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Boost threads bug!
by Roger Wilco 01 Mar '04

01 Mar '04

On Win32: { // Verify boost tss bug is fixed. (still present as of 1.31.0) // This bug will not trigger until application termination. boost::thread_specific_ptr<bool> tss; bool * testPtr = new bool; tss.reset(testPtr); tss.reset(NULL); // testPtr is deleted and is now invalid. tss.get() returns NULL. // When tss goes out of scope, an unpatched Boost will erroneously delete testPtr a second time. } I've posted and emailed this bug at least a dozen times now... I hope this gets through this time. This bug seems very blatant; like it would affect lots of people. Is this bug known? Is Boost threads being actively maintained? This bug has been present for at least a year.

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shared_ptr casts
by Hickman, Greg 01 Mar '04

01 Mar '04

I note that the shared_ptr casting functions have new names in the current release, but I'm just wondering why there is no longer a 'polymophic_cast' function provided? It's not a big deal to me, but I'm curious about the rationale.

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RE: [Boost-users] Re: about license
by Darryl Green 01 Mar '04

01 Mar '04

> -----Original Message----- > From: David Abrahams [mailto:dave@boost-consulting.com] [snip] > >> > If my application uses boost libraries unchanged, is it > considered a > >> > derivative work? > >> > >> Yes. > > > > Really? The ligitimacy of this stance seems questionable (but ianal > > etc). Further I did not see it as being part of the > objectives for the > > license. Quite the opposite in fact. > > Correct. IANAL either. It just seemed to me that we wouldn't have > to provide the explicit exception below unless it could be > interpreted that binaries were derivative. Ah - binaries - ok - that makes sense. > > >> > If so, does that mean that if I distribute my compiled > software, I > >> > must allow free of charge use and distribution? > >> > >> No, the license gives an explicit exemption for compiled code > >> (emphasis mine): > > > > [let me just re-insert some additioanl context here] > > ! The copyright notices in the Software and this entire statement > > ! ... > > ! must be included in all copies of the Software, in whole > or in part, > > and > >> > >> all derivative works of the Software, UNLESS SUCH COPIES > OR DERIVATIVE > >> WORKS ARE SOLELY IN THE FORM OF MACHINE-EXECUTABLE OBJECT > >> CODE GENERATED BY > >> A SOURCE LANGUAGE PROCESSOR. > > > > I took this to mean that nobody can delete/change the > copyright/license > > in the sources if they copy or produce a derivative work > but that there > > is no need to include the license in a binary distribution. > > Correct. > > > It did not occur to me that leaving the license in place somehow > > forms a viral attachment to other source in a source distribution. > > I don't know what you mean. My misunderstanding about what was the derived work in your "yes" above. The rest of my post was based on that misunderstanding. [snip] > > Whatever the conclusion I think this needs to be in the FAQ. > > Patches welcomed I'm happy to provide a patch once I'm reasonably sure I understand the license. I'm assuming an email discussion will be more productive than patches in the meantime. I have one more question that I have a proposed FAQ answer for, but my "answer" is based purely on what I think it should be, not an understanding of the law. The point that confuses me is: If a program uses boost, the binary distro doesn't need to contain the license, but it is a derivative work. As I understand it, a derivative work contains exclusive rights both the "preexisting material" author and "contributed material" author. This in turn means there must be some form of agreement as to how the derivative work can be distributed. The boost license seems to deal with that by saying that the derivative work must contain the boost license wording unless the derivative work is object code. That seems to result in a reasonably clear rule for derivative works that are not object code. What I'm not sure on is whether the grant to allow derivative works, combined with permission to omit the license wording from object code, gives the "contributing author" the right to distribute the object code "derived work" under any terms/license that author choses? Here is my proposed "patch" in a form suitable for forwarding to lawyers for "testing". Q: Does #include <boost/any_old_header.hpp> make the including file a derived work? A: No. That is use, but not derivation. But if instead of #include, you pasted in a legally significant portion of <boost/any_old_header.hpp> , that would make your program a derived work. Note that if you pasted in code from several sources, your code might become a derived work of each of those sources. Source - Beman Dawes in http://aspn.activestate.com/ASPN/Mail/Message/boost/1686928 Q: Is the object file produced by compiling a source file which contains #include <boost/any_old_header.hpp> a derived work? A: Yes. However, the license explicitly grants the right to distribute object code derivative works (the result of compiling source which includes boost files) without the boost license. Q: So I can apply my own choice of license terms to the object code? A: Yes. Is this legally and "intently" correct? Regards Darryl Green. ########################################################################## This e-mail is for the use of the intended recipient(s) only. If you have received this e-mail in error, please notify the sender immediately and then delete it. If you are not the intended recipient, you must not use, disclose or distribute this e-mail without the author's prior permission. We have taken precautions to minimise the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses. ##########################################################################

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Has mailing list 'from' address changed?
by Steve Folly 28 Feb '04

28 Feb '04

I'm not catch boost-users digest anymore with my mail rules? Vol 129 issue 3 from lists.boost.org, has a date stamp of 17:01:03. I've received a second copy from www.osl.ie.edu at 17:01:50. Is this a permanent change? -- Regards, Steve.

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Re: Iterator adaptor interoperability
by Kris Braun 28 Feb '04

28 Feb '04

Dave Abrahams wrote: > Your best bet is to write an type generator: > template <class Iterator> > struct simple_iterator > { > typedef boost::transform_iterator< > do_nothing< typename Iterator::value_type > > , Iterator > > type; > }; Thank you for the quick and clear reply! I'm now having a very similar problem with a slightly more complicated example (that builds on the first): template< class Iterator > struct harder_iterator { typedef simple_iterator< Iterator >::type inner_type; typedef boost::indirect_iterator< inner_type > type; static type Create( const Iterator& iter ) { return type( inner_type( iter ) ); } }; This "composite" iterator not only has problems with comparison, but assignment from non-const to const as well. Is there a way to handle this case? Thanks, Kris __________________________________ Do you Yahoo!? Yahoo! Mail SpamGuard - Read only the mail you want. http://antispam.yahoo.com/tools

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building boost 1.31.0
by Greg Silverman 27 Feb '04

27 Feb '04

Hi, I have not been able to build version 1.31.0. I run bjam -sTOOLS=gcc-nocygwin Basically, I get a lot of undefined references from the linker. The linker cannot find "cpp_main", "init_unit_test_suite", and, so on. It seems to be a problem with the testing, regression testing, unit testing, etc. Greg Silverman Northrop Grumman San Jose, CA

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lambda / boost usage questions
by Luis De la Parra 26 Feb '04

26 Feb '04

hello, I don't have much experience with boost, so I'm having problems getting boost lambda to work...hope someone here can point me in the right direction. I have: class Song {public: string artist( ) const { return m_artist } string title( ) const { return m_title } private: string m_artist, m_title; } typedef boost::shared_ptr<Song> pSong; vector<pSong> c; and I am trying to use lambda to find a song in c which matches a certain artist and title...something like iterator it = find_if( c.begin(), c.end(), something ) but I havn't figured out what "something" should look like I've tried find_if(begin(),end(), (_1->artist() == "a1" && _1->title = "t1" ) ); but the compiler -- or I =) -- doesn't seem to know the type of _1 --> error: base operand of `->' has non-pointer type `const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >' If I try it = find_if(begin(),end(), boost::bind(&Song::artist,_1) == "a1" ); it fails because "_1" is ambiguos (defined as lambda/placeholder and boost/arg ) using boost::lambda::bind (and not including the "normal" bind ) gives a bunch cryptic errors... I've tried several other variants with lambda / lambda::bind / boost::bind but I havn't figured it out... can anyone help me out? I'd also like to know what's the difference between boost::bind and boost::lambda::bind ? Also... is there a way to know when a lambda object is going to be constructed?, it's probably just that I don't know much about the BLL, but in cases where you have several nested lambdas and binds, I'm not sure which lambda objects will get constructed. regards, luis

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bug in numeric_cast<unsigned long>, <unsigned char>, and <unsigne d int> in gcc 3.3.2
by King, William D 26 Feb '04

26 Feb '04

Hello, I am seeing a bug that the regression tests miss for numeric_cast<unsigned long> with gcc 3.3.2. Specifically, the following code is throwing an exception: double small_value = 1.25; unsigned long l=0; l = numeric_cast<unsigned long>(small_value); // throws exception! unsinged char c=0; c = numeric_cast<unsigned char>(small_value); // throws exception! I am under the impression that numeric_cast is supposed to accept losses of precision (by truncating the fractional values), and to throw exceptions only if there is a range or sign error. Is this so? This error happens only when I try to cast a value with a non-zero fraction; i.e. 1.25 breaks but 1.0 is fine. It only occurs for unsigned types -- signed int, char, and long appear to work correctly. I have found the same incorrect behavior with gcc 3.3.2 on both solaris and linux. Using sunpro on solaris, the same code runs correctly. The regression tests don't catch this, since they only test numeric_cast with integral values 1 and LONG_MAX. Any ideas? It looks like a compiler problem to me. Davis King william.d.king(a)bankofamerica.com

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Boost.Test and Threads
by p.klotz＠icoserve.com 26 Feb '04

26 Feb '04

Hi After our migration from Boost 1.30.2 to Boost 1.31.0 several multithreaded tests no longer work stable. We tracked it down to the macros BOOST_UT_LOG_BEGIN and BOOST_UT_LOG_END. When one protects this macro calls with a mutex, the tests work stable again. After the investigation we found 'Support for the testing of multithreaded programs.' on the open issues list of Boost.Test. Does this mean that Boost.Test is not thread-safe at all? Do we misuse Boost.Test by calling things like BOOST_CHECK_EQUAL, BOOST_CHECK and BOOST_REQUIRE concurrently from different threads? Any clarification on this topic is welcome. Best regards, Peter.

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newbie doubts in compilation process
by Gustavo Sánchez 26 Feb '04

26 Feb '04

Hi all, I am newbie in Boost libraries, and I'm specially interested in Graph Library (BGL). I'm working with VC++ 6.0 and I have a couple of questions about usign the library under this SDK. Of course I've read the Boost documentation and I know VC++ 6 doesn't pass the regresion test but I'm doubty about the compilation process. Those are the steps I followed: 1.- I did the outlined comands in getting started cd boost_1_31_0 bjam "-sTOOLS=msvc" install As result I obtained in drive C: a boost dir with "include" and "libs" subdirs and boost_date_time-vc6-mt-1_31.dll boost_date_time-vc6-mt-gd-1_31.dll boost_filesystem-vc6-mt-1_31.dll boost_filesystem-vc6-mt-gd-1_31.dll boost_regex-vc6-mt-1_31.dll boost_regex-vc6-mt-gd-1_31.dll boost_signals-vc6-mt-1_31.dll boost_signals-vc6-mt-gd-1_31.dll boost_thread-vc6-mt-gd-1_31.dll and the related .lib files. Why aren't there any .dll file of the others libraries(graph, math, type_traits...)??? 2.- I executed bjam in directory: BOOST_ROOT\libs\graph\test and what I obtained was empty directories like BOOST_ROOT\bin\boost\libs\graph\test\vector_graph_cc.test\msvc\debug just one for every test source. I supose that is due to VC++ 6.0 is not able to compile the BGL, is that the reason??? I get something similar if I executed bjam in directory: BOOST_ROOT\libs\graph\examples 3. I did that ---> A full set of tests and status tables can be run thusly on a Windows system: cd %BOOST_ROOT%\status bjam --dump-tests test >bjam.log 2>&1 start notepad bjam.log (this is just a cut of the full file ilustrating the output related to graph library) boost-test(COMPILE) "property_iter" : "libs\graph\test\property_iter.cpp" boost-test(COMPILE) "copy" : "libs\graph\test\copy.cpp" boost-test(COMPILE) "vector_graph_cc" : "libs\graph\test\vector_graph_cc.cpp" boost-test(RUN) "isomorphism" : "libs\graph\test\isomorphism.cpp" boost-test(RUN) "subgraph" : "libs\graph\test\subgraph.cpp" boost-test(COMPILE) "reverse_graph_cc" : "libs\graph\test\reverse_graph_cc.cpp" boost-test(COMPILE) "graph_concepts" : "libs\graph\test\graph_concepts.cpp" boost-test(RUN) "graph" : "libs\graph\test\graph.cpp" boost-test(COMPILE) "filtered_graph_cc" : "libs\graph\test\filtered_graph_cc.cpp" boost-test(COMPILE) "edge_list_cc" : "libs\graph\test\edge_list_cc.cpp" boost-test(COMPILE) "dijkstra_cc" : "libs\graph\test\dijkstra_cc.cpp" boost-test(COMPILE) "dfs_cc" : "libs\graph\test\dfs_cc.cpp" boost-test(RUN) "dfs" : "libs\graph\test\dfs.cpp" boost-test(COMPILE) "bfs_cc" : "libs\graph\test\bfs_cc.cpp" boost-test(RUN) "bfs" : "libs\graph\test\bfs.cpp" boost-test(COMPILE) "adj_matrix_cc" : "libs\graph\test\adj_matrix_cc.cpp" boost-test(COMPILE) "adj_list_cc" : "libs\graph\test\adj_list_cc.cpp" boost-test(RUN) "transitive_closure_test" : "libs\graph\test\transitive_closure_test.cpp" What is quite surprising to me because it's suposed VC++ can't compile all BGL, http://boost.sourceforge.net/regression-logs/cs-win32.html. Some explanation about this ??? Thanks a lot ...(I continue diving in ) --------------------------------- Antivirus Filtros antispam 6 MB gratis ¿Todavía no tienes un correo inteligente?

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