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[range/iterator] operator[] forwarding
by Shunsuke Sogame 12 Oct '06

12 Oct '06

Hi gurus, under RC_1_34, #include <boost/range.hpp> #include <boost/iterator/counting_iterator.hpp> int main() { boost::make_iterator_range( boost::make_counting_iterator(0), boost::make_counting_iterator(5) )[2]; } VC++7.1 and GCC3.4 says a warning something like "returning address of local variable or temporary". counting_iterator is implemented by iterator_facade, whose operator[] returns *value*. In fact, the result type of iterator_facade's operator[] seems unspecified. Is it possible to do forwarding of iterator's operator[], which is tried by iterator_range? -- Shunsuke Sogame

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GIL Review: Use of concept syntax for documentation
by Lubomir Bourdev 12 Oct '06

12 Oct '06

GIL's way of documenting concepts has been a hot topic for discussion, so let me share our thoughts on it. Our current documentation is in this form because we believe it is more intuitive and we hope some related version of it will make it into the standard. As part of ASL we have no requirement to use the old style. Given the size of the library, we feel it will be too much wasted work to change the design just for the boost review, in case the library does not make it into boost. That said, if there is a strong consensus that as a condition for acceptance GIL must switch to the old-style concept documentation, we will change it. We prefer the opposite - to update the GIL documentation to comply with the very latest draft of the proposal. Lubomir

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GIL - Generic Image Library Review - Begins October 5
by Tom Brinkman 12 Oct '06

12 Oct '06

With the last finishing touches completed, i'm excited to be able to announce that the review of Generic Image Library (GIL) will begin October 5, in three days. Please download the library at: http://opensource.adobe.com/gil.<http://opensource.adobe.com/gil> This site has a great deal of background information about the library, so be shur to check it out. A quick summary follows: The Generic Image Library (GIL) is a C++ library that abstracts the image representation from operations on images. It allows for writing the image processing algorithm once and having it work for images in any color space, channel depth and pixel organization, or even synthetic images, without compromising the performance. GIL has an extension mechanism that allows for adding extra functionality. Two extensions are currently provided – one for image I/O and one for handling images whose properties are specified at run-time. A 55 minute Breeze presentation describing is available at: http://opensource.adobe.com/gil/presentation/index.htm A tutorial is available at: http://opensource.adobe.com/gil/gil_tutorial.pdf A design guide is availage at: http://opensource.adobe.com/gil/gil_design_guide.pdf Tom Brinkman Review Manager

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spirit question
by Aljaz 12 Oct '06

12 Oct '06

Hello again.. I decided to go for Spirit to solve my problem (replacing $variable in string), and I made my own grammar to parse the string.. Now the problems that I have to face with and have no idea how to solve them: 1st) there should be keywords in the grammar/scanner class from some vector <string> which is outside the scanner class that scanner should look for (to be used with definition).. I have no idea what would be the right way to pass/give/read them from scanner class 2nd) when I find a match with scanner class I call [function(self.matched)].. How to pass 2 arguments or more? For instance I will have to pass 3 arguments from $random(1,2,3) + variable name.. so call_some_func("random", 1, 2, 3); How should I solve that? Maybe any example available? Thanks a lot for help Kind regards

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[mpl] BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS Problems
by Jared McIntyre 12 Oct '06

12 Oct '06

I have an extremely large mpl::map who's size doesn't fit in the pre defined map files. I'm trying to get mpl to process the map without using the preprocessed file. I've added a BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS define to the atdafx and a BOOST_MPL_LIMIT_MAP_SIZE where map is defined. It continues to want to use the file associated with BOOST_MPL_LIMIT_MAP_SIZE. BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS is definitely being defined before any mpl header files are loaded. Any thoughts? This is Boost 1.33.0 if that makes any difference. The attempt to load the file is on line 36 of map.hpp. Jared

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[Boost-bugs] [ boost-Bugs-1576175 ] directory_iterator doesn't work with catch
by SourceForge.net 12 Oct '06

12 Oct '06

Bugs item #1576175, was opened at 2006-10-12 13:12 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1576175&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: filesystem Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Beman Dawes (beman_dawes) Summary: directory_iterator doesn't work with catch Initial Comment: Fedora Core 4, gcc version 4.0.2 20051125 (Red Hat 4.0.2-8) The next construction doesn't work (but it works if directory_iterator is changed to some other iterator or just counter): path dir_path(dir_name); directory_iterator end_itr; try { for (directory_iterator itr(dir_name); itr!=end_itr; ++itr) { try { ...... } catch (...) { cout<<"First catch"<<endl; throw 20; } } } catch (...) { cout<<"Second catch"<<endl; } Result: First catch and stucked program, "strace" shows: "futex(0x...,FUTEX_WAIT,2,NULL". ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1576175&group_… ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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GIL Review: Sample code
by Lubomir Bourdev 12 Oct '06

12 Oct '06

Several people suggested to me in email that I should post some GIL sample code, so they get a feel of what GIL is like. My biggest recommendation: If you write a review, please spend an hour to watch the GIL video presentation. That will give you a better feel for GIL. You can also get extra sample GIL code snippets here: - in the tutorial (the Mandelbrot view section is not in the video) - section 15 of the design guide - http://opensource.adobe.com/gil/gil_sample_code.cpp - http://opensource.adobe.com/gil/numeric_example.cpp - http://opensource.adobe.com/gil/html/beforeafterexample.html Here are a few more: // To fill a view with blue template <typename View> void fill_blue(const View& view) { typename View::pixel_t blue; color_convert(rgb8_pixel_t(0,0,255),blue); fill_pixels(view,blue); } // To fill the top left quadrant of the image with blue void fill_blue_quadrant() { rgb8_image_t img; jpeg_read_image("test.jpg",img); fill_blue(subimage_view(view(img),0,0,img.width()/2, img.height()/2)); jpeg_write_view("blue_box.jpg",const_view(img)); } // Find the location of the grayscale pixel with highest magnitude // (or the first in a top-bottom left-right traversal, if multiple) template <typename GView> // Models Grayscale View typename GView::point_t max_gray_channel_coords(const GView& view) { assert(view.size()>0); typename GView::difference_type index = std::max_element(view.begin(),view.end()) - view.begin(); return typename GView::point_t(index % view.width(), index / view.width()); } // Find the location of the highest-intensity pixel in the view template <typename View> // Models ImageViewConcept typename View::point_t max_intensity_coords(const View& view) { return max_gray_channel_coords(color_converted_view<gray32f_pixel_t>(view)); } // Find the location in the grayscale view with the largest horizontal gradient magnitude template <typename GView> // Models grayscale image view typename GView::point_t max_gray_xgradient_coords(const GView& src) { typedef typename GView::channel_t channel_t; // the type of a grayscale image with the same channel as src typedef typename image_type<channel_t, gray_t>::type grad_image_t; // create a temp image of the same size as src grad_image_t buffer(get_dimensions(src)); // clear it (our sample x_gradient code doesn't touch the first and last column) fill_pixels(view(buffer),channel_t(0)); // call the generic x_gradient (see the tutorial for the code) x_gradient(src, view(buffer)); return max_gray_channel_coords(const_view(buffer)); } void test_max_gradient() { typedef point2<std::ptrdiff_t> point_t; rgb8_planar_image_t img; jpeg_read_image("test.jpg",img); point_t coords = max_gray_xgradient_coords(nth_channel_view(const_view(img),0)); cout << "Largest horizontal gradient of the RED CHANNEL: ("<<coords.x<<","<<coords.y<<")\n"; coords = max_gray_xgradient_coords(color_converted_view<gray32f_pixel_t>(const_vi ew(img))); cout << "Largest horizontal gradient of the LUMINOSITY: ("<<coords.x<<","<<coords.y<<")\n"; } Of course, the above functions like fill_blue, max_intensity_coords are fully generic. They work with images in any color space, any channel depth, interleaved and planar. Putting them in function objects will make them work for images with run-time specified types. Lubomir

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Cross compiling boost
by Bartosz Marcinkiewicz 12 Oct '06

12 Oct '06

Hello, I would like to cross-compile boost for XScale based system. Has anybody done this? I need to redefine commands: gcc, g++, ar, ld, as, strip, objdump, etc.. so during build process are executed commands from producer-provided toolchain (this is gcc-3.3.2 that produces binaries for XScale). Thankyou for any help, references to appropriate documentation are welcome. Best regards, bma.

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spirit question
by Aljaz 12 Oct '06

12 Oct '06

Hello again.. I decided to go for Spirit to solve my problem (replacing $variable in string), and I made my own grammar to parse the string.. Now the problems that I have to face with and have no idea how to solve them: 1st) there should be keywords in the grammar/scanner class from some vector <string> which is outside the scanner class that scanner should look for (to be used with definition).. I have no idea what would be the right way to pass/give/read them from scanner class 2nd) when I find a match with scanner class I call [function(self.matched)].. How to pass 2 arguments or more? For instance I will have to pass 3 arguments from $random(1,2,3) + variable name.. so call_some_func("random", 1, 2, 3); How should I solve that? Maybe any example available? Thanks a lot for help Kind regards

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boost::spirit problems
by Aljaz 12 Oct '06

12 Oct '06

Hello again.. I decided to go for Spirit to solve my problem (replacing $variable in string), and I made my own grammar to parse the string.. Now the problems that I have to face with and have no idea how to solve them: 1st) there should be keywords in the grammar/scanner class from some vector <string> which is outside the scanner class that scanner should look for (to be used with definition).. I have no idea what would be the right way to pass/give/read them from scanner class 2nd) when I find a match with scanner class I call [function(self.matched)].. How to pass 2 arguments or more? For instance I will have to pass 3 arguments from $random(1,2,3) + variable name.. so call_some_func("random", 1, 2, 3); How should I solve that? Maybe any example available? Thanks a lot for help Kind regards

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