February 2010 - Boost-users - lists.preview.boost.org

convert from string to int
by pedro chaparro 11 Feb '10

11 Feb '10

hi, what is the sintax of the command to do a conversion from string to int? thanks -- Ing Pedro Alonso Chaparro Valero Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain

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Re: [Boost-users] [bhoost-build] error: Unable to find file or target named '/qt//QtGui'.
by Tim Odenthal 11 Feb '10

11 Feb '10

On Thursday 11 February 2010 17:18:08 boost-users-request(a)lists.boost.org wrote: > Hi! > > After successfully compiling our project dozens of times, I suddenly get > the error: Unable to find file or target named '/qt//QtGui'. > > I have absolutely no clue to what I could possibly have changed; I reverted > our whole jamtree to the date before the last successful compilation... Hmm I seem to have accidentally changed either user- or site-config file: if I add import qt ; using qt : /usr/share/qt4 ; to my user-config.jam, it all works again... Sorry... Tim -- Dipl.-Phys. Tim Odenthal Afdeling Mechatronica, Biostatistiek en Sensoren, Departement Biosystemen Faculteit Bio-ingenieurswetenschappen K.U. Leuven Belgium Mailing address: Afd. MeBioS, Kasteelpark Arenberg 30 B-3001 Heverlee Belgium Phone: +32 (0) 16 328595 Mobile: +32 (0) 474 32 42 38 Email: Tim.Odenthal(a)biw.kuleuven.be

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Move semantics
by Andy Venikov 11 Feb '10

11 Feb '10

Does boost provide any tools that help generate move-semantics classes? I've seen several references to boost:move(), but are there generic base classes that could be inherited from (or some other means) that could help me in automatically generating move-semantics classes. Something similar to MOJO? Thanks, Andy.

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[Boost] Is this library availble for 64 bit?
by Jaiswal, Usha [OS-IE] 11 Feb '10

11 Feb '10

Is there any version of Boost for 64 bit.

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Re: [Boost-users] [CMake] FindBoost: Boost_ADDITIONAL_VERSIONS : what to do for trunk
by Hicham Mouline 11 Feb '10

11 Feb '10

> -----Original Message----- > Subject: [CMake] FindBoost: Boost_ADDITIONAL_VERSIONS : what to do for trunk > Hi, > I use the trunk checkout of boost as well as released versions. > I have it installed under \Program Files > - boost-trunk > - boost_1_41_0 > Is there any support at all for a non-number version? > I want to find the include directory and some of the libraries as well, > rds, Hello, Is FindBoost Boost_ADDITIONAL_VERSIONS able to handle boost trunk? Regards,

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wrapping callback fonction from fltk2
by fayssal smawi 11 Feb '10

11 Feb '10

I'm a basic user of boost::python, I have just start with it this month and I look into wrapping FLTK2, I have wrapped the basics Widgets and they work great, except for collabck fonctions. I have find an old message in this mailng list refering to the same poblem with fltk but honestly I didn't understand. http://lists.boost.org/Archives/boost/2001/04/10820.php if someone can help me with an exemple I will be grateful plz I need help

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file_mapping and network failure problem
by Marko Pietarinen 11 Feb '10

11 Feb '10

Hi, I use boost::interprocess::file_mapping to map certain data files (data files are on server). Then I use boost::interprocess::mapped_region with that file-map to access the data. The following is pseudo code: // file-map is initialized first file_mapping fileMap(filename); mapped_region mappedRegion(fileMap); // later some where else data is read from file float * ptr = reinterpret_cast<float *>(mappedRegion.get_address()); float value = ptr[index]; This works normally fine. But sometimes you map data file when network is ok After that you need to look some data (in portion that is not on memory allready) when the network is not in use, then program just crashes. This is pretty logical to me. But the question is, can I some how detect the problem and prevent the crash. I tried to catch exception but no help there. And is this the rigth way to use mapped files? Marko

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BOOST_SCOPE_EXIT doesn't detect argument types
by Braden McDaniel 11 Feb '10

11 Feb '10

I have the following code: typedef std::vector<boost::intrusive_ptr<node> > children_t; children_t children = group.children_.value(); ⋮ children.push_back(*n); bool succeeded = false; BOOST_SCOPE_EXIT((&succeeded)(&children)) { if (!succeeded) { children.pop_back(); } } BOOST_SCOPE_EXIT_END This is yielding compiler errors like this: 193: error: ‘boost_se_params_t_193::boost_se_param_t_0_193’ is not a type 193: error: ‘boost_se_params_t_193::boost_se_param_t_1_193’ is not a type The block of code emitted by the preprocessor starts like this: typedef void (*boost_se_tag_0_193)(int &succeeded); typedef void (*boost_se_tag_1_193)(int &children); … which leads me to conclude that, for some reason, BOOST_SCOPE_EXIT isn't picking up the correct types for its arguments. Has anyone seen this sort of thing before? Is there something I can do to play more nicely with BOOST_SCOPE_EXIT? -- Braden McDaniel <braden(a)endoframe.com>

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[fusion] Use of FUSION_MAX_VECTOR_SIZE in headers
by Gabriel Redner 10 Feb '10

10 Feb '10

Hi all, I'm trying to use fusion vectors with more than 10 elements, but I'm running into some trouble. I'm using fusion as an implementation detail of some header-based tools, which get included (often indirectly) by some translation units. The tools require large fusion vectors, but I don't want client code (i.e. the .cpp files) to have to care about this. I was under the impression that I could just add: #define FUSION_MAX_VECTOR_SIZE 20 #include <boost/fusion/container.hpp> in my tool's header file, and be off to the races. It seems that this works only if no other fusion header has been included previously in the same translation unit: #include <boost/fusion/container.hpp> ... #define FUSION_MAX_VECTOR_SIZE 20 #include <boost/fusion/container.hpp> ... // Error - too many template arguments! boost::fusion::make_vector(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15); I really don't want to have to track down every translation unit which is (usually indirectly) including my tool's header. I am under the impression that boost::function is fine with client code redefining its limit macro and re-including its header, but perhaps fusion does not have the same feature? I also realize that for vector itself I can just include vectorN.hpp and use vectorN<...>, but if I want to use the generation functions (make_vector, vector_tie) it seems I'm stuck. Is there a workaround, or just something obvious that I'm doing wrong? Thanks, -Gabe

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[boost][graph] astar_search bug
by Andy Tompkins 10 Feb '10

10 Feb '10

Hi, I have been upgrading some projects to use boost version 1.42.0 with Visual Studio 2008 and found (I believe) a bug with astar_search. I have attached a minimal program that will reproduce the problem, and a patch file to correct it. I created a ticket (Ticket #3917) that has these files attached and attached them to this. Regards, Andy Tompkins

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