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

[boost::mpl][boost::variant]
by Naveen Santhanam 05 Mar '09

05 Mar '09

Hello, I can't get the attached example to compile, using MS VC 8.0 and boost_1_35_0, when I uncomment the comment lines in the code. Can some one help me in finding what's wrong? A brief description: The code contains a class that has a variant as a member and a visitor that creates types of the variant. Thanks in advance

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Boost thread priority
by Andrei VANCEA 05 Mar '09

05 Mar '09

Hello! I want to set the priority of a boost thread. It seems that this feature is not (yet) implemented and the only option is to go to lower level (pthread in my case). The documentation says that the method native_handle() should return the handler of the associated pthread. The problem is that this method no longer exists (for the pthread implemention; it is there for the win32 version). Anyone knows how to get the pthread handler of a boost thread (I'm using the 1.35 vesion) -- Andrei Vancea

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Re: [Boost-users] [auto_link] Using MSVC 2005 (VC8)
by dhruva 05 Mar '09

05 Mar '09

Apologize for the false alarm, I was using CMake generated files to build. After making cnahes in the CMake file, I had missed regenerating the MSVC build files... Everything's fine and it works at it always does :) -dhruva ----- Original Message ---- > From: dhruva <dhruva(a)ymail.com> > To: BOOST users <boost-users(a)lists.boost.org> > Sent: Thursday, 5 March, 2009 12:04:41 PM > Subject: [auto_link] Using MSVC 2005 (VC8) > > Hi, > I have built boost 1.38 using MSVC 2005 using "--layout=system link=static". > That has resulted in libraries with the following name convention. > > libboost_system-mt.lib > libboost_date_time-mt.lib > > Auto link triggers in even if I define BOOST_ALL_NO_LIB. I searched through the > all of BOOST headers in my install folder for BOOST_ALL_NO_LIB and found it only > in a comment in boost/config/user.hpp > > Would that define really disable auto-link? > > -dhruva > > > > Check out the all-new Messenger 9.0! Go to http://in.messenger.yahoo.com/ Check out the all-new Messenger 9.0! Go to http://in.messenger.yahoo.com/

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[auto_link] Using MSVC 2005 (VC8)
by dhruva 05 Mar '09

05 Mar '09

Hi, I have built boost 1.38 using MSVC 2005 using "--layout=system link=static". That has resulted in libraries with the following name convention. libboost_system-mt.lib libboost_date_time-mt.lib Auto link triggers in even if I define BOOST_ALL_NO_LIB. I searched through the all of BOOST headers in my install folder for BOOST_ALL_NO_LIB and found it only in a comment in boost/config/user.hpp Would that define really disable auto-link? -dhruva Check out the all-new Messenger 9.0! Go to http://in.messenger.yahoo.com/

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BoostCon '09 Sessions
by David Abrahams 05 Mar '09

05 Mar '09

Hartmut Kaiser and the BoostCon Program committee have done a stellar job assembling a list of sessions for this year's BoostCon, including everything from C++ compiler developer presentations, to hands-on C++0x development, to talks on eexperimental metaprogramming enhancements, to expression templates for running code on GPUs. I can honestly say I want to go to almost every session. It's going to be hard to choose. Please see the session list at: http://www.boostcon.com/program/sessions and then, of course, head on over to http://www.boostcon.com/registration to register for the conference. Best regards to all. See you there! -- Dave Abrahams BoostPro Computing http://www.boostpro.com

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[iostreams] with compression filters?
by Mikko Vainio 05 Mar '09

05 Mar '09

Dear boosters, I'm trying to compile IOStreams from 1.38.0 with bzip2 compression enabled on windows. The docs say "you will need to set variables indicating the location of the source files". Setting boost.build variables in user-config.jam doesn't seem to do the trick. Providing "-s|BZIP2_SOURCE|=..." or any of the other related variables or combinations thereof on the command line for bjam does not help. Does anyone out there have an example on how to do this exactly? I suggest such an example to be added to the documentation. Or is this a bug in the build system? Regards, Mikko

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bind member function of a member of a class...
by Archie14 05 Mar '09

05 Mar '09

I cannot figure out how to use boost::bind in following scenario: class A { int i_; public: int test() {return i;} }; class B { A _a; public: A& getA() {return _a;} } bool testbind() { B b; // here I am trying to find out if b.getA().test() equals 1 // I understand that B::getA::test is incorrect, and that's my question- // how to use bind here? return (boost::bind (&B::getA::test, b) ==1); }

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Re: [Boost-users] Boost-users Digest, Vol 1924, Issue 10
by Rob Currey 04 Mar '09

04 Mar '09

> From: "Peter Dimov" <pdimov(a)pdimov.com> > Subject: Re: [Boost-users] [enable_shared_from_this] My derivation > ofenable_shared_from_this wants to be templated >> template<class X> >> class Y: public enable_shared_from_this< Y<X> > >> { >> public: >> >> shared_ptr< Y<X> > f() >> { >> return shared_from_this(); > > In a template, you need > > return this->shared_from_this(); > > to inform the compiler that shared_from_this will come from a base class. > >> } perfect ... thank you.

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Calling date_time time_input_facet directly
by Jeffery Cavallaro 04 Mar '09

04 Mar '09

I have to parse a leading timestamp in a bunch of records, and I would like to avoid having to copy each record into a stringstream just to parser the timestamp. Does anyone know how to call the date_time time_input_facet directly? I did something like the following: char buffer[N]; typedef boost::date_time::time_input_facet<boost::posix_time::ptime, char, char *> TimeFacet; TimeFacet *f = new TimeFacet; boost::posix_time::ptime t; f->get(buffer, buffer + size, ???, t); But I don't know what to pass for the 3rd arg, which is an ios_base &. I tried an ios instance and a stringstream instance, but I couldn't get anything to work - the compiler can't seem to match the call. -- Jeffery Cavallaro, MTV-45-208G Infrastructure Engineering Google Inc. 1600 Amphitheatre Parkway Mountain View, CA 94043 650-214-2552

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VS 2008 Link1104 Error
by Mantas Matelis 04 Mar '09

04 Mar '09

Hello everyone, I've just built the boost libraries and I'm trying to get visual studio 2008 to properly recognize the libraries. The library that the linker is looking for is in C:\development\boost\build\boost\bin.v2\libs\filesystem\build\msvc-9.0\debug\link-static\threading-multi\libboost_filesystem-vc90-mt-gd-1_38.lib Even though I've added C:\development\boost\build\boost\bin.v2\libs to the extra libraries vc++ global setting. Error Message: 1>LINK : fatal error LNK1104: cannot open file 'libboost_filesystem-vc90-mt-gd-1_38.lib' If I add C:\development\boost\build\boost\bin.v2\libs\filesystem\build\msvc-9.0\debug\link-static\threading-multi to the project extra library setting though, the program compiles and links properly. On MSDN, http://msdn.microsoft.com/en-us/library/ts7eyw4s.aspx I've seen nothing that I think applies to me. So, what do I do?

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