September 2017 - Boost-users - lists.preview.boost.org

[gsoc] Change in Google Summer of Code admin
by Niall Douglas 08 Sep '17

08 Sep '17

Dear all, Google Summer of Code 2017 has ended with another successful summer of student coding with probably the highest calibre year we've ever seen. After four years as lead admin for Boost Summer of Code, my time has come to an end. I'll be making way for David Bellot, long time mentor at Boost GSoC and maintainer of Boost.uBLAS. Please join me in welcoming David as new lead admin. I'll be staying on as backup admin next summer to help David settle in. My time as Boost Summer of Code admin has certainly been eventful with lots of surprises, ups and downs. The fact these surprises did not turn into crises is due in large part to a few people in particular who went far beyond the call of duty: * Jon Kalb, who went to bat for the students repeatedly in multiple venues and finding tens of thousands of dollars when it was needed. * Boris Schäling, whom I replaced as lead admin and who acted as backup admin for some years, who also managed to arrange tens of thousands of dollars of sponsorship when it was needed most. * Bryce Adelstein Lelbach, for acting as backup admin these past few years. * Andrew Sutton, the lead GSoC admin before Boris, who gave such detailed and useful early advice and materials on how to best navigate the treacherous waters of Google Summer of Code! And finally to all the mentors who so generously volunteered their time, and to the students every single one of whom successfully finished their projects in my time as admin despite problems with sickness, deaths in close family etc. Some of those students have gone on to become mainstays of the C++ conference circuit, famous names in their own right. I'm sure they would have been so without Google Summer of Code, but I'd like to think that it helped bring them to Boost rather than them getting into C++ via elsewhere. Thank you students! Regards, Niall

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echo server modification causes undefined behaviour
by Peter Koukoulis 07 Sep '17

07 Sep '17

I'm a database developer and I'm using boost for the first time.I've copied the echo server & client example from the Boost website and modified it somewhat so that when I receive a SQL statement from the client I pass pass it onto a function that performs the db execution. Once executed Ireply back to the client how many rows were affected. The code works , if I send only a single request at a time from the synchronous client, so I modified the async server so that the read is a read_until.The change now crashes the server. Could somebody please help ?Attached is the code.

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[release] Boost 1.65.1
by Daniel James 07 Sep '17

07 Sep '17

Release 1.65.1 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 bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/history/version_1_65_1.html> You can also download directly from: <https://dl.bintray.com/boostorg/release/1.65.1/> To install this release on your system, see <http://www.boost.org/doc/libs/release/more/getting_started/index.html> Thanks to everyone who participated in this release. Thanks, -- The Boost Release Team Vladimir Prus Rene Rivera Marshall Clow Eric Niebler Daniel James Beman Dawes

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[Multi_Index] Mixing composite keys with chained pointer value types
by Nick Gordon 07 Sep '17

07 Sep '17

I have a multi-index container that I'm using to fulfill two search cases. The objects are all derived from `Base`, which is a pure virtual class. To store the `Derived` objects I'm using unique_ptrs as the container value type. However, I need to store the objects uniquely on a composite of a member string, and an enum type used for runtime reflection without dynamic_cast-ing or typeid-ing. So, I want to use a composite key to be unique over both of these things. However, it doesn't compile (why else would I be posting). The minimum source code I can construct to fail using GCC 5.4.0 or Clang 3.9.1 with Boost 1.62 is attached in test.cpp, and the compilation error from my version of clang is attached as compilation-error.txt. I compile it with `clang++ --std=c++14 test.cpp`. I'm not familiar with how the library works, but my surface-level understanding is it seems that the chained_ptr is trying to act on the value type, but the operand being passed is actually one of the composite key expressions. I couldn't find much about how these two mechanisms interact. In my case it's not strictly necessary that I have this type-determining enum value, but it's cheaper than dynamic casting, and it makes my life simpler, because there are also many cases where we want to print the class name of the derived instance. There are other approaches, but I don't want to use them if I can get this working :) -Nick Gordon

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Delete and free all elements of ptr_vector
by Florian Lindner 07 Sep '17

07 Sep '17

Hello, in my project we have a simple ptr_vector that has a member function: void deleteElements () { for ( CONTENT_T * elem : _content ) { assertion ( elem != NULL ); delete ( elem ); } } I want to replace this ptr_vector with boost::ptr_vector. However, I haven't found a way to delete and free all pointers stored in the container. How can I do that? Thanks, Florian

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[Test] Can't build Boost Test 1.65.0 with Visual Studio 2013
by Kerry, Richard 07 Sep '17

07 Sep '17

I've just tried building Boost Test 1.65.0 with Visual Studio 2013 (ie msvc-12) and it doesn't seem to work, showing a compiler internal error. Can anyone advise what I might be doing wrong. Or whether a newer (or older) release fixes this issue. I've also tried 1.64.0 with an identical looking failure. Details below. Regards, Richard. I run : >b2 --with-test (as in the docs, though I'm not specifying address-model, link, --prefix or install. Having tried address-model and link as documented they appear to show the same fault). And then, after some messages, including "- test : building" (and nothing else listed as building), I get some messages starting: ...patience... ...found 1239 targets... ...updating 28 targets... compile-c-c++ bin.v2\libs\chrono\build\msvc-12.0\debug\link-static\threading-multi\chrono.obj chrono.cpp C:\Users\kerryr01\Downloads\Boost\boost_1_65_0\boost/type_traits/common_type.hpp(43) : fatal error C1001: An internal error has occurred in the compiler. (compiler file 'msc1.cpp', line 1325) To work around this problem, try simplifying or changing the program near the locations listed above. Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information Internal Compiler Error in C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\BIN\cl.exe. You will be prompted to send an error report to Microsoft later. call "C:\Users\kerryr01\AppData\Local\Temp\b2_msvc_12.0_vcvarsall_x86.cmd" >nul cl /Zm800 -nologo @"bin.v2\libs\chrono\build\msvc-12.0\debug\link-static\threading-multi\chrono.obj.rsp" ...failed compile-c-c++ bin.v2\libs\chrono\build\msvc-12.0\debug\link-static\threading-multi\chrono.obj... This is followed by a number of similar blocks of messages relating to: chrono.obj, thread_clock.obj, process_cpu_clocks.obj, cpu_timer.obj, auto_timers_construction.obj, execution_monitor.obj and others. [Blue line] Richard Kerry BNCS Engineer, SI SOL Telco & Media Vertical Practice T: +44 (0)20 3618 2669 M: +44 (0)7812 325518 4 Triton Square, Regent’s Place, London NW1 3HG richard.kerry(a)atos.net<mailto:richard.kerry@atos.net> [Atos logo] This e-mail and the documents attached are confidential and intended solely for the addressee; it may also be privileged. If you receive this e-mail in error, please notify the sender immediately and destroy it. As its integrity cannot be secured on the Internet, the Atos group liability cannot be triggered for the message content. Although the sender endeavours to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted.</ Atos, Atos Consulting, Worldline and Canopy The Open Cloud Company are trading names used by the Atos group. The following trading entities are registered in England and Wales: Atos IT Services UK Limited (registered number 01245534), Atos Consulting Limited (registered number 04312380), Atos Worldline UK Limited (registered number 08514184) and Canopy The Open Cloud Company Limited (registration number 08011902). The registered office for each is at 4 Triton Square, Regent’s Place, London, NW1 3HG.The VAT No. for each is: GB232327983. This e-mail and the documents attached are confidential and intended solely for the addressee, and may contain confidential or privileged information. If you receive this e-mail in error, you are not authorised to copy, disclose, use or retain it. Please notify the sender immediately and delete this email from your systems. As emails may be intercepted, amended or lost, they are not secure. Atos therefore can accept no liability for any errors or their content. Although Atos endeavours to maintain a virus-free network, we do not warrant that this transmission is virus-free and can accept no liability for any damages resulting from any virus transmitted. The risks are deemed to be accepted by everyone who communicates with Atos by email.

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flat_(multi)map/set and Compare::is_transparent
by TONGARI J 06 Sep '17

06 Sep '17

Hi, Since C++14, the standard introduces transparent comparators for heteregeneous lookup, but seems that the Boost's flat counterparts don't take advantage of this yet. Is there any plan to support transparent comparators? Thanks.

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[Boost.Container] Boost.Container support for transparent comparators
by dariomt＠gmail.com 05 Sep '17

05 Sep '17

Hi, I see this trac ticket [1] with a feature request, and I'd like to know if there has been any progress on it. It doesn't look like it is in the latest release yet. Thank you! [1] https://svn.boost.org/trac10/ticket/11780

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Boost 1.65.2 Release Candidate 2
by Daniel James 03 Sep '17

03 Sep '17

The second release candidates for the 1.65.1 release are now available at: <https://dl.bintray.com/boostorg/release/1.65.1/> The SHA256 checksums are as follows: df7bea4ce58076bd8e9cd63966562d8cf969b431e1c587969e6aa408e51de606 boost_1_65_1_rc2.7z 9807a5d16566c57fd74fb522764e0b134a8bbe6b6e8967b83afefd30dcd3be81 boost_1_65_1_rc2.tar.bz2 a13de2c8fbad635e6ba9c8f8714a0e6b4264b60a29b964b940a22554705b6b60 boost_1_65_1_rc2.tar.gz d1775aef807bd6a14077b450cce2950d8eacd86aaf51015f79e712917f8cc3c2 boost_1_65_1_rc2.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.

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[release] Boost 1.65.1 Release Candidate 1
by Daniel James 01 Sep '17

01 Sep '17

The release candidates for the 1.65.1 release are now available at: <https://dl.bintray.com/boostorg/release/1.65.1/> The SHA256 checksums are as follows: 9b440d8167043c8d70326d8a5d4df98a59abb40be7d68f51e75ea95ea24d84f3 boost_1_65_1_rc1.7z fbd5663c748a88479adb4106c8a12009b149e602dec4b40a4a778381a33cf3ce boost_1_65_1_rc1.tar.bz2 b1b18d658cc0ff8a5030b29f4ed41de1826281fcb52fc1073b106c5802a570bd boost_1_65_1_rc1.tar.gz 542624352b2c3fd6a76c98624f90d2c0e62dd810ec6cc9fdae831677c7aa1fbf boost_1_65_1_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.

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