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Graph, inv_adjacency_iterator_generator problem
by Peter Aronsson 10 Mar '04

10 Mar '04

Hi, I have a problem with traversing over all parents of a vertex. If I use (the undocumented?) inv_adjacency_iterator_generator class to return iterators for the parents (predecessors) of a vertex I get a compile error. It worked on an earlier version of the library (in debian testing), but does not work for the latest version(1.31.0). I think the problem is that it can no longer find a suitable constructor. Here is my code: // some typedefs removed...... typedef boost::graph_traits<TaskGraph>::in_edge_iterator InEdgeIterator; typedef boost::adjacency_list<boost::listS, boost::listS, boost::bidirectionalS, VertexProperty, EdgeProperty> TaskGraph; typedef boost::inv_adjacency_iterator_generator<TaskGraph, VertexID, InEdgeIterator>::type ParentsIterator; std::pair<ParentsIterator, ParentsIterator> parents(VertexID v, TaskGraph &tg) { InEdgeIterator e,e_end; tie(e,e_end) = in_edges(v,tg); ParentsIterator c(e),c_end(e_end); // problem here. No suitable constructor. return make_pair(e,e_end); } (Traversing through the children/predecessors works fine.) Regards Peter Aronsson -- _________________________________________________________________ / Peter Aronsson, Phd Student at PELAB (Programming Environments \ | Laboratory ) Department for Computer & Information Science | | Linköping University, Sweden | |=================================================================| | petar(a)ida.liu.se , phone +46 (0)13-28 1737 Room 3B:490 | \_________________________________________________________________/

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mpl lambda facilities
by Matt Calabrese 10 Mar '04

10 Mar '04

I'm trying to create a metafunction which takes in a boost::mpl::vector containing spirit parser types, and yields a vector of the original vector's length plus one with each element representing the parser type made of the recursive boost::spirit::alternative of all of the original parser types from the corresponding element in the original vector and an epsilon_parser at the end. in other words, the metafunction should be able to take in: (using boost::mpl and boost::spirit) vector< chlit<>, strlit<>, range<> > and yield a result: vector< alternative< chlit<>, alternative< strlit<>, alternative< range<>, epsilon_parser > > >, alternative< strlit<>, alternative< range<>, epsilon_parser > >, alternative< range<>, epsilon_parser >, epsilon_parser > where empty is my own parser type, similar to epsilon_parser I'm still new to metaprogramming and the mpl lambda facilities and I'm having some trouble creating a metafunction which produces my desired type. This is what I've come up with, though it doesn't work - I'm assuming because of my second use of mpl::_1 in the nested template parameter of mpl::front in mpl::push_front (which I'd like to have represent the current state of the mpl::fold). template< typename vector_t > struct get_alternatives { typename mpl::fold_backward< vector_t, mpl::vector< epsilon_parser >, typename mpl::push_front< mpl::_1, spirit::alternative< mpl::_2, typename mpl::front< mpl::_1 >::type > >::type >::type type; }; Any help is greatly appreciated. Thanks in advance.

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boost::thread and std::system
by Jerry Swan 10 Mar '04

10 Mar '04

I'd like to be able to issue a call to std::system that will time-out after a specified period. Is it possible to achieve this using the boost::threads library? If so could someone kindly sketch how this might be achieved? TIA, Jerry.

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python library issue migrating from boost_1_30_2 to boost_1_31_0
by Marco Donizelli 09 Mar '04

09 Mar '04

Hi there, when I built the 1_30_2 Python Library, I got: libboost_python.so now, with 1_31_0, I get several libs but that one: libboost_python-gcc-1_31.a libboost_python-gcc-1_31.so libboost_python-gcc-1_31.so.1.31.0 libboost_python-gcc.a libboost_python-gcc-d-1_31.a libboost_python-gcc-d-1_31.so libboost_python-gcc-d-1_31.so.1.31.0 libboost_python-gcc-d.a libboost_python-gcc-d.so libboost_python-gcc-mt-1_31.a libboost_python-gcc-mt-1_31.so libboost_python-gcc-mt-1_31.so.1.31.0 libboost_python-gcc-mt.a libboost_python-gcc-mt-d-1_31.a libboost_python-gcc-mt-d-1_31.so libboost_python-gcc-mt-d-1_31.so.1.31.0 libboost_python-gcc-mt-d.a libboost_python-gcc-mt-d.so libboost_python-gcc-mt.so libboost_python-gcc.so Unless I made a mistake in the building step which prevented libboost_python.so to be created, the first solution that comes to my mind to solve this backward compatibility problem would be to create a symlink from libboost_python.so to one of the new libraries. The question is, what would you recommend: libboost_python-gcc.so or libboost_python-gcc-mt.so (or none of the above, but....) thanks a million marco

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RE: [Boost-users] Re: install? and simple thread program.
by Duong, Sanh N. 08 Mar '04

08 Mar '04

I downloaded the latest version of Python from the website given below and ran it with "rpm --rebuild python2-2.2-2.src.rpm." Python seems to install correctly. I reset my env variables to PYTHON_ROOT=/usr and PYTHON_VERSION=2.2. Yet when I ran bjam, it would say it couldn't find the Python.h file within /usr/include/python2.2/. The directory is there, but its empty. There is an another directory for python1.5. But this version will not compile Boost correctly. Any suggestions or idea of why this is happening? Thanks. Sanh. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of David Abrahams Sent: Monday, March 08, 2004 1:53 PM To: boost-users(a)lists.boost.org Subject: [Boost-users] Re: install? and simple thread program. "Duong, Sanh N." <SANH.N.DUONG(a)saic.com> writes: >> On Fri, 5 Mar 2004, Michael Glassford wrote: >> >>> "Duong, Sanh N." <SANH.N.DUONG(a)saic.com> wrote in message >>> >> The Boost.Python example should still work just fine, if you follow >> the instructions. bjam doesn't use the mangled library names when >> building with cross-project dependencies. It worked for me just >> now. I went into libs/python/example and did > >> bjam test > >> and everything passed. No funky linking should is needed. > > When running bjam test, in libs/python/example I'd get a lot of errors about > templates and vars not define. Let's see a few of them. > Another thing I noticed, when installing > boost with > > bjam "-sGXX=g++" "-sTOOLS=gcc" "--prefix=/home/boost_1_31_0" install > > it would say, "Skipping Boost.Python library build due to missing or > incorrect configuration couldn't find Python.h in "/include/python" Right. > When I point the PYTHON_ROOT and PYTHON_VERSION to the correct path, I'd get > a lot of errors when compiling. Is there a step I'm missing here? Hard to say without seeing the errors. My guess is that you didn't set them correctly. Did you follow the directions at http://www.boost.org/libs/python/doc/building.html ?? -- Dave Abrahams Boost Consulting www.boost-consulting.com _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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RE: [Boost-users] Re: install? and simple thread program.
by Duong, Sanh N. 08 Mar '04

08 Mar '04

> On Fri, 5 Mar 2004, Michael Glassford wrote: > >> "Duong, Sanh N." <SANH.N.DUONG(a)saic.com> wrote in message >> news:6A47CB4A48D1EA49A6F7AB618490D649069D8C3C@mcl-its-exs03.mail.saic.com... >> > All, >> > >> > Does anyone have an example of how to install boost and bjam? >> >> See the recently much improved Getting Started guide: >> http://boost.org/more/getting_started.html. > > After you follow those instructions, boost will still not work. > Even if you were right, I think you're painting with too broad a > brush here. But I think you're wrong. > You'll need to create links to all of the mangled library names. For > example, in my case all of the libraries have either "gcc" or > "gcc_1_31" mangled in. However, the examples (or more specifically > the boost.python example) assume that the libraries have unmangled > names. > The Boost.Python example should still work just fine, if you follow > the instructions. bjam doesn't use the mangled library names when > building with cross-project dependencies. It worked for me just > now. I went into libs/python/example and did > bjam test > and everything passed. No funky linking should is needed. When running bjam test, in libs/python/example I'd get a lot of errors about templates and vars not define. Another thing I noticed, when installing boost with bjam "-sGXX=g++" "-sTOOLS=gcc" "--prefix=/home/boost_1_31_0" install it would say, "Skipping Boost.Python library build due to missing or incorrect configuration couldn't find Python.h in "/include/python" When I point the PYTHON_ROOT and PYTHON_VERSION to the correct path, I'd get a lot of errors when compiling. Is there a step I'm missing here? Sanh.

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Compiler Generator Tools
by Hossein Haeri 08 Mar '04

08 Mar '04

Dear all, Who knows where I can find the compiler generation stuff in the Boost repository? I need scaner, lexical analyser, compiler, code generator, ... Are there any such tools in the Boost which can build all of the above goodies for me? TIA, --Hossein __________________________________ Do you Yahoo!? Yahoo! Search - Find what you�re looking for faster http://search.yahoo.com

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Mac OS X link problem
by Adam H. Pendleton 07 Mar '04

07 Mar '04

I am using the Boost libraries, specifically the Spirit portions, on Mac OS X Panther, using XCode. Every time I try to compile my program with the Boost libraries I get a linker error: ld: warning prebinding disabled because of undefined symbols ld: Undefined symbols: boost::throw_exception(std::exception const&) Even if I link against all the boost libraries that were created, I still can't get this program to link. The documentation talks about the libraries being compiled with or without BOOST_NO_EXCEPTIONS, but they don't indicate that the program won't link in either case. What am I doing wrong? ahp

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Boost Users: Review Schedule/Upcoming Reviews
by Jeff Garland 06 Mar '04

06 Mar '04

Below is the most recent updates to the reviews. If you have an interest in these libraries please get involved and submit a review. Library Author Review Mgr Dates Circular Buffer Jan Gaspar Pavel Vozenilek 2004 Mar 5-15 Indexed Set Joaquín M López Muñoz Pavel Vozenilek 2004 Mar 20-30 Assignment Thorsten Ottosen Tom Brinkman 2004 Apr 1-11 Serialization Robert Ramey Jeff Garland 2004 Apr 13-20 Container Traits Thorsten Ottosen Hartmut Kaiser 2004 Apr 28-May 7 Tribool Douglas Gregor - - More IO Daryle Walker - - Iostreams Jonathan Turkanis - - Output Formatters Reece Dunn - - Pointer Containers Thorsten Ottosen - - Named Params David Abrahams & Daniel Wallin - - Wave Hartmut Kaiser - -

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Changing case with regex_format
by Keith MacDonald 06 Mar '04

06 Mar '04

The following useful Perl expressions seem to have been omitted from regex_format: \l lowercase next char \u uppercase next char \L lowercase till \E \U uppercase till \E \E end case modification Was there a good reason for that? The only way I can see to implement those expressions is to take a copy of regex_format.hpp, then hack _reg_format_aux. I think that it would also be necessary to change the undocumented regex_traits class, to do upper case conversion, as it only seems to do lower casing at present. Is there an easier way? Thanks, Keith MacDonald

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