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

[sorting] How radixsort is useful
by Sam Schetterer 17 Mar '07

17 Mar '07

Many people are asking me how radixsort is useful. Well, I have just posted a program that does what is called a "sort within sort". It sorts a class containing an int array. The classes are first sorted by the first int in the array, and then the second. They are then outputed to the standard output in proper order. I also wrote an operator< to show how much slower that function is than operator[] for a "sort within sort". Also, if you have other ideas or questions about radix sort and radix quicksort, post them and I will write a sample program showing how radixsort and radix quicksort are useful for that purpose.

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Re: [boost] Anyone downloaded the sorting library from vault?
by Sam Schetterer 17 Mar '07

17 Mar '07

Many people are asking me why radixsort is useful. Well, I have just posted a program that does what is called a "sort within sort". It sorts a class containing an int array. The classes are first sorted by the first int in the array, and then the second. Theya re then outputed to the standard output in proper order. I also wrote an operator< to show how much slower that function is than operator[]

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GSoC
by Lakshan Perera 17 Mar '07

17 Mar '07

Hi All, I'm Lakshan, 20 year old undergrad from Sri Lanka, I would like to give a shot at creating BOOST community web site. So what sought of areas and features should my project proposal should touch into ? For a start I would like to base my solution on Drupal CMS. Regards, Lakshan.

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[sorting] More new vault files
by Sam Schetterer 17 Mar '07

17 Mar '07

Hi. Sorry, but I uploaded new files to vault, and the radix_sort has been extrememly imporved by a huge extent, and radix_quicksort has been improved too, but not to such a large extent. Mainly, for radixsort, I added support for random access iterators and support for users to pass their own functions. I also added the user-functions to radix_quicksort, but ahve not yet implemented iterators for that.

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Re: [boost] Anyone downloaded the sorting library from vault?
by Sam Schetterer 17 Mar '07

17 Mar '07

On March 16, Lewis Hyatt wrote I took a look at it. Some of my thoughts: -You should provide random access iterator interfaces, not just a bare pointer. -Your docs say you require T to be an integral type or have operator< defined, I think you meant to say "built-in arithmetic type" or something similar. You should also let the user provide their own comparison functor instead of requiring them to overload operator< -Based on your descriptions, it looks like merge_sort is the same as std::stable_sort and quicksort is the same as std::sort, more or less. (Except the standard functions have more generic interfaces). What advantage are they supposed to have over the standard functions? I tried some timings, and found that for both ints and doubles, on my system, your quicksort is about 50% slower than std::sort, and your mergesort is about 5% faster than std::stable_sort, at least for the case of already-sorted data. -It might make more sense to focus on radix sort, since that is not already offered in the standard library... Are you sure about the quicksort speed difference? That seems like a huge difference. Did you have inlining enabled? Also, the current versions are not the final forms. I am implementing random-access iterators and user-provided functions.

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intrusive containers review
by Cory Nelson 17 Mar '07

17 Mar '07

> What is your evaluation of the design? Very good. It was a pleasure to use. I have long wanted an easy way to apply C techniques in a true to C++ style, and this nails it. > What is your evaluation of the implementation? I did not review the r/b tree, but everything else seemed well written. > What is your evaluation of the documentation? I found documentation lacking. I would like to see full class references: it took me a bit of hunting to find a commonly used function container::current() which was very frustrating. > What is your evaluation of the potential usefulness of the library? I believe this is very useful for implementing complex data structures that must be memory efficient, or require knowing the exact size of their data. > Did you try to use the library? With what compiler? Did you have any problems? Yes, tested with VC++ 2005 SP1, on x86 and x64. No problems. > How much effort did you put into your evaluation? A glance? A quick reading? > In-depth study? In depth, other than the r/b tree. I reviewed the implementation and built several benefiting data structures using it to get a full feel for the library. > Are you knowledgeable about the problem domain? Sure. > And finally, every review should answer this question: > Do you think the library should be accepted as a Boost library? Absolutely, I vote to accept. -- Cory Nelson

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Boost inspection notification (2007-03-17/RC_1_34_0) *X*
by Rene Rivera 17 Mar '07

17 Mar '07

Boost Inspection Report Run Date: 16:06:04 UTC, Saturday 17 March 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: 11447 files scanned 908 directories scanned (including root) 196 problems reported Problem counts: 1 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 104 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 (2) date_time (1) doc (2) filesystem (37) graph (2) iostreams (3) lambda (3) math (8) more (1) mpl (1) 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 (2007-03-17/RC_1_34_0) *LC*
by Rene Rivera 17 Mar '07

17 Mar '07

Boost Inspection Report Run Date: 16:06:11 UTC, Saturday 17 March 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: 11447 files scanned 908 directories scanned (including root) 1053 problems reported Problem counts: 654 files missing Boost license info or having wrong reference text 399 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 (419) 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* 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[Report] 36 regressions on RC_1_34_0 (2007-03-17)
by Douglas Gregor 17 Mar '07

17 Mar '07

Boost Regression test failures Report time: 2007-03-17T04:53:32Z 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… 36 failures in 4 libraries iostreams (6) optional (6) parameter (1) python (23) |iostreams| bzip2_test: msvc-7.1 msvc-8.0 gzip_test: msvc-7.1 msvc-8.0 zlib_test: msvc-7.1 msvc-8.0 |optional| optional_test: msvc-6.5 msvc-6.5 msvc-6.5_stlport4 msvc-7.0 optional_test_ref_fail2: msvc-7.1 msvc-8.0 |parameter| python_test: gcc-cygwin-3.4.4 |python| builtin_converters: gcc-3.4.5_linux gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 import_: cw-9.4 gcc-mingw-3.4.2 gcc-mingw-3.4.5 intel-vc71-win-9.1 msvc-6.5 msvc-6.5 msvc-6.5_stlport4 msvc-7.0 msvc-7.1 msvc-7.1 msvc-7.1 msvc-7.1_stlport4 msvc-8.0 msvc-8.0 msvc-8.0 map_indexing_suite: gcc-3.4.5_linux gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64

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Re: [boost] Taking away quicksort and mergesort
by Sam Schetterer 17 Mar '07

17 Mar '07

On March 17, Herve Bronimamm wrote >Sam: the Stl already implements sorting (stable and not), inplace and partial sorting (uses heapsort), nth_element >(generalized median), functors and iterators (generic interface). As far as I can tell, your library has no added value, >except you claim performance. I think you might badly underestimate the effort that goes into implementing the >C++ std library. The only reason someone would consider using your library over the standard library would be if >you could convincingly and reproducingly show that you are faster (and by more than a small percentage). I haven't >seen numbers. >I looked at your code and I see that you're using unguarded recursion in quicksort (check Valois's introspective sort >revisited, published in software practice and experience, 2000), swap in insertion sort, int instead of ptrdiff_t (you're >going to have a bad surprise sorting 2 billion integers on a 64bit platform), etc. My experiences showed that radix >sort was not faster than quicksort, due to the random access pattern (for large arrays) and overhead of counters (for >small arrays). And I have some doubts about the endianness (did you test on both big and small endian >platforms?). That's a lot of comments. I'll leave it at that. Cheers, Herve Well, Herve, you ask why my radixsort is better than std::sort and std::stable_sort. It is stable, it is faster std::stable_sort, and it's running time is O(kN), where k is the number of bytes in the object. That is linear running time, unlike std::sort, which is O(N log N), and radixsort is independent of the input, unlike std::sort. Finally, you can do something called a "sort within sort" using radix quicksort, which is where you sort by one value, than another. These "sort within sorts" are accomplished by appending all of the bytes of your data onto a string, and these bytes come from other strings, integers, and doubles. You then sort it with radix_quicksort, which is incredibly high speed for strings(much faster than std::sort and std::stable_sort). Also, I have uploaded code for radix_sort where you can spcify starting and ending bytes, which is something that I know that the stl does not implement.

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