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[release] 1.68.0 closing for major changes next week
by Marshall Clow 21 Jun '18

21 Jun '18

One week from tomorrow master will closed for major changes. Upcoming dates: * 27-Jun: Boost 1.68.0 closed for major code changes * 4-Jul: Boost 1.68.0 closed for beta * 11-Jul: Boost 1.68.0 beta 1 * 1-Aug: Boost 1.68.0 closed for release * 4-Aug: Boost 1.68.0 release -- The Boost Release Team

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[Build] Create test with shared library linked against current Boost link-variant
by Alexander Grund 18 Jun '18

18 Jun '18

Hi, I discovered a severe bug in Boost.Serialization and am trying to contribute a test to the test suite to reproduce that behavior. I have a minimum example which runs into this (see also https://stackoverflow.com/questions/50064617/order-of-destruction-for-stati…) but I'm having trouble getting that into the Jamfile. What I need: 2 shared libraries linked against the currently tested Boost link-variant and link those into an executable not linked against Boost. So testcase a) would be against Boost-Shared and b) against Boost-Static. But in all cases the libraries itself must be shared. What I have: lib multi_shared_1 : multi_shared1.cpp ../build//boost_serialization : <link>shared ; lib multi_shared_2 : multi_shared2.cpp ../build//boost_serialization : <link>shared ; ... [ test-bsl-run test_multi_shared_lib : : multi_shared_1 multi_shared_2 ] Problem: This links against Boost-Shared even with "./b2 link=static" My best approach so far is to change "../build//boost_serialization" to "../build//boost_serialization/<link>static" but then I cannot test testcase a) (Boost-Shared) anymore. Also it does link other Boost-Libraries (filesystem, system) shared, not static. Furthermore I'd need to add `-fPIC` to the cxxflags of the boost libraries. This is minor as it can be done in the `.travis` file but I'd rather have it in the Jamfile so it is not missed in other test-environments. How can I achieve this? I'm not to familiar with the Jamfiles so this is basically all I could find so far. Thanks, Alexander Grund

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[container] [flat_map] Sub-optimal behavior when utilized with std::less<>
by Viktor Sehr 16 Jun '18

16 Jun '18

It seems to me that neither boost::flat_map nor boost:flat_set with a custom comparator such as std::less<> behaves like std::set/std::map. This results in unnecessary allocation, in difference from std::map/set when used with a std::string as key for example Example: // Please note that I pretend that "dummy" is large enough to make the std::string utilize the heap. auto set = std::set<std::string, std::less<> >{}; auto n = set.count("dummy"); // No conversion from const char* to std::string auto flatset = boost::container::flat_set<std::string, std::less<> >{}; auto n = flatset.count("dummy"); // const char* is converted to a std::string before comparison, thus resulting in an unnecessary allocation. Is this a known issue intended to be resolved? Looking at the code of STL (which ever version ships with Visual Studio), find, count etc has been extended with template key types in addition to the regular key_type using an "is_transparent" trait: template<class _Other, class _Mycomp = key_compare, class = typename _Mycomp::is_transparent> size_type count(const _Other& _Keyval) const { _Keyval _Paircc _Ans = equal_range(_Keyval); return (_STD distance(_Ans.first, _Ans.second)); } Best regards /Viktor Sehr

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Interest in (parts of) type_safe, e.g. Boost.StrongTypedef?
by Jonathan Müller 15 Jun '18

15 Jun '18

I've been working on https://github.com/foonathan/type_safe for the past 20 months or so. What started as an experimenting ground for type safe programming facilities quickly turned into a general mix bag of utilities. However, it became my most popular project, so there is something in there people find really useful. And with that multiple approached me wanting to have it added to Boost, so here I am. I do realize that not all of it is suited for Boost: some of it has overlap with existing libraries (e.g. optional/variant), some of it has better implementations elsewhere (e.g. improved integer types) and some of it is to novel/experimental (e.g. stuff like constrained_type). But there are some things that could be useful for Boost. I'm mainly thinking of the strong typedef facility. I plan on splitting the library up into multiple parts anyway (see also https://github.com/foonathan/type_safe/issues/82) so please let me know whether there is anything you'd like to see being prepared for Boost. Thanks, Jonathan

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[rational] release (optimized) builds are failing unit tests
by James E. King, III 12 Jun '18

12 Jun '18

I am adding CI to Boost.Rational and the unit tests are failing for different levels of optimization on different compilers. Before I dig into it further, does anybody have any idea what this might be? https://github.com/boostorg/rational/issues/18 See issue for error output. Ubuntu Bionic gcc unit test succeeds: -O0, -O1 unit test fails: -O2, -O3 boost@17b66a9efac4:/boost/libs/rational/test$ g++ --version g++ (Ubuntu 7.3.0-16ubuntu3) 7.3.0clang unit test succeeds: -O0 unit test fails: -O1, -O2, -O3 boost@17b66a9efac4:/boost/libs/rational/test$ clang++-6.0 --version clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final) Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin To reproduce, try: boost@17b66a9efac4:/boost/libs/rational/test$ ../../../b2 toolset=clang variant=release rational_test I am using the ubuntu bionic docker container to do the build in. See boostorg/boost#184 <https://github.com/boostorg/boost/pull/184>

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[release] 1.68.0 deadline for new libraries approaching
by Marshall Clow 12 Jun '18

12 Jun '18

One week from tomorrow master will closed for new libraries. Upcoming dates: * 20-Jun: Boost 1.68.0 closed for new libraries and breaking changes * 27-Jun: Boost 1.68.0 closed for major code changes * 4-Jul: Boost 1.68.0 closed for beta * 11-Jul: Boost 1.68.0 beta 1 * 1-Aug: Boost 1.68.0 closed for release * 4-Aug: Boost 1.68.0 release -- The Boost Release Team

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meta/libraries.json question
by Antony Polukhin 11 Jun '18

11 Jun '18

Hello, I see that I can specify "std": [ "proposal" ], in meta/libraries.json. What are the other options? Can I write "с++17" instead of "proposal" (for Any and Variant)? -- Best regards, Antony Polukhin

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boost::winapi and Windows CE 7 and Windows Mobile 6
by Vyacheslav Lanovets 07 Jun '18

07 Jun '18

Hello, I am having big trouble migrating from 1.65.1 to 1.67 in VS2008 for CE platform. We already have quite a few patches for boost we reapply on every update. Boost 1.67 added more issues here and there, and among them the winapi library. On our old CE 7.00 I have winnt.h file where the second branch get selected. #if (defined(_M_MRX000) || defined(_M_IX86) || defined(_M_ALPHA) || defined(_M_PPC) || defined(_M_IA64)) && !defined(MIDL_PASS) #define DECLSPEC_IMPORT __declspec(dllimport) #else #define DECLSPEC_IMPORT #endif Therefore, WINAPI functions are not imported but is linked via corelib.lib library. So when I compile my code I see 3>D:\Dev\boost167\boost/winapi/semaphore.hpp(48) : error C2375: 'CreateSemaphoreW' : redefinition; different linkage 3> C:\Program Files (x86)\Windows CE Tools\SDKs\DS-200i\include\ARMv4I\winbase.h(3189) : see declaration of 'CreateSemaphoreW' To make things worse in Windows Mobile 6 SDK half of API is imported and half is not (goes through corelib.lib). Visual Studio 2008 installer includes WM6 SDK. And in the file C:\Program Files (x86)\Windows Mobile 6 SDK\PocketPC\include\ARMV4I\winbase.h there are functions not prefixed with WINBASEAPI. The solution would be to have 2 new defines instead of BOOST_SYMBOL_IMPORT in boost::winapi. On CE 7 both would be empty, on WM 6 one would be __declspec(dllimport) Regards, Vyacheslav

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Yap formally accepted into Boost
by Louis Dionne 04 Jun '18

04 Jun '18

Dear Boost, This message is to announce that Yap (which had been conditionally accepted [1]) is now accepted into Boost, since the conditions for acceptance have been met. The conditions for acceptance were: - Improve the documentation to satisfy Brook Milligan and myself (done) - A single macro for symmetric binary operators (done in https://github.com/tzlaine/yap/issues/22) - Get rid of external dependencies checked into repository (done) - Boost.Build (done in https://github.com/tzlaine/yap/issues/52) Congratulations Zach! Louis Dionne Review manager for Boost.Yap [1]: https://lists.boost.org/boost-announce/2018/03/0540.php

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Re: [boost] [Algorithm] contains(v, 1)
by Jean-Philippe DUFRAIGNE 04 Jun '18

04 Jun '18

On 5/31/18 3:14 AM, Olaf van der Spek via Boost wrote: > Hi, > > vector<int> v; > contains(v, 1); > > This doesn't work as contains expects two ranges (AFAIK). > Is there some other function that's usable for this purpose? > Should contains support a value for argument 2? > > Gr, > Hi, This algorithm exists: boost::any_of_equal https://www.boost.org/doc/libs/1_67_0/libs/algorithm/doc/html/the_boost_alg… Thanks; Jean-Philippe

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