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BGL: adding vertex index property to listS listS adjacency list with with bundled attributes
by Sean Kelly 21 Mar '05

21 Mar '05

> Hi All, > > I'm trying to figure out how to add a vertex index property to the > following listS, listS adjacency list so I can use write_graphviz > > typedef boost::adjacency_list<boost::listS, > boost::listS, > boost::bidirectionalS, > > boost::shared_ptr<Sysgen::Visitable> > XTreeGraph; > > thanks for any help. > > - Sean > > Sean Kelly Ph.D, Sr. Software Engineer -- Xilinx Inc.

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trim BUG??
by Groleo Marius 21 Mar '05

21 Mar '05

hello int main(){ string str1="\t \nhello world! "; trim_if(str1, is_any_of("\t") ); // str1 == "hello world!" trim_if(str1, is_any_of("\n") ); // str1 == "hello world!" cout << str1; } I get the following output: #> hello world! #> Isn't it supposed to be: #> hello world! #> ??? -- Regards, Groleo! .''`. # touch universe : :' : # chmod +rwx universe `. `'` # ./universe `- Debian - when you have better things to do than fix a system

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Locking mechanisms other than scoped_lock
by Leon Mergen 21 Mar '05

21 Mar '05

Hello, I'm currently trying to achieve the following: A series of threads handle jobs (threads A). Of each of these jobs, in the end, a statistics object is placed in a container. This container will later be read-from by another thread (thread B), dedicated to continuously reading statistics data from other threads, and parse those statistics. Now, since it is very well possible a thread handles at least 1,000 jobs before statistics data is actually read from, I want it to hold a mutex lock to the data at all time. The class also has an internal volatile boolean, which flags whether another thread (thread B) wants to read from the container. If so, the writing thread (threads A) releases the lock, after which thread B will pick up the lock and write the data and resets the boolean flag. After releasing the lock, threads A will immediately try to re-acquire the lock. However, as far as I can see, for this approach, a scoped_lock will not be the most fantastic solution ? Or am I missing something really crucial about the scoped_lock being able to hold a lock outside a certain scope ? :) Thanks in advance for any suggestions about a locking type... :) Regards, Leon Mergen http://www.solatis.com/

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Errors building CVS root sources with VC8
by Keith MacDonald 21 Mar '05

21 Mar '05

I have just done a checkout boost from cvs.sourceforge.net and tried to build with VC8 (cl version 14.0.40607.16) and Microsoft Platform SDK for Windows XP SP2, using the following commands: tools\build\jam_src\build.bat tools\build\jam_src\bin.ntx86\bjam "-sTOOLS=vc-8_0" This resulted in lots of these warnings: option 'Og' has been deprecated option 'Gs' has been deprecated ignoring unknown option '/MLd' ignoring unknown option '/ML' I read that Jam V2 should fix those, but I cannot see how to build it. More serious was the following compilation error: lexical_cast.hpp(150): error C2679: binary '>>' : no operator found which takes a right-hand operand of type 'std::basic_string<_Elem,_Traits,_Ax>' That file hasn't changed since last September, so am I wasting my time trying to use VC8? Thanks, Keith MacDonald

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[Boost.Test] Link error, need to be pointed in the right direction
by Peter Foley 21 Mar '05

21 Mar '05

Hi, (Apologies if this gets through twice, I think my mail client used the wrong email address the first time) Thanks for taking the time to read through this. First things first: I am using Visual C++ 2005 Express Edition, I have compiled boost version 1.32. I have included the path to the include directory and the lib files directory. Boost is working I have managed to compile and run a number of the other examples (including linking against the libs created during the bjam process (eg boost.threads). The code that has the link error was taken from: http://www.boost.org/libs/test/doc/components/utf/getting_started/index. html --Code-- #include <boost/test/unit_test.hpp> using namespace boost::unit_test; test_suite* init_unit_test_suite( int argc, char* argv[] ) { test_suite* test= BOOST_TEST_SUITE( "const_string test" ); return test; } // EOF --End Code-- The comment at the end of the code suggests that I can compile this code with no errors. Now for the errors: -- Build Log Output -- ------ Build started: Project: Test, Configuration: Debug Win32 ------ Compiling... const_string_test.cpp Linking... const_string_test.obj : error LNK2019: unresolved external symbol "public: __thiscall boost::unit_test::test_suite::test_suite(class boost::unit_test::basic_cstring<char const >)" (??0test_suite@unit_test@boost@@QAE@V?$basic_cstring@$$CBD@12@@Z) referenced in function "class boost::unit_test::test_suite * __cdecl init_unit_test_suite(int,char * * const)" (?init_unit_test_suite@@YAPAVtest_suite@unit_test@boost@@HQAPAD@Z) LIBCMTD.lib(crt0.obj) : error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup Debug/Test.exe : fatal error LNK1120: 2 unresolved externals Build log was saved at <--SNIPPED LOG PATH--> Test - 3 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== -- End Build Log Output -- I know it is probably something really simple but for the life of me I am just missing it =/. Let me know if you need any more information. Thanks for any advice you can give. Peter.

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How to build the giallo socket library?
by Paul Elliott 20 Mar '05

20 Mar '05

Does anyone know the procedure for building the giallo socket library in the boost sandbox? I was able to checkit out of CVS but I was not able to figure out the build procedure. I asked on the giallo mailing list with no response. Perhaps the project has gone dormant? Is boost fixin to have a socket library in the future? -- Paul Elliott 1(512)837-1096 pelliott(a)io.com PMB 181, 11900 Metric Blvd Suite J http://www.io.com/~pelliott/pme/ Austin TX 78758-3117

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Can't compile basic boost.python program
by Derakon 20 Mar '05

20 Mar '05

I'm following the Boost.python tutorial, and having some problems with compiling, of all things. Here's the file I'm trying to compile: #include <boost-1_32/boost/python.hpp> char const* greet() { return "Hello, world!"; } using namespace boost::python; BOOST_PYTHON_MODULE(hello) { def("greet", greet); } And here's the compilation error: % make g++ -g -Wall -pedantic -I/usr/local/include/boost-1_32 -c -o test.o test.cpp In file included from /usr/local/include/boost-1_32/boost/python/detail/prefix.hpp:13, from /usr/local/include/boost-1_32/boost/python/args.hpp:8, from /usr/local/include/boost-1_32/boost/python.hpp:11, from test.cpp:1: /usr/local/include/boost-1_32/boost/python/detail/wrap_python.hpp:30:23: pyconfig.h: No such file or directory /usr/local/include/boost-1_32/boost/python/detail/wrap_python.hpp:54:24: patchlevel.h: No such file or directory /usr/local/include/boost-1_32/boost/python/detail/wrap_python.hpp:57:2: #error Python 2.2 or higher is required for this version of Boost.Python. /usr/local/include/boost-1_32/boost/python/detail/wrap_python.hpp:121:21: Python.h: No such file or directory In file included from /usr/local/include/boost-1_32/boost/python/cast.hpp:13, from /usr/local/include/boost-1_32/boost/python/handle.hpp:10, from /usr/local/include/boost-1_32/boost/python/args_fwd.hpp:10, from /usr/local/include/boost-1_32/boost/python/args.hpp:10, from /usr/local/include/boost-1_32/boost/python.hpp:11, from test.cpp:1: /usr/local/include/boost-1_32/boost/python/base_type_traits.hpp:24: error: ` PyObject' was not declared in this scope /usr/local/include/boost-1_32/boost/python/base_type_traits.hpp:25: error: template argument 1 is invalid /usr/local/include/boost-1_32/boost/python/base_type_traits.hpp:26: confused by earlier errors, bailing out make: *** [test.o] Error 1 As near as I can figure, my install of Boost got screwed up. Does anyone else have a different interpretation? -Chris Weisiger

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unordered_map/hash_table bug?
by Martin Wartens 20 Mar '05

20 Mar '05

Hi, has anybody tried the implementation of unordered map that can be found at http://groups.yahoo.com/group/boost/files/jtc1-sc22-wg21-2003-n1456.tar.gz ? I believe there is a bug in the rehash function of the underlying hash_table. The new bucket indices are computed using the old number of buckets. That means that the items stored in these buckets cannot be found anymore later. I checked my hash function and it seems to be right. The bug doesn't seem to show if the trivial hash function that comes with this package is used (maps val->val). BTW: what is the reason behind burying potentially useful code in a place where nobody can find it? (I mean the "yahoo groups") Is there still life in the development of this package? Martin ___________________________________________________________________________ Sagen Sie nicht, wir hätten Sie nicht gewarnt! http://my-mail.ch/?redirect=9901 Online-Gewinnspiel mit 1'000 Sofortpreisen im Wert von CHF 40'000! http://my-mail.ch/?redirect=1779

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result_of tutorial
by Ian McCulloch 19 Mar '05

19 Mar '05

I'm sure this has been asked before, but searching the archives I cannot find anything. Is there some tutorial material on result_of anywhere? The boost documentation simply points to n1454, which doesn't contain much in the way of examples, and the TR1 document (n1647) which has no examples at all. Cheers, Ian

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Problem with boost/iterator_facade.hpp on HP-UX
by Thomas Matelich 19 Mar '05

19 Mar '05

Global namespace pollution strikes again. /usr/include/machine/reg.h defines a symbol R1, which messes up boost/iterator_facade.hpp. I'm not sure what the boost policy is on stuff like this, name change or #undef. I went with name change. I just changed all R1's to Ref1's and R2's to Ref2's (for consistency). If you'd like a patch, I can submit one, but its a pretty simple fix. Oh, and I'm using 1.32 Thanks, Tom

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