August 2009 - Boost-users - lists.boost.org

Re: [Boost-users] include issues
by Shaolin 20 Aug '09

20 Aug '09

Hi Guys I am having problems with includes. I have the boost folder in my c++ program folder and use the following include statement to use the thread.hpp file: #include "boost/thread/thread.hpp" However, everytime I compile (g++ myprogram.cc) I get the following error message: boost/thread/thread.hpp: No such file or directory Where am I going wrong ? I just downloaded the foleder and moved it to my c++ application dir.

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[Serialization : decending compatibility] Additional attributes prevent de-serialization by previous
by francoisramond＠gmail.com 20 Aug '09

20 Aug '09

Hello, I work on an industrial application which uses XML Boost Serialization as a way to store and retrieve production scheduling solutions from XML files. I've been using Serialization for years and I really enjoy the ease of use and the flexibility it provides. Recently, I released a new version (say V2) of that application, in which some C++ classes have additional attributes of new classes with respect to the previous version (V1). The new software (V2) can still read files serialized by the earlier version V1 (ascending compatibility), but XML files serialized by V2 cannot be read by V1. I guess Boost Serialization wasn't designed for such "descending compatibility", nevertheless, during industrial production some unexpected bug on V2 might require to use V1 again (as it is stable), without loosing the scheduling solutions generated by V2. From an XML file generated by V2, I somehow managed to remove the parts XML associated to the new attributes (the additional information can be skipped), and re-number some class_id to make the file readable by V1, but this is quite time-consuming, and I can't automate this process since the numbering of class_id depends on the solution serialized. Any idea to make V2 serialized files readable by V1, either by modifying V2 or by an automated process to edit the files (I can't bring any modification to the source code of V1) would be really appreciated. Thanks for reading till here and, hopefully, for your help, François

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Inheriting from boost::function
by joel 20 Aug '09

20 Aug '09

Is it ok to inherit from boost::function or does its impelemtantion prohibits that ? -- ___________________________________________ Joel Falcou - Assistant Professor PARALL Team - LRI - Universite Paris Sud XI Tel : (+33)1 69 15 66 35

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[thread] lock(Iterator,Iterator) bug?
by strasser＠uni-bremen.de 20 Aug '09

20 Aug '09

according to this point in the library documentation: http://www.boost.org/doc/libs/1_39_0/doc/html/thread/synchronization.html#t… there are, among others, these non-member functions on Boost.Thread: template<typename ForwardIterator> void lock(ForwardIterator begin,ForwardIterator end); template<typename Lockable1,typename Lockable2> void lock(Lockable1& l1,Lockable2& l2); this example: vector<mutex> vec; lock(vec.begin(),vec.end()); fails on gcc 4.3.2, complaining that the vector iterator doesn`t have members named, lock(), unlock(), ... after looking at the source I`m not even sure how this is supposed to work. the implementation seems to try to differentiate between Lockable and ForwardIterator with this and other templates like it: template<typename T> struct has_member_lock{ typedef char true_type; struct false_type{ true_type dummy[2]; }; template<typename U> static true_type has_member(U*,void (U::*dummy)()=&U::lock); static false_type has_member(void*); BOOST_STATIC_CONSTANT(bool, value=sizeof(has_member_lock<T>::has_member((T*)NULL))==sizeof(true_type)); }; it looks like it tries to exploit SFINAE but it does so with a default argument that is not always resolvable. an old discussion on the boost mailing list about a has_member type trait seems to confirm that there is no portable way to do that and at the time only vc++ accepted that kind of code. but the only requirement placed on including this code is: #if defined(BOOST_NO_SFINAE) || \ BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600)) || \ BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590)) am I missing something?

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Re: [Boost-users] shared_ptr on template class
by hweekuan 20 Aug '09

20 Aug '09

hi i would have done the same. have not try it on my machine though 在 20-Aug-2009 12:21 AM 時，Roman Shmelev <rshmelev(a)gmail.com> 寫到： Probably a bit offtopic, but I do the following when working with templated classes: typedef MyClass<P1> me; typedef boost::shared_ptr<me> pointer; so, later everything will depend on "me", for example: return pointer(new me); Also, this code could be reused when creating other classes. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Re: [Boost-users] [Proto] Building a mpl::vector from an expression
by christophe henry 20 Aug '09

20 Aug '09

Eric Niebler wrote: > #include > #include > #include > #include > #include > #include > namespace proto = boost::proto; > namespace mpl = boost::mpl; > using proto::_; > > namespace My > { > struct my_tag {}; > > template > struct attribute_ > { > BOOST_PROTO_BASIC_EXTENDS( > proto::terminal::type > , attribute_ > , proto::default_domain > ) > }; > > attribute_<> const attribute = {{}}; > > struct BuildAttributes > : proto::make< > mpl::pop_front< > proto::fold_tree< > _ > , mpl::vector0<>() > , mpl::push_back() > > > > > > > {}; > } > > int main() > { > mpl::vector3 x = > My::BuildAttributes()( > My::attribute << int() << std::string() << bool() > ); > } > > HTH, Hi Eric, It does! It is way more elegant than what I came up with. I can even add a few features (like an optional end) inside and it still compiles much faster. Thanks a lot, Christophe _________________________________________________________________ With Windows Live, you can organize, edit, and share your photos. http://www.microsoft.com/middleeast/windows/windowslive/products/photo-gall…

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[boost][thread] synchronization fails - why?
by Alexander Heinrich 20 Aug '09

20 Aug '09

Hi, I've written a small logging class which I use for debugging in a multithreaded environment. I.e. different concurrent (boost) threads may instantiate an object of class logmsg, which amongst other things writes some message to the console. To synchronize the output I lock a global mutex whenever the logmsg constructor is invoked. Unfortunately it simply doesn't work. I still end up with output from different threads being mixed up almost as if there was no synchronization. I write 'almost' because if I remove the locking it's actually getting worse (crazy, huh). I added the code for allocating the console (it's an MFC project), because I believe it could have something to do with it, since the console itself is running in a separate (non-boost) thread. --- FILE* pConsole; boost::mutex consoleMutex; class logmsg { public: logmsg(const void* source, const char* msg, ...); }; logmsg::logmsg(const void* source, const char* msg, ...) { boost::mutex::scoped_lock lock(consoleMutex); if (!pConsole) create_console(); cout << msg << endl; } void create_console() { AllocConsole(); int hConsole = _open_osfhandle( (long)GetStdHandle(STD_OUTPUT_HANDLE), _O_TEXT ); pConsole = _fdopen(hConsole, "w"); setvbuf(pConsole, NULL, _IONBF, 0); //disables buffering *stdout = *pConsole; } --- Best regards, Alex

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can you give me access to the sandbox?
by Chris Hite 20 Aug '09

20 Aug '09

My complete name is Christopher Hite. I currently work at RTS. I'm supposed to fix this: https://svn.boost.org/trac/boost/ticket/3339 I can start with a private checkout and relocate to a sandbox branch when you give me access. Chris

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shared_ptr on template class
by Gao, Yi 20 Aug '09

20 Aug '09

Hi All, //////In short: If I have a templated class A<T>, within it, I want to typedef shared_ptr to it self, should I write: typedef shared_ptr< A<T> > PointerType; or typedef shared_ptr< A > PointerType; ? //////In more detail I have: template< typename T> class A { public: typedef shared_ptr< A<T> > PointerType; // or typedef shared_ptr< A > PointerType; // Further more static PointerType New() { return PointerType(new A<T>); // or return PointerType(new A); } }; Could I know if there's difference in between? Thanks! Yi Gao

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Re: [Boost-users] C1001 ice with date/time and Boost 1.38
by himanshu.agarwal＠rbs.com 20 Aug '09

20 Aug '09

> Dear all, > > I just downloaded Boost 1.38 and got ice with VStudio 2003 and sp1: > > c:\Work Sdk\boost_1_38_0\boost\date_time\gregorian\conversion.hpp(43) : fatal > error C1001: INTERNAL COMPILER ERROR > (compiler file 'msc1.cpp', line 2708) > Please choose the Technical Support command on the Visual C++ > Help menu, or open the Technical Support help file for more > information > > It took me 3 hours to solve but it seems that if the /FR (Include All Browse > Information) is on, this error is generated. Hi I also encountered the same problem, tried this solution. This worked for one of my project, but not for other one. On looking at development code of boost, It appears that they might have solved this in new version Tried that code and it worked Here is the solution: Create a file with name "boost_conversion.h" and contents given below and include it before any boost include in you code boost_conversion.h ____________________________________________________________________________________________________ /* //////////////////////////////////////////////////////////////////////////////////////////// This file is a hack to boost_1_37\boost\date_time\gregorian\conversion.hpp file When boost_1_37\boost\date_time\gregorian\conversion.hpp is compiled under Visual Studio 2003.NET foillowing error appear: fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line 2708) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information The same issue is also reported on boost-user group, please refer followin hyperlink: http://archive.netbsd.se/?ml=boost-users&a=2009-02&t=9851835 This issue might solve in boost 1.40 version. This code is modified from boost taking code from development version of boost //////////////////////////////////////////////////////////////////////////////////////////// */ //Enable this file only for VS 2003.NET Compiler #if _MSC_VER >= 1310 and _MSC_VER < 1400 #ifndef _CUSTOM_GREGORIAN__CONVERSION_HPP___ #define _CUSTOM_GREGORIAN__CONVERSION_HPP___ /* Copyright (c) 2004-2005 CrystalClear Software, Inc. * Use, modification and distribution is subject to the * Boost Software License, Version 1.0. (See accompanying * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) * Author: Jeff Garland, Bart Garst * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ */ #include <exception> #include "boost/date_time/gregorian/gregorian_types.hpp" #include "boost/date_time/c_time.hpp" #if defined(USE_DATE_TIME_PRE_1_33_FACET_IO) # if defined(BOOST_DATE_TIME_INCLUDE_LIMITED_HEADERS) # include "boost/date_time/gregorian/formatters_limited.hpp" # else # include "boost/date_time/gregorian/formatters.hpp" # endif // BOOST_DATE_TIME_INCLUDE_LIMITED_HEADERS #else # include <sstream> # include "boost/date_time/gregorian/gregorian_io.hpp" #endif // USE_DATE_TIME_PRE_1_33_FACET_IO namespace boost { namespace gregorian { //! Converts a date to a tm struct. Throws out_of_range exception if date is a special value inline std::tm to_tm(const date& d) { if (d.is_special()) { std::string s = "tm unable to handle "; switch (d.as_special()) { case date_time::not_a_date_time: s += "not-a-date-time value"; break; case date_time::neg_infin: s += "-infinity date value"; break; case date_time::pos_infin: s += "+infinity date value"; break; default: s += "a special date value"; break; } boost::throw_exception(std::out_of_range(s)); } std::tm datetm; boost::gregorian::date::ymd_type ymd = d.year_month_day(); datetm.tm_year = ymd.year-1900; datetm.tm_mon = ymd.month-1; datetm.tm_mday = ymd.day; datetm.tm_wday = d.day_of_week(); datetm.tm_yday = d.day_of_year()-1; datetm.tm_hour = datetm.tm_min = datetm.tm_sec = 0; datetm.tm_isdst = -1; // negative because not enough info to set tm_isdst return datetm; } //! Converts a tm structure into a date dropping the any time values. inline date date_from_tm(const std::tm& datetm) { return date(static_cast<unsigned short>(datetm.tm_year+1900), static_cast<unsigned short>(datetm.tm_mon+1), static_cast<unsigned short>(datetm.tm_mday)); } } } //namespace boost::gregorian //this will disable original boost gregorian conversion hpp file #define _GREGORIAN__CONVERSION_HPP___ #endif //_CUSTOM_GREGORIAN__CONVERSION_HPP___ #endif//_MSC_VER >= 1310 and _MSC_VER < 1400 ____________________________________________________________________________________________________ Regards Himanshu Agarwal agarwal.himanshu502(a)gmail.com *********************************************************************************** The Royal Bank of Scotland plc. Registered in Scotland No 90312. Registered Office: 36 St Andrew Square, Edinburgh EH2 2YB. Authorised and regulated by the Financial Services Authority. This e-mail message is confidential and for use by the addressee only. 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