July 2015 - Boost-users - lists.preview.boost.org

math.quaternion design issues
by Matwey V. Kornilov 29 Jul '15

29 Jul '15

Hello, I am facing the following performance issues due to internals of quaternion. abs(q) function is quite slow, and most of the time (according to callgrind) is taken to create valarray which is easily unnecessarily here. valarray requires doing malloc and free, because it is dynamic container, at the same time the size of quaternion is 4 and it is fixed. So, was was the purpose to use std::valarray internally?

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input stream error exception during deserializing
by breadbread1984 29 Jul '15

29 Jul '15

I am using xml_oarchive/iarchive to serialize and deserialize a graph. I can serialize successfully but cant deserialize from the output file. An exception of input stream error is throwed out when I deserialize from the file. I paste a small program which can reproduce the problem [here] (http://www.rapidshare.com.cn/jHQIrOv). How could I solve the problem. Thx in advance.

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boost ptree XML parsing for special character
by Uthpal Urubail 29 Jul '15

29 Jul '15

Experts, I am looking for the help in parsing special characters in XML using boost. Original Text: <module>'Admin'</module> Exported Text: <module>'Admin'</module> Using the below code: ptree xmlTree; read_xml("org.txt",xmlTree,boost::property_tree::xml_parser::trim_whitespace); std::string filePath("outFile.txt"); xml_writer_settings<char> settings(' ', 4); boost::property_tree::write_xml(filePath, xmlTree, std::locale(),settings); Any help is highly appreciated Regards, UJ

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building & testing boost with Visual Studio 2015
by Danny K 28 Jul '15

28 Jul '15

I've built boost 1.58 for Visual Studio 2015 RTM. I would like to run the regression tests and submit the results. I am unsure how to do the tests Would someone point me to the documentation about these steps or just let me know what they are? Boost build doesn't know the compiler name. Where do I add that in the bjam scripts? Respectfully, Danny

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Boost.DLL formal review result
by Vladimir Prus 28 Jul '15

28 Jul '15

The Boost.DLL library is accepted. Congratulations to Antony, and thanks for everybody who reviewed the library! The votes were as follows: - Ralf Globisch - Yes - Klaim - Joël Lamotte - Yes - Niall Douglas - Yes, conditionally - John P Fletcher - Yes - Bjorn Reese - Yes - Edward Diener - Yes - Rodrigo Madera - Yes - Richard - Yes I'd like to also thank Thomas Trummer, Rob Stewart and Ion Gaztañaga for their contribution to review. The key suggestions from the review are listed below. None is critical enough to become a formal prerequisite, or require a mini-review. The library can be added when Antony feels its ready. Naming ----------- There was a concern that "DLL" might sound windows specific, and search for best terminology. This does not seem all that important, as soon as documentation introduces the terminology it uses, and is consistent. OSX support ------------------- The library was found not to work on OSX; I believe this issue was already fixed off-list with help from Rodrigo. Documentation ---------------------- Several people requested improvements. Bjorn and John, in particular, pointed out specific issues. This seems to be the post important change prior to adding the library. Dependencies on Boost and system headers ---------------------------------------------------------------- It was suggested that the library does not depend on other Boost C++ Libraries. While it might be helpful to some users, I find it logically impossible for a Boost formal review to request that dependencies on Boost libraries be removed. It was also mentioned that Boost.DLL is header-only library and includes system headers that can bring a lot of symbols and maybe macros. I don't think an actual problem was reported, though, and there is no way to avoid the problem while staying header-only. It's up to the author to consider these suggestions and do something, or don't do anything. Continuous integration -------------------------------- There was a recommendation from Niall to improve CI of the library, including static analysis, valgrind, Windows CI, showing CI status in documentation and so forth. These are good suggestions. At the same time, they are not specific to Boost.DLL, and it's not the goal of a formal review to create new generic development process requirements. Many existing libraries of indisputably high quality do not have these requested mechanisms. Therefore, the author can act on these suggestions as he sees fit. Thanks, -- Vladimir Prus http://vladimirprus.com

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Re: [Boost-users] unsupported version problem of serialization of graph
by breadbread1984 28 Jul '15

28 Jul '15

I created a minimum runnable example and posted it [here] (http://www.rapidshare.com.cn/Bq95n2v). The serialized graph file is enclosed as well. The file is generated with the same version of graph library. Could you help to find the problem? thx! > Date: Tue, 28 Jul 2015 10:51:36 +0000 > From: Marcin Zalewski <marcin.zalewski(a)gmail.com> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] unsupported version problem of > serialization of graph > Message-ID: > <CAB8upqL05cQ9GruRGnujo6vczg6_7CJZe=bxbGaQqDt=eNDw3w(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Could you post a minimum runnable example? > > On Tue, Jul 28, 2015 at 6:47 AM breadbread1984 <breadbread1984(a)163.com> > > wrote: > > I am using boost graph library. I can serialize the graph successfully. > > But > > when deserialized a graph from the file, an unsupported version exception > > was > > throwed out. The Graph structure is pasted [here] > > (http://codepad.org/m7F21t4j). what shall I do to solve the problem. Thx! > > > > _______________________________________________ > > Boost-users mailing list > > Boost-users(a)lists.boost.org > > http://lists.boost.org/mailman/listinfo.cgi/boost-users > >

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Problem with boost::asio and boost::coroutine.
by Иван Бобев 28 Jul '15

28 Jul '15

This is my first post so sorry if it is not in the appropriate form. I have trouble with specific *boost::asio* and *boost::coroutine *usage pattern. I have a multi-thread application which uses *boost::asio* and *boost::coroutine* via its integration in *boost::asio*. Every thread has its own *io_service* object. The only shared state between threads are connection pools which are locked with *mutex* when connection is get or returned from/to the connection pool. When there is not enough connections in the pool I push infinite *asio::steady_tiemer *in internal structure of the pool and asynchronously waiting on it and I yielding from the couroutine function. When other thread returns connection to the pool it checks whether there is waiting timers, it gets waiting timer from the internal structure, it gets its *io_service* object and posts a lambda which wakes up the timer to resume the suspended coroutine. I have random crashes in the application. I try to investigate the problem with *valgrind*. It founds some issues but I cannot understand them because they happen in *boost::coroutine* and *boost::asio *internals. I posted two questions in *stckoverflow *with extract from my code and from valgrind and *GDB* output. The first link is with original question with extracts from my source and the second one contains proof of concept application aimed to investigate the problem in isolation. Can someone help me explaining what is my mistake which causes those problems? http://stackoverflow.com/questions/31610415/what-causes-a-random-crash-in-b… http://stackoverflow.com/questions/31639888/whats-wrong-with-this-boostasio…

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Filesystem library and virtual
by Olivier Tristan 28 Jul '15

28 Jul '15

Hi Guys, I'm wondering if the possibility to handle custom filesystem is planned at some point in the Filesystem library ? My goal is to manage a virtual filesystem contained in a "big file" or in an archive in a transparent way with the other files on the system. Thanks, -- Olivier Tristan Research & Development www.uvi.net

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Betweenness Centrality Test
by Mayank Bakshi 28 Jul '15

28 Jul '15

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unsupported version problem of serialization of graph
by breadbread1984 28 Jul '15

28 Jul '15

I am using boost graph library. I can serialize the graph successfully. But when deserialized a graph from the file, an unsupported version exception was throwed out. The Graph structure is pasted [here] (http://codepad.org/m7F21t4j). what shall I do to solve the problem. Thx!

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