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[test] tests in master failing
by Aparna Kumta 03 Nov '16

03 Nov '16

I'm seeing the following error in the master branch compiling with Oracle Developer Studio. # Running Boost.Build tests Traceback (most recent call last): File "run.py", line 71, in <module> runner(root) File "/export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_regression_src/regression.py", line 287, in __init__ self.main() File "/export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_regression_src/regression.py", line 624, in main getattr(self,action_m)() File "/export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_regression_src/regression.py", line 589, in command_regression self.command_test() File "/export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_regression_src/regression.py", line 368, in command_test self.command_test_boost_build() File "/export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_regression_src/regression.py", line 410, in command_test_boost_build "boost/bin.v2/libs/any/test/any_test.test")); OSError: [Errno 2] No such file or directory: '/export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/results/boost/bin.v2/libs/any/test/any_test.test' Looking at the bjam.log file I see: /export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_bb/src/kernel/modules.jam:107: in modules.call-in ERROR: rule "Jamfile</export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_root>.python-tag" unknown in module "Jamfile</export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_root>". /export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_bb/src/util/indirect.jam:98: in indirect.call /export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_bb/src/build/virtual-target.jam:455: in _adjust-name /export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_bb/src/build/virtual-target.jam:253: in abstract-file-target.__init__ /export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_bb/src/build/virtual-target.jam:561: in class(a)file-target.__init__ /export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_bb/src/kernel/class.jam:90: in class.new /export/home/sstrunk-tester/boost_regression/boost_regression_master/boost_intel-S2_cpp11/boost_bb/src/build/generators.jam:558: in generated-targets ... Has anyone else seen this? Thanks, Aparna

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[filesystem] Move constructor from string_type
by danny kabrane 03 Nov '16

03 Nov '16

Hi all, boost::filesystem::path has 2 constructors from a string_type, one with a const reference and another one without const (wich I find troubling), but there's no constructor from a rvalue string_type. Is there something planned to add a move constructor from a string_type ? Regards Danny

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[build] Annoying warnings from Asio, -isystem from bjam?
by Vinnie Falco 02 Nov '16

02 Nov '16

When I have "-Wunused-variable" I get these highly annoying warnings from boost/asio/error.hpp which I'm sure almost everyone has seen: boost_1_60_0/boost/asio/error.hpp:258:45: warning: ‘boost::asio::error::system_category’ defined but not used [-Wunused-variable] static const boost::system::error_category& system_category I don't want to disable the warning but I also don't want the false positives. Thankfully, clang and gcc have this wonderful option "-isystem" which lets you mark include paths as belonging to the system. This prevents warnings from being emitted that the programmer can do nothing about. How can I get Boost.Build to add the Boost library header search paths using "-isystem" so that gcc doesn't report warnings in Boost headers that I cannot do anything about? More detail here: http://stackoverflow.com/questions/1867065/how-to-suppress-gcc-warnings-fro… I've played around with <sysinclude> but can't seem to figure it out. Here's my Jamroot (my project builds on its own, without putting it in the Boost tree): https://github.com/vinniefalco/Beast/blob/master/Jamroot#L80 -- Follow me on Github: https://github.com/vinniefalco

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[algorithm]Interface for search algorithms
by Зайцев Александр 02 Nov '16

02 Nov '16

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[release] 1.63.0 closed for major changes
by Daniel James 02 Nov '16

02 Nov '16

Hi, The master branch is closed for major changes. In one week (9th Nov) it will be closing for the beta release. The full schedule is on the website: http://www.boost.org/development/ And if you haven't done so yet, please can you add your libraries' details to the release notes at: https://github.com/boostorg/website/blob/master/feed/history/boost_1_63_0.q… Or email them to me, if you don't like writing quickbook.

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Curiousity question
by Edward Diener 01 Nov '16

01 Nov '16

I would like to ask a design question for any Boost developers or anyone on this mailing list who might care to answer. You are designing or working on a library, perhaps for Boost, perhaps for fun, and part of the design of the library has some public functionality taking a shared pointer as input. You: 1) Use boost::shared_ptr 2) Use std::shared_ptr 3) Use both boost::shared_ptr and std::shared_ptr with the same functionality 4) Use neither, you roll your own shared pointer-like functionality 5) You don't lke shared pointers and use raw pointers instead I really am curious about this. I haven't put any limitation on your library or made any presumption on who your library is for, on purpose. Thanks for anyone answering !

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[process] Formal Review starts today, 27 October
by Remi Chateauneu 31 Oct '16

31 Oct '16

Hi All, "Whether you believe the library should be accepted into Boost" It could be, but as some very important features are missinge, the implementation should be prepared from now on. "Your knowledge of the problem domain" About 20 yrs C++ development Linux and Windows. This library has a strong focus on the streaming which is quite rare and interesting. However, other very important features of multi-processing are missing should be planned: At least to ensure that, in the future, they can be added without breaking existing code. Example of these desired fatures are (Taken from my own needs) * List of subprocesses of a given process. * Get its parent pid (Already discussed). * Get the entire process tree of a machine. * It is very useful to be notified when a given process dies (unotify on Linux). * On windows, we have the feature e.startup_info.dwFlags = STARTF_RUNFULLSCREEN, which gives some control on the console, which Is very good. Could we have more documentation about it, and plans to have the same feature on Linux ? Generally speaking have some control on the process terminal if there is one. * Have some knowledge about users and user groups, as strings and integer identifiers: the concept is similar on Windows and Unix. * Have some control on process priority( Unix's nice command ) Indeed, many of these features are not portable, but most of time, developers use only a common core of features, which is quite enough. Maybe take inspiration from portable libraries such as Python psutil, which exposes a common interface for all operating systems. Interoperability: * It might be worth checking portability with other operating systems. BSD ? VMS ??? * Must ensure that this lib is interoperable with boost::interprocess (Concept of permissions might be worth using ?) * Does it build on pre-C++11 compilers ? Many projects are not able to upgrade to C++11 immediately and have to stick to previous C++ standard. Some critics (Nothing is perfect): * The merit of the ">" operator for optional arguments is to be visually similar to an indirection, but in the context of C++ programming, although elegant, it is I think confusing and could be mismatched with <> templates or comparisons. Creating a process is a not-so-frequent operation and we should not be afraid to be verbose and very clear, I believe. * Syntax ‘(bp::std_out & bp::std_err) > "output.txt"’ . Can we explain the exact difference with the syntax: ‘bp::std_out > "output.txt", bp::std_err > "output.txt"’’ * More comments in the code and examples please. * Examples async_io.cpp or arg.cpp do not build with boost 1.62: include\boost\process\detail\windows\compare_handles.hpp(24): error C2039: 'BY_HANDLE_FILE_INFORMATION_': is not a member of 'boost::detail::winapi' * ‘typedef basic_environment<wchar_t> wenvironment;’ : Is It really useful ?? POSIX getenv() only uses char. * Why is the class basic_environment so big, as it is basically a simple std::map< std::string, std::string > ? (Naïve question). Anyway, many congratulations for this very interesting work, which is definitely on the right direction. Regards

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[gil] Some documentation links broken
by Edward Diener 31 Oct '16

31 Oct '16

In the documentation for Gil the links to the video tutorial, as well as the Information links on the left hand side of the initial page, are broken. Does anybody know if these links still exist anywhere ?

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libstdc++ debug mode
by Robert Ramey 31 Oct '16

31 Oct '16

Back on May 2 2016 I made what I thought was an innocuous change to the serialization library build. I then forgot about it. I ran my tests and normal on my OSX set up for the compilers that I use there - clang and g++ 5.1 in various modes 03, 11 etc. Things seemed fine. I uploaded the develop branch as normal. Sometime later I discovered that all the gcc tests on linux platforms were failing with a segfault. Unfortunately time had passed and I couldn't run the tests myself so I never could figure out what the breaking change was. Lately I separated time to get to the bottom of this and in installed via Parallels ubuntu v 14 on my Mac as a guest operating system. After the usual back and forth getting stuff to work I was able to reproduce the problem. Running gdb indicated that things crashed with a call to boost::io::state_saver which led me to investigate THAT library which as it turned out is also failing all it's tests on the plaform. So thought I - no problem - all I have to do is to complain to the author of that library. But this didnt' workout a) I posted message and no one responded. b) I checked trac items and there was what seemed a related item. But it seemed a little hard to understand/fix and in any case, no one addressing it. I looked into just fixing it myself, but it looked to entail delving into the bowels of libstd++. So this dissuaded me as I have my own bowels to delve into. c) So I commented out references to boost::io::state_saver an ran some tests - and damn still failed. d) So I rolled back my source to the master dated 24 April 2016 and incrementally updated and ran some tests until I found the culprit. Needless to say, this is quite a tedious procedure. The issue seems to be that I added the following to the jamfile: <toolset>gcc:<define>_STLP_DEBUG <toolset>gcc:<define>_GLIBCXX_DEBUG The second adds a lot of checking. commenting this permitted tests to pass. Lesson of all this is: a) I'm thinking we should run all tests on the deelop branch with _GLIBCXX_DEBUG defined. That is, our jam files should contain?: <toolset>gcc:<variant>debug><define>_GLIBCXX_DEBUG b) it looks like when an error in libstd++ is encounted - things just segfault. I couldn't find the corresponding source in libstd++. GDB just bailed when I made a call to state_saver. c) boost::io::state_saver should be maintained. d) It would be helpful to be able to roll back the test matrix to any previous git version. That is, the results would be put into a database or datacube and we could scroll back and forth to see track down problems in test results. Robert Ramey

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Review Manager needed for stacktrace library
by Antony Polukhin 27 Oct '16

27 Oct '16

Hello, Stacktrace is a C++98 library for storing and printing backtraces. Supports major platforms, does demangling, has API for accessing individual frames, supports hashing and comparison operators. Library: https://github.com/apolukhin/stacktrace Docs: http://apolukhin.github.io/stacktrace/index.html Anyone wishing to become the Review Manager for the library? -- Best regards, Antony Polukhin

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[preprocessor] PR decision for Intel C++ 17 on up on Windows
by Edward Diener 27 Oct '16

27 Oct '16

I need some guidance from Boost developers in general. A PR has been issued for Boost PP which only affects Intel C++ 17 on up in Windows. I can ascertain that only this compiler in Windows is affectd by the PR. Needless to say I do not test this personally because it costs a decent amount of money to buy a license. Intel does graciously offer free licenses for Intel C++ on Linux for Boost developers and I have used it to test the compiler under Linux. Also there are no regression tests for Intel C++ on Windows in the 'develop' or 'master' regression test matrices. While the person who issued the PR ascertains that it fixes problems for Boost libraries he uses with Intel C++ 17 on Windows the nature of the PR is drastic enough that it could easily break other libraries if the changes in the PR does not correspond to Intel C++ preprocessing in all cases. So my quandary is what to do about the PR. The PR is at https://github.com/boostorg/preprocessor/pull/9#issuecomment-256741882. It is another one of these cases, like clang targeting VC++, where a compiler implementation on Windows wants to emulate the non-standard VC++ preprocessor but can't quite get it right ( as if emulating a broken preprocessor should ever be right ). Thoughts ? Ideas ? Suggestions ?

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Boost odeint 1.62 link broken
by Daniel Duffy 27 Oct '16

27 Oct '16

________________________________________ From: Boost [boost-bounces(a)lists.boost.org] on behalf of Karsten Ahnert [karsten.ahnert(a)googlemail.com] Sent: 16 May 2016 15:08 To: boost(a)lists.boost.org Subject: Re: [boost] Boost 1.61.0 has been released > The Asio link http://www.boost.org/doc/libs/1_61_0/libs/asio/ is broken > (on http://www.boost.org/doc/libs/1_61_0/) I get ERR_TOO_MANY_REDIRECTS > with Chrome. The odeint link is also broken. I get "404 Not Found File "/home/www/live.boost.org/common/code/../../doc/archives/boost_1_61_0/libs/numeric/odeint/doc/html/index.html" not found. Unable to find file." Karsten _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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[boost.process] Review
by Klemens Morgenstern 27 Oct '16

27 Oct '16

Boost.Process 0.6, as can be found here (https://github.com/klemens-morgenstern/boost-process) will be in review from October 27 to November 5. The review manager will be Antony Polukhin. Doc (http://klemens-morgenstern.github.io/process/) I really hope this library gets through the review, since boost (or C++ for that matter) really needs a process library. I would be really happy, if some of you could take the time to look into it - if you find any major issues, they might be addressed, before the actualy review. That would then increase the probability of the library getting accepted.

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[release] 1.63.0 now closed for new libraries and breaking changes
by Daniel James 27 Oct '16

27 Oct '16

Hello all, The master branch is now closed for new libraries and breaking changes, and will be closing for major changes in a week (2nd Nov) and closed for the beta in two weeks (9th Nov). Also, if you're ready, you can also add your libraries' changes to the release notes at: https://github.com/boostorg/website/blob/master/feed/history/boost_1_63_0.q… thanks, Daniel

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[fixed_point] First presentation from GSoC 2015 and more
by Christopher Kormanyos 25 Oct '16

25 Oct '16

Hello Boost developers, A partial implementation of fixed-point in a Boost-like style based on proposal N3352 is now available.This work is the result of developments from 2013-2016, including efforts from GSoC 2015. The source code is available at: fixed_point-masterPreliminary docs are available at: fixed_point-docWe are potentially interested in submitting this work for inclusion in Boost. We are now requesting comments and suggestions for improvements, corrections and any further test results if these become available.Some key library features include:* proper C++ header-only implementation * full numeric_limits and <cmath> functions * flexible template choice of split between resolution and range * automatic selection of underlying integral representation * portability and high efficiency for bare metal microcontrollers * interoperation with Boost.Math * seamless extension to high-precision using Boost.Multiprecision * extensive test suite Thank you for your consideration. Best regards,Christopher Kormanyos

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[serialization] 2 blocking bugs
by alainm 25 Oct '16

25 Oct '16

Hi, My Boost.MPI builds are currently failing because of two blocking bugs in serialization (merge request 47 and 46). Could someone have a look please ? Thanks Alain

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boost @ Meeting C++ 2016
by Jens Weller 24 Oct '16

24 Oct '16

Hello boost community, a short and final reminder, that the Meeting C++ conference is just a few weeks away! A few tickets are still available, here is the schedule: https://meetingcpp.com/index.php/schedule16.html The schedule also has the link to the student program and diversity tickets! Also there is still a few places available in the boost workshop with Boris Schäling and Michael Caisse. I plan to have a meetup for boost users in one of the breaks in the upper lounge, so that the boost communtiy is able to actually meet at Meeting C++! thanks, Jens Weller

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Interest in chained relational operations
by Rahman Salim Zengin 24 Oct '16

24 Oct '16

Hi, The code in question is a simple chained comparison implementation. It works with any type If relational operators for that type is defined. https://github.com/rszengin/chain May some people find it useful?

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predef: BOOST_COMP_MSVC defined for Gcc/Linux?
by Oliver Kowalke 24 Oct '16

24 Oct '16

Hi, test '#if defined(BOOST_COMP_MSVC)' evaluates to true with GCC on Linux. what I'm missing? Oliver

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[interprocess] interprocess_condition blocks on notify_all if other process crashes
by Remi Chateauneu 22 Oct '16

22 Oct '16

When two processes share memory, and if one of them dies leaving a mutex in locked state, then the other process blocks on a notify using a interprocess_condition, stored in shared memory. This is described here: http://stackoverflow.com/questions/18240263/boost-interprocess-condition-bl… The reason is that this condition uses in general, a ipcdetail::spin_condition. Here is what it does in boost/interprocess/sync/interprocess_condition.hpp and boost/interprocess/sync/spin/condition.hpp : inline void spin_condition::notify(boost::uint32_t command) { //This mutex guarantees that no other thread can enter to the //do_timed_wait method logic, so that thread count will be //constant until the function writes a NOTIFY_ALL command. //It also guarantees that no other notification can be signaled //on this spin_condition before this one ends m_enter_mut.lock(); It locks an internal mutex, and if it is already locked and not unlocked by the crashed process, we are blocked. A fix is to replace lock() by: if( ! m_enter_mut.timed_lock(delay) ) throw an_exception(); A cleaner fix would be to derive a subclass from spin_condition to implement something like: bool derived_spin_condition::timed_notify(boost::uint32_t, ptime delay) What do you think ? Thanks.

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[config] Changes to reflect Visual C++ "15" preview 5
by Beman Dawes 21 Oct '16

21 Oct '16

Boost.Config is current reporting these macros for msvc 14.0 update 3 and later: BOOST_NO_COMPLETE_VALUE_INITIALIZATION Xiang Fan of the VC++ compiler team kindly tested "15" preview 5 against boost without this macro is still getting errors. So this one is still needed. BOOST_NO_CXX11_HDR_CODECVT That's wrong. <codecvt> has been supplied at least since msvc 10.0. I'll submit a P/R. BOOST_NO_CXX14_AGGREGATE_NSDMI Here is a test program, based on the config docs: #include <cassert> struct Foo { int x, y = 42; }; int main() { Foo foo = { 1234 }; assert(foo.y == 42); assert(foo.x == 1234); } That now passed on "15" preview 5, so I'll summit a P/R. BOOST_NO_CXX14_CONSTEXPR The "15" preview 5 release notes say "The most notable compiler changes include complete support for generalized constexpr" I know from conversations with msft folks that they put a lot of effort into constexpr fixes, and that they would like bug reports if anyone is finds constexpr bugs with "15" preview 5. I'll submit a P/R. BOOST_NO_TWO_PHASE_NAME_LOOKUP This one still applies. The backstory has changed a lot, however. Enough progress has been made on the new parser that two phase name lookup should ship next year, and maybe even early next year. But don't hold your breath quite yet. Thanks to Andrew Pardoe for fact checking a draft of this post. --Beman

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Review Manager needed for the C++14 Reflections Library that works Without Macro nor Markup (ex magic_get)
by Antony Polukhin 20 Oct '16

20 Oct '16

Hello, PFR is a C++14 library that represents POD structures as tuples and provides tuple-like methods for PODs. Library has a set of predefined operators for PODs and useful functions for everyday use. Works with user-defined types without any macro nor boilerplate code. Has additional (theoretical) features for C++17. Library: https://github.com/apolukhin/magic_get Docs: http://apolukhin.github.io/magic_get/ Boost Library Incubator: http://blincubator.com/bi_library/pfr-pod-flat-reflection/?gform_post_id=16… Anyone wishing to become the Review Manager for the library? -- Best regards, Antony Polukhin

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[spirit][qi] How to write a boost::spirit::qi parser to do what '?' does in regex?
by Han Wang 19 Oct '16

19 Oct '16

Let's say we have a regex "start:(?: ([0-9]{1,2}))? ([0-9].*)". It will match std::string string1 = "start: 01 0ab"; and std::string string2 = "start: 0ab"; We can also get the 2 matched string respectively. I try to use boost::spirit::qi parser to parse string2 but it couldn't match. qi::rule<std::string::const_iterator, std::string()> rule1 = qi::repeat(1,2)[qi::digit]; qi::rule<std::string::const_iterator, std::string()> rule2 = qi::digit >> *qi::char_; std::vector<std::string> attr; auto it_begin = string2.begin(); auto it_end = string2.end(); if (qi::parse( it_begin, it_end, qi::lit("start:") >> -(qi::lit(" ") >> rule1) >> qi::lit(" ") >> rule2 >> qi::eoi, attr)) std::cout<<"match"<<std::endl; else std::cout<<"not match"<<std::endl; We can of course use a look-ahead operator to check what's behind rule1, but is there a more generic approach to implement regex operator '?' ? Thanks!

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[container] small_flat_set and small_flat_map
by Sam Kellett 19 Oct '16

19 Oct '16

Given that Boost.Container has a small_vector now, would a piece of work that changed flat_set and flat_map to use small_vector<0> internally be feasible? I ask because I feel like if this was the case it would be almost trivial to expose flat_tree<N> through small_flat_set<N> and small_flat_map<N> types to provide the small size optimisation for these two containers.

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Error in Review Schedule
by Emil Dotchevski 19 Oct '16

19 Oct '16

It seems like the entry for the Callable Traits library in http://www.boost.org/community/review_schedule.html links the PODs Flat Reflection documentation. Emil

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