- Boost-users - lists.boost.org

Help in calculating the size of a boost::unordered_map
by Ram 08 Nov '16

08 Nov '16

Hi, I would like to calculate the size of my filled up boost::unordered_map including the house keeping. I was thinking of sizeof(boost:unordered_map mymap). I asked this question on stackoverflow but they say that wont help. Can somebody tell me an easy way to find the size including the housekeeping that it takes? The boost::unordered_map stores a std::string as the key and a pointer to my class object as the value. Thanks, Ram

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An Asio based header-only asynchronous MySQL client library
by Cheng Lian 07 Nov '16

07 Nov '16

Hey all, Here is an Asio based header-only asynchronous MySQL client library called Amy (*A*synchronous *My*SQL). https://github.com/liancheng/amy In short, this library enables you to work with MySQL in both asynchronous and blocking ways. Links to examples are included in the README file. Haven't got time and energy to write comprehensive documents, though. The interesting thing is that, I wrote this library years ago as an exercise, open sourced it, and then basically forgot about it. However, recently an European developer contacted me and said that they used it in one of their game projects in production and it was "amazing". So I decided to spend some time to polish it a little bit and send it out here to see whether there are anyone else who are interested in it. Please let me know what you think about it. Thanks! Best, Cheng

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Problem compiling a code that uses Boost
by Fernando E Alva Manchego 04 Nov '16

04 Nov '16

Hello, I'm trying to compile a code that uses boost. The code is this one: http://people.eng.unimelb.edu.au/tcohn/t3.html The version of boost installed in the machine is: 1.41 The machine where I'm running this code is a Scientific Linux release 6.8 (Carbon). The detailed error message that I get can be seen here: http://pastebin.com/ADj4j6k0 Basically, the errors messages are like this: undefined reference to `boost::program_options::options_description::options_description(...) undefined reference to `boost::program_options::validation_error::get_template(...) -lboost_program_options is in the compilation line. And I've checked using 'locate' that /usr/lib64 (as appears in the compilation line) contains: /usr/lib64/libboost_program_options-mt.so /usr/lib64/libboost_program_options-mt.so.5 /usr/lib64/libboost_program_options.so /usr/lib64/libboost_program_options.so.5 I would really appreciate any help you could help me with this error. Best, Fernando

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Re: [Boost-users] build of datetime library fails
by LAMOTTE Thierry 03 Nov '16

03 Nov '16

Dear Andreas and Marcel, I checked my Visual Studio 13 Update : it is Update 5, so on this side it is ok. But Andreas you were perfectly right : as soon as I get Boost release 1.56, compilation completes with no warning and no error. I retry Boost 1.62 but it still does not work : it claims for a msvc internal error C1001. Sorry I won't keep investigating since I do not have time for that. I get at least one that works and for now it is enough to help me move on on my project matters that are quite far for boost. I greatly thank both of you for your help, I really appreciate. Best regards, Thierry Note: I do no know why I could not login with my email/password and reply directly on http://boost.2283326.n4.nabble.com/build-of-datetime-library-fails-td468 9472.html#a4689486

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build of datetime library fails
by LAMOTTE Thierry 03 Nov '16

03 Nov '16

Dear Boost community, For the purpose of a project that uses Boost libraries, I tried rebuild Boost but I failed. I would please need some help to complete that building. My context is Microsoft Windows 7, 32 bits, Visual Studio 13 (msvc-12), Boost 1.54.0 My goal is to the create static libraries : libboost_chrono, regex, system, thread and datetime. I initially used a tutorial from the Nordic's github to build Boost : https://github.com/NordicSemiconductor/pc-ble-driver My last try was with Boost 1.54.0 (the one used in the mentioned tuto), the build of datetime library fails (I attached the ouput) and frankly speaking I do not know where I should start looking for. If anyone could help me ? For note, at early stage, I tried with Boost 1.62.0, but the outcome was even worse, I gave up. Best regards, Thierry

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Microsoft and hana
by Dan Bloomquist 31 Oct '16

31 Oct '16

I'm sorry, I take it back. Things were fine until I included <boost/hana.hpp> I had been testing with <boost/hana/core/when.hpp> and the likes of: template<class T> constexpr T pi = T(3.1415926535897932385); // variable template which would not work until I patched. And to quote: In this release, we've updated the C++ compiler and standard library with enhanced support for C++11 and C++14 features, as well as preliminary support for certain features expected to be in the C++17 standard. The most notable compiler changes include complete support for generalized constexpr. Maybe next time.... Best, Dan.

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Microsoft and hana
by Dan Bloomquist 29 Oct '16

29 Oct '16

I did a quick search here and didn't find anything on this. But I just patched up VS2015 with 'Visual Studio "15" Preview 5' <https://www.visualstudio.com/news/releasenotes/vs15-relnotes> and downloaded boost_1_62_0 The compiler now handles variable templates and I've compiled and run some simple hana tests. I did have to comment line 74 in "..\boost\hana\config.hpp". I just thought I'd drop a heads up for those, like me, that wanted to use hana with the Microsoft compiler. Best, Dan.

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Re: [Boost-users] Boost Coroutine
by Emile Cormier 29 Oct '16

29 Oct '16

On 16-10-19 02:57 AM, Oliver Kowalke wrote: > > I'm not the maintainer of boost.asio, so I don't know if an upgrade is > planed - you might ask Christopher Kohlhoff. > This is a bit worrisome to me. We are using the Boost.Asio + Boost.Coroutine integration _extensively_ in our project. Did the API change from Coroutine1 to Coroutine2? Is it simply a matter of including from boost/coroutine2/xxx instead of boost/coroutine/xxx based on some preprocessor macro being defined?

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boost 1.50 unable to make regex_match to work
by MAURICE Jean 27 Oct '16

27 Oct '16

1) Hi Kai, I wrote const_iterator BOOST_REGEX_CALL end()const { // JME 27/10/16 pour savoir si on passe là, je crée une division par 0 en // esperant que le compilateur ne la détecte pas int ijme1, ijme2; ijme2 = 1; ijme1 = 2; --ijme2; ijme1 = ijme1 / ijme2; return (!this->m_status ? 0 : this->m_expression + this->m_expression_len); // return (this->m_status ? 0 : this->m_expression + this->m_expression_len); JME 26/10/16 } Hoping the divide by 0 error would be thrown but it never appears. So I don't think this bug is annoying me. 2) As I am new to boost and regex I tried a simple test : string pattern = "GHI+"; string chaineatester = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; boost::regex boost_pattern( pattern ); boost::smatch what; int errjme = boost::regex_match( chaineatester, what, boost_pattern ); if (errjme == 1) { *outputLog << "test 1: GHI+ a été trouvé" << endl; } else { *outputLog << "test 1: GHI+ n'a pas été trouvé" << endl; // what[0] contains the whole string // what[1] contains the response code // what[2] contains the separator character // what[3] contains the text message. *outputLog << " what[0]:" << what[0] << endl \ << " what[1]:" << what[1] << endl \ << " what[2]:" << what[2] << endl \ << " what[3]:" << what[3] << endl; } string pattern2 = "GHI"; boost::regex boost_pattern2( pattern2 ); errjme = boost::regex_match( chaineatester, what, boost_pattern2 ); if (errjme == 1) { *outputLog << "test 1bis: GHI a été trouvé" << endl; } else { *outputLog << "test 1bis: GHI n'a pas été trouvé" << endl; *outputLog << " what[0]:" << what[0] << endl \ << " what[1]:" << what[1] << endl \ << " what[2]:" << what[2] << endl \ << " what[3]:" << what[3] << endl; } And here is what I get : test 1: GHI+ n'a pas été trouvé what[0]: what[1]: what[2]: what[3]: test 1bis: GHI n'a pas été trouvé what[0]: what[1]: what[2]: what[3]: What am I doing wrong ? Jean

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[geometry] Stable and fast rtree serialize/de-serialize
by 邓尧 27 Oct '16

27 Oct '16

Hi all, How can I serialize/deserialize a Boost.Geometry rtree reliably and efficiently ? I tried the experimental rtree serialization support built-in (-DBOOST_GEOMETRY_INDEX_DETAIL_EXPERIMENTAL=1), I found that the implementation was unstable and failed to deserialize sometimes. I don't even know whether it corrupted any of the tree nodes. I also implemented a slow hack: save all tree nodes during serialization and rebuild the rtree during deserialization. I want something faster. Serialization time isn't important to me, I just need a faster deserialization (as fast as the experimental implementation) Thanks

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