in Boost.Regex and std::regex. Consider the following example: #include <iostream>#include <regex>#include <boost/regex.hpp> int main() { std::string s{"a:b:c"}; std::string rx{":"}; std::string r{"\\$&"}; // Using std::regex std::string result_std = std::regex_replace(s, std::regex(rx), r); std::cout << "std::regex result: " << result_std << std::endl; // Outputs "a\:b\:c" // Using Boost.Regex std::string result_boost = boost::regex_replace(s, boost::regex(rx), r); std::cout << "Boost.Regex result: " << result_boost << std::endl; // Outputs "a$&b$&c" return 0; } std::regex result: a\:b\:c Boost.Regex result: a$&b$&c Affects Boost.Regex 1.84. I didn’t try other versions. Tested with GCC 13.2, clang 18.10 , cl 19.39.33523 and results are the same. Not tested with other versions. https://github.com/boostorg/regex/issues/210

1 0

Regarding a Vulnerability in Boost.Regex library
by kamallochan Jena 18 Apr '24

18 Apr '24

Hello everyone, Hope you all are doing well. There is a Vulnerability reported on Boost library as mentioned below. Any guidance or assistance or reply to this mail would be greatly appreciated. *Vulnerability ID:* BDSA-2018-2656 *Vulnerability Details:* Boost has a flaw in the function boost::re_detail_NUMBER::basic_regex_creator which can lead to a buffer over-read. An attacker can craft and send a malicious file which will trigger the buffer over-read, leading to a denial-of-service. Few query w.r.t boost::re_detail_NUMBER::basic_regex_creator() function: 1. Does Boost.Regex library or any Boost library internally use this function? 2. If the answer is yes, Which all libraries use this function? 3. Is this a known vulnerability and is it fixed in the latest Boost version? please provide some insights like (any change list or file name etc). Our project uses a boost library(which has file "boost/regex/v4/basic_regex_creator.hpp") and uses Boost.Regex library functions. *Should we be worried about this vulnerability (BDSA-2018-2656) affecting our code? * Thanks!

2 1

Any idea on CWE-704(BDSA-2018-1263) and CWE-126 (BDSA-2018-2656)
by kamallochan Jena 15 Apr '24

15 Apr '24

Dear all, Could someone assist me in determining if any version of Boost library is vulnerable to the following CWE? BDSA-2018-1263 CWE-704 and BDSA-2018-2656 CWE-126 Additionally, I would appreciate any details regarding these vulnerabilities, such as - the specific version of the Boost library where the vulnerability was identified - the name of the source code file, the exact line of code and function that causes the vulnerability - Whether the latest version of Boost includes a fix, and if so, which version of the library it was addressed in. Any guidance or assistance on this matter would be greatly appreciated. Thanks, Kjena

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Re: [Boost-users] [beast] I can't write a hello world server
by Senthil Cheetancheri 10 Apr '24

10 Apr '24

(Trying to repost because the previous message was rejected due to size limits.) Hi Loup, The reason I'm taking the time to ask here is because I feel there is something fundamental, likely obvious to the experts, that I don't understand about how beast (and, I'm guessing, asio) works, and how I'm supposed to use it. It seems like you are quite comfortable with C++. That is good because it is a necessary background for this. Boost.Asio and .Beast are inherently advanced topics. The examples use quite advanced C++ knowledge. It could appear simple to experts who understand asio and C++, as well as to newcomers if they were lucky to get the right orientation when they began to learn C++. I had to unlearn a lot of 'C' and old C++ notions. Here are some resources that helped me reach the Aha! moment after a lot of struggles. They are all well worth the patient time you will need. (They are from my bookmarks and are a bit dated. You can easily get the corresponding latest versions.) 1. ASIO: https://www.boost.org/doc/libs/1_79_0/doc/html/boost_asio.html 2. Beast: Watch this video https://youtu.be/7FQwAjELMek at the bottom of the tutorials page https://www.boost.org/doc/libs/1_80_0/libs/beast/doc/html/beast/examples.ht…. This video was a turning point for me. 3. If you would like interactive help, join the #beast channel of the cpplang slack https://cppalliance.org/slack/. They are very kind and super helpful. When you get asio and beast to work well, they are beautiful and give you joy. HTH. Thanks, Senthil.

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Boost.ASIO C++ 20 coroutine equivalent of PPL task_completion_event or JavaScript Promise.resolve?
by Willem Mitchell 09 Apr '24

09 Apr '24

I'm trying to write a simple ASIO send/receiver that uses message queueing. The goal is to have a number of virtual streams over a single TCP connection. This is pretty simple using callbacks, but I can't figure out the coroutines alternative. Here is my simplified sample code. Note that I'm using asio::experimental::promise the same way I would use std::promise which obviously doesn't work, but it illustrates what I'm trying to do. What is the simplest solution to my problem? #pragma once #include "asio.hpp" #include "asio/co_spawn.hpp" #include "asio/detached.hpp" #include "asio/experimental/co_composed.hpp" #include "asio/experimental/promise.hpp" #include "asio/use_awaitable.hpp" #include <coroutine> #include <cstdint> #include <map> #include <memory> #include <queue> struct Message { uint64_t id; uint64_t streamId; uint64_t priority; }; class NetworkConnection { public: NetworkConnection(asio::io_context &ioContext) : ioContext_(ioContext), sendTimer_(ioContext_), receiveTimer_(ioContext_){}; asio::awaitable<std::unique_ptr<Message>> receive(uint64_t streamId) { auto promise = std::make_shared< asio::experimental::promise<std::unique_ptr<Message>>>(); auto future = promise->get_future(); receives_[streamId] = promise; if (!receiving_) { receiving_ = true; co_spawn(ioContext_, startReceiving(), asio::detached); } co_return co_await future; } asio::awaitable<void> send(std::unique_ptr<Message> message) { auto promise = std::make_shared<asio::experimental::promise<void>>(); auto future = promise->get_future(); sends_[message->id] = promise; if (!sending_) { sending_ = true; co_spawn(ioContext_, startSending(), asio::detached); } co_await future; co_return; } private: asio::io_context &ioContext_; asio::steady_timer receiveTimer_; asio::steady_timer sendTimer_; std::map<uint64_t, std::shared_ptr< asio::experimental::promise<std::unique_ptr<Message>>>> receives_; std::map<uint64_t, std::shared_ptr<asio::experimental::promise<void>>> sends_; std::queue<std::unique_ptr<Message>> sendQueue_; bool receiving_ = false; bool sending_ = false; void completeSend(uint64_t messageId) { auto it = sends_.find(messageId); if (it != sends_.end()) { it->second->set_value(); // This resumes the send operation sends_.erase(it); // Clean up } } void completeReceive(std::unique_ptr<Message> message) { auto it = receives_.find(message->streamId); if (it != receives_.end()) { it->second->set_value( std::move(message)); // This resumes the send operation sends_.erase(it); // Clean up } } asio::awaitable<void> startReceiving() { while (!receives_.empty()) { // Simulate receiving a message sendTimer_.expires_after(std::chrono::seconds(1)); co_await sendTimer_.async_wait(asio::use_awaitable); auto message = std::make_unique<Message>(); message->id = 1; message->streamId = 1; message->priority = 1; completeReceive(std::move(message)); } receiving_ = false; co_return; } asio::awaitable<void> startSending() { while (!sends_.empty()) { sendTimer_.expires_after(std::chrono::seconds(1)); auto message = std::move(sendQueue_.front()); sendQueue_.pop(); co_await sendTimer_.async_wait(asio::use_awaitable); completeSend(message->id); } sending_ = false; co_return; } }; class Stream { public: Stream(std::shared_ptr<NetworkConnection> connection) : connection_(std::move(connection)) {} asio::awaitable<std::unique_ptr<Message>> receive() { co_return co_await connection_->receive(id_); } asio::awaitable<void> send(std::unique_ptr<Message> message) { message->streamId = id_; co_return co_await connection_->send(std::move(message)); } private: uint64_t id_; std::shared_ptr<NetworkConnection> connection_; };

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Re: [Boost-users] [beast] I can't write a hello world server
by Mohammad Nejati [ashtum] 08 Apr '24

08 Apr '24

> Then I wait almost 4 seconds for a successful compilation. `-O2` and `-Og -g` are worse at 6 seconds. You are right, Asio and Asio based libraries are usually heavily templated as they need to work with generic executors, buffers and stream types. There are new facilities in Asio for alleviating this issue like any_executor and any_completion_handler which you can utilize to implement async operations in a source file. > I figured I'd write a wrapper, that would confine boost/asio/beast includes to a single compilation unit. The API I'm aiming for looks like this I think you might just use `beast::http::request<string_body>` and `beast::http::response<string_body>` types, you don't need to include all header files, you can just include `boost/beast/http/message.hpp`. > And yet I can sense a potential problem right off the bat: in the `http_server()` function, we call `std::move(socket)`. This move seems to be mandatory here, because removing triggers a compilation error. My point is, it looks like upon incoming connection we move the socket out of its outer context, such that it is no longer bound to the IO context. Is this another error in the example? You don't need to pass a socket to acceptor, it has multiple overloads: https://www.boost.org/doc/libs/1_84_0/doc/html/boost_asio/reference/basic_s… One of them creates a socket and passes it to the completion token, so, you can use it like: acceptor.async_accept([](auto ec, auto socket){ // ... }); Regards, Mohammad On Thu, Apr 4, 2024 at 4:50 PM Loup VAILLANT via Boost-users <boost-users(a)lists.boost.org> wrote: > > Hello, > > So this is rather embarrassing. After working more than 2 days full time I can't even get the most basic code running. I've scoured the docs and tried to find some tutorial, no luck. My onboarding experience so far has been… less than perfect. > > The reason I'm taking the time to ask here is because I feel there is something fundamental, likely obvious to the experts, that I don't understand about how beast (and, I'm guessing, asio) works, and how I'm supposed to use it. Which is probably why seemingly innocuous changes to official example code are causing memory corruptions left and right. > > Let's start at the beginning. > > My first attempt with beast was getting this code to work: > https://www.boost.org/doc/libs/1_73_0/libs/beast/example/http/server/small/… > > Compiling it with `g++ -std=c++20`, gets me a compilation error, thankfully easily fixed. > Then I wait almost 4 seconds for a successful compilation. `-O2` and `-Og -g` are worse at 6 seconds. > > I know many developers would say a few seconds are no big deal (though wen we get to XKCD sword fights it kind of is), but my problem here is that I didn't want to wait every time I made a business logic change to my code. But since 95% of compilation time came from including a huge header-only library, I figured I'd write a wrapper, that would confine boost/asio/beast includes to a single compilation unit. The API I'm aiming for looks like this: > > struct Http_message { > std::unordered_map<std::string, std::string> headers; > std::string body; > }; > struct Http_request : public Http_message { > std::string method; > std::string target; > }; > struct Http_response : public Http_message { > int status; > }; > typedef std::function<Http_response(const Http_request &request)> response_cb; > void http_start(unsigned short port, response_cb on_respond); > > (Note 1: I want web sockets as well, but one problem at a time) > (Note 2: I tried wrapping around http::request and http::response more directly to avoid unnecessary copies, but I ran into lifetime issues.) > > To its credit, this small server example seemed to run well enough, and could serve as a starting point. Before I untangle the business code from the HTTP specific stuff though, I needed to simplify this example a bit. So *this* is my actual starting point: > > > #include <boost/beast/core.hpp> > #include <boost/beast/http.hpp> > > namespace beast = boost::beast; > namespace http = beast::http; > namespace net = boost::asio; > using tcp = boost::asio::ip::tcp; > > class http_connection : public std::enable_shared_from_this<http_connection> > { > public: > http_connection(tcp::socket socket) : socket_(std::move(socket)){} > > void start() > { > auto self = shared_from_this(); > http::async_read( > socket_, buffer_, request_, > [self](beast::error_code ec, std::size_t) { > if(!ec) { self->process_request(); } > }); > deadline_.async_wait( > [self](beast::error_code ec) { > if(!ec) { self->socket_.close(ec); } > }); > } > > private: > tcp::socket socket_; > beast::flat_buffer buffer_{8192}; > http::request <http::dynamic_body> request_; > http::response<http::dynamic_body> response_; > net::steady_timer deadline_ { > socket_.get_executor(), std::chrono::seconds(60) }; > > void process_request() { > response_.version(request_.version()); > response_.keep_alive(false); > response_.result(http::status::ok); > response_.set(http::field::server, "Beast"); > response_.set(http::field::content_type, "text/plain"); > beast::ostream(response_.body()) > << "Target = " << request_.target() << "\n" > << "Method = " << std::string(request_.method_string()) << "\n"; > response_.set(http::field::content_length, > std::to_string(response_.body().size())); > > auto self = shared_from_this(); > http::async_write( > socket_, response_, > [self](beast::error_code ec, std::size_t) { > self->socket_.shutdown(tcp::socket::shutdown_send, ec); > self->deadline_.cancel(); > }); > } > }; > > void http_server(tcp::acceptor& acceptor, tcp::socket& socket) > { > auto cb = [&](beast::error_code ec) { > if(!ec) {std::make_shared<http_connection>(std::move(socket))->start();} > http_server(acceptor, socket); > }; > acceptor.async_accept(socket, cb); > } > > int main(void) > { > auto const address = net::ip::make_address("0.0.0.0"); > unsigned short port = 8080; > net::io_context ioc {1}; > tcp::acceptor acceptor{ioc, {address, port}}; > tcp::socket socket {ioc}; > http_server(acceptor, socket); > ioc.run(); > return 0; > } > > > So far it works. It listens to port 8080, and a curl request or 3 to the server works as expected: > > > $ curl -XYOLO -v http://localhost:8080/foobar > * Trying 127.0.0.1:8080... > * Connected to localhost (127.0.0.1) port 8080 (#0) > > YOLO /foobar HTTP/1.1 > > Host: localhost:8080 > > User-Agent: curl/7.81.0 > > Accept: */* > > > * Mark bundle as not supporting multiuse > < HTTP/1.1 200 OK > < Connection: close > < Server: Beast > < Content-Type: text/plain > < Content-Length: 31 > < > Target = /foobar > Method = YOLO > * Closing connection 0 > > And yet I can sense a potential problem right off the bat: in the `http_server()` function, we call `std::move(socket)`. This move seems to be mandatory here, because removing triggers a compilation error. My point is, it looks like upon incoming connection we move the socket out of its outer context, such that it is no longer bound to the IO context. Is this another error in the example? > > Okay then, how about I pass the socket all the way by reference instead? Let the constructor get a `tcp::socket&`, store this in a `tcp::socket&` member variable, remove all the `std::move`. It compiles, it runs the first query, but at the second query my program just freezes. Or loops, I don't know. > > So that's the first thing. I am _really confused_ about how this socket is supposed to work. Why does it block when I remove the standard moves? Isn't it supposed to be the same socket bound to the same IO context all the way? And I don't think it falls out of scope before the program ends either, it lives on the stack of the `main()` function, and the `ioc.run()`we call at the end blocks until we're done with the async reads (which is, never). > > **Can someone explain to me what the hell is going on with this socket?** > > Right now though I can accept that some dark secret lies behind this `std::move()`, and leave it alone for now. > > Moving on, I'll just admit for the time being that something magical and forbidden lies between this mysterious `std::move()` and prudently leave it behind. Now it's working again, and I can move (no pun intended) to the next step: extracting the business logic to an external function. I start with a trivial extraction: > > void respond(http::response<http::dynamic_body> &response, > const http::request <http::dynamic_body> &request) > { > response.result(http::status::ok); > response.set(http::field::content_type, "text/plain"); > beast::ostream(response.body()) > << "Target = " << request.target() << "\n" > << "Method = " << std::string(request.method_string()) << "\n"; > } > > And modify `process_request()` accordingly: > > void process_request() { > response_.version(request_.version()); > response_.keep_alive(false); > response_.set(http::field::server, "Beast"); > respond(response_, request_); > response_.set(http::field::content_length, > std::to_string(response_.body().size())); > > auto self = shared_from_this(); > http::async_write( > socket_, response_, > [self](beast::error_code ec, std::size_t) { > self->socket_.shutdown(tcp::socket::shutdown_send, ec); > self->deadline_.cancel(); > }); > } > > That works, but this is not quite enough: my goal here is to isolate my user code from the overly long compilation times imposed by this huge boost::beast. Maybe I can include the request & response headers without pulling in the kitchen sink with it, but I don't quite trust it. So let's wrap the `http::response` in some class so I can keep my headers nice and small: > > > class http_response { > public: > http_response(http::response<http::dynamic_body> &response) > : response_(response) {} > > void set_status(int status) { > response_.result(status); > } > void set_header(const std::string &title, > const std::string &value) { > response_.set(title, value); > } > void set_body(const std::string &body) { > beast::ostream(response_.body()) << body; > } > > private: > http::response<http::dynamic_body> &response_; > }; > > > Nothing fancy. And with a forward declaration I should be able to avoid including the response in the header that defines that class. Now I need to modify my business code accordingly: > > > void respond(http_response &response, > const http::request<http::dynamic_body> &request) > { > response.set_status(200); > response.set_header("Content-Type", "text/plain"); > response.set_body( > "Target = " + std::string(request.target()) + "\n" + > "Method = " + std::string(request.method_string()) + "\n"); > } > > > Still not free from `http::request <http::dynamic_body>` yet, but one step at a time. And finally, I need to adjust `process_request()`: > > void process_request() { > response_.version(request_.version()); > response_.keep_alive(false); > response_.set(http::field::server, "Beast"); > http_response response(response_); > respond(response, request_); > response_.set(http::field::content_length, > std::to_string(response_.body().size())); > > auto self = shared_from_this(); > http::async_write( > socket_, response_, > [self](beast::error_code ec, std::size_t) { > self->socket_.shutdown(tcp::socket::shutdown_send, ec); > self->deadline_.cancel(); > }); > } > > > Huh, what do you know, this time around it worked. I no longer experience the lifetime issues I've once had. Okay, I guess I'll add the request wrapper, then: > > > class http_request { > public: > http_request(const http::request<http::dynamic_body> &request) > : request_(request) {} > > std::string target() const { return std::string(request_.target()); } > std::string method() const { return std::string(request_.method_string()); } > > private: > const http::request<http::dynamic_body> &request_; > }; > > void respond(http_response &response, const http_request &request) > { > response.set_status(200); > response.set_header("Content-Type", "text/plain"); > response.set_body( > "Target = " + request.target() + "\n" + > "Method = " + request.method() + "\n"); > } > > void process_request() { > response_.version(request_.version()); > response_.keep_alive(false); > response_.set(http::field::server, "Beast"); > http_response response(response_); > http_request request (request_); > respond(response, request); > response_.set(http::field::content_length, > std::to_string(response_.body().size())); > > auto self = shared_from_this(); > http::async_write( > socket_, response_, > [self](beast::error_code ec, std::size_t) { > self->socket_.shutdown(tcp::socket::shutdown_send, ec); > self->deadline_.cancel(); > }); > } > > > And it still works! Maybe it'll work out in the end? > Regardless, thanks for the rubber ducking I guess. > > My first question remains though: what the hell is going on with the socket? Why can't I just pass a reference along? Why do we even need a move constructor? Is there some special semantics, or `boost::asio` specific arcane, I should be privy to? > > Loup. > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > https://lists.boost.org/mailman/listinfo.cgi/boost-users

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[release] Boost 1.85.0 beta 1 is available
by Marshall Clow 14 Mar '24

14 Mar '24

Boost release 1.85.0 beta 1 is now available at: https://boostorg.jfrog.io/artifactory/main/beta/1.85.0.beta1/source/ The SHA256 checksums are: c13b76f420684a8d5b2eb0f297c281348ba0311d50354d952c5ce7c689e7879b boost_1_85_0_b1.zip e65d529023c7b08d0b92c53fff24ce9df9568cc0fe667c90caf8a9dbc5e63b0d boost_1_85_0_b1.7z 9c1ce4793342e8e57eb34c61f774a9dac0c6fc036084785e416613a18091bacc boost_1_85_0_b1.tar.gz cf7449faedeac9b76bade8ee59007cc4456a14de375dfcbd9e6e38aabe8a1334 boost_1_85_0_b1.tar.bz2 There was one problem reported during the beta release process; when you build the release using b2, it will emit a warning: [errno 2] failed to scan file '': No such file or directory This is harmless, and will be fixed for the final release. the release notes are available at: https://www.boost.org/users/history/version_1_85_0.html Please try the beta and report any problems you encounter. Thanks to everyone who contributed to the release. -- Boost Release Team

2 1

Can SIMD in boost unordered be disabled without disabling SIMD for full compile.
by Ivan Matek 13 Mar '24

13 Mar '24

Hi, I have some small maps where I am pretty sure SIMD tricks that are amazing in general will just slow down the lookups since I never lookup items not in the map and map is so small that benefits of not looking up into the big array and trashing the cache are miniscule. I know I can force compiler to not support SIMD with march, but I want to keep the SIMD optimizaitons for rest of the code, including large boost unordered objects. If you do not believe me I can write a custom benchmark, from what I see all benchmarks in docs start at 1E+4. P.S. I know I can just use an array, but I am in that "size range" where iteration becomes slower than a hash map. regards, Ivan

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Re: [Boost-users] Hi all,
by Pavel Vazharov 06 Mar '24

06 Mar '24

Hi, The most obvious error that I see is that you use `std::vector<char> buffer_data(1024);`as local variables and then they are destroyed but you continue to keep references to them via the boost::asio::buffer. The latter will not keep the `std::vector`s alive. You need to keep the std::vector as a member variable and only when you call the asio functions use the `boost::asio::buffer` function. Like m_socketHandler->socket.async_read_some(boost::asio::buffer(m_buffer_data), ... Where the m_buffer_data is a member variable of type `std::vector<char>`. HTH, Pavel.

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Hi all,
by Maria Tirindelli 06 Mar '24

06 Mar '24

I am experiencing an issue with boost 1.74 on linux. I am trying to have a server that asynchronously reads data from a tcp socket, and then closes when the client disconnect. My code looks like: class SimpleTCPServerTest::SocketHandler { public: explicit SocketHandler(boost::asio::ip::tcp::socket inputSocket ) : socket(std::move(inputSocket)) { socket.set_option(boost::asio::socket_base::keep_alive(true)); } boost::asio::ip::tcp::socket socket; }; SimpleTCPServerTest::SimpleTCPServerTest(std::string address, int port) : m_address(std::move(address)), m_port(port), m_ioc(boost::asio::io_context(1)), m_acceptor(boost::asio::ip::tcp::acceptor(m_ioc)), readTimer(m_ioc){ std::vector<char> buffer_data(1024); this->m_buffer = boost::asio::buffer(buffer_data); } bool SimpleTCPServerTest::open() { //auto const address = boost::asio::ip::make_address(ip); boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), static_cast<unsigned short>(m_port)); boost::system::error_code ec; // Open the acceptor m_acceptor.open(endpoint.protocol(), ec); if (ec) { LOG_ERROR("SimpleTCPServerTest", "Failed to open acceptor: " << ec.message()); return false; } // Allow address reuse m_acceptor.set_option(boost::asio::socket_base::reuse_address(true), ec); if (ec) { LOG_ERROR("SimpleTCPServerTest", "Failed to set reuse option in acceptor: " << ec.message()); return false; } // Bind to the server address m_acceptor.bind(endpoint, ec); if (ec) { LOG_ERROR("SimpleTCPServerTest", "Failed to bind acceptor: " << ec.message()); return false; } // Start listening for connections m_acceptor.listen(boost::asio::socket_base::max_listen_connections, ec); if (ec) { LOG_ERROR("SimpleTCPServerTest", "acceptor failed to start listening: " << ec.message()); return false; } m_acceptor.async_accept(boost::asio::make_strand(m_ioc), [this](boost::system::error_code ec, boost::asio::ip::tcp::socket socket) { on_accept(ec, std::move(socket)); }); m_iocRunThread = boost::thread([this] { m_ioc.run(); LOG_INFO("Exiting run thread"); }); return true; } } void SimpleTCPServerTest::on_accept(boost::system::error_code ec, boost::asio::ip::tcp::socket socket) { LOG_INFO("Client is connected"); m_socketHandler = std::make_unique<SocketHandler>(std::move(socket)); read(); } void SimpleTCPServerTest::read() { LOG_INFO("SimpleTCPServerTest", "Waiting a new message"); readTimer.expires_from_now(boost::posix_time::milliseconds(50)); readTimer.async_wait([this](boost::system::error_code ec) { LOG_INFO("Timer expired"); if (ec != boost::asio::error::operation_aborted) return; LOG_INFO("Timer expired with error"); m_socketHandler->socket.cancel(); }); m_socketHandler->socket.async_read_some(m_buffer, [this](const boost::system::error_code error, // Result of operation. std::size_t bytes_transferred) { if (error) { LOG_INFO("Client disconnected: " << error.message()); signalReadyToStop.emitSignal(); // HERE IT CRASHES return; } std::string dataString(boost::asio::buffer_cast<const char*>(m_buffer), bytes_transferred); LOG_INFO("Data was received: Size: " << bytes_transferred << " " << dataString); // Reset the buffer std::vector<char> buffer_data(1024); this->m_buffer = boost::asio::buffer(buffer_data); this->read(); }); } SimpleTCPServerTest::~SimpleTCPServerTest() { LOG_INFO("Terminating"); readTimer.cancel(); m_acceptor.cancel(); m_socketHandler->socket.cancel(); m_ioc.stop(); m_iocRunThread.join(); } The client is a simple python client that sends a few messages before disconnecting. my main.cpp is like: std::atomic<bool> m_runFlag = true; SimpleTCPServerTest server; server.signalReadyToStop.connect([&m_runFlag](){ m_runFlag =false; }); server.open(); while(m_runFlag) { std::this_thread::sleep_for(std::chrono::milliseconds(1000)); } LOG_INFO("Exiting test"); } The problem is that the code always crashes when returning from the async_read (indicated with "HERE IT CRASHES COMMENT") with error SIGABRT tcache_thread_shutdown(): unaligned tcache chunk detected. Even if I remove the return statement there, I still have the crash when calling m_ioc.stop(). It seems the error occurs when exiting from the m_iocRunThread (the "Exiting run thread" log is executed) What am I doing wrong? Thanks everyone

1 0

tommath.h and boost\multiprecision\tommath.hpp
by Helmut Zeisel 28 Feb '24

28 Feb '24

I tried to use boost muiltiprecision with Visual Studio 2022, 64 bit and got the following error message: boost\multiprecision\tommath.hpp(444,36): error C2664: 'mp_err mp_radix_size(const mp_int *,int,size_t *)': cannot convert argument 3 from 'int *' to 'size_t *' I used tommath.h from https://github.com/libtom/libtommath/blob/develop/tommath.h that has (line 583) mp_err mp_radix_size(const mp_int *a, int radix, size_t *size) MP_WUR; but boost\multiprecision\tommath.hpp, lineS 443/444 are int s; detail::check_tommath_result(mp_radix_size(const_cast< ::mp_int*>(&m_data), base, &s)); I compared with cygwin, there tommath.h is mp_err mp_radix_size(const mp_int *a, int radix, int *size) MP_WUR; So I am not sure: do I need some different tommath for Visual Studio 2022, 64 bit, or should boost\multiprecision\tommath.hpp be changed? Helmut

2 3

boost::stacktrace::stacktrace AND addr2line
by Foelsche, Peter 19 Feb '24

19 Feb '24

Dear All, Thanks for outstanding quality of boost! I'm using the stacktrace object together with debug info and BOOST_STACKTRACE_USE_ADDR2LINE defined. Would it be possible to cache the output of addr2line assuming that during the lifetime of the calling process the queried executable or shared objects do not change? Thanks Peter

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[boost::interprocess] between Rosetta and native apps - please advice how to fix issue
by Frank G 08 Feb '24

08 Feb '24

We need named IPC between Rosetta and native apps. In boost this seems not compatible, for example with Native app and we are unable to find the "MAP_FNAME" in find_and_construct on the Rosetta process. Works fine when each process is on same arch. " typedef boost::interprocess::managed_shared_memory shared_mem;shared_mem* seg;seg = new shared_mem(boost::interprocess::open_or_create, SHARED_FILENAME, F_MAX_TOTALBUF_SIZE );Img = seg->find_or_construct<imgtype>(MAP_FNAME)(); " Root cause seems to be MemoryAlgorithm and alignment.This has alignment of 16 for Rosetta and 8 for native.The 8 byte shift seems to be the root cause and I can see this when viewing memory. Looking deeper over the last few days we can see this from the difference in frontend size (from MemoryAlgorithm): "boost::interprocess::open_or_create This creates different sized frontend (iset_index 8 or 16)for Native vs Rosetta. frontend is defined from: boost::interprocess::ipcdetail::basic_managed_memory_impl<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index, 16> *const Then perform segment->find_or_construct<mtstruct>(MAP_FNAME)(); does not work across arch." Ideally we prefer not to write a bunch of complex custom allocators etc to get this to work with open_or_create and find_or_construct, and hoping there is some simplest solution. Questions: how can we workaround this? Can we force boost::interprocess::open_or_create to use same memory algo for both arch? Or force alignment to 16 for both arch?

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Fwd: Using ASIO to wait on a foreign socket being readable, with a timeout
by Dominique Devienne 19 Jan '24

19 Jan '24

Sorry, sent originally to the wrong list. And this is on Windows 10 too, BTW. Haven't tried Linux with that code yet. --DD ---------- Forwarded message --------- From: Dominique Devienne <ddevienne(a)gmail.com> Date: Thu, Jan 18, 2024 at 7:18 PM Subject: Using ASIO to wait on a foreign socket being readable, with a timeout To: <boost(a)lists.boost.org> Hi, I'm trying to use ASIO to wait until a socket is ready to read, or timeout. This is a blocking wait. But the socket is not "owned" by ASIO, but is from the libpq PostgreSQL connection. So ASIO should NOT consume any of the input on the socket, just notify me when that socket is "read-ready". I've cobbled together the following test code: ``` const int socket2 = PQsocket(conn2.handle()); BOOST_CHECK(socket2 > 0); int timr_err_code = 0; int sock_err_code = 0; bool timr_aborted = false; bool sock_aborted = false; std::string timr_err_msg; std::string sock_err_msg; bool timed_out = true; auto c1 = "C# 1"sv; conn2.listen(c1); conn1->notify(c1, "wake up!"sv); { boost::asio::io_context io_ctx; boost::asio::ip::tcp::socket io_sock(io_ctx); io_sock.assign(boost::asio::ip::tcp::v4(), socket2); boost::asio::steady_timer io_timer(io_ctx); io_timer.expires_from_now(std::chrono::milliseconds(100)); io_sock.async_wait( io_sock.wait_read, [&](const boost::system::error_code& errc) { if (errc) { sock_err_code = errc.value(); sock_err_msg = errc.message(); sock_aborted = (errc == boost::asio::error::operation_aborted); } timed_out = false; //io_timer.cancel(); io_ctx.stop(); } ); io_timer.async_wait( [&](const boost::system::error_code& errc) { if (errc) { timr_err_code = errc.value(); timr_err_msg = errc.message(); timr_aborted = (errc == boost::asio::error::operation_aborted); } io_sock.cancel(); io_ctx.stop(); } ); io_ctx.run(); // blocks until either async op above runs } // there's a notif to read, so io_sock.async_wait should have completed BOOST_CHECK_EQUAL(timr_err_code, 0); BOOST_CHECK_EQUAL(sock_err_code, 0); BOOST_CHECK_EQUAL(timr_err_msg, ""); BOOST_CHECK_EQUAL(sock_err_msg, ""); BOOST_CHECK_EQUAL(timr_aborted, false); BOOST_CHECK_EQUAL(sock_aborted, false); BOOST_CHECK_EQUAL(timed_out, false); auto notif = conn2.notification(); BOOST_REQUIRE(notif); BOOST_CHECK_EQUAL(notif.backend_pid(), pid1); BOOST_CHECK_EQUAL(notif.channel(), c1); BOOST_CHECK_EQUAL(notif.payload(), "wake up!"sv); ``` The io_sock.async_wait(io_sock.wait_read, ...) succeeds, the IO loop stops as expected, but when I try to PQconsumeInput() from the LIBPQ connection next (as shown in the code below) ``` Notification Connection::notification() { auto [lock, hndl] = ensure_handle(); if (1 != PQconsumeInput(hndl)) { throw std::runtime_error(error_msg()); // <<<<<< THROWS } PGnotify_uptr notif{ PQnotifies(hndl) }; return Notification(std::move(notif)); // may be null } ``` that calls fail with this error message: fatal error: in "NotificationTests/test_across_backends": class std::runtime_error: could not receive data from server: Socket operation on non-socket (0x00002736/10038) LIBPQ didn't like what ASIO somehow did on the socket descriptor. The LIBPQ doc says to select() the descriptor, but I thought ASIO would be cleaner, more C++, and perhaps more cross-platform. Can somehow help, telling me if I'm using ASIO incorrectly here? Thanks, --DD

2 2

[Scope] Peer review conclusion
by Дмитрий Архипов 15 Jan '24

15 Jan '24

Dear Boost community, the formal review of Boost.Scope has taken place between 26th of November and 5th of December of the previous year. I have received 5 reviews in total, including 4 here on the mailing list and 1 on Reddit. Two of the reviews recommended unconditional, and 3 conditional acceptance. The reviews came from: - Klemens Morgenstern, - Janko Dedic, - Julien Blanc, - David Sankel, - /u/jonesmz on Reddit. Also, several people have given insightful comments but did not provide a review. I would like to thank all of the people who took their time to write reviews or participate in the discussions. Your effort was very important and valuable. The outcome of the review is that Boost.Scope is ACCEPTED with several minor CONDITIONS. 1. noexcept specification on destructors of scope guards should be properly documented. Andrey has already commented that the technical hurdle that prevented it was eliminated. 2. There should be a good motivating example for scope_success. There was a lot of comments regarding scope_success and its seeming uselessness. Without a good example I see the same pattern occurring with future users. 3. The examples should better describe what they are trying to achieve. Several comments about examples suggested incorrect changes, which signals that readers failed to understand them. After a lot of consideration I decided against requesting the author to remove unique_resource and related functionality from the library. While several reviewers wanted a more "concise" library, all noted that the component is useful. One last thing I wanted to point out is that all reviewers and most commenters were adamant that compatibility with the Technical Specification on which this library was initially based should not be a goal. In fact, Andrzej Krzemienski even noted that such compatibility has prevented him from adequately evaluating the library on its own merit. In my opinion this should be a sign to all of us that people prefer better APIs over standard APIs. I recommend Andrey to re-evaluate those parts of the library's APIs that he copied from the TS and potentially pick better names for member functions. Thanks to Andrey for submitting this library to Boost. And thanks again to the reviewers and everyone who provided feedback, who ultimately made this review possible.

1 0

Using Boost in CLR Class
by 임성준 09 Jan '24

09 Jan '24

Hello, I have question about using Boost. I'm trying to using boost in clr class of Visual Studito 2022 When I build the project, I got following error Error C1189 #error: "This library now requires a C++11 or later compiler - this message was generated as a result of BOOST_NO_CXX11_REF_QUALIFIERS being set" ClassLibrary2 C:\Users\bussly\source\repos\ClassLibrary2\packages\boost.1.84.0\lib\native\include\boost\multiprecision\detail\check_cpp11_config.hpp 34 Error (active) E0035 #error directive: "This library now requires a C++11 or later compiler - this message was generated as a result of BOOST_NO_CXX11_REF_QUALIFIERS being set" ClassLibrary2 C:\Users\bussly\source\repos\ClassLibrary2\packages\boost.1.84.0\lib\native\include\boost\multiprecision\detail\check_cpp11_config.hpp 58 Even I didn't make any code, just add an include boost header. Following is the scenario of what I did - Visual Studio 2022 - Create new project -> CLR Class Library(.Net Framework) - Install NuGet Package -> boost 1.84.0 - Add include boost -> #include "boost/geometry.hpp" - Build solution - Error and following is properties of my project - Platform Toolset: Visual Studio 2022(v143) - C++ Language Standard: ISO C++ 20 Standard(/std:c++20) - C Language Standard: Default(Legacy MSVC) I tried with C++ 14 and C++ 17 also, but failed. Can I get any solution for this? Thank you.

1 0

[Boost.Redis] Single Connection Concurrency Inquiry
by Samarah Uriarte 08 Jan '24

08 Jan '24

Hello, I am using the Boost Redis library to write to a local Redis server and would like to inquire about how a single connection can handle concurrent calls. I have several C++ classes that have their own Boost.Redis connections, but this is leading to ASIO-related hanging behavior that is difficult to debug. I would like to simplify the design by initializing only one connection that can be used by all of these classes instead. I know the "async_exec" method supports concurrency but I wonder if this might cause any future issues with larger workloads. Thank you in advance. Sincerely, Samarah Uriarte

1 0

Problems downloading boost on Linux
by Gonzalo Garramuño 01 Jan '24

01 Jan '24

I have tried downloading boost 1.76 on Linux from Argentina with: curl -# -L -o boost_1_76_0.zip.tmp https://boostorg.jfrog.io/artifactory/main/release/1.76.0/source/boost_1_76… and also from the boost web page. This leads to a redirect to JFrog. I tried creating an account with both Google (which led to Invalid credentials - you might not be a registered MyJFrog user. Please try again. ) and with a new account on JFrog which sent me an email requesting my company: To confirm this request, please include the license owner or any other support contact associated with your company's subscription approval in this email thread. Are the boost libraries at www.boost.org available for free or only under subscription? I found I can still download them from sourceforge, of course, but I would need to patch any dependencies that point to the older web-site. -- Gonzalo Garramuño ggarra13(a)gmail.com

2 2

Cobalt link error
by Josué Andrade Gomes 23 Dec '23

23 Dec '23

I'm trying to build a minimal Cobalt library sample. I'm getting link errors: Build and installed Boost with: ./bootstrap.sh --prefix=$HOME/.local ./b2 install Sample: #include <boost/cobalt.hpp> #include <iostream> boost::cobalt::main co_main(int, char *[]) { std::cout << "Hello world\n"; co_return 0; } CMakeLists.txt cmake_minimum_required(VERSION 3.20) project(coro_study) set(CMAKE_EXPORT_COMPILE_COMMANDS ON) set(CMAKE_CXX_STANDARD 20) set(CMAKE_VERBOSE_MAKEFILE ON) set(Boost_VERBOSE 1) set(Boost_DEBUG 1) find_package(Boost REQUIRED COMPONENTS system) add_executable(sample sample.cpp) target_include_directories(sample4 PRIVATE ${Boost_INCLUDE_DIRS}) target_link_libraries(sample4 PRIVATE ${Boost_LIBRARIES}) cmake output: dev ~/Projects/coroutines/x64-linux-debug $ cmake .. -- The C compiler identification is GNU 11.4.0 -- The CXX compiler identification is GNU 11.4.0 -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working C compiler: /usr/bin/cc - skipped -- Detecting C compile features -- Detecting C compile features - done -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Check for working CXX compiler: /usr/bin/c++ - skipped -- Detecting CXX compile features -- Detecting CXX compile features - done -- Found Boost 1.84.0 at /home/dev/.local/lib/cmake/Boost-1.84.0 -- Requested configuration: QUIET REQUIRED COMPONENTS system -- BoostConfig: find_package(boost_headers 1.84.0 EXACT CONFIG REQUIRED QUIET HINTS /home/dev/.local/lib/cmake) -- Found boost_headers 1.84.0 at /home/dev/.local/lib/cmake/boost_headers-1.84.0 -- BoostConfig: find_package(boost_system 1.84.0 EXACT CONFIG REQUIRED QUIET HINTS /home/dev/.local/lib/cmake) -- Found boost_system 1.84.0 at /home/dev/.local/lib/cmake/boost_system-1.84.0 -- Boost toolset is gcc11 (GNU 11.4.0) -- Scanning /home/dev/.local/lib/cmake/boost_system-1.84.0/libboost_system-variant*.cmake -- Including /home/dev/.local/lib/cmake/boost_system-1.84.0/libboost_system-variant-shared.cmake -- [x] libboost_system.so.1.84.0 -- Including /home/dev/.local/lib/cmake/boost_system-1.84.0/libboost_system-variant-static.cmake -- [ ] libboost_system.a -- Adding boost_system dependencies: headers -- Found Boost: /home/dev/.local/lib/cmake/Boost-1.84.0/BoostConfig.cmake (found version "1.84.0") found components: system -- Configuring done -- Generating done -- Build files have been written to: /home/dev/Projects/coroutines/x64-linux-debug make output: dev ~/Projects/coroutines/x64-linux-debug $ make /usr/bin/cmake -S/home/dev/Projects/coroutines -B/home/dev/Projects/coroutines/x64-linux-debug --check-build-system CMakeFiles/Makefile.cmake 0 /usr/bin/cmake -E cmake_progress_start /home/dev/Projects/coroutines/x64-linux-debug/CMakeFiles /home/dev/Projects/coroutines/x64-linux-debug//CMakeFiles/progress.marks make -f CMakeFiles/Makefile2 all make[1]: Entering directory '/home/dev/Projects/coroutines/x64-linux-debug' make -f CMakeFiles/sample4.dir/build.make CMakeFiles/sample4.dir/depend make[2]: Entering directory '/home/dev/Projects/coroutines/x64-linux-debug' cd /home/dev/Projects/coroutines/x64-linux-debug && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/dev/Projects/coroutines /home/dev/Projects/coroutines /home/dev/Projects/coroutines/x64-linux-debug /home/dev/Projects/coroutines/x64-linux-debug /home/dev/Projects/coroutines/x64-linux-debug/CMakeFiles/sample4.dir/DependInfo.cmake --color= make[2]: Leaving directory '/home/dev/Projects/coroutines/x64-linux-debug' make -f CMakeFiles/sample4.dir/build.make CMakeFiles/sample4.dir/build make[2]: Entering directory '/home/dev/Projects/coroutines/x64-linux-debug' [ 50%] Building CXX object CMakeFiles/sample4.dir/sample4.cpp.o /usr/bin/c++ -DBOOST_SYSTEM_DYN_LINK -DBOOST_SYSTEM_NO_LIB -isystem /home/dev/.local/include -std=gnu++20 -MD -MT CMakeFiles/sample4.dir/sample4.cpp.o -MF CMakeFiles/sample4.dir/sample4.cpp.o.d -o CMakeFiles/sample4.dir/sample4.cpp.o -c /home/dev/Projects/coroutines/sample4.cpp [100%] Linking CXX executable sample4 /usr/bin/cmake -E cmake_link_script CMakeFiles/sample4.dir/link.txt --verbose=1 /usr/bin/c++ CMakeFiles/sample4.dir/sample4.cpp.o -o sample4 /home/dev/.local/lib/libboost_system.so.1.84.0 /usr/bin/ld: CMakeFiles/sample4.dir/sample4.cpp.o: in function `co_main(co_main(int, char**)::_Z7co_mainiPPc.Frame*) [clone .actor]': sample4.cpp:(.text+0x2a9): undefined reference to `boost::cobalt::detail::main_promise::final_suspend()' /usr/bin/ld: CMakeFiles/sample4.dir/sample4.cpp.o: in function `main::reset_res::operator()(std::pmr::memory_resource*)': sample4.cpp:(.text._ZZ4mainEN9reset_resclEPNSt3pmr15memory_resourceE[_ZZ4mainEN9reset_resclEPNSt3pmr15memory_resourceE]+0x1c): undefined reference to `boost::cobalt::this_thread::set_default_resource(std::pmr::memory_resource*)' /usr/bin/ld: CMakeFiles/sample4.dir/sample4.cpp.o: in function `main': sample4.cpp:(.text.main[main]+0x5b): undefined reference to `boost::cobalt::this_thread::set_default_resource(std::pmr::memory_resource*)' /usr/bin/ld: sample4.cpp:(.text.main[main]+0xc2): undefined reference to `boost::cobalt::detail::main_promise::run_main(boost::cobalt::main)' /usr/bin/ld: CMakeFiles/sample4.dir/sample4.cpp.o: in function `bool boost::cobalt::detail::promise_receiver<void>::awaitable::await_suspend<boost::cobalt::detail::fork::promise_type>(std::__n4861::coroutine_handle<boost::cobalt::detail::fork::promise_type>)': sample4.cpp:(.text._ZN5boost6cobalt6detail16promise_receiverIvE9awaitable13await_suspendINS1_4fork12promise_typeEEEbNSt7__n486116coroutine_handleIT_EE[_ZN5boost6cobalt6detail16promise_receiverIvE9awaitable13await_suspendINS1_4fork12promise_typeEEEbNSt7__n486116coroutine_handleIT_EE]+0x7f): undefined reference to `boost::cobalt::detail::already_awaited()' /usr/bin/ld: CMakeFiles/sample4.dir/sample4.cpp.o: in function `boost::cobalt::detail::promise_receiver<void>::awaitable::interrupt_await() &': sample4.cpp:(.text._ZNR5boost6cobalt6detail16promise_receiverIvE9awaitable15interrupt_awaitEv[_ZNR5boost6cobalt6detail16promise_receiverIvE9awaitable15interrupt_awaitEv]+0x33): undefined reference to `boost::cobalt::detail::detached_exception()' collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/sample4.dir/build.make:101: sample4] Error 1 make[2]: Leaving directory '/home/dev/Projects/coroutines/x64-linux-debug' make[1]: *** [CMakeFiles/Makefile2:86: CMakeFiles/sample4.dir/all] Error 2 make[1]: Leaving directory '/home/dev/Projects/coroutines/x64-linux-debug' make: *** [Makefile:94: all] Error 2

3 4

Handshake Error 10009
by Jens Kallup 23 Dec '23

23 Dec '23

Hello, I tried use the boost::asio to create a SSL-Server, but I fail. The Code I used is attached to this Text. acceptor_ and context_ give me true result, but the start_accept() methode give me a Handshake-Error: 10009 (invalid descriptor handle). How can I avoid this, and how can I fix the Code in the right point ? Thanks for reading paule32 // ----------------------------------------------------------------- // File: BoostServer.cc // Author: (c) 2023 Jens Kallup - paule32 // All rights reserved // // only for education, and non-profit usage ! // ----------------------------------------------------------------- # include <stdio.h> # include <stdlib.h> # include <sys/types.h> # include <iostream> # include <string> # include <functional> # include <thread> # include <memory> # include <boost/asio.hpp> # include <boost/asio/ssl.hpp> using namespace boost::asio; using namespace std; // ----------------------------------------------------------------- // @brief namespace name for Version 1.0.0 of our project ... // ----------------------------------------------------------------- namespace dBaseRelease { std::string ApplicationExeName; // ----------------------------------------------------------------- // @brief This member handle the exception message text that is use // to "try catch" exception's during the runtime of the // application. // // @param std::string& message - The e.what() message. // @return nothing // // @since dBaseRelease // @author paule32 // ----------------------------------------------------------------- void handle_exception(const std::string& message) { std::string error_message; for (int len = 0; len < message.length(); ++len) { if (message[len] == '[') break; error_message.push_back(message[len]); } std::cerr << "Exception " << error_message << std::endl; } class SSLServer: public std::enable_shared_from_this<SSLServer> { public: SSLServer(io_service& service, uint16_t port): acceptor_(service, ip::tcp::endpoint(ip::tcp::v4(), port)), context_ (ssl::context::tlsv12) { context_.set_options( ssl::context::default_workarounds | ssl::context::sslv2 | ssl::context::sslv3 | ssl::context::tlsv12); if (isAcceptorInitialized() && isContextInitialized ()) { std::cout << "acceptor ok" << std::endl; std::cout << "context ok" << std::endl; start_accept(); } else { std::cout << "server init error" << std::endl; } } private: void start_accept() { ssl_socket_ = std::make_shared<ssl::stream<ip::tcp::socket> >(acceptor_.get_executor(), context_); // ---------------------------------- // Starte den asynchronen Handshake // ---------------------------------- ssl_socket_->async_handshake(ssl::stream_base::server, [this](const boost::system::error_code& error) { if (!error) { // ----------------------------------- // Wenn der Handshake erfolgreich ist, // akzeptiere die Verbindung // ----------------------------------- if (ssl_socket_ && ssl_socket_->lowest_layer().is_open()) { std::cout << "SSL-Handshake erfolgreich und verbunden." << std::endl; acceptor_.async_accept(ssl_socket_->lowest_layer(), [this](const boost::system::error_code& accept_error) { if (!accept_error) { handle_client(); } else { std::cerr << "Accept error: " << accept_error.message() << std::endl; } }); } else { std::cerr << "SSL-Handshake erfolgreich, aber Verbindung nicht geöffnet." << std::endl; } } else { std::cerr << "Handshake error: " << error.message() << " (" << error.value() << ")" << std::endl; } }); } void handle_client() { // ------------------------------------ // Lese/Schreibe Daten mit ssl_socket_ // ------------------------------------ boost::asio::async_read_until(*ssl_socket_, buffer_, '\n', [this](const boost::system::error_code& read_error, std::size_t bytes_transferred) { if (!read_error) { std::istream is(&buffer_); std::string received_data; std::getline(is, received_data); std::cout << "Received data from client: " << received_data << std::endl; // ----------------------------------------- // Hier kannst du auf die empfangenen Daten // reagieren und die Antwort vorbereiten // ----------------------------------------- std::string response = "Hello from the server!\n"; // ----------------------------------------- // Sende die Antwort an den Client // ----------------------------------------- boost::asio::async_write(*ssl_socket_, boost::asio::buffer(response), [this](const boost::system::error_code& write_error, std::size_t) { if (!write_error) { // ----------------------------- // Schließe die Verbindung // ----------------------------- ssl_socket_->lowest_layer().close(); // ----------------------------- // Starte die nächste Akzeptanz // ----------------------------- start_accept(); } else { std::cerr << "Write error: " << write_error.message() << std::endl; } }); } else { std::cerr << "Read error: " << read_error.message() << std::endl; } }); } // ------------------------------------------------ // Überprüfung, ob der Acceptor initialisiert wurde // ------------------------------------------------ bool isAcceptorInitialized() const { return acceptor_.is_open(); } // ------------------------------------------------ // Überprüfung, ob der Context initialisiert wurde // ------------------------------------------------ bool isContextInitialized() { try { // ---------------------------------- // load certificate, and private key // ---------------------------------- context_.use_certificate_chain_file("server.crt.pem"); context_.use_private_key_file("server.key.pem", ssl::context::pem); return true; } catch (const boost::system::system_error& e) { handle_exception(e.what()); return false; } } private: ip::tcp::acceptor acceptor_; ssl::context context_; std::shared_ptr<ssl::stream<ip::tcp::socket>> ssl_socket_; boost::asio::streambuf buffer_; }; } // namespace: dBaseRelease int main(int argc, char **argv) { using namespace dBaseRelease; try { ApplicationExeName = argv[0]; io_service service; std::shared_ptr<SSLServer> server = std::make_shared<SSLServer>(service, 12345); service.run(); } catch (const std::exception& e) { std::cerr << "Exception: " << e.what() << std::endl; return EXIT_FAILURE; } return EXIT_SUCCESS; } -- Diese E-Mail wurde von Avast-Antivirussoftware auf Viren geprüft. www.avast.com

1 0

Abwesenheitsnachricht: Re: Cobalt link error
by Sören Textor 23 Dec '23

23 Dec '23

Derzeit bin ich nicht im Hause Ihre E-Mail wird nicht weitergeleitet. In dringenden Fällen bitte support(a)ditec-gmbh.de oder Telefonhotline +49-6221-31698-110 oder die Zentrale +49-6221-31698-0 kontaktieren. Mit freundlichen Grüßen Dr. Sören Textor ----------------------------------------------- DiTEC Dr. Siegfried Kahlich & Dierk Langer GmbH Im Breitspiel 19 | 69126 Heidelberg | Germany Handelsregister | Mannheim | HRB 341229 Dieses Dokument ist vertraulich zu behandeln. Die Weitergabe, sowie Vervielfältigung, Verwertung und Mitteilung seines Inhalts ist nur mit unserer ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere für den Fall der Schutzrechtsanmeldung. This document has to be treated confidentially. Its contents are not to be passed on, duplicated, exploited or disclosed without our express permission. All rights reserved, especially the right to apply for protective rights.

1 0

Boost Asio Multicast
by Georg Gast 18 Dec '23

18 Dec '23

Hi there, I wrote an application that is to a good part based on https://www.boost.org/doc/libs/1_83_0/doc/html/boost_asio/example/cpp11/mul… https://www.boost.org/doc/libs/1_83_0/doc/html/boost_asio/example/cpp11/mul… It worked OK on my laptop as the packages arrived in my vm and my host. As we tried it on real machines the packages did not arrive. (all windows machines). With *netsh interface ip show joins* I could see on my laptop that the join was on the ethernet card. On the real machines it choose "the wrong" network card. I tried with "outbound_interface" to change it but didn't work... It's all ipv4. Can or should I use a static route to get the packages into the right net segment? Bye Georg

2 1

[Boost.Asio] Asynchronous queue?
by accelerator0099 16 Dec '23

16 Dec '23

Consider the producer-consumer model: producer -+- consumer1 +- consumer2 +- consumer3 +- consumer4 +- consumer5 The producer periodly push items into a queue, and those consumers wait on that queue for items It's easy to implement in a synchronous, multi-threaded environment: the producer just locks the queue and push into it, and notify one consumer through a condition variable. Consumers waiting on that condition variable will be woken one by one, popping items and consume them How to do those in a asynchronous environment? Consumers async_pop() on that queue, posting their completion tokens into the executor. When there are items available, the executor notify one consumer by calling its completion token Is it right? How do the producer tell the executor "The asynchronous operation is done, You should call that completion token"? My implemention of a possible async queue (based on timers): #include <boost/asio.hpp> #include <deque> #include <iostream> using namespace std::literals; namespace io = boost::asio; using io::awaitable; auto& uawait = io::use_awaitable; template<class D> awaitable<void> delay(const D& dur) { io::steady_timer tm{ co_await io::this_coro::executor }; tm.expires_after(dur); co_await tm.async_wait(uawait); } template<class T> class aqueue { std::deque<T> mq; public: using reference = T&; using const_reference = const T&; size_t size() const noexcept { return mq.size(); } bool empty() const noexcept { return mq.empty(); } awaitable<T> async_pop() { while (empty()) { co_await delay(1ms); } auto t = std::move(mq.front()); mq.pop_front(); co_return t; } awaitable<void> async_push(T t) { mq.push_back(std::move(t)); co_return; } }; class consumer { public: const int id; aqueue<int>& queue; consumer(int _i, aqueue<int>& _q) : id{ _i }, queue{ _q } {} awaitable<void> operator()() { std::cout << "Consumer " << id << " started\n"; auto i = co_await queue.async_pop(); std::cout << "Consumer " << id << " got " < aq; auto producer = [&]() -> awaitable<void> { std::cout << "Producer started\n"; for (int i{}; i != 5; ++i) { co_await delay(1s); co_await aq.async_push(i); } }; io::co_spawn(ctx, producer, io::detached); for (int i{}; i != 5; ++i) io::co_spawn(ctx, consumer{ i, aq }, io::detached); std::cout << "RUN\n"; ctx.run(); return 0; } Is it a proper way to do so using timers? I think there should be a better way

3 2

Fin boost with cmake in config mode
by Alain O' Miniussi 15 Dec '23

15 Dec '23

Hi, I'd like to find Boost 1.84 from cmake 3.28 in config mode (https://cmake.org/cmake/help/latest/command/find_package.html#id6) My Boost distribution is in a non standard location <mypath> meaning, IF i UNDERSTAND CORRECTLY, that cmake will try to set Boost_DIR to <mypath>/lib/cmake/Boost-1.84.0/BoostConfig.cmake. Which environnement should I set so that it works ? Thanks ---- Alain Miniussi DSI, Pôles Calcul et Genie Log. Observatoire de la Côte d'Azur Tél. : +33609650665

2 1

Cobalt documentation error
by Josué Andrade Gomes 14 Dec '23

14 Dec '23

I’m seeing the following error while browsing the recently released Cobalt library documentation [1]: Failed to generate image: mmdc failed: Error: Failed to launch the browser process! /root/.cache/puppeteer/chrome/linux-1108766/chrome-linux/chrome: error while loading shared libraries: libatk-1.0.so.0: cannot open shared object file: No such file or directory TROUBLESHOOTING: https://pptr.dev/troubleshooting at Interface.onClose (file:///root/.nvm/versions/node/v18.18.1/lib/node_modules/@mermaid-js/mermaid-cli/node_modules/@puppeteer/browsers/lib/esm/launch.js:253:24) at Interface.emit (node:events:529:35) at Interface.close (node:internal/readline/interface:534:10) at Socket.onend (node:internal/readline/interface:260:10) at Socket.emit (node:events:529:35) at endReadableNT (node:internal/streams/readable:1368:12) at process.processTicksAndRejections (node:internal/process/task_queues:82:21) [1] https://www.boost.org/doc/libs/1_84_0/libs/cobalt/doc/html/index.html

1 0

Re: [Boost-users] Could sprintf be replaced with snprintf?
by Matt Borland 14 Dec '23

14 Dec '23

> On Dec 13, 2023, at 9:32 PM, Karsten Ahnert <karsten.ahnert(a)gmx.de> wrote: > > Yes, please go on. It would be great if odeint will be maintained in the future. Thank you! > > What are your GitHub user names? I can add you as maintainer but I want to be sure to use right name and avoid a potential name collision. > > Karsten Karsten, My GitHub username is mborland (https://github.com/mborland) and Nick is NAThompson (https://github.com/NAThompson) Let me know if you need anything else. Thanks, Matt

1 0

[release] Boost 1.84.0
by Marshall Clow 14 Dec '23

14 Dec '23

Release 1.84.0 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 contain two new libraries, numerous enhancements and bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/news/version_1.84.0> You can also download directly from: <https://boostorg.jfrog.io/artifactory/main/release/1.84.0/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

1 0

Re: [Boost-users] Could sprintf be replaced with snprintf?
by McGrath, Justin M 13 Dec '23

13 Dec '23

Has there been any movement on having someone else maintain ODEINT? I don't know that I would be of much use, but I'm willing to help where I can. There is one other issue that isn't critical, but it would save our group from having to do some hand editing of ODEINT for use with our project. Some of the paths are long enough that after they're included in our project they have nonportable lengths, requiring use to rename them. I made an issue last year: https://github.com/boostorg/odeint/issues/54. Changing the names would surely break code, and I don't know if this is a feasible change. Given that it's pretty easy for people to update include directives though, maybe it's not too intrusive. If it's a welcome change, I can submit a PR on GitHub. Best wishes, Justin ________________________________________ From: McGrath, Justin M <jmcgrath(a)illinois.edu> Sent: Monday, December 4, 2023 11:53 AM To: Matt Borland; Karsten Ahnert Cc: mario.mulansky(a)gmx.net; Nick Thompson Subject: Re: [Boost-users] Could sprintf be replaced with snprintf? Thank you everyone. It would be great if someone could continue managing the package. It's a great resource. Best wishes, Justin ________________________________________ From: Matt Borland <matt(a)mattborland.com> Sent: Friday, December 1, 2023 2:04 AM To: Karsten Ahnert Cc: McGrath, Justin M; mario.mulansky(a)gmx.net; Nick Thompson Subject: Re: [Boost-users] Could sprintf be replaced with snprintf? > On Nov 30, 2023, at 9:27 PM, Karsten Ahnert <karsten.ahnert(a)gmx.de> wrote: > > Merged the pull request. We are not actively maintaining the library anymore. > > But I will keep an eye on any upcoming changes. > Karsten, Thanks. Would you be interested in new maintainers stepping in for the library? Nick Thompson (cced) and I are maintainers on several other Boost libraries (math, multiprecision, random, and test), and we would be interested in helping out. He’s a mathematician, and I am a full-time Boost developer. If you would like to schedule a call or anything to discuss we can do that. Matt

3 2

coroutine condition_variable
by Keith Bennett 07 Dec '23

07 Dec '23

I'm using asio's awaitable. Couroutines are pretty neat. One of the things that keeps cropping up in the ability to notify another function that something has finished. In the past, I would use condition_variable and wait on that. Is there a better way to do that with coroutines? eg, I want to do something like: asio::awaitable<void> function(std::mutex& mtx, condition_variable& cv) { std::unique_lock lock{mtx}; // suspend this function until notified or 30 seconds expired auto expired = co_await cv.wait_until(lock, std::chrono::seconds(30)); if (expired) { // or something log("expired"); co_return; } do_some_work(); } then somewhere else I might do: asio::awaitable<void> somewhere_else(condition_variable& cv) { do_other_work(); cv.notify_one(); } I understand that it's a bad idea to hold a lock during co_await. What other problems prevent something like this from being created? Does something like this already exist? It's not clear from asio reference. I'm using boost 1.81.0 but I can upgrade if that is a problem -- Keith Bennett

3 8

[python] to_python_converter , is by value needed?
by MM 04 Dec '23

04 Dec '23

Hello, I have posted a question here some time ago, I thought to try here as well https://stackoverflow.com/questions/77552946/to-python-converter-is-by-valu… The community of experts in boost.python seems to have moved off to other concerns? Rds,

1 0

Could sprintf be replaced with snprintf?
by McGrath, Justin M 30 Nov '23

30 Nov '23

I am using some Boost libraries in a code base that does not want any use of sprintf. An automatic test flags any calls to it or vsprintf. Is it possible to replace all uses of sprintf with snprintf? I really doubt there are actually any security issues here, but I'm hoping this wouldn't be too difficult or cause any problems other than the effort to do it. Cheers, Justin

2 6

[Boost.Test] Saving Context Information for Failed Test Cases
by Bingtao Yin 16 Nov '23

16 Nov '23

I am a user of Boost.Test, and I am currently looking for a way to record some context information when dealing with failed test cases. Specifically, I would like to save certain variables to a file to facilitate debugging Could you please advise on any methods or recommendations within Boost.Test to fulfill this requirement? Are there any best practices or example code snippets that you could share? Thank you very much for your assistance! Best regards,

1 0

Re: [Boost-users] Problem with named_mutex on Windows
by David C. Partridge 15 Nov '23

15 Nov '23

I just realised it's not hanging - it's thrown an interprocess exception. I have revised my code to capture and report on that. I will let you know what it says. David From: David C. Partridge <david.partridge(a)perdrix.co.uk> Sent: 13 November 2023 14:16 To: 'boost-users(a)lists.boost.org' <boost-users(a)lists.boost.org> Subject: Problem with named_mutex on Windows I have a user reporting that the following code in my application's main() hangs unless he uses "Run as Adminstrator": ZTRACE_RUNTIME("Checking Mutex"); bip::named_mutex dssMutex{ bip::open_or_create, "DeepSkyStacker.Mutex.UniqueID.12354687" }; bip::scoped_lock<bip::named_mutex> lk(dssMutex, bip::defer_lock); const bool firstInstance{ lk.try_lock() }; ZTRACE_RUNTIME(" firstInstance: %s", firstInstance ? "true" : "false"); The trace shows "Checking mutex" and then it all stops. Is my code in error and if so what do I need to change? If not, how can I determine what the problem is? On a related issue: I think that this is C++ Exception safe, as the mutex will be unlocked and deleted. However, if a C exception occurs then how should I clean up? Is the named_mutex persistent over reboots? If so, where is it held (in case I need to do a manual cleanup). Many thanks David

1 1

Problem with named_mutex on Windows
by David C. Partridge 13 Nov '23

13 Nov '23

I have a user reporting that the following code in my application's main() hangs unless he uses "Run as Adminstrator": ZTRACE_RUNTIME("Checking Mutex"); bip::named_mutex dssMutex{ bip::open_or_create, "DeepSkyStacker.Mutex.UniqueID.12354687" }; bip::scoped_lock<bip::named_mutex> lk(dssMutex, bip::defer_lock); const bool firstInstance{ lk.try_lock() }; ZTRACE_RUNTIME(" firstInstance: %s", firstInstance ? "true" : "false"); The trace shows "Checking mutex" and then it all stops. Is my code in error and if so what do I need to change? If not, how can I determine what the problem is? On a related issue: I think that this is C++ Exception safe, as the mutex will be unlocked and deleted. However, if a C exception occurs then how should I clean up? Is the named_mutex persistent over reboots? If so, where is it held (in case I need to do a manual cleanup). Many thanks David

1 0

Optimizing serialization of std containers
by Gidi Gal 05 Nov '23

05 Nov '23

Hello, Are there any settings or additional code required to optimize the serialization of std containers ? I serialize a nested container: std::vector<std::deque<int>>. The max size of each deque entry is 20. I include boost/serialization/deque.hpp and boost/serialization/vector.hpp and I serialize the container in the following way: std::ofstream ofs(outFileName); boost::archive::binary_oarchive oa(ofs); oa << data; I created data with 10600 integers in the deque. The size of the serialized output file is 54493. Now, I test an alternate serialization. I serialized the size of the vector and then per each entry I serialize its size, which cannot be more than 20, so char is enough for that, next I serialize the integers in this entry. The size of the serialized output file is 43484. Is there a way to achieve better results for the default serialization ? Thanks, Gidi

1 0

why diagnostic_information is std::exception::what: Unknown exception
by Bernard 30 Oct '23

30 Oct '23

greetings kind regards may i please inquire how not to obtain "std::exception::what: Unknown exception" from diagnosic_inforumation() . my meaning is to inquire how to obtain as per example on boost web page https://www.boost.org/doc/libs/1_83_0/libs/exception/doc/tutorial_diagnosti… output : "std::exception::what: example_io error" id est where did "example_io error" come from as neither boost::exception nor std:::exception accept constructor string arguments . please my code below . thank you kindly #include "stl" // #includes all stl #include files #include "boost\exception\all.hpp" using namespace std; struct ceXception : virtual boost::exception, virtual std::exception { using this_type = ceXception; ceXception() {} auto what() { cerr << __FUNCSIG__ << endl; return string("return from " + string(__FUNCSIG__)); } template<typename charType> friend std::basic_ostream<charType>& operator<<(std::basic_ostream<charType>& _ostream, const this_type&) { cerr << "to cerr from " << __FUNCSIG__ << endl; _ostream << "to ostream from " << __FUNCSIG__ << endl; return _ostream; } }; void foo() { try { BOOST_THROW_EXCEPTION(ceXception()); } catch (ceXception& e) { cerr << boost::diagnostic_information(e); } } int main() { foo(); return 0; }

2 2

Async review scheduled for September 22, 2023 - October 2, 2023
by Mateusz Loskot 07 Sep '23

07 Sep '23

Hi, Following request from Nial and Klemens, we have scheduled new round of the Async review for September 22, 2023 - October 2, 2023 https://www.boost.org/community/review_schedule.html Best regards, -- Mateusz Loskot, on behalf of the Review Wizards

1 0

Error LNK1104 cannot open file 'boost_unit_test_framework-vc143-mt-x64-1_82.lib' cal_data_gain_pwr_test C:\Users\mushtaq.syed\Downloads\uhd-master\host\build\tests\LINK 1
by Mushtaq A. Syed, Ph.D. 28 Aug '23

28 Aug '23

Hi: My project uses the Boost library. I have installed C:\Program Files\Boost\boost_1_82_0. I also built using the bootstrap and .\b2 commands from the command window. This was because all the libboost libraries in C:\Program Files\Boost\boost_1_82_0\stage\lib were missing. Now when I build my code using Visual Studio 2022, I am getting the above error. I searched my Boost root folder and cannot find boost_unit_test_framework-vc143-mt-x64-1_82.lib; however, I do see libboost_unit_test_framework-vc143-mt-x64-1_82.lib and other libboost libraries but not a single boost library. I don’t know why it is looking for boost_unit_test_framework-vc143-mt-x64-1_82.lib and not libboost_unit_test_framework-vc143-mt-x64-1_82.lib. Could you please help resolve this? Thanks a lot! Cheers, Mushtaq ---------------------------- Mushtaq Syed, Ph.D. Principal Digital Signal Processing Engineer Verus Research [cid:image5fd716.JPG@ebfac5a4.47a0da54]<http://> Direct 505-396-7109 Cell 408-514-7821 6100 Uptown Blvd NE, Suite 260 Albuquerque, New Mexico 87110 verusresearch.net ---------------------------- NOTICE: This electronic mail message is intended exclusively for the individual or entity to which it is addressed. This message, together with any attachment, may contain sensitive or privileged information. Any unauthorized review, use, printing, retention, copying, disclosure, or distribution of said email is strictly prohibited. If you have received this message in error, please (1) immediately advise the sender by reply email message and (2) delete all copies of this message

2 3

Quadmath.h not found for float128 arm64 rocky linux
by David Frank 25 Aug '23

25 Aug '23

When compile with boost float128 on arm64 rocky linux, i got a failure of missing quadmath.h Thanks.

3 2

[Compiler] Boost compatibility in a untested compiler version
by Kankanamge, Gimhani 17 Aug '23

17 Aug '23

Hi team, Based on release notes for boost 1.83.0, there is a list of tested compilers (https://www.boost.org/users/history/version_1_83_0.html) But, we are going to use boost 1.83.0 in a different compiler which is not listed here(GCC 8.5.0). In such a case, what is the approach we should use to verify that boost is compatible in our given platform? Thank you. Gimhani Uthpala ------------------------------------------------------------------------------------------------------------ Please read these warnings and restrictions: This e-mail transmission is strictly confidential and intended solely for the ordinary user of the e-mail address to which it was addressed. It may contain legally privileged and/or CONFIDENTIAL information. The unauthorised use, disclosure, distribution and/or copying of this e-mail or any information it contains is prohibited and could, in certain circumstances, constitute a criminal offence. If you have received this e-mail in error or are not an intended recipient please inform London Stock Exchange Group (“LSEG”) immediately by return e-mail or telephone 020 7797 1000. LSEG may collect, process and retain your personal information for its business purposes. For more information please see our Privacy Policy. We advise that in keeping with good computing practice the recipient of this e-mail should ensure that it is virus free. We do not accept responsibility for any virus that may be transferred by way of this e-mail. E-mail may be susceptible to data corruption, interception and unauthorised amendment, and we do not accept liability for any such corruption, interception or amendment or any consequences thereof. Calls to London Stock Exchange Group may be recorded to enable LSEG to carry out its regulatory responsibilities. For more details on the LSEG group of companies click here London Stock Exchange Group plc 10 Paternoster Square London EC4M 7LS Registered in England and Wales No 05369106 ------------------------------------------------------------------------------------------------------------

2 1

JSON and no-alloc
by Marc Oscar Singer 14 Aug '23

14 Aug '23

Greetings, I'm targeting the boost JSON library for an embedded target. There appears to be one place where there could be either a beneficial new feature, or the feature exists and I'm not seeing it. The section about Avoiding Dynamic Allocation is close to what we'd like to see, except that we don't want to depend on a stack buffer for value data. All of the text of the JSON message is present in the string view. It would be desirable to reference the values from there. Let me be a little more explicit. We receive a message in JSON format. The whole of this message must be received before we can pass it to the JSON parser. It's /possible/ to let the JSON parser manage the message as it arrives and manage both the parse and storage of the content. Doing so would require shifting some responsibilities within the firmware that are difficult to change. We parse out the fields we care about and then want to hold onto these values for some time without retaining the memory necessary for the parse itself. Since all of the values and keys are present in the original source buffer passed to parse() as a string_view, we could simply save the string_views for the values and discard the JSON parser. Except, this parser copies the value to another buffer s.t. discarding the parser invalidates the value string_views. Alternatively, if the values themselves were returned as string_views into the source buffer, these string_views would (could) survive destruction of the parser. If we are missing the method by which this can be implemented with the current parser, we'd be delighted to hear it. Cheers -- /Marc Oscar Singer/ *Woollysoft* +1.206.328.1718

3 4

Abwesenheitsnachricht: JSON and no-alloc
by Sören Textor 14 Aug '23

14 Aug '23

Derzeit bin ich nicht im Hause Ihre E-Mail wird nicht weitergeleitet. In dringenden Fällen bitte support(a)ditec-gmbh.de oder Telefonhotline +49-6221-31698-110 oder die Zentrale +49-6221-31698-0 kontaktieren. Mit freundlichen Grüßen Dr. Sören Textor ----------------------------------------------- DiTEC Dr. Siegfried Kahlich & Dierk Langer GmbH Im Breitspiel 19 | 69126 Heidelberg | Germany Handelsregister | Mannheim | HRB 341229 Dieses Dokument ist vertraulich zu behandeln. Die Weitergabe, sowie Vervielfältigung, Verwertung und Mitteilung seines Inhalts ist nur mit unserer ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere für den Fall der Schutzrechtsanmeldung. This document has to be treated confidentially. Its contents are not to be passed on, duplicated, exploited or disclosed without our express permission. All rights reserved, especially the right to apply for protective rights.

1 0

Full-Text Search is LIVE!
by Vinnie Falco 10 Jul '23

10 Jul '23

Greetings. I am proud to announce that Mohammad’s excellent work on implementing a full-text search which looks into all the Boost libraries and their documentation is now complete, and has been published to the live website. You can access the search by pressing the Search button in the top right of the page: https://boost.org Please note that this is only the first iteration of this search tool and as such it will probably not give the perfect results that everyone expects every time. But now that we have something in place we can feedback, brainstorm on how to make it better, and iterate on it so that it evolves into something that consistently enhances the Boost user experience. To report problems or suggestions related to the search including the user interface, and the indexed contents, please open an issue in the Boost website repository: https://github.com/boostorg/website/issues There is also a “Report Issue” button in the search UI. Thanks!

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[Boost.TypeErasure] - Issue compiling under Windows with Embarcadero C++ Builder 11.3
by Andy Bell 07 Jul '23

07 Jul '23

Hi I'm using the type erasure library but have an issue (which I can workaround) when compiling in Windows 10 using Embarcadero C++ Builder 11.3. My problem is that C++ Builder brings in the Windows SDK Windows.h include file in every Windows VCL UI project it creates *before* any of my code has compiled and it's causing conflicts in boost header member11.hpp. This code is enough to cause the error: #include <boost/type_erasure/any.hpp> #include <boost/type_erasure/any_cast.hpp> #include <boost/type_erasure/builtin.hpp> #include <boost/type_erasure/operators.hpp> #include <boost/type_erasure/member.hpp> #include <boost/type_erasure/free.hpp> #include <boost/mpl/vector.hpp> namespace mynamespace { BOOST_TYPE_ERASURE_MEMBER(ReadStatus) } The error is because Windows.h defines 'interface' but this code from member11.hpp also uses 'interface': template<class P, template<class ...> class interface, class Sig, class Concept, class Base, class ID> using choose_member_interface = typename ::boost::mpl::if_c< ::boost::is_reference::value, typename ::boost::mpl::if_c< ::boost::type_erasure::detail::is_non_const_ref::value, interface<Sig, Concept, Base, const ID>, Base >::type, interface<Sig, Concept, Base, ID> >::type; and the compiler complains of conflicts. Embarcadero support have told me that I can't prevent Windows.h being included in my project before my boost-using code is compiled and attempts I've made to circumvent the problem, such as adding these lines to codegear.hpp: #ifdef interface #undef interface #endif don't work because C++ Builder is still including Windows.h before my code is compiled. To get around the problem, I changed member11.hpp in my boost installation to template<class P, template<class ...> class interface_, class Sig, class Concept, class Base, class ID> using choose_member_interface = typename ::boost::mpl::if_c< ::boost::is_reference::value, typename ::boost::mpl::if_c< ::boost::type_erasure::detail::is_non_const_ref::value, interface_<Sig, Concept, Base, const ID>, Base >::type, interface_<Sig, Concept, Base, ID> >::type; which I don't think will have side effects as 'interface/interface_' here is self-contained, but it doesn't feel like a good long term solution. Embarcadero support said: "Boost brings windows.h in because boost pulls it, *IF* the application is compiled for multi-threading then boost needs to access the OS threading functions, this is when you compile *without* the VCL." and I have confirmed this by creating a simple, multi-threaded Windows console application in C++ Builder... My question is: Is there a better way to work around this issue? My tests indicate that the Type Erasure library is working properly with my change, but it feels more like a hack than a fix... Thanks, Andy Bell Control Systems & Software Engineer Tel: +44 (0)1903 891700 Fax: +44 (0)1903 893888 Web: www.thermcosystems.com<http://www.thermcosystems.com/> www.csd-epi.com<http://www.csd-epi.com/> [cid:image002.png@01D9ADAA.693C8600] [Logo, company name Description automatically generated] P Please consider the environment before printing this email. This email and any files transmitted with it are confidential and intended solely for the intended recipient. If you are not the named addressee you should not disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of Tetreon Technologies Limited. Warning: Although Tetreon Technologies Limited has taken reasonable precautions to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments. Tetreon Technologies Ltd is a limited company registered in England and Wales. Company Registration No. 4966845 Registered Offices: Highfield, Rock Road, Washington, West Sussex, RH20 3BH, England

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[asio] monitoring io_context load
by Dmitry 07 Jul '23

07 Jul '23

Hello, I would like to have a metric that measures time spent for work (executing completion handlers) vs time spent waiting for work in thread pool executing io_context::run(). It will help to estimate service capacity (i.e. how many more requests per second it can handle). It is similar to the system's CPU usage metric but CPU usage metric does not include waiting for mutex locks or sync io performed from completion handlers. In our performance tests io_context becomes overloaded (the queue grows faster than it's processed) when CPU usage is about 85%. I would like to have a metric that shows 100% in this case. There is BOOST_ASIO_CUSTOM_HANDLER_TRACKING macro that allows to intercept handler invocations and to measure execution time. But in the case of many lightweight handlers measuring time can bring significant overhead. I'm considering adding similar macros before and after waiting for the condition variable and epoll to measure wait time and then calculate execution time. I'm writing to ask if there is a better alternative? If not, would you be interested in a patch that adds "Handler Tracking" macros around wait calls? Thank you, Dmitry

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Please remove me from this list
by Vitaly Budovski 03 Jul '23

03 Jul '23

The web and email unsubscribe methods do not seem to work.

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[python][shared_ptr_from_python.hpp] looks like copy/paste or merge error
by Ran Regev 29 Jun '23

29 Jun '23

Hi, The code in construct() seems to surfer from copy/paste or merge error. It seems as though the following lines are duplicated in the else clause: void *const storage = ((converter::rvalue_from_python_storage<SP<T> >*)data)->storage.bytes; // Deal with the "None" case. if (data->convertible == source) new (storage) SP<T>(); Please take a look at: https://www.boost.org/doc/libs/1_82_0/boost/python/converter/shared_ptr_fro… Ran.

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[multiprecision] why 128 bit numbers isn't used in msvc?
by shar yashuv Giat 29 Jun '23

29 Jun '23

msvc added 128 bit numbers(in the header __msvc_int128.hpp). I know multiprecision uses __128 to improve performance so why doesn't it use msvc version? it's seems easy to change and will probably improve performance.

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assign a large integer to a cpp_int
by Matthew Mawson 27 May '23

27 May '23

I want to assign a large number to a cpp_int variable like this: cpp_int large = 30414093201713378043612608166064768844377641568960512000000000000; and I get this: error: integer literal is too large to be represented in any integer type. Thanks!

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Abwesenheitsnachricht: assign a large integer to a cpp_int
by Sören Textor 27 May '23

27 May '23

Derzeit bin ich nicht im Hause Ihre E-Mail wird nicht weitergeleitet. In dringenden Fällen bitte support(a)ditec-gmbh.de oder Telefonhotline +49-6221-31698-110 oder die Zentrale +49-6221-31698-0 kontaktieren. Mit freundlichen Grüßen Dr. Sören Textor ----------------------------------------------- DiTEC Dr. Siegfried Kahlich & Dierk Langer GmbH Im Breitspiel 19 | 69126 Heidelberg | Germany Handelsregister | Mannheim | HRB 341229 Dieses Dokument ist vertraulich zu behandeln. Die Weitergabe, sowie Vervielfältigung, Verwertung und Mitteilung seines Inhalts ist nur mit unserer ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere für den Fall der Schutzrechtsanmeldung. This document has to be treated confidentially. Its contents are not to be passed on, duplicated, exploited or disclosed without our express permission. All rights reserved, especially the right to apply for protective rights.

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[boost::locale::generator] Calling boost::locale::generator results in an exception in EnterCriticalSection
by M L 24 May '23

24 May '23

Hello, calling boost::locale::generator results in an exception in EnterCriticalSection. Does anybody have a hint to the cause of this problem? Every small clue is welcome. What could be a possible workaround? What is usually the reason for an exception in EnterCriticalSection? Code snippet: boost::locale::generator generator; generator.add_messages_path("..."); generator.add_messages_domain(".."); std::string lngCode = "en"; std::locale = generator(lngCode + ".WINDOWS-1252"); // this line crashes -> 0x0000005 EnterCriticalSection Boost Version: (boost_1_60_0) Visual Studio 2013 Some more hints: - it seems that there is a problem reading the translation file, which works fine in other applications. - there are no threads in the code - the problem is project dependent. Same code works in a different project. - the problem only appears if a specific header is included, but nothing in this header is ever executed before the crash. Removing the header/cpp removes the problem. - some C code is present in the code - the problem even appears when moving the snipped in main. Thanks for help.

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Boost ASIO: Problems building a conditional variable using io_context / strand
by Suraaj K S 23 May '23

23 May '23

Hi all, In boost-asio, I realized that there was no easy way to have something that resembles a condition variable. However, I realized that I could get something very similar using stackful coroutines ( https://www.boost.org/doc/libs/1_66_0/doc/html/boost_asio/overview/core/spa…) while using an io_context as a 'queue' for completion tokens. Below is my approach: *#include "asio_types.hpp"#include <atomic>#include <iostream>class async_pending_queue {public: async_pending_queue() : pending_handlers_(0), strand_(pending_queue_), wg_(asio::make_work_guard(pending_queue_)) {} template <typename CompletionToken> auto async_submit( CompletionToken &&token, std::function<void(void)> atomic_action = [] {}) { auto init = [this, &atomic_action](auto completion_handler) { auto posted_lambda = [handler = std::move(completion_handler), this]() mutable { pending_handlers_--; asio_sys_err ec; handler(ec); }; post(strand_,std::move(posted_lambda)); pending_handlers_++; atomic_action(); }; return asio::async_initiate<CompletionToken, void(asio_sys_err)>(init, token); } int pending_count() { return pending_handlers_.load(); } // It may not run 1 and run 0 bool try_run_one() { auto cnt = pending_queue_.poll_one(); std::cout << "completion token result" << cnt << std::endl; bool ret = (cnt == 1); return ret; }private: std::atomic<unsigned int> pending_handlers_; asio_ioctx pending_queue_; asio_ioctx::strand strand_; decltype(asio::make_work_guard(pending_queue_)) wg_;};* Here, one simply uses calls `my_async_pending_queue.async_submit(yield)`, if calling from a stackful coroutine. The coroutine can be continued by calling `my_async_pending_queue.try_run_one()`. Using this, I wanted to build a 'memory checker'. It has two functions -> `request_space` and `free_space`. A coroutine calls `request_space`, which may block if there is no space left. Meanwhile, another thread / coroutine can call `free_space`, which will run blocked coroutines if possible. I built a toy memory checker wrapper as follows: *#ifndef MEM_CHECK_HPP#define MEM_CHECK_HPP#include <cstddef>#include <mutex>#include <queue>#include <boost/asio.hpp>#include <boost/asio/spawn.hpp>namespace asio = boost::asio;using asio_ioctx = asio::io_context;using asio_sys_err = boost::system::error_code;using asio::yield_context;#include "async_pending_queue.hpp"class MemoryChecker {public: using bytes_cnt = size_t; MemoryChecker(asio_ioctx &ioctx, bytes_cnt total_mem = 1024, bytes_cnt initial_fill = 0); // This requests some space, and possibly yields; void request_space(bytes_cnt cnt, yield_context yield); void free_space(bytes_cnt cnt);private: bytes_cnt get_available_mem(); const bytes_cnt total_mem_; bytes_cnt mem_used_; std::queue<bytes_cnt> request_queue_; async_pending_queue request_routines_; std::mutex lock_; asio_ioctx::strand fifo_strand_; asio_ioctx &completion_ioctx_;};inline MemoryChecker::MemoryChecker(asio_ioctx &ioctx, bytes_cnt total_mem, bytes_cnt initial_fill) : total_mem_(total_mem), mem_used_(initial_fill), request_queue_{}, lock_{}, request_routines_{}, completion_ioctx_(ioctx), fifo_strand_(ioctx) {}inline MemoryChecker::bytes_cnt MemoryChecker::get_available_mem() { assert(total_mem_ >= mem_used_); return total_mem_ - mem_used_;}inline void MemoryChecker::request_space(bytes_cnt cnt, yield_context yield) { // if (cnt > total_mem_) throw logic_error lock_.lock(); assert(cnt <= total_mem_); assert(cnt > 0); if (request_queue_.empty()) { assert(request_routines_.pending_count() == 0); if (get_available_mem() >= cnt) { // We bypass the pending queue mem_used_ += cnt; lock_.unlock(); return; } } assert(request_queue_.size() == request_routines_.pending_count()); std::cout << "Pushing " << cnt << std::endl; request_queue_.push(cnt); auto wg = asio::make_work_guard(completion_ioctx_); request_routines_.async_submit(yield, [this] { lock_.unlock(); }); auto oldest_req{request_queue_.front()}; assert(cnt == oldest_req); request_queue_.pop(); mem_used_ += cnt; assert(request_queue_.size() == request_routines_.pending_count()); asio::post(fifo_strand_, yield);}inline void MemoryChecker::free_space(bytes_cnt cnt) { { std::lock_guard<std::mutex> lg{lock_}; mem_used_ -= cnt; // Here, we own the lock, and free as many coroutines as we can while (true) { if (request_queue_.size() == 0) { std::cout << "No pending requests. Bailing" << std::endl; break; } assert(request_queue_.size() == request_routines_.pending_count()); auto oldest_req{request_queue_.front()}; auto available_mem{get_available_mem()}; if (available_mem < oldest_req) { std::cout << "Oldest request is larger than available_mem. Bailing" << std::endl; break; } assert(request_routines_.try_run_one() == true); } }}#endif /* MEM_CHECK_HPP */* Here is a test program that can run it: *#include "mem_check.hpp"#include <thread>#include <unistd.h>constexpr size_t mc_size{4};asio_ioctx ioctx;size_t total{0};MemoryChecker mc{ioctx, mc_size};void requestor_coroutine(size_t rq,yield_context yield) { asio::steady_timer t(ioctx); while (true) { total += rq; mc.request_space(rq, yield); std::cout << "Got requested space "; asio_sys_err ec; }}int main() { asio::spawn(ioctx, [](yield_context yield) { requestor_coroutine(1,yield); }); asio::spawn(ioctx, [](yield_context yield) { requestor_coroutine(2,yield); }); asio::spawn(ioctx, [](yield_context yield) { requestor_coroutine(3,yield); }); asio::spawn(ioctx, [](yield_context yield) { requestor_coroutine(4,yield); }); std::thread t([] { ioctx.run(); }); while (true) { getchar(); std::cout << total << std::endl; if (total > 0) { std::cout << "freeing" << std::endl; mc.free_space(1); total -= 1; } } t.join();}* Finally, the problem we face is as follows. When we run the program, the assertion `total_mem >= mem_used_` fails. On some further investigation, I realized that our completion token was being called even when we do not call `try_run_one`, which was very weird. Finally, somewhat more surprisingly, If I replace *post(stand_,std::move(posted_lambda));* by *post(pending_queue_,std::move(posted_lambda));*, things seem to work. However, the asio documentation says that only strands guarantee a FIFO execution order. I am not sure if using a simple `io_context` will work as a FIFO queue (even though it seems to in these examples). Any inputs would be helpful - I am happy to hear the problem in this implementation, as well as other implementations (for example, using a std::queue as a proper queue instead of this io_context hack). This question has also been posted here: https://stackoverflow.com/questions/76310252/c-boost-asio-building-a-condit… . Thanks, Suraaj

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Re: [Boost-users] New Website !
by Vinnie Falco 11 May '23

11 May '23

On Thu, May 11, 2023 at 8:08 AM Damien via Boost-users <boost-users(a)lists.boost.org> wrote: > This looks really good. Congratulations to the team. Thank you very much for the kind words! Regards

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Re: [Boost-users] New Website !
by Damien 11 May '23

11 May '23

This looks really good. Congratulations to the team. Damien

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