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Help needed in learning to use Boost.Asio
by Osman Zakir 24 Oct '17

24 Oct '17

I want to learn how to use Boost.Asio so I can then create an abstraction layer over it for HTTP and create a server and client. I need it for a web app I want to make. I know C++ isn’t a good choice for this sort of thing, but it’s still growing and getting better, so I wonder if there’s really no hope for it becoming a better choice for web development. Especially if someone were to propose a networking library for boost that also provides support for the HTTP protocol and maybe also RESTful services out of the box. Libraries in Boost have a high chance of making it into the standard, after all, so this could be a good idea. I’ve heard from many people that C++ is a waste of time, especially if one wants to get into web development and make a lot of money. Most people who want to web development are abandoning C++ in favor of languages Python that provide better support for web development. I don’t like this and I hope that C++ will also become better for the job soon so that it can pull back programmers that have left it for other languages. That’s also the reason why I want to use C++ here. I’m hoping that the Networking TS would be standardized and that the standardizing committee would also do something to make C++ overall better for the web, preferably as good as Python if possible. The difficulty of getting into and using C++ is also overly-exaggerated but it seems to be more because of C++ programmers not making their code simple and beautiful enough, so it’s also the language users’ fault. I want to try to change the negative views that people have of C++, as well. By the way, would it be a good idea to send an email asking about the future of C++, especially for web development, to Dr. Stroustrup if I can find a way to contact him? I know he’s a busy man and I’m also reluctant to this, but since he’s also on the standard-making committee, if he finds some free time to reply to my email, he should be able to tell me what to expect about C++ and its future. I’m sorry if this email got too long, though. Best regards. Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

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boost asio
by Sharma, Nishant 23 Oct '17

23 Oct '17

Hi, I have created an Asynchronous TCP server and client and it works fine. Since it is asynchronous, it uses API's like async_read, async_write etc.. Is it possible that the same code be used to do "synchronous" communication which results in blocking any further task in the queue unless the current i/o task is complete ? I have attached the example hereby. It has two folder for server and client.. First the server needs to be run and then the client. Best Regards, Nishant Sharma

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boost fileystem issue
by Olivier Tristan 20 Oct '17

20 Oct '17

Hi Guys, I would like to bump this particular issue that is quite annoying for me. Basically it crashes as soon as you call boost::filesystem::exists in the ctor of a static variable initialized at program startup https://svn.boost.org/trac10/ticket/12987 Looks like there was a fix 4 month ago but this hasn't been pushed into the trunk yet Any idea how to push the process forward ? Thanks ! -- Olivier Tristan Research & Development www.uvi.net

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Reconnecting a SSL socket correctly
by David Demelier 18 Oct '17

18 Oct '17

Hello, I'm trying to reconnect a SSL socket (using ssl::stream with tcp::socket) that has been closed only remotely. It looks like a shutdown on my client causes "stream truncated" error so I have no idea how can I connect my client socket again. I was thinking of just creating a new instance but the stream class is not copyable. Do you have any recommandations? Regards, -- David

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[asio] null reference in epoll_reactor
by Phil Sean 18 Oct '17

18 Oct '17

Hi, Running the tutorial async TCP server (http://www.boost.org/doc/libs/1_65_1/doc/html/boost_asio/tutorial/tutdaytim…) or any other asynchronous operation in valgrind yields an error like this: = Syscall param epoll_pwait(sigmask) points to unaddressable byte(s) = epoll_pwait (in /usr/lib/libc-2.26.so) = boost::asio::detail::epoll_reactor::run(bool, boost::asio::detail::op_queue<boost::asio::detail::task_io_service_operation>&) (in /.../server) = boost::asio::detail::task_io_service::do_run_one(boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>&, boost::asio::detail::task_io_service_thread_info&, boost::system::error_code const&) (in /.../server) = boost::asio::detail::task_io_service::run(boost::system::error_code&) (in /.../server) = boost::asio::io_service::run() (in /.../server) = main (in /.../server) = Address 0x0 is not stack'd, malloc'd or (recently) free'd I suspect it's due to some recent changes because it didn't use to be an error. Boost version is 1.65.1(Arch Linux). Thank you.

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git clone of boost
by Tim Burgess 18 Oct '17

18 Oct '17

Hi, Just been trying to find the address to clone boost, but was unsuccessful. Can anybody help me out please? Best wishes. Tim Burgess

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Re: [Boost-users] Many undefined references for libboost_filesystem
by Mahmood N 17 Oct '17

17 Oct '17

Hi Daniel, I tried some other versions based on the release date of the project and boosts. I tried 1.38 and 40 and 42 and 44 and 46. All of them return some undefined references. How can i find which boost version is used in the project? Regards, Mahmood -------------------------------------------- On Sat, 10/14/17, Daniel Anderson <wonixen(a)gmail.com> wrote: Subject: Re: [Boost-users] Many undefined references for libboost_filesystem To: boost-users(a)lists.boost.org Cc: "Mahmood N" <nt_mahmood(a)yahoo.com> Date: Saturday, October 14, 2017, 12:53 AM you are probably using the wrong version of filesystem, or maybe of boost. often those projects need a specific boost version. 2017-10-13 14:24 GMT-04:00 Mahmood N via Boost-users <boost-users(a)lists.boost.org>: > Hi, > > I am trying to build a suite as described at > https://github.com/gpgpu-sim/ispass2009-benchmarks > > Some of the benchmarks use boost. For example, AES/Makefile has > > > > LINKFLAGS := -L$(BOOST_LIB) -lboost_filesystem > > > > Also, the Makefile.ispass-2009 in the root folder has the following settings > > > > SETENV=export BINDIR=$(BINDIR); \ > > export ROOTDIR=$(NVIDIA_COMPUTE_SDK_LOCATION)/C/src/; \ > > export BINSUBDIR=$(BINSUBDIR); \ > > export BOOST_LIB=/home/mahmood/boost_1_46_0/lib; \ > > export BOOST_ROOT=/home/mahmood/boost_1_46_0/include; \ > > export BOOST_VER=""; \ > > export OPENMPI_BINDIR=/usr/bin/; > > > > > > I manually built boost_1_46_0 with the steps described at > http://www.boost.org/doc/libs/1_46_1/doc/html/bbv2/installation.html > > The installations was successful and I can see lib/ and include/ folders > > > > mahmood@vb:boost_1_46_0$ find lib -name libboost_system* > > lib/libboost_system.so.1.46.0 > > lib/libboost_system.so > > lib/libboost_system.a > > mahmood@vb:boost_1_46_0$ find lib -name libboost_filesystem* > > lib/libboost_filesystem.so > > lib/libboost_filesystem.a > > lib/libboost_filesystem.so.1.46.0 > > > > > > > > However, as I run “make -f Makefile.ispass-2009”, I get many undefined > errors about libboost_filesystem. Please see below > > > > > > > > export > BINDIR=/home/mahmood/gpgpu-sim_distribution/ispass2009-benchmarks/bin/; > export ROOTDIR=/home/mahmood/NVIDIA_GPU_Computing_SDK/C/src/; export > BINSUBDIR=release; export BOOST_LIB=/home/mahmood/boost_1_46_0/lib; export > BOOST_ROOT=/home/mahmood/boost_1_46_0/include; export BOOST_VER=""; export > OPENMPI_BINDIR=/usr/bin/; make noinline=0 -C AES > > make[1]: Entering directory > `/home/mahmood/gpgpu-sim_distribution/ispass2009-benchmarks/AES' > > obj/x86_64/release/aesCudaUtils.cpp.o: In function > `readFromFileForm(boost::filesystem3::path&, std::vector<unsigned int, > std::allocator<unsigned int> >&)': > > aesCudaUtils.cpp:(.text+0x97d): undefined reference to > `boost::filesystem3::detail::status(boost::filesystem3::path const&, > boost::system::error_code*)' > > obj/x86_64/release/aesCudaUtils.cpp.o: In function > `readFromFileNotForm(boost::filesystem3::path&, char*, unsigned int)': > > aesCudaUtils.cpp:(.text+0xe81): undefined reference to > `boost::filesystem3::detail::status(boost::filesystem3::path const&, > boost::system::error_code*)' > > obj/x86_64/release/aesCudaUtils.cpp.o: In function > `getFileSize(boost::filesystem3::path&)': > > aesCudaUtils.cpp:(.text+0x1244): undefined reference to > `boost::filesystem3::detail::status(boost::filesystem3::path const&, > boost::system::error_code*)' > > aesCudaUtils.cpp:(.text+0x1257): undefined reference to > `boost::filesystem3::detail::file_size(boost::filesystem3::path const&, > boost::system::error_code*)' > > obj/x86_64/release/aesCudaUtils.cpp.o: In function > `initAesCuda(std::basic_string<char, std::char_traits<char>, > std::allocator<char> >, unsigned char*, unsigned int, > std::basic_string<char, std::char_traits<char>, std::allocator<char> >, > char*, unsigned int)': > > aesCudaUtils.cpp:(.text+0x1c54): undefined reference to > `boost::filesystem3::path::wchar_t_codecvt_facet()' > > aesCudaUtils.cpp:(.text+0x1cab): undefined reference to > `boost::filesystem3::path::wchar_t_codecvt_facet()' > > aesCudaUtils.cpp:(.text+0x1ce5): undefined reference to > `boost::filesystem3::detail::status(boost::filesystem3::path const&, > boost::system::error_code*)' > > aesCudaUtils.cpp:(.text+0x1d02): undefined reference to > `boost::filesystem3::detail::status(boost::filesystem3::path const&, > boost::system::error_code*)' > > obj/x86_64/release/aesCudaUtils.cpp.o: In function > `_GLOBAL__sub_I_aesCudaUtils.cpp': > > aesCudaUtils.cpp:(.text.startup+0x2b): undefined reference to > `boost::system::generic_category()' > > aesCudaUtils.cpp:(.text.startup+0x37): undefined reference to > `boost::system::generic_category()' > > aesCudaUtils.cpp:(.text.startup+0x43): undefined reference to > `boost::system::system_category()' > > obj/x86_64/release/aescuda.cpp.o: In function `_GLOBAL__sub_I_aescuda.cpp': > > aescuda.cpp:(.text.startup+0x68b): undefined reference to > `boost::system::generic_category()' > > aescuda.cpp:(.text.startup+0x697): undefined reference to > `boost::system::generic_category()' > > aescuda.cpp:(.text.startup+0x6a3): undefined reference to > `boost::system::system_category()' > > collect2: ld returned 1 exit status > > make[1]: *** > [/home/mahmood/gpgpu-sim_distribution/ispass2009-benchmarks/bin//release/AES] > Error 1 > > make[1]: Leaving directory > `/home/mahmood/gpgpu-sim_distribution/ispass2009-benchmarks/AES' > > make: *** [default] Error 2 > > > > > > > > Any thought on that? > > > Regards, > Mahmood > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > https://lists.boost.org/mailman/listinfo.cgi/boost-users -- Daniel L'action accède à la perfection quand, bien que vivant, vous êtes déjà mort Bunan

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Many undefined references for libboost_filesystem
by Mahmood N 13 Oct '17

13 Oct '17

Hi, I am trying to build a suite as described at https://github.com/gpgpu-sim/ispass2009-benchmarks Some of the benchmarks use boost. For example, AES/Makefile has LINKFLAGS := -L$(BOOST_LIB) -lboost_filesystem Also, the Makefile.ispass-2009 in the root folder has the following settings SETENV=export BINDIR=$(BINDIR); \ export ROOTDIR=$(NVIDIA_COMPUTE_SDK_LOCATION)/C/src/; \ export BINSUBDIR=$(BINSUBDIR); \ export BOOST_LIB=/home/mahmood/boost_1_46_0/lib; \ export BOOST_ROOT=/home/mahmood/boost_1_46_0/include; \ export BOOST_VER=""; \ export OPENMPI_BINDIR=/usr/bin/; I manually built boost_1_46_0 with the steps described at http://www.boost.org/doc/libs/1_46_1/doc/html/bbv2/installation.html The installations was successful and I can see lib/ and include/ folders mahmood@vb:boost_1_46_0$ find lib -name libboost_system* lib/libboost_system.so.1.46.0 lib/libboost_system.so lib/libboost_system.a mahmood@vb:boost_1_46_0$ find lib -name libboost_filesystem* lib/libboost_filesystem.so lib/libboost_filesystem.a lib/libboost_filesystem.so.1.46.0 However, as I run “make -f Makefile.ispass-2009”, I get many undefined errors about libboost_filesystem. Please see below export BINDIR=/home/mahmood/gpgpu-sim_distribution/ispass2009-benchmarks/bin/; export ROOTDIR=/home/mahmood/NVIDIA_GPU_Computing_SDK/C/src/; export BINSUBDIR=release; export BOOST_LIB=/home/mahmood/boost_1_46_0/lib; export BOOST_ROOT=/home/mahmood/boost_1_46_0/include; export BOOST_VER=""; export OPENMPI_BINDIR=/usr/bin/; make noinline=0 -C AES make[1]: Entering directory `/home/mahmood/gpgpu-sim_distribution/ispass2009-benchmarks/AES' obj/x86_64/release/aesCudaUtils.cpp.o: In function `readFromFileForm(boost::filesystem3::path&, std::vector<unsigned int, std::allocator<unsigned int> >&)': aesCudaUtils.cpp:(.text+0x97d): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)' obj/x86_64/release/aesCudaUtils.cpp.o: In function `readFromFileNotForm(boost::filesystem3::path&, char*, unsigned int)': aesCudaUtils.cpp:(.text+0xe81): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)' obj/x86_64/release/aesCudaUtils.cpp.o: In function `getFileSize(boost::filesystem3::path&)': aesCudaUtils.cpp:(.text+0x1244): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)' aesCudaUtils.cpp:(.text+0x1257): undefined reference to `boost::filesystem3::detail::file_size(boost::filesystem3::path const&, boost::system::error_code*)' obj/x86_64/release/aesCudaUtils.cpp.o: In function `initAesCuda(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned char*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, char*, unsigned int)': aesCudaUtils.cpp:(.text+0x1c54): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()' aesCudaUtils.cpp:(.text+0x1cab): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()' aesCudaUtils.cpp:(.text+0x1ce5): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)' aesCudaUtils.cpp:(.text+0x1d02): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)' obj/x86_64/release/aesCudaUtils.cpp.o: In function `_GLOBAL__sub_I_aesCudaUtils.cpp': aesCudaUtils.cpp:(.text.startup+0x2b): undefined reference to `boost::system::generic_category()' aesCudaUtils.cpp:(.text.startup+0x37): undefined reference to `boost::system::generic_category()' aesCudaUtils.cpp:(.text.startup+0x43): undefined reference to `boost::system::system_category()' obj/x86_64/release/aescuda.cpp.o: In function `_GLOBAL__sub_I_aescuda.cpp': aescuda.cpp:(.text.startup+0x68b): undefined reference to `boost::system::generic_category()' aescuda.cpp:(.text.startup+0x697): undefined reference to `boost::system::generic_category()' aescuda.cpp:(.text.startup+0x6a3): undefined reference to `boost::system::system_category()' collect2: ld returned 1 exit status make[1]: *** [/home/mahmood/gpgpu-sim_distribution/ispass2009-benchmarks/bin//release/AES] Error 1 make[1]: Leaving directory `/home/mahmood/gpgpu-sim_distribution/ispass2009-benchmarks/AES' make: *** [default] Error 2 Any thought on that? Regards, Mahmood

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[coroutine] MinGW: terminate called after throwing an instance of 'boost::context::detail::forced_unwind'
by Jan Niklas Hasse 13 Oct '17

13 Oct '17

Hi :) I've tried to compile this simple Boost.Coroutine example: #include <iostream> #include <boost/coroutine2/all.hpp> void foo(boost::coroutines2::asymmetric_coroutine<void>::push_type& yield) { for (int i = 0; i < 10; ++i) { std::cout << i << std::endl; yield(); } } int main() { boost::coroutines2::asymmetric_coroutine<void>::pull_type coroutine(foo); for (int i = 0; i < 5; ++i) { coroutine(); } } On Linux this works as expected, just as on Windows with Visual Studio. But when I cross-compile on Linux using i686-w64-mingw32-g++ src/main.cpp -lboost_context-mt The resulting exe crashes with: 0 1 2 3 4 5 6 terminate called after throwing an instance of 'boost::context::detail::forced_unwind' abnormal program termination There's a similar problem on StackOverflow: https://stackoverflow.com/questions/45569418/how-to-use-boost-context-corre… But I'm having the crash only with the cross-compiled version, not MSVC. Am I doing something wrong? Or might this be a bug in Fedora's mingw32-boost package?

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1.65.1 as modular packages on Conan.io
by Rene Rivera 13 Oct '17

13 Oct '17

Following on with the announcement before CppCon of the 1.64.0 modular packages here we are with more. I'm pleased to announce that the 1.65.1 Boost C++ Libraries are now available individually using the Conan package manager. There's even some improvements for the 1.64.0 package also :-) Find out more from the Bincrafters post here <http://bit.ly/2g6VEpp>[1]. For help using the packages you can bug the Bincrafters team in the #Conan CppLan Slack channel <http://bit.ly/2ykeqC0>[2]. Conan is a C/C++ (and more) package manager that supports an open ended set of build system and tool integrations including: VisualStudio, Xcode, CLion, Ninja, QMake, Premake, and yes even CMake <http://bit.ly/2xzhpbg>[3]. [1] <https://bincrafters.github.io/2017/10/13/Conan-Packages-Boost-1-65-1/> [2] <https://cpplang.now.sh/> [3] <http://docs.conan.io/en/latest/integrations.html> -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net

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