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13 Mar '20

Hello I want a collection to store a relationship N to M like so: Item of type A Item of type B A1 B1,B2,B3 A2 B4 A3 B1 and I would like a convenient way to get from a A instance to the list of B instances, and vice versa, from a given B instance to the list of A instances. At runtime, the A objects are created first, then a list of B objects is created. Later, B objects get modified asynchronously and that modification need to update the relevant A instances what container to use? boost::bimap< unordered_set<A*> , unordered_set<B*> > ?

3 2

Failing to build Boost
by MANAV KUMAR 13 Mar '20

13 Mar '20

Hi , I am Manav Kumar. I was trying to install boost version 1.72 on my system Mac OSX. But after installing the package from it’s website and running the ./bootstrap.sh command while being in it’s directory I am getting the following error :- ' Building Boost.Build engine with toolset clang… Failed to build Boost.Build build engine Consult ‘bootstrap.log’ for more details. ‘ And I am hardly able to understand the bootstrap.log file to figure out the problem. Somebody please help me with it. Regards Manav

2 1

shared memory objects limitation in Windows 10
by Shen, Chang (MSFC-EV43) 11 Mar '20

11 Mar '20

Hi All I am testing my class using boost. The class has a shared_memory_object member : class X { char* m_buffer; boost::interprocess::shared_memory_object *m_sram; public X(char *name) { m_buffer = (char*)malloc(128); m_sram = new(std::nothrow) boost::interprocess::shared_memory_object(boost::interprocess::open_or_create_t, name, boost::interprocess::mode_t::read_write); } } int main() { std::vector<X*> xlist; for(int i=0;i<1500;i++) { std::string name = std::to_string(i); X *x = new(std::nothrow) (name.c_str()); xlist.push_back(x); } return 0; } I test the class in Window 10 using MinGW 32bit compiler. g++ (MinGW.org GCC-8.2.0-3) 8.2.0 Copyright (C) 2018 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. I find that I only can create 1463 X objects. 1464th object will throw exception: Dynamic exception type: boost::interprocess::interprocess_exception std::exception::what: WinApi FormatMessage returned error. Why this limitation?

2 1

[Process] Hardcoding the command for shell
by Frederick Gotham 11 Mar '20

11 Mar '20

At the command line on most operating system, you can pipe a file into another program and then pipe out into a third program. For example: Take a file from the hard disk, decrypt it, and then unzip it: openssl rc4-40 -salt -d -pass pass:MyPassword < /home/frederick/monkey.tar.gz.encrypted > tar -zxf - I realise, when using Boost::Process, that we can tie the input and output streams of child processes together using 'ipstream', but I want to be able to take the above command and give it directly to the operating system (or to the 'shell'). On Linux x64 and armhf(32-Bit), the following works: child c(search_path("sh"), "-c", "openssl rc4-40 -salt -d -pass pass:MyPassword < /home/frederick/monkey.tar.gz.encrypted > tar -zxf -" ); But should I have to hardcode "sh" and "-c" into my program like that? I have tried using "shell" like this: child c( "openssl rc4-40 -salt -d -pass pass:MyPassword < /home/frederick/monkey.tar.gz.encrypted > tar -zxf -", shell ); but this doesn't work on either Linux x64 or armhf(32-Bit). I thought the whole point of "shell" was that you didn't have to hardcode "sh -c" in Linux or "cmd /c" in MS-Windows. Also if you do some web-searching for how to run a batch file in MS-Windows using boost::process, you'll see that everyone is doing this: context ctx; ctx.environment = self::get_environment(); child c = launch("cmd", "/c batch.bat", ctx); Should it be necessary to hardcode "cmd /c" like that? Shouldn't this all be taken care of by "boost::process::shell"? Frederick

2 2

[SPAM] Boost Library on Samsung A71(SM-A715F/DS) TLS handshake connection problem
by sean chang 10 Mar '20

10 Mar '20

Hi , Here comes look like a boost library connection problem on a mobile device. The SSL handshake connection problem failures happen on a new smart phone device: Samsung A71 with Android 10. Compare Devices: Pixel 3a (Android 10), Samsung A51(Android 10) or lower than Android 10 devices—> working great without problem We are design an SDK integrated Boost C++ Library with openssl for API calls, but not sure what happen on this mobile phone about boost library connection problem and reason, we are looking for solution or work around to fix this problem. Thanks a lot. below is the information what we get from boost debug. Tested Boost version: 1.67.0~1.71.0 Tested openssl: 1.0.2h and 1.1.1 Situation(1): The SSL connection is possible make connection wait for 30 sec, then we will receive system: 125 error code. attached Log file: 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][handshake][146]: Arthur: SSL 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249]: Arthur: SSL 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_connect][339]: Arthur: SSL 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(2) 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][298]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/vakten: Canceled 1 number of waiters 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][handshake][146]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_connect][339]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(2) 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][304]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_connect_timeout(const boost::system::error_code&) 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/vakten: Connect timeout aborted 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:12.722 32722-32730/com.keypasco.vaktensample I/co.vaktensampl: Compiler allocated 4266KB to compile void android.view.ViewRootImpl.performTraversals() 2020-03-10 21:02:13.811 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_handshake_timeout(const boost::system::error_code&) 2020-03-10 21:02:13.811 32722-390/com.keypasco.vaktensample D/vakten: Handshake timed out 2020-03-10 21:02:13.813 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::Socket::shutdown(boost::system::error_code&) 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][shutdown][153]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_shutdown][345]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(1) 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][262]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][map_error_code][209]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/vakten: error:140E0197:lib(20):func(224):reason(407) 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample D/vakten: Socket.shutdown error asio.ssl error 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample V/vakten: + boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::executor>::lowest_layer_type& kp::web::Socket::lowest_layer() 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample V/vakten: + kp::web::Socket::~Socket() 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][~engine][66]: Arthur: SSL 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][~engine][74]: Arthur: SSL_free 2020-03-10 21:02:13.816 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.816 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/impl/context.ipp][~context][394]: Arthur: SSL 2020-03-10 21:02:13.816 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/impl/context.ipp][~context][428]: Arthur: SSL_CTX_free 2020-03-10 21:02:13.816 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.818 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::invoke_handler(boost::exception_ptr) 2020-03-10 21:02:13.818 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::WebClientImpl::handle_connect(boost::exception_ptr) 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: | + void kp::web::WebClientImpl::invoke_handler(boost::exception_ptr) 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: | | + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: | | / 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: | / 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][map_error_code][209]: Arthur: SSL 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_handshake(const boost::system::error_code&) 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample D/vakten: Canceled 0 number of waiters 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample E/vakten: system:125 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.821 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.822 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.823 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.823 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.824 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::invoke_handler(boost::exception_ptr) 2020-03-10 21:02:13.824 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.825 32722-390/com.keypasco.vaktensample V/vakten: + boost::asio::io_service& kp::web::WebClientImpl::get_io_service() 2020-03-10 21:02:13.825 32722-390/com.keypasco.vaktensample V/vakten: + boost::asio::io_service& kp::web::ClientConnection::get_io_service() 2020-03-10 21:02:13.825 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.825 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.827 32722-390/com.keypasco.vaktensample I/vakten: KspNetworkException: SSL Connect_timeout(30). 2020-03-10 21:02:13.830 32722-390/com.keypasco.vaktensample V/vakten: + kp::client_api::v5::AppClient::~AppClient() 2020-03-10 21:02:13.830 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.830 32722-390/com.keypasco.vaktensample V/vakten: + kp::client_api::ApiClient::~ApiClient() 2020-03-10 21:02:13.830 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: + kp::web::WebClient::~WebClient() 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: + kp::web::WebClientImpl::~WebClientImpl() 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: + kp::web::ClientConnection::~ClientConnection() 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.832 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.832 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.842 32722-32722/com.keypasco.vaktensample D/GetTasksFragment: Task list: [] Situation(2) When a launched app been SSL connection success. Press power button and turn on again. then the boost library will happen connection problem with system 2 error code, it can be happen many times until boost re-initial. attached Log: 2020-03-09 18:09:53.309 11748-11800/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_connect(const boost::system::error_code&) 2020-03-09 18:09:53.309 11748-11800/com.keypasco.vaktensample V/vakten: + kp::web::ProxySetting::Type kp::web::ProxySetting::get_type() const 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: + static boost::shared_ptr<kp::web::WebProxy> kp::web::WebProxy::create(kp::web::ProxySetting::Type) 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: | + kp::web::NullProxy::NullProxy() 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: | / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: + boost::asio::ip::tcp::socket& kp::web::Socket::get_socket() 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: + virtual void kp::web::NullProxy::connect(boost::asio::ip::tcp::socket&, const kp::web::ProxySetting&, const kp::web::Uri&) 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: + bool kp::web::Socket::is_ssl_socket() const 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][handshake][146] 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249] 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_connect][339] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(2) 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][298] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/vakten: Canceled 1 number of waiters 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][map_error_code][209] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_handshake(const boost::system::error_code&) 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/vakten: Canceled 1 number of waiters 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample E/vakten: system:2 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample V/vakten: | + void kp::web::Socket::shutdown(boost::system::error_code&) 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][shutdown][153] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_shutdown][345] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(1) 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][262] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][map_error_code][209] 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | / 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample D/vakten: | error:140E0197:lib(20):func(224):reason(407) 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample D/vakten: | Socket.shutdown error asio.ssl error 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | + boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::executor>::lowest_layer_type& kp::web::Socket::lowest_layer() 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | / 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | + kp::web::Socket::~Socket() 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][~engine][66]: Arthur: SSL 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][~engine][74]: Arthur: SSL_free 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | /

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Question about Boost::Interprocess::Allocators.
by Da Xu 09 Mar '20

09 Mar '20

Hi folks, I got a question about the boost::interprocess::allocators. I am a little confused as to when to use the standard shared memory allocator, and when to use node_allocator, or any of the other ones. What's the advantage and disadvantage of each? I read through the documentation, but it's not making a whole lot of sense. I am mainly using the allocators with the spsc_queue to transfer objects around, which may contain vectors floats or strings. One thing also confused me a little is that the non-standard shared memory allocators are all marked as not thread safe? I am not sure what does this mean. I assume these allocators will be interprocess safe? As in, I don't need to lock the shared memory to allocate memory, right? Maybe it means I can't share these allocators between threads in the same process? Any thoughts/tips would be greatly appreciated. Thank you. Da.

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Boost.Test failing to compare std::basic_string<char8_t> strings
by Leo Carreon 09 Mar '20

09 Mar '20

Hi Boost.Users, I’m using Boost.Test from Boost 1.72.0 and I’m getting a failure when I perform the following test: auto string_1 = u8”value”s; auto string_2 = u8”value”s; BOOST_TEST(string_1 == string_2); However, the problem goes away when I change the test line to: BOOST_TEST((string_1 == string_2)); What is the reason why Boost.Test is failing without the double parentheses? Kind regards, Leo

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[date-time] USE_DATE_TIME_PRE_1_33_FACET_IO to be removed in next release
by Jeff Garland 06 Mar '20

06 Mar '20

In case you've not checked the calendar (see below) it's 2020 and a the c++ world has moved on from the issue this macro solved. boost date-time also needs to move forward into the decade with a modernized all header code base . If you're dependent on this macro for any reason I'd like to hear about it. Thanks, Jeff using namespace boost::gregorian; date today = day_clock::local_day(); cout << today.year() << endl; //2020 ;)

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uBlas and Google Summer of Code 2020
by David Bellot 06 Mar '20

06 Mar '20

Hi Boost community, I've added new projects for the Google Summer of Code 2020 for the Boost uBlas library (matrix computations, tensors and linear algebra). If you're a student and wish to candidate, please contact me as soon as possible. The list of projects is here: https://github.com/boostorg/wiki/wiki/Google-Summer-of-Code%3A-2020 Cheers, David

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[mp11][mpl] Recurse over type list using mp11's mp_rest
by deb 06 Mar '20

06 Mar '20

Hello, I am currently learning about mp11 from the docs . While mpl had an iterator functionality to get an alias over a type in mp_list it seemed mp11's mp_rest could be used for a similar task. So I coded up a simple example of recursing over a type list based on some type check , but am quite lost trying to make it work . So a possible pseudo code for the above might be template<typename list> struct recurse{ using rest_of_list=mp_rest<list>; using type = typename std::conditional< mp_empty<rest_of_list>::value, base type here on empty list, typename std::conditional< some "loop" break condition, type on true condition, typename recurse< rest_of_list >::type >::type >::type; } Is this even possible or there exists some other method to do the same in mp11. Thanks. -- Sent from: http://boost.2283326.n4.nabble.com/Boost-Users-f2553780.html

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