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Adjacency lists
by Nouf M. 24 Nov '13

24 Nov '13

Hi, I have two *huge* text file with graph data.. the format of the files are as follows: File 1(vertices): Two field in each line (name + weight) e.g. Dan 5 David 7 Jack 3 File 2(edges): Three fields in each line (name name weight) e.g. Dan David 3 Jack David 1 I would like to store the data in an adjacency list using boost. I have wrote the following code: struct VertexProperties { //std::size_t index; std::string name; int weight; }; struct EdgeProperties { EdgeProperties(const int& w) : weight(w) { } int weight; }; My question, is the above code correct? should I include an index in the VertexProperties (I don't have an index in my graph data)? What is more efficient in the searching (latter on) with or without an index? Thank you...

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R-MAT graphs
by Nouf M. 24 Nov '13

24 Nov '13

Hi, I have recently downloaded Boost… I tried the example in the “getting started” page (Lambda)… it worked which means that the installation is fine… The main purpose of installing Boost is that I want to generate graphs using R-MAT in which I found an example at: http://www.boost.org/doc/libs/1_50_0/libs/graph_parallel/doc/html/scalable_… I copied the example and pasted it in the place of the (Lambda) example to make sure that the project is opened correctly (I’m using visual stdio 2012), however, It did not compile successfully, I received the following error: fatal error C1189: #error : "Parallel BGL files should not be included unless <boost/graph/use_mpi.hpp> has been included" I tried to include <boost/graph/use_mpi.hpp> but with no luck, I received the following error: fatal error C1083: Cannot open include file: 'mpi.h': No such file or directory What should I do? Please help me… Best regards, Nouf

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[Conversion] Ready to turn off write access to svn?
by Beman Dawes 24 Nov '13

24 Nov '13

According to the calendar (http://www.boost.org/community/index.html) it is time to turn off write access to the Subversion repo. Are there any showstoppers? --Beman

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Subversion repository closing. Conversion to Git imminent.
by Beman Dawes 22 Nov '13

22 Nov '13

The Boost Steering Committee has given the final approval for the conversion from Subversion to Git, including the modularization of Boost library repositories. The Subversion repository will be closed for all changes to all branches, including the sandbox, Sunday, November 23 2013, 00:00 hours UTC. That's 8 PM Saturday, US East Coast time, and 5 PM US West Coast time. Please make no svn commits after that time. We will be adding a pre-commit hook that prevents commits, but please do not wait for that becomes active. After svn is closed, the conversion will be run one last time, and then turned off. Then there is a week set aside for final validity checks, testing, and general scurrying around. When that is done, the boostorg repo on GitHub will open for business. If everything goes smoothly, it may take less than a week but if there are glitches it may take longer. --Beman

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milliseconds UTC from discrete year, month, day, hour, minute, second
by Victor Yankee 22 Nov '13

22 Nov '13

Hello, Can someone should me how to calculate the milliseconds since jan 1, 1970 in UTC, given separate variables holding the year, month,day,hour,minute and seconds? Thanks,

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[MPL] Reason for mpl::quote's name
by Louis Dionne 22 Nov '13

22 Nov '13

Hi, I was just wondering about the origin of the `mpl::quote` metafunction class. Why was this name chosen? Thanks, Louis Dionne

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[Boost-build] Android tests run
by Antony Polukhin 22 Nov '13

22 Nov '13

Hi all, With help of Steven Watanabe, Vladimir Prus and Boost-for-Android project, I've finally run the regression tests on Android ARM. Results can be already seen on the regression test page for trunk. Here is a description of some common issues that can be seen in regression tests results: "arm-linux-androideabi/bin/ld.exe: error: cannot find -lrt" Some of the Android libraries (for example librt) are merged with libc. Some patches to b2 required not to add -lrt fot the platform. "soinfo_link_image(linker.cpp:1635): could not load library "libboost_unit_test_framework-gcc-d-1_55.so.1.55.0" needed by "./copy_if_test1"; caused by load_library(linker.cpp:745): library "libboost_unit_test_framework-gcc-d-1_55.so.1.55.0" not found" This is because of cross compilation - tests are compiled in Win and then copied to the emulator. This is an error in my copying script that will be fixed someday. Also please note, that sources are compiled with -DBOOST_ASIO_DISABLE_STD_ATOMIC and -DBOOST_AC_USE_PTHREADS because there are some issues with std::atomic on android (See https://code.google.com/p/android/issues/detail?id=42735#makechanges ) This must be possibly added to the config of the libraries by default. Some hints: * You can check for android platform in your code using defined(__ANDROID__). * __ANDROID__ can run on different hardware, so do not assume that it will be always ARM. * Having problems with Jamfile and cross compilation? Use <target-os> instead of <host-os> in your jamfiles. * Boost-for-Android project ( https://github.com/MysticTreeGames/Boost-for-Android) may contain some useful fixes for your library. Author of the library "would love" to see the issues integrated, see discussion at https://github.com/MysticTreeGames/Boost-for-Android/pull/15 This letter is cc'ed to the boost-build because of: * "-lrt" issues * Is there a way to install/call_script for all the boost libraries before running the regression tests? * specifying "<threadapi>pthread" in user-config.jam does not work -- Best regards, Antony Polukhin

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[chrono] boost::chrono::floor() and negative durations
by Krzysztof Czainski 22 Nov '13

22 Nov '13

Hello, The function boost::chrono::floor() is documented: "This function round down the given parameter." Therefore I expect the assert in the following program to pass, but it fails: #include <boost/chrono/floor.hpp> #include <cassert> int main() { boost::chrono::nanoseconds const nsec( -1 ); boost::chrono::seconds const sec = boost::chrono::floor<boost::chrono::seconds>(nsec); assert( sec.count() == -1 ); } Is this intended behavior? If yes, could the docs be updated to clarify this? Regards, Kris

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Fwd: Ask for a solution regarding to the function intersection() in boost geometry
by Jun Zhang 21 Nov '13

21 Nov '13

Dear Sir/Madam, Many thanks for your work on boost library. I am a user of the library. But now I meet a problem regarding to the function intersection. Could you please see the attached file. When I get the intersection of the polygon "red" and "blue" with the function, the output is the "green" (only one polygon). However, "green" should be two polygons. And if the green is regarded as one polygon, there is some error to get the intersection of it with others. That means I cannot calculate the intersection of "green" and "blue" with intersection(). The error is as following: This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. terminate called after throwing an instance of 'boost::geometry::overlay_invalid_input_exception' what(): Boost.Geometry Overlay invalid input exception All the best -- Dr.-Ing. Jun Zhang Jülich Supercomputing Centre Institute for Advanced Simulation phone +49 2461 61 1995 E-Mail: ju.zhang(a)fz-juelich.de<mailto:ju.zhang@fz-juelich.de> Internet: http://www.fz-juelich.de/ias/jsc ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------

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Problems building boost.python against python 3.x on Windows
by Fredrik Orderud 21 Nov '13

21 Nov '13

There seem to be a problem building boost.python against python 3.x on Windows. Steps to reproduce: * Download & unzip boost 1.55 * bootstrap.bat * set PYTHONHOME=C:\Python33 * b2 link=shared runtime-link=shared toolset=msvc-11.0 b2 will then output the following: --- warning: No python installation configured and autoconfiguration note: failed. See http://www.boost.org/libs/python/doc/building.html --- This does not happen if building against Python 2.7 with set PYTHONHOME=C:\Python27. I suspect that the reason is due to tools\build\v2\engine\build.jam only containing logic for python 2.2-2.7. Could anyone please look into this? Thanks in advance, Fredrik

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