July 2002 - Boost-users - lists.boost.org

Installation problems
by fauzia_sharmeen 28 Jul '02

28 Jul '02

Hi, After downloading and unzipping the Regex library with the -d option, I ran nmake -fvc6.mak on the command prompt.However, I am getting an error message saying "Variable MSVCDIR not set". I checked the VcVars32.bat file to verify that the variable MSVCDIR has been set properly. Any ideas/suggestions about what I am doing wrong would be most appreciated. Thanks, Fauzia

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Iterator problem with adjacent_vertices
by EJ van Eijk 28 Jul '02

28 Jul '02

Hello, I'm currently implementing some algorithms for drawing graphs, using boost::graph. PropertyMaps e.a. are working like a charm, but for my algorithm I need to find the adjacent vertices. Now I've become stuck on the following: typedef boost::adjacency_list < boost::mapS, boost::vecS, boost::undirectedS, VertexProperty, EdgeProperty> Graph; typedef boost::graph_traits<Graph>::vertex_descriptor Vertex; class functor { ... void operator()(Vertex& v) { ... }; }; for_each(adjacent_vertices(u,g).first, adjacent_vertices(u,g).second, functor<Graph>(g)); complains about foo.cc:30: initialization of non-const reference type `Vertex &' foo.cc:30: from rvalue of type `unsigned int' But, when using vertices(g) instead of adjacent_vertices(v,g), the code compiles, and applies functor to each vertex. What am I missing? The documentation is quite thorough, but I'm lost at the moment... EJ

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Re: [Boost-Users] XML
by dick.bridges＠tais.com 26 Jul '02

26 Jul '02

What you say is true. In fact, it's *STILL* true. In the meantime, Xerces has released version 1.7.0 and, most recently, version 2.0. I've been following the Xalan mail lists and comments from some of the developers suggest that co-ordination between the two groups could be better. This "thread" probably belongs on xalan-c-users(a)xml.apache.org. Mail me direct to continue. Albrecht Fritzsche <albrecht.fritzsche@tisc To: Boost-Users(a)yahoogroups.com ali-dsl.de> cc: Subject: Re: [Boost-Users] XML 07/26/2002 11:33 AM Please respond to Boost-Users dick.bridges(a)tais.com wrote: > Unfortunately, the Xerces and Xalan projects don't appear to > be all that well co-ordinated. Makes it difficult to stay both > current and compatible. Huh - why do you think that? Simply reading the FAQ gives me "The Xalan-C++ release notes includes information about the Xerces-C++ release with which the Xalan-C++ release has been coordinated and tested." and even the Readme says "Xalan-C++ version 1.3 has been tested with Xerces-C++ version 1.6.0. Each Xalan-C++ version 1.3 download includes the Xerces-C++ distribution for the specified platform." Curious Ali Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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RE: [Boost-Users] XML
by dick.bridges＠tais.com 26 Jul '02

26 Jul '02

Xerces is ok for xml+namespaces but if you want to use additional facilities (e.g., XPath, XSLT, etc.) you'll have to go to other packages like Xalan. Unfortunately, the Xerces and Xalan projects don't appear to be all that well co-ordinated. Makes it difficult to stay both current and compatible. It sure would be nice to have a "boost-level" C++ library for xml but I'm not sure we could sell the idea that it should be "part of" C++. Hope I'm wrong. schalk_cronje@na i.com To: Boost-Users(a)yahoogroups.com cc: 07/26/2002 10:14 Subject: RE: [Boost-Users] XML AM Please respond to Boost-Users > I'm writing an XML based project right now. I haven't been > able to find > any good, open source XML parser to incorporate into my > application, so I What's wrong with Xerces? Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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RE: [Boost-Users] Re: [boost] Iterator Adaptor Poll
by Mark Storer 26 Jul '02

26 Jul '02

May i recommend providing both the "hello world" grade example, and something more real-world... like that path token iterator you mentioned? --Mark Storer Software Engineer Cardiff Software #include <disclaimer> typedef std::disclaimer<Cardiff> Discard;

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Re: [boost] Iterator Adaptor Poll
by David Abrahams 26 Jul '02

26 Jul '02

From: "Toon Knapen" <toon.knapen(a)si-lab.org> > > Sure, I'm all for toys, as in "this doesn't really do everything I'd want > > from a real example, but it shows me how the system works". The problem I > > have with ia_experiment.cpp is that my first reaction was "why would anyone > > want an "iterator" which does *that*?" The fact that it iterates over only > > two elements and stores its value internally is pretty weird. I think most > > people who have only seen the standard iterators would have a hard time > > imagining that this is also an iterator. Though technically, it is an > > iterator, it's so different in nature from most iterators that it seems > > like it would be completely foreign. > > > > What about a singly-linked-list iterator example? Wouldn't that show > > everything you're illustrating, but more transparently? > > Why not some kind of rotation iterator. The advantage of this example is that > there's a std::rotate in the STL which modifies the container whereas the > rotation_iterator_adaptor can give you the same result but withouth modifying > the containers. AFAICT this is a strong argument in favour of the IA. That's neat, but we already have the permutation adaptor, and I don't think it's really a simple enough example. Beman's example just makes a simple iterator, not an adaptor, and I think that's an important feature for a "hello, world"-type introduction. -Dave ----------------------------------------------------------- David Abrahams * Boost Consulting dave(a)boost-consulting.com * http://www.boost-consulting.com

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XML
by J.M. Thompson 26 Jul '02

26 Jul '02

I'm writing an XML based project right now. I haven't been able to find any good, open source XML parser to incorporate into my application, so I am using MSXMLDOM. This is a bummer. It seems like a good XML database manager would be a valuable addition to the Boost libraries. Is anyone working on one?

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[thread] All tests crashing...
by Christophe Galerne 26 Jul '02

26 Jul '02

Hi, OS: cygwin uptodate Boost: 1.28 C++ comp: g++ 2.95.3-5 After what appears like a warning | error free compilation of the thread library. I'm trying to compile the examples, like this: $ g++ -I/data/boost_1_28_0 -o monitor monitor.cpp /data/boost_1_28_ 0/libs/thread/build/bin/libboost_thread.lib/gcc/release/runtime-link- static/threading-multi/libboost_thread.lib Which compiles fine, however when trying to run the example, I get: $ ./monitor.exe Segmentation fault (core dumped) This happening with all the examples, I'm guessing that I must be doing something wrong... =:-D At the same time I'm doing not doing anything particularly wacky so if someone could point my obvious mistake. Do I need to link against boost_threadmon also? Tia, Christophe

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RE: [Boost-Users] XML
by schalk_cronje＠nai.com 26 Jul '02

26 Jul '02

> I'm writing an XML based project right now. I haven't been > able to find > any good, open source XML parser to incorporate into my > application, so I What's wrong with Xerces?

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Re: [Boost-Users] Re: [boost] Iterator Adaptor Poll
by David Abrahams 26 Jul '02

26 Jul '02

From: "Kresimir Fresl" <fresl(a)grad.hr> > > Jeremy Siek wrote: > > > On Fri, 26 Jul 2002, David Abrahams wrote: > > > dave> Don't you think people will find an iterator which traverses the > > dave> elements of a real sequence to be more-obvious? That's why I'm > > dave> suggesting the singly-linked list iterator. > > > The singly-linked list example was the second thing that popped into my > > mind... I like that a lot too. Perhaps we should do both :) > > What about `strided_iterator', i.e. iterator that with each > increment/decrement skips given number of elements in > a sequence? Testing for `end' can be interesting ;o) Yes, too interesting. We're looking for a simple "hello, world" example here. ----------------------------------------------------------- David Abrahams * Boost Consulting dave(a)boost-consulting.com * http://www.boost-consulting.com

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