June 2007 - Boost-users - lists.preview.boost.org

[program options] & also an apology to the list...
by jono 10 Jun '07

10 Jun '07

...for my earlier grumpy email about program_options. i'm was wanting to pass some sequences to some options using boost::program_options. something like: [me@here ~]$program --opt1 1 2 3 4 --opt2 5 6 7 8 --opt3 xxx yyy zzz if i use desc.add_options("opt1", value< vector<string> >()->multitoken(), "...") i get all the tokens to the end of the line. can i make multitoken() stop eating tokens by recognizing a syntactic element; either an option specifier or a token it can't interpret as a required type? can i inherit from the value_semantic class to read multiple tokens maybe? this whole library is very interesting but subtle. i do better when i can read examples of working code. does anyone know a more extensive discussion of it besides the distibution docs? ...which are great by the way! cheers jono

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Problem with boost::program_options
by Jonas Bösch 10 Jun '07

10 Jun '07

Hi, I'm having a problem with boost::program_options. I attached a stripped-down version of the code that demonstrates the problem. I have a number of positional arguments ( "ops" ), and one normal argument ( "input-file,i" ). Now, if i run the program ./op_test pos0 pos1 pos2 -i non_positional it interpretes the "non_positional" as further positional arg, and not as parameter belonging to -i. Any hints on how to solve this are greatly appreciated. I ran it on: Mac OS X 10.4 on a G5, with the latest XCode ( gcc 4.0.1 ) boost 1.34 Jonas

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BGL: INTERNAL COMPILER ERROR in VC7.1
by Yariv Tal 10 Jun '07

10 Jun '07

This one was already posted by Nicholas Burlett awhile back (see http://lists.boost.org/MailArchives/boost-users/msg06534.php) but I have some new info that may help. The problem: ========= When compiling code that uses the boost.graph library the VC7.1 compiler shouts: c:\boost_1_32_0\boost\mpl\aux_\preprocessed\plain\apply_wrap.hpp(48) : fatal error C1001: INTERNAL COMPILER ERROR As Nicholas already noted, this seems to be due to some compiler problem with the boost.graph out_edge_iterators since it is caused by the following lines in my code: (FilteredGraphGenerator::FilteredGraph is a typedef of a boost::filtered_graph) typedef boost::graph_traits<FilteredGraphGenerator::FilteredGraph> ::out_edge_iterator oedge_iterator; oedge_iterator edgesItr, edgesEnd; boost::tie(edgesItr, edgesEnd) = boost::out_edges(itr->first, m_g.m_filteredGraph); while (edgesItr != edgesEnd) { // do anything! } In fact, it seems to be related to the operator!= between iterators (if the while loop is commented out it compiles). How ever, the error persists even after changing the operator!= to operator== : while (edgesItr == edgesEnd) { // do anything! } ========================================================================== Some findings: =========== * We used to use boost_1_30_0 and the code used to compile PERFECTLY. The problem only appeared after migrating to boost_1_32_0. * Calling directly to the "equal" function in iterator_core_access instead of the operator== works. typedef boost::graph_traits<FilteredGraphGenerator::FilteredGraph> ::out_edge_iterator oedge_iterator; oedge_iterator edgesItr, edgesEnd; boost::tie(edgesItr, edgesEnd) = boost::out_edges(itr->first,m_g.m_filteredGraph); while (boost::iterator_core_access::equal(edgesItr, edgesEnd, boost::mpl::true_())) { // do somthing } * The error message location is at the mpl::apply_wrap2 function. Any relation to the mpl::apply2 function used for declaring the operator== in the BOOST_ITERATOR_FACADE_INTEROP_HEAD macro? Have these functions changed since v1.30.0?

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Problem with ProgramOptions
by Jonas Boesch 10 Jun '07

10 Jun '07

Hi, I'm having a problem with boost::program_options. I attached a stripped-down version of the code that demonstrates the problem. I have a number of positional arguments ( "ops" ), and one normal argument ( "input-file,i" ). Now, if i run the program ./op_test pos0 pos1 pos2 -i non_positional it interpretes the "non_positional" as further positional arg, and not as parameter belonging to -i. Any hints on how to solve this are greatly appreciated. My machine: Mac OS X 10.4 ppc ( G5 ) XCode 2.4.1 ( gcc 4.0.1 ) boost 1.34 Greetings, Jonas The code: // ------------------------ options.h ------------------- #ifndef __VMML__OPTIONS__H__ #define __VMML__OPTIONS__H__ #include <boost/program_options.hpp> #include<map> namespace vmml { namespace boost_po = ::boost::program_options; typedef ::boost::program_options::variables_map var_map; class options { public: options(); void setup( int argc, char* argv[] ); void get_operator_chain( std::vector< std::string >& op_chain ); protected: // generic options boost_po::options_description _generic_options; // op chain boost_po::options_description _all_options; std::map< std::string, boost_po::options_description* > _op_descs; // positional options boost_po::positional_options_description _positional_desc; boost_po::variables_map _options_map; std::vector< std::vector< std::string > > _op_cfgs_from_file; };//class options };//namespace vmml #endif // --------- options.cpp -------------------------------- #include "options.h" #include <iostream> #include <vector> #include <string> namespace vmml { options::options() : _generic_options( "Generic options" ) { _generic_options.add_options() ("input-file,i", "specify input file") ("ops,O", boost_po::value< std::vector< std::string > >()- >composing(), "specify operators " ) ; _positional_desc.add( "ops", -1 ); } void options::setup( int argc, char* argv[] ) { _all_options.add( _generic_options ); boost_po::store( boost_po::command_line_parser( argc, argv ) .options( _all_options ) .positional( _positional_desc ) //.allow_unregistered() .run(), _options_map ); boost_po::notify( _options_map ); } void options::get_operator_chain( std::vector< std::string >& op_chain ) { if ( _options_map.count("ops") ) { const std::vector< std::string >& ops = _options_map["ops"].as< std::vector< std::string > >(); op_chain = ops; } } }//namespace vmml int main( int argc, char** argv ) { vmml::options opt; opt.setup( argc, argv ); std::vector< std::string > ops; opt.get_operator_chain( ops ); std::vector< std::string >::iterator it = ops.begin(); std::vector< std::string >::iterator itend = ops.end(); for( ; it != itend; ++it ) { std::cout << *it << std::endl; } }

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[boost.python] is it possible to make python::dict wrap an existing python dictionary object instead of making a copy?
by Marcin Kalicinski 10 Jun '07

10 Jun '07

python::dict m_mainNamespace = python::dict(m_mainModule.attr("__dict__")); The above code makes a copy of mainModule dictionary. Is it possible to make m_mainNamespace not a copy but a reference to mainModule dictionary? Marcin

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Failing with "Getting Started on Windows" program
by Robert Murphy 10 Jun '07

10 Jun '07

Hello, Following instructions on the "Getting Started on Windows" page, I installed boost using the BoostPro 1.34.0 Installer on XP Pro. I included the Boost.Regex binaries as directed, too. I'm running VS C++ 2005 Express. SDK is not installed. All directories are linked to as instructed to do so in the properties window. I tried building the 2nd program: e-mail checker one. However I get "LINK : fatal error LNK1104: cannot open file 'user32.lib'" as an error. 'user32.lib' is in the SDK My questions are: 1. Must I have the SDK installed to use boost for general unit testing of code I personally generate? 2. Do I have to have the SDK installed for the above program to run? Thank you. _________________________________________________________________ Dont miss your chance to WIN $10,000 and other great prizes from Microsoft Office Live http://clk.atdmt.com/MRT/go/aub0540003042mrt/direct/01/

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posting
by Jan Stetka 10 Jun '07

10 Jun '07

There is a spam issue. Each time I post to the list I get a reply: Delivered-To: jan.stetka(a)gmail.com Received: by 10.143.43.6 with SMTP id v6cs257677wfj; Sat, 9 Jun 2007 12:47:33 -0700 (PDT) Received: by 10.35.8.1 with SMTP id l1mr6177223pyi.1181418453286; Sat, 09 Jun 2007 12:47:33 -0700 (PDT) Received-SPF: fail X-Gmail-Fetch-Info: 485309469254 1 pop.tiscali.co.uk 110 janpstetka(a)tiscali.co.uk Return-Path: <postmaster(a)sina.com> Received: from r3-111.sinamail.sina.com.cn (202.108.3.111) by mail-11.uk.tiscali.com (7.3.110.8) id 4669D52F00718B6F for janpstetka(a)tiscali.co.uk; Sat, 9 Jun 2007 20:52:04 +0200 Received: (qmail 18402 invoked by uid 99); 9 Jun 2007 18:51:56 -0000 Date: 9 Jun 2007 18:51:56 -0000 Message-ID: <20070609185156.18401.qmail(a)mail3-111.sinamail.sina.com.cn> From: <postmaster(a)sina.com> To: <janpstetka(a)tiscali.co.uk> Subject: =?gbk?B?Ym9vc3QtdXNlcnNAc2luYS5jb221xNfUtq+72Li0?= MIME_version: 1.0 Content-type: text/plain; charset=gbk; format=flowed Content-transfer-encoding: 8BIT Your message received. Thank you. -- =================================================================== ע��2G��䣨 http://mail.sina.com.cn/chooseMode.html ��

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interprocess
by Jan Stetka 09 Jun '07

09 Jun '07

Hi, Interprocess still has not been included in the documentation on the main site yet, wouldn't it be good to include it there as soon as possible as it would increase the usage of interprocess. The "quick guide for the impatient" on maps is very good and a welcome addition to the documentation. The documentation at http://ice.prohosting.com/newfunk/ boost/libs/interprocess/doc/html/interprocess/quick_guide.html #interprocess.quick_guide.qg_interprocess_map reads "Boost.Interprocess's map is The construction of map is a bit tricky, because" which could be an editing or typing mistake as it doesn't currently make much sense. Thanks

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Non-trivial examples of Boost::Interprocess library usage
by Evan Torrie 09 Jun '07

09 Jun '07

Hi I'm new to Boost, and also new to Boost::Interprocess. I've been reading through the documentation for Boost::Interprocess, and have successfully written an application which creates a tree like structure in a managed_memory_mapped_file; saves it to disk, and then other processes can reopen that mmap'ed file and traverse the tree. However, I feel like I really am not making the best use of the library, and would like to get more experience by reading other example code from significant applications Does anyone have source code of a non-trivial application that exercises shared memory or memory-mapped files, storing objects with pointers to other objects (and strings) into the shared memory, deleting, updating, retrieving them etc. Specifically, say I'm trying to port an existing heap-based structure into shared memory. struct foo { int x, y; std::vector< std::string > keys; struct foo* left, right; } struct foo* root; What would this translate to in the boost::interprocess world? Is it possible to write templatized versions of these data structures that would work either with the existing std::allocator heap-based memory or with boost::interprocess stateful allocators without needing to create two versions of this data structure? One problem I've encountered is that default constructors for boost::interprocess::vector/string etc are not possible since they need to be constructed with a stateful allocator... so, does this mean that any constructor for object foo requires an allocator to be passed in which is then used in the initializer list to initialize these member containers? Sorry if this doesn't make sense - but any help would be appreciated. Thanks Evan. ----------------------------------------- E> evan.torrie(a)yahoo.com

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Does Boost include SHA-1 implementation?
by Bo Xie 09 Jun '07

09 Jun '07

I know I can call openSSL(or its libcrypto) for SHA-1. But how about Windows? (I can not redistribute openSSL windows version.) My question is: Does Boost include SHA-1 implementation? Thanks! -Bo

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boostcon slides online
by Ares Lagae 08 Jun '07

08 Jun '07

One of the previous posts in this list made me wondering. Wouldn't it be nice to have the slides from the boostcon talks online? Best regards, -- Ares Lagae Computer Graphics Research Group, Katholieke Universiteit Leuven http://www.cs.kuleuven.be/~ares/

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[integer] Request: long long (64 bits) support for int_t and uint_t
by Niels Dekker - mail address until 2007-11-30 08 Jun '07

08 Jun '07

I would like to have "long long" and "unsigned long long" supported by boost::int_t and boost::uint_t. E.g., on Win32, VC++, I would expect int_t<64>::least to get me a long long. Are there plans to add this kind of support? Otherwise, should I submit my request as a ticket to svn.boost.org/trac/boost ? It looks like "long long" support can be added quite easily, as I already did so on my local copy of boost/integer.hpp. -- Niels Dekker http://www.xs4all.nl/~nd/dekkerware Scientific programmer at LKEB, Leiden University Medical Center

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boost::bind as composite
by Boris 08 Jun '07

08 Jun '07

Hi, I have two predicates f1 and f2 and I want to construct the predicate f4 = f1 && f2 using boost::bind. Unfortunately I observe a strange behaviour of boost::bind I can not explain. struct Test { int a; int b; }; Test t = { 1, 2 }; typedef boost::function< bool (Test const&) > Fn; Fn f1 = bind( &Test::a, _1 ) == 1; assert (f1( t )); // Ok Fn f2 = bind( &Test::b, _1 ) == 3; assert (!f2( t )); // ok Fn f3 = bind( std::logical_and< bool >(), bind( &Test::a, _1 ) == 1, bind( &Test::b, _1 ) == 3 ); assert (!f3( t )); // Ok Fn f4 = bind( std::logical_and< bool >(), f1, f2 ); assert (!f4( t )); // assertion failed Why does the predicate f4 behave different from f3? Thanks, Boris

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[parameter] A few usage questions
by John Maddock 08 Jun '07

08 Jun '07

I have a few usage questions for the Boost.Parameter library: 1) If I want to have a function called "policy" that's declared using BOOST_PARAMETER_FUNCTION can I access the types of the arguments both from within the functions body and for the functions return type: BOOST_PARAMETER_FUNCTION( (return-type-computed-from-arguments), policy, tag, // 3. namespace of tag types (optional // optional parameters, with defaults (domain_error, *, throw_on_error) ) (deduced (optional (precision, *, boost::mpl::int_<53>()) ) ) ) { // what type are the arguments? } I realise I can do this with an argument pack, but then either my users will have to call the function with an extra set of parenthesis, or I will have to write a bunch of forwarding functions myself - which itself generates a "what the is the return type" problem. >From within the body of the BOOST_PARAMETER_FUNCTION generated function it appears that I can use the name "Args" to refer to the type of the argument pack, and maybe in the return type as well? But this isn't documented, so can I rely on it? 2) All the arguments I want to pass are actually going to end up being used in meta-programs: for symbolic values, I can make each one a unique enum type, and use the type of the argument (even though it's actually passed as a value) to generate my metacode. But I have one optional argument where I require the value to be an arbitrary compile time constant, the only interface I can come up with at present is something like: policy(_digits10 = mpl::int_<10>()); But I'd really like to be able to write: policy(_digits10 = 12); and have the "12" converted to mpl::int_<12> "by magic", but I can't think of any magic that could be applied here... anyone any ideas? Thanks, John.

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[boost::variant] does 'incomplete<T>' still exist?
by jono 08 Jun '07

08 Jun '07

hi. i read a tutorial at http://electra.lbl.gov/stuff/variant/doc/tutorial.html which says a boost::variant type can be declared with an incomplete type in its typelist by using incomplete<T>. i'm using boost 1.33.1 & i can't find incomplete<T> anywhere. does it still exist? the tutorial is dated '14 February 2003'. can variants use incomplete types? i want to have a variant represent a type which has a variant member. can i do that? i'm working on a kind of envelope/letter idiom for dispatching operations on values. cheers jono

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Re: [Boost-users] port of GameDev SDL lib in Boost?
by Christian Henning 08 Jun '07

08 Jun '07

Hi there, I think there is something wrong with the timer. Whenever I run the code ( see below ) it slows down for whatever reason. Is that a known problem? When I look at the output the frequency is certainly not 10 times a second. #include <windows.h> #include <iostream> #include <sdl.h> using namespace std; Uint32 time_elapsed( Uint32 interval, void* param ) { cout << interval << endl; return ++interval; } int main( int argc, char* argv[] ) { SDL_Init( SDL_INIT_VIDEO | SDL_INIT_TIMER ); SDL_TimerID id = SDL_AddTimer( 100, &time_elapsed, NULL ); SDL_Event event; while( SDL_PollEvent( &event ) >= 0 ) { ::Sleep( 100 ); } return 0; }

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[signal] Invoking connect with same argument a second time allowed?
by Boris 08 Jun '07

08 Jun '07

Is it allowed to call connect() with the same argument (slot) a second time (without disconnecting in between)? I've been checking the documentation at http://www.boost.org/doc/html/boost/signalN.html#id1033842-bb but couldn't find any answer. I assume it is allowed (it doesn't throw any exception et al.) but don't want to build a software based on assumptions really. ;-) Boris

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wave: preprocessing Visual C++ 2005 stl
by Ludovic Aubert 07 Jun '07

07 Jun '07

Hello boost wave users, I have written a sample program which uses boost wave and I am trying to run it on its own source code. The environnement (especially the stl) is Microsoft Visual C++ 2005. Since typically an include file like "vector" will be preprocessed many times (once for every compilation unit), I am saving all the preprocessed tokens in a map<string, map<tuple<int,int>,string> > token, so that token[path][make_tuple(line,col)] = value. Then for each path I am using a forward iterator to spit out all the values into a buffer. The major trouble I have is with the macros #define STD_BEGIN namespace std { #define STD_END } defined in the file "yvals.h" Somehow, STD_BEGIN and STD_END are replaced by blanks and I get "namespace std{}" at the end of the files instead. Looks like the line and col for these items are wrong ... I would like to know if someone has already successfully preprocessed the stl delivered with Visual C++ 2005. Thank you in advance for your reply Ludovic Aubert

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Filesystem Exception
by Surya Kiran Gullapalli 07 Jun '07

07 Jun '07

Hello all, I'm creating a directory using boost::filesystem::create_directory function. When i looked at the documentation, It said, Throws: basic_filesystem_error<Path> if Effects fails for any reason other than because the directory already exists. Now when i catch the exception like this try { boost::filesystem::create_directory (path) } catch (boost::filesystem::basic_filesystem_error <boost::filesystem::path>& e) { cout << e.what() << endl ; } e.what() returns the string boost::filesystem::create_directory. What i expect is why the create_directory failed. How can i get the string describing the problem. Thanks in advance, Surya

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Re: [Boost-users] port of GameDev SDL lib in Boost?
by Christian Henning 07 Jun '07

07 Jun '07

My current version is more or less ready to use. you can check it here: http://gil-contributions.googlecode.com/svn/trunk/gil_2/boost/gil/extension… Let me know what you think. I'm not so sure if you can put your callback timer under the boost license. Maybe somebody else knows the answer. Christian On 6/6/07, fanzhe cui <fanzhe.cui(a)goldiom.com> wrote: > Christian, > > Boost is very widely accepted and utilized by game developers, and on the > web GameDev.net there are many many articles about various boost sub lib. > But I haven't seen many discussions about SDL lib on this boost mail list > from boost users/developers. SDL is very convenient cross-platform C++ > development platform that can be used not only game developers but also by > other developers. It has easy-to-use classes of multithreads, mutex, event > queues, timer callbacks, semaphores, key board input handling, audio, video, > to name a few. Most of these functionalities are available from Boost lib. > But I haven't seen good timer callback available from Boost lib (anybody can > correct me if I am not so informed of Boost timer). > > I tried to extract the timer functions (classes) from the SDL lib into an > individual timer lib, and the work is still in progress. I am not sure other > users in the list are interested in knowing about porting SDL timer to > Boost. So if you can tell me your email of this email list, I can send you > the project file. > > What exactly I did was that I included the relevant source files from SDL > package, and compile it with testing program. I was able to get the exe file > but the project also generated a library file in addition to the exe file. I > am confused by the fact that the project generating TimerTest.lib, that I > don't want t. Rather, I wanted to link them with TimerTest not intended to. > I checked the project configuration file, and there is no setting that will > generate a library file. I think it might be set in the program source code, > but I did not find it. > > I am interested in your idea of implement SDL wrapper in boost lib. Thank > you! > > Best regards, > Fanzhe Cui > +++++++++++++++++++++++++++ > Goldiom Systems LLC > - Information and Communication Technology Provider > Email: fanzhe.cui(a)goldiom.com > Tel: 973-210-4254 > www.goldiom.com > > > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Christian Henning > Sent: Wednesday, June 06, 2007 10:06 AM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] port of GameDev SDL lib in Boost? > > Fanzhe, I have been working on a sdl wrapper for boost::gil. It lets > you draw on a canvas and react to event such as a timer event. I was > thinking of outsourcing this portion so people can use just that. The > good thing is the sdl is supporting almost the same platforms as boost > does. The bad thing probably is the license sdl is using, LGPL. > > If you want I can give you a pointer for the code. > > Christian > > On 6/6/07, fanzhe cui <fanzhe.cui(a)goldiom.com> wrote: > > Yes, I was referring to that library and more info could be found from the > > web: http://www.libsdl.org/. > > The problem with the boost timer that you mentioned is that it provides > the > > time elapsed, but not the interface like provided by SDL lib. Particularly > > the kind of timer callback function that is available in SDL lib is not > > available in Boost lit. > > > > Best regards, > > Fanzhe Cui > > > > ++++++++++++++++++++++ > > Goldiom Systems LLC > > - Information and Communication Technology Provider > > Email: fanzhe.cui(a)goldiom.com > > Tel: 973-210-4254 > > www.goldiom.com > > > > -----Original Message----- > > From: boost-users-bounces(a)lists.boost.org > > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Tarjei Knapstad > > Sent: Wednesday, June 06, 2007 4:02 AM > > To: boost-users(a)lists.boost.org > > Subject: Re: [Boost-users] port of GameDev SDL lib in Boost? > > > > On 6/6/07, fanzhe cui <fanzhe.cui(a)goldiom.com> wrote: > > > I have been using both Boost lib and GameDev SDL lib in same projects. > > Both > > > of the lib have very good platform independency. But they have some > > > functionalities overlapping each other and I would like to use only one > of > > > them. The timer lib in GameDev SDL is very easy to use and I hope such > lib > > > or functionally similar one exists in Boost lib. I had a look at boost > > > archive on previous discussion on implementing Boost timers and feel > that > > > there is still no good implementation of timer in Boost lib (correct me > if > > I > > > am wrong). Anybody in this email list had a look at GameDev timer and > have > > > considered implementing such a lib in Boost? > > > > > > > Are you referring to the Simple Direct Medialayer? > > > > http://lazyfoo.net/SDL_tutorials/lesson12/index.php > > > > What's wrong with/missing in boost::timer ? > > > > http://boost.org/libs/timer/index.html > > > > -- > > Tarjei > > _______________________________________________ > > Boost-users mailing list > > Boost-users(a)lists.boost.org > > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > > > > > > _______________________________________________ > > Boost-users mailing list > > Boost-users(a)lists.boost.org > > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > > _______________________________________________ > 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] port of GameDev SDL lib in Boost?
by Christian Henning 07 Jun '07

07 Jun '07

Fanzhe, I have been working on a sdl wrapper for boost::gil. It lets you draw on a canvas and react to event such as a timer event. I was thinking of outsourcing this portion so people can use just that. The good thing is the sdl is supporting almost the same platforms as boost does. The bad thing probably is the license sdl is using, LGPL. If you want I can give you a pointer for the code. Christian On 6/6/07, fanzhe cui <fanzhe.cui(a)goldiom.com> wrote: > Yes, I was referring to that library and more info could be found from the > web: http://www.libsdl.org/. > The problem with the boost timer that you mentioned is that it provides the > time elapsed, but not the interface like provided by SDL lib. Particularly > the kind of timer callback function that is available in SDL lib is not > available in Boost lit. > > Best regards, > Fanzhe Cui > > ++++++++++++++++++++++ > Goldiom Systems LLC > - Information and Communication Technology Provider > Email: fanzhe.cui(a)goldiom.com > Tel: 973-210-4254 > www.goldiom.com > > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Tarjei Knapstad > Sent: Wednesday, June 06, 2007 4:02 AM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] port of GameDev SDL lib in Boost? > > On 6/6/07, fanzhe cui <fanzhe.cui(a)goldiom.com> wrote: > > I have been using both Boost lib and GameDev SDL lib in same projects. > Both > > of the lib have very good platform independency. But they have some > > functionalities overlapping each other and I would like to use only one of > > them. The timer lib in GameDev SDL is very easy to use and I hope such lib > > or functionally similar one exists in Boost lib. I had a look at boost > > archive on previous discussion on implementing Boost timers and feel that > > there is still no good implementation of timer in Boost lib (correct me if > I > > am wrong). Anybody in this email list had a look at GameDev timer and have > > considered implementing such a lib in Boost? > > > > Are you referring to the Simple Direct Medialayer? > > http://lazyfoo.net/SDL_tutorials/lesson12/index.php > > What's wrong with/missing in boost::timer ? > > http://boost.org/libs/timer/index.html > > -- > Tarjei > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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Uninitialized value p$m_value
by Paul 07 Jun '07

07 Jun '07

Hi, I'm trying to learn how to use the Boost Graph Library. Here is a very simple code example. #include <boost/graph/adjacency_list.hpp> #include <string> int main( void ) { using namespace std; using namespace boost; typedef adjacency_list< listS, vecS, directedS, // Vertex properties property< vertex_name_t, std::string >, // Edge properties property< edge_weight_t, int > > Graph; Graph graph; // Graph traits used to access graph's iterator types graph_traits< Graph >::vertex_descriptor a, b; a = add_vertex( graph ); b = add_vertex( graph ); graph_traits< Graph >::edge_descriptor ed; bool inserted; tie( ed, inserted ) = add_edge( a, b, graph ); // LINE 26 return 0; } When I compile this with g++ v4, I get on my Debian Etch system the warning for line 26: /usr/include/boost/graph/detail/adjacency_list.hpp:263: warning: 'p$m_value' is used uninitialized in this function Line 263 in adjacency_list.hpp looks as follows: inline stored_edge_property(Vertex target, const Property& p = Property()) : stored_edge<Vertex>(target), m_property(new Property(p)) { } What am I doing wrong and how can I fix that? Thank you. Regards, Paul

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[filesystem] remove for directories
by Ovanes Markarian 07 Jun '07

07 Jun '07

Hello all! Is there any way to remove a directory using boost::filesystem? remove and remove_all throw an exception. Remove docs reference a POSIX remove(). There is written: [quote] If path does not name a directory, remove(path) shall be equivalent to unlink(path). If path names a directory, remove(path) shall be equivalent to rmdir(path). [/quote] Unfortunately remove does not behave so (on WinXP and Visual C++ 8). One more issue: the link to the POSIX remove() doc points to link() and not remove. With Kind Regards, Ovanes

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Signal not disconnecting?
by Christian Mol 07 Jun '07

07 Jun '07

Hi, I'm using the signal library in my application. However if I call disconnect() on my connection object the connection is not removed. Is this default behaviour? I would like not having this behaviour because the signal is connected to a member function within an object that is actually deleted. Any ideas? Regards, Christian

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BGL compile error
by gast128 07 Jun '07

07 Jun '07

Dear all, We want to (DLL) export a boost graph. Probably on (DLL) exporting, the compiler tries to generate code for every member function. However on VC++7.1 it gives then a problem with operator[]. This can be easily verified with the following case: void Foo() { boost::adjacency_list<> graph; graph[0]; } We use here Boost 1.33.0. Anyone an idea? Wkr, me

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