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[utility] result_of and lambda patch
by Daniel Walker 22 Mar '07

22 Mar '07

Hello, I noticed that result_of doesn't handle functors created by the Boost Lambda Library. For example, $ g++ -dumpversion 4.1.2 $ cat result_of_error.cpp #include <boost/lambda/lambda.hpp> #include <boost/utility/result_of.hpp> using namespace boost; template<class Functor, class Arg1, class Arg2> void f(Functor const&, Arg1 const&, Arg2 const&) { typedef typename result_of< Functor(Arg1, Arg2) >::type result_type; } int main() { using namespace lambda; int x = 0, y = 0; f(ret<int>(_1 + _2), x, y); } $ g++ -I./boost result_of_error.cpp 2>&1 | perl gSTLFilt.pl ./boost/boost/utility/result_of.hpp:68: error: no class template named 'result' in 'class boost::lambda::lambda_functor< ... >' ... $ Among Boost libraries, there are at least two ways for function objects to expose return types that are dependent on the types of their arguments. 1) result_of instructs users to expose a template result<F(ARG1, ..., ARGN)>. 2) Boost.Lambda instructs users to expose a template sig<tuple<ARG1, ..., ARGN>, and it also uses this convention internally. It might be nice to unify these two approaches one day or perhaps simplify the matter by implementing result_of in terms of the Boost Typeof Library along the lines of Douglas Gregor's "Looking Ahead" section in his 2003 paper, http://tinyurl.com/2nf5ym. But I figure in the mean time why not have result_of support both of the current approaches? If the functor has a nested sig template use that, otherwise try to use a nested result template. There's one additional caveat for supporting lambda expressions. A zero arity lambda functor expose its result type through the typedef nullary_return_type. This can be handle in result_of by providing a partial specialization of result_of_void_impl for the template class lambda::lambda_functor. The attached patch adds support for sig in functors and nullary lambda functors. Apply with 'patch -p0 < djw_result_of.patch' from the boost root directory. It depends on the has_template_xxx patch I submitted previously (http://tinyurl.com/35x5z5) Also, if has_template_xxx is unsupported for a particular compiler the patch supplies a partial specialization of result_of_nested_result for lambda::lambda_functor. That way at least lambda expressions can be supported if not user defined functors that employ the Boost Lambda Library's convention of specifying result types. I ran the Boost Utility Library test suite and everthing passed. Let me know and I can provide documentation and tests. Thanks! Daniel Walker

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Re: [boost] [Boost-announce] Review of Intrusive library begins today
by brangdon＠cix.compulink.co.uk 22 Mar '07

22 Mar '07

In-Reply-To: <46001891.5080209(a)gmail.com> igaztanaga(a)gmail.com (=?ISO-8859-1?Q?Ion_Gazta=F1aga?=) wrote (abridged): > Sink sounds good but now I need a name for operations: I would be tempted by: clear_and() erase_and() leaving open what the passed functor was expected to do. Alternatively: clear_and_dispose() erase_and_dispose() because for me "dispose" is a less committed word than "destroy". It still has the connotation that the container is getting rid of them, but leaves it more open as to what that entails. "Dispose" does have a more specific meaning in garbage collection circles; I don't know if that would be a problem here. > > Could remove_and_destroy take a default Destroyer argument that > > deleted the value? > > Well, functions can't have default template parameters Ah, OK. (Sometimes these language restrictions take me by surprise.) > I understand that maybe replacing code using list<value*> is not an > easy task, but I prefer to stick to the STL interface. You would still do that, but instead of instantiating ilist<T> you would instantiate ilist<T*>. To me there is a fairly strong sense in which the list does not contain values, but only pointers to them, because of the lifetime issues. I see myself creating objects and then adding them to the collection, rather than adding copies of them, so the semantics are closer to std::list<T*> than to std::list<T>. Where there are differences they are restrictions (no NULLs, no putting items in multiple lists etc) rather than changes. The main drawback I see to my suggestion is that a signature like: void push_back( T * ); suggests that we can pass NULL, where-as your current signature makes it clear we can't (because it takes a T reference argument). And we would have the usual std inconvenience of having to use things like (*i)->member instead of i->member for iterators. I don't know; it's just something which surprised me. Do other people think ilist is closer to list<T> or list<T*>? > Well, comparing sizes of STL containers is a bit misleading, because > how many bytes are we supposed to use in memory bookeeping if we use > standard allocators? I'd say none. For example, I believe the overhead for a std::slist<T*> node is 2 pointers, half that of ilist<T>. (And that is the comparison I would make, because I see ilist<T> as a replacement for std::list<T*> rather than for std::list<T>, but maybe I am unusual in that.) -- Dave Harris, Nottingham, UK.

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[Boost-bugs] [ boost-Bugs-1686329 ] Usage of uninitialized data member
by SourceForge.net 22 Mar '07

22 Mar '07

Bugs item #1686329, was opened at 2007-03-22 13:55 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1686329&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: serialization Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Robert Ramey (ramey) Summary: Usage of uninitialized data member Initial Comment: In the attached test case, data member basic_iarchive_impl::moveable_objects_recent is used before being initialized. More specifically, the first call to basic_iarchive_impl::reset_object_address occurs before the first assignment of basic_iarchive_impl::moveable_objects_recent takes place (in basic_iarchive_impl::load_object). The usage of uninitialized data can be detected using a memory checker such as valgrind, or a debugging environment which sets uninitialized memory to distinctive values, such as Visual C++. I found this problem in 1.33.1 but I had a look at the 1.34 code in cvs and it does not appear to be fixed. In a tentative fix I initialized moveable_objects_recent in the basic_iarchive_impl constructor (to zero). This seems to work but I am not sure it is the right solution. This problem still occurs if the extra "i++" in basic_iarchive_impl::reset_object_address present in 1.33.1 is taken out. This bug seems to be triggered by serializing a map whose values contain vectors. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1686329&group_… ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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Re: [boost] Boost.Threads, N2178, N2184, et al
by Emil Dotchevski 22 Mar '07

22 Mar '07

> > Pthread is there, standardized, proven in practice, so why > > not make use of it? In addition, there is a lot of legacy > > pthread code which N2178 makes compatible with future C++ > > <thread> based code. I consider both to be Good Things.> > Some of the most annoying problems in C++ directly stem from being> compatible with C :-/ This statement would be off-topic unless you mean that there are problems in N2178 that stem from the fact that it's based on pthread. Emil Dotchevski _________________________________________________________________ Take a break and play crossword puzzles - FREE! http://games.msn.com/en/flexicon/default.htm?icid=flexicon_ wlmemailtaglinemarch07

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[Boost-bugs] [ boost-Bugs-1686274 ] two memory leaks in boost threads
by SourceForge.net 22 Mar '07

22 Mar '07

Bugs item #1686274, was opened at 2007-03-22 11:25 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1686274&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: threads Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Mike Glassford (glassfordm) Summary: two memory leaks in boost threads Initial Comment: (In both these instances, the heap memory is never deleted) tss_hooks.cpp:29 threadmon_mutex = new boost::mutex mutex.inl:55 LPCRITICAL_SECTION critical_section = new CRITICAL_SECTION ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1686274&group_… ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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Please someone help me in completing my proposal for GSoC
by Madhusudan C.S 22 Mar '07

22 Mar '07

Hi everyone, I have written an application to be submitted to Google which is sent as an attachment with this mail. I have completed almost all the sections in that application except the project details part and implementation. In that application I have mentioned many of the ideas but I still have many ideas for the GUI frontend part I have mentioned. I have a good knowledge of Qt and C++ and can manage with both of these. If somebody is ready to mentor can me it would be of very great help for me since I am a student who is very keen on getting into the world of Open Source Software Development but I don't know how. So I request someone to mentor me. Since only two days are left to submit the application I hope someone here would reply as quickly as possible since I need to discuss the possibilities and impossibilities of implementation of the ideas I have in my mind before submitting the application. -Madhusudan.C.S

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Boost inspection notification (2007-03-22/RC_1_34_0) *LC*
by Rene Rivera 22 Mar '07

22 Mar '07

Boost Inspection Report Run Date: 16:06:40 UTC, Thursday 22 March 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11447 files scanned 908 directories scanned (including root) 1053 problems reported Problem counts: 654 files missing Boost license info or having wrong reference text 399 files missing copyright notice Summary: any (1) archive (1) build (68) concept_check (22) conversion (5) doc (1) filesystem (2) function (1) graph (1) inspect (1) integer (9) lambda (10) libs (6) logic (2) math (1) more (13) mpl (419) multi_array (13) numeric (188) optional (1) people (4) program_options (35) property_map (15) ptr_container (8) python (6) rational (5) regex (4) regression (118) release (2) serialization (16) signals (2) smart_ptr (8) test (3) timer (1) tr1 (2) tuple (5) utility (12) variant (42) Details: *L* missing Boost license info, or wrong reference text *C* missing copyright notice |any| libs/any/doc/ any.xml: *L* |archive| boost/archive/detail/ utf8_codecvt_facet.hpp: *L* |build| tools/build/v2/build/ build-request.jam: *L* modifiers.jam: *L* tools/build/v2/doc/ Jamfile.v2: *C* *L* 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index.html: *C* *L* libs/variant/test/ Jamfile.v2: *L*

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Boost inspection notification (2007-03-22/RC_1_34_0) *X*
by Rene Rivera 22 Mar '07

22 Mar '07

Boost Inspection Report Run Date: 16:06:33 UTC, Thursday 22 March 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11447 files scanned 908 directories scanned (including root) 196 problems reported Problem counts: 1 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 104 broken links 21 unlinked files 22 file/directory names issues 1 files with tabs 9 violations of the Boost min/max guidelines 35 usages of unnamed namespaces in headers (including .ipp files) Summary: archive (3) bind (1) boost-root (3) build (2) date_time (1) doc (2) filesystem (37) graph (2) iostreams (3) lambda (3) math (8) more (1) mpl (1) multi_array (2) ptr_container (1) python (10) regex (1) regression (32) serialization (1) test (81) type_traits (1) Details: *R* invalid (cr only) line-ending *A* invalid bookmarks, invalid urls, broken links, unlinked files *N* file/directory names issues *T* tabs in file *M* uses of min or max that have not been protected from the min/max macros, or unallowed #undef-s *U* unnamed namespace in header |archive| boost/archive/basic_streambuf_locale_saver.hpp: *N* name exceeds 31 characters boost/archive/impl/xml_wiarchive_impl.ipp: *U* unnamed namespace at line 53 boost/archive/iterators/remove_whitespace.hpp: *U* unnamed namespace at line 57 |bind| boost/bind/placeholders.hpp: *U* unnamed namespace at line 25 |boost-root| index.htm: *A* broken link: doc/hmtl/date_time.html *A* broken link: doc/hmtl/date_time/details.html#changes *A* broken link: more/BoostCon07.html |build| tools/build/v2/test/test_system.html: *A* unlinked file tools/build/v2/tools/python.jam: *R* |date_time| libs/date_time/xmldoc/date_time_docs_howto.html: *A* unlinked file |doc| doc/html/boost_math/inverse_complex.html: *A* unlinked file doc/html/jam.html: *A* unlinked file |filesystem| libs/filesystem/doc/do-list.htm: *A* invalid URL (hardwired file): file://?/ *A* invalid URL (hardwired file): file://?/UNC/ libs/filesystem/doc/i18n.html: *A* broken link: convenience.htm#basic_recursive_directory_iterator *A* broken link: exception.htm *A* broken link: operations.htm *A* broken link: operations.htm#Do-the-right-thing *A* broken link: operations.htm#is_directory *A* broken link: operations.htm#is_file *A* broken link: operations.htm#status libs/filesystem/doc/index.htm: *A* broken link: ../build/Jamfile *A* broken link: convenience.htm *A* broken link: fstream.htm *A* broken link: operations.htm#create_directory *A* broken link: operations.htm#create_hard_link *A* broken link: operations.htm#current_path *A* broken link: operations.htm#directory_iterator *A* broken link: operations.htm#equivalent *A* broken link: operations.htm#file_size *A* broken link: operations.htm#initial_path *A* broken link: operations.htm#is_file *A* broken link: operations.htm#is_symlink *A* broken link: operations.htm#status *A* broken link: operations.htm#symlink_status *A* broken link: path.htm#Canonical *A* broken link: path.htm#Grammar *A* broken link: path.htm#Normalized *A* broken link: path.htm#default_name_check *A* broken link: path.htm#name_check_mechanism *A* broken link: path.htm#normalize *A* broken link: path.htm#operator_eq *A* broken link: path.htm#synopsis libs/filesystem/doc/portability_guide.htm: *A* broken link: path.htm#name_check_typedef libs/filesystem/doc/tr2_proposal.html: *A* invalid URL (hardwired file): file:///C|/boost/site/libs/filesystem/doc/operations.htm#complete_note |graph| libs/graph/example/file_dependencies.cpp: *M* violation of Boost min/max guidelines on line 139 libs/graph/test/serialize.cpp: *T* |iostreams| libs/iostreams/doc/acknowledgments.html: *A* unlinked file libs/iostreams/doc/concepts/multi-character.html: *A* unlinked file libs/iostreams/doc/installation.html: *A* broken link: ../../../tools/build/v1/build_system.htm |lambda| boost/lambda/core.hpp: *U* unnamed namespace at line 62 boost/lambda/detail/lambda_functors.hpp: *U* unnamed namespace at line 25 boost/lambda/exceptions.hpp: *U* unnamed namespace at line 24 |math| libs/math/test/common_factor_test.cpp: *M* violation of Boost min/max guidelines on line 146 *M* violation of Boost min/max guidelines on line 147 *M* violation of Boost min/max guidelines on line 193 *M* violation of Boost min/max guidelines on line 194 |more| more/separate_compilation.html: *A* broken link: ../libs/config/test/link/test/Jamfile.v2 |mpl| boost/mpl/alias.hpp: *U* unnamed namespace at line 17 |multi_array| boost/multi_array/base.hpp: *U* unnamed namespace at line 69 libs/multi_array/test/generative_tests.hpp: *U* unnamed namespace at line 57 |ptr_container| libs/ptr_container/doc/tutorial_example.html: *A* unlinked file |python| libs/python/doc/building.html: *A* broken link: ../../../tools/build/v1/build_system.htm *A* broken link: ../../../tools/build/v1/build_system.htm#user_globals *A* broken link: ../../../tools/build/v1/build_system.htm#variants libs/python/doc/tutorial/doc/html/python/hello.html: *A* broken link: ../../../../../example/tutorial/Jamrules libs/python/doc/tutorial/index.html: *A* broken link: ../../../LICENSE_1_0.txt libs/python/doc/v2/May2002.html: *A* broken link: ../../../../tools/build/v1/build_system.htm *A* broken link: ../../../../tools/build/v1/gen_aix_import_file.py libs/python/doc/v2/faq.html: *A* broken link: ../../../../tools/build/v1/build_system.htm |regex| libs/regex/performance/input.html: *A* unlinked file |regression| regression/.htaccess: *N* leading character of ".htaccess" is not alphabetic tools/regression/test/test-cases/incremental/bjam.log.1: *N* name contains more than one dot character ('.') tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/compile-fail.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/completed.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/compile-fail.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/completed.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/lib.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/misfire.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/no-run.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/run_pyd.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/test-case.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/test-case.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/test-driver.xsl: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_re_match/expected/test_re_match.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_test_case_status/explicit-failures-markup.xml.test: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ *N* name contains more than one dot character ('.') *N* name exceeds 31 characters tools/regression/xsl_reports/test/test-components/test_test_structure/explicit-failures-markup.xml.test: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ *N* name contains more than one dot character ('.') *N* name exceeds 31 characters tools/regression/xsl_reports/xsl/html/issues_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/library_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/library_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/make_tinyurl.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/summary_developer_legend.html: *A* unlinked file 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End of Intrusive library review period
by Joaquín Mª López Muñoz 22 Mar '07

22 Mar '07

The official period for the formal review of Ion Gaztañagas's Intrusive has finished on March 21, although there is no problem with continuing the ongoing discussions or submiting past last minute reviews during a few days. I plan to compile the contributions and publish the final result by the end of the next week. Thank you to all the participants for the quality and quantity of their contributions. The Review Manager, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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[lambda][utility] patch to make lambda compatible with result_of
by Daniel Walker 22 Mar '07

22 Mar '07

Hello, Following up on Eric's suggestion in this thread, http://tinyurl.com/yr3gc9, I have attached a patch for functors generated by lambda expressions to expose result<F(ARGS)> in addition to sig<tuple<ARGS> > and for lambda expressions to deduce the return type of user defined functors that expose either. This makes the lambda library compatible with result_of and with user defined functors that use the result<> convention of specifying return types. Apply the patch with 'patch -p0 < djw_lambda_result.patch' from the boost root directory. This patch depends on the has_template_xxx patch I submitted previously (http://tinyurl.com/35x5z5) It was a pleasent surprise to find that the required changes are fairly minor. I added result<> traits to lambda::lambda_functor that simply wrap the existing sig<> trait. Following Shunsuke's suggestion, I used a converter to allow lambda::function_adaptor::sig<> to accept functors that use either sig<> or result<>. The patch places the macros I mentioned (http://tinyurl.com/2za4ek) for adding nested result<> members in result_of.hpp. That seems like as good a place as any since they're closely related to result_of. I changed their names a little though. I think this patch is valuable because it alleviates some of the incompatibilities that stem from having more than one convention for specifying argument dependent return types. It also paves the way for deprecating sig<> in favor of the more standard result<>. However, I believe my previous patch (http://tinyurl.com/2h3g7n) to result_of is still valuable as it allows result_of to handle lambda-compatible user defined functors using the existing sig<> convention. Either way, the attached patch allows you to do things like this. #include <boost/lambda/bind.hpp> #include <boost/tuple/tuple.hpp> #include <boost/utility/result_of.hpp> using namespace boost; struct result_functor { // Define a result trait such that result<F(F,A1)>::type is A1. BOOST_FIXED_ARITY_FUNCTOR_RESULT(2, A1) template<class Arg> typename result<result_functor(result_functor, Arg)>::type operator()(Arg const& a) const { return a; } }; struct sig_functor { template<class Args> struct sig { typedef typename tuples::element<1, Args>::type type; }; template<class Arg> typename sig<tuple<sig_functor, Arg> >::type operator()(Arg const& a) const { return a; } }; template<class F, class Arg> typename result_of<F(F, Arg)>::type f(F const& functor, Arg& a) { return functor(a); } int main() { using namespace boost::lambda; typedef char value_type; value_type x; result_functor result_f; value_type y = f(bind(result_f, _1), x); sig_functor sig_f; value_type z = f(bind(sig_f, _1), x); } My previous result_of patch would additionally allow you to do things like this. result_of< sig_functor(sig_functor, value_type) >::type z = f(sig_f, x); This lambda patch and the result of patch can be applied independently or in any order. I ran the lambda test suite and everything passed. I couldn't find a Jamfile.v2 so I made one based on lambda's existing Jamfile. It's included in the patch. Let me know if I've missed something or if you know of a better way to update lambda. Of course, I can send documentation and additional tests if there's interest. Thanks! Daniel

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