May 2013 - Boost - lists.preview.boost.org

atomic lockpool and alignment
by Jesper Storm Bache 20 May '13

20 May '13

I am new to this list, so I apologize if this has already been discussed. boost_1_53_0/libs/atomic/src/lockpool.cpp contains: static lockpool::lock_type lock_pool_[41]; On most systems, I would expect that lock_type becomes atomic<bool> v_; I therefore seems to me that we are packing a large number of commonly used locks into sequential memory and therefore increasing the risk of false sharing due to cache line sharing. At the same time, I expect that the 41 lock instances will be used frequently and as such it seems to make sense to align the array to a VM page boundary (to get only a single hot VM page). Has alignment/padding been considered for the lock_pool implementation? If so what are the reasons for its dismissal? Thanks, Jesper Storm Bache

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Can't find documentation for contributing to Boost.
by Jeffrey Yasskin 20 May '13

20 May '13

I'm thinking of sending in a fix for https://svn.boost.org/trac/boost/ticket/7630, and to do that I need to check out Boost at head and run the tests for the Range project. So I went to http://www.boost.org/development/index.html hoping to find instructions. That page has some useless graphs and a calendar, but no mention of source control or command lines. I don't want to contribute testing resources, so I look on the right side for something that looks useful. "Submissions" leads to http://www.boost.org/development/submissions.html, which talks about contributing a whole new library rather than fixing bugs in an existing one. Nothing else in the right-side navigation box looks like it's going to help. A couple times in the past, I've just given up at this point, but this time I decided to let you know about the problem. Could someone write down how to fix a bug in Boost and put it somewhere I can find it on the website? Thanks, Jeffrey

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[string_ref] Don't rely on implicit conversation for operators
by Nicola Bizzoca 20 May '13

20 May '13

Hi, This is a follow up of "[string_ref] Add an equality operator between string_ref and char*" I'm sorry for the previous message, I'm started learning C++ and I'm making some errors Here the new topic: boost::string_ref rely on implicit conversation for using operators For example this operator: template<typename charT, typename traits> bool operator==(basic_string_ref<charT, traits> x, basic_string_ref<charT, traits> y) Is bad because if I write this: boost::string_ref("http") == "http" The compiler complains: error: no match for ‘operator==’ (operand types are ‘boost::basic_string_ref<char, std::char_traits<char> >’ and ‘const char [5]’) It can't find the correct overload because implicit conversion is considered after candidate templates have been considered boost::string_ref should offer overloads for string and const char* so it can be possible write code like boost::string_ref("boost") == "boost" && boost::string_ref("c++") == std::string("c++")

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[lockfree] arm / iOS builds against Boost.Atomic
by Rich E 19 May '13

19 May '13

Hello, I noticed today when moving my work from OS X / clang / libc++ to iOS / clang / libc++ that Boost.Lockfree must link against libboost_atomic.a to compile. This shouldn't be necessary, since there is std::atomic on iOS as well. If this is correct I can file a bug report, provide a test application, or both if requested. cheers, Rich

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[tti] Moving TTI to release
by Edward Diener 19 May '13

19 May '13

Do I have to do anything further to move TTI from the trunk to the release branch for Boost 1.54 ? If so, please inform me of it as I am happy that TTI can be part of the 1.54 release, and I believe that the cutoff date for new libraries is tomorrow. Edward Diener

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[gil] Ok to merge new gil's extension to release branch?
by Christian Henning 19 May '13

19 May '13

Hi, is it ok? The merge would include io, toolbox, numerics and some other changes to gil's code itself. Regards, Christian

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[trac] Request to add TTI library to trac system
by Edward Diener 18 May '13

18 May '13

Would the TTI library pleased be added to the Boost trac system ? I am the owner of the component and my trac ID is 'eldiener'. Edward Diener

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Getting regression test command lines
by Edward Diener 18 May '13

18 May '13

It is not possible in the regression tests I see on the Boost website to get the full command lines for a regression test. The reason for this is that the regression test uses a command response file and the contents of the command response are not being shown. Atypical example might be: cl /Zm800 -nologo @"D:\BoostRT\results\boost\bin.v2\libs\tti\test\test_has_data_compile.test\msvc-9.0~w\dbg\stdlb-stlpr-5.2~9\test_has_data_compile.obj.rsp Without knowing what the command response file contains it is impossible to know what the command options are for the test. This makes it very difficult to duplicate the reason for a failure in the online regression tests.

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[trac] No `tti` component
by Michel Morin 18 May '13

18 May '13

Hi, There is no `tti` component in trac yet. Thanks, Michel

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[1.54.0] [log] Permission to merge to release
by Andrey Semashev 17 May '13

17 May '13

Hi, I'd like to ask for permission to merge Boost.Log to the release branch. All test issues are resolved, although some MinGW testers haven't run the tests for 2 weeks and haven't updated the report. RDC-VC10 tester also didn't clean the previous test results so the report is not showing the actual results (other MSVC testers are green). The util_dynamic_type_dispatcher and util_static_type_dispatcher rows should be ignored, these tests were renamed to util_dynamic_type_disp and util_static_type_disp, respectively.

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