- Boost - lists.boost.org

Re: [boost] [dynamic_any] multimethods
by Steven Watanabe 30 Nov '06

30 Nov '06

AMDG Alexander Nasonov wrote: > Steven Watanabe wrote: > >> > typedef any_tuple<_1, _1, _2, >> > where_<random_access_iterator<_1>, callable<_2, bool(deref_result<_1>, >> > deref_result<_1>)> > > sort_args; >> > void sort_impl(mpl::at<sort_args, _1>::type&, mpl::at<sort_args, >> > _1>::type&, mpl::at<sort_args, _2>::type&); >> > template<class Iter, class F> >> > void sort(Iter begin, Iter end, F f) { >> > sort_args args(begin, end, f); >> > sort_impl(get<0>(args), get<1>(args), get<2>(args)); >> > } >> > I don't quite understand how it's connected to dynamic_any::any > objects. Does object 1 stores an iterator to a beginning of a sequence > while object 2 stores past-the-end of the sequence? Yes. In a cpp file sort_impl would just be void sort_impl( mpl::at<sort_args, _1>::type& begin, mpl::at<sort_args, _1>::type& end, mpl::at<sort_args, _2>::type& f) { std::sort(begin, end, f); } The idea was the each element of the tuple would be like a dynamic_any::any object with operations on several elements like f(*begin, *next(begin)). So, in my example deref_result<_1> is a placeholder for the type of *begin. I think it would be defined something like: template<class> struct deref_result : placeholder {}; I'm not sure about the functions. Single functions should be defined almost like what you already have except that there would be many placeholder types. groups of functions like random_access_iterator need to be made possible. template<class T> struct random_access_iterator : compound_concept<...> {}; A similar effect could be achieved by simply putting a boost::tuple in a dynamic_any::any. The advantage of this method is to allow individual objects to be copied independently. I'm mostly wondering whether a significant proportion of the uses of multimethods could be handled in this way. >> > Would such a class be useful? >> > Any better ideas for the interface? >> > >> > The big problem is the amount of metaprograming needed. >> > 10 operations were more than msvc 7.1 could handle with >> > my version of dynamic_any::any<> and this is much worse. >> > Definitely. I think, it this case we should find a good balance > between compile-time and runtime. I don't like an interface where > functions for different arguments variantions are registred at > runtime, but if there is no other solution, I can accept it. But in > this case it would be better to start with multimethods library and > then use it for dynamic_any. Originally, I wanted to get close to > untyped languages where you can multiply numbers and strings and > things like this. This means that you have a limited set of types > (bool, integers, floats, chars, strings and references to objects). > This set can be bigger in C++ because you may want to handle > references to different base classes differently but it's still, I > thought, can be enumerated in one place. All combinations of 20 types > gives 400 variants. It's big for mpl::vector but I believe modern > compilers can process typelists of this length if a library is > carefully crafted. If the number of types is really fixed then variant would be a better solution, I would think. The method I suggested before: template<class Operation, class T> struct overload; allows all the variations associated with T to be loaded the first time the constructor of dynamic_any::any runs. Probably to make the lookup efficient for large numbers of functions, some dynamic loading would be needed anyway (unless there is some trick I haven't heard of for getting a unique integer from a type at compile time). What I currently have is not very efficient. It takes about 60 ns. per dispatch for all possible combinations of a ternary function with 4 types (a total of 64). Compare that to the single dispatch case which only takes about 6 ns. In Christ, Steven Watanabe

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Re: [boost] using lambda's pointer to member function and, boost::function
by Steven Watanabe 30 Nov '06

30 Nov '06

AMDG "Rodolfo Lima" wrote: > >> try boost::lambda::bind(&aux::a, _1, x); > Thanks for your advice, but that's not the kind of solution that I'm looking > for. There are some constraints > on aux that forbids me to use bind. Please read the thread > http://lists.boost.org/boost-users/2006/11/23754.php where I explain the > whole situation. > Ok. how about boost::lambda::bind<int>(&_1->*&aux::a, x)? > Thanks, > Rodolfo Lima. > In Christ, Steven Watanabe

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Boost regression notification (2006-11-30 [RC_1_34_0])
by Douglas Gregor 30 Nov '06

30 Nov '06

Boost Regression test failures Report time: 2006-11-30T12:49:52Z 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… 73 failures in 10 libraries concept_check (22) iostreams (13) math (8) random (1) serialization (7) signals (4) statechart (8) test (8) utility (1) xpressive (1) |concept_check| class_concept_fail_expected: borland-5.6.4 borland-5.8.2 hp_cxx-71_006_tru64 intel-vc8-win-9.1 msvc-6.5 msvc-7.0 msvc-7.1 msvc-8.0 msvc-8.0 qcc-3.3.5_cpp qcc-3.3.5_gpp concept_check_fail_expected: borland-5.6.4 borland-5.8.2 hp_cxx-71_006_tru64 intel-vc8-win-9.1 msvc-6.5 msvc-7.0 msvc-7.1 msvc-8.0 msvc-8.0 qcc-3.3.5_cpp qcc-3.3.5_gpp |iostreams| bzip2_test: msvc-7.1 msvc-7.1 msvc-8.0 msvc-8.0 finite_state_filter_test: cw-9.4 gzip_test: msvc-7.1 msvc-7.1 msvc-8.0 msvc-8.0 zlib_test: msvc-7.1 msvc-7.1 msvc-8.0 msvc-8.0 |math| common_factor_test: borland-5.8.2 cw-9.4 msvc-6.5 msvc-7.0 msvc-7.1 msvc-8.0 qcc-3.3.5_cpp qcc-3.3.5_gpp |random| random_test: intel-linux-9.0 |serialization| test_no_rtti_xml_archive_dll: qcc-3.3.5_gpp test_reset_object_address: msvc-7.0 test_reset_object_address_dll: msvc-7.0 test_variant_xml_archive: borland-5.8.2 test_variant_xml_archive_dll: borland-5.8.2 test_variant_xml_warchive: borland-5.8.2 test_variant_xml_warchive_dll: borland-5.8.2 |signals| deletion_test: msvc-6.5 ordering_test: msvc-6.5 signal_n_test: msvc-6.5 trackable_test: msvc-6.5 |statechart| FifoSchedulerTestBoth: msvc-7.1 msvc-8.0 FifoSchedulerTestNative: msvc-7.1 msvc-8.0 FifoSchedulerTestNormal: msvc-7.1 msvc-8.0 FifoSchedulerTestRelaxed: msvc-7.1 msvc-8.0 |test| prg_exec_fail1: intel-vc71-win-9.1 intel-vc8-win-9.1 msvc-6.5 msvc-7.0 msvc-8.0 prg_exec_fail2: darwin-4.0.1 prg_exec_fail3: cw-9.4 test_fp_comparisons: cw-9.4 |utility| operators_test: gcc-3.4.5_linux_x86_64 |xpressive| test3u: qcc-3.3.5_cpp

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Boost inspection notification (2006-11-30/RC_1_34_0) *X*
by Rene Rivera 30 Nov '06

30 Nov '06

Boost Inspection Report Run Date: 17:04:52 UTC, Thursday 30 November 2006 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: 11421 files scanned 890 directories scanned (including root) 242 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 175 broken links 21 unlinked files 7 file/directory names issues 1 files with tabs 0 violations of the Boost min/max guidelines 35 usages of unnamed namespaces in headers (including .ipp files) Summary: archive (3) bind (1) boost-root (1) build (2) date_time (1) doc (2) filesystem (37) graph (3) inspect (1) interprocess (1) iostreams (4) lambda (4) more (66) mpl (1) multi_array (2) numeric (1) parameter (2) program_options (1) ptr_container (1) python (7) regex (1) regression (14) serialization (1) signals (1) test (81) tuple (1) type_traits (1) utility (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/html/signals.html |build| tools/build/v2/example/make/main.cpp.pro: *N* name contains more than one dot character ('.') 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| boost/graph/maximum_cardinality_matching.hpp: *N* name exceeds 31 characters libs/graph/doc/lengauer_tarjan_dominator_tree.htm: *N* name exceeds 31 characters libs/graph/doc/sorted_erdos_renyi_generator.html: *N* name exceeds 31 characters |inspect| tools/inspect/index.html: *A* broken link: build/Jamfile |interprocess| libs/interprocess/index.html: *A* broken link: doc/html/index.html |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 libs/lambda/doc/index.html: *A* broken link: ../../LICENSE_1_0.txt |more| more/getting_started.html: *A* broken link: ../Jamfile *A* broken link: ../tools/build/v1/borland-tools.html *A* broken link: ../tools/build/v1/build_system.htm *A* broken link: ../tools/build/v1/build_system.htm#build *A* broken link: ../tools/build/v1/como-tools.html *A* broken link: ../tools/build/v1/cw-tools.html *A* broken link: ../tools/build/v1/darwin-tools.html *A* broken link: ../tools/build/v1/dmc-stlport-tools.html *A* broken link: ../tools/build/v1/dmc-tools.html *A* broken link: ../tools/build/v1/edg-tools.html *A* broken link: ../tools/build/v1/gcc-nocygwin-tools.html *A* broken link: 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../tools/build/v1/vc7-tools.html more/version_history.html: *A* broken link: ../tools/build/v1/intel-linux-tools.html *A* broken link: ../tools/build/v1/intel-win32-tools.html *A* broken link: ../tools/build/v1/msvc-stlport-tools.html |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 |numeric| libs/numeric/conversion/index.html: *A* broken link: ../../LICENSE_1_0.txt |parameter| libs/parameter/doc/html/python.html: *A* broken link: tag::x(int *A* broken link: tag::y*(int |program_options| libs/program_options/doc/index.html: *A* broken link: ../.../../LICENSE_1_0.txt |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 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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 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Boost inspection notification (2006-11-30/RC_1_34_0) *LC*
by Rene Rivera 30 Nov '06

30 Nov '06

Boost Inspection Report Run Date: 17:05:14 UTC, Thursday 30 November 2006 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: 11421 files scanned 890 directories scanned (including root) 1132 problems reported Problem counts: 736 files missing Boost license info or having wrong reference text 396 files missing copyright notice Summary: any (1) archive (1) array (1) boost-root (4) boostbook (2) build (58) compatibility (2) concept_check (22) conversion (5) detail (4) disjoint_sets (2) doc (2) filesystem (2) format (8) function (1) functional (8) inspect (1) integer (9) iostreams (2) lambda (10) libs (6) logic (2) math (1) more (30) mpl (419) multi_array (13) numeric (198) optional (1) people (10) pool (30) program_options (35) property_map (15) ptr_container (8) python (6) quickbook (11) random (20) rational (5) regex (4) regression (64) release (2) serialization (16) smart_ptr (8) test (5) timer (1) tokenizer (9) tr1 (2) tuple (5) utility (19) variant (42) Details: *L* missing Boost license info, or wrong reference text *C* missing copyright notice |any| libs/any/doc/ any.xml: *L* |archive| 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[test][cw] problems with __declspec() in floating_point_comparison.hpp
by Joaquín Mª López Muñoz 30 Nov '06

30 Nov '06

CW 9.4 fails to compile floating_point_comparison.hpp (see http://tinyurl.com/ybzaze ) because of line 36: enum BOOST_TEST_DECL floating_point_comparison_type { where BOOST_TEST_DECL resolves to __declspec(dllimport) or __declspec(dllexport) depending on the context. Seemingly, this compiler does not support __declspec applied to enum types --usage with classes and functions is supported, though. The obvious workaround is to replace the offending line with #if BOOST_WORKAROUND(__MWERKS__,BOOST_TESTED_AT(0x3205)) enum floating_point_comparison_type { #else enum BOOST_TEST_DECL floating_point_comparison_type { #endif Is it OK for me to commit this change to the HEAD and RC_1_34_0? Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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[lambda] Wrong return type for dereference for pointer to member
by Rodolfo Lima 30 Nov '06

30 Nov '06

Lambda's return type deduction for a pointer to member action doesn't honour the object constness. Regardless of the object constness, the return type is always a non const reference to the member type. The following code illustrates the issue: struct aux { aux() : b(1) {} int b; }; struct aux_ptr { aux_ptr(aux *ptr=NULL) : m_ptr(ptr) {} ~aux_ptr() { delete m_ptr; } template <class R> R &operator->*(R aux::*m) { return m_ptr->*m; } template <class R> const R &operator->*(R aux::*m) const { return m_ptr->*m; } private: aux *m_ptr; }; int main() { // This compiles nicely aux_ptr ptr(new aux()); cout << (_1->*&aux::b)(ptr) << endl; // This fails to compile. const aux_ptr cptr(new aux()); cout << (_1->*&aux::b)(cptr) << endl; return 0; } The second part should compile if other_action<member_pointer_action> honoured _1's constness. Thanks, Rodolfo Lima

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[math] [PING] common_factor_test
by Vladimir Prus 30 Nov '06

30 Nov '06

The math's library common_factor_test still fails on 3 platforms due to problems in the test itself. John's posted a patch, but it's not checked in yet, as far I can tell. Daryle, would it be possible to you to look at the patch ASAP? If you're out of time at the moment, perhaps we can trust John's judgement on portability issues and check the patch in right away? Thanks, Volodya

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[ptr_container] and [multi_index] ?
by Janek Kozicki 30 Nov '06

30 Nov '06

Hi, Is it possible to use those two together? I'm considering storing my polymorphic stuff into ptr_container but vector (or other standard containers) are not enough for my needs. Using Boost.MultiIndex with Boost.PtrContainer would be great. -- Janek Kozicki |

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Asio: very strange problem
by berserker_r 29 Nov '06

29 Nov '06

I'm still trying to implement a multithreaded http server with asio: the problem I have reported in the past about IOCP looks fixed but now I'm falling in another one...If you try the following example it will works well with IE6 and Opera 9 but not with Firefox 2.0 (it always detect an aborted connection). To make it works with Firefox just uncomment the "Sleep(0)". Obiously I don't think that the problem is related to Firefox, but I cannot understand why it works well with others browsers... class Session { public: Session(boost::asio::io_service &service) : m_socket(service) { } ~Session() { m_socket.close(); } boost::asio::ip::tcp::socket & socket() { return m_socket; } void run() { //Sleep(0); // Uncomment this line to make it works in Firefox m_socket.async_read_some(boost::asio::buffer(m_buffer), boost::bind(&Session::read_handler, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } void read_handler(const boost::system::error_code &e, size_t bytes_transferred) { if(!e) { static int counter = 0; std::stringstream stream; stream << "<html><body><h2>Hello" << ++counter << "</h2></body></html>"; m_response = stream.str(); boost::asio::async_write(m_socket, boost::asio::buffer(m_response), boost::bind(&Session::write_handler, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } } void write_handler(const boost::system::error_code &e, size_t bytes_transferred) { delete this; } private: boost::asio::ip::tcp::socket m_socket; boost::array<char, 8192> m_buffer; std::string m_response; }; class Server { public: Server(int port) : m_service(), m_acceptor(m_service) { boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), port); m_acceptor.open(endpoint.protocol()); m_acceptor.bind(endpoint); m_acceptor.listen(); accept(); } void accept() { Session *connection = new Session(m_service); m_acceptor.async_accept(connection->socket(), boost::bind(&Server::accept_handler, this, boost::asio::placeholders::error, connection)); } void run(int threads = 10) { boost::thread_group threads_pool; while(threads-- > 0) threads_pool.create_thread(boost::bind(&boost::asio::io_service::run, &m_service)); m_service.run(); } void accept_handler(const boost::system::error_code &e, Session *connection) { if(!e) { connection->run(); accept(); } } protected: boost::asio::io_service m_service; boost::asio::ip::tcp::acceptor m_acceptor; }; int main(int argc, char **argv) { Server server(7070); server.run(); return 0; }

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