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

regex_match and temporaries
by Michael Lacher 07 Mar '07

07 Mar '07

Using valgrind I found an unexpected behavior in regex_match when using temporaries. Although the input parameters allow using temporaries for the string to search in (i was using the variant that takes const std::string&), actually accessing the matches using a boost::smatch will try to look up the data in the already destructed temporary. I could not find a note in the documentation that describes this limitation, I think some clarification would be good. regards, Michael

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[Soc suggestions] TR1 implementation
by AlisdairM 07 Mar '07

07 Mar '07

How close are we to having a releasable Boost implementation of TR1? There are also a few interface changes for some Boost components to catch up with, most of which seem implemented in the HEAD already. I know we are missing the following libs: unordered containers special math functions C99 library I believe John Maddock and Paul Bristow have a library in the review queue that will go a long way towards providing the math functions, and there have been mutterings about unordered containers over the years, but not sure of their current state. Don't think we have anything in place for C99 though? There is the issue of packaging the distribution, where John Maddock has has some preliminary work. Is this a project we could imagine completing with a SoC student or two? -- AlisdairM

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[boostbook] documenting protected/private members?
by Frank Mori Hess 06 Mar '07

06 Mar '07

Is there no way to document a class' protected members using boostbook? It seems to assume everything is going to be public. -- Frank

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[1.34.0] Regressions state
by Vladimir Prus 06 Mar '07

06 Mar '07

This is the summary of regression results as I see it: 0. The regression framework seems OK. It's also more reliable now -- thanks to Aleksey, who made XSLT processing more strict, and fixed process_jam_log not to loose some output. 1. We have a number of regressions with intel-linux-9.0. They come from two runners -- Martin and Sandia. In Martin's result most failures are due to an command line option that intel-9.0 does not understand, and Martin's results were not updated since I've checked in the fix. Sandia's results are post fix, and I see no linker errors. There are some failures that look genuine. 2. We have a large number of regression with msvc-stlport configurations. Most are linker errors, which suggests misconfiguration or Boost.Build bug, or both. I'll work with Roland on a solution. 3. There are some fails that look genuine. I think the right way to get 1.34 released now, as far as regression tests are concerned is this: 1. Completely freeze the list of tested compilers. This means that anything not tested now is not tested. Notably, we'll have no coverage for mingw or cygwin versions of gcc. 2. Have me and Roland fix stlport issues. 3. Start pinging developers about remaining failures. I think we should adopt a policy that will guarantee that all failures be resolved in a reasonable time -- namely, if a failure is not fixed by a certain date, it's marked expected and we move on. That cut-off date might be two weeks from the next Monday -- Feb 26. Both (1) and (3) will certainly have an effect on release quality -- we'll mark some failures as expected instead of fixing them, and we won't see failures on some configuration. However, I believe having a release sooner is more important at this point. Thomas, I would like you to express your opinion on this plan. Opinions from other Boosters are also appreciated! - Volodya

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[build][python] can't specify --with-python-root
by Kim Barrett 06 Mar '07

06 Mar '07

Not sure whether this a boost.build problem, a boost.python problem, or simply a failure in my understanding. In boost 1.33.1 one could specify the location of the Python version to be used by Boost.Python using the --with-python-root option to bjam. This isn't working on the RC_1_34_0 branch. (I haven't looked at HEAD.) Looking at the boost root Jamfile.v2, it looks like this is still expected to work, in that there is code that looks for that option and sets some variables based on its value. However, it does not actually work because there is other code in that same file which examines all --with-XXX options to determine which optional libraries to add. So it treats python-root as a candidate for such a library. Unfortunately, it then determines that this isn't a recognized library name, and so errors out. So there seems to be at least some inconsistency here. Also, simply taking out the --with-python-root results in a warning that the Python location was not configured, and so the Boost.Python library won't be built. Is there some other mechanism that one can / is supposed to use to specify this particular bit of configuration information?

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Boost inspection notification (2007-03-06/RC_1_34_0) *X*
by Rene Rivera 06 Mar '07

06 Mar '07

Boost Inspection Report Run Date: 17:06:44 UTC, Tuesday 06 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) 195 problems reported Problem counts: 0 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 (1) 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| boost/archive/basic_streambuf_locale_saver.hpp: *N* name exceeds 31 characters boost/archive/impl/xml_wiarchive_impl.ipp: *U* unnamed namespace at line 53 boost/archive/iterators/remove_whitespace.hpp: *U* unnamed namespace at line 57 |bind| boost/bind/placeholders.hpp: *U* unnamed namespace at line 25 |boost-root| index.htm: *A* broken link: doc/hmtl/date_time.html *A* broken link: doc/hmtl/date_time/details.html#changes *A* broken link: more/BoostCon07.html |build| tools/build/v2/test/test_system.html: *A* unlinked file |date_time| libs/date_time/xmldoc/date_time_docs_howto.html: *A* unlinked file |doc| doc/html/boost_math/inverse_complex.html: *A* unlinked file doc/html/jam.html: *A* unlinked file |filesystem| libs/filesystem/doc/do-list.htm: *A* invalid URL (hardwired file): file://?/ *A* invalid URL (hardwired file): file://?/UNC/ libs/filesystem/doc/i18n.html: *A* broken link: convenience.htm#basic_recursive_directory_iterator *A* broken link: exception.htm *A* broken link: operations.htm *A* broken link: operations.htm#Do-the-right-thing *A* broken link: operations.htm#is_directory *A* broken link: operations.htm#is_file *A* broken link: operations.htm#status libs/filesystem/doc/index.htm: *A* broken link: ../build/Jamfile *A* broken link: convenience.htm *A* broken link: fstream.htm *A* broken link: operations.htm#create_directory *A* broken link: operations.htm#create_hard_link *A* broken link: operations.htm#current_path *A* broken link: operations.htm#directory_iterator *A* broken link: operations.htm#equivalent *A* broken link: operations.htm#file_size *A* broken link: operations.htm#initial_path *A* broken link: operations.htm#is_file *A* broken link: operations.htm#is_symlink *A* broken link: operations.htm#status *A* broken link: operations.htm#symlink_status *A* broken link: path.htm#Canonical *A* broken link: path.htm#Grammar *A* broken link: path.htm#Normalized *A* broken link: path.htm#default_name_check *A* broken link: path.htm#name_check_mechanism *A* broken link: path.htm#normalize *A* broken link: path.htm#operator_eq *A* broken link: path.htm#synopsis libs/filesystem/doc/portability_guide.htm: *A* broken link: path.htm#name_check_typedef libs/filesystem/doc/tr2_proposal.html: *A* invalid URL (hardwired file): file:///C|/boost/site/libs/filesystem/doc/operations.htm#complete_note |graph| libs/graph/example/file_dependencies.cpp: *M* violation of Boost min/max guidelines on line 139 libs/graph/test/serialize.cpp: *T* |iostreams| libs/iostreams/doc/acknowledgments.html: *A* unlinked file libs/iostreams/doc/concepts/multi-character.html: *A* unlinked file libs/iostreams/doc/installation.html: *A* broken link: ../../../tools/build/v1/build_system.htm |lambda| boost/lambda/core.hpp: *U* unnamed namespace at line 62 boost/lambda/detail/lambda_functors.hpp: *U* unnamed namespace at line 25 boost/lambda/exceptions.hpp: *U* unnamed namespace at line 24 |math| libs/math/test/common_factor_test.cpp: *M* violation of Boost min/max guidelines on line 146 *M* violation of Boost min/max guidelines on line 147 *M* violation of Boost min/max guidelines on line 193 *M* violation of Boost min/max guidelines on line 194 |more| more/separate_compilation.html: *A* broken link: ../libs/config/test/link/test/Jamfile.v2 |mpl| boost/mpl/alias.hpp: *U* unnamed namespace at line 17 |multi_array| boost/multi_array/base.hpp: *U* unnamed namespace at line 69 libs/multi_array/test/generative_tests.hpp: *U* unnamed namespace at line 57 |ptr_container| libs/ptr_container/doc/tutorial_example.html: *A* unlinked file |python| libs/python/doc/building.html: *A* broken link: ../../../tools/build/v1/build_system.htm *A* broken link: ../../../tools/build/v1/build_system.htm#user_globals *A* broken link: ../../../tools/build/v1/build_system.htm#variants libs/python/doc/tutorial/doc/html/python/hello.html: *A* broken link: ../../../../../example/tutorial/Jamrules libs/python/doc/tutorial/index.html: *A* broken link: ../../../LICENSE_1_0.txt libs/python/doc/v2/May2002.html: *A* broken link: ../../../../tools/build/v1/build_system.htm *A* broken link: ../../../../tools/build/v1/gen_aix_import_file.py libs/python/doc/v2/faq.html: *A* broken link: ../../../../tools/build/v1/build_system.htm |regex| libs/regex/performance/input.html: *A* unlinked file |regression| regression/.htaccess: *N* leading character of ".htaccess" is not alphabetic tools/regression/test/test-cases/incremental/bjam.log.1: *N* name contains more than one dot character ('.') tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/compile-fail.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/completed.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/compile-fail.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/completed.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/lib.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/misfire.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/no-run.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/run_pyd.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/test-case.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/test-case.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/test-driver.xsl: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_re_match/expected/test_re_match.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_test_case_status/explicit-failures-markup.xml.test: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ *N* name contains more than one dot character ('.') *N* name exceeds 31 characters tools/regression/xsl_reports/test/test-components/test_test_structure/explicit-failures-markup.xml.test: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ *N* name contains more than one dot character ('.') *N* name exceeds 31 characters tools/regression/xsl_reports/xsl/html/issues_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/library_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/library_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/make_tinyurl.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/summary_developer_legend.html: *A* unlinked file 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boost/test/impl/plain_report_formatter.ipp: *U* unnamed namespace at line 45 boost/test/impl/progress_monitor.ipp: *U* unnamed namespace at line 38 boost/test/impl/results_collector.ipp: *U* unnamed namespace at line 106 boost/test/impl/results_reporter.ipp: *U* unnamed namespace at line 48 boost/test/impl/unit_test_log.ipp: *U* unnamed namespace at line 79 boost/test/impl/unit_test_monitor.ipp: *U* unnamed namespace at line 35 boost/test/impl/unit_test_parameters.ipp: *U* unnamed namespace at line 50 boost/test/results_collector.hpp: *U* unnamed namespace at line 40 boost/test/test_tools.hpp: *U* unnamed namespace at line 262 boost/test/utils/iterator/token_iterator.hpp: *U* unnamed namespace at line 166 boost/test/utils/named_params.hpp: *U* unnamed namespace at line 216 boost/test/utils/runtime/cla/dual_name_parameter.ipp: *U* unnamed namespace at line 43 boost/test/utils/runtime/cla/modifier.hpp: *U* unnamed namespace at line 34 boost/test/utils/runtime/env/modifier.hpp: *U* unnamed namespace at line 34 boost/test/utils/runtime/file/config_file.hpp: *U* unnamed namespace at line 169 *U* unnamed namespace at line 64 *U* unnamed namespace at line 74 boost/test/utils/runtime/file/config_file_iterator.hpp: *U* unnamed namespace at line 68 boost/test/utils/trivial_singleton.hpp: *U* unnamed namespace at line 52 *U* unnamed namespace at line 61 libs/test/build/msvc71_proj/config_file_iterator_test.vcproj: *N* name exceeds 31 characters libs/test/doc/components/prg_exec_monitor/compilation.html: *A* broken link: ../../../build/Jamfile libs/test/doc/components/prg_exec_monitor/index.html: *A* broken link: ../../../../../boost/test/cpp_main.hpp libs/test/doc/components/test_tools/index.html: *A* broken link: ../../tests/boost_check_equal_str.html libs/test/doc/components/test_tools/reference/BOOST_CHECK_CLOSE.html: *A* broken link: BOOST_CHECK_CLOSE_FRACTION.html libs/test/doc/components/test_tools/reference/BOOST_CHECK_MESSAGE.html: *A* broken link: BOOST_MESSAGE.html libs/test/doc/components/test_tools/reference/BOOST_CHECK_SMALL.html: *A* broken link: BOOST_CHECK_CLOSE_FRACTION.html libs/test/doc/components/test_tools/reference/tools_list.html: *A* broken link: ../../btl1.gif *A* broken link: BOOST_CHECK_CLOSE_FRACTION.html libs/test/doc/components/utf/compilation.html: *A* broken link: ../../../build/Jamfile libs/test/doc/components/utf/components/index.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/components/test_case/abstract_interface.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/auto_register_facility.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/boost_function_tc.html: *A* broken link: ../../../../../../../boost/test/unit_test_suite_ex.hpp *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/class_tc.html: *A* broken link: ../../../btl1.gif 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Boost inspection notification (2007-03-06/RC_1_34_0) *LC*
by Rene Rivera 06 Mar '07

06 Mar '07

Boost Inspection Report Run Date: 17:06:50 UTC, Tuesday 06 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] 55 regressions on RC_1_34_0 (2007-03-06)
by Douglas Gregor 06 Mar '07

06 Mar '07

Boost Regression test failures Report time: 2007-03-06T01:41:10Z 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… 55 failures in 9 libraries graph (4) iostreams (7) math (1) numeric/interval (1) optional (12) parameter (1) python (25) regex (1) test (3) |graph| dijkstra_heap_performance: msvc-7.0 graphviz_test: msvc-7.1_stlport4 layout_test: msvc-7.0 relaxed_heap_test: msvc-7.0 |iostreams| bzip2_test: msvc-7.1 msvc-8.0 file_descriptor_test: gcc-cygwin-3.4.4 gzip_test: msvc-7.1 msvc-8.0 zlib_test: msvc-7.1 msvc-8.0 |math| common_factor_test: msvc-6.5 |numeric/interval| test_float: msvc-7.1_stlport4 |optional| optional_test: darwin-4.0.1 gcc-3.4.5_linux gcc-3.4.5_linux_x86_64 gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc hp_cxx-71_006_tru64 msvc-6.5 msvc-7.0 optional_test_ref_fail2: msvc-7.1 msvc-8.0 |parameter| python_test: gcc-cygwin-3.4.4 |python| bases: intel-linux-9.0 exec: intel-linux-9.0 import_: cw-9.4 darwin-4.0.1 gcc-3.2.3_linux gcc-3.3.6 gcc-3.3.6_linux gcc-3.4.5_linux gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.1_sunos_i86pc hp_cxx-71_006_tru64 intel-linux-9.0 intel-linux-9.0 intel-vc71-win-9.1 msvc-6.5 msvc-7.0 msvc-7.1 msvc-7.1 msvc-8.0 msvc-8.0 msvc-8.0 pointee: intel-linux-9.0 pointer_type_id_test: intel-linux-9.0 upcast: intel-linux-9.0 |regex| regex_regress_threaded: msvc-8.0 |test| boost_check_equal_str: msvc-6.5 prg_exec_fail3: cw-9.4 test_tools_test: msvc-6.5

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Re: [boost] [serialization] performance comparison
by brass goowy 06 Mar '07

06 Mar '07

Rene Rivera writes: >brass goowy wrote: >> I agree it is a tenuous system. On the other hand how much of a leap >> is it from using a network file system when building? > > >Ask a company layer, project manager, sysadmin that question to get an >idea of the magnitude of the leap. > >> No one has answered my question of how to obtain 1.34. > >Perhaps because it was easy enough to find the info with a bit of >reading/searching <http://boost.org/more/release_procedures.htm>. > Thanks. I looked for the answer for about thirty minutes. After not coming up with the info that way I asked. > >But at this point I'm confused about goals... If you are not discussing >an existing Boost library, The post did discuss a Boost library. Slater said he was interested in finding ways to improve the performance of B.Ser. I wrote my ideas about that. Beyond that I was replying to some of the points he had made in his previous post. >nor discussing a possible Boost library >submission. What are you trying to achieve by asking questions in this >group? With the question about 1.34, I wanted to get some information. With the question about online code generation I want to understand what he is getting at and if there is a technical problem with the online approach that we haven't considered. Regards, Brian Wood Ebenezer Enterprises www.webEbenezer.net _______________________________________

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Any interest in dimensional analysis for orientational dimensions and Euclidean vectors?
by Andreas Harnack 05 Mar '07

05 Mar '07

Further to the ongoing discussion of (physical) dimensional analysis and the physical dimension/unit library I'd like to propose a library providing two services: 1.Orientational analysis, i.e. compile time analysis for dimensions indicating a direction in space, also called mathematical dimensions (in contrast to physical dimensions). 2.Aggregation of values carrying orientational dimensions into a data structure suitable to represent the concept of vectors in the geometrical and algebraical sense. A major application of such a vector class will be Euclidean geometry, so for lack of a better name and to distinguish it from other concepts using the name vector I'd like to talk about Euclidean vectors. The library is not intended to be a linear algebra library. No algorithms are provided that go beyond scalar and cross product. A matrix class is included too, but restricted to diagonal matrices, since matrix inversion is involved and matrix inversion is trivial only for diagonal matrices. I'm going to uploaded a proposal into the boost vault under the name 'euclid'. It comes with test programs, examples and a documentation, discussing some issues of dimensional analyses in general, the current implementation of Euclidean vectors and possible ways of extending orientational analysis to a linear algebra library. The code presented here is real life code taken from a former application project. It has not been designed with a standalone library in mind. As such it's likely to have some deficiencies. However, it seems to be a useful concept, yet reasonably simple, and worth of sharing. If there's interest in the community , I'd take the effort to boost it up to the required standards. The library began as a template providing orientational analysis in an application project involving graphical programming in both, character cell graphic as well as pixel graphic. A major source of errors was the risk to mix up of x and y coordinates, especially since several libraries where involved with different interface conventions. Using orientational analysis reduced the error rate significantly. After having a system of type distinct coordinates and coordinate expressions that could be check at compile time, it soon became apparent that it would be helpful to aggregate coordinates into vectors. However, accepting coordinates as being type distinct has some fundamental implications on the design of a vector class: the vector can no longer be a container, since container aggregate equally typed objects. Neither access operators nor iterators can be defined in the traditional way, since type would change depending on the object returned or referenced. Consequently, vectors are better represented by structures rather than arrays. To allow for an arbitrary number of dimensions a recursive template structure has been defined. Component access is provided by explicit type conversion into the component type: namespace euclid { // dimension class template template<typename T, unsigned int D> class dim { T v; public: // operations allowed for dim ... }; // vector class template template<typename T, unsigned int D> class vec { dim<T, D-1> d; vec<T, D-1> v; public: // element access template <unsigned int I> operator dim<T,I>() const { return dim<T, I>(v); } operator dim<T,D-1>() const { return d; } // vector operations ... }; // vector class base case specialization template<typename T> class vec<T,1> { dim<T,0> d; public: // element access operator dim<T,0>() const { return d; } // vector operations ... }; }; The operations defined for vectors and dimensions are those typically defined for vector spaces including some (hopefully) reasonable access and conversion operations. Applications will typically start by specializing the templates to their specific needs, like: namespace myApplication { typedef int scalar; typedef euclid::dim<scalar,0> dimX; typedef euclid::dim<scalar,1> dimY; typedef euclid::vec<scalar,2> vect; // ... } or may be templated: template <class T> class myClass { public: typedef euclid::dim<T,0> dimX; typedef euclid::dim<T,1> dimY; typedef euclid::vec<T,2> vect; // ... } Now these types can be used almost like build-in types with the benefits of additional type checking void foo(vect v); void bar(dimX x); void bar(dimX x, dimY y); int main() { dimX x, x0, x1; dimY y; vect v; x = x0+x1; // OK y = x; // Error bar(x) // OK bar(2*x0+x1) // OK bar(x+y) // Error bar(x,y) // OK bar(x,x) // Error bar(y,y) // Error bar(y,x) // Error bar(v,v) // OK, calls bar(dimX(v), dimY(v)); foo(2*v) // OK // etc. } The library addresses a problem that occurs (at least) in any application or library involving graphical programming. It is, however, surprisingly simple in both, implementation and usage. To my knowledge, no graphical library has addressed orientational analysis yet, while vectors are typically implemented by some library specific data structures, requiring unnecessary conversions when passing data from on library to another. Euclidean vectors could offer a way to solve this interface problem. As mentioned above, there's still a way to go to get the code ready for formal review, in particular naming, layout, format and licensing issues. If there's interest in the community I'd be happy to do this, so please let my know. I will, however, need assistance in proving (and improving) portability. The library compiles with GNU g++ 3.0.4, 3.3.5 and 3.4.4, but I will be unable to test it on any other platform in the near future. Looking forward to any comments, Andreas

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