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Re: [boost] FW: Suggestion for boost`s smart pointers
by Sohail Somani 03 Dec '06

03 Dec '06

> -----Original Message----- > From: boost-bounces(a)lists.boost.org > [mailto:boost-bounces@lists.boost.org] On Behalf Of Howard Hinnant > > I wouldn't really need the extra indirection that seems to > be implied > > there but that's a step in the right direction. > > <nod> Agreed. The indirection is in there really only because you > said "C". The deleter type can easily be a C++ class type which can > then do anything you want. Yes, it turns out I read your code wrong. I was thinking that was the signature for a something that would construct a tr1::function eventually. Been so long since I mucked around with function pointers :) Thankfully.

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Re: [boost] Geometry/Vec lib swizzle syntax prototype
by Steven Watanabe 03 Dec '06

03 Dec '06

AMDG "Michael Fawcett" wrote: > I just implemented it locally. There are probably better ways. In > particular I dislike the static variable, but I'm not sure how one > could do away with it. Ideas are welcome! > > template <typename X, typename Y, typename Z, typename W> > struct vec4; > > namespace detail > { > > template <typename X, typename Y = X, typename Z = Y, typename W = Z> > struct address_of_dispatch > { > X *operator()(vec4<X, Y, Z, W> &rhs) const { return rhs.array(); } > const X *operator()(const vec4<X, Y, Z, W> &rhs) const { return rhs.array(); } > }; > template <typename X, typename Y, typename Z, typename W> > struct address_of_dispatch<X &, Y &, Z &, W &> > { > X *operator()(vec4<X &, Y &, Z &, W &> &rhs) const > { > static vec4<X, Y, Z, W> nrv; > nrv = rhs; > return nrv.array(); > } > const X *operator()(const vec4<X &, Y &, Z &, W &> &rhs) const > { > return (*this)(const_cast<vec4<X &, Y &, Z &, W &> &>(rhs)); > } > }; > > } > > // Inside vec4's definition > typename boost::remove_reference<X>::type *operator&(void) > { > return detail::address_of_dispatch<X, Y, Z, W>()(*this); > } > typename boost::remove_reference<X>::type const *operator&(void) const > { > return detail::address_of_dispatch<X, Y, Z, W>()(*this); > } > > That works...whether it's the best solution is another story... > Well, even whether it works is debatable. template<class X> void do_stuff(X*, X*); template<class X, class Y, class Z, class W> void f(vec4<X, Y, Z, W>&, vec4<X, Y, Z, W>&) { do_stuff(&arg1, &arg2); } > I'll update the Vault files to include these changes. Thanks for > bringing this issue up! > > --Michael Fawcett > In Christ, Steven Watanabe

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Boost inspection notification (2006-12-02/RC_1_34_0) *X*
by Rene Rivera 02 Dec '06

02 Dec '06

Boost Inspection Report Run Date: 17:07:46 UTC, Saturday 02 December 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: 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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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Boost inspection notification (2006-12-02/RC_1_34_0) *LC*
by Rene Rivera 02 Dec '06

02 Dec '06

Boost Inspection Report Run Date: 17:07:56 UTC, Saturday 02 December 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) 1100 problems reported Problem counts: 712 files missing Boost license info or having wrong reference text 388 files missing copyright notice Summary: any (1) archive (1) boost-root (1) boostbook (2) build (58) concept_check (22) conversion (5) filesystem (2) function (1) 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 (8) 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| boost/archive/detail/ utf8_codecvt_facet.hpp: *L* |boost-root| / rst.css: *L* |boostbook| tools/boostbook/xsl/ fo.xsl: *C* *L* |build| tools/build/v2/build/ build-request.jam: *L* modifiers.jam: *L* tools/build/v2/doc/ Jamfile.v2: *C* *L* tools/build/v2/doc/src/ advanced.xml: *C* *L* architecture.xml: *C* *L* catalog.xml: *C* *L* extending.xml: *C* *L* faq.xml: *C* *L* howto.xml: *C* *L* install.xml: *C* *L* recipes.xml: *C* *L* reference.xml: *C* *L* standalone.xml: *C* *L* tutorial.xml: *C* *L* userman.xml: *C* *L* tools/build/v2/example/python_modules/ python_helpers.jam: *C* *L* python_helpers.py: *C* *L* tools/build/v2/test/ abs_workdir.py: *C* *L* dependency_property.py: *L* dependency_test.py: *C* *L* direct_request_test.py: *C* *L* dll_path.py: *L* double_loading.py: *L* duplicate.py: *L* echo_args.jam: *C* *L* empty.jam: *C* *L* expansion.py: *L* explicit.py: *L* gcc_runtime.py: *L* tools/build/v2/test/project-test3/lib3/ Jamfile: *C* *L* tools/build/v2/test/ readme.txt: *C* *L* svn_tree.py: *L* tag.py: *L* test_system.html: *L* tools/build/v2/tools/ sun.jam: *L* 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Boost regression notification (2006-12-02 [RC_1_34_0])
by Douglas Gregor 02 Dec '06

02 Dec '06

Boost Regression test failures Report time: 2006-12-02T13:39:41Z 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… 31 failures in 9 libraries concept_check (8) iostreams (1) math (6) random (1) serialization (7) signals (4) test (2) utility (1) xpressive (1) |concept_check| class_concept_fail_expected: borland-5.6.4 borland-5.8.2 msvc-6.5 msvc-7.0 qcc-3.3.5_cpp qcc-3.3.5_gpp concept_check_fail_expected: qcc-3.3.5_cpp qcc-3.3.5_gpp |iostreams| finite_state_filter_test: cw-9.4 |math| common_factor_test: borland-5.8.2 cw-9.4 msvc-6.5 msvc-7.0 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 |test| prg_exec_fail2: darwin-4.0.1 prg_exec_fail3: cw-9.4 |utility| operators_test: gcc-3.4.5_linux_x86_64 |xpressive| test3u: qcc-3.3.5_cpp

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Re: [boost] Preliminary working prototypeofatomic_shared--multithreaded wrapper for shared_ptr.
by Talbot, George 02 Dec '06

02 Dec '06

> Chris Thomasson wrote: > > Sent: Wednesday, November 22, 2006 11:32 PM > To: boost(a)lists.boost.org > Subject: Re: [boost] Preliminary working prototypeofatomic_shared-- > multithreaded wrapper for shared_ptr. > > "Talbot, George" <Gtalbot(a)locuspharma.com> wrote in message > news:acfee74296c36aa7458ec7c5580b0b9c4564c67b@locuspharma.com... > > Hi, > > > I've attached to this e-mail a working prototype of a wrapper for > > shared_ptr that uses a spinlock so that the shared_ptr may be updated > > atomically from multiple threads. For example, two threads can both > > attempt to set the value of the same shared_ptr, and the last one will > > win. This wrapper includes a "compare_and_set" method for performing > > lock-free-style "read, copy, attempt swap, repeat" updating to a data > > structure, though, of course because the wrapper uses a spinlock, it > > isn't truly lock free. > > I suggest you take a look at a mostly lock-free implementation: > > http://appcore.home.comcast.net/vzoom/refcount/ > > Your wrapper uses the spinlock when it doesn't have to... A swap and a cas > to shared locations that contain pointers to the refcount > object do not need to be locked... I know. I was just doing a simple prototype first that has the interface that I want. I figure if I get everything working with the simple stupid spinlock, then I can go back and re-work with atomic operations. > Weak reference count modifications do not need to be > locked... That's good to know. > You don't need to use DWCAS either... Don't I need to do that for assignment and compare_and_set for the actual shared_ptr<>, since it's two words? (pointer to object and pointer to refcount.) This is good feedback. Thank you for the help. -- George T. Talbot gtalbot(a)locuspharma.com

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[asio] Error handling. Revisited
by Oleg Abrosimov 02 Dec '06

02 Dec '06

Hello, I've read asio docs and was really impressed by this library's design. Thank you Christopher for this contribution. However, error handling was very annoying through all examples. Consider handle_read_body function from chat_client.cpp: void handle_read_body(const boost::asio::error& error) { if (!error) { std::cout.write(read_msg_.body(), read_msg_.body_length()); std::cout << "\n"; boost::asio::async_read(socket_, boost::asio::buffer(read_msg_.data(), chat_message::header_length), boost::bind(&chat_client::handle_read_header, this, boost::asio::placeholders::error)); } else { do_close(); } } It is a common idiom in current asio lib: void some_handler(const boost::asio::error& error) { if (!error) { // asynchronous operation succeed } else { // asynchronous operation failed } } This reminds me the motivation for the Null Object pattern: The object has a trivial state that should be checked explicitly in every method. It is often better to apply the degenerated case of the State pattern (The Null Object pattern) and eliminate all this annoying checks in object's methods. If we apply this to asio's async* methods, we should provide two handlers: first for success case and second for fail, for example: socket_.async_connect(endpoint, boost::bind(&chat_client::handle_connect, this), // success boost::bind(&chat_client::handle_connect_error, this, // fail boost::asio::placeholders::error, ++endpoint_iterator)); I've reworked the chat_client.cpp example with an assumption that such a two-handlers methods are provided and the result is below. I want to ask people in this list if they like this approach better, or not? class chat_client { public: chat_client(boost::asio::io_service& io_service, tcp::resolver::iterator endpoint_iterator) : io_service_(io_service), socket_(io_service) { do_async_connect(endpoint_iterator); } void write(const chat_message& msg) { io_service_.post(boost::bind(&chat_client::do_write, this, msg)); } void close() { io_service_.post(boost::bind(&chat_client::do_close, this)); } private: void handle_connect() { do_async_read_header(); } void handle_connect_error(const boost::asio::error& /*error*/, tcp::resolver::iterator endpoint_iterator) { if (endpoint_iterator != tcp::resolver::iterator()) { do_close(); do_async_connect(endpoint_iterator); } } // helper function to eliminate code duplication void do_async_connect(tcp::resolver::iterator endpoint_iterator) { tcp::endpoint endpoint = *endpoint_iterator; socket_.async_connect(endpoint, boost::bind(&chat_client::handle_connect, this), boost::bind(&chat_client::handle_connect_error, this, // Note there boost::asio::placeholders::error, ++endpoint_iterator)); } void handle_read_header() { if (read_msg_.decode_header()) { boost::asio::async_read(socket_, boost::asio::buffer(read_msg_.body(), read_msg_.body_length()), boost::bind(&chat_client::handle_read_body, this), boost::bind(&chat_client::do_close, this)); // Note there } else { do_close(); } } void handle_read_body() { std::cout.write(read_msg_.body(), read_msg_.body_length()); std::cout << "\n"; do_async_read_header(); } // helper function to eliminate code duplication void do_async_read_header() { boost::asio::async_read(socket_, boost::asio::buffer(read_msg_.data(), chat_message::header_length), boost::bind(&chat_client::handle_read_header, this), boost::bind(&chat_client::do_close, this)); // Note there } void do_write(chat_message msg) { bool write_in_progress = !write_msgs_.empty(); write_msgs_.push_back(msg); if (!write_in_progress) { do_async_write(); } } void handle_write() { write_msgs_.pop_front(); if (!write_msgs_.empty()) { do_async_write(); } } // helper function to eliminate code duplication void do_async_write() { boost::asio::async_write(socket_, boost::asio::buffer(write_msgs_.front().data(), write_msgs_.front().length()), boost::bind(&chat_client::handle_write, this), boost::bind(&chat_client::do_close, this)); // Note here } void do_close() { socket_.close(); } private: boost::asio::io_service& io_service_; tcp::socket socket_; chat_message read_msg_; chat_message_queue write_msgs_; };

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Re: [boost] boost::shared_ptr<>::compare_and_swap()--AmIinsaneforwanting this?
by Talbot, George 02 Dec '06

02 Dec '06

My mistake. So that seems like a bit of a useless guarantee--basically any structure constructed with shared_ptr can only be read by the same thread that's writing to the structure unless all of the pointer operations are guarded with a mutex or spinlock, right? Ignoring compare-and-swap, have you or anyone else experimented with using a spinlock (as you mentioned previously) to remove the above restriction? What would that do to performance and complexity? Could you use a compare-and-swap type of operation to implement read/write thread safety? -- George T. Talbot <gtalbot(a)locuspharma.com> > -----Original Message----- > From: boost-bounces(a)lists.boost.org [mailto:boost-bounces@lists.boost.org] > On Behalf Of Peter Dimov > Sent: Friday, November 10, 2006 10:16 AM > To: boost(a)lists.boost.org > Subject: Re: [boost] boost::shared_ptr<>::compare_and_swap()-- > AmIinsaneforwanting this? > > Talbot, George wrote: > > > I'm sorry if I'm being too dense here. I think a section in the > > documentation saying exactly what is guaranteed and what isn't would > > help a lot. > > Here you go: > > http://boost.org/libs/smart_ptr/shared_ptr.htm#ThreadSafety > > _______________________________________________ > Unsubscribe & other changes: > http://lists.boost.org/mailman/listinfo.cgi/boost

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[proposal] Rank List (old name: AVL Array) in the Sandbox Vault
by Martin Knoblauch Revuelta 02 Dec '06

02 Dec '06

- Hi again, I have uploaded Rank List (presented here as "AVL Array" in the message "[proposal] Sequence container with O(log n) random access _and_ O(log n) insertion/removal (wherever)") to the Sandbox Vault. I've made a lot of changes, but the main one is the documentation: http://boost.cvs.sourceforge.net/*checkout*/boost-sandbox/boost-sandbox/lib… You will notice that I've kept all the features of the first proposal. I still believe that they are useful and they sould be maintained (the rationale explains why). As I said, I will remove them if this is the general desire in Boost. Please, could you first take a look to the docs (overview, rationale and/or FAQ) and then answer the next questions? A) Would you add Rank List to Boost? B) Do you suggest removing anything? I'd like to discuss the problem of tagging iterators as random access or just bidirectional. Thanks in advance, Martin

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Re: [boost] FW: Suggestion for boost`s smart pointers
by Sohail Somani 02 Dec '06

02 Dec '06

> -----Original Message----- > From: boost-bounces(a)lists.boost.org > [mailto:boost-bounces@lists.boost.org] On Behalf Of Howard Hinnant > Sent: Friday, December 01, 2006 5:02 PM > > I wouldn't really need the extra indirection that seems to > be implied > > there but that's a step in the right direction. > > <nod> Agreed. The indirection is in there really only because you > said "C". The deleter type can easily be a C++ class type which can > then do anything you want. Ah http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1856.html#Addit ion%20-%20Class%20template%20unqiue_ptr Thanks :)

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