April 2007 - Boost - lists.preview.boost.org

Fixed point arithmetic - any interest?
by Phil Endecott 24 Apr '07

24 Apr '07

Dear All, I have recently written some code for fixed point arithmetic which I would be happy to contribute to Boost, if it is considered worthy. Please let me know if this is something that you would use, especially if you would be able to help with testing on platforms other than Linux and other tasks necessary for Boostification. Here's a very quick summary: You declare a fixed-point variable by specifying the number of whole-number bits and the number of fraction bits, e.g. fixed<8,23> x; This has a range of about -256 to +256 with a precision of 1/(2^23), and occupies 32 bits. boost::integer is used to choose an implementation type with sufficient bits. The usual arithmetic operators are implemented with some help from boost::operators, and should have no overhead; note that overflow is not detected (like the built-in integral types). Implicit conversions are provided to and from the built-in integral and floating-point types (well, actually I have only added the ones that I have needed; the others should only need copy&paste). Implicit conversion between fixed types of different sizes is also possible. I'm starting to think that perhaps I should make some of these conversion explicit: I worry that code using this might be doing an "invisible" conversion via a floating point type that I didn't want. Any thoughts about this would be appreciated. Operations between fixed-point values of different sizes are possible, and return a fixed-point value with sufficient bits to store the result. For example: fixed<10,4> a; fixed<15,2> b; fixed<15,4> c; c = a + b; ..except that actually one more bit is needed in the maximum-value case. There are no doubt more opportunities for refinement in this area. You can see the code here: http://svn.chezphil.org/libpbe/trunk/include/fixed.hh Thanks for your attention. Phil.

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proto::or_ arity
by Maurizio Vitale 23 Apr '07

23 Apr '07

proto::or_ (and I presume, but not verified, proto::and_) requires at least 2 arguments. It might be nice to allow 1 argument (and maybe 0 arguments as well). Zero and one can happen while playing around during development, but more importantly as the result of invoking other metafunctions computing grammars. Whether it is really an issue in practice, I cannot tell. For now I've hit this in the 'playing around' part, haven't needed to compute grammars yet. At least with GCC, the error you presently get when you try proto::or_ with one argument is that it requires 8 arguments, with no indication that anything between 2 and 8 would work. Arguably GCC error messages could be improved to take into consideration default aruments, but this is what 4.1.2 does. Best regards, Maurizio

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creating a threadsafe singleton class
by Clark Sims 23 Apr '07

23 Apr '07

http://acumenconsultinginc.net/TechNotes/ThreadSafe/ I used the boost scoped_lock, and shared_ptr classes, to create 2 template classes which provide threadsafe access to a singleton class. I also included the example of a singleton class which has a destructor. --------------------------------- Ahhh...imagining that irresistible "new car" smell? Check outnew cars at Yahoo! Autos.

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Boost inspection notification (2007-04-23/RC_1_34_0) *X*
by Rene Rivera 23 Apr '07

23 Apr '07

Boost Inspection Report Run Date: 16:05:51 UTC, Monday 23 April 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11450 files scanned 908 directories scanned (including root) 198 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 107 broken links 21 unlinked files 22 file/directory names issues 1 files with tabs 9 violations of the Boost min/max guidelines 35 usages of unnamed namespaces in headers (including .ipp files) Summary: archive (3) bind (1) boost-root (3) build (1) date_time (1) doc (2) filesystem (37) graph (2) iostreams (3) lambda (3) math (8) more (1) mpl (4) multi_array (2) ptr_container (1) python (10) regex (1) regression (32) serialization (1) test (81) type_traits (1) Details: *R* invalid (cr only) line-ending *A* invalid bookmarks, invalid urls, broken links, unlinked files *N* file/directory names issues *T* tabs in file *M* uses of min or max that have not been protected from the min/max macros, or unallowed #undef-s *U* unnamed namespace in header |archive| 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Boost inspection notification (2007-04-23/RC_1_34_0) *LC*
by Rene Rivera 23 Apr '07

23 Apr '07

Boost Inspection Report Run Date: 16:05:58 UTC, Monday 23 April 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11450 files scanned 908 directories scanned (including root) 1051 problems reported Problem counts: 653 files missing Boost license info or having wrong reference text 398 files missing copyright notice Summary: any (1) archive (1) build (68) concept_check (22) conversion (5) doc (1) filesystem (2) function (1) graph (1) inspect (1) integer (9) lambda (10) libs (6) logic (2) math (1) more (13) mpl (417) multi_array (13) numeric (188) optional (1) people (4) program_options (35) property_map (15) ptr_container (8) python (6) rational (5) regex (4) regression (118) release (2) serialization (16) signals (2) smart_ptr (8) test (3) timer (1) tr1 (2) tuple (5) utility (12) variant (42) Details: *L* missing Boost license info, or wrong reference text *C* missing copyright notice |any| libs/any/doc/ any.xml: *L* |archive| boost/archive/detail/ utf8_codecvt_facet.hpp: *L* |build| tools/build/v2/build/ build-request.jam: *L* modifiers.jam: *L* tools/build/v2/doc/ Jamfile.v2: *C* *L* tools/build/v2/doc/src/ advanced.xml: *C* *L* architecture.xml: *C* *L* catalog.xml: *C* *L* extending.xml: *C* *L* faq.xml: *C* *L* fragments.xml: *C* *L* howto.xml: *C* *L* install.xml: *C* *L* recipes.xml: *C* *L* reference.xml: *C* *L* standalone.xml: *C* *L* tutorial.xml: *C* *L* userman.xml: *C* *L* tools/build/v2/example/generate/ REAME.txt: *C* *L* a.cpp: *C* *L* tools/build/v2/example/generator/ README.txt: *C* *L* soap.jam: *C* *L* tools/build/v2/example/python_modules/ python_helpers.jam: *C* *L* python_helpers.py: *C* *L* tools/build/v2/test/ abs_workdir.py: *C* *L* dependency_property.py: *L* dependency_test.py: *C* *L* direct_request_test.py: *C* *L* dll_path.py: *L* double_loading.py: *L* duplicate.py: *L* echo_args.jam: *C* *L* empty.jam: *C* *L* expansion.py: *L* explicit.py: *L* gcc_runtime.py: *L* tools/build/v2/test/project-test3/lib3/ Jamfile: *C* *L* tools/build/v2/test/ readme.txt: *C* *L* svn_tree.py: *L* tag.py: *L* test_system.html: *L* tools/build/v2/tools/ 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[Report] 1 regressions on RC_1_34_0 (2007-04-19)
by Douglas Gregor 23 Apr '07

23 Apr '07

Boost Regression test failures Report time: 2007-04-19T04:27:14Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-RC_1_34_0/developer/i… 1 failures in 1 libraries graph (1) |graph| adj_list_cc: gcc-cygwin-3.4.4

3 2

[Report] 1 regressions on RC_1_34_0 (2007-04-23)
by Douglas Gregor 23 Apr '07

23 Apr '07

Boost Regression test failures Report time: 2007-04-23T00:53:18Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-RC_1_34_0/developer/i… 1 failures in 1 libraries graph (1) |graph| adj_list_cc: gcc-cygwin-3.4.4

1 0

[1.34.0] www.boost.org RC_1_34_0 regressions
by Thomas Witt 23 Apr '07

23 Apr '07

Hi, Could whoever removed the link to the RC_1_34_0 regressions from the web-page please put it back. Thanks Thomas -- I'm trying a new usenet client for Mac, Nemo OS X. You can download it at http://www.malcom-mac.com/nemo

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CERN project is using Boost
by Shams 23 Apr '07

23 Apr '07

Hi, Maybe a good addition to Who's using Boost. http://seal.web.cern.ch/seal/main/components.html Thanks Shams --

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Summer of Code rapid prototype: "Visualization of STL Containers"
by Jake Voytko 23 Apr '07

23 Apr '07

Greetings, Boost! I've been in the application process for Google's "Summer of Code", and John Maddock brought up the idea of rapid prototyping in order to start finalizing design ideas. Over a couple of days I worked out a rough sketch of how the user interface would be organized. The "Initial Proposal" below has a detailed description of what the project is about, but the rough idea is that I need to visualize data in STL containers using the SVG (Scalable Vector Graphics) format. The sample code provided uses std::vector<double> containers currently, and I will extend the idea to generic STL containers during the summer. Dr. Maddock had the idea that the class could use a stream-like interface, sampled below. svg_graph my_graph("file.svg"); my_graph<<x_scale(-10, 10)<<y_scale(-10, 10); my_graph<<plot_range(my_cont.begin(), my_cont.end()); I have the basic idea of streams working, but I haven't yet implemented multiple streams working in conjunction (as in line 2). Again, this is a rapid prototype that I squeezed in between schoolwork! I intend the main bulk of the work to be done during the summer, and I feel that I still need to do some refactoring of the code. I am looking for suggestions of directions people would like to see this project go. What would you like to customize in the output? Do you have a better idea for an interface? Am I taking the implementation in the wrong direction? How would you like invalid data to appear? Not at all? As a gray dot on an axis? I'd like to get a conversation going about what the user should/should not be able to do with this. Initial Proposal: http://www.tcnj.edu/~voytko2/proposal.txt Suggestions by mentors: http://www.tcnj.edu/~voytko2/suggestions.txt Zip file of code: http://www.tcnj.edu/~voytko2/svg.zip Output of sample code: http://www.tcnj.edu/~voytko2/first.svg The code compiles in both MS Visual Studio 8.0 and g++ 4.0.3. Thank you for your time, Jacob Voytko

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