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

[boost.python] setting member function for creating python objects
by Olaf Peter 14 Aug '08

14 Aug '08

Hi, for my redirected output boost.python (bpl) program I like to set special writing functions at construction time. The idea is to use a boost.function for this, like (my won't work): static std::auto_ptr<stdout_redirector> make_stdout_redirector(EmbeddedPython& console) { std::auto_ptr<stdout_redirector> ptr(new stdout_redirector); *ptr.m_write_fn = boost.bind(EmbeddedPython::write, &console); return ptr; } or even: static std::auto_ptr<stdout_redirector> make_stdout_redirector(EmbeddedPython& console) { std::auto_ptr<stdout_redirector> ptr(new stdout_redirector(boost.bind(EmbeddedPython::write, &console))); return ptr; } using the constructor, which would be different for that what python would see (here comes my idea using bpl::make_constructor into play). So each time my redirector is called, EmbeddedPython::write can call the underlying (not seen here, std::cout used here for simplicity) write instance. The problem: I can not make those calls from boost.python's class_ , isn't it? Any ideas for this? I don't want to use global variables. Thanks, Olaf

1 0

[Serialization] BOOST_CLASS_EXPORT_GUID related compile errors on Boost 1.35 with Visual Studio 2005
by Paul Wais 14 Aug '08

14 Aug '08

Dear List, I am writing to request advice about a compile error possibly related to the BOOST_CLASS_EXPORT_GUID macro under Boost 1.35 and Visual Studio 2005. I unfortunately cannot share much about the cause of the error and was hoping to query the community to see if anybody else has had similar difficulties. In particular, it seems at least one other developer has had a similar problem, as described in the blog post: http://www.alexmccarthy.net/archives/2008/06/16/upgrading-to-boost-135 The problem in question involves a library we wrote that uses basic features of Boost Serialization for marshaling objects to XML. The library compiles and runs successfully on Linux (gcc version 4.2.3 Ubuntu 4.2.3-2ubuntu7). When compiling the same code on a properly-configured Windows machine using Visual Studio 2005, we observe the following compile errors: C:\Boost\include\boost-1_35\boost/serialization/type_info_implementation.hpp(48) : error C2027: use of undefined type 'boost::serialization::extended_type_info_impl<T>' with [ T=boost_time ] C:\Boost\include\boost-1_35\boost/serialization/export.hpp(75) : see reference to class template instantiation 'boost::serialization::type_info_implementation<T>' being compiled with [ T=boost_time ] .\ConstraintSystem/Time/boost_time.h(159) : see reference to class template instantiation 'boost::archive::detail::guid_initializer<T>' being compiled with [ T=boost_time ] C:\Boost\include\boost-1_35\boost/serialization/type_info_implementation.hpp(49) : error C2146: syntax error : missing ',' before identifier 'type' C:\Boost\include\boost-1_35\boost/serialization/type_info_implementation.hpp(49) : error C2065: 'type' : undeclared identifier C:\Boost\include\boost-1_35\boost/serialization/type_info_implementation.hpp(50) : error C3203: 'identity' : unspecialized class template can't be used as a template argument for template parameter 'F2', expected a real type C:\Boost\include\boost-1_35\boost/serialization/type_info_implementation.hpp(50) : error C2955: 'boost::mpl::identity' : use of class template requires template argument list C:\Boost\include\boost-1_35\boost/mpl/identity.hpp(26) : see declaration of 'boost::mpl::identity' . . . (dozens of similar errors follow) The owner of the aforementioned blog suggests to add the line: #include <boost/serialization/extended_type_info_typeid.hpp> to the file: boost/serialization/export.hpp. We have done that and our compile errors go away. Though this fix seems to work for our needs, we endeavor to keep the copy of our Boost library free from unofficial patches. Might anybody have similar troubles? Might there be an "official" fix to this problem? Thank you for your time and I greatly appreciate any help on this issue. Best Regards, -Paul Wais

2 1

[fusion] Why no multi{map,set} ?
by John C. Femiani 14 Aug '08

14 Aug '08

Hi, I was just wondering why fusion (and mpl) don't include multi-maps or multi-sets. Are they unnecessary at compile time? Are they too trivial? Do they conceptually not work? Thanks, John Femiani.

3 3

boost including problem
by szurilo 14 Aug '08

14 Aug '08

Dear all! I have a small library developed in c++ and i would like to invoke some boost function. I develop under Windows XP, Code::Blocks, MinGW 5.1.3 I would like to use some separately built part of boost, like thread and regex. I also built these libs with mingw. So i try to configure my IDE to prepare for boost. I set the compiler search path to C:\Program Files\boost\boost_1_33_1 Is it enough or should i link to thread and regex libs directly to my library? For example: C:\Program Files\boost\boost_1_33_1\bin\boost\libs\regex\build\libboost_regex.lib\gcc\debug\threading-multi\libboost_regex-gcc-mt-d-1_33_1.lib; Isn't it a problem for MinGW to find this lib with the white space character inside "Program Files"? Thanks, Szurilo -- View this message in context: http://www.nabble.com/boost-including-problem-tp18980213p18980213.html Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

[gil] More tiff problems
by John C. Femiani 14 Aug '08

14 Aug '08

I found a bug in GIL, and I think I have a patch for it. Basically the tiff reading code in GIL fails to handle alpha channels properly. Basically an RGBA tiff can be read into an RGB image, causing garbage. The source of the problem seems to be that TIFFTAG_PHOTOMETRIC is the only thing used to decide which pixel format to read. One should also read TIFFTAG_SAMPLESPERPIXEL to see if there are any extra fields, and TIFFTAG_EXTRASAMPLES to figure out what they mean. (I did not do all that in this little patch). On a related note: 1) Is GIL updating the boost/SVN repository? It seems to have been a long time (6 months) since the last change (removing tabs) 2) What is the status of the new_io library (Christian Henning was working on it I think). I think that this is the best hope for dealing with the IO issues I tend to have with GIL so far (it does not read RGBA jpegs either, it can not handle palettes, certain kinds of tiff compression, etc.) --John Index: png_io_private.hpp =================================================================== --- png_io_private.hpp (revision 48136) +++ png_io_private.hpp (working copy) @@ -291,6 +291,9 @@ default: io_error("png_reader_color_convert::apply(): unknown combination of color type and bit depth"); } break; + case PNG_COLOR_TYPE_PALETTE: + io_error("png_reader_color_convert::apply(): cannot read png images with a pallette (yet)"); + default: io_error("png_reader_color_convert::apply(): unknown color type"); } png_read_end(_png_ptr,NULL); Index: tiff_dynamic_io.hpp =================================================================== --- tiff_dynamic_io.hpp (revision 48136) +++ tiff_dynamic_io.hpp (working copy) @@ -56,13 +56,32 @@ class tiff_type_format_checker { int _bit_depth; int _color_type; + unsigned short _samples_per_pixel; public: - tiff_type_format_checker(int bit_depth_in,int color_type_in) : - _bit_depth(bit_depth_in),_color_type(color_type_in) {} + tiff_type_format_checker( int bit_depth_in + , int color_type_in + , unsigned short samples_per_pixel_in + ) + : _bit_depth(bit_depth_in) + , _color_type(color_type_in) + , _samples_per_pixel(samples_per_pixel_in) + {} template <typename Image> bool apply() { - return tiff_read_support<typename Image::view_t>::bit_depth==_bit_depth && - tiff_read_support<typename Image::view_t>::color_type==_color_type; + typedef tiff_read_support<typename Image::view_t> traits; + + int my_samples_per_pixel = size<typename Image::value_type>(); + + bool same_bit_depth = traits::bit_depth == _bit_depth; + bool same_color_type = traits::color_type == _color_type; + bool same_samples_per_pixel = my_samples_per_pixel == _samples_per_pixel; + + bool result = same_bit_depth && same_color_type; + + if (_samples_per_pixel) + result = result && same_samples_per_pixel; + + return result; } }; @@ -77,13 +96,17 @@ template <typename Images> void read_image(any_image<Images>& im) { - int width,height; - unsigned short bps,photometric; - TIFFGetField(_tp,TIFFTAG_IMAGEWIDTH,&width); - TIFFGetField(_tp,TIFFTAG_IMAGELENGTH,&height); - TIFFGetField(_tp,TIFFTAG_BITSPERSAMPLE,&bps); - TIFFGetField(_tp,TIFFTAG_PHOTOMETRIC,&photometric); - if (!construct_matched(im,tiff_type_format_checker(bps,photometric))) { + int width; + int height; + unsigned short bps=1; + unsigned short photometric = 1; + unsigned short samples_per_pixel = 0; + TIFFGetField(_tp, TIFFTAG_IMAGEWIDTH, &width); + TIFFGetField(_tp, TIFFTAG_IMAGELENGTH, &height); + TIFFGetField(_tp, TIFFTAG_BITSPERSAMPLE,&bps); + TIFFGetField(_tp, TIFFTAG_PHOTOMETRIC, &photometric); + TIFFGetField(_tp, TIFFTAG_SAMPLESPERPIXEL, &samples_per_pixel); + if (!construct_matched(im, tiff_type_format_checker(bps,photometric, samples_per_pixel))) { io_error("tiff_reader_dynamic::read_image(): no matching image type between those of the given any_image and that of the file"); } else { im.recreate(width,height); Index: tiff_io.hpp =================================================================== --- tiff_io.hpp (revision 48136) +++ tiff_io.hpp (working copy) @@ -1,6 +1,6 @@ /* Copyright 2005-2007 Adobe Systems Incorporated - + Use, modification and distribution are subject to the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) @@ -51,6 +51,12 @@ BOOST_STATIC_CONSTANT(int,color_type=PHOTOMETRIC_RGB); }; template <> +struct tiff_read_support_private<bits8,rgba_t> { + BOOST_STATIC_CONSTANT(bool,is_supported=true); + BOOST_STATIC_CONSTANT(int,bit_depth=8); + BOOST_STATIC_CONSTANT(int,color_type=PHOTOMETRIC_RGB); +}; +template <> struct tiff_read_support_private<bits16,gray_t> { BOOST_STATIC_CONSTANT(bool,is_supported=true); BOOST_STATIC_CONSTANT(int,bit_depth=16); @@ -94,6 +100,12 @@ BOOST_STATIC_CONSTANT(int,color_type=PHOTOMETRIC_RGB); }; template <> +struct tiff_write_support_private<bits8,rgba_t> { + BOOST_STATIC_CONSTANT(bool,is_supported=true); + BOOST_STATIC_CONSTANT(int,bit_depth=8); + BOOST_STATIC_CONSTANT(int,color_type=PHOTOMETRIC_RGB); +}; +template <> struct tiff_write_support_private<bits16,gray_t> { BOOST_STATIC_CONSTANT(bool,is_supported=true); BOOST_STATIC_CONSTANT(int,bit_depth=16); @@ -129,16 +141,18 @@ ~tiff_reader() { TIFFClose(_tp); } template <typename View> void apply(const View& view) { - unsigned short bps,photometric; + unsigned short bps,spp, photometric; point2<std::ptrdiff_t> dims=get_dimensions(); io_error_if(TIFFGetField(_tp,TIFFTAG_BITSPERSAMPLE,&bps)!=1); io_error_if(TIFFGetField(_tp,TIFFTAG_PHOTOMETRIC,&photometric)!=1); + io_error_if(TIFFGetField(_tp,TIFFTAG_SAMPLESPERPIXEL,&spp)!=1); io_error_if(dims!=view.dimensions(), "tiff_read_view: input view size does not match TIFF file size"); io_error_if(tiff_read_support_private<typename channel_type<View>::type, typename color_space_type<View>::type>::bit_depth!=bps || tiff_read_support_private<typename channel_type<View>::type, - typename color_space_type<View>::type>::color_type!=photometric, + typename color_space_type<View>::type>::color_type!=photometric || + mpl::size<typename color_space_type<View>::type>::value != spp, "tiff_read_view: input view type is incompatible with the image type"); std::size_t element_size=sizeof(pixel<typename channel_type<View>::type, layout<typename color_space_type<View>::type> >); @@ -166,14 +180,14 @@ }; // This code will be simplified... -template <typename CC> +template <typename CC> class tiff_reader_color_convert : public tiff_reader { private: CC _cc; public: - tiff_reader_color_convert(const char* filename) : + tiff_reader_color_convert(const char* filename) : tiff_reader(filename) {} - tiff_reader_color_convert(const char* filename,CC cc_in) : + tiff_reader_color_convert(const char* filename,CC cc_in) : tiff_reader(filename),_cc(cc_in) {} template <typename View> void apply(const View& view) { @@ -273,7 +287,7 @@ default: { // reads an image in incompatible format via TIFFReadRGBAImage rgba8_image_t rgbaImg(dims); - io_error_if(!TIFFReadRGBAImage(_tp, dims.x, dims.y, (uint32*)&gil::view(rgbaImg)(0,0), 0), + io_error_if(!TIFFReadRGBAImage(_tp, dims.x, dims.y, (uint32*)&gil::view(rgbaImg)(0,0), 0), "tiff_reader_color_convert::unsupported image format"); copy_and_convert_pixels(flipped_up_down_view(const_view(rgbaImg)), view, _cc); } @@ -353,7 +367,7 @@ /// \ingroup TIFF_IO /// \brief Loads the image specified by the given tiff image file name into the given view. /// Triggers a compile assert if the view color space and channel depth are not supported by the TIFF library or by the I/O extension. -/// Throws std::ios_base::failure if the file is not a valid TIFF file, or if its color space or channel depth are not +/// Throws std::ios_base::failure if the file is not a valid TIFF file, or if its color space or channel depth are not /// compatible with the ones specified by View, or if its dimensions don't match the ones of the view. template <typename View> inline void tiff_read_view(const char* filename,const View& view) { @@ -372,7 +386,7 @@ /// \ingroup TIFF_IO /// \brief Allocates a new image whose dimensions are determined by the given tiff image file, and loads the pixels into it. /// Triggers a compile assert if the image color space or channel depth are not supported by the TIFF library or by the I/O extension. -/// Throws std::ios_base::failure if the file is not a valid TIFF file, or if its color space or channel depth are not +/// Throws std::ios_base::failure if the file is not a valid TIFF file, or if its color space or channel depth are not /// compatible with the ones specified by Image template <typename Image> void tiff_read_image(const char* filename,Image& im) { /****************************************************************************** * __LICENCE_BEGIN__ * * __LICENCE_END__ *****************************************************************************/ ///@file ///@brief Test that RGBA images are detected by the TIFF reader. /// ///@author john.femiani(a)asu.edu /// /// #include <boost/test/unit_test.hpp> #include <boost/gil/gil_all.hpp> #include <boost/gil/extension/io/tiff_io.hpp> namespace gil = boost::gil; BOOST_AUTO_TEST_CASE(test_tiff_read_rgba8_image){ gil::rgba8_image_t rgb; ::boost::gil::tiff_read_image("images/rgba.tif", rgb); BOOST_CHECK_MESSAGE(rgb.width() == 86, "rgb.width() == 86 failed: Was " << rgb.width()); BOOST_CHECK_MESSAGE(rgb.height() == 64, "rgb.height() == 64 failed: Was " << rgb.width()); for (int y = 0; y < rgb.height(); ++y){ for (int x = 0; x < rgb.width(); ++x){ gil::rgba8_pixel_t pix = view(rgb)(x,y); BOOST_REQUIRE_MESSAGE(pix == gil::rgba8_pixel_t(128,128,128,255), "pix!=128,128,128,255 found pix=" << (int)pix[0] << "," << (int)pix[1] << "," << (int)pix[2] << "," << (int)pix[3] << " at x="<<x<<", y=" << y << "."); } } } BOOST_AUTO_TEST_CASE(test_tiff_read_rgb8_image_fails_on_rgba){ try { gil::rgb8_image_t rgb; ::boost::gil::tiff_read_image("images/rgba.tif", rgb); BOOST_FAIL("Reading an rgb image from an rgba tif should fail."); } catch (std::ios_base::failure& err ){ //Good, we should have an io error! } }

1 0

[boost.xpressive] RE for replacing problem
by Olaf Peter 14 Aug '08

14 Aug '08

Hi, my member function write() get called with string arguments like: Hello \n World \n Traceback ...\n NameError : name ... not defined \n etc. I want to add a prefix (a prompt '>>>' concete) so that the result will become: >>> Hello >>> World >>> Traceback .... >>> NameError: name ... not defined Yes, this comes from redirected python output. The simplest solution seems to use regex/xpressive: class redirector { const std::string m_prompt; const xpr::sregex m_re; const std::string m_re_fmt; public: redirector(const std::string& prompt = ">>> ") : m_prompt(prompt), m_re(xpr::sregex::compile("(\\n)!")), m_re_fmt(m_prompt + "\n") { } void write(const std::string& text) { std::cout << m_prompt << xpr::regex_replace(text, m_re, m_re_fmt); } ... }; where my regex won't work. What is the correct one since I can get a single '\n', a terminated '\n' or multiline strings separated by '\n'. Is this approach good for this problem? Anyway, I get a lot of warnings from constructor and write function, any ideas why? Thanks, Olaf

2 2

BGL: Trying to get my property bundle-using adjacency list to use a vector for its WeightMap.
by Geoff Hilton 14 Aug '08

14 Aug '08

Hi, I'm new to the boost and the BGL, and as the subject suggests, I'm trying to get my property bundle-using adjacency list to use a vector for its WeightMap. First off, the property bundles in question: template<size_t NumberOfBar> struct EdgeProperty { EdgeProperty(long double foo = 0):Foo(foo), Bar(NumberOfBar){} long double Foo; vector<long long> Bar; }; template<size_t NumberOfBar> struct VertexProperty { VertexProperty():Baz(NumberOfBar){} vector<pair<long long, long long> > Baz; }; The visitor: struct MyVisitor : public default_dijkstra_visitor { template <typename Vertex, typename Graph> void discover_vertex(Vertex u, const Graph& g) { cout << "discovered " << u << '\n'; } template <typename Edge, typename Graph> void tree_edge(Edge e, const Graph& g) { cout << "tree edge " << e << '\n'; } template <typename Edge, typename Graph> void examine_edge(Edge e, const Graph& g) { cout << "examining edge " << e << '\n'; } template <typename Vertex, typename Graph> void finish_vertex(Vertex u, const Graph& g) { cout << "finishing vertex " << u << endl; } }; The graph typedef: typedef adjacency_list< vecS, vecS, bidirectionalS, property<vertex_index_t, unsigned long long, VertexProperty<1> >, property<edge_index_t, unsigned long long, EdgeProperty<1> > > graph_t; Adding edges and vertices to the graph works without issue, as does assigning values to the properties, and navigating it, I was also able to get my test visitor to work.. using this code: int _tmain(int argc, _TCHAR* argv[]) { graph_t mygraph; //build graph //... //set up property accessors typedef EdgeProperty<1> EdgeProp; property_map<graph_t, long double EdgeProp::*>::type edge_foo_t = get(&EdgeProp::foo, mygraph); property_map<graph_t, vector<long long> EdgeProp::*>::type edge_bar_t = get(&EdgeProp::Bar, mygraph); property_map<graph_t, vertex_index_t>::type vertex_ind = get(vertex_index, mygraph); //dijkstra stuff size_t numberOfVertices = num_vertices(mygraph); std::vector<long double> distances(numberOfVertices, (numeric_limits<long double>::max)()); vector<vertex_descriptor> predecessors(numberOfVertices); MyVisitor vis; dijkstra_shortest_paths(mygraph, *vi, weight_map(edge_foo_t) .weight_map2(edge_bar_t) .distance_map( make_iterator_property_map(distances.begin(), vertex_ind) ) .predecessor_map( make_iterator_property_map(predecessors.begin(), vertex_ind) ) .visitor(vis) ); return 0; } However when I switch edge_bar_t and edge_foo_t within the weight_map/weight_map2 parentheses, I get this error (Visual Studio 2005) 'bool std::less<_Ty>::operator ()(const _Ty &,const _Ty &) const' : cannot convert parameter 1 from 'std::vector<_Ty>' to 'const D &' Of course that's normal because it's a vector. I figure I'm supposed to use make_iterator_property_map and somehow point it to &EdgeProp::Bar::begin() (or &EdgeProp::Bar::rbegin()) with a property_map<...> as I did with the others...but what I've tried so far hasn't worked. Any ideas? Thanks very much and best wishes, Geoff

1 1

Building boost 1.36
by Sean Farrow 13 Aug '08

13 Aug '08

Hi: I am trying to build boost 1.36, with the following command line: Bjam --toolset =msvc --build-type =complete. This gives me errors in bjam files. Any ideas what could be causing this error. Cheers Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3352 (20080813) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

2 2

bjam output
by Simon Pickles 13 Aug '08

13 Aug '08

Hi, I have finally got my head round boost::python and I'm loving it. I am on Ubuntu Hardy, stackless python 2.5, gcc 4.2.3. Two questions: 1) When using bjam to build libraries which expose C++ classes and functions to python, how can I use bjam to output the built libraries into a different folder to /bin/gcc-4.2.3/debug? 2) is this actually a debug library? if so, how do I create release versions? Many thanks Simon

3 4

Unattended regression tests are blocked by Windows Dialog
by Olav Kindt 13 Aug '08

13 Aug '08

Hi all, I have searched through some of the previous postings on this list, but have not been able to find the solution - so I'll try here. I have a test case that (due to an error of course) tries to run code like this: class MyObject { public: virtual void f() {}; }; void MyFailingTestCase() { MyObject * a = NULL; a->f(); } When running these tests in release mode - the whole process is stopped by a windows dialog letting be know that there was a system error (Access Violation) and asks the user to click OK/Debug. I have also tried to pass the --catch_system_errors=yes, but that did not help I am running 1_33_1 version of the library. (libboost_unit_test_framework-vc80-mt-1_33_1.lib) Does anybody know a way around this problem? Olav

5 5

Re: [Boost-users] Unattended regression tests are blocked byWindowsDialog
by Olav Kindt 13 Aug '08

13 Aug '08

>>> I have a test case that (due to an error of course) tries to run code >>> like this: >>> >[snip] >>> >>> void MyFailingTestCase() >>> { >>> MyObject * a = NULL; >>> >>> a->f(); >>> } >>> >>> When running these tests in release mode - the whole process is >>> stopped by a windows dialog letting be know that there was a system >>> error (Access Violation) and asks the user to click OK/Debug. >>> >>> I have also tried to pass the --catch_system_errors=yes, but that did >>> not help >>> >>> I am running 1_33_1 version of the library. >>> (libboost_unit_test_framework-vc80-mt-1_33_1.lib) >>> >>> Does anybody know a way around this problem? >> >> The only reasonable solution is to fix the test. According >> to standard C++ the expression "a->f()" using an a with >> a null pointer value causes undefined behaviour. >> Why don't you use a valid argument? Possible examples are: > >I believe the above is just an example. Under Windows, the dereferencing of >the null pointer leads to an access violation which can be handled via SEH >(Structured Exception Handling). MSVC provides a way to translate strutured >exceptions to C++ exceptions, which Boost.Test is supposed to use. >Regards, >Johan If I understand you (and the documentation) correctly - then the Boost.Test framework should have caught this (Structured Exception), and just reported the test as failed. Does this mean that the framework is broken (I'm using 1.33) Does anyone else have any experience with this - will an upgrade to 1.35 help? Olav

1 0

[boost-users][thread] upgrading lock
by Igor R 13 Aug '08

13 Aug '08

Hello, This's rather basic question, but I couldn't find any example in the docs. typedef boost::shared_lock<boost::shared_mutex> shared_lock; shared_mutex mutex_; /// { shared_lock lock(mutex_); // reading locked data... // here I want to midify the data, how can I upgrade the lock to be exclusive? } Thank you in advance.

2 1

general question on sentry in streams
by Ovanes Markarian 13 Aug '08

13 Aug '08

Hello all, this is probably a wrong place to write this post, but I hope to receive your thoughts anyway. Writing to moderated c++ group might open my email address to spammers, so I decided to write my post here. One of my collegues told me once that C++ streams are slower then Java. We did some trials (on a Win32 platform with Visual C++ 7.1) and he was able to prove this. Today when I read the standard on output steams I came accross the point, that most all stream functions must construct the nested sentry type. I suddenly remembered the article written by Nathan Myers on locales available at: http://www.cantrip.org/locale.html There he states, that in sentry a locking might be made in a multi-threaded environment. I looked in the implemenation of my STL distribution (which by default bundled with VC++ 7.1) and here we go. sentry locks in ctor and unlocks in dtor. So writing a character by character or integer by integer will produce the whole bunch of lock/unlock sequences, since standard states (in §27.6.2.5.4) that every call to operator << has to create sentry object instance and that explains to me why the std streams (at least on Windows are much slower as on Java). Would be great to hear your thoughts... Regards, Ovanes

1 0

1.36.0 && issue tracking
by Tim St. Clair 13 Aug '08

13 Aug '08

Folks - I was wondering what method is used to submit bugs which we find, other then spamming the list. I found quite a few in 1.35.0 and I'm hoping 1.36.0 fixes a lot of those issues. However if I find something, how/where can I submit that info. Is there a bugzilla server somewhere which people actually use? -- Regards, Timothy St. Clair [timothysc(a)gmail.com]

2 1

Re: [Boost-users] boost::math::tools and boost::distributions
by Jesse Perla 13 Aug '08

13 Aug '08

> > >Docs here: > > > http://www.boost.org/doc/libs/1_35_0/libs/math/doc/sf_and_dist/html/math_to… > > > >Note that these are considered "experimental" in the sense that their > >interfaces haven't been reviewed for formal inclusion in Boost. They are > >all rigorously tested though as they're fundamental to the implementation > of > >the rest of the library. So... please do use them, and if you find any > >interface SNAFU's that can be improved let us know! BTW the most likely > >reason for the interfaces to change is to facilitate improvements to their > >implementation and especially their efficiency. > > > >HTH, John. (sorry John, I sent my last email before getting the digest) Perfect. Since a snapshot of the interfaces exists for 1.35, then a port over to newer versions of boost is reasonable. Hopefully we can turn this into a top level project that does the baseline optimization/root finding people need before shopping for really specific tools/algorithms. -------- A couple of other questions on this beautiful distributions library - which I see as a great starting point for a lot of operations treating them as measures: * Is there any planned or existing support in the library for multi-dimensional distributions? In particular, bivariate norms with a covariance matrix passed in? Will the library design and notation support these sorts of extensions without too many problems? * Is there any way in the current library to pass in a user created discrete valued probability measure and have it as a "distribution" here? If not, I think I may write it, but as I am not a very good library programmer I would love to exploit any other work out there. I would need this to work for at least 1 and 2 dimension measures. * If we were to use a function to bundle a discrete valued function, is there a nice class/pattern out there that already combines the x-values and y-values into a single class? (I also want this later for implementing different interpolation algorithms returning functors after passing in a discrete function in the constructor). * Then I would write a specialization of this (2nd and higher dimension) for a markov measure. * Then, I want to write a general operator for unconditional expectation passing in a function object, and over a generic distribution as a measure from this library (though I will use it for the discrete measures to begin with). Specializing for different types of distributions, this could use exact analytical calculations, quadrature, or use monte-carlo methods. * Last, I want to write a conditional expectation operator that takes in a function object mapping reals^2 to reals, a distribution (would have to be 2 dimensional), the conditional (which would be a real for now, but could be generic), and what dimension the condition applies to. * Eventually, we may be able to tie together this operator with boost::lambda and boost::bind and we could up with a very elegant way to write out functions that involve conditional expectations. It may not have the performance of hand-tweaked fortran loops, but it should be a good enough place to start and infinitely preferable to matlab. The main use case I have for this is to implement easy/flexible notation for conditional distribution functions when writing out bellman equations for dynamic programming in economics. Most cases of this involve two dimensional markov measures (often approximated by Tauchen's algorithm from ARMA processes) If anyone is interested in this topic, has ideas, wants to work jointly, or plans to tell me that I am insane, please email me. My main fear is that I am a library user with a pretty good ability to think in generics, but with absolutely no chance of ever understanding what all of the crazy non-algorithmic code in these libraries does or writing it myself. -Jesse

1 0

Building boost with xml support (graph) and icu support (regex)
by Sean Farrow 13 Aug '08

13 Aug '08

Hi: How can I build boost with xml support in boost::graph, and icu support in Regex. What version of other libraries do I need? Cheers Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3352 (20080813) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

1 0

Re: [Boost-users] boost::math::tools ?
by Jesse Perla 13 Aug '08

13 Aug '08

> >You can google, e.g. > http://www.boost.org/doc/libs/1_35_0/libs/math/doc/sf_and_dist/html/math_to…>backgrounders/remez.html<http://www.boost.org/doc/libs/1_35_0/libs/math/doc/sf_and_dist/html/math_to…> > >Regards, >Olaf Thanks, Since I found these in the sandbox, I was worried that these were partially completed components that snuck into the build. So here are a few documentation organization suggestions that might clear up confusion: * If we follow the documentation down from the top level on boost, these were hard to find. For example, on the main math page: http://www.boost.org/doc/libs/1_35_0/libs/math/doc/html/index.html you need to go to the "Special Functions" section, which is named (properly) for all of the arctan, etc. and you wouldn't think it would have basic optimization/root finding/polynomials. The Special Functions section does link to the "Math Toolkit" which makes sense as a master name. * Perhaps the easiest solution would be to have another line in the "libraries" section on http://www.boost.org/doc/libs/1_35_0/libs/math/doc/html/index.html that mentions basic root finding/optimization and links to this same page But now that I see these pages say that these are in testing/development, I think my main question still stands: Are these (relatively) stable and usable or are they still at a pretty low level of completion? -Jesse

2 1

Downloading boost 1.36
by Sean Farrow 13 Aug '08

13 Aug '08

Hi: Has boost 1.36 been pushed yet. If yes where is the download link? Cheers Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3351 (20080813) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

2 1

[1.36.0] Release packaging problems
by Beman Dawes 13 Aug '08

13 Aug '08

Grrr... 1.36.0 is up on SourceForge, but due to a screw-up on my part the .bz2 and .gz files don't include the generated docs. The .7z and .zip files do have the generated docs. The problem was caused by having to run some of the release process on Windows, some on Linux, and then combining the pieces by hand. That's a result of doc changes breaking the doc build on Windows. I'm going to be out of the office all day on non-Boost business, so won't get a chance to work on straightening out the mess until late today or tomorrow. --Beman

1 0

[spirit] repeat_p parameters
by piotr270977＠interia.pl 13 Aug '08

13 Aug '08

Hi All I wonder about expression repeat_p parameter. int c; c=12; repeat_p(boost::ref(c)) is OK but what about repeat_p(boost::ref(c) - 1 ) ??? (compiling but not working correctly) The only solution I have found is int c, c1; c=12; c1 = c-1; repeat_p(boost::ref(c1)) Is it possible to insert an expression in repeat_p without c1 extra variable ? ---------------------------------------------------------------------- Podbij Dziki Zachod, wygraj laptopa lub iPoda >> http://link.interia.pl/f1ede

1 0

boost::math::tools ?
by Jesse Perla 13 Aug '08

13 Aug '08

Poking around in the headers of 1.35 I found code: polynomial.hpp, roots, series, minima, remez, and a few others I would love to use. However, I don't see any mention of these in the boost::math documentation. Do these work? Are they kept up to date? Any reason why they are not mentioned in the docs or did I just miss it? Thanks, Jesse

3 2

[Building] 64 bit on Linux
by Pearl Rothman 13 Aug '08

13 Aug '08

How can I build 64 bit boost libraries on Linux, preferably using gcc?

3 2

Re: [Boost-users] MS SDK 2003 Compiler Configuration
by Bob Monat 13 Aug '08

13 Aug '08

2 1

Re: [Boost-users] Multi-index container (Modifying non-unique key in the container)
by JOAQUIN M. LOPEZ MUÑOZ 12 Aug '08

12 Aug '08

Hi Ramesh, ________________________________ De: boost-users-bounces(a)lists.boost.org [boost-users-bounces(a)lists.boost.org] En nombre de Ramesh [rramesh1(a)gmail.com] Enviado el: martes, 12 de agosto de 2008 7:40 Para: boost-users(a)lists.boost.org Asunto: [Boost-users] Multi-index container (Modifying non-unique key in the container) > > Hi. > > I am using boost multi-index container for storing objects of type class A, in the class key1 & > Key 3 are unique and key2 is non-unique. I try to insert objects of type A and it works fine. > No issues. > > At some point after the insertion, I wish to modify the key2 to 20 in the container. Can I do this > with modify? If yes How do I define the iterator (since I need to do a find based on key1 but > modify key2 in the container) You have two options: 1. Use modify(), which is passed the entire element rather than the key, and modify key2 at your pleasure. 2. Project the key1-iterator to a key2-iterator using the projection facilities: http://www.boost.org/libs/multi_index/doc/tutorial/basics.html#projection and then use modify_key() with the key2-iterator. BTW, I've noticed that you're wrapping the A objects into a DataMap class that, oddily enough, replicates the key1, key2 and key3 members. Why aren't you using A members directly thus disposing of the DataMap wrapper? Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

2 1

sorting a ublas matrix
by Ed 12 Aug '08

12 Aug '08

#include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/io.hpp> using namespace boost::numeric::ublas; matrix<MyObject> m_MyObjects(nRows, nCols); I have a ublas matrix of objects as declared above... Is there a way within the Boost lib (i.e. something I don't have to write much custom code to use) that I can use to sort the matrix by a value of one of the data members of MyObject? For example If class MyObject { int thisOne; } and m_MyObjects(0,0).thisOne = 1; m_MyObjects(1,0).thisOne = 0; m_MyObjects(0,1).thisOne = 4; m_MyObjects(1,1).thisOne = 2; It will sort the matrix so that m_MyObjects(0,0).thisOne = 0; m_MyObjects(1,0).thisOne = 1; m_MyObjects(0,1).thisOne = 2; m_MyObjects(1,1).thisOne = 4; Ed

2 1

boost::serialization xml_archive usage
by Markus Schwarzenberg 12 Aug '08

12 Aug '08

Hi, i just recently startet to dip into boost::serialization. In the examples directory, there is demo.cpp, in which text_archive is used. From my understanding of the tutorial ("In addition to text archives, the library includes archive class for native binary data and xml formatted data Interfaces to all archive classes are all identical.") it should be possible to switch from text_archive to xml_archive by just replacing text_[io]archive by xml_[io]archive and include the required header files. However, when I do this, I'm getting lots of compiler error messages like (Linux, gcc-4.1.2, boost-1.35.0) /usr/include/boost-1_35/boost/archive/basic_xml_oarchive.hpp: In member function 'void boost::archive::basic_xml_oarchive<Archive>::save_override(T&, int) [with T = const bus_schedule, Archive = boost::archive::xml_oarchive]': /usr/include/boost-1_35/boost/archive/detail/interface_oarchive.hpp:64: instantiated from 'Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = const bus_schedule, Archive = boost::archive::xml_oarchive]' demo-using-xml.cpp:286: instantiated from here /usr/include/boost-1_35/boost/archive/basic_xml_oarchive.hpp:88: error: no matching function for call to 'assertion_failed(mpl_::failed************ boost::serialization::is_wrapper<const bus_schedule>::************)' /usr/include/boost-1_35/boost/archive/basic_xml_iarchive.hpp: In member function 'void boost::archive::basic_xml_iarchive<Archive>::load_override(T&, int) [with T = bus_schedule, Archive = boost::archive::xml_iarchive]': /usr/include/boost-1_35/boost/archive/xml_iarchive.hpp:74: instantiated from 'void boost::archive::xml_iarchive_impl<Archive>::load_override(T&, int) [with T = bus_schedule, Archive = boost::archive::xml_iarchive]' /usr/include/boost-1_35/boost/archive/detail/interface_iarchive.hpp:63: instantiated from 'Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = bus_schedule, Archive = boost::archive::xml_iarchive]' demo-using-xml.cpp:297: instantiated from here The original demo.cpp however compiles fine. The difference to the version using xml_archive is just: --- demo.cpp 2008-08-11 18:06:45.394403000 +0200 +++ demo-using-xml.cpp 2008-08-12 07:33:33.147259000 +0200 @@ -14,8 +14,8 @@ #include <boost/archive/tmpdir.hpp> -#include <boost/archive/text_iarchive.hpp> -#include <boost/archive/text_oarchive.hpp> +#include <boost/archive/xml_iarchive.hpp> +#include <boost/archive/xml_oarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> @@ -282,7 +282,7 @@ void save_schedule(const bus_schedule &s, const char * filename){ // make an archive std::ofstream ofs(filename); - boost::archive::text_oarchive oa(ofs); + boost::archive::xml_oarchive oa(ofs); oa << s; } @@ -291,7 +291,7 @@ { // open the archive std::ifstream ifs(filename); - boost::archive::text_iarchive ia(ifs); + boost::archive::xml_iarchive ia(ifs); // restore the schedule from the archive ia >> s; @@ -352,7 +352,7 @@ std::cout << original_schedule; std::string filename(boost::archive::tmpdir()); - filename += "/demofile.txt"; + filename += "/demofile.xml"; // save the schedule save_schedule(original_schedule, filename.c_str()); What am I doing wrong? Thanks, Markus Schwarzenberg

2 1

[Boost.Thread] Scheduling
by Ruediger Berlich 12 Aug '08

12 Aug '08

Hi there, at the end of this mail is a small program that starts three threads out of a fourth one ("thread4"). thread1, 2 and 3 are not allowed to start execution before a certain condition is met (here: go_ is set to true and the threads are notified of the changed condition). The threads increment a variable. Once this variable has reached a threshold (here: 10), execution is supposed to stop. This is done by calling the interrupt() function on each thread, which in turn catch the corresponding exception and act on it. All this seems to work nicely, except for the fact that the "master thread" (thread4 in this example) does not seem to get any processing time over a long period. Hence thread 1,2 and 3 count to a very high number before the stop condition is met. Here is the output of the program: Starting threads Going to sleep for 2 seconds in startAndStopThreads() Hello world Nr. 0 from thread 1 Hello world Nr. 1 from thread 2 [...] Hello world Nr. 6167 from thread 2 Hello world Nr. 6168 from thread 2 Sending interrupt Received interrupt in thread 3 Received interrupt in thread 1 Received interrupt in thread 2 Done ... Occasionally the counting can go on up to a few hundred thousand. This is on a single-processor machine with OpenSUSE 11/64 bit, g++ 4.3.1 and a recent trunk version of Boost 1.36 . The situation is much better on a four-processor system with the same operating system - the counter typically reaches only a few hundred there, presumably as thread4 gets access to a time slice more quickly (but why isn't it running permanently on a four processor machine - there are only 4 active threads ?). Is there anything that can be done to improve the time slices allocated to thread4 ? I am already calling the yield() function in thread1, 2 and 3. Thanks and Best Regards, Ruediger /*********************************************************************/ #include <iostream> #include <boost/cstdint.hpp> #include <boost/bind.hpp> #include <boost/exception.hpp> #include <boost/thread/mutex.hpp> #include <boost/thread/condition.hpp> #include <boost/thread/condition_variable.hpp> #include <boost/thread/thread.hpp> #include <boost/date_time.hpp> using namespace std; class test { public: test() :jointData_(0), MAXJOINTDATA(10), go_(false), thread1(boost::bind(&test::sayHello, this, 1)), thread2(boost::bind(&test::sayHello, this, 2)), thread3(boost::bind(&test::sayHello, this, 3)) { /* nothing */ } void startAndStopThreads(){ std::cout << "Going to sleep for 2 seconds in startAndStopThreads()" << std::endl; boost::this_thread::sleep(boost::posix_time::seconds(2)); boost::unique_lock<boost::mutex> lock(helloMutex_); go_=true; lock.unlock(); readyToGo_.notify_all(); while(true){ boost::unique_lock<boost::mutex> lock2(helloMutex_); if(jointData_ >= MAXJOINTDATA){ go_=false; std::cout << "Sending interrupt" << std::endl; thread1.interrupt(); thread2.interrupt(); thread3.interrupt(); break; } } thread1.join(); thread2.join(); thread3.join(); } void sayHello(const uint16_t threadNumber){ while(true){ boost::unique_lock<boost::mutex> lock(helloMutex_); while(!go_) { try{ readyToGo_.wait(lock); } catch(boost::thread_interrupted&){ std::cout << "Received interrupt in thread " << threadNumber << std::endl; return; } } std::cout << "Hello world Nr. " << jointData_++ << " from thread " << threadNumber << std::endl; boost::this_thread::yield(); } } private: volatile uint32_t jointData_; const uint32_t MAXJOINTDATA; bool go_; boost::mutex helloMutex_; boost::condition_variable readyToGo_; boost::thread thread1, thread2, thread3; }; main(){ test Test; std::cout << "Starting threads" << std::endl; // Test.startAndStopThreads(); // This doesn't make a difference boost::thread thread4(boost::bind(&test::startAndStopThreads,&Test)); thread4.join(); std::cout << "Done ..." << std::endl; }

4 10

mpl tuple / pair
by Hicham Mouline 12 Aug '08

12 Aug '08

hello, as much as boost::tuple extends the idea of std::pair from 2 to n, what would be the type that extends boost::mpl::pair to n? mpl::vector? rds,

2 1

Re: [Boost-users] boost lapack bindings
by Jesse Perla 12 Aug '08

12 Aug '08

Omar: I am going through the exact same thing right now. See the thread: http://lists.boost.org/MailArchives/ublas/2008/08/2906.php At one point I posted the steps I used with the Intel Compiler in visual studio and Intel MKL's lapack. (I think that the ublas group is better for these topics). -Jesse

1 0

G++ compilation warnings in 1.36 beta
by Robert Mecklenburg 12 Aug '08

12 Aug '08

I'm getting these compilation warnings in serialization /home/mecklen/work/boost-install/include/boost-1_36/boost/serialization/array.hpp: In instantiation of 'void boost::serialization::serialize(Archive&, boost::array<T, N>&, unsigned int) [with Archive = boost::archive::binary_oarchive, T = double, unsigned int N = 3u]': /home/mecklen/work/boost-install/include/boost-1_36/boost/serialization/serialization.hpp:133: instantiated from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_oarchive, T = boost::array<double, 3u>]' /home/mecklen/work/boost-install/include/boost-1_36/boost/archive/detail/oserializer.hpp:144: instantiated from 'void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::binary_oarchive, T = boost::array<double, 3u>]' src/LocationHistory.cpp:73: instantiated from here /home/mecklen/work/boost-install/include/boost-1_36/boost/serialization/array.hpp:127: warning: unused parameter 'version' >From this code in include/boost-1_36/boost/serialization/array.hpp: template <class Archive, class T, std::size_t N> void serialize(Archive& ar, boost::array<T,N>& a, const unsigned int version) { ar & make_nvp("elems",a.elems); } Could we comment out the unused variable? Thanks, -- Robert

1 0

Re: [Boost-users] [python] partially resolved: the never ending
by Jean-Francois Bastien 12 Aug '08

12 Aug '08

> 1. With VS2005 it is NOT a GoodIdea(TM) to mix different > types of binaries for one executable, since the (stupid) > linker of vs2005 succeeds without error sometimes creating > executables that fail to be debugged and/or crash at random > points during execution. Summary: VC8 linker sucks in many > aspects, so don't do that. FWIW it is possible to mix debug/release DLLs with Visual Studio, I do it with a lot of DLLs with success. You just have to be very careful about a few things, for example: - Watch out for the one definition rule, especially across DLLs. Most STL types in the standard Visual Studio library don't have the same size in debug as in release! That includes std::string as well as the containers (std::vector and others), and non-STL types with members that exist depending on _DEBUG/NDEBUG. This can be mitigated by using the proprocessor macros _SECURE_SCL=0 and _HAS_ITERATOR_DEBUGGING=0, but this is a tradeoff. Violating that causes hard to debug stack corruptions. - Make sure that allocation/deallocation is symetric. If you do a new/malloc with one runtime and a delete/free with another you're asking for trouble. Don't forget about the global new/delete too! Basically you have to analyze what passes through DLL APIs. JF

1 0

asio udp bad_alloc?
by Lewis, Ambrose J. 12 Aug '08

12 Aug '08

Hi All: I'm trying (somewhat unsuccessfully) to use a udp::socket in my program. My system is running Ubuntu 7.04 and boost 1.35 After a while, the program dies with the following message: terminate called after throwing an instance of 'std::bad_alloc' The line that causes the problem is: (*m_socket).send_to(boost::asio::buffer(xmlData.m_xmlString), m_remoteEndpoint); I think that the client program isn't keeping up and my send buffer is overflowing. Is there any way to confirm this thought? Could I use something like a select statement to see if this UDP socket is ready for writing? Please note that I set the size of the send buffer to 8192: m_socket->set_option(udp::socket::send_buffer_size(8192)); Thanks for the help and/or suggestions! THANXS amb

1 0

FW: Boost Build Variations: One Missing, One Extra!
by Bilokon, Paul 12 Aug '08

12 Aug '08

Forwarding this to Boost.Users (at the moderator's discretion), as this is a Boost usage question, as well as a Boost.Build question. Many thanks, Paul > ______________________________________________ > From: Bilokon, Paul > Sent: Monday, August 11, 2008 4:41 PM > To: 'boost-build(a)lists.boost.org' > Subject: Boost Build Variations: One Missing, One Extra! > > Hi, > > Apologies if the answer to this question is supposed to be obvious. I > am trying to build Boost using the following command: > > "E:\dev\external\boost\boost_1_35_0\bjam\bjam.exe" > --build-type=complete > --build-dir="E:\dev\external\boost\boost_1_35_0\build" > --toolset=msvc-8.0 stage > > Now, as far as I understand, --build-type=complete should give me all > combinations of > > variant=debug,release; threading=single,multi; link=static,shared > > I'm expecting to see 2^3 = 8 combinations in total. As a result I get > this (I do hope the original formatting gets preserved): > > +-- > E:\dev\external\boost\boost_1_35_0\build\boost\bin.v2\libs\date_time\b > uild\msvc-8.0 > | > +-- debug > | | > | +-- link-static > | | | > | | +-- runtime-link-static: > libboost_date_time-vc80-sgd-1_35.lib > | | | | (variant=debug, > threading=single, link=static) > | | | | > | | | +-- threading-multi: > libboost_date_time-vc80-mt-sgd-1_35.lib > | | | (variant=debug, threading=multi, > link=static) > | | | > | | +-- threading-multi: > libboost_date_time-vc80-mt-gd-1_35.lib > | | (variant=debug, threading=multi, > link=static) > | | > | +-- threading-multi: > boost_date_time-vc80-mt-gd-1_35.dll > | (variant=debug, threading=multi, > link=shared) > | > +-- release > | > +-- link-static > | | > | +-- runtime-link-static: > libboost_date_time-vc80-s-1_35.lib > | | | (variant=release, > threading=single, link=static) > | | | > | | +-- threading-multi: > libboost_date_time-vc80-mt-s-1_35.lib > | | (variant=release, > threading=multi, link=static) > | | > | +-- threading-multi: > libboost_date_time-vc80-mt-1_35.lib > | (variant=release, > threading=multi, link=static) > | > +-- threading-multi: boost_date_time-vc80-mt-1_35.dll > (variant=release, > threading=multi, link=shared) > > Indeed, I do get 8 combinations, *but* I get two of > > variant=debug, threading=multi, link=static > > (under different names -- one with -s, the other one without) and I > get two of > > variant=release, threading=multi, link=static > > (under different names -- one with -s, the other one without) but I > never get > > variant=debug, threading=single, link=shared > variant=release, threading=single, link=shared > > Would you please explain to me what's going on? > > Many thanks, > Paul - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - This message is intended only for the personal and confidential use of the designated recipient(s) named above. If you are not the intended recipient of this message you are hereby notified that any review, dissemination, distribution or copying of this message is strictly prohibited. This communication is for information purposes only and should not be regarded as an offer to sell or as a solicitation of an offer to buy any financial product, an official confirmation of any transaction, or as an official statement of Lehman Brothers. Email transmission cannot be guaranteed to be secure or error-free. Therefore, we do not represent that this information is complete or accurate and it should not be relied upon as such. All information is subject to change without notice.

2 2

Multi-index container (Modifying non-unique key in the container)
by Ramesh 12 Aug '08

12 Aug '08

Hi. I am using boost multi-index container for storing objects of type class A, in the class key1 & Key 3 are unique and key2 is non-unique. I try to insert objects of type A and it works fine. No issues. At some point after the insertion, I wish to modify the key2 to 20 in the container. Can I do this with modify? If yes How do I define the iterator (since I need to do a find based on key1 but modify key2 in the container) Here is the code snippet: ----------- class A { private: std::string key1; long key2; long key3; < Other class members > }; struct DataMap { std::string key1; long key2; long key3; A *pObj; }; typedef multi_index_container< DataMap, indexed_by< ordered_unique< tag <Key1>, BOOST_MULTI_INDEX_MEMBER(DataMap,std::string,Key1)>, ordered_non_unique< tag<Key2>,BOOST_MULTI_INDEX_MEMBER(DataMap,long,Key2)>, ordered_unique< tag<Key3>,BOOST_MULTI_INDEX_MEMBER(DataMap,long,Key3)> > > tDMap; class myclass { private: tDMap Map; public: insert(std::string, long , long, A *); }; myclass::insert(std::string key1, long key2, long key3, A *pObj) { } main() { std::string key1 = "Test String"; A abc; abc.key1 = key1; abc.key2 = 10; abc.key3 = 400; insert(key1, key2, key3, &abc); } ------------------- Thanks in advance! Ramesh

1 0

Visual C++ 2005 error C2666 with variants.
by Bill McLean 12 Aug '08

12 Aug '08

I have spent a couple of hours trying to resolve the following error when building our system. We have some code that has been compiling and working with GCC with no issues. However building it with MS VC20005 SP1 creates the following error. We are using boost 1.34.1: Error 2 error C2666: 'boost::variant<T0_,T1,T2,T3,T4,T5,T6,T7>::convert_construct' : 2 overloads have similar conversions c:\projects\ardev\currentdev\externallibs\boost\boost\variant\variant.hpp 1342 I have searched the Boost list archives and found this post for boost 1.33.1: http://lists.boost.org/Archives/boost/2006/03/102375.php The author of this post Peter Schreegle did not receive a reply. He attached the below code and build log. It appears that this an issue for variants under visual studio 2005 SP1. Does anyone know if this is an issue for VS 2008? Is this issue for boost 1.35.0 being built by VS 2005 or VS 2008? #include <boost/variant.hpp> typedef boost::variant<char, int, double> numeric_type_variant; class numeric_type : public numeric_type_variant { public: /// Default constructor. numeric_type() : numeric_type_variant() { } template <typename T> /// Converting constructor. numeric_type(T const& t) : numeric_type_variant(t) { } // some more code }; int main(int argc, char* argv[]) { char ba; int bb; double bc; numeric_type a; numeric_type b(ba); numeric_type c(bb); numeric_type d(bc); a = ba; a = bb; a = bc; return 0; } ************************************************************* This is the build log: ------ Build started: Project: test_variant, Configuration: Debug Win32 ------ Compiling... test_variant.cpp c:\_ngi\toolkits\boost_1_33_1\boost\variant\variant.hpp(1342) : error C2666: 'boost::variant<T0_,T1,T2>::convert_construct' : 2 overloads have similar conversions with [ T0_=char, T1=int, T2=double ] c:\_ngi\toolkits\boost_1_33_1\boost\variant\variant.hpp(1327): could be 'void boost::variant<T0_,T1,T2>::convert_construct<char,int,double,boost::detail:: variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,b oost::detail::variant::void_,boost::detail::variant::void_,boost::detail::va riant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boo st::detail::variant::void_,boost::detail::variant::void_,boost::detail::vari ant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost ::detail::variant::void_,boost::detail::variant::void_,boost::detail::varian t::void_,boost::detail::variant::void_>(const boost::variant<T0_,T1,T2> &,long)' with [ T0_=char, T1=int, T2=double ] c:\_ngi\toolkits\boost_1_33_1\boost\variant\variant.hpp(1258): or 'void boost::variant<T0_,T1,T2>::convert_construct<const T>(T &,int,boost::mpl::false_)' with [ T0_=char, T1=int, T2=double, T=numeric_type ] while trying to match the argument list '(const numeric_type, long)' c:\_ngi\toolkits\boost_1_33_1\boost\variant\variant.hpp(1580) : see reference to function template instantiation 'boost::variant<T0_,T1,T2>::variant<T>(const T &)' being compiled with [ T0_=char, T1=int, T2=double, T=numeric_type ] c:\_ngi\toolkits\boost_1_33_1\boost\variant\variant.hpp(1590) : see reference to function template instantiation 'void boost::variant<T0_,T1,T2>::assign<T>(const T &)' being compiled with [ T0_=char, T1=int, T2=double, T=numeric_type ] c:\_schrott\test_variant\test_variant\test_variant.cpp(36) : see reference to function template instantiation 'boost::variant<T0_,T1,T2> &boost::variant<T0_,T1,T2>::operator =<numeric_type>(const T &)' being compiled with [ T0_=char, T1=int, T2=double, T=numeric_type ] Build log was saved at "file://c:\_schrott\test_variant\test_variant\Debug\BuildLog.htm" test_variant - 1 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

2 1

ASIO - How to get mac address from interface
by Jean-Sebastien Stoezel 11 Aug '08

11 Aug '08

Hi, Is there a way to get the MAC address of the interface associated with a TCP socket, using the ASIO library? Thanks, Jean

1 0

Preprocessor problems
by Robert Dailey 11 Aug '08

11 Aug '08

Hi, I'm using Boost.Preprocessor to create specializations of a class I have named InputSource. in the iteration loop, I have the following: # define i BOOST_PP_ITERATION() # define INPUT_repeat(z, n, user) user template<typename t_return, BOOST_PP_ENUM_PARAMS(i, typename t_param)> class InputSource< t_return, BOOST_PP_ENUM_PARAMS(i, t_param) BOOST_PP_COMMA_IF( BOOST_PP_AND(BOOST_PP_NOT_EQUAL(i, 0), BOOST_PP_NOT_EQUAL(i, MAX_PARAMETERS)) ) BOOST_PP_ENUM(BOOST_PP_SUB(MAX_PARAMETERS, i), INPUT_repeat, detail::no_param) > The part that isn't working is the BOOST_PP_COMMA_IF line. When I look at the preprocessor output generated by MSVC9, I get this: template<typename t_return, typename t_param0> class InputSource< t_return, t_param0 BOOST_PP_IIF_BOOST_PP_BOOL_BOOST_PP_BITAND_BOOST_PP_BOOL_BOOST_PP_NOT_EQUAL(1, 0)BOOST_PP_BOOL_BOOST_PP_NOT_EQUAL(1, 5)(BOOST_PP_COMMA, BOOST_PP_EMPTY)() detail::no_param , detail::no_param , detail::no_param , detail::no_param > My iteration limits has been defined as follows: # ifndef MAX_PARAMETERS # define MAX_PARAMETERS 5 # endif # define BOOST_PP_ITERATION_LIMITS (1, MAX_PARAMETERS) I would have expected the preprocessor to show a comma or a blank line, but instead it looks like some macros were not expanded. Any solutions to this problem?

1 2

Concept check vs enable_if
by joel falcou 11 Aug '08

11 Aug '08

Considering the scope of these two libraries, I still wonder which one to use in some cases. For example, let's say I have a set of functions that can only take integers as parameters, what's the correct practice : use enable_if to have SFINAE makes the compiler outputs something like "no such fonction" or have a concept check for Integer and have a concept related error indicating people what happens. Is there any policies or is this a matter of tastes ?

5 16

Re: [Boost-users] weak_ptr for intrusive_ptr
by Alan M. Carroll 11 Aug '08

11 Aug '08

At 09:00 PM 8/10/2008, you wrote: >On Sun, Aug 10, 2008 at 9:47 AM, Alan M. Carroll ><amc(a)network-geographics.com> wrote: >> I greatly prefer intrusive_ptr to shared_ptr, but one drawback of that is there is no equivalent of weak_ptr. I have started work on a class to do that and my biggest question, honestly, was what to name it. > >Have you considered the allocator support in shared_ptr? It makes it >possible to allocate the control block in the same memory block as the >managed object. Between this and the aliasing support in shared_ptr, >I've found intrusive_ptr's use rather limited. I haven't really consider the shared_ptr allocator support. I use primarily intrusive_ptr for historical and implementation reasons. I started using intrusive pointers over a decade ago (my own version at first, later Boost, when it became available). Back then shared_ptr had a much poorer and less usable interface (IIRC, it didn't support casting very well which was a big thing for me). I have long since built support classes to make use of intrusive_ptr very simple, just a 1 line inherit, plus the personal familiarity. Asking why I don't use shared_ptr and its allocator support is effectively asking "why don't you got to a lot of effort to get the same functionality you have now?". Not to disparage shared_ptr, but that's just not an attractive option for me. I might view it differently if I were a newbie, but I'm not, so there it is. Implementing my own intrusive_weak_ptr was less work overall *for me* than switching to shared_ptr. Moreover, shared_ptr doesn't solve the issue that is most important to me, safe conversion to and from raw pointers. This shows up in a couple of places 1) Self registration. 2) Handle from this. 3) Some other very esoteric places that I haven't the energy to go in to and no one else would find interesting. Yes, there are work arounds for shared_ptr, but why not just solve it up front with intrusive_ptr? If, as the flip side of me, you use shared_ptr everywhere else and this doesn't come up much, sure. But my situation is the other way around. Boost takes the right approach, in that it adapts to the peculiarities of the client, it doesn't force the client to adapt to Boost's peculiarities.

1 0

[boost:regex]does boost:regex support char set substraction?
by gj_uestc 11 Aug '08

11 Aug '08

Hi all, I got another problem here while trying using boost:regex: does boost:regex support char set substraction? For example:I give boost:regex an expression"[a-z]-[d-f]".I would like the boost take the second "-" as and substracion. So this expression is supposed to be translated as "[a-c]|[f-z]".I am wonderring whether boost:regex has such substraction symbols? Thanks && Regards Juan

2 1

[python|1.36_beta] Why am I forced to define BOOST_PYTHON_STATIC_LIB?
by Markus Werle 11 Aug '08

11 Aug '08

Hi! I am using VS2005SP1, compiling debug version with MFC in a static lib. No problem for boost libs to auto-select the correct (static) libraries all the time. Enters Boost.Python which deliberately chooses to ignore my compiler settings and to set BOOST_PYTHON_DYNAMIC_LIB and then later at boost\python\detail\config.hpp, line 128: #ifdef BOOST_PYTHON_DYNAMIC_LIB # define BOOST_DYN_LINK // <---- BOOM! #endif which obviously is properly catched in auto_link.hpp, line 292 Everything works as expected if I define BOOST_PYTHON_STATIC_LIB, but I do not understand why I have to take that extra effort. All other boost libs play together with my the compiler settings ... Am I missing something? Markus

2 4

[Boost.asio] Second multicast async_send_to returns 10009
by John Urberg 11 Aug '08

11 Aug '08

I'm using boost asio to send out multicast hailing messages every 15 seconds from an ActiveX control using boost 1.35.0 and VC9. I had a proof of concept ActiveX working fine, but in my production ActiveX, I'm able to send the first message successfully, but every subsequent message returns a 10009 error. Here is the code: MulticastServer::MulticastServer( boost::asio::io_service& io_service, string addr, int port, int seconds) : endpoint(boost::asio::ip::address::from_string(addr), port) , socket(io_service, endpoint.protocol()) , timer(io_service) , server_port(server_port) , seconds(seconds) { socket.set_option(boost::asio::ip::multicast::hops(32)); } void MulticastServer::HandleTimeout(const boost::system::error_code& error) { string message = BuildHailMessage(); std::strcpy(buffer, message.c_str()); socket.async_send_to( boost::asio::buffer(buffer, message.length()), endpoint, boost::bind( &MulticastServer::HandleSendTo, this, boost::asio::placeholders::error)); } void MulticastServer::HandleSendTo(const boost::system::error_code& error) { timer.expires_from_now(boost::posix_time::seconds(seconds)); timer.async_wait(boost::bind(&MulticastServer::HandleTimeout, this, boost::asio::placeholders::error)); } Any ideas what would cause this error message? Also, if I use a string instead of char[] for the buffer, I always receive a 'string iterator not dereferencable' assertion failure. How could I fix that so I can use std::string instead of a char[] buffer? Thanks, John

3 4

Newbie
by Craig Petty 11 Aug '08

11 Aug '08

What headers are the sockets in boost?Hope someone i can help me.:) Craig

2 1

[python] a lot of hassle getting started with embedding and vc8
by Markus Werle 11 Aug '08

11 Aug '08

Hi folks! Probably someone with some hints on how to fix this. I may have overlooked portions of the doc ... Status: boost_1_36_beta installed using bjam for vc8/SP1 against python-2.5.2; python test suite shows no failure. Trying to embed boost::python/Python in a Visual Studio 2008 project: I managed to compile some code in debug mode (linking to python25.lib release mode). The embedded python interpreter (using the precompiled version of python-2.5.2) throws an exception even on statements like "a=2", having "error_already_set", but PyErr_Print(); does not show a message, neither in Debugger nor after calling the executable from the command line. This is odd. So it is time for a debug session - which is where true trouble begins: fetch python source code, compile with vc8 in order to create python25_d.lib and friends. Now what I really want is a *debug* executable with *statically* linked python and boost_python, so I tell it to the boost library by defining BOOST_DEBUG_PYTHON and BOOST_PYTHON_STATIC_LIB. Defining BOOST_PYTHON_STATIC_LIB is necessary to have auto linker link to the static boost_python libs (libboost_python-vc80-mt-sgd.lib) [see http://thread.gmane.org/gmane.comp.lib.boost.user/38461/focus=38600] but has a nasty side effect: Now the compiler decides python_25.lib has to be linked to rather than python25_w.lib. OUCH! I digged into all headers (also using find/grep) to figure out why boost::python now thinks that python25.lib has to be linked into the executable, but could not find the autolinker part for python*.lib. The key part is in boost/python/detail/config.hpp, line 68 // backwards compatibility: #ifdef BOOST_PYTHON_STATIC_LIB # define BOOST_PYTHON_STATIC_LINK # elif !defined(BOOST_PYTHON_DYNAMIC_LIB) # define BOOST_PYTHON_DYNAMIC_LIB #endif I feel uncomfortable about the "backwards compatibility" tag in the comment. So there must be some other way to get around this mess. It all comes down to hinder BOOST_PYTHON_DYNAMIC_LIB to be defined. Looking at [BINARY_DIST]python-2.5.2\include\pyconfig.h - a hand-written version of the python config stuff, there might be some issue with with the "pragma comment(lib" portion ... ================================================== OK, let us revert to dynamic linking then: Using the code from example/quickstart/embedding.cpp I get a <cite> Unhandled exception at 0x00000000 in TestBoostPythonEmbedding.exe: 0xC0000005: Access violation reading location 0x00000000. </cite> triggered by python::object main = python::import("__main__"); calling (*) python::handle<> module(PyImport_ImportModule(n)); // BOOM! but calling PyImport_ImportModule("__main__"); directly succeeds. but stepping into PyImport_ImportModule(n) fails. What's wrong with (*) ? The same game runs without error (!!!!) in release mode. To be honest: I am lost. Any help or hint appreciated. Markus

1 0

[boost.regex]Does boost:u32regex recognize the unicode named blocks like "\p{IsBasicLatin}"?
by gj_uestc 11 Aug '08

11 Aug '08

Hi,all Nowadays I am using boost:u32regex to do some regular expression processing.But it seems that "/p{IsBasicLatin}"is not a accessable expression by boost::make_u32regex(tmp).Does boost:regex not suppor the named unicode blocks or I have to pass some other flags to the library? Now I was using the defult flag wich indicate using perl syntactic. thanks&regards Juan

3 5

[ANN] Boost.Proto committed to trunk
by Eric Niebler 11 Aug '08

11 Aug '08

I've just committed Boost.Proto v4 to trunk (http://svn.boost.org/trac/boost/changeset/48079) This version is represents a significant reworking from the version that was reviewed and accepted back in April. Although the code is quite stable now, I have not yet integrated all the feedback about the documentation. It is my intention to bring the docs up to Boost standards in time to get Proto into 1.37. I am leaving the old version of Proto at boost/xpressive/proto for the time being, since some other projects (Xpressive, Spirit2 Qi and Karma) are relying on it. It will be removed at the earliest opportunity. I've also updated the proto.zip archive in the Boost file vault and uploaded the latest docs to: http://boost-sandbox.sourceforge.net/libs/proto/doc/html/index.html Thanks, -- Eric Niebler BoostPro Computing http://www.boostpro.com

1 0

[Serialization] Serialization of a derived template class inheriting from a none template base
by Sebastian.Karlsson＠mmorpgs.org 10 Aug '08

10 Aug '08

Hi, I'm in the process of trying to get boost::any serializable, and it's quite tricky, especially considered my very limited experience with boost::serialize. I googled around and found an old discussion on this very list, and while interesting no resolution seemed to be found which satisfied all the criteria for being commited boost. However, since I'm not as picky with data portability, the solution hinted at in: http://lists.boost.org/boost-users/2005/09/14266.php seems very interesting. The only problem is that I can't see how it would be implemented to solve this problem. It needs to be within the definition of the class to be able for the typename to be in scoop, but since the macro seems to expand to a definition to be placed in the boost namespace I can't seem to get it to play nice. Any solution which lets me automagicaly serialize boost::any which contains serializable types, even if intrusive, would be extremely welcomed.

5 11

warning in bind header
by Isaac Lascasas 10 Aug '08

10 Aug '08

Hello, this is my first post to the Boost Users List. First, I want to present my respect to all the boost lib developers. I have been using boost lib for about two years and it has improved the quality and robustness of my code to points I would have never imagined. Thank you very much. I'm posting this message because I get the following warning in the bind.hpp header from the current trunk with the vc++2008 compiler: c:\code\BoostSVN\boost/bind.hpp(1643) : warning C4180: qualifier applied to function type has no meaning; ignored c:\code\BoostSVN\boost/bind.hpp(1677) : see reference to class template instantiation 'boost::_bi::add_cref<Pm,I>' being compiled with [ Pm=sl::math::vector4<float> (__cdecl sl::pipe_smasher::pipes::build_float4::* )(void), I=1 ] c:\code\sl\pipe_smasher\pipes/build.hpp(106) : see reference to class template instantiation 'boost::_bi::dm_result<Pm,A1>' being compiled with [ Pm=sl::math::vector4f (__cdecl sl::pipe_smasher::pipes::build_float4::* )(void), A1=sl::pipe_smasher::pipes::build_float4 * ] My code looks like this: class build_float4 : public pipe { public: build_float4() { m_pOutput = add_output<vector4f>("Output"); m_pInputX = add_input<float>("x"); m_pInputY = add_input<float>("y"); m_pInputZ = add_input<float>("z"); m_pInputW = add_input<float>("w"); m_pOutput->add_dependency(boost::bind(&build_float4::on_input_change, this), m_pInputX, m_pInputY, m_pInputZ, m_pInputW); } vector4f on_input_change() { return vector4f(**m_pInputX, **m_pInputY, **m_pInputZ, **m_pInputW); } private: output<vector4f>* m_pOutput; input<float>* m_pInputX; input<float>* m_pInputY; input<float>* m_pInputZ; input<float>* m_pInputW; }; Checking the bind.hpp I found the following: template< class M, class T > struct add_cref< M T::*, 1 > { typedef M const & type; }; Maybe I'm doing something wrong or it is just a typo in the bind.hpp? Thank you, Isaac Lascasas

2 1

[multi-array] Performance? Difference from GIL or uBLAS?
by John C. Femiani 09 Aug '08

09 Aug '08

Has anybody measured performance of multi-array? I am considering whether or not to use it, but when I googled multi_array I got a very old, but unresolved, discussion about poor performance measurements in experiments with optimized code that uses multi_array. (http://lists.boost.org/boost-users/2003/07/4423.php) Also, after a rough glance through multi_array and uBLAS it looks like GIL, uBLAS, and multi_array seem to repeat very similar concepts (and seem to use different syntax). Isn't that kind of bad? I have been playing with GIL in the past but now I am scratching my head about these other libraries. -- John

5 22

A few boost::function questions
by Jesse Perla 09 Aug '08

09 Aug '08

Is there any way to get a normal function pointer out of a boost::function (with its state and potential bindings)? I want to have the option of calling existing optimization routines that are not functor aware. And hopefully including Fortran and C functions as well? I imagine that any solution to this would be hacky and potentially slow, but it would be nice to have the option without porting every optimization routine. Also, what is the general consensus on http://www.codeproject.com/KB/cpp/FastDelegate.aspx these days? How much faster is the overhead? From what I read in this link, it is virtually none vs. 20nanoseconds'ish for boost::function. Are there any caveats or reasons not to apply this widely (assuming that I am using only the Intel compiler)? And am I able to hack out a function pointer out of this library? Does using a binding library remove the speed of the fast delegation? Last, I am having a little trouble understanding the "forwarding problem" as a library user. My main use-case is for dynamic programming. I will have a function of 3-4 parameters (an euler equation or bellman iteration). I will bind all but one of the parameters and then run an optimizer over the other one. However, what values are bound will be in a foreach. (i.e. choose a state space, foreach in statespace run optimizer to see policy function choice for each point in the statespace. iterate...) . Is this going to work with these libraries? Is boost::function combined with boost::binding the most semantically correct way to do this? Am I going to run into enormous overhead or the forwarding problem when I do this? Do nested bindings add in linear overhead? Thanks, Jesse

3 2

[boost.function] member function object problem
by Olaf Peter 09 Aug '08

09 Aug '08

Hi, I perform some tests and run into problems. The following code doesn't compile: ---8<--- #include <boost/python.hpp> namespace python = boost::python; struct My { void exec_test() { } }; int main() { Py_Initialize(); boost::function<void (My*)> exec_test = &My::exec_test; //L13 My my; if (python::handle_exception(exec_test(&my))) { if (PyErr_Occurred()) { PyErr_Print(); } } return 0; } --->8--- $ LANG=en g++ -I /usr/include/python2.5 python_embedded.cpp -o python_embedded -l python2.5 -l boost_python python_embedded.cpp: In function 'int main()': python_embedded.cpp:13: error: variable 'boost::function<void ()(My*), std::allocator<void> > exec_test' has initializer but incomplete type but the code snipped from the boost.function doc page works: ---8<--- #include <boost/function.hpp> struct X { void foo() {} }; int main() { boost::function<void (X*)> f = &X::foo; X x; f(&x); } --->8--- I see no difference that matter, what happens here? Thanks, Olaf

2 2

[enable_if] Why any other than lazy?
by Robert Jones 09 Aug '08

09 Aug '08

Boost.EnableIf defines enable_if etc, and goes on to define lazy_enable_if, which the documentation states is for the circumstances and compilers when the non-lazy version would break since the instantiation for which SFINAE should apply is a nested instantiation which is not properly processed by some compilers. What I don't understand is why anyone would wish to use the non-lazy versions, since AFAICS the lazy version will always work. Then the obvious question is why the non-lazy versions exist at all? Thanks, Rob. -- ACCU - Professionalism in programming - http://www.accu.org

2 3

build times and Boost.Function
by gast128 09 Aug '08

09 Aug '08

Dear all, this would be my 3 post on build times and Boost, since we develop a fairly large system (> 3000 classes) and use Boost a lot. Rebuilding the complete system takes about 2 hours on my home pc (DELL P4 2GHz, 512 Mb) and about 1 hour on my pc @ work (DELL G280, P4, ht, 3.0 GHz, 1 Gb memory). We already use precompiled headers and tend to forward declare as much as possible. Using some of the Boost components in headers is just out of the question because of the increased build times: - exposing the Boost.MultiIndex headers in a much used header drammatically increases build times - same argument for <boost/variant.hpp> - including <boost/type_traits.hpp> give also a huge latency However I also notice that Boost.Function does not have an include guard. Boost.Function is used a lot and exposed through a lot of headers in our code (since they often define a callback interface). Adding an include guard myself drops the build time for a test project dramatically if Boost.Function is included recursively: - include guards + pch 0.42 - include guards 0.35 - normally 1.52 Is there a reason that <boost/function.hpp> does not have an include guard? Does it harm when adding one (or using a wrapper around it, i.e. "incboostfunction.h" which has an include guard)? wkr.

6 8

[preprocessor] ADD efficiency / documentation?
by Isaac Dupree 09 Aug '08

09 Aug '08

This documentation is self-contradictory: http://www.boost.org/doc/libs/1_35_0/libs/preprocessor/doc/ref/add.html "This macro is the most efficient when x is less than or equal to y. However, the efficiency gain is not worth actually comparing the two arguments prior to invocation. In other words, x should be the addend that is most likely to be the largest of the two operands." The first sentence says we want (x <= y); the last sentence says we want (x > y). Which is it? :-) -Isaac

2 1

[boost-users] crash of visual studio compiler with boost bind
by Oliver Kania 08 Aug '08

08 Aug '08

Hello, the following code makes the VC++ compiler (VS 2005) crash, but only when I am trying a release build ! The debug builds work fine. std::sort(l_vec.begin(),l_vec.end(),boost::bind(std::less<int>(),boost::bind(&CLayer::GetPrio,_1),boost::bind(&CLayer::GetPrio,_2))); Where CLayer::GetPrio returns an integer. Best regards, Oliver

6 11

[date_time] apparently still unfixed problem
by Ruediger Berlich 08 Aug '08

08 Aug '08

Hi there, from what I can see, neither the trunk nor the release branch of the upcoming 1.36 release have applied a fix to an issue in the date_time library, that was raised twice on the Boost mailing lists (once by Lothar Werzinger, once by me) and also submitted via the bug tracker (#2091). It is currently not possible to compile date_time-based programs with gcc 4.3.1 without applying a (slight) modification to a date_time header. I would assume that the problem appears with other gcc 4.3-compilers as well (at least Fedora Core 9 and OpenSUSE 11 use 4.3.x compilers). Lothar suggested an easy fix which, from what I can see, could not have any side-effects. It suffices to change line 161 of the file <Boost-Root>/boost/date_time/tz_db_base.hpp from typedef dst_adjustment_offsets<time_duration_type> dst_adjustment_offsets; to typedef boost::date_time::dst_adjustment_offsets<time_duration_type> dst_adjustment_offsets; This change will affect two occurances of dst_adjustment_offsets in the same function only. Could this still be applied to the release candidate ? It would help a lot! In any case thanks, Ruediger

1 0

Wrong header in libs/iostreams/src/file_times.cpp
by Mathieu Peyréga 08 Aug '08

08 Aug '08

In 48033 SVN : libs/iostreams/src/file_times.cpp #include <ctime> #include <boost/iostreams/detail/config/windows_posix.hpp> #include <boost/iostreams/detail/file_times.hpp> #include <boost/iostreams/detail/system_failure.hpp> should now be (I guess there was some file renaming) #include <ctime> #include <boost/iostreams/detail/config/windows_posix.hpp> #include <boost/iostreams/detail/file_handle.hpp> #include <boost/iostreams/detail/system_failure.hpp> otherwise iostreams libs do not compile.... regards, Mathieu -- http://www.incub.net/

1 0

[spirit] finish parser from actor
by piotr270977＠interia.pl 08 Aug '08

08 Aug '08

Hi All I have to finish parser with error from actor. Is it possible ? for example: rule<> r = (int_p[do_push] >> *('.' >> int_p[do_push])) [do_act] | ................... | ................... ; How to stop parsing in do_act function and exit parser with error pronounce in parse_info<> ? ---------------------------------------------------------------------- Taniej na zagraniczne komorki! Sprawdz >>> http://link.interia.pl/f1ece

2 1

File Handling
by Ankur Srivastava 08 Aug '08

08 Aug '08

Hi All, I am new to the boost library. I was trying to handle file operation using boost like.. 1- Create a file. 2- Open a file in different modes. 3- Read/write operations on the file with special international character support. I was wondering if anyone have any sample code for the same problem. Please reply at the earliest. Thanks, Ankur

1 0

boost program options - notifier function 0 arguments
by Aljaz 08 Aug '08

08 Aug '08

Hello I've been wondering how its possible to call a notifier function with an option that doesnt require arguments. Something like: po::options_description desc("Allowed options"); desc.add_options() ("help", po::value<>()->notifier(&_help_function), "produce help message"); Whats the proper way of doing this? Many thanks in advance Aljaz

2 1

too many arguments to function ‘boost::fusion::vector
by Peng Yu 08 Aug '08

08 Aug '08

Hi, I got the following error, when I try to define a boost::fusion::vector of many elements. Can somebody let me know how to increase the limit of the number of elements? Thanks, Peng /usr/include/boost/fusion/container/generation/make_vector.hpp|40| error: too many arguments to function 'boost::fusion::vector<boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> boost::fusion::make_vector()'

2 1

Re: [Boost-users] [boost-users] crash of visual studio compiler with boost bind
by Alan M. Carroll 08 Aug '08

08 Aug '08

Shouldn't that _2 be _1? Otherwise, isn't the third argument to the outer bind a binary functor? If so, could that syntax error be the cause of the crash? At 03:59 AM 8/7/2008, you wrote: >Hello, >the following code makes the VC++ compiler (VS 2005) crash, >but only when I am trying a release build ! The debug builds work fine. > >std::sort(l_vec.begin(),l_vec.end(),boost::bind(std::less<int>(),boost::bind(&CLayer::GetPrio,_1),boost::bind(&CLayer::GetPrio,_2)));

2 1

[graph] Is there a way to detect circles in graphs using boost?
by Martin Mann 07 Aug '08

07 Aug '08

Hi, I would like to know if there is an easy/straight-forward way to get all circles of a graph using the boost::graph facilities? And if so where to look or how to do? Thanks a lot, Martin

3 6

[Boost.thread] Simultaneously starting thread execution
by Ruediger Berlich 07 Aug '08

07 Aug '08

Hi there, I'm trying to find a way to let a number of threads start execution simultaneously, and in any case not before a certain condition has come true. I would also like to terminate them within a relatively short time frame. I can not use the Boost.Thread barrier class, as I do not know the number of threads in advance (users register consumer-type objects, and I do not know how many there will be). I also believe I do not have to use a condition variable, as the different threads need to synchronize their access to a data ressource anyway, and I can use the same mutex to block them in the beginning. I have thus come up with something like the code quoted below. Are there easier ways to do this with the Boost.Thread library ? One of the problems (which seems to be unrelated to the code below) is that the three threads do not get called equally often. In one run, one thread was called 14564 times, another 1607 times and the third one 8676 times. Thanks and Best Regards, Ruediger /***********************************************************************/ #include <iostream> #include <boost/cstdint.hpp> #include <boost/bind.hpp> #include <boost/thread/mutex.hpp> #include <boost/thread/condition.hpp> #include <boost/thread/condition_variable.hpp> #include <boost/thread/thread.hpp> using namespace std; class test { public: test() :lock(helloMutex_), jointData_(0), MAXJOINTDATA(10000), thread1(boost::bind(&test::sayHello, this)), thread2(boost::bind(&test::sayHello, this)), thread3(boost::bind(&test::sayHello, this)) { /* nothing */ } void startAndStopThreads(){ lock.unlock(); while(true){ boost::unique_lock<boost::mutex> local_lock(helloMutex_); if(jointData_ >= MAXJOINTDATA){ thread1.interrupt(); thread2.interrupt(); thread3.interrupt(); break; } } thread1.join(); thread2.join(); thread3.join(); } void sayHello(){ for(;;){ if(boost::this_thread::interruption_requested()) break; boost::unique_lock<boost::mutex> local_lock(helloMutex_); std::cout << "Hello world Nr. " << jointData_++ << " from thread " << boost::this_thread::get_id() << std::endl; } } private: boost::mutex helloMutex_; boost::unique_lock<boost::mutex> lock; uint32_t jointData_; const uint32_t MAXJOINTDATA; boost::thread thread1, thread2, thread3; }; main(){ test Test; Test.startAndStopThreads(); std::cout << "Done ..." << std::endl; }

5 7

How to get the port number and the address of a boost::asio::ip::tcp:acceptor object
by Jean-Sebastien Stoezel 07 Aug '08

07 Aug '08

Hi, How to get the port number and ip address of an acceptor? I tried this: boost::asio::ip::tcp::acceptor acceptor(m_IoService); boost::asio::ip::tcp::acceptor myEndPoint(m_IoService); acceptor.get_option(myEndPoint); But this does not compile, Iget a couple of errors in win_iocp_socket_service.hpp like this one: Error 8 error C2039: 'level' : is not a member of 'boost::asio::basic_socket_acceptor<Protocol>' Thanks, Jean

3 3

[filesystem] strange linker error
by Matthias Schabel 07 Aug '08

07 Aug '08

Using the 1.36 beta libs on OS X and linking to libboost_system- gcc40-1_36.a and libboost_filesystem-gcc40-1_36.a I get : "boost::system::error_code::message() const", referenced from: boost::system::system_error::what() constin main_mpi.o boost ::filesystem ::basic_filesystem_error <boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> >::what() constin main_mpi.o ld: symbol(s) not found Any ideas what I'm doing wrong here? Matthias

2 1

Re: [Boost-users] How to get the port number and the address of a boost::asio::ip::tcp:acceptor object
by Jean-Sebastien Stoezel 07 Aug '08

07 Aug '08

Hi, The following code: boost::asio::ip::tcp::acceptor myacceptor(m_IoService); myacceptor.open(boost::asio::ip::tcp::v4()); boost::asio::ip::tcp::endpoint endpoint = myacceptor.local_endpoint(); generates the following exception: "An invalid argument was supplied" when myacceptor.local_endpoint() is invoked. any idea? On 8/7/08, Igor R <boost.lists(a)gmail.com> wrote: > > Then when I do: > > > > boost::asio::ip::tcp::acceptor acceptor(m_IoService); > > > > when I call > > > > boost::asio::ip::tcp::endpoint endpoint = acceptor.local_endpoint(); > > > > I get an exception as follow: > > "The file handle supplied is not valid" > > You have to open() the acceptor: > http://www.boost.org/doc/libs/1_35_0/doc/html/boost_asio/reference/basic_so… >

1 0

about UTF8 to UNICODE
by Ken zhang 07 Aug '08

07 Aug '08

Hello I hava a UTF8 string reading from TinyXML, I want convert to a Unicode string (wchar_t) for some reasons, How can convert it by boost? Thanks Kenneth.Sh

5 5

[Multi-index] how to create 1-n relation between multi index containers?
by Prometheus Prometheus 07 Aug '08

07 Aug '08

hi all a few weeks ago i came across multi index and now im using it very intensively in my linux application (using g++) the problem im facing more often is a situation like this: i have a structure using multi index for server's (for example) typedef struct server{ uint32_t ip,port; std::string hostname; }; and i have a groups structure typedef struct servergroup{ std::string groupname; uint32_t groupid; time_t sometimestamp; uint32_t groupstate; // std::vector<server> members; // << could this be a multi_index? }; what i need to do is create a relation between a group and it's members (servers) and thats what im not sure about how to achive using multi_index the reason for the relationship is that i need to create an index for queries like this: In which group is server X? or Which servers has Group X? The only possibility i see is by creating 1 structure which causes much memory overhead and updating is a bit of a problem, cause i would need a loop for updating the state of the group for every member, ... I also thought about using boost bimap, but im pretty unsure how? So anybody has a hint on this (including maybe a very small example)? im pretty sure its some kind of 'not see the wood for trees' problem thx for ur time _________________________________________________________________ Discover the new Windows Vista http://search.msn.com/results.aspx?q=windows+vista&mkt=en-US&form=QBRE

2 1

boost tokenizer problem with stringstream
by Daryl Lilburn 07 Aug '08

07 Aug '08

Hi, A colleague has recently discovered a problem using tokenizerwith the output from a std::stringstream class in VC8. If we dothe following, we get an "ITERATOR LIST CORRUPTED" exceptionthrown: typedef boost::char_separator<char> Separators;typedef boost::tokenizer<Separators > Tokens; std::string str1("ABC");std::string str2("DEF");std::stringstream oss;oss << str1 << "," << str2; Tokens strList(oss.str(), Separators(",|"));Tokens::const_iterator strIter = strList.begin(); // exception thrown here I thought this might be because the string returned from oss.str() is temporaryso I tried the following change and it still failed: std::string tempStr(oss.str());Tokens strList(tempStr, Separators(",|"));Tokens::const_iterator strIter = strList.begin(); // exception thrown here Finally I tried this and it succeeded. std::string tempStr;oss >> tempStr;Tokens strList(tempStr, Separators(",|"));Tokens::const_iterator strIter = strList.begin(); // exception thrown here Can anyone tell me why the first two (in particular the second option) failed? RegardsDaryl Lilburn _________________________________________________________________ Are you paid what you're worth? Find out: SEEK Salary Centre http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fninemsn%2Eseek%2Ecom%2Eau%2…

2 1

[graph] Is there a way to stop BFS when a certain vertex was visited?
by Martin Mann 07 Aug '08

07 Aug '08

Hi, I am using BFS to find the shortest path between two nodes as suggested in the documentation for unweighted graphs (or all weights == 1). I have written a visitor and can now access a shortest path from the start vertex to the vertex of interest. ==================================================================== My question is: HOW to stop further BFS traversal of the graph? ==================================================================== Is there a possibility e.g. by emptying the vertex queue (e.g. by the visitor)? Or some other, more elegant way to do? Thanks in advance for your help, Martin

2 1

[graph] Bug - add_edge (adjacency_list) does not report if edge already exists as stated in documentation
by Martin Mann 07 Aug '08

07 Aug '08

Hi, I encountered the following problem : a successive call with equal parameters u, v, and g of ============================================================ std::pair<edge_descriptor, bool> add_edge( vertex_descriptor u , vertex_descriptor v , adjacency_list& g ) ============================================================ yields both times "RESULT.second == true". But the documentation states, that only in case it is NOT PRESENT it should be true, which is obviously wrong for the second call. If I use the "edge(u,v,g)" method to check if the edge exists I get the correct result of "edge(u,v,g).second == false" before the first call and "edge(u,v,g).second == true" after the first and before the second call. So the problem is all about the add_edge function and I think it's more a bug than a feature. Because otherwise the bool-flag is obsolete or reports something totally different. Cheers, Martin ============================================================ The boost graph class I use ============================================================ //! The properties available for the nodes of a CoreGraph typedef boost::property< boost::vertex_index_t, size_t , boost::property< boost::vertex_name_t, std::string > > CoreGraph_NodeProperties; //! The properties available for the edges of a CoreGraph typedef boost::property< boost::edge_name_t, std::string > CoreGraph_EdgeProperties; //! The definition of a the internal graph representation typedef boost::adjacency_list< boost::vecS , boost::vecS , boost::undirectedS , CoreGraph_NodeProperties , CoreGraph_EdgeProperties > CoreGraph; ============================================================

2 4

boost::function to member function - "changing the instance of the class".
by Alejandro Martinez 07 Aug '08

07 Aug '08

After i define a boost::function using bind to a member function of some signature... Can i change the instance to have as "this" in such function for another of the same type? Maybe pass it as a parameter at call time? Why would i want that? Imagine i have some class A that dispatches calls for a big amount of methods. The requests for such calls come serialized, and the method is selected by its name (string). So there should be a std::map<std::string, boost::function<some_signature> > to be able to make the actual call after i know what the name is without doing a switch or a huge ammount of ifs. So A has that map, and has it populated with member functions of itself. But i may have many instances of A. (actually, one for each of many threads). So having that map in each is a waste of resources. So maybe i could declare the map as static, so that it is shared between all instances of A. But to do that, i would need to be able to tell the function in the map im about to invoke, what its "this" should be at this time. Did i explain myself clearly? Thanks a lot for your time :)

2 2

boost::asio non-blocking read
by Jean-Sebastien Stoezel 07 Aug '08

07 Aug '08

Hi, While I've been able to implement non-blocking reads on sockets, using boost::asio::read and boost::asio::socket_base::bytes_readable (only reading whern there's data available), I'm having troubles implementing non-blocking reads on serial_port stream object. Any idea how to do? Thanks! Jean

2 1

[spirit] skip parser problem
by piotr270977＠interia.pl 07 Aug '08

07 Aug '08

Hi All I have a problem with spirit skip parser. If parsing text is ending with skiped char (ie. space) the parsing failed returning parse_info.full as false. For example, let's examine code from spirit documentation: http://spirit.sourceforge.net/distrib/spirit_1_8_5/libs/spirit/example/fund… If we parse string like that "B 6,4 ,6, 5" everything is OK, but if we parse "B 6,4 ,6, 5 " (with space at the end) parsing fail. How are you resolving this problem ??? ---------------------------------------------------------------------- Tylko dla detektywow! Konkurs na Smaker.pl Kliknij >>> http://link.interia.pl/f1eb1

2 1

[proto] latest code and docs?
by Markus Werle 07 Aug '08

07 Aug '08

Hi! I am looking for the latest and greatest working version of proto and especially the proto docs in pdf and/or html. Where can I find it and when will it be included into boost? Btw.: Is there a canonical place where accepted libraries can be found *with generated docs*? Actually I have no svn access due to a firewall ... Thanks for any extra support. Markus

4 7

[Graph] depth_first_search and specifying the edge order
by David Walthall 07 Aug '08

07 Aug '08

Hello. I have a graph that I'd like to run a depth first search on. Is it possible to control the order that edges for each node are traversed? I read through the documentation, but I didn't see anything that would do this. Thanks, David

3 4

boost on apple gcc 4.2
by Daniel Oberhoff 07 Aug '08

07 Aug '08

Hi, Has anyone successfully used boost with the "new" apple gcc 4.2? I would like to since gcc42 has openmp, but I cant seem to be able to use boost. I compiled and installed boost with apple gcc 4.2 by directly using bjam with --toolset=darwin-4.2. When I try to use it I get an error (detailed output of gcc below) which hints towards problems with inline assembly. Actually, to get it compiled at all I had to set -fasm-blocks. Am I missing a flag of sorts? Or is it "just" another woe with apple's modified assembler? Daniel error message of gcc4.2 with boost::filesystem: In file included from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base.hpp:32, from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/shared_count.hpp:29, from /opt/boost-gcc4.2/include/boost-1_35/boost/shared_ptr.hpp:28, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem/path.hpp:19, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem/operations.hpp:17, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem.hpp:16, from mmm_fileloader.hpp:12, from mmm_tool_gui.hpp:5, from mmm_tool_gui.cpp:1: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_exchange_and_add(int*, int)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:46: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘void boost::detail::atomic_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:62: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_conditional_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:88: error: expected `)' before ‘:’ token In file included from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base.hpp:32, from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/shared_count.hpp:29, from /opt/boost-gcc4.2/include/boost-1_35/boost/shared_ptr.hpp:28, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem/path.hpp:19, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem/operations.hpp:17, from /opt/boost-gcc4.2/include/boost-1_35/boost/filesystem.hpp:16, from mmm_fileloader.hpp:12, from mmm_tool_gui.hpp:5, from mmm_tool_2.cpp:3: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_exchange_and_add(int*, int)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:46: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘void boost::detail::atomic_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:62: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_conditional_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:88: error: expected `)' before ‘:’ token In file included from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base.hpp:32, from /opt/boost-gcc4.2/include/boost-1_35/boost/detail/shared_count.hpp:29, from /opt/boost-gcc4.2/include/boost-1_35/boost/shared_ptr.hpp:28, from /opt/boost-gcc4.2/include/boost-1_35/boost/archive/shared_ptr_helper.hpp:23, from /opt/boost-gcc4.2/include/boost-1_35/boost/archive/polymorphic_iarchive.hpp:161, from mmm_tool_net.hpp:8, from mmm_tool_net.cpp:1: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_exchange_and_add(int*, int)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:46: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘void boost::detail::atomic_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:62: error: expected `)' before ‘:’ token /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp: In function ‘int boost::detail::atomic_conditional_increment(int*)’: /opt/boost-gcc4.2/include/boost-1_35/boost/detail/sp_counted_base_gcc_x86.hpp:88: error: expected `)' before ‘:’ token

6 6

[boost-users][StateChart] deferring events
by Igor R 06 Aug '08

06 Aug '08

Hello, I noticed that if I declare an event as deferred in a "parent" state (unintentionally), and define the reaction in some "indirect" inner state, then this reaction has no chance to be called. Is this the correct behavior or a bug? Example (pseudo-code): struct Parent : simple_state<..., Inner1> { defer Ev1; //of course, this is unnecessary; but if this an error? if I leave this line, then when we come to Inner1_3, the Ev1 is *not* processed; if I remove this line, everything is ok! }; struct Inner1 { defer Ev1; transit<Ev1to2, Inner2> }; struct Inner1 { defer Ev1; transit<Ev2to3, Inner3> }; struct Inner1 { in_state_reaction<Ev1> }; Thank you.

2 3

BGL: Unable to compile graphviz.cpp
by Rajesh 06 Aug '08

06 Aug '08

Hi, I downloaded boost_1_35_0 and tried to compile graphviz.cpp using the new spirit parser. Any suggestions? Here is the error I got: g++-4.1.2 -I../../../ -fpermissive -ftemplate-depth-128 -DBOOST_GRAPH_READ_GRAPHVIZ_ITERATORS graphviz.cpp /tmp/ccfGYuqq.o: In function `bool boost::read_graphviz<boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, boost::property<boost::vertex_name_t, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::no_property>, boost::property<boost::edge_weight_t, double, boost::no_property>, boost::no_property, boost::listS> >(std::basic_istream<char, std::char_traits<char> >&, boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, boost::property<boost::vertex_name_t, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::no_property>, boost::property<boost::edge_weight_t, double, boost::no_property>, boost::no_property, boost::listS>&, boost::dynamic_properties&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': graphviz.cpp:(.text._ZN5boost13read_graphvizINS_14adjacency_listINS_4vecSES2_NS_11undirectedSENS_8propertyINS_13vertex_name_tESsNS_11no_propertyEEENS4_INS_13edge_weight_tEdS6_EES6_NS_5listSEEEEEbRSiRT_RNS_18dynamic_propertiesERKSs[bool boost::read_graphviz<boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, boost::property<boost::vertex_name_t, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::no_property>, boost::property<boost::edge_weight_t, double, boost::no_property>, boost::no_property, boost::listS> >(std::basic_istream<char, std::char_traits<char> >&, boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, boost::property<boost::vertex_name_t, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::no_property>, boost::property<boost::edge_weight_t, double, boost::no_property>, boost::no_property, boost::listS>&, boost::dynamic_properties&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)]+0x52): undefined reference to `boost::detail::graph::read_graphviz(std::basic_istream<char, std::char_traits<char> >&, boost::detail::graph::mutate_graph&)' collect2: ld returned 1 exit status -- Regards Rajesh

1 1

statechart: Constructors for initial state can't access outermost_context
by Tim Crews 06 Aug '08

06 Aug '08

Hello: I posted last week about a project in which I am creating two instances of the same state machine class, with the two instances running in separate boost threads. I have the threading issues resolved, but now I am having some other trouble. The two instances of the state machine class are differentiated by slightly different constructor parameter values, which are then stored in some state machine member variables. The contained states then access these member variables. Unfortunately, at least for the initial state, the state constructor is unable to access these member variables. (This may also be true of states other than the initial state, but I haven't been able to get that far yet.) Here is some example code that demonstrates the problem: ################################################################ #include <iostream> using namespace std; #include <boost/statechart/state_machine.hpp> #include <boost/statechart/simple_state.hpp> using boost::statechart::state_machine; using boost::statechart::simple_state; struct TopState; struct Machine : state_machine< Machine, TopState > { Machine (int u): unique(u) {} int unique; }; struct TopState : simple_state< TopState, Machine > { TopState(void) { int z = outermost_context().unique; cout << z << endl; } }; int main (int argc, char *argv[]) { Machine machine1(1); Machine machine2(2); machine1.initiate(); } ################################################################ When I run this code, I get the following error message when machine1 is initiated: app: /usr/include/boost/statechart/simple_state.hpp:217: typename Context::inner_context_type::outermost_context_type& boost::statechart::simple_state<MostDerived, Context, InnerInitial, historyMode>::outermost_context() [with MostDerived = TopState, Context = Machine, InnerInitial = boost::mpl::list<mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::statechart::history_mode historyMode = has_no_history]: Assertion `get_pointer( pContext_ ) != 0' failed. It is as if the outermost context doesn't exist yet (or hasn't been fully initialized yet?) when the initial state is entered. Am I doing something wrong? Thank you for your time, Tim Crews GECO, Inc.

2 1

dynamic allocation of boost/numeric/ublas/matrix?
by Ed 06 Aug '08

06 Aug '08

From an example on teh Boost website, I can use matrix as follows: #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/io.hpp> int main () { using namespace boost::numeric::ublas; matrix<double> m (3, 3); for (unsigned i = 0; i < m.size1 (); ++ i) for (unsigned j = 0; j < m.size2 (); ++ j) m (i, j) = 3 * i + j; std::cout << m << std::endl; } But I want to use Boost matrix where I don't know the size at the time the matrix is declared. I want to do something like matrix<double> *m; then later m=new matrix<double> How do I do this? Ed

2 1

Re: [Boost-users] boost 1.35 code completion under Visual Studio 2008
by Roma.. 06 Aug '08

06 Aug '08

> Hmm, seems to work OK for me with VC8-Express, at the risk of stating the > obvious you may need to build the file once and then wait for Intellisense > to update before it becomes available however. > HTH, John. thanks, John! I want to add one more fact - Code completion (Intellisense) does not work properly also under VS2005 (not express). Some boost modules used in code block Intellisense fully. Some other blocks block Intellisense partially (in the current {block}). Hope, somebody knows the solution of this. Currently workaround is to wrap calls to boost library into BoostFuncCallWrapper.h and BoostFuncCallWrapper.cpp module.

3 3

how to know if a type supports comparison operators
by frederic.bron＠alcan.com 06 Aug '08

06 Aug '08

I am looking for a means to know if a type supports comparison operators (<, >, <=, >=). I have looked in Boost.TypeTraits but could not find what I need. F. Bron Avis : Ce message et toute pièce jointe sont la propriété d'Alcan et sont destinés seulement aux personnes ou à l'entité à qui le message est adressé. Si vous avez reçu ce message par erreur, veuillez le détruire et en aviser l'expéditeur par courriel. Si vous n'êtes pas le destinataire du message, vous n'êtes pas autorisé à utiliser, à copier ou à divulguer le contenu du message ou ses pièces jointes en tout ou en partie. Notice: This message and any attachments are the property of Alcan and are intended solely for the named recipients or entity to whom this message is addressed. If you have received this message in error please inform the sender via e-mail and destroy the message. If you are not the intended recipient you are not allowed to use, copy or disclose the contents or attachments in whole or in part.

4 4

Maemo?
by Pau Garcia i Quiles 06 Aug '08

06 Aug '08

Hello, Is Boost available on Maemo (ARM)? -- Pau Garcia i Quiles http://www.elpauer.org (Due to my workload, I may need 10 days to answer)

2 1

Problems with Boost::Python Embedding Tutorials
by Kripken 06 Aug '08

06 Aug '08

Hello, I am unable to get the boost:python embedding tutorials to work. I have the exact same problems as in this unanswered post: http://www.nabble.com/boost.python-embedding-tutorial-doesn%27t-work---td17… Basically, commands like this python::object ignore = python::exec("print len([1,2,3])", main_namespace); fail with Traceback (most recent call last): File "<string>", line 1, in <module> TypeError: 'NoneType' object is unsubscriptable whereas simpler commands like this do work: python::object ignoreme = python::exec(python::str("print 5"), main_namespace); Similar problems occur with eval instead of exec, for some uses the error is instead TypeError: 'NoneType' object does not support item assignment If it's important, I am running Ubuntu 8.04, Python is 2.5.2, Boost is 1.34.1. Thanks in advance for any tips. - Kripken

2 1

boost::asio::read: Is it possible to read directly into a string?
by Jean-Sebastien Stoezel 06 Aug '08

06 Aug '08

Hello, Is it possible to directly read into a string using boost::asio::read? Or do I have to first read into an array of char, then assign it to the string? Thanks! Jean

2 1

[program_options]
by Marcio Paim de Aquino 06 Aug '08

06 Aug '08

Hi, here is the output of one of the example programs from program_options library: paim@notebook:~$ ./first --help Allowed options: --help produce help message --compression arg set compression level I would like to know if there is a way to change "arg" for something else? Thanks Marcio

2 1

[mpi] Any plan for mpi2 IO support ?
by Alain Miniussi 06 Aug '08

06 Aug '08

Hi, I have a code based on MPI uising MPI2 IO to read/writte its data on disk (all mpi procces perform concurrent read/writte on the same file). Boost::mpi does not seems to include whose functionnalities (parralllel IO, views, async ios, basically the stuff described in http://www.mpi-forum.org/docs/mpi-20-html/node171.htm#Node171 ). Is there a plan to support that in the near future ? I had a looks a boost serialization libraries but they do not seems provide whose functionnalities (or did I missed something ?). Thanks, -- Alain Miniussi Equipe CRIMSON Mesocentre de Calcul SIGAMM +33 492 00 30 09 https://crimson.oca.eu

3 3

Error when using the strstr function, help required
by Sean Farrow 06 Aug '08

06 Aug '08

Hi: When using the strstr function I get the following error: error C2440: 'initializing' : cannot convert from 'const char *' to 'char *' What have I do? Can I fix this with a const_cast, if not what is the fix, I'm sure it must be simple! Chers Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3331 (20080806) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

2 1

serialization of vectors somehow odd
by Sebastian Weber 06 Aug '08

06 Aug '08

Hi! I just switched to the new 1.36.0 beta release and was very confused by the new scheme how optimized arrays are handled within archives as I have implemented an HDF5 archive by myself. After a while I found out how to fix it by browsing SVN changesets - is there some documentation about it I overlooked? Well, now I even see that I have to include serialization/vector_135.hpp to avoid this strange item_version tag to appear which distracts my archives. This is fine, but this is a meta-information, wouldn't it be possible to use some BOOST_STRONG_TYPEDEF to inject this item_version variable as some specific meta-type which I can then filter in my archive? Greetings, Sebastian

3 4

boost 1.35 code completion under Visual Studio 2008
by Roma.. 06 Aug '08

06 Aug '08

Hi! I've compiled and now using Boost 1.35 under XpSp2 VS2008 Regex example from "Getting started" was successfully launched. Another example was not launched: http://www.boost.org/doc/libs/1_35_0/libs/regex/doc/html/boost_regex/captur… Error 1 error C2039: 'captures' : is not a member of 'boost::match_results<BidiIterator>' Error 2 error C2228: left of '.size' must have class/struct/union Error 3 error C2039: 'captures' : is not a member of 'boost::match_results<BidiIterator>' Moreover, code completion seems to not work (I mean list of variants does not appear after typing "pat.", where pat is boost::regex) Are there any ideas? Thanks!

2 1

[Boost.Serialization] shared_ptr compile-time error.
by Vjekoslav Brajkovic 06 Aug '08

06 Aug '08

Hi, I receive a compile time error when I try to serialize shared_ptr<string> in my class. Here are the relevant parts of this class: /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 #include <boost/serialization/base_object.hpp> #include <boost/serialization/shared_ptr.hpp> #include <boost/serialization/string.hpp> class chunk_data : public chunk_metadata { public: chunk_data(std::string s); chunk_data( chunk_metadata metadata, boost::shared_ptr<std::string> data_ptr); chunk_data( boost::filesystem::path path, chunk_metadata::cuid_type chunk_id); chunk_data( boost::filesystem::path path, chunk_metadata::cuid_type chunk_id, boost::shared_ptr<std::string> data_ptr); virtual ~chunk_data(); template <typename Archive> void serialize(Archive& ar, const unsigned int version) { boost::serialization::base_object<chunk_metadata>(*this); ar & data_ptr_; } boost::shared_ptr<std::string> data_ptr_; }; /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 And here are the relevant parts from compilation error. invalid application of âsizeofâ to incomplete type âboost::STATIC_ASSERTION_FAILURE<false>â error: âstruct std::basic_string<char, std::char_traits<char>, std::allocator<char> >â has no member named âserializeâ I haven't found any relevant hints about this error neither in the documentation or on the boost mailing list. Also I've attached the compilation log. I would really appreciate any help. -Vjeko

3 6

Re: [Boost-users] MS SDK 2003 Compiler Configuration
by Bob Monat 06 Aug '08

06 Aug '08

2 1

O(1) free in boost::object_pool ?
by Domagoj Babic 05 Aug '08

05 Aug '08

Hi all, I'm considering using boost::object_pool for my project. Reading the code, I found something that is seemingly suboptimal for my application: destroy in boost::object_pool calls object_pool::free, which calls (eventually) simple_segregated_storage::ordered_free. From the code (and documentation), it seems to me that only simple_segregated_storage::malloc_n uses that ordering. In my application, I don't need malloc_n, so the ordering is redundant. My question is: How can I change the default behavior of object_pool so as to use the simple, unordered O(1) free, which just adds the chunk to the beginning of the list of free chunks? I've (of course) read the documentation, but the only relevant sentences are not very clear: "Memory deallocation may be as simple as adding that chunk to the front of the free list, a O(1) operation. However, more complicated uses of Simple Segregated Storage may require a sorted free list, which makes deallocation O(N)." I.e., since I don't need more complicated uses (I guess that's just malloc_n, please correct me if I'm wrong), I'd like O(1) deallocation. Thank you in advance. Kind regards, -- Domagoj Babic http://www.domagoj.info/ http://www.calysto.org/

2 2

Serialization. On to its binary archive format.
by Alejandro Martinez 05 Aug '08

05 Aug '08

Im sorry to bother with this, but im having lots of trouble with this. I was able to serialize and deserialize flawlessly in c++ in the binary archive. But now i need to be able to construct binary payloads from php, and then deserialize them in c++ in the same way. But i have been hex-viewing the binary output of boost::serialization and wasn't able to understand it completely. Is there any guide or general idea to understand such format? Im not sure if i understand the library enough so as to make my own archive format. for example, when i try to serialize something like this: BOOST_CLASS_IMPLEMENTATION(std::vector<std::string>, boost::serialization::object_serializable) void save(const std::vector<std::string>& a) { std::ofstream ofs("caca.txt", std::ios::binary); boost::archive::binary_oarchive oa(ofs, boost::archive::no_header); oa << a; ofs.close(); } int main() { std::vector<std::string> sarr; sarr.push_back("Uno"); sarr.push_back("Dos"); sarr.push_back("Tres"); save(sarr); return 0; } i get: 00000000 03 00 00 00 00 00 00 00 03 00 00 00 55 6E 6F 03 ············Uno· 00000010 00 00 00 44 6F 73 04 00 00 00 54 72 65 73 ···Dos····Tres So that is: 03 00 00 00 means the vector has 3 elements. then 00 00 00 00 i don't know what it is for and then i have 3 times 4 bytes for the length of the string, and then the string. that weird 00 00 00 00 does not happen if i had (for example) a std::vector<int>. and more of that kind of things happen when i try to use derived types. like... class Request { public: virtual void run() = 0; template<class Archive> void serialize(Archive & ar, const unsigned int) { } }; BOOST_CLASS_IMPLEMENTATION(Request, boost::serialization::object_serializable) class Request1 : public Request { public: void run() { std::cout << " | " << ia << " | " << ib << " | " << sname << " | "; for(int i = 0; i < iarr.size(); ++i) std::cout << iarr[i] << " | "; std::cout << std::endl; } template<class Archive> void serialize(Archive & ar, const unsigned int) { ar & boost::serialization::base_object<Request>(*this); ar & ia & ib & sname & iarr; } public: int ia; int ib; std::string sname; std::vector<int> iarr; }; BOOST_CLASS_EXPORT(Request1) BOOST_CLASS_TRACKING(Request1, boost::serialization::track_never) BOOST_CLASS_VERSION(Request1, 0xff) void arrrg(const Request* a) { std::ofstream ofs("caca.txt", std::ios::binary); boost::archive::binary_oarchive oa(ofs, boost::archive::no_header); oa << a; ofs.close(); } int main() { Request1* temp(new Request1); temp->ia = 1; temp->ib = 2; temp->sname = "Omg!"; temp->iarr.push_back(3); temp->iarr.push_back(4); temp->iarr.push_back(5); Request* a(temp); arrrg(a); return 0; } i get: 00000000 00 00 08 00 00 00 52 65 71 75 65 73 74 31 00 FF ··?···Request1·· 00000010 01 00 00 00 02 00 00 00 04 00 00 00 4F 6D 67 21 ?···?···?···Omg! 00000020 03 00 00 00 03 00 00 00 04 00 00 00 05 00 00 00 ?···?···?···?··· So what are the first 2 bytes in zero? Then 08 00 00 00 is the length of the derived type. then 52 65 71 75 65 73 74 31 is the string. then i get another 00 which i don't know what it is. then FF is the version and the rest is just as expected. so it is also weird. but even weirdest if (for example) i make the arrrg function do oa << a; oa << a; instead of just oa << a; then i get: 00000000 00 00 08 00 00 00 52 65 71 75 65 73 74 31 00 FF ··?···Request1·· 00000010 01 00 00 00 02 00 00 00 04 00 00 00 4F 6D 67 21 ?···?···?···Omg! 00000020 03 00 00 00 03 00 00 00 04 00 00 00 05 00 00 00 ?···?···?···?··· 00000030 00 00 01 00 00 00 02 00 00 00 04 00 00 00 4F 6D ··?···?···?···Om 00000040 67 21 03 00 00 00 03 00 00 00 04 00 00 00 05 00 g!?···?···?···?· 00000050 00 00 ·· after the first 05 00 00 00, i would suspect it should come the same object again (as tracking is off!) but i get that 00 00 again first. and then just the data but with no "derived type signature". so how would the deserialization know what is the derived type for the data that follows? Im a little lost here. Id apreciate any help. Thanks a lot in advance. I'll be trying to hack this thing... :S

2 1

A boost::python problem
by lxcypp lxc 05 Aug '08

05 Aug '08

*I abstract the problem below:* t1.cpp: #include <boost/python.hpp> #include <boost/enable_shared_from_this.hpp> #include <boost/shared_ptr.hpp> #include <iostream> #include <string> #include <list> using namespace std; using namespace boost::python; static object mainobj, global; class A : public boost::enable_shared_from_this<A> { public: void test(); }; class X { public: void test(boost::shared_ptr<A> pObj){} }; typedef boost::shared_ptr < A > A_ptr; typedef boost::shared_ptr < X > X_ptr; X_ptr xx; void A::test() { object aa = global[ "aa" ]; A_ptr pa( shared_from_this() ); aa( xx, pa ); } BOOST_PYTHON_MODULE(pythonobject) { class_ <A>("A") .def("test", &A::test) ; class_ <X>("X") .def("test", &X::test) ; register_ptr_to_python <A_ptr>(); register_ptr_to_python <X_ptr>(); } int main() { Py_Initialize(); initpythonobject(); PyRun_SimpleString("import pythonobject"); mainobj = import("__main__"); global=(mainobj.attr("__dict__")); A_ptr a( new A ); X_ptr x( new X ); xx = x; try { exec_file("t1.py", global, global); a->test(); a->test(); a->test(); } catch (error_already_set) { PyErr_Print(); } return 0; } t1.py: #!/usr/bin/python #coding:utf-8 def aa(x,a): x.test( a ) return 1 *after execute t1.cpp , I got this erro info: terminate called after throwing an instance of 'boost::bad_weak_ptr' what(): tr1::bad_weak_ptr When debug the program, I found after first "a->test()" call, a._internal_weak_this.use_count became 0. It's obviously wrong... so the after "a->test()" will cause error. But if change void test(boost::shared_ptr<A> pObj){} to void test(A* pObj){} I got no error. The errror is gone. Will someone explain this prolbem to me? Thank you.*

2 4

MS SDK 2003 Compiler Configuration
by bob＠jerand.com 05 Aug '08

05 Aug '08

2 1

Cross-compiling Boost 1.35.0
by Grant Erickson 05 Aug '08

05 Aug '08

I have been attempting to generate a build environment for boost in which two targets are involved: 1) Native GCC (Whatever the host build system is) 2) DENX ELDK 4.1 (PowerPC 4xx / Linux) With the assumption that (1) and (2) are both GCC-based, I have (1) working well enough. However, the information at: http://lists.boost.org/boost-users/2007/01/24400.php Seems stale for 1.35.0 in that GCC_ROOT_DIRECTORY, GCC and GXX are no longer referenced. My general recipe in my top-level "glue" makefile is as follows, with commands to extract the source, build a link farm, build any objects and install the library: BoostArchive = boost_1_35_0.tar.gz BoostSource = boost_1_35_0 BoostConfigure = $(BuildDirectory)/configure BoostMakefile = $(BuildDirectory)/Makefile BoostUserConfig = $(BuildDirectory)/user-config.jam BoostLibraries = filesystem \ thread BoostLibrariesList = $(subst $(SPACE),$(COMMA),$(strip $(BoostLibraries))) $(BoostSource): $(BoostArchive) tar -zxvf $< $(BoostConfigure): | $(BoostSource) lndir -silent $(CURDIR)/$(BoostSource) $(BuildDirectory) $(BoostMakefile) $(BoostUserConfig): $(BoostConfigure) cd $(BuildDirectory) && \ BJAM_CONFIG="" \ $(BoostConfigure) \ --prefix=$(ResultDirectory) \ --with-toolset=gcc \ --without-icu \ --with-libraries=$(BoostLibrariesList) build: $(BoostMakefile) unset MAKEFLAGS && \ $(MAKE) -C $(BuildDirectory) \ BJAM_CONFIG="" \ all install: unset MAKEFLAGS && \ $(MAKE) -C $(BuildDirectory) \ BJAM_CONFIG="" \ install My suspicion is that there's some new 1.35.0-specific magic to pass via BJAM_CONFIG that allows me to specify the GCC and G++ executables (and longer-term, the OS since that might be cross-compiled too rather than Linux in both cases). Any insights on what that new magic might be? Regards, Grant

2 2

[asio] using with mdns/dns-sd?
by Isaac Dupree 05 Aug '08

05 Aug '08

What I want: a (open-source, OS-portable) way to advertise my game on a local LAN, so local players can play with each other easily ("Zeroconf networking"). It looks like MDNS/DNS-SD is the most sensible choice; but it needs (or greatly benefits from) interfacing with whatever the system is running (e.g. Avahi on Linux, and I guess Bonjour on Mac, and I'm not sure quite how people manage to use it on Windows). My current networking is based on Boost.Asio, which I'm pretty happy with as a socket library (yay! finally learning how to use sockets!). Does this MDNS/DNS-SD need support from Boost.Asio, or else what's a good way to go about using it? Maybe to use Bonjour's interface because Avahi apparently implements a compatibility layer for that? (P.S. Although the actually-asynchronous IO was a little confusing. With my Haskell background, I eventually realized that many of the examples were highly obfuscated versions of lambda functions (continuations) defined within other functions, because C++ doesn't yet support such things.) -Isaac

3 2