December 2009 - Boost-users - lists.preview.boost.org

Re: [Boost-users] asio: sys/epoll.h
by Pascal Kesseli 28 Dec '09

28 Dec '09

Ah, that could indeed do the trick! I will give it a shot immediately and report back here. Thanks a lot and best regards Pascal

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Problem with boost::any_cast on SUN CC 5.10
by Alexander Vinokur 28 Dec '09

28 Dec '09

Hi, I have the following problem. Here is some program. File myFile1.cpp #include <boost/any.hpp> int main() { long myLongValue = 123; long long myLongLongValue = 123; boost::any_cast<long>(myLongValue); boost::any_cast<long long>(myLongLongValue); return 0; } Compilation on machine1 machine1> uname -a SunOS machine1 5.10 Generic_127111-11 sun4v sparc SUNW,SPARC-Enterprise-T5220 machine1> CC -V CC: Sun C++ 5.9 SunOS_sparc Patch 124863-01 2007/07/25 machine1> CC -m64 -I/local64/boost_1_34_0 myFile1.cpp machine1> // No errors Compilation on machine2 machine2> uname -a SunOS machine2 5.10 Generic_139555-08 sun4u sparc SUNW,SPARC-Enterprise machine2> CC -V CC: Sun C++ 5.10 SunOS_sparc 128228-03 2009/11/05 Usage: CC [ options ] files. Use 'CC -flags' for details machine2> CC -m64 -I/local64/boost_1_34_0 myFile1.cpp "myFile1.cpp", line 7: Error: Could not find a match for boost::any_cast<boost::ValueType>(long) needed in main(). "myFile1.cpp", line 8: Error: Could not find a match for boost::any_cast<boost::ValueType>(long long) needed in main(). 2 Error(s) detected. Any suggestions? Thanks, Alex Vinokur AMDOCS > CUSTOMER EXPERIENCE SYSTEMS INNOVATION This message and the information contained herein is proprietary and confidential and subject to the Amdocs policy statement, you may review at http://www.amdocs.com/email_disclaimer.asp

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[GIL] planar view with different bit depth
by Eloi Du Bois 28 Dec '09

28 Dec '09

Hi all, I have a question. I am using gil to read exr image files (movie standard) and I would like to know can I make a planar view with n channels of different pixel bit depth... That sound weird but the exr standard allow users to put channels of different types ! For example: R = unsigned int 32 G = half float B = float A = byte Thank you, Eloi.

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[BGL] A* queue size not mutable
by Arnaud Masserann 26 Dec '09

26 Dec '09

Hi, I'm using the BGL to explore an implicit graph. At the beginning, I only have one node, and no arc. And I instanciate new nodes and their corresponding arc on-the-fly in the A* visitor ( in examine_vertex ). However, the A* algorithm internally uses this queue : MutableQueue Q(num_vertices(g), icmp, index_map); which means that I'm supposed to : - know how many vertices I'm gonna need during the search, which I don't - Instanciate them all... Any hints here ? Notes : I use astar_search_no_init, and property maps based on std::map so that put() can index it in a not-known-yet location. Btw, my color map type is std::map<NodeID,boost::default_color_type > (plus the wrapper around it). I feel that using "boost::default_color_type" is kind of a hack. Is it ? Thanks Arnaud Arnaud

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Re: [Boost-users] Dynamically creating new units
by Brandon Olivares 26 Dec '09

26 Dec '09

Hi, Oh, sorry, I forgot to specify that I was talking about the Boost.Units library. Brandon On 2009-12-25, Brandon Olivares wrote: > Hi, > > I posted before about having a problem with having so many units that it > takes forever to install. I was thinking about trying to perhaps > dynamically create only the ones I need, because I can't know that at > compile-time. > > Mostly it would be scaled units. For instance I might have the unit > meter, but might want to create a scaled unit, say like kilometer or > millimeter. > > Also though I wouldn't mind being able to create some of the > astronomical units when necessary, such as parsec or light year. But > in all cases, the base units already exist. > > What would be the best way to do this? > > Thanks, > Brandon > > -- > www.creatorspiritus.com > Blog and forum discussing living a Christ-centered life Follow me on > Twitter: http://twitter.com/devbanana Follow creatorspiritus.com on > Twitter: http://twitter.com/creatorspiritus -- Brandon www.creatorspiritus.com Blog and forum discussing living a Christ-centered life Follow me on Twitter: http://twitter.com/devbanana

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[Serialization] Unregistered_class exception
by elizabeta petreska 25 Dec '09

25 Dec '09

Hello And I am sorry for bothering again The last couple of weeks I am trying to implement saving projects future in my program with boost serialization. However it seems that it is more hard that I think :) Now I am getting unregistered_class exception all over the place First some info about what I am trying to do : I am developing a plugin dll , which is loaded in third party main program. My plugin , say MyPlugin.dll , contains serialization code ( non intrusive save/load pair ) for classes which are defined in third party dll , say A.dll. A.dll is suppiled with my third party main program. Both A.dll and MyPlugin.dll are laoded at runtime in my main program. Only MyPlugin.dll ( and not A.dll and main program ) links with boost 1.41.0 staticly, if this is relevant at all. And I am using Visual Studio 2005. I think that I am getting this unregistered_class exception because somehow I am getting weird behavior from typeid operator ( maybe some bug), for particular class form A.dll. Note that the class have virtual methods. That is if I say : std::string s1=typeid(ON_Brep).raw_name(); ON_Brep someBrepObj; std:string s2=typeid(someTypeObj).raw_name(); s1 and s2 are not the same string. I am doing the following : /////////////////////MyPlugin.cpp //all archive classes are included here namespace boost { namespace serialization { template<class Archive> inline void save(Archive & ar,const ON_Brep& t,const unsigned int version) { boost::serialization::void_cast_register<ON_Brep, ON_Geometry>( static_cast<ON_Brep*>(NULL), static_cast<ON_Geometry *>(NULL)); //save ON_Brep here } template<class Archive> inline void load(Archive & ar,ON_Brep& t,const unsigned int version) { boost::serialization::void_cast_register<ON_Brep, ON_Geometry>( static_cast<ON_Brep*>(NULL), static_cast<ON_Geometry *>(NULL)); //load ON_Brep here } } } BOOST_SERIALIZATION_SPLIT_FREE(ON_Brep) BOOST_CLASS_EXPORT_GUID(ON_Brep, "ON_Brep") void CommandFunction() { ON_Brep* brep=GetBrepObject(); boost::archive::xml_oarchive oa(ofs); oa & BOOST_SERIALIZATION_NVP(brep); // fails to save with uregistered_class exception } The unregistered_exception is thrown before control gets to my nonintrusive save function for my ON_Brep Actually the exception is thrown in oserializer.hpp in line 376 : const boost::serialization::extended_type_info * true_type = i.get_derived_extended_type_info(t); // here throws if(NULL == true_type){ boost::serialization::throw_exception( archive_exception( archive_exception::unregistered_class, true_type->get_debug_info() ) ); } get_derived_extended_type_info is trying to get the eti record for ON_Brep, but I think that that it gets it wrong, because of the weird typeid behavior. get_derived_extended_type_info(const T & t) const { // note: this implementation - based on usage of typeid (rtti) // only does something if the class has at least one virtual function. BOOST_STATIC_WARNING(boost::is_polymorphic<T>::value); return typeid_system::extended_type_info_typeid_0::get_extended_type_info( typeid(t) ); /////// Here the typeid(t) differs from typeid(ON_Brep) <------------------1 } The thing is when I export ON_Brep with BOOST_CLASS_EXPORT_GUID(ON_Brep,"ON_Brep") extended_type_info entry is inserted in the global map, just typeid(ON_Brep) is inserted in the global map But when control gets to <-----1 the typeid(t) is different than the typeid that is entered in the global map,and just looking in the global map fails, becuase I have different behavior when I apply typeid(ON_Brep).raw_name();//this gives me ".?AVON_Brep@@" ON_Brep someBrepObj; typeid(someBrepObj).raw_name();// this gives me ".?.?AVTL_Brep@@" Anyone have seen such a thing ? Thanks for any help

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help me with xpressive
by haccel 25 Dec '09

25 Dec '09

Cant compile in mingw ( QtCreator , Windows ) code with using boost xpressive. It talks " undeclared symbols - wsregex " . But with sregex ang cregex it works fine. Visual Studio compile wsregex fine , too. But GCC not. Found nex code in \boost\xpressive\xpressive_fwd.hpp - #if defined(BOOST_NO_CWCHAR) | defined(BOOST_NO_CWCTYPE) | defined(BOOST_NO_STD_WSTRING) # ifndef BOOST_XPRESSIVE_NO_WREGEX # define BOOST_XPRESSIVE_NO_WREGEX # endif #endif and later : #ifndef BOOST_XPRESSIVE_NO_WREGEX typedef basic_regex<std::wstring::const_iterator> wsregex; typedef basic_regex<wchar_t const *> wcregex; #endif What can i do? Thanx. -- View this message in context: http://old.nabble.com/help-me-with-xpressive-tp26842492p26842492.html Sent from the Boost - Users mailing list archive at Nabble.com.

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Dynamically creating new units
by Brandon Olivares 25 Dec '09

25 Dec '09

Hi, I posted before about having a problem with having so many units that it takes forever to install. I was thinking about trying to perhaps dynamically create only the ones I need, because I can't know that at compile-time. Mostly it would be scaled units. For instance I might have the unit meter, but might want to create a scaled unit, say like kilometer or millimeter. Also though I wouldn't mind being able to create some of the astronomical units when necessary, such as parsec or light year. But in all cases, the base units already exist. What would be the best way to do this? Thanks, Brandon -- www.creatorspiritus.com Blog and forum discussing living a Christ-centered life Follow me on Twitter: http://twitter.com/devbanana Follow creatorspiritus.com on Twitter: http://twitter.com/creatorspiritus

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Project using Boost.Units compiling slowly
by Brandon Olivares 25 Dec '09

25 Dec '09

Hi, I finally figured out how to use Boost.Units. But now it is compiling very slowly. It compiles in about 30 minutes on my local Windows machine using Cygwin, and in about 15 minutes on my remote CentOS server. There is very little code, but I am using a lot of units. Is there any way to speed it up? I don't know exactly how many units I'm using, because I have several macros for more easily defining them, but I know that there are many. Right now it is just a test program for testing out the units, but obviously I'll be expanding it soon and I'm worried that it is already taking so long to compile. Thanks, Brandon -- www.creatorspiritus.com Blog and forum discussing living a Christ-centered life Follow me on Twitter: http://twitter.com/devbanana Follow creatorspiritus.com on Twitter: http://twitter.com/creatorspiritus

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[serialization] version handling in {save|load}_construct_data
by JOAQUIN M. LOPEZ MUÑOZ 24 Dec '09

24 Dec '09

Hello, I've taken a look at how the version number is dealt with in Boost.Serialization collection serialization code: * The relevant code at saving time is: if(3 < ar.get_library_version()){ const unsigned int item_version = version< BOOST_DEDUCED_TYPENAME Container::value_type >::value; ar << BOOST_SERIALIZATION_NVP(item_version); } * At loading time, the equivalent code is: unsigned int item_version; ar >> BOOST_SERIALIZATION_NVP(count); if(3 < ar.get_library_version()) ar >> BOOST_SERIALIZATION_NVP(item_version); else item_version = 0; Can someone (aka Robert :-) ) shed some light on this bit? Why the version number has to be given such manual processing when this is not needed if, for instance, serializating values via the simple ar&value? I'm trying to do the equivalent thing in Boost.MultiIndex. Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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