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Re: [boost] [Boost-users] Need help with errors while building boost for clang on android NDK
by Robert Dailey 04 Oct '16

04 Oct '16

On Wed, Sep 28, 2016 at 10:49 AM, Robert Dailey <rcdailey.lists(a)gmail.com> wrote: > On Mon, Sep 26, 2016 at 11:55 AM, Robert Dailey > <rcdailey.lists(a)gmail.com> wrote: >> On Mon, Sep 26, 2016 at 11:09 AM, Oliver Kowalke >> <oliver.kowalke(a)gmail.com> wrote: >>> 2016-09-26 17:57 GMT+02:00 Robert Dailey <rcdailey.lists(a)gmail.com>: >>>> >>>> >> > clang-linux.compile.asm >>>> >> > >>>> >> > >>>> >> > bin.v2\libs\context\build\clang-linux-android\release\link-static\runtime-link-static\target-os-linux\threading-multi\asm\make_i386_ms_pe_gas.o >>>> >> > libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:30:1: error: unknown >>>> >> > directive >>>> >> > .def _make_fcontext; .scl 2; .type 32; .endef >>>> > >>>> > >>>> > you try to build for i386 instead arm >>>> >>>> How can I make it use arm instead? >>> >>> >>> I assume you try to cross compile : >>> http://www.boost.org/doc/libs/1_61_0/libs/context/doc/html/context/architec… >> >> I am indeed trying to cross compile, however I am not familiar with b2 >> nor do I much care to learn it (since it's a means to an end for me to >> build boost). >> >> Can you provide an example of how I can specify the documented >> settings to b2 for my build? Do I provide the values to those in my >> project-config file? > > Would really love help with this guys. I literally can't find info on > this anywhere else. Surely someone has had success getting 1.61 > building with NDK + ARM + Clang. > > I made a best-guess using the context cross compiling settings linked > earlier. Does this seem correct? It doesn't build at the moment saying > it can't find locale-related symbols. That doesn't help me at all so I > guess I'm going to have to dig into the llvm STL code and find out > what preprocessor flags I'm missing (assuming it's that simple). Also > I still don't know how to specify 'ar' and 'ranlib' executables to > boost from NDK. > > > using clang : android : > $(androidNDKRoot)/toolchains/llvm/prebuilt/$(androidPlatform)/bin/clang++ : > <compileflags>--sysroot=$(androidNDKRoot)/platforms/android-15/arch-arm > <compileflags>-Os > <compileflags>-fno-strict-aliasing > <compileflags>-O2 > <compileflags>-DNDEBUG > <compileflags>-g > <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++abi/libcxxabi/include > <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++/libcxx/include > <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a > <compileflags>-I$(androidNDKRoot)/sources/android/support/include > <compileflags>-DANDROID > <compileflags>-D__ANDROID__ > <compileflags>-D__arm__ > <compileflags>-D_REENTRANT > <architecture>arm > <address-model>32 > <binary-format>pe > <abi>aapcs > ; FYI: I still haven't gotten this working. Sorry to keep bumping this thread but I have absolutely zero options yet. I need help from the boost developers at this point, I think.

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[concept_check] convert Concept to trait?
by Vinnie Falco 04 Oct '16

04 Oct '16

I don't see a place to open issues on https://github.com/boostorg/concept_check so I am posting this here. What I want to do is convert a concept into a trait. For example, given the ForwardIterator concept checking class, I would like to write: template<T> using is_ForwardIterator = std::integral_constant<bool, ...>; Which aliases to std::true_type if T meets the requirements of ForwardIterator and false otherwise. Or perhaps a general purpose alias: template<t> using is_concept<T, C> = std::integral_constant<bool, ...>;l Which aliases to std::true_type if T meets the requirements of concept C. Are such things possible, or perhaps already in the library? My preliminary analysis suggests the answers to these questions are no and no. Has this point been brought up elsewhere, and if so where could I find it? Regards

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preparation for Gsoc 2017
by Prashant Kumar 04 Oct '16

04 Oct '16

Hello Boost community, I need some help for preparing effectively for Gsoc 17 with Boost community. I have been through the boost gsoc webpage and for getting selected in Gsoc an aspirant need to provide competency Test. I want to know that apart from competency test what other projects would be helpful in making my proposal strong. Should I be writting more programs using boost library ? , should I be aware of all boost libraries ?. I want your suggestions as I'm very serious regarding the matter. thanks!! and sorry if the question is quite nooby.

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How to build Boost with VS15
by Olaf van der Spek 04 Oct '16

04 Oct '16

Hi, How does one build Boost (1.62) with VS15 (Preview 4)? I know it's not officially supported.. C:\VC\boost>bootstrap.bat Building Boost.Build engine 'cl' is not recognized as an internal or external command, operable program or batch file. Failed to build Boost.Build engine. Please consult bootstrap.log for further diagnostics. -- Olaf

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Review Request: Synapse
by Emil Dotchevski 03 Oct '16

03 Oct '16

I'm requesting a formal review for the Synapse library. Edward Diener has kindly offered to serve as the review manager for Synapse. Synapse is a signal programming library, similar to Boost Signals2 and the signals-slots system in Qt. The main difference is that Synapse is non-intrusive: the address of any object of any static type whatsoever can be passed to synapse::emit to emit a signal. This makes it possible to emit Synapse signals from objects of third-party types as well as system objects (e.g. standard FILE pointers, HWNDs, etc.) or any other object that can be converted to a pointer. The library has been formatted to fit the Boost directory and namespace structure. To get Synapse, clone https://github.com/zajo/boost-synapse.git into a directory called synapse under your boost/libs directory. See the tutorial at http://zajo.github.io/boost-synapse/Tutorial.html, or read full documentation at http://zajo.github.io/boost-synapse/index.html. Thanks, Emil

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CMake Modularization
by Philip Woods 03 Oct '16

03 Oct '16

CMake is a widely used build system and has become for many the de facto standard. Boost is a widely used collection of modules and has become for many part of the de facto standard. However, the two do not play very well together. I know there is another port of boost to CMake, but it has lain dormant for years and uses an old version of boost; plus I chose to take a different route. The old project attempted to completely replace Boost.Build with CMake. My example port simply allows people to more easily use boost modules in their projects. I created an example project https://github.com/Elzair/cmake-boost-filesystem-test to demonstrate my ideas. I added CMake build support to the minimum number of modules needed to support this demo: https://github.com/Elzair/assert https://github.com/Elzair/config https://github.com/Elzair/core https://github.com/Elzair/filesystem/tree/master and https://github.com/Elzair/system I even added CMake build support to the header only boost libraries. I did this for two reasons. First, I did not want users to have to fool with CMake's find_package(). Second, I wanted to add helpful error messages in case a user has not included all of a module's dependencies (or added them in the wrong order). Would the community be interested in modular CMake support for more modules? Any comments, questions, critiques or suggestions are welcome.

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Cannot open include file: 'pyconfig.h'
by Olaf van der Spek 30 Sep '16

30 Sep '16

Hi, Boost 1.62 @ VC15, no Python installed: call "C:\Users\W7\AppData\Local\Temp\b2_msvc_default_vcvarsall_x86.cmd" >nul cl /Zm800 -nologo @"bin.v2\libs\python\build\msvc\debug\link-static\threading-multi\import.obj.rsp" ...failed compile-c-c++ bin.v2\libs\python\build\msvc\debug\link-static\threading-multi\import.obj... compile-c-c++ bin.v2\libs\python\build\msvc\debug\link-static\threading-multi\exec.obj exec.cpp C:\VC\boost\boost/python/detail/wrap_python.hpp(50): fatal error C1083: Cannot open include file: 'pyconfig.h': No such file or directory Should it be trying to build Python stuff? -- Olaf

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[release] Boost 1.62.0 release available
by Rene Rivera 30 Sep '16

30 Sep '16

Release 1.62.0 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 and numerous enhancements and bug fixes for existing libraries. New Libraries * Fiber: Framework for userland-threads/fibers, from Oliver Kowalke. * QVM: Boost QVM is a generic library for working with quaternions, vectors and matrices of static size with the emphasis on 2, 3 and 4-dimensional operations needed in graphics, video games and simulation applications, from Emil Dotchevski. For details, including download links, see http://www.boost.org/users/ news/version_1.62.0 You can also download directly from SourceForge: http://sourceforge.net/ projects/boost/files/boost/1.62.0/ The SHA256 checksums are as follows: b91c2cda8bee73ea613130e19e72c9589e9ef0357c4c5cc5f7523de82cce11f7 boost_1_62_0.7z 36c96b0f6155c98404091d8ceb48319a28279ca0333fba1ad8611eb90afb2ca0 boost_1_62_0.tar.bz2 440a59f8bc4023dbe6285c9998b0f7fa288468b889746b1ef00e8b36c559dce1 boost_1_62_0.tar.gz 084b2e0638bbe0975a9e43e21bc9ceae33ef11377aecab3268a57cf41e405d4e boost_1_62_0.zip Tom Kent has made pre-built windows binaries, and they are available at: https://sourceforge.net/projects/boost/files/boost-binaries/1.62.0/ To install this release on your system, see http://www.boost.org/doc/libs/ release/more/getting_started/index.html Thanks, --The Boost release team

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[release] Master open for changes.
by Rene Rivera 30 Sep '16

30 Sep '16

FYI.. Master branches are now open for changes for the next release. Note that because of the late 1.62.0 release the window for the next release is shorter than usual. And there is now less than a month before master closes again for new libraries. Please consult the calendar for further dates. -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

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[asio] inefficiency in the polling
by Tatsuyuki Ishi 29 Sep '16

29 Sep '16

The current run/poll_one does polling regardless if there's task in the queue. If there's task in the queue, polling is just a waste of system call, since there's already a job to do. Also, my common use case is "wait and consume all work", which is not covered efficiently by current design. (run_one+poll takes two system calls) Side note: on Windows asio performs even worse, it only retrieve one event per syscall... Not sure if it's intended. Friendly note: please use "Reply to All" when replying to me.

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Population count procedure in dynamic_set
by Wojciech Muła 28 Sep '16

28 Sep '16

Hello! The library dynamic_bitset contains a slow population count procedure: https://github.com/boostorg/dynamic_bitset/blob/340822f979371973fe4a8436362… There are several better, faster and (more or less) portable algorithms. Daniel Lemire, Nathan Kurz and I work on a library which provides fastest possible implementations for CPU having AVX2 instruction set, you can check out its current state: https://github.com/CountOnes/hamming_weight. I also did an extensive comparison of different algorithms on different machines: https://github.com/WojciechMula/sse-popcount, one example https://github.com/WojciechMula/sse-popcount/blob/master/results/skylake/sk… As I mentioned these algorithms are different, the fastest use SIMD instructions, other depends on a CPU instruction. However, some approaches are portable, machine-independent, like this https://github.com/WojciechMula/sse-popcount/blob/master/popcnt-bit-paralle… It's possible to provide better solution at small cost, a lot of work has already been done. Would you be interested in including such boosted procedures as part of dynamic_bitset (or a new library)? Popcount itself is used in number of fields: I've found it in DNA matching (Jaccard index), computer vision, databases, and Daniel recently reported application in machine learning. best regards Wojciech

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[container] Trie data structure
by Зайцев Александр 28 Sep '16

28 Sep '16

Hi! My implementation of Aho-Corasick uses my own implementation of trie data structure. But i want something to use from Boost. Is there trie in Boost? If not, can I start work on trie for Boost? -- Best regards, Alexander Zaitsev

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Re: [boost] [Boost-users] [release] Boost 1.62.0 Release Candidate 1
by Marshall Clow 28 Sep '16

28 Sep '16

On Tue, Sep 27, 2016 at 7:14 PM, Edward Diener <eldiener(a)tropicsoft.com> wrote: > On 9/27/2016 9:24 PM, Marshall Clow wrote: > >> >> >> On Mon, Sep 26, 2016 at 5:52 PM, Marshall Clow <mclow.lists(a)gmail.com >> <mailto:mclow.lists@gmail.com>> wrote: >> >> On Mon, Sep 26, 2016 at 7:36 AM, Rene Rivera <grafikrobot(a)gmail.com >> <mailto:grafikrobot@gmail.com>> wrote: >> >> The release candidates for the 1.62.0 release are now available >> at: >> >> >> [snip] >> >> >> >> Now to run some tests.... >> >> -- Marshall >> >> >> The test "vmd/test/test_doc_modifiers_return_type.cpp" hangs clang. >> Reported as https://llvm.org/bugs/show_bug.cgi?id=30546 >> > > Evidently clang runs out of memory. Note that with VC++ and gcc the test > passes. > > I don't know why clang would run out ot memory while VC++ and gcc do not > but I have not queried the clang mailing list further about it. An educated > guess is that clang calculates some fixed size for the preprocessor and > when macro expansions cause that fixed size to overrun you get an out of > memory condition. I can hardly believe that the preprocessor is really > running out of virtual memory, no matter how complicated the preprocessor > code gets in VMD. > > When I was discussing the problem with Richard, he opined that that might be a problem, if the preprocessed source exceeded 1 GB in size - which it doesn't. (GCC expands this test to about 700K) So I suspect it is "just a bug" -- Marshall

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[release] Boost 1.62.0 Release Candidate 1
by Rene Rivera 28 Sep '16

28 Sep '16

The release candidates for the 1.62.0 release are now available at: https://sourceforge.net/projects/boost/files/boost/1.62.0.rc.1/boost_1_62_0… https://sourceforge.net/projects/boost/files/boost/1.62.0.rc.1/boost_1_62_0… https://sourceforge.net/projects/boost/files/boost/1.62.0.rc.1/boost_1_62_0… https://sourceforge.net/projects/boost/files/boost/1.62.0.rc.1/boost_1_62_0… The SHA256 checksums are as follows: b91c2cda8bee73ea613130e19e72c9589e9ef0357c4c5cc5f7523de82cce11f7 boost_1_62_0_rc1.7z 36c96b0f6155c98404091d8ceb48319a28279ca0333fba1ad8611eb90afb2ca0 boost_1_62_0_rc1.tar.bz2 440a59f8bc4023dbe6285c9998b0f7fa288468b889746b1ef00e8b36c559dce1 boost_1_62_0_rc1.tar.gz 084b2e0638bbe0975a9e43e21bc9ceae33ef11377aecab3268a57cf41e405d4e boost_1_62_0_rc1.zip As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. Thanks, the release managers. -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

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[dll] Problem building documentation on Windows
by Vinnie Falco 27 Sep '16

27 Sep '16

I am trying to build the Boost documentation on Windows and I am encountering this error bash-4.3$ pwd /d/lib/boost_1_62_0/libs/dll/doc bash-4.3$ bjam Jamfile.v2:66: in modules.load *** argument error * rule doxygen ( target : sources + : requirements * : default-build * : usage-requirements * ) * called with: ( autodoc_shared_library_core : : <doxygen:param>HIDE_UNDOC_MEMBERS=YES <doxygen:param>HIDE_UNDOC_CLASSES=YES <doxygen:param>HIDE_SCOPE_NAMES=YES <doxygen:param>EXTRACT_ALL=NO <doxygen:param>EXTRACT_PRIVATE=NO <doxygen:param>BUILTIN_STL_SUPPORT=YES <doxygen:param>ENABLE_PREPROCESSING=YES <doxygen:param>MACRO_EXPANSION=YES <doxygen:param>ALIASES= \ "forcedlink{1}=\xmlonly<link linkend='boost.dll.\1'>boost::dll::\1</link>\endxmlonly" \ "forcedmacrolink{1}=\xmlonly<link linkend='\1'>\1</link>\endxmlonly" <doxygen:param>PREDEFINED= \ "BOOST_RV_REF(T)=T&&" \ "BOOST_RV_REF(shared_library)=shared_library&&" \ "BOOST_COPY_ASSIGN_REF(shared_library)=const shared_library&" \ "BOOST_MOVABLE_BUT_NOT_COPYABLE(shared_library)= \ shared_library(const shared_library&) = delete; \ shared_library& operator=(const shared_library&) = delete; " \ "BOOST_DLL_IMPORT_RESULT_TYPE=result_type" \ "BOOST_DLL_MANGLED_IMPORT_RESULT_TYPE=result_type" \ "BOOST_EXPLICIT_OPERATOR_BOOL()=explicit operator bool() const noexcept;" \ "BOOST_DLL_DOXYGEN" <xsl:param>boost.doxygen.reftitle=Shared Library Reference ) * missing argument sources D:/lib/boost_1_62_0/tools/build/src/tools\doxygen.jam:622:see definition of rule 'doxygen' being called D:/lib/boost_1_62_0/tools/build/src/build\project.jam:325: in load-jamfile D:/lib/boost_1_62_0/tools/build/src/build\project.jam:64: in load D:/lib/boost_1_62_0/tools/build/src/build\project.jam:145: in project.find D:/lib/boost_1_62_0/tools/build/src\build-system.jam:535: in load D:\lib\boost_1_62_0\tools\build\src/kernel\modules.jam:295: in import D:\lib\boost_1_62_0\tools\build\src/kernel/bootstrap.jam:139: in boost-build D:\lib\boost_1_62_0\boost-build.jam:17: in module scope I get the same error when I try to build the full documentation from boost_1_62_0/doc/ My doxygen is at version 1.8.12 -- Follow me on Github: https://github.com/vinniefalco

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[fiber] design fault with multithreading
by Tatsuyuki Ishi 27 Sep '16

27 Sep '16

The current design doesn't allow a work-stealing algorithm to distribute work perfectly. Unfortunately, the use of sleep queue and remote ready queue made it insufficient for schedulers like shared_work. Instead here, I'd like to propose it as non-pure virtual function in the algorithm class. This allows schedulers to override the queues, and enables the use of underlying implementation's timer manager, which is included in Asio. Friendly notice: please use "Reply All" when replying to me.

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Boost should not be saying "_FPOSOFF"
by Billy O'Neal (VC LIBS) 27 Sep '16

27 Sep '16

Hello, Boost folks. :) I tried to remove this undocumented internal macro from our STL because we used it in only one place, but this broke Boost: #define _FPOSOFF(fp) ((long long)(fp)) ...patience... ...found 722 targets... ...updating 18 targets... common.mkdir build\boost\bin.v2\libs common.mkdir build\boost\bin.v2\libs\iostreams common.mkdir build\boost\bin.v2\libs\iostreams\build common.mkdir build\boost\bin.v2\libs\iostreams\build\msvc-99 common.mkdir build\boost\bin.v2\libs\iostreams\build\msvc-99\debug common.mkdir build\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static common.mkdir build\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi compile-c-c++ build\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi\file_descriptor.obj file_descriptor.cpp d:\src\vc\wcfb01\qa\vc\FE\3rdpartycomp\boost_1_60_0\boost/iostreams/positioning.hpp(107): error C3861: '_FPOSOFF': identifier not found libs\iostreams\src\file_descriptor.cpp(265): warning C4244: 'argument': conversion from 'std::streamsize' to 'DWORD', possible loss of data libs\iostreams\src\file_descriptor.cpp(289): warning C4244: 'argument': conversion from 'std::streamsize' to 'DWORD', possible loss of data cl /Zm800 -nologo @"build\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi\file_descriptor.obj.rsp" ...failed compile-c-c++ build\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi\file_descriptor.obj... compile-c-c++ build\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi\mapped_file.obj mapped_file.cpp d:\src\vc\wcfb01\qa\vc\FE\3rdpartycomp\boost_1_60_0\boost/iostreams/positioning.hpp(107): error C3861: '_FPOSOFF': identifier not found libs\iostreams\src\mapped_file.cpp(59): warning C4244: 'return': conversion from 'const boost::iostreams::stream_offset' to '::size_t', possible loss of data libs\iostreams\src\mapped_file.cpp(325): warning C4244: 'argument': conversion from 'boost::iostreams::stream_offset' to 'SIZE_T', possible loss of data cl /Zm800 -nologo @"build\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi\mapped_file.obj.rsp" ...failed compile-c-c++ build\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi\mapped_file.obj... ...skipped <pbuild\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi>libboost_iostreams-vc-mt-gd-1_60.lib for lack of <pbuild\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi>file_descriptor.obj... ...skipped <pstage\lib>libboost_iostreams-vc-mt-gd-1_60.lib for lack of <pbuild\boost\bin.v2\libs\iostreams\build\msvc-99\debug\link-static\threading-multi>libboost_iostreams-vc-mt-gd-1_60.lib... common.mkdir build\boost\bin.v2\libs\iostreams\build\msvc-99\release common.mkdir build\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static common.mkdir build\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi compile-c-c++ build\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi\file_descriptor.obj file_descriptor.cpp .\boost/iostreams/positioning.hpp(107): error C3861: '_FPOSOFF': identifier not found libs\iostreams\src\file_descriptor.cpp(265): warning C4244: 'argument': conversion from 'std::streamsize' to 'DWORD', possible loss of data libs\iostreams\src\file_descriptor.cpp(289): warning C4244: 'argument': conversion from 'std::streamsize' to 'DWORD', possible loss of data cl /Zm800 -nologo @"build\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi\file_descriptor.obj.rsp" ...failed compile-c-c++ build\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi\file_descriptor.obj... compile-c-c++ build\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi\mapped_file.obj mapped_file.cpp .\boost/iostreams/positioning.hpp(107): error C3861: '_FPOSOFF': identifier not found libs\iostreams\src\mapped_file.cpp(59): warning C4244: 'return': conversion from 'const boost::iostreams::stream_offset' to '::size_t', possible loss of data libs\iostreams\src\mapped_file.cpp(325): warning C4244: 'argument': conversion from 'boost::iostreams::stream_offset' to 'SIZE_T', possible loss of data cl /Zm800 -nologo @"build\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi\mapped_file.obj.rsp" ...failed compile-c-c++ build\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi\mapped_file.obj... ...skipped <pbuild\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi>libboost_iostreams-vc-mt-1_60.lib for lack of <pbuild\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi>file_descriptor.obj... ...skipped <pstage\lib>libboost_iostreams-vc-mt-1_60.lib for lack of <pbuild\boost\bin.v2\libs\iostreams\build\msvc-99\release\link-static\threading-multi>libboost_iostreams-vc-mt-1_60.lib... ...failed updating 4 targets... ...skipped 4 targets... ...updated 10 targets... failed Billy3

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[iterator] Is there any interest in Null Iterator Adaptor ?
by Rahman Salim Zengin 27 Sep '16

27 Sep '16

Hi! It would be pleasure for me to hear about your precious thoughts. https://github.com/rszengin/null_iterator Best regards.

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Re: [boost] [fiber] Suggestions regarding asio
by Tatsuyuki Ishi 27 Sep '16

27 Sep '16

It would be better if you used "Reply to All", since I disabled the delivery from the list. > When considering using multiple threads with an io_service passed to a custom Boost.Fiber scheduler, I keep bumping into the problem that a given fiber scheduler instance must always run on its original thread -- but I know of no way to give an Asio handler "thread affinity." How do we get processor cycles to the scheduler on the thread whose fibers it is managing? Since we only poll on one master thread, we can easily get affinity. Maybe pseudocode is easier: * We have two class, one for main polling, others waiting for job. * The first one, polls from asio using the same way as the example (poll, or run_one). while(true) { if(!run_one()) stop_other_threads(); // No more work in asio, give up waiting poll(); // flush the queue // Now we should have some fibers in the queue. yield(); // continue execution } * Other threads, uses condvar to wait on the ready queue. awakened(){queue.push_back(f); cv.notify_[one,all](); iosvc.post([]{});} pick_next(){while(!jobs_available){cv.wait();} return job;}

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Code complexity
by Vard Antinyan 27 Sep '16

27 Sep '16

Dear Boost developers, We have undertaken a task to assess code complexity triggers and generate recommendations for developing simple and understandable code. Our intension is to share the results with you, developers, so everyone can learn the triggers behind complex software. We need your help for rigorous results. My request to you is - if you get 5-10 min. time, would you please consider to answer the questions of this survey on code complexity? https://goo.gl/forms/h9WXZ8VSEw7BUyHg1 You are welcome to learn preliminary results through this link: https://www.facebook.com/SoftwareCodeQuality/photos/?tab=album&album_id=163… The results will be shared in a public webpage and everyone possible will be invited to learn and discuss them. Your knowledge and experience is vital for achieving substantial and generalizable results, and your effort is much appreciated! Sincerely Vard Antinyan PhD candidate in University of Gothenburg, Sweden Tel: 0046317725707

2 1

(Boost) Synapse update
by Emil Dotchevski 27 Sep '16

27 Sep '16

(Synapse is not part of Boost. I appreciate feedback as well as looking for someone willing to volunteer as review manager when Synapse is submitted for formal review.) Synapse is a signal-programming library similar to the Qt signal/slot system and Boost Signals 2. The difference is that Synapse is non-intrusive: any object of any static type whatsoever can serve as an emitter. I've just updated Synapse with support for interthread communication. It is available on github: http://zajo.github.io/boost-synapse/index.html. Thanks, Emil

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Need help with errors while building boost for clang on android NDK
by Robert Dailey 26 Sep '16

26 Sep '16

I'm using NDK r11 and I'm setting up project-config.jam to build boost using clang + llvm STL. I'm running into a few errors that I do not know how to solve. I will post my config file at the bottom. First problem is that boost does not know where to find tools 'ar' and 'ranlib': clang-linux.archive bin.v2\libs\container\build\clang-linux-android\release\link-static\runtime-link-static\target-os-linux\threading-multi\libboost_container-clang-mt-s-1_61.a '"ar"' is not recognized as an internal or external command, operable program or batch file. '"ranlib"' is not recognized as an internal or external command, operable program or batch file. How can I explicitly specify the NDK path to these executables? Second problem is related to some assembler stuff, I think. I get these errors while compiling boost thread: clang-linux.compile.asm bin.v2\libs\context\build\clang-linux-android\release\link-static\runtime-link-static\target-os-linux\threading-multi\asm\make_i386_ms_pe_gas.o libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:30:1: error: unknown directive .def _make_fcontext; .scl 2; .type 32; .endef ^ libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:30:22: error: unknown directive .def _make_fcontext; .scl 2; .type 32; .endef ^ libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:30:36: error: expected identifier in directive .def _make_fcontext; .scl 2; .type 32; .endef ^ libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:30:40: error: unknown directive .def _make_fcontext; .scl 2; .type 32; .endef ^ libs\\context\\src\\asm\\make_i386_ms_pe_gas.asm:136:1: error: unknown directive .def __exit; .scl 2; .type 32; .endef ^ How can I solve this? I have no idea at this point. I'm invoking the build using: b2 --without-python threading=multi link=static runtime-link=static toolset=gcc-android target-os=linux threadapi=pthread --stagedir=android stage And my project-config.jam looks like: import option ; option.set keep-going : false ; androidNDKRoot = E:/android/ndk ; androidAbiVer = 4.9 ; androidPlatform = windows-x86_64 ; using clang : android : $(androidNDKRoot)/toolchains/llvm/prebuilt/$(androidPlatform)/bin/clang++ : <compileflags>--sysroot=$(androidNDKRoot)/platforms/android-15/arch-arm <compileflags>-Os <compileflags>-fno-strict-aliasing <compileflags>-O2 <compileflags>-DNDEBUG <compileflags>-g <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++abi/libcxxabi/include <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++/libcxx/include <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a <compileflags>-I$(androidNDKRoot)/sources/android/support/include <compileflags>-DANDROID <compileflags>-D__ANDROID__ <compileflags>-D__arm__ <compileflags>-D_REENTRANT ;

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[Math/Special Functions] Is there any interest in the Lambert W function?
by Balázs Cziráki 26 Sep '16

26 Sep '16

Greetings! I'm working on a C++ implementation of the Lambert W (a.k.a. product logarithm or Omega function) and I wanted to ask the Boost developer community if there is interest in adding it to the library. The current version can be found on GitHub: https://github.com/CzB404/lambert_w/ I've successfully tested it with Cygwin GCC v5.4, v6.2 and with MinGW GCC that is supplied with Code::Blocks, and also on Visual Studio 2015. A test on a Linux based OS (probably Ubuntu) is also going to happen. Any suggestions or constructive criticism is welcome. Best regards, Balázs Cziráki

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[range] sub_range of istream_range
by Andrew Hundt 26 Sep '16

26 Sep '16

I’m trying to iterate through a file using sub_ranges of an istream_range of an ifstream. However, it seems if I construct sub ranges of various subsets of the full istream_range, try to adjust the limits with advance_begin and advance_end, and then access them I get null dereferences. Any thoughts? I can produce an example if needed. Cheers! Andrew Hundt

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markable -- informal review request
by Andrzej Krzemienski 24 Sep '16

24 Sep '16

Hi Everyone, I would like to ask your opinion, suggestions, and perhaps an informal review of the 'markable' library. An alternative to boost::optional when performance really matters. It is the second incarnation of the 'compact_optional' library that I have presented last year. The main differences from the previous version: * name change: it is called 'markable' so that it is not confused with 'optional'. It uses "mark values" and mark policies" * it has the ability to mark an empty state even for the types with strong invariants, by marking a bit pattern rather than any proper value of T (an idea by Matt Calabrese) An example use case: typedef markable<mark_int<int, -1>> opt_int; opt_int oi; opt_int o2 (2); assert (!oi.has_value());assert (o2.has_value());assert (o2.value() == 2); static_assert (sizeof(opt_int) == sizeof(int), ""); The github repository: https://github.com/akrzemi1/markable And documentation therein: https://github.com/akrzemi1/markable/tree/master/documentation Any comments, suggestions or critique are most welcome. Regards, &rzej;

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