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

[signal network] implemented inter-computer signal network capability using Boost.Serialization and asio
by Stjepan Rajko 23 Mar '07

23 Mar '07

Hello, In finalizing my SoC proposal for the Signal Network library, I implemented a pair of components which allow signal networks to be built accross multiple computers using Boost.Serialization and asio. An example: computer 1 ----------- // ...construct and connect a tcp asio socket signet::socket_sender sender(socket); generator >>= filter1 >>= sender; computer 2 ----------- // ...construct and connect a tcp asio socket signet::socket_receiver receiver(socket); sender >>= filter2 >>= display; --- This now behaves similar to the following signal network: generator >>= filter1 >>= filter2 >>= display; , but it's distributed accross two computers. The (current) downside is that the receiver is synchronous. An asynchronous version is in the works. http://dancinghacker.com/code/signet has the SoC proposal, documentation, tutorial, examples, and the library code. Stjepan

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[tokenizer] missing include?
by Michael Marcin 23 Mar '07

23 Mar '07

If you include <boost/token_functions.hpp> before <boost/tokenizer.hpp> you get a flood of error which seem to stem from it not including <boost/type_traits/is_pointer.hpp>. (this is with RC_1_34_0) Thanks, Michael Marcin

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wave cpp_tokens sample has a lexing error
by Leo Davis 23 Mar '07

23 Mar '07

Hello, I'm getting a lexing error when I run the attached file though the cpp_tokens sample. This happened in boost 1.33.1 and with the current boost from CVS. From the output of the program, it seems that it's missing the second double quote in the assignment: matched STRINGLIT (#391) at foo.c ( 5/ 5): >"xxxx\\" BAR "< Leo #define BAR "bar" #define BAZ "baz" const char* foo = "xxxx\\" BAR "\\xxxx\\" BAZ;

2 2

[serialization] Support for multiple class name strings
by Zach Laine 23 Mar '07

23 Mar '07

I did something stupid with my serialization code. I blithely changed the names of several polymorphic classes everywhere they appeared in the code, since they had moved out of a class into that class's namespace (e.g. SomeNS::View::Primitive became SomeNS::Primitive). Several months later, I discovered that I could no longer read old binary archives, because I was using Boost.Serialization's BOOST_CLASS_EXPORT() macro, and this macro was now registering the Primtive type with the name-string "Primitive", instead of "View::Primitive", which is how it was saved in the oldest archives. Since there is a 1-1 mapping between name-strings and types, and since most of the Serialization code uses static/global data, I cannot currently support both the archives saved with and the archives saved without the "View::" in the same program. Since I suspect this is not the first time someone has done this, nor the last time someone will do so, is there a way to fix this using the current library? If not, would it be technically possible to add a BOOST_CLASS_EXPORT_ALIAS() macro, or some such? If it is possible, I'm willing to supply the implementation. Zach Laine

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[Boost-bugs] [ boost-Bugs-1685103 ] regex_match throws exception
by SourceForge.net 23 Mar '07

23 Mar '07

Bugs item #1685103, was opened at 2007-03-21 06:39 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=1685103&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: regex Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: krankurs (krankurs) Assigned to: John Maddock (johnmaddock) Summary: regex_match throws exception Initial Comment: Running: MS Windows XP with pack 2, boost_1_33_1, MS VS 2005, VC++ console app, BOOST_REGEX_DYN_LINK; Multi-threaded Debug DLL (/MDd) boost::regex site_url_regex("http(s?)://((\b(?:\d{1,3}\.){3}\d{1,3}\b)|(www(.[a-z0-9]+)+.mydomain.com))"); boost::regex_match("http://www.appwebsite1.mydomain.com", site_url_regex); returns true; (as expected) boost::regex_match("http://www.appwebsite1.mydomain.com/1234", site_url_regex); returns false; (as expected) boost::regex_match("http://www.appwebsite1.mydomain.com/12345678/12345678/", site_url_regex); throws exception, - expected false Thank you, Leonid ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1685103&group_… ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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[serialization] deletion of unconstucted objects
by Sergey Skorniakov 23 Mar '07

23 Mar '07

Hi. I am found that if object, 1) loaded via pointer 2) throws exception in its constructor, while loadind then destructor for this object will be erroneously called Test code: #define BOOST_SERIALIZATION_DYN_LINK #include <boost/archive/polymorphic_iarchive.hpp> #include <boost/archive/polymorphic_oarchive.hpp> #include <boost/archive/polymorphic_xml_iarchive.hpp> #include <boost/archive/polymorphic_xml_oarchive.hpp> #include <boost/serialization/nvp.hpp> #include <boost/serialization/export.hpp> #include <sstream> #include <iostream> struct A { int * p_; A() : p_(new int(10)) {} ~A() { std::cout << *p_; delete p_; } template <class Ar> void serialize(Ar & ar, const unsigned int file_version) { ar & boost::serialization::make_nvp("p", *p_); } }; struct B { A x_; int z_; B(int z) : z_(z) {} B() { throw std::runtime_error("test"); } template <class Ar> void serialize(Ar & ar, const unsigned int file_version) { ar & BOOST_SERIALIZATION_NVP(z_); ar & BOOST_SERIALIZATION_NVP(x_); } }; int main(int argc, char* argv[]) { try { std::stringstream s; { B b(0); B *pb = &b; b.z_ = 5; boost::archive::polymorphic_xml_oarchive ar(s); ar & BOOST_SERIALIZATION_NVP(pb); } { B *pb; boost::archive::polymorphic_xml_iarchive ar(s); ar & BOOST_SERIALIZATION_NVP(pb); delete pb; } } catch (std::runtime_error&) {} return 0; } Tested with boost 1.33.1 on MSVC 8. Member variable B::x_ deleted twice. I see strange piece of code in boost\archive\detail\iserializer.hpp: // catch exception during load_construct_data so that we don't // automatically delete the t which is most likely not fully // constructed BOOST_TRY { // this addresses an obscure situtation that occurs when // load_constructor de-serializes something through a pointer. ar.next_object_pointer(t); boost::serialization::load_construct_data_adl<Archive, T>( ar_impl, t, file_version ); } BOOST_CATCH(...){ BOOST_RETHROW; } BOOST_CATCH_END Its look like that operator delete(ap.release()); or other code that detaches ap missing before BOOST_RETHROW. I had not tested my sample with current CVS version, but had not found any changes in this code and suppose that this error still persists.

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Boost inspection notification (2007-03-23/RC_1_34_0) *X*
by Rene Rivera 23 Mar '07

23 Mar '07

Boost Inspection Report Run Date: 16:07:21 UTC, Friday 23 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| 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 tools/build/v2/tools/python.jam: *R* |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 tools/regression/xsl_reports/xsl/html/summary_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/issues_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/library_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/library_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/make_tinyurl.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/summary_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/summary_user_legend.html: *A* unlinked file |serialization| libs/serialization/src/basic_xml_grammar.ipp: *U* unnamed namespace at line 43 |test| boost/test/floating_point_comparison.hpp: *U* unnamed namespace at line 206 *U* unnamed namespace at line 228 boost/test/impl/cpp_main.ipp: *U* unnamed namespace at line 42 boost/test/impl/exception_safety.ipp: *U* unnamed namespace at line 400 boost/test/impl/framework.ipp: *U* unnamed namespace at line 199 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 (2007-03-23/RC_1_34_0) *LC*
by Rene Rivera 23 Mar '07

23 Mar '07

Boost Inspection Report Run Date: 16:07:28 UTC, Friday 23 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] 68 regressions on RC_1_34_0 (2007-03-23)
by Douglas Gregor 23 Mar '07

23 Mar '07

Boost Regression test failures Report time: 2007-03-23T01:36:02Z 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… 68 failures in 4 libraries iostreams (6) optional (6) parameter (1) python (55) |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| bases: gcc-4.1.1_sunos_i86pc builtin_converters: gcc-3.4.5_linux gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 crossmod_exception: gcc-3.2.3_linux gcc-3.3.6_linux gcc-3.4.5_linux gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 intel-linux-9.0 crossmod_opaque: gcc-3.2.3_linux gcc-3.3.6_linux gcc-3.4.5_linux gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 intel-linux-9.0 exec: gcc-4.1.1_sunos_i86pc exec-dynamic: gcc-3.4.5_linux gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc import_: gcc-4.1.0_linux_x86_64 gcc-mingw-3.4.2 gcc-mingw-3.4.5 msvc-6.5 msvc-6.5_stlport4 msvc-7.1 msvc-7.1 msvc-7.1_stlport4 msvc-8.0 iterator: gcc-3.2.3_linux gcc-3.3.6_linux gcc-3.4.5_linux gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 intel-linux-9.0 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 pointee: gcc-4.1.1_sunos_i86pc pointer_type_id_test: gcc-4.1.1_sunos_i86pc try: gcc-3.2.3_linux gcc-3.3.6_linux gcc-3.4.5_linux gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 intel-linux-9.0 upcast: gcc-4.1.1_sunos_i86pc

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Re: [boost] Review of Intrusive library begins today March 12
by Ion Gaztañaga 23 Mar '07

23 Mar '07

Hi Pavel, Nice to see you've found time to the the review. I will reply the comments that I'll consider most important: Pavel Vozenilek wrote: > * An vector-like pseudo-intrusive container may be added. > It is superfluous but people may like it more than lists. Well, a vector is not even pseudo-intrusive, because it has no nodes. std::vector<> + allocator is not sufficient in your opinion? > (Is a map like intrusive container possible, btw?) I think a map-like intrusive structure is not very useful. A iset with a value type that has std::pair interface is enough, the advanced search functions can be used to compare the key part with the value type. > * More examples, e.g. one example per every combination of > hooks and containers, just to have something to copy, paste and play. "Every combination" might be too much ;-) but when presenting each container, I might add example using different hooks. > ================================================================ > One existing library that implement intrusive containers is Data Object > Library > (http://www.codefarms.com/dol.htm, also http://www.codefarms.com/ptl.htm) > > > This library uses external, preprocessor like, tool to generate > code that handles lifetime management of the data. > It meansd that you create an object, add into into how many > containers you want and when it is removed from the last > container then it gets automagically deleted. > > > Author of the library claimed development time speedup 10x > comparing to classical manual lifetime management. > > jjLib (http://sourceforge.net/projects/jjlib/) > is based on the same pronciples and also uses external > code generator. I will look these for ideas and new features. > What I imagine as potentially possible is for the > Intrusive Container library (or its complement) > to completely manage lifetime of inserted objects: > > * when an object is removed from the last container > it gets automatically deleted. This would need an embedded reference counted hook. but these reference count should be shared between all the hooks of a value type (including hoooks from base classes). Not an easy task to do in standard C++, I guess ;-), but I will put it in my investigation list. > ================================================================ > Naming conventions: > > * I would personally prefere names like boost::intrusive_slist. > The ilist is too easy to overlook and this type of naming is > used way too often to cause confusion. Ok. People consider boost::intrusive::slist good enough, but I have no problem with the names. > * The code snippets should not use generic names as Vector or List > for the same reason. Ok. > * ilist_auto_base_hook etc.: it is not really clear whether the > class is intended to be base (it would end with _base). It's difficult to find a meaningful short name. I think list_base_hook is good enough, but suggestions are welcome. > Perhaps auto_removing_i[ntrusive_]list_base. The word "hook" > looks as unnecessary. The member hook may look like: > auto_removing_i[ntrusive_]list_support. Others have proposed using a single class using template parameters to specify the linking policy (safe, normal, auto-unlink). > 1. overview.html: the sentence > > "On the other hand, an intrusive container does not store > copies of passed objects, but it stores the objects themselves." > > may be better w/o using work store: > > "On the other hand, an intrusive container does not insert > copies of passed objects, but it references the objects themselves, > without copying their data." > > or so. Your phrase is not convinging for me, but I don't find mine good enough. > "If you want to share an object between two containers, you either > have to store multiple copies of those objects or you need to > use containers of pointers: std::list<Object*>." > > append "... or of smart pointers" just to remind this. Ok. > ------------- > typo: Boost.Intrusivecontainer - missing space Ok. > -------------- > "In intrusive containers you don't store a copy of an object, > but rather the original object itself." > > may be better reworded to avoid "store" which usually implies copying. Ok, but which other word would you use? > ________________________________________________________________ > 2. concepts.html: > > Evry concept here may contain link to a small but complete example. > > If is the second page in documentation and it may be bit > too scaring for a newbie to get overloaded with abstract > concepts w/o seeing what it could be good for. I will try to link concepts. Others have proposed moving he full concepts page to the end of the documentation and start with an small summay. > The bullet item starting with "Node Traits" is a bit hard to parse: > > * the term basic operations may be explained (or at least > differenciated from NodeAlgorithms at this point) > * "defines the interface" may be better "expects interface" > > typo " to its own class" -> "to his own class" Ok. > "ValueTraits will contain the information to convert user classes > in nodes compatible with Node Algorithms." > > I am missing what are the user classes converted into > (that's that way I parsed it). Ok. I will try to improve this. > I do not like the term "Pseudo-Intrusive Container" > * it suggest something less worth that the "real container" > * it gives impression that the essence of intrusiveness > is missing here, which it is not, AFAICS > > Perhaps "Intrusive Container with auxiliary allocated memory" > looks clumsy but it exactly says what it is and nothing more. I would prefer something shorter ;-) > In concepts summary: the sentence > > "Node Algorithm: A class containing typedefs and static functions > that manage a group of nodes." > > - the word "manage" is used for the first tima and may > mean quite a many things. Something like "...that define basic operations that can be applied to a groups of nodes"? > The term "Node" if not defined and assumed implicitly > (or from one prior code snippet). ...and this one it's quite difficult to define, I'm afraid. > ------------- > Possibly the names of the concepts may reflect > which concetps are already implemented by the > library and which always need to be reimplemented > by the user. All these concepts are implemented by the library, even though some are customizable by the user. > Auto-unlink hooks are mentioned here for the first time > but ony in one sencence, As this may be one of the most > useful features there ay be a link and/or example > so the reader would be able to test it immediatelly. Ok, a link to the auto-unlink hooks page would be enough. > ________________________________________________________________ > 4. usage.html: > > Possibly this page may contain a link > to complete examples of all possible combinations, e.g.: > > * node with base hook > * node with several base hooks > * node with member hook > * node with several member hooks Don't you think this is a bit too much? Do you think an example using both (base and member) is too confusing? > It may be mentioned that tag does not need to be fully specified. Ok. > ------------- > the code snippet with > typedef boost::intrusive::ilist_base_hook<Foo>::value_traits<Foo> > FooValueTraits; > > > contradicts the complete example bellow with: > > typedef ilist< ilist_base_hook<my_tag>::value_traits<MyClass> > BaseList; > > (in what is used as the template parameter of value_traits). Well, MyClass is a concrete class of the example, so I thought it was not confusing, I could just write MyClass in both examples, if that's less confusing. > "With these features, without any external reference > the user can know if the object has been inserted in > a container." > > - this should mention the API call to find out this information. Ok. > --------------- > The safe mode (probably) applies to single hook, not for > situations with two or more hooks. No, the safe mode is applied for every hook. If you try to insert an object in a container and it's already inserted in another container that uses the same hook, the code will assert. > The items: > * the programmer needs to efficiently track the construction and destruction > of objects > * exception safety, especially the no-throw guarantee, is needed > > may need bit more context. > > The item: > * additional memory management should be avoided > > may talk rather about the allocation. I'll try to elaborate a bit more. > //This is a container of abstract values: you can't do this with std::list. > typedef boost::intrusive::ilist< Window::value_traits<Window> > win_list; > > "abstract value" is what? Ok. "Abstract class" is maybe more correct? > ________________________________________________________________ > 6. auto_unlink_hooks.html: > > "non-constant time containers" - should have backlink > to information what it is. Ok. > ---------------- > "If several threads are using the same container, > removing the object is thread-unsafe." > > I guess that is true for removing an item from > container explicitly. I will improve it. The difference is that removing explicitly can be executed with a locked mutex, whereas the destructor is not explicitly called, will be automatically executed and the user might forget this operation. > ---------------- > > "Container contents change silently without touching the > container directly. This can lead to surprising effects." > > touching => referencing > This can lead ... => Touching is not referencing. Touching should say "modifying" > The bool used for SafeMode template parameter may be replaced > by an enum and symbolic name. Ok. > ilist_auto_base_hook<>::linked() > > may be is_linked() or is_in_container(). is_linked() sounds good. No problem to change it. > --------------- > Possible change in API: the second and third template parameters > may be merged into one, like: > > template<class ValueTraits, class SizeType = std::size_t> > class islist; > > and for no constant size() used as > > ilist<a_tag, boost::size_not_kept> I've already explained that I consider these properties orthogonal. You might not have a constant-time size but still need a non trivial std::size_t to give support for allocator based non-intrusive containers. > Explanation why the islist is circular and > what impact it has on semantics is missing. Others prefer to remove this reference and not say how it's implemented. I think this should be the case with list/slist/set-containers that can be implemented differently. If more containers are added, like irbtree/avl_tree or similar, this should be explained. > It would be interesting to hear whether > the "two-way pointers" > (e.g. http://www.semantics.org/code.html#flist) > could be used together with Boost.Intrusive Containers. I will investigate it. > ________________________________________________________________ > 9. iset_imultiset.html: > > "Boost.Intrusive also offers associative containers > that can be very useful when creating more complex > associative containers,..." > > - this is like saying a class may be used to built > more complex classes, i.e. redundant (unless I am missing > something). Ok. I´ll remove it. > OT question: could a intrusive container > with the data be ROMable? This may be mentioned > somewhere. I don't think so, because an intrusive container must modify the objects. > ________________________________________________________________ > 10. iunordered_set_iunordered_multiset.html: > > memory allocator may be added as template parameter. > If someone has really critical need for speed he may employ > a zone allocator. I prefer maintaining memory allocator out of Intrusive. I think this is the correct approach to maintain, even with pseudo-intrusive containers. > ________________________________________________________________ > 11. advanced_lookups_insertions.html: > > "advanced lookup" may be named "matching by partial key", > "advanced insertions" could be "optimized insertion". > > The lookup by partial key is employed by at least one > other library, if found it may be referenced. Apart from partial keys other types comparable with the value type can be used, so I don't like this term. > ________________________________________________________________ > 12. erasing_and_destroying.html: > [snip] > Possible problems with the approach here: > > * it is not possible to enforce that the objects > destroyed were dynamically allocated. > > * it is dangerous when object is part of more than > one intrusive container. > > * the names remove_and_destroy, erase_and_destroy > and clear_and_destroy are not very helpful. Some have proposed "dispose". I think this feature is really useful to easily build non-intrusive containers above intrusive containers. > ________________________________________________________________ > 13. clone_from.html: > [snip] > I noticed the documentation does not mention > copyability and assignability of the data handled > by intrusive containers. Pehaps the intro should > inform what is possible, what is recommended > and what dangers there are. The data handled by intrusive containers have no restrictions. It can be non-copyable and non-moveable, as it's explained in the documentation. > One needs to remember that the cloned container > needs to be destroyed explicitly and manually. > It feels rather dangerous. Just like the container from you cloned ;-) That's how intrusive containers work. Your clone function could have just allocate a vector of objects and return a reference instead of calling new. > class X { ... }; > > X x; > > ilist<X> c1; > ilist<X> c2; > c1.push_back(x); > > c1.clone_from(c1, ...); // will work c1 first clears the target container, so there is nothing to clone. > X x1; > X x2; > > ilist<X> c3; > ilist<X> c4; > c3.push_back(x1); > c4.push_back(x2); > > // will this crash? > // (the destroyed will try to delete the local x1) > c3.clone_from(c4, ...); The cloner will not try to delte the local x1, it will just call your destroyer function. Obviously, if you are using local objects this will crash, but with intrusive containers the programmer has the responsibility of memory issues. > ________________________________________________________________ > 14. using_smart_pointers.html > > offset pointer should not be called smart pointer. Why not? Smart pointers don't need to be related with lifetime management issues, as I understand the term. How would you call offset_ptr, a "pointer class"? > Boost.Smart Pointers is permitted here or not? No. > The docs may say why Boost.Smart Pointers are > not useful here. The docs already state that the smart pointers need to have the same ownership semantics as raw pointers. But i will explicitly say the Boost.SmartPointer classes are not compatible. > ________________________________________________________________ > 15. obtaining_iterators_from_values.html > [snip] > ------------ > > The docs may say what is this feature good for > (traversal, yes, but bit complicated as one needs > to keep the first obtained iterator). An iterator is the key to access to STL algorithms. If you have the value, you have access to STL algorithms. > Something as ability to get the end() and begin(), > that would be a killer feature. I'm afraid this will be difficult. > "local iterators" - a term I never saw before. > Without knowing what it is I do not get > half of the content here. It's in the hash table proposal for C++0x. > ----------- > > Now I understand that the node algorithms + traits > are like building blocks of the library (or are they > completely separate?). These are building blocks, but they can be used for other tasks where containers are not suitable. > > Custom ValueTraits example: > > "...we only need an extra pointer..." > > w/o the "extra". Ok. > Invalid comment in example code (on the bottom of this section): > //Now test both lists Ok. > ------------ > ValueTraits::value_type vs. NodeTraits::node > > - could be named "reusing primitive intrusive > operations for different values" "Reusing node algorithms for different values" might be better. > Boost.Intrusive in space constrained environments > > - here may be a table listing (again) the overhead > or calculation of the overhead for > list/slist/... node and of list/slist/... container. I will add this as a separate chapter. > "For example, the programmer can use Boost.Intrusive to manage > old data structures whose definition can't be changed." > > -> ...can customize parts of Boost.Intrusive ... Ok. > > ________________________________________________________________ > 19. acknowledgments.html: > > Joaquin M. Lopez Munoz - some diacritics is missing, doesn't? Yes. I still don't know how to insert them in Quickbook, maybe a UTF editor is needed to achieve this. In the header HTML style scape sequences can be used, but not in the documentation body. Don't worry Joaquín, I'll fix that ;-) > why is ilist(const ilist &); > listed in public interface if it is not implemented? > Dtto operator=(). Boostbook/Doxygen error. Recently fixed in CVS thanks to Eric Niebler. > void push_back(value_type &) ; > > - why non-const reference? Coudn't it make > problems when an temporary is used as the parameter? Const refernece has no sense with intrusive containers, because the value has to be modified. Temporaries can't bind to non-const references. > Possibly shift(integer how_much = 1) member could be added > that would move begin() and end(). > > Use case: list of tasks to be processed repeatedly. I'll think about this. > "Containers also know that the a value can be silently erased..." > - what does it mean "they know" - that empty() has worse O complexity? No just that they must cope with the fact that between two operations, the number of present nodes might have changed. For example, the size can't be internally stored (because it would be invalidated if an auto-unlink value operates between two operations). > * Example using BOOST_FOREACH could be added somewhere. I'm not a big fan of it ;-( > * Does Boost.Assign work with this library? No idea. But I plan to maintain the library without many dependencies or compile-time overhead. > * Does the library works together with Boost.Serialization? No. Deserialization would be also a problem. How will be the objects created? (intrusive containers don't manage memory) > * Does the library (in debug mode) detect adding the same > object multiple times into the same container? If you are use safe-mode or auto-unlink hooks, yes. > * perhaps a header with forward declarations could be added > into the library, like boost/intrusive_containers_fwd.hpp. Ok. > ________________________________________________________________ > EOF Thanks for your thorough review. Professional, as always, Regards, Ion

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