May 2017 - Boost-users - lists.boost.org

Test: Skip test from fixture
by Florian Lindner 15 May '17

15 May '17

Hello, given I have a test with a fixture. How can I skip that test from within the fixture? Thanks, Florian

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(no subject)
by Daniel Estermann 14 May '17

14 May '17

Hello everybody, I am trying to build HPX (https://github.com/STEllAR-GROUP/hpx) which uses Boost under Cygwin and I bumped into an incompatibility issue between the class boost::asio::detail::winsock_init_base and the WinSocket-API exposed by Cygwin. The error summary: the types of variable members in winsock_init_base::data are long (defined in boost/asio/detail/winsock_init.hpp). These variable are passed to functions _InterlockedIncrement, _InterlockedExchange etc (called from boost/asio/detail/impl/winsock_init.ipp). But there are no functions defined in Cygwin (in headers in /usr/include/w32api) expecting a long parameter. Here you can see the full gcc output: https://pastebin.com/raw/8MDa8QXJ I also produced the the preprocessor output which I zipped and uploaded to https://www.dropbox.com/s/anmjsjnvq7lnesr/hpx_init.cpp.i.zip?dl=0 Am I overlooking anything or is this really an incompatibility issue?

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Context and coroutine for ARM
by Daniel Estermann 14 May '17

14 May '17

I am trying to cross compile boost 1.63 for Raspberry Pi, i.e. for an ARM core. But the build fails for boost-coroutine and boost-context. Here is my build log http://sprunge.us/NVDd As far as I can see from development files in https://github.com/ boostorg/context/tree/develop/src/asm ARM is supported at least by boost-context. Is there anything I can do about or any progress for this issue? If not, is there an older version I should try? Regards

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Using the (new) C++ standard library in boost::dll
by Benjamin Buch 12 May '17

12 May '17

The boost::dll depends on 4 different boost-libraries which all have counterparts in the C++17 standard library. Worse, two of them (system & filesystem) are not header-only libraries, so you need to link against these libraries. Is it possible and planned to use the standard library counterparts as plug in replacement for these boost dependencies in a future release? In my opinion this would improve the usability massively, especially when you already use this counterparts in the rest of your program. Best regards, Benjamin

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boost::process::search_path() and compound cmd
by niXman 11 May '17

11 May '17

Hi, I need to execute the 'stdbuf -oL -eL python scrypt.py' cmd but if I write the: auto p = boost::process::search_path("stdbuf -oL -eL python2"); boost::process::child c(p, "script.py"); c.wait(); I get the exception with 'execve failed: Permission denied' message. My question is, what should I change in my example for executing the 'stdbuf -oL -eL python2 scrypt.py' cmd? Thanks. -- Regards, niXman ___________________________________________________ Dual-target(32 & 64-bit) MinGW-W64 compilers for 32 and 64-bit Windows: https://sf.net/p/mingw-w64/

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[Fiber] Can a fiber promise be set in a different OS thread on which has no fibers running
by lin li 11 May '17

11 May '17

I have tested the following example code with Boost 1.61. And it worked (ignore the potential race conditions when accessing the variable 'p'). But I am not sure the fiber promise can be used in this way or I am just being lucky. #include <cstdlib> #include "boost/fiber/fiber.hpp" #include "boost/fiber/future.hpp" #include "boost/thread.hpp" #include <set> #include <iostream> #include <boost/date_time/posix_time/posix_time_duration.hpp> #include <boost/thread/pthread/mutex.hpp> #include <boost/thread/lock_guard.hpp> #include "boost/thread/pthread/thread_data.hpp" #include "boost/chrono/duration.hpp" using namespace std; boost::fibers::promise<int>* p; void wait() { p = new boost::fibers::promise<int>; auto future = p->get_future(); auto status = future.wait(); std::cout << "Value: " << future.get() << std::endl; delete p; } void f() { boost::fibers::fiber fiberJob(&wait); fiberJob.join(); } void setf() { // Is it safe to do this? boost::this_thread::sleep(boost::posix_time::seconds(5)); p->set_value(20); } void f1() { boost::fibers::fiber fiberJob(&setf); fiberJob.join(); } int main(int argc, char** argv) { boost::thread t(&f); setf(); cout << "Here" << endl; t.join(); cout << "Here 2" << endl; return 0; }

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Cutting headers
by Igor Mironchik 10 May '17

10 May '17

Hello, How can I cut specific library from Boost, if, for example, I don't want to place all Boost but only one library from Boost? Is it possible? --- This email has been checked for viruses by AVG. http://www.avg.com

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boost::asio::deadline_timer cancel and expires_from_now
by jupiter 10 May '17

10 May '17

Hi, Is it necessary to call the timer.cancel() before timer.expires_from_now? I think it is not just unnecessary, it will be a bug to call the timer.cancel() before timer.expires_from_now, I think that will run the cancel if the previous timer is not expired, is it correct? Thank you

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database access library in boost?
by Paolo Bolzoni 09 May '17

09 May '17

Dear list, I was wondering, why there is no database access library in boost? (am I wrong?) It seems an imporant feature to not-have in a such library collection, so there must be a reason. Is there some "official" raccomandation? Soci, cppdb? Your faithfully, Paolo

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Fwd: configure Jamfile boost 1_63_0 tutorial to build from command line with bjam
by Giulio De Luca 09 May '17

09 May '17

I´m totally new to boost, I just downloaded boost_1_63_0 and I´m trying to build the tutorial example located in \boost_1_63_0\libs\python\example\tutorial by following the tutorial documentation <http://www.boost.org/doc/libs/1_62_0/libs/python/doc/html/tutorial/index.ht…> http://www.boost.org/doc/libs/1_62_0/libs/python/doc/html/tutorial/ index.html The example is quite simple: it only contains 4 files: 1. hello.cpp 2. hello.py 3. Jamfile 4. ../Jamroot For simplicity I´m pasting below the content of each file : // hello.cpp #include <boost/python/module.hpp> #include <boost/python/def.hpp> char const* greet() { return "hello, world"; } BOOST_PYTHON_MODULE(hello_ext) { using namespace boost::python; def("greet", greet); } // hello.py import hello_ext print(hello_ext.greet()) And finally the boost configuration file: // Jamfile import python ; project tutorial : requirements <location>. ; python-extension hello_ext : hello.cpp ; run-test hello : hello_ext hello.py ; alias test : hello ; explicit test ; // ../Jamroot import python ; if ! [ python.configured ]{ ECHO "warning: no Python configured in user-config.jam" ; ECHO "warning: will use default configuration" ; using python ;} # Adjust the following if Boost.Python isn't installed in a default location lib boost_python ; project : requirements# <include>/path/to/boost/python <library>boost_python; rule run-test ( test-name : sources + ){ import testing ; testing.make-test run-pyd : $(sources) : : $(test-name) ;} build-project quickstart ; build-project tutorial ;if [ python.numpy ]{ build-project numpy ;} When I execute bjam.exe from my cmd prompt (after properly adding in the environment variables the path where bjam.exe is located) I get the following errors: ...found 12 targets......updating 5 targets... compile-c-c++ hello.obj hello.cpp hello.cpp(7) : fatal error C1083: Cannot open include file: 'boost/python/module.hpp': No such file or directory call "C:\Users\...\AppData\Local\Temp\b2_msvc_11.0_vcvarsall_x86.cmd" >nul cl /Zm800 -nologo @"hello.obj.rsp" ...failed compile-c-c++ hello.obj......skipped <p.>hello_ext.pyd for lack of <p.>hello.obj......skipped <p.>hello_ext.pdb for lack of <p.>hello.obj......skipped <p.>hello for lack of <p.>hello_ext.pyd......failed updating 1 target......skipped 4 targets... When I try and build the project from VS2012 I can build it properly because i know hot to add additional include libraries to the project, but I cannot find the proper way to config the Jamfile to make it build from command line. I tried to config the Jamroot file by changing the path to the boost/python libraries local path but with no luck. I wonder where and how should I add the absoulute path of the boost/python libraries. Any help would be much appreciated Thanks in advance!

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