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[typeof]Typeof with MinGW
by Minmin Gong 24 May '07

24 May '07

Hi all. Does Boost.Typeof work with MinGW in a little complex situation? I test it with this: #include <boost/typeof/typeof.hpp> #include <vector> using namespace std; int main() { std::vector<int> v; BOOST_TYPEOF(v)::value_type i; } It failed. But if the line 9 is changed from BOOST_TYPEOF(v)::value_type i; to typedef BOOST_TYPEOF(v) v_type; v_type::value_type i; It works. My question is why BOOST_TYPEOF(v)::value_type is not supported? I'm using MinGW with gcc 4.1.2. (3.4.2 fails too. But vc8 is OK.) Thanks.

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Re: [boost] [Boost-users] [Serialization] Thread-unsafe singleton
by Sohail Somani 24 May '07

24 May '07

To those of us just joining the thread (boost developers list), we are discussing the use of Myers Singleton in the Boost.Serialization code and it's ramifications for thread-safety. You can see the thread here: http://thread.gmane.org/gmane.comp.lib.boost.user/27457 On Wed, 2007-05-23 at 22:38 -0700, Robert Ramey wrote: > Sohail Somani wrote: > > > I can develop a patch using boost once that I think would work. > > Locally, > > I'm going to have to do this anyway. Fortunately, my test has ceased > > to > > fail so I can't test it. To make it as "pay for what you use", one can > > #ifdef it out if they have special knowledge of the platform/compiler. > > > > OK - you've convinced me there could be a problem. > > I don't see a magic bullet solution. I think users need a couple of > options and a good explanation in the manual. > > Options > > a) don't use export - use explicit archive level registration instead. > b) some sort of explicit type registration. Users could just put > at after the main entry point and/or in the DLL loading phase How is (b) different from (a)? Is this related to your "load/save by name?" > c) an automatic method using thread safety primitives - maybe > there are some small ones. Then you have the *#ifdef ... There is a very small one ;-) The idea is here (copied and tweaked to protect the innocent - may not compile): // thread-safe lazily initialized singleton template<typename T> struct singleton { public: static T & instance() { boost::call_once(call_once,once_); // the magic happens here return get_instance(); } private: <*structors>; // call_once *MUST* be called before calling this function static T & get_instance() { static T object; return object; } static void call_once() { get_instance(); } static boost::once_flag once_; }; // guaranteed to be called before main since it uses initialization // with a constant expression (3.6.2.1) - language lawyers help please. // Also, what happens with dlopen'ish stuff???? This is heavily platform // specific. Someone save us from this mess. template<typename T> boost::once_flag singleton<T>::once_ = BOOST_ONCE_INIT; Then usage would be something like: static extended_type_info * get_instance() { return &(singleton<extended_type_info_typeid_1<T> >::instance()); } > The main obstacle is that requires a detailed understandable > explanation along with examples - a fair amount of work. Note > that this really applies to all extended type info systems so > the explanation is even more complex. Well I would have to rely on you to tell me where we need to apply the fixes. I would be happy to add some documentation to a patch against 1.34. > And once embarks upon this kind of effort, its interesting > to consider "finishing" extended type info with some missing > functionality like "construct from export name". I have no idea why the two affect each other! > It would also be interesting to investigate if there is some > sort of lock free solution - At least on some compilers/ > processors. I'm not going to touch lock-free lazily initialized singletons! I'd rather have my code work ;-) > Just goes to show that no good idea goes unpunished. :-) > SOOO I'm am positive about the idea. However, like most > good ideas, its a lot bigger than it first appears. Don't see why myself. In multi-threaded builds of serialization, we link with Boost.Thread and use boost::once. > Having written this, it would seem that this is territory > well traveled by those working on a good Singleton > suitable for such a purpose. I've worked on the above singleton, tested it on a few x86 OSes and it seems to work. But I would be very happy if someone has a better solution that is tested. > (Amazingly, I don't even know if boost has such a thiing) > Ideally, I would just like to use that (assuming it doesn't > import everything on planet earth). I believe that Boost has everything you need for a *correct* solution. Sohail

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syntax highlighting for C++, Build v2 and QuickBook
by Matias Capeletto 24 May '07

24 May '07

Hello, boost::hs is a syntax highlighting for C++, doxygen, Boost.Build jamfiles and QuickBook. It is designed to work with Katepart, so it can be used in KWrite, Kate, Konqueror and KDevelop. Online docs and download link at: http://tinyurl.com/2l7u33 I have been using it in the development of Boost.Bimap and it makes my life a lot easier, specially when working with quickbook files. Some of the features * Support for C++ source code, including the standard library, some boost libraries, doxygen support, quickbook code import construct. * Support for Boost.Build v2 jamfiles * Support for Quickbook 1.4 * In general support for autocomment and region folding Comments are welcome. Do you think it belong somewhere in boost? Best regards Matias

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[interprocess] Condition variables and a recursive mutex
by dherring＠ll.mit.edu 24 May '07

24 May '07

Hi, I think there's a minor mistake in the template code for interprocess_condition::wait. ***** Begin example ***** using namespace boost::interprocess; #ifdef USE_RECURSIVE typedef interprocess_recursive_mutex MutexT; #else typedef interprocess_mutex MutexT; #endif MutexT mutex; scoped_lock<MutexT> lock(mutex); interprocess_condition condition; condition.wait(lock); // compilation error when USE_RECURSIVE is defined ***** End example ***** Here, wait() is templated on the lock type; but this calls do_wait(), which requires interprocess_mutex. Is there a reason why do_wait() cannot accept a recursive mutex? The attached diff contains one possible solution: - Template do_wait() on the mutex type. - Add "friend class interprocess_condition" to the recursive mutex (as it is in the nonrecursive mutex). This seems to work on my computer (with POSIX_SHARED_MEMORY_OBJECTS); it has't been tested with the POSIX emulation. Thanks, Daniel

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Boost inspection notification (2007-05-24/RC_1_34_0) *LC*
by Rene Rivera 24 May '07

24 May '07

Boost Inspection Report Run Date: 16:05:29 UTC, Thursday 24 May 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: 11453 files scanned 909 directories scanned (including root) 1059 problems reported Problem counts: 661 files missing Boost license info or having wrong reference text 398 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 (417) multi_array (13) numeric (188) optional (1) people (4) program_options (35) property_map (15) ptr_container (8) python (14) 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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*L* check_existance.py: *C* *L* checked_system.py: *C* *L* libxslt.py: *C* *L* log.py: *C* *L* makedirs.py: *C* *L* send_mail.py: *C* *L* sourceforge.py: *C* *L* tar.py: *C* *L* zip.py: *C* *L* tools/regression/xsl_reports/xsl/v2/ expected_to_1_33_format.xsl: *C* *L* |release| tools/release/ utils.py: *C* *L* |serialization| libs/serialization/doc/ style.css: *C* *L* libs/serialization/example/ demo_output.txt: *C* *L* demo_save.xml: *C* *L* demofile.txt: *C* *L* libs/serialization/test/ run_archive_test.bat: *C* *L* runtest.bat: *C* *L* runtest.sh: *C* *L* libs/serialization/vc7ide/ readme.txt: *C* *L* |signals| libs/signals/doc/ tutorial.xml: *C* *L* |smart_ptr| libs/smart_ptr/ compatibility.htm: *L* scoped_array.htm: *L* scoped_ptr.htm: *L* shared_array.htm: *L* shared_ptr.htm: *L* smart_ptr.htm: *L* smarttests.htm: *L* weak_ptr.htm: *L* |test| boost/test/utils/runtime/cla/detail/ argument_value_usage.hpp: *L* libs/test/test/auto-link-test/ run_bjam.bat: *C* *L* |timer| libs/timer/ 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1 0

Boost inspection notification (2007-05-24/RC_1_34_0) *X*
by Rene Rivera 24 May '07

24 May '07

Boost Inspection Report Run Date: 16:05:23 UTC, Thursday 24 May 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: 11453 files scanned 909 directories scanned (including root) 192 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 101 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 (1) build (1) date_time (1) doc (2) filesystem (33) graph (2) iostreams (2) lambda (3) math (8) more (4) mpl (4) multi_array (2) ptr_container (1) python (8) 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/details.html#changes |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: operations.htm#create_directory *A* broken link: operations.htm#create_hard_link *A* broken link: operations.htm#current_path *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#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 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/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/cvs.html: *A* unlinked file more/getting_started/unix-variants.html: *A* broken link: ../../doc/html/thread/build.html#thread.build more/getting_started/windows.html: *A* broken link: ../../doc/html/thread/build.html#thread.build 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 libs/mpl/doc/refmanual/for-each.html: *A* broken link: ./value-initialized.html |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: ../index.htm 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 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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 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GSoC project "Visualization of STLContainers as SVG" - setting options using << or .axis_color(red).title_font(14)...
by Paul A Bristow 24 May '07

24 May '07

1 It seems nice to be able to create a one-stop visualisation of a container, for example: std::vector<double> my_data_structure; // fill with my data... my-graph << my_data_structure; // But should the myriad of graph plotting *options* be set using operator << allowing them to be chained together thus my_graph << line_color(black) << point_color(blue) << x_range(-10, 10) << y_range(0, 5)...; as suggested by John Maddock (who has a most irritating habit of being right ;-) or more conventional setter member functions my_graph.line_color(black); my_graph.point_color(blue); my_graph.x_range(-10, 10); my_graph.y_range(0, 5); and could getter versions return their current values if (my_graph.line_color() == black) .... possibly chained (return this) to reduce typing? http://www.parashift.com/c++-faq-lite/references.html#faq-8.4 my_graph.line_color(black).point_color(blue).x_range(-10, 10).y_range(0, 5); 2 How can a set of plot settings be 'saved' for repeated use? Once one has chosen a plot style, line_color black, point_color blue ..., one wants to save this for re-use (though things like the range may change). 3 Does anyone have experience with auto-axis scaling algorithms. The best reference I have found is Michael Bramley, C/C++ Users journal, www.cuj.com July 2000, pp 20 - 26 But this does not always give the nicest scales - it would work nicely using decimal, but the damned binary FP *wrong* bits at the end screw up the comparisons. (Excel plots show this behaviour). Suggestions? Paul --- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539561830 & SMS, Mobile +44 7714 330204 & SMS pbristow(a)hetp.u-net.com

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Re: [boost] Slots and signals: Listening to a value
by Johan Torp 24 May '07

24 May '07

> Date: Wed, 23 May 2007 17:48:20 -0400 > From: Edward Diener <eldiener(a)tropicsoft.com> > Your idea is essentially a 'property' whose change in value triggers a > notification event. Both Java and dotnet have such functionality > combined with the idea of Javabean properties in the former and dotnet > component properties in the latter. Do you have any links describing .NET and Javas implementations? I've googled a bit and have been able to find some information but no proper reference or rationale. > I have worked on my own with the idea of a C++ 'property', but not with > enough personal satisfaction to put it in the sandbox or submit it to > Boost. Reece Dunn, I believe, has submitted his own idea of a C++ > 'property' as an implementation to the sandbox in the past. Obviously > notifiers as events can be built into the idea of a C++ 'property' > whenever the property changes and Java goes so far as to actually build > into their idea of a Javabeans 'property' the idea of being able to > cancel the change before it happens by an event ( signal ) listener ( > slot ). I had a quick glance at these and I believe that this is not what I'm looking for. Properties are exposed member variables, I do not believe it is a good idea to expose members. The typical usage for this class, let's call it observable_value, is: class logic_class { const observable_value<bool>& GetSomeState() const; const observable_value<money_class>& GetCredits() const; }; Setters needn't be supplied and if they are, they can do more things than just setting an internal observable_value variable. > I do not think the idea of an event whenever a 'property' changes should > be part of the signals library itself but it can, and should IMO, use > the signals library whenever the change occurs. I think the idea itself > of a signalled 'property' change belongs in its own separate > implementation, since the signals library is sufficient enough providing > just the notion of signals and slots ( or events and handlers as others > may call it ). This is probably a better idea. This simple class could, with a lot of work, be extended into a library which could support the standard collections and other user defined value types as long as all non-const methods are wrapped to detect state changes. I.e. we would need to implement a non-const wrapper iterator for STL collections.

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Re: [boost] Slots and signals: Listening to a value
by Johan Torp 24 May '07

24 May '07

Jared McIntyre <jmcintyre <at> dfsoftware.com> writes: >I'd rather have the overloads. I was actually playing around with something >similar recently, and that is how I was doing it. As for explicitly telling >the user that they will be sending a message with the set call, I don't think >set really tells you anymore as a user than = about how messaging is occurring. >Further, as a setter of a value, I rarely care whether an event will be sent or >not. I only care about that when I am also the receiver of the message, but at >that point I should already know they are tied together, since I hooked into the >slot. Hmm, maybe you're right. I guess get and set should be removed and replaced then. Do you think this is general and useful enough to be included in boost slots and signals? Best Regards, Johan Torp

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Re: [boost] Slots and signals: Listening to a value (Jared McIntyre)
by Johan Torp 24 May '07

24 May '07

> Date: Wed, 23 May 2007 17:29:12 +0000 (UTC) > From: Jared McIntyre <jmcintyre(a)dfsoftware.com> > > I can't really say whether it belongs in the slots and signals library, but it > certainly has a great deal of utility. It would be particularly interesting if > you could figure out a way to expose other operators if they were supported by > the wrapped type. So if it is a number, you could do +=, etc. I think this is doable. Free functions such as operators will work automatically thanks to implicit type conversion. Explicit type conversion to an observable_value, let's call it that for now, shold be disabled by makin the constructor explicit. Any other thoughts on what might be wanted for such a library?

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