3 * signal_impl::clear(): Don't clear the slot list during signal emission,
4 to prevent a segfault. And add a test for this.
5 (Kjell Ahlstedt) Bug #784550 (Andrejs Hanins)
6 * Remove signal_base::erase() and signal_impl::erase().
7 (Kjell Ahlstedt) Bug #784550
8 * Various minor code cleanups.
10 * Windows: Update the MS Visual Studio build.
16 - Use std::weak_ptr<signal_impl> in connected slots,
17 to avoid a memory leak.
18 (Kjell Ahlstedt) Bug #775871
19 - clear(): Really avoid erasing the slots prematurely.
21 * slot_rep: Make destructor, destroy, and clone() virtual,
22 instead of using function pointers that do the same thing.
23 (Kjell Ahlstedt) Bug #777618
26 * Visual Studio builds: Require Visual Studio 2017.
28 * Add tests/memleakcheck.sh, to run the tests under valgrind.
29 (Kjell Ahlstedt) Bug #775871
30 * Make --disable-benchmark work.
31 (Christophe Lermytte) Bug #774732
32 * Make silent builds really silent.
33 (Kjell Ahlstedt) Bug #768797
37 * connection, slot_base: Use an internal::weak_raw_ptr<> to simplify
40 * signal_base: Do not derive from trackable.
42 * slot_rep: Pass a slot_rep*, not notifiable*, to destroy().
44 * signal_impl: Do not derive from notifiable.
49 * signal: Remove slots() and the container that it returns,
50 and the iterator for that container.
51 See https://mail.gnome.org/archives/libsigc-list/2016-April/msg00009.html
52 * signal: connect(): Return a connection, instead of an iterator that
53 can be implicitly converted to a connection.
54 * Use std::shared_ptr<> for signal_impl reference-counting.
55 Instead of manual reference-counting.
56 (Murray Cumming) Bug #764935
57 * slot: Use unique_ptr<> to avoid direct call of destructor.
58 (Marcin Kolny) Bug #764935
59 * Add optional benchmark code, using boost::timer.
61 * Make some single-item constructors explicit.
63 * Make some member variables and methods private.
65 * Remove _ and __ prefixes on variables and parameters.
67 * Header guards: Remove leading underscores (and trailing underscores).
69 * limit_derived_target<T_Target>: Rename to limit_trackable_target<>
70 and visit_each_type<T_Type>() to visit_each_trackable() to make their purpose
76 * Functors (mem_functor, ptr_functor) no longer need to derive from a common
77 functor_base base class, and functors no longer need to have a result_type
79 * emitters and accumulators no longer need t ohave a result_type typedef or
81 * Remove now-unnecessary adaptor_type type aliases.
82 * Remove some more unused and unnecessary public type aliases.
86 * Minor documentation improvements.
88 * Make some constructors explicit.
90 * Some more minor uses of C++11 syntax.
92 * Remove unused SIGC_FUNCTORS_DEDUCE_RESULT_TYPE_WITH_DECLTYPE.
94 * Reformat code with clang-format.
99 * Correct the license of some header files from GPL to LGPL.
100 (Murray Cumming) Bug #763616 (Dominique Leuenberger)
104 * slots and signal: These should now be declared with the
105 sigc::slot<R(Args...)>
107 sigc::signal<R(Args...)>
108 syntax, like std::function<>.
109 Version 2.9/2.10 of libsigc++-2.0 supports both the old and new syntax.
111 * sigc::men_fun(): Take the instance by reference only.
115 This is the first release of the libsigc++-3.0 API, which installs in parallel
116 with libsigc++-2.0. The API is not significantly different, but the
117 implementation is far simpler, using variadic templates instead of generating
118 C++ code from .m4 files.
120 libsigc++-3.0 requires a compiler with C++14 support.
125 * signal: Add a moving connect() method, taking an rvalue reference
127 (Kjell Ahlstedt) Bug #756484
128 * can_deduce_result_type_with_decltype: Rename the check() methods to
129 checksize(). check() is a preprocessor macro in Mac OS X.
130 (Kjell Ahlstedt) Bug #759315 (David Otto)
131 * Temporarily undefine the nil macro, if it's defined.
132 nil is a preprocessor macro in Objective-C++ and Mac OS X.
133 (Kjell Ahlstedt) Bug #695235
134 * Correct the mem_functor<> declarations.
139 * slot: Handle auto-disconnection when a slot contains a slot
140 (Kjell Ahlstedt) Bug #755003 (Ryan Beasley)
141 * slot and signal: Correct move constructors and move assignments.
142 (Kjell Ahlstedt) Bug #756484.
143 * trackable, slot_base, signal_base, connection: Add some noexcept specs
144 (Kjell Ahlstedt) Bug #756484.
145 * trackable, slot, signal: Remove noexcept from move operations.
146 (Kjell Ahlstedt) Bug #756484.
147 * slot and signal: Add missing move constructors and move assignments
148 (Kjell Ahlstedt) Bug #756484.
149 * signal_impl: =delete copy and move operations.
150 (Murray Cumming, Kjell Ahlstedt) Bug #756484
151 * typed_slot_rep: =delete unimplemented copy and move operations.
152 (Murray Cumming, Kjell Ahlstedt) Bug #756484
153 * slot_rep: =delete copy and move operations.
154 (Murray Cumming, Kjell Ahlstedt) Bug #756484
159 * Add back deprecated adaptors/lambda API to avoid an unintented ABI break.
160 (Kjell Ahlstedt) Bug #755550 (Michael Biebl)
161 * sigc::trackable: Move operations: Don't move the callback list
162 (Kjell Ahlstedt) Bug #755393 (Tom Schoonjans)
167 * C++11: deduce_result_type: Simplify with C++11 variadic template.
168 (Murray Cumming, Marcin Kolny) Bug #753612
169 * Fix the build with MSVC.
170 (Chun-wei Fan) Bug #754082
171 * Update the website.
177 * slot_base::operator=(const &): Copy the blocked too,
178 so the destionation is blocked if the source is blocked,
179 regardless of whether the destionation was previously
180 blocked, because this seems to be what we should expect.
182 * C++11: slot_base, slot*, signal_base, signal*, trackable:
185 * Update MSVC Projects, requiring at least MSVC++ .Net 2013
192 * Use C++11 "using" aliases to simplify code that uses type traits.
193 (Murray Cumming) Bug #753580
198 * Remove useless headers:
205 Some of these still have equivalents in sigc++/adaptors/
206 (Kjell Ahlstedt, Murray Cumming) Bug #752560
207 * C++11: Replace deprecated std::auto_ptr by std::unique_ptr.
209 * C++11: Use std::is_base_of<> instead of our sigc::is_base_and_derived<>,
210 removing sigc::is_base_and_derived<>.
211 (Kjell Ahlstedt, Murray Cumming) Bug #752560
212 * C++11: Use of range-based for loops.
214 * C++11: Use of the auto keyword.
216 * C++11: Use of nullptr instead of 0.
218 * sigc++/slot.h: Use a regular .h file instead of generating it
219 from an .m4 file. Bug #752560
221 * Visual Studio Builds: Move 2010 Projects to 2012 to support C++11.
223 * Use -Wformat-security and -Wshadow with --enable-warnings=fatal.
229 * Use (and require) C++11
231 * Using C++11 lambda functions to create sigc::slots:
232 Avoid the need for SIGC_FUNCTORS_DEDUCE_RESULT_TYPE_WITH_DECLTYPE.
234 * Remove the already-deprecated sigc::lambda (and sigc::group) API.
235 This is an API change but should not be an ABI change, so it should
236 only affect you when rebuilding applications, if you use this API.
237 (Murray Cumming, Kjell Ahlstedt)
242 * A slot's functor is destroyed when an empty slot is assigned to the slot.
243 (Kjell Ahlstedt) Bug #738602 (James Lin)
244 * test_disconnect_during_emit tests that the slot is really disconnected
245 during signal emission.
250 Note: API/ABI is the same as in release 2.3.2. Compared to stable
251 releases 2.2.x, the API has been broken regarding visit_each() functions.
252 See the NEWS entry for libsigc++ 2.3.2.
254 * Fix the test_lambda test case for MS Visual C++ 2013 and other
255 C++11-compliant compilers.
256 (Kjell Ahlstedt) Bug #734368 (Ryan Beasley)
257 * Add a missing #include in limit_reference.h.
260 - Use doxygen-extra.css from the mm-common package.
261 Requires mm-common 0.9.7 when configured to use maintainer-mode.
266 Note: The implementation of bug #724496 breaks API for some users,
267 but it does not break ABI.
268 Only users who have added their own visit_each() overloads are affected by
269 the API break. Their programs will still compile, but there will be run-time
270 errors, if they rely on auto-disconnection of slots.
271 Updated instructions for users who implement their own adaptors are found
272 in the description of sigc::adapts<>.
274 * Replace visit_each() overloads by struct visitor<>.
275 Add the test_visit_each test case.
276 (Ryan Beasley, Kjell Ahlstedt) Bug #724496
277 * signal_impl::notify(): Don't delete signal_impl during erase().
278 (Kjell Ahlstedt) Bug #564005 (Alexander Shaduri)
279 * Fix 'make check' with clang++ 3.4 and --enable-warnings=fatal
280 (Kjell Ahlstedt) Bug #724496 (Ryan Beasley)
281 * Fix test_cpp11_lambda for gcc 4.8
283 * Speed up disconnection of slots.
284 (Kjell Ahlstedt) Bug #167714 (Neal E. Coombes)
285 * Auto-generate the ChangeLog from the git log for 'make dist'.
287 * Don't use __file__ in the FIREWALL m4 macro.
288 (Kjell Ahlstedt) Bug #699168 (John Ralls)
289 * Add the track_obj() adaptor and test_track_obj test case.
290 Deprecate libsigc++ lambdas, sigc::group() and sigc::var().
291 Use C++11 lambda expressions instead.
292 (Kjell Ahlstedt) Bug #672555
294 - Emphasize that signals are reference counted.
295 (Kjell Ahlstedt) Bug #611941 (Jonathon Jongsma)
296 - Mention std::function<> and std::bind() where appropriate.
297 (Kjell Ahlstedt, Chris Vine)
298 - Use DOXYGEN_SHOULD_SKIP_THIS consistently to exclude internal
299 functions from the reference documentation.
302 - Enable C++11 lambda expressions with MS Visual Studio 2012 and later
303 (Ryan Beasley) Bug #733752
304 - Update MSVC_Net2010
305 (Kjell Ahlstedt) Bug #724496 (Ryan Beasley)
309 * signal_base: Add blocked(), block(), unblock().
310 (Kjell Ahlstedt) Bug #153780
314 * Fix comma operator in libsigc++ lambda expressions.
315 Andris Pavenis) Bug #342911
316 * Added SIGC_FUNCTORS_DEDUCE_RESULT_TYPE_WITH_DECLTYPE.
317 This allows most uses of libsigc++'s lambda expressions to be
318 replaced by standard C++11 lambda expressions.
319 (Kjell Ahlstedt) Bug #672555.
320 Thanks to Chow Loong Jin, who posted similar code on libsigc-list.
321 * Use std::size_t and std::ptrdiff_t instead
323 * Fix 'make check' with gcc 4.7.
325 * Enable test_lambda in 'make check'.
326 (Kjell Ahlstedt) Bug #669128.
331 * slot_rep: Avoid access to deleted object in notify(),
333 (Kjell Ahlstedt ) Bug #564005 (Alexander Shaduri)
334 * Mention visit_each() in the documentation of sigc::adapts.
339 * trackable: Avoid calling the same callback function twice, fixing some
341 (Kjell Ahlstedt) Bug #589202
342 * Minor documentation corrections.
344 * Fix the build with GCC 4.6
346 * Windows build fixes for MSVC++ .Net 2005 and 2010
351 Nothing interesting. Just a small change for library.gnome.org.
356 - Added main page text with doxygen.
357 (David King, Murray Cumming)
358 - Fix the functors Doxygen group.
360 - Tutorial: Removed outdated marshallers section that had no working example.
361 (Murray Cumming) Bug #417924 (Michael Ekstrand)
365 * Slight documentation changes.
366 (Murray Cumming) Bug #614741 (Armin Burgmeier)
370 * Accumulators: Allow return types that are different to the signal's.
371 (Krzysztof Kosiński)
373 - Disable collaboration graphs in documentation
374 - Use non-blurry font for graph labels.
376 - sigc::hide() correction: It always only hides one signal argument.
378 * Fix the MSVC++ build.
383 * Namespace sigc is now documented, in order to make large chunks of the
384 reference reappear. (Daniel Elstner)
385 * The shipped reference documentation has been regenerated using Doxygen
386 1.6.1, so that the document type is now XHTML 1.0. (Daniel Elstner)
387 * The shipped Devhelp file has been generated with a newer version of the
388 XSLT script in mm-common, so that documentation groups no longer appear
389 as namespace prefixes in the keyword list. (Daniel Elstner)
393 * Reenable the per-class hierarchy graphs in the reference documentation.
395 * Drop the custom HTML header and footer, and use the shared doxygen.css
396 file from mm-common. (Daniel Elstner)
400 * New build system based on mm-common. The mm-common module is now
401 required for building from the git repository, but not for builds
402 of release archives. (Daniel Elstner)
403 * The public reference documentation is now hosted on library.gnome.org.
404 (Frédéric Péters, Daniel Elstner)
409 - Added project files (and property sheets) for
410 MSVC++ 2005 and 2008.
412 - Removed unnecessary dependency on afxrefs.h, so it builds
413 with MSVC++ Express editions.
418 * Added an include of functors/slot.h that was mistakenly removed
419 during the 2.1 series.
420 (Deng Xiyue) Bug #521418.
424 * Really fix the build with Sun CC.
425 (Elaine Xiong. Bug #302098)
429 * Build fixes when using gcc 4.3 pre-releases.
430 (Ryan Hill, Vladimir Marek)
434 WARNING: This is an unstable release and should not yet be
435 packaged by distributions unless libsigc++ 2.0.x does not
436 build for some reason (Please report such bugs).
438 * Removed the SigC:: namespace and other compatibility API,
439 to fix the build with some versions of some compilers,
440 such as the SUN Forte C++ CC compiler.
441 See bug #302098, for instance
444 - Added Added typedefs for
445 value_type, reference, and pointer, so that these
446 iterators are more like standard C++ iterators, so they can
447 be used with standard C++ algorithms.
448 (Michael Elkstrand) (Bug #417926).
449 - Added emit_reverse().
454 * slot::disconnect(): Make this work.
455 sigc::connection::disconnect() already worked.
456 (James Lin, Murray Cumming)
457 * visit_each compilation problem fixed.
462 * Fixed build for SUN Forte C++ 5.5
463 * Fixed build for MSVC++ 7.1
464 * Fixed crash when using --no-inline with g++.
468 * g++ 3.2 (and Mac OS X g++ 3.3) build fix.
470 * Compose: Fix slot lifetime regression introduced in
471 2.0.9. (Philip Langdale)
472 * tests: Small ISO C++ correctness fix (Marek Rouchal)
473 * Don't specify unused function parameter names.
478 * SUN Forte 5.7 build fix for ambiguity when using
479 inner template class. However, you still need the
480 patch in bug #302098 to finish the build.
484 * signal_emit::emit(): Ensure the correct order of
485 destruction of the member variables, to avoid a leak.
486 (Andreas Ames, bug #306249)
487 * Allow recursive signal emission again.
488 (Neal E. Coombes, bug #303896)
489 * SUN Forte CC 5.5 build fixes:
490 - test_compatibility minor fix.
491 - visit_each() template specializations:
492 Mention the bool I_derives_trackable template type,
493 (Friedemann Kleint, bug #305647)
494 - Check for the non-standard SUN reverse_iterator,
495 and use alternative code if necessary.
500 * Fixes crashes when using virtual inheritance, particularly
501 with bound by-reference parameters, caused by casting
502 from derived to base when the derived destructor has run.
504 This might affect non-g++ compilers, so do tell us about
509 * Build fixes for SUN Forte, Tru64
510 (Murray Cumming), and MSVC++ (Cedric Gustin).
514 * tests: Include <new> to avoid unresolved symbols on Tru64.
516 * When signal handlers are connected made during an emit
517 of the same signal, prevent them from being called in the
518 same emit, to prevent infinite loops.
520 * Performance improvement in a corner case.
525 * sigc::bind() now works with the AIX and Tru64 compilers.
526 See the comments in sigc++/visit_each.h: visit_each_type()
527 if you have compilation problems.
529 * sigc::var() is now documented. (Roger Ferrer Ibáñez)
533 * Maybe avoid (incorrect) warning with g++ 3.3.5.
535 * Fix namespace ambiguity when using multiple
536 major versions of libsigc++. (Liza Klerck)
540 * Now builds with the following compilers, in addition to
541 the existing GNU g++, SUN Forte CC 5.5, MSVC++ .Net 2003,
545 - IRIX MIPSpro 7.4.2m
546 (Older versions of all these compilers might also work.)
547 (Murray Cumming, www.thewrittenword.com)
548 * MSVC++ .Net 2003 build improvements.
549 (Cedric Gustin, Timothy M. Shead)
550 * Replace C-style casts with reinterpret_cast<> and
551 static_cast<>. (e97_far at e.kth.se).
552 * Documentation: Added manual, based on the manual in
553 libsigc++ 1.2, but updated for the new API.
559 * Fixed a memory leak in sigc::slot.
560 * Fixed compilation for gcc-3.4.
561 * Fixed compilation for Intel C++ compiler (upgraded libtool).
562 * Fixed project files for MSVC .Net (Timothy M. Shead).
563 * Fixed segfaults when compiled with MSVC .Net 2003 (moved
564 all calls to new and delete into non-inline library code).
565 * In the compatibility module use correct bound_mem_functor
566 variants for const (volatile) methods when creating a slot.
567 * Minor documentation fix.
568 * Resolved bugs: #152327 #148744 #152323 #151404 #153143
572 * Distribute pregenerated configuration header for MSVC .Net.
576 * Fixed warnings and compiler errors in the test cases.
577 * Added a new test case (Murray Cumming).
578 * Fixed 'hello_world' example.
579 * Don't test optional features that fail with the Sun FORTE.
580 * Fixes for the Sun FORTE to compile out-of-the-box
581 (Damien Carbery, Murray Cumming, Martin Schulze).
582 * Fixes for MSVC to build a DLL out-of-the-box (James Lin).
583 * Improved compiler specific configuration during 'configure'.
584 * Added rmp description file libsigc++-2.0.spec (Eric Bourque).
585 * Minor documentation improvements (Murray Cumming).
586 * Resolved bugs: #147311 #147313 #147391 #144846 #145541
590 * Fix segfault on emission of unconnected signal.
591 * Test emission of unconnected signals in the test case.
592 * Suppress compiler warning at dynamic_cast<>-test for good.
593 (Help from Christof Petig and Timothy M. Shead.)
597 * Suppress compiler warning in compatibility module at
598 dynamic_cast<>-test (fix suggested by Timothy M. Shead).
599 * If a custom accumulator is specified invoke it on signal
600 emission even if the signal's slot list is empty. (This used
601 to be the case in libsigc++-1.2 as pointed out by Timothy.)
605 * Fixed serious bug in reference counting in sigc::signal_base::impl().
606 * Fixed SigC::Object-derivation check in SigC::slot() compatibility module.
607 * Fixed compilation on Apple gcc 3.3 (assisted by Spundun Bhatt).
608 * Fixed configure check for gcc 3.4 (Murray Cumming).
612 * Implemented sigc::connection::blocked() (Murray Cumming).
613 * Added the scripts directory to the make dist target (Murray Cumming).
614 * Added more documentation (Martin Schulze).
618 * Fixed compiler warning in sigc::connection (Alexander Nedotsukov, Murray Cumming).
619 * Fixed examples and made them part of the regular build (Murray Cumming).
620 * Added header sigc++config.h for configure time checks (Murray Cumming).
621 * Added configure time checks to determine the correct syntax
622 for explicit template method specializations (Murray Cumming).
623 * Removed code using partial specializations of overloaded template methods
624 from test cases. SUN Forte doesn't support this feature (Martin Schulze).
625 * Fixed compilation for gcc 3.4 (Murray Cumming).
630 * Add numbered slot# templates.
631 * Allow for methods of the object's base types to be passed into sigc::mem_fun().
633 Other fixes and cleanups:
634 * Make is_base_and_derived template compatible with the SUN Forte.
635 * Non-template code moved from .m4 macro source to .h/.cc files (Murray Cumming).
636 * Implementation moved to .cc files (Murray Cumming).
637 * More fixes for the SUN Forte. Make some more ctors explicit.
641 * Added sigc::slot_base::operator bool() (Murray Cumming).
642 * Build docs directory by default (Murray Cumming).
643 * Fixed minor doxygen issues (Murray Cumming).
644 * Fixed compiler warning in signal.h (Murray Cumming).
648 * Fixed passing references through sigc::slot (Reported by Jeff Franks).
649 * Enabled binding of objects to method slots through sigc::bind().
650 * Reworked sigc::bind() API: Made the template argument for the
651 parameter position zero-based and optional. Added overloads for
652 binding of up to 7 arguments at a time when no position is specified.
653 * Reworked sigc::hide() API: Made the template argument for the
654 parameter position zero-based and optional.
655 * Fixed compilation problems with MSVC .Net 2003 (Roel Vanhout).
656 * Distribute MSVC .Net 2003 project files in the tarballs.
657 * Improved and extended documentation.
662 * Added adaptor retype(). With this final API addition all adaptors
663 are in place that are available in libsigc++-1.2.
664 * Added negation lambda operator. Use STL names for lambda actions.
665 * Remove formerly disabled support for gcc extension typeof().
666 * Added project files for MS Visual Studio .Net 2003. (Roel Vanhout)
667 * Make libsigc++2 compile with .Net 2003. (Roel Vanhout, Martin Schulze)
668 * Build shared version of libsigc++2 by default. (Cedric Gustin)
669 * Add support for win32 platform. (Cedric Gustin)
670 * Install .m4 files. (requested by Ron Steinke)
671 * Cleaned up functors.
672 * Restructured and completed documentation of the core library parts.
676 API Additions and important bug fixes:
677 * Compatibility module completed. libsigc++-1.2 filenames are preserved.
678 * Fixed critical bug in auto-disconnection: don't defer detaching
679 of a slot from all referred trackables during signal emission.
680 * Reduced size of slots significantly.
681 * Fixed support for sigc::ref() in adaptors.
682 * Fixed sigc::visit_each(): only hit targets that are passed by
683 reference; pass bound members in bound_member_functor by reference.
684 * Add lambda actions sigc::{reinterpret,static,dynamic}_cast_
685 to support explicit parameter conversion.
686 * Add adaptors sigc::retype_return<>() and sigc::hide_return().
689 * Fixed return type deduction for bind<0>.
690 libsigc++-1.9.11 should compile with gcc-3.3.
691 * Fixed copy constructor and operator=() of slot template.
692 * Fixed a compiler warning in signal_emit#<>::emit().
693 * Improved test case.
697 * Fix compiler issues with gcc-3.3.2 (patch from Jeff Franks).
698 * Remove compiler check for the gcc extension typeof().
699 * Simplify bind_functor templates.
700 * Move definition of struct nil into functor_trait.h.
704 * Add a constructor to sigc::connection that takes a slot_base&
705 to support user defined slot lists like they are used in gtkmm.
706 * Fix compiler issues with gcc-3.3.2 (reported by Jeff Franks).
710 * Add compatibility module that defines namespace SigC.
711 namespace SigC should be API compatible to libsigc++-1.2.
712 Currently only the core parts of the library are supported.
713 Adaptors are still to follow.
714 * Fix connection::operator=(). Include connection.h in sigc++.h.
715 * Get rid of namespace functor.
716 * Rename dependency to destroy_notify_callback.
717 * Rename trackable::clear() to trackable::notify_callbacks().
718 * Move slot_base, signal_base, slot_iterator[_buf], slot_list
719 out of namespace internal. They are public API.
720 * Add reference counter to signal_impl enabling signals
721 to share the underlying information.
722 * Add convenience function signal#::make_slot().
723 * Get rid of one-letter-parameter-names.
724 * Get rid of "using namespace ..." in the test cases.
725 * Add lambda operators subscript ([]) and assign (=).
726 * Fix is_base_and_derived<> for const types.
727 * New and updated documentation.
728 * Add previous announces to file NEWS.
732 * Added sigc++/sigc++.h. (Murray Cumming)
733 * Added member_method example. (Murray Cumming)
734 * Renamed closure to slot.
735 * Fixed issues with gcc-3.3. (Adreas Rottmann)
736 * Removed unnecessary void specializations.
737 * Made adaptors' operator()() (overload with no arguments) return a value.
738 * Made visit_each() support adaptors.
739 * Overhauled return type deduction to make it work without typeof().
740 * Added convinience macros SIGC_FUNCTORS_HAVE_RESULT_TYPE and
741 SIGC_FUNCTOR_TRAIT(T_functor, T_result) to make return type deduction system
742 support 3rd-party funtors.
743 * Changed syntax of group adaptor from "[functor] % grp([lambdas])" to "group
744 ([functor], [lambdas])".
745 * Made many fixes to lambda functionality.
746 * Added var() and constant() lambda creators.
747 * Added many lambda operators.
748 * Added ref() which creates a reference wrapper to enable storage of
749 references in bind and group adaptors.
750 * Expanded test suite.
751 * Added documentation. (Corrections by Murray Cumming)
755 * First public release of the unstable 2.0 generation.
756 libsigc++ 2.0 uses modern C++ mechanisms to achieve a highly
757 flexible, yet typesafe callback system. It supports all features of
758 libsigc++ 1.2 and improves upon it by:
759 - No need to specify the number of arguments in signal definitions.
760 - Connection of any compatible (=implicitly convertable) functor
762 - Implicit type conversions of parameters during signal emission.
763 - Lambda adaptor for complete restructuring of functor parameter
764 lists in one line (subject to changes).
765 - Signal has a fully featured stl style list interface.
766 - A convinient accumulator API (replacing the old marshaller API).
767 - Removal of unnecessary memory management functionality.
768 - Lightweight class "trackable" for use as base class of your
769 class hierarchy replaces class "Object".