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[Boost units] Derived units for specific_heat_capacity
by A Andrew 08 Nov '12

08 Nov '12

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ptr_map<U, T> with polymorphic U
by Victor Snyder 08 Nov '12

08 Nov '12

ptr_map<U, T> lets me map simple types to pointers-to-T, preserving polymorphic behavior of the mapped-to objects, and clearly stating that the ptr_map solely owns the pointed-to objects. I'd like to map pointers-to-U to pointers-to-T and have the map solely own the key objects as well as the mapped-to objects. ptr_map doesn't do this. I could map shared_ptrs-to-U to pointers-to-T, but then I lose the clear ownership semantics. Does anyone know of an easy workaround to get the behavior and semantics that I want, or is this more properly a feature request? Thanks!

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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.

2 1

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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