November 2012 - Boost-users - lists.preview.boost.org

pattern support for traversing inheritance chain
by Brian Budge 07 Nov '12

07 Nov '12

Hi all - I have a case where I have a largeish inheritance hierarchy. I will be calling an initialization function on all objects before using them in some fashion. Basically what I need to happen is when I call init() on a Foo the following would occur: void Foo::init() { super::init(); // now with the knowledge that anything I inherited is set up, I can set myself up... } It is not necessary for every call to implement init, in which case the behavior should be that the call is propagated up the inheritance chain (which it is by default in C++). In order to make this work, I need to write different code for "super" in every class implementation, which is a bit error prone. Even if I don't copy/paste, my brain might be on autopilot and type something further up the inheritance chain than it should be. Alternatively, I could require that each class provides a typedef for super, but I'm still relying on myself to remember to call super's init function. Is there anything in boost that would support this kind of hierarchy traversal (semi-)automatically? If there is not, are there suggestions for ways to implement this in a less error-prone fashion? Thanks, Brian

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[1.52] PDF Documentation build available
by John Maddock 07 Nov '12

07 Nov '12

The PDF build of Boost docs is now available for 1.52 from: https://sourceforge.net/projects/boost/files/boost-docs/1.52.0/ John.

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Virtual memory exhausted compile error with too many Boost state machine transitions
by Adlai Shawareb 06 Nov '12

06 Nov '12

All, We are getting the virtual memory exhausted error when compiling a Boost state machine file. If we cut back the number of state transitions in this state machine, we do not get the error, and the compile completes without errors. We are using Boost 1.49. Here is what we have done: 1) Allocated 4GB of memory to our Virtual Machine(it runs Ubuntu), and created a 4.5GB swap file. When I compile I look at the System Monitor dialog, and can see that the RAM memory is not even used up when we get the compile error. The virtual memory is never used. 2) I saw online that the 3.80 version of make had a bug that would cause this type of error. I've confirmed that we are using 3.81. I also tried 3.82, but get the same error. 3) I've confirmed that "ulimit -v" returns "unlimited" 4) Looking online, I saw a recommendation to add the following two lines to /etc/security/limits.conf. I've tried this but I still get the error. * hard rss unlimited * hard cpu unlimited 1) 2) 3) 4) 5) We have set up precompiled headers, and I've added SystemHSM.hpp, and associated Boost include files to our list of precompiled headers. However, I still get the error. 6) FYI - In the past we ran up against Boost's limit of 20 state transitions per state machine. To get around that, I've added the following to SystemHSM.cpp: #define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS // Discard the pre-generated headers and use preprocessor metaprogramming techniques to generate the necessary versions of the library components on the fly. #define BOOST_MPL_LIMIT_VECTOR_SIZE 50 // Increase the default (transition table) vector size beyond the standard limit of 20. #include <boost/mpl/vector.hpp> 1) 2) 3) 4) 5) 6) 7) FYI - We recently ran into an issue with the set size in the SystemHSM #define BOOST_FUSION_DONT_USE_PREPROCESSED_FILES #define FUSION_MAX_VECTOR_SIZE 30 #define FUSION_MAX_SET_SIZE 30 #include <boost/mpl/set.hpp> In addition I have looked for this type of error with gcc, but have not found anything concrete online. Any help would be appreciated!

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Known way to handle this?
by Lemay.Steve 06 Nov '12

06 Nov '12

Is there already a known [proper] way to correct his issue (shown below)? I had reported it during the beta - this occurs many times for various source. "QCC" -Wc,-ftemplate-depth-128 -DFD_SETSIZE=2048 -march=k8-sse3 -mtune=k8-sse3 -mmmx -msse3 -mfpmath=sse -mno-3dnow -mstackrealign -Y_cpp -Wc,-fPIC,-fnothrow-opt,-std=c++11,-std=gnu++11 -O3 -Wc,-finline-functions -Wc,-Wno-inline -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o "D:\boostBuild_QCC_1_52_0\boost\bin.v2\libs\serialization\build\qcc\release\link-static\target-os-qnxnto\threadapi-pthread\threading-multi\xml_iarchive.o" "libs\serialization\src\xml_iarchive.cpp" ...failed qcc.compile.c++ D:\boostBuild_QCC_1_52_0\boost\bin.v2\libs\serialization\build\qcc\release\link-static\target-os-qnxnto\threadapi-pthread\threading-multi\xml_iarchive.o... qcc.compile.c++ D:\boostBuild_QCC_1_52_0\boost\bin.v2\libs\serialization\build\qcc\release\link-static\target-os-qnxnto\threadapi-pthread\threading-multi\xml_archive_exception.o In file included from libs\serialization\src\xml_archive_exception.cpp:21:0: ./boost/archive/xml_archive_exception.hpp:35:44: error: looser throw specifier for 'virtual boost::archive::xml_archive_exception::~xml_archive_exception()' In file included from ./boost/archive/xml_archive_exception.hpp:25:0, from libs\serialization\src\xml_archive_exception.cpp:21: ./boost/archive/archive_exception.hpp:86:5: error: overriding 'virtual boost::archive::archive_exception::~archive_exception() throw ()' cc: d:/qnxsdk/qnxsdk6.5-001/host/win32/x86/usr/lib/gcc/i486-pc-nto-qnx6.5.0/4.7.2/cc1plus caught signal 1 Steven LeMay Game Platform Engineering International Game Technology 9295 Prototype Way Reno, NV 89521 Office: +1 775.448.8089 Mobile: +1 775.813.6676 steven.lemay(a)igt.com<mailto:steven.lemay@igt.com> This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. Any humorous implications are purely the result of misinterpretations provided by the reader.

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Question about boost::locale translations
by Bastien Montagne 06 Nov '12

06 Nov '12

Hi everybody! :) I’m currently trying to replace libintl (from gnu gettext) by boost::locale lib, in a (mostly) C program (blender, actually). To do so, I wrote a simplistic wrapper: #include <boost/locale.hpp> #include "boost_locale_wrapper.h" static boost::locale::generator gen; /* Called only once */ void boost_locale_init(const char *messages_path, const char *default_domain) { gen.add_messages_path(messages_path); gen.add_messages_domain(default_domain); gen.set_default_messages_domain(default_domain); } /* Called each time you change locale */ void boost_locale_set(const char *locale) { if (locale && locale[0]) { std::locale::global(gen(locale)); } else { std::locale::global(gen("")); } } const char* boost_locale_gettext(const char *msgid) { return boost::locale::gettext(msgid).c_str(); } (this wrapper lib is linked statically with the main app) But I'm facing a big problem: I would expect strings returned by boost::locale::gettext & co to be "const", i.e. that the char pointer gotten by boost::locale::gettext(msgid).c_str() would be const (and unique to a given locale/msgid/context/etc.), as it is with gnu gettext. But this is obviously not the case, as demonstrated by those prints (translated_msgid (address)): Serbe latin (Srpski latinica) (0x7fcaed0dac58) sr_RS@latin (0x7fcaee1e5628) Suédois (Svenska) (0x7fcaed0dac58) sv_SE (0x7fcaee1e5628) Am I missing something obvious here, or are returned string just not "const"? If so, how can a code like: MessageBoxW(0,pgettext <http://www.boost.org/doc/libs/1_49_0/libs/locale/doc/html/group__message.ht…>(L"File Dialog",L"Open?").c_str(),gettext <http://www.boost.org/doc/libs/1_49_0/libs/locale/doc/html/group__message.ht…>(L"Question").c_str(),MB_YESNO); (taken from boost doc) could work? I'm quite new to all this C++2C stuff (and to boost too), so please forgive me if this is a noob question... Best regards, Bastien

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Re: [Boost-users] Is this possible with boost? Linear Interpolation?
by rakesh patil 06 Nov '12

06 Nov '12

Hey Joel, Thanks for your quick reply. I check those links. If I am not mis-understood, that library can be used to compute intermediate values for a given range. In my case it is a polyline. The track of polyline must be maintained properly. The topology must not change here. Even if it changes, the change must not be a major one. So this one won't be of much use as of now. And before posting the question I checked Boost.Geometry. But I didn't find what I want. Any other possibilities other than writing my own code to do this? Thanks Regards

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Worth reporting warnings for 1.52?
by Lemay.Steve 06 Nov '12

06 Nov '12

I know the documentation says to expect warnings during compilation. So, are these boost 1.52 warnings worth reporting? Or are they typically tolerated? (gnu 4.7.2 C++11 enabled) Line 27367: ./boost/regex/v4/cpp_regex_traits.hpp:1069:34: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] Line 27372: libs\regex\build\..\src\regex.cpp:195:64: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] Line 27403: ./boost/regex/pending/object_cache.hpp:64:37: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] Line 27429: ./boost/regex/v4/regex_traits_defaults.hpp:329:73: warning: narrowing conversion of ''\37777777605'' from 'char' to 'const wchar_t' inside { } [-Wnarrowing] Line 27430: ./boost/regex/v4/regex_traits_defaults.hpp:331:64: warning: narrowing conversion of ''\37777777605'' from 'char' to 'const wchar_t' inside { } [-Wnarrowing] Line 27751: libs\thread\src\pthread\once.cpp:18:60: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] Line 27752: libs\thread\src\pthread\once.cpp:24:47: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] In file included from ./boost/regex/v4/regex_traits.hpp:39:0, from ./boost/regex/regex_traits.hpp:27, from ./boost/regex/v4/regex.hpp:39, from ./boost/regex.hpp:31, from libs\regex\build\..\src\winstances.cpp:30: ./boost/regex/v4/cpp_regex_traits.hpp: In instantiation of 'boost::re_detail::parser_buf<charT, traits>::pos_type boost::re_detail::parser_buf<charT, traits>::seekoff(boost::re_detail::parser_buf<charT, traits>::off_type, std::_Iosb<int>::seekdir, std::_Iosb<int>::openmode) [with charT = wchar_t; traits = std::char_traits<wchar_t>; boost::re_detail::parser_buf<charT, traits>::pos_type = std::fpos<_Mbstatet>; boost::re_detail::parser_buf<charT, traits>::off_type = long int; std::_Iosb<int>::seekdir = std::_Iosb<int>::_Seekdir; std::_Iosb<int>::openmode = std::_Iosb<int>::_Openmode]': ./boost/regex/v4/regex_split.hpp:168:1: required from here ./boost/regex/v4/cpp_regex_traits.hpp:117:4: warning: case value '0' not in enumerated type 'std::_Iosb<int>::seekdir {aka std::_Iosb<int>::_Seekdir}' [-Wswitch] ./boost/regex/v4/cpp_regex_traits.hpp:129:4: warning: case value '1' not in enumerated type 'std::_Iosb<int>::seekdir {aka std::_Iosb<int>::_Seekdir}' [-Wswitch] ./boost/regex/v4/cpp_regex_traits.hpp:123:4: warning: case value '2' not in enumerated type 'std::_Iosb<int>::seekdir {aka std::_Iosb<int>::_Seekdir}' [-Wswitch] Steven LeMay Game Platform Engineering International Game Technology 9295 Prototype Way Reno, NV 89521 Office: +1 775.448.8089 Mobile: +1 775.813.6676 steven.lemay(a)igt.com<mailto:steven.lemay@igt.com> This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. Any humorous implications are purely the result of misinterpretations provided by the reader.

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Is this possible with boost? Linear Interpolation?
by rakesh patil 06 Nov '12

06 Nov '12

Hello, I have a set of xy points(forms a polyline). What I want to do is, with the help of existing set of points, I need to redistribute the number of points such that the first and last point remain is same position. The intermediate points will change. For example, initally I have set of 10 points. I want to redistribute this polyline containing 10 points into 40 points. But the first and last point must remain as it is. Internal points may be adjusted. I guess interpolation should be used for this. What I want to know is that whether this is possible to do using boost c++ library? Thanks Regards

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[Boost.Test] Test Ordering?
by John M. Dlugosz 06 Nov '12

06 Nov '12

If I make unit*test*s in different source files, I need to declare a BOOST_AUTO_*TEST*_SUITEin each one, right? At link time, these appear in some undetermined order. How can I cause them to be run in the desired order instead?

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On Windows, how does Boost decide which MSVS version to use, if I have more than one installed?
by Ramon F Herrera 05 Nov '12

05 Nov '12

When I tried to build some app, I ended up with this error message: 1>LINK : fatal error LNK1104: cannot open file 'libboost_filesystem-vc80-mt-1_51.lib' I am sure it is due to the fact that I have a couple of Boost installations and 2 Versions of MSVS as well (2005 and 2010). NB: This is the way I build Boost on Windows: .\bootstrap.bat .\bjam.exe --with-date_time --with-filesystem --with-regex --with-system --stagedir=. --build-type=complete toolset=msvc The question is about that last parameter above. Does the install procedure: (a) Go to "Program Files" and takes a look at the name of the highest numbered MSVS folder? or (b) Is this info extracted from the Registry or something? TIA, -Ramon

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Boost 1.52.0 released!
by Marshall Clow 05 Nov '12

05 Nov '12

Release 1.52.0 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 numerous enhancements and bug fixes for existing libraries. For details, including download links, see http://www.boost.org/users/news/version_1_52_0 You can also download directly from SourceForge: http://sourceforge.net/projects/boost/files/boost/1.52.0/ To install this release on your system, see http://www.boost.org/doc/libs/release/more/getting_started/index.html Thanks, --The Boost release team Beman Dawes Daniel James Eric Niebler Marshall Clow Rene Rivera Vladimir Prus

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Linking problems with boost serialization and MinGW
by Florian Burkart 05 Nov '12

05 Nov '12

Hi, I am having a bit of trouble linking to boost serialization with MinGW. If I don't include -lboost_serialization-mgw46-mt-d-1_50 I get loads of undefined references, however, if I do include it, most disappear but I still get some, namely I get RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_14object_id_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_21object_reference_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_13class_id_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_23class_id_reference_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_13tracking_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o):/Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: more undefined references to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' follow Basically they all refer to "`boost::archive::archive_exception::archive_exception". boost serialization built fine with .\b2.exe --prefix=c:\Sys\boost\MinGW32\boost_1_50_0 toolset=gcc address-model=32 --with-serialization install The same code compiles and links just fine with gcc on linux and MSVC on windows. I haven't isolate the issue yet, so am afraid can't give a reproducible sample, but any ideas so far? Maybe look familiar? Thanks, Florian

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Symantec Norton shold not longer flag boost_signals-vc100-mt-gd-1_50.dll as suspicious
by Paul A. Bristow 05 Nov '12

05 Nov '12

I was slightly inconvenienced by having the new version of boost_signals-vc100-mt-gd-1_50.dll that I had just built flagged by Norton as suspicious and placed in 'quarantine'. "Name of detection given by Symantec product: suspicious.cloud.7.f" But I was impressed that reporting this to Symantec I got (in 48 hours) this response: "Dispute Submission [2985065] Symantec FP Incident Response falsepositives(a)symantec.com" saying that it was now whitelisted in the daily virus definitions update. Paul PS I have had bjam/b2 also flagged in the past saying it only had five users! --- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow(a)hetp.u-net.com

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[range] questions about documentation and usage
by Robert Ramey 05 Nov '12

05 Nov '12

I want to use Boost.Range in a bigger way. But I have a few problems with it. I think most of them are just issues of understanding and the writting of the documentation a) I see examples like std::vector<T> v; boost::range::find(v, 0); find(SinglePassRange& rng, Value val); BUT when looking at the documentation at http://www.boost.org/doc/libs/1_51_0/libs/range/doc/html/range/concepts/sin… I see only two valid expressions boost::begin(a) boost::end(a) where in this case a would be v which is of type std::vector<int>. BUT boost:begin(v) is NOT a valid expression for the above. Spelunking into the range header code reveals the following: template< class T > inline BOOST_DEDUCED_TYPENAME range_iterator<T>::type begin( T& r ) { #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) && \ !BOOST_WORKAROUND(__GNUC__, < 3) \ /**/ using namespace range_detail; #endif return range_begin( r ); } and template< typename C > inline BOOST_DEDUCED_TYPENAME range_iterator<C>::type range_begin( C& c ) { // // If you get a compile-error here, it is most likely because // you have not implemented range_begin() properly in // the namespace of C // return c.begin(); } This effectively means that the "Valid Expressions" for SinglePassRange part of the documenation should read: a.begin() a.end() Doesn't it. I would be interested to know if I got this wrong. b) I see the template iterator_range<ForwardTraversalIterator> - which seem to be to in an instance of what the ForwardRangeConcept should be. To me, the range documentation is out of whack. I can figure it out - but it's misleading - atleast to me. c) Another really annoying thing is that every thing is directly in the boost namespace. This breaks the convention that library headers are in boost/<library name> and in the namespace boost::<library name>. This creates a lot of opportunity for conflict. Robert Ramey

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Debug Assertion with MFC
by Yiğit Çağrı Akkaya 05 Nov '12

05 Nov '12

Hi, I have an MFC application. There are plenty of dll's written by us. In one dll module, we use boost. However, on start up of application, it throws several assertions about loading dll. I know assertions are available only for debug mode, but we want to get rid of every small problem in order to provide a stable release. I made web search and I found this thread: http://lists.boost.org/threads-devel/2009/06/0476.php This belongs to 2009 and Boost 1.39. We use Boost 1.48 and Visual Studio 2008 SP1. Thread says that this happens when MFC application statically linked to boost. Probably, nothing changed up to 1.48 because I found that line and commented it out(extern BOOL (WINAPI * const _pRawDllMain)(HANDLE, DWORD, LPVOID)=&dll_callback;). Is there a macro defined in boost to differentiate static and dynamic builds? If there is a macro, we are planning to wrap macro around that line. Or is there any better solution for this? Thanks in advance...

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[Program_options] Positional options are not parsed, "unrecognised option". A bug?
by Dmitry Shintyakov 04 Nov '12

04 Nov '12

Hello, everybody. I am having problems using Boost::Program_options library. I have a program, that have several optional keyword arguments, and 3 positional arguments. Keyword arguments are parsed well, but positional arguments are always causing an exception? saying: "unrecognised option" After spending 2 hours trying to find a problem, I decided to ask for help. I am using Boost 1.50.0-2, GCC 4.7.2 under Arch linux (32 bit). My example is almost exact copy from the tutorial, so I suspect that there is some bug. Example code (with all non-relevant code removed) follows. To test it, run it as following: ./a.out 123 123 test Expected behaviour is to see a line: Arguments: output=output.png width=123 height=123 Instead, I see this: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail:: error_info_injector<boost::program_options::unknown_option> >' what(): unrecognised option '1' ==Test code== #include <iostream> #include <boost/program_options.hpp> using namespace std; int main( int argc, char * argv[] ) { namespace po = boost::program_options; string output_file; po::options_description desc("converter [options] width height source"); desc.add_options() ("help", "Show help message") ("output,o", po::value<string>( &output_file )->default_value("output.png"), "Output file to put converted image data to. Default is output.png") ; po::positional_options_description pos_desc; pos_desc.add("width",1).add("height",1).add("input-file",1); po::variables_map vm; po::store( po::command_line_parser(argc, argv) .options(desc) .positional(pos_desc) .run() , vm ); po::notify( vm ); if( vm.count("help") ){ cout << desc <<endl; return 0; } if (!vm.count("width") || !vm.count("height") || !vm.count("input-file") ){ cerr<<"Error: width, weight and input file must be specified"<<endl; return 1; } cout << "Arguments: output="<<output_file << " width="<<vm["width"].as<string>() << " height="<<vm["height"].as<string>()<<endl; return 0; }

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MingW compilation errors
by Alice Gamewell 04 Nov '12

04 Nov '12

I have managed to build the boost libraries with b2 and the gcc toolset option. Alas, whenever I use a header which invokes such a library in Code::Blocks chained with MingW I get these errors: undefined reference to _Unwind_SiLj_Register undefined reference to _Unwind_SiLj_Unregister undefined reference to _Unwind_SiLj_Resume undefined reference to __gxx_personality_sj0 undefined reference to _WSACleanup@0 undefined reference to _WSAStartup@8 All but the last two repeatedly. I would really appreciate anyone who could point me out of this mess. Thanks!

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[Date Time] MSVC CRT assertion stops execution in debug mode
by Fumito Hamamura 03 Nov '12

03 Nov '12

Hi, I'm testing the code below using boost 1.50.0 and Visual C++ 2008. What I expected was, the ptime t doesn't throw an exception even though it doesn't get a valid date time string passed by the wstringstream ss. When it is compiled in Release mode, it works as expected, i.e. the program runs without an error, but when compiled in Debug mode, the program stops because debug assertion fails in _chvalidator in isctype.c, which is called by std::isspace. Is there a known workaround for this? Thanks, Fumito ----- #include <iostream> #include <string> #include "boost/date_time/posix_time/posix_time.hpp" int wmain(int argc, wchar_t* argv[]) { boost::posix_time::wtime_input_facet* dt_facet(new boost::posix_time::wtime_input_facet(L"%Y/%m/%d %H:%M")); std::wstringstream ss; boost::posix_time::ptime t; ss.imbue(std::locale(ss.getloc(), dt_facet)); ss << L"あいうえお"; ss >> t; return 0; } -----

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C++ announcements coming tomorrow
by Beman Dawes 03 Nov '12

03 Nov '12

Herb Sutter, the Convenor of the ISO C++ Standards Committee, will be making some announcements tomorrow likely to be of interest to C++ developers in general and Boosters in particular. The venue is a talk titled "The Future of C++" at the Microsoft Build Conference. While some of Herb's announcements will be specific to Microsoft, the key C++ initiatives involve Boost and the whole C++ community. Some of the ideas evolved from feedback Herb got at C++Now/BoostCon 2012 last May. I'll post a summary of the announcements tomorrow, but you can also watch the live stream at http://channel9.msdn.com at 12:45 PM Pacific time. For other time zones, see http://www.timeanddate.com/worldclock/fixedtime.html?iso=20121102T1945 --Beman PS: We don't usually post teasers like this on the Boost lists, but Herb asked that a notice be posted, and given the endless work he has put in on this over the summer, I couldn't say no.

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boost with mingw
by Kraus Philipp 03 Nov '12

03 Nov '12

Hello, I try to build Boost with MinGW / MSYS. I have found in the dokumentation http://www.boost.org/doc/libs/1_51_0/more/getting_started/windows.html that MinGW shell is not supported, but I can build bJam with booststrap.sh --toolset=mingw under the shell, but I get the error: mingw.jam: No such file or directory Can I build boost under MinGW shell or another shell with the MinGW gcc? Thanks Phil

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[Filesystem] Reverse traversal of boost::filesystem::path::const_iterator?
by Nat Linden 02 Nov '12

02 Nov '12

I've stumbled across some code in our code base that wants to walk up a fixed number of containing parent directories from the starting path. (It's in a Mac application bundle nested within another.) boost::filesystem::path::[const_]iterator is described as bidirectional. But boost::filesystem::path has no rbegin() or rend(). In libs/filesystem/test/path_test.cpp's iterator_tests(), I see, for a path variable named itr_ck, use of boost::prior(itr_ck.end()). That suggests that usage of this form would be legal: path mypath = /* ...something... */; for (path::const_iterator rcomp(mypath.end()), rend(mypath.begin()); rcomp != rend; --rcomp) { // ... use boost::prior(rcomp) ... } Am I correct? Given the way some containers implement end(), I always feel nervous about decrementing end(). I'm happy to see that Boost.Filesystem's own tests guarantee that usage; but is there anything in the documentation that would have assured me of that?

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boost::heap::skew_heap(1_51_0) ordered_iterator
by imns70 02 Nov '12

02 Nov '12

Hi This question pertains to boost::heap::skew_heap as defined here:- http://www.boost.org/doc/libs/1_51_0/doc/html/boost/heap/skew_heap.html Can you please help me understand what is the complexity of skew heap traversal using ordered_iterator. I am traversing over the heap, using ordered_iterator as shown in code below :- for(bk_heap::ordered_iterator it=buy_heap->ordered_begin();it!=buy_heap->ordered_end();it++) { /// some code here... } I suspect it to be O(n), but just want to make sure. Thanks in advance. -- View this message in context: http://boost.2283326.n4.nabble.com/boost-heap-skew-heap-1-51-0-ordered-iter… Sent from the Boost - Users mailing list archive at Nabble.com.

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advice with containers and data types
by Georg.Kellerer＠lfu.bayern.de 02 Nov '12

02 Nov '12

Hi all, i am a newbie to boost and hope, somebody here can give me an advice. i want to change the implementation of an existing container class in one of my projects. It is a container which for the moment is based on a very old roguewave version which should be replaced by boost. main features of this container are: - the container is based on a hashmap. - the key datatype can be string or int. - the value data type can be string, int, double, time, date, the container type itself and another container type. I thought about implementing the class based on a map container with boost:any as key and value type. is this possible? Or do you have other and even better recommendations for me? i am a bit confused about the great number of diferent containers and datastructures the boost library offers. Thanks in advance, Georg

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[phoenix] Using with Boost.Function.
by Robert Jones 02 Nov '12

02 Nov '12

Can anyone tell me the correct incantation to get the 'Not OK' lines to work? Thx, Rob. #include <boost/function.hpp> #include <boost/phoenix/core.hpp> #include <boost/phoenix/operator.hpp> #include <boost/phoenix/bind/bind_member_variable.hpp> #include <boost/phoenix/bind/bind_function.hpp> #include <boost/function.hpp> #include <list> struct S { int i; }; void f( std::list<S> & l, int i ) { using boost::phoenix::arg_names::_1; using boost::phoenix::arg_names::_2; // OK l.remove_if( bind( & S::i, _1 ) >= i ); *// Not OK.* * boost::function<bool( int, int )> pred = _1 >= _2;* * l.remove_if( bind( pred, _1, i ) );* }

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Iterator Range, sub range of a desired size
by David Kimmel 02 Nov '12

02 Nov '12

Is there a function in BOOST, given a starting point and a desired size, that returns iterators for a (sub) range? For example, given: a boost::circular_buffer which contains: 1 2 3 4 5 6 7 8 9 10 a starting point which is an iterator pointing to 5 and finally a desired size which is an int s = 4 The result of which would be iterators producing: 5 6 7 8 A possible implementation might be this (but I was hoping there was a BOOST version since I can't find an STD algorithm) template <typename Itr> std::pair<Itr, Itr> getWindowDown(Itr begin, Itr end, Itr start, const int windowSize) { // Down first, then up if need be const Itr bottom = (end - start > windowSize) ? (start + windowSize) : (end); const Itr top = (bottom - begin > windowSize) ? (bottom - windowSize) : (begin); return make_pair(top, bottom); } Thanks, -- View this message in context: http://boost.2283326.n4.nabble.com/Iterator-Range-sub-range-of-a-desired-si… Sent from the Boost - Users mailing list archive at Nabble.com.

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