January 2003 - Boost-users - lists.preview.boost.org

RE: [Boost-Users] [BGL] missing include in boost/graph/kruskal_mi n_spanning_tree.hpp
by bjorn.karlsson＠readsoft.com 13 Jan '03

13 Jan '03

> From: Jeppe N. Madsen [mailto:yg-boost-users@m.gmane.org] > > Hi, > > kruskal_min_spanning_tree uses bgl_named_params defined in > boost/graph/named_function_params.hpp, which is not included.... Fixed in CVS. Thanks! Bjorn

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BGL: filtered graphs, write_graphviz, and out of memory messages
by sa3h1n <sa3h1n＠yahoo.com> 13 Jan '03

13 Jan '03

Hi all: I am seeing a strange interaction between filtered graphs and write_graphviz. Briefly, if I try to write out a filtered graph via write_graphviz, compilation ends with an out-of-memory message. A necessary condition for this to happen is that the value_type of the property map I am filtering cannot be of a native type -- int is ok, std::string is not. Example code is appended below. I am using Codewarrior Dev Tools 8.0 on WinXP Pro. Given that the code does not even compile, I am not sure how to move beyond this point. Any ideas? TIA, - S ----------------------------------------------------------------- #include "boost/config.hpp" #include <fstream.h> #include <iostream> // for std::cout #include <utility> // for std::pair #include <algorithm> // for std::for_each #include "boost/utility.hpp" // for boost::tie #include "boost/graph/graph_traits.hpp" // for boost::graph_traits #include "boost/graph/adjacency_list.hpp" #include "boost/graph/graphviz.hpp" #include "boost/graph/filtered_graph.hpp" using namespace boost; namespace boost { enum edge_prop_t { edge_prop = 389457 }; BOOST_INSTALL_PROPERTY(edge, prop); } template <typename T> struct positive_edge_prop { positive_edge_prop() {}; positive_edge_prop(T t) : m_prop(t) {}; template <typename Edge> bool operator() (const Edge& e) const { return "foo" == get(m_prop, e); } T m_prop; }; int main(void) { // create an edge property // if std::string is replaced with int, and some attendant changes are made, the code compiles typedef property<edge_prop_t, std::string> EdgeProperty; // create a simple graph type typedef adjacency_list<vecS, vecS, bidirectionalS, no_property, EdgeProperty> Pgraph; enum { A, B, C, D, E, F, N }; const int num_vertices = N; typedef std::pair<int, int> Edge; Edge edge_array[] = { Edge(A, B), Edge(B, C), Edge(C, D), Edge(D, E), Edge(E, F), Edge(F, A), }; const int num_edges = sizeof(edge_array)/sizeof(edge_array[0]); Pgraph pg(edge_array, edge_array + num_edges, num_vertices); // Add edge properties typedef boost::property_map<Pgraph, edge_prop_t>::type ewt; ewt ew = get(edge_prop_t(), pg); boost::graph_traits<Pgraph>::edge_iterator ei, ei_end; boost::tie(ei, ei_end) = edges(pg); for (ei; ei != ei_end; ei++) put(ew, *ei, "bar"); std::map<std::string,std::string> graph_attr, vertex_attr, edge_attr; boost::write_graphviz(std::cout, pg); positive_edge_prop<ewt> filter(get(edge_prop_t(), pg)); filtered_graph<Pgraph, positive_edge_prop<ewt> > fg(pg, filter); boost::write_graphviz(std::cout, fg); // if this line is commented out, the code compiles just fine return 0; } -----------------------------------------------------------------

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Next release date???
by Alejandro Escalante Medina 13 Jan '03

13 Jan '03

Does anyone have an idea for the date of the next release??? Thanks, Alex _________________________________________________________ Do You Yahoo!? La mejor conexión a internet y 25MB extra a tu correo por $100 al mes. http://net.yahoo.com.mx

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Problem with g++ 2.95.3 and boost-example file_dependencies.cpp
by Michael Brinkmann 12 Jan '03

12 Jan '03

Hi, I am trying to get the "file_dependencies"-example compiled and running with the g++-version mentioned above. But, in the function "dijkstra_shortest_paths_no_init()" an exception is thrown and the program terminates prematurely. When hunting the bug with gdb, I get the message "Cannot access memory at address ..." for the parameter "weight", perhaps this is the reason for the exception. Is this a known problem? Will an upgrade to a higher g++-version help me, or has someone another hint? Thanks in advance Michael

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threads - using boost.threads in win32 without use of dll?
by Phil Nash 12 Jan '03

12 Jan '03

Hi, I understand that on the win32 platforms boost.threads requires a dll to be build - threadmon. I seem to remember that this is there as a workaround to help support thread local storage (but I can't seem to find mention of it in the docs now, so I am not 100% sure of this). If this is the case, is it possible to use boost.threads *without* the dll if thread local storage is not being used? Regards, [)o IhIL..

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boost::signal and thread-safety
by svanechel <svanechel＠yahoo.com> 11 Jan '03

11 Jan '03

Hi, The signal FAQ says that currently boost::signals aren't thread-safe. I'm guessing this applies to connecting/disconnecting slots from different threads and calling a signal from multiple threadsl, right? If synchronize access when connecting slots and make sure that only a single thread calls a certain signal, can I then use boost::signal to fire events from objects that do processing in a worker thread? As a secondary question: how far in the future will this thread- safety support be added? Thanks in advance, Sven

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[BGL] missing include in boost/graph/kruskal_min_spanning_tree.hpp
by Jeppe N. Madsen 11 Jan '03

11 Jan '03

Hi, kruskal_min_spanning_tree uses bgl_named_params defined in boost/graph/named_function_params.hpp, which is not included.... rgds Jeppe

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(no subject)
by Wilken, Marc 11 Jan '03

11 Jan '03

Hello, does anyone knows, if a construct like out(blitz::Range(0,2))=inp(blitz::Range(0,2)); (that means accesing and assigning of matrix/vector ranges) exist for boost::numeric::ublas too? Marc This e-mail contains confidential information for the exclusive attention of the intended addressee. Any access of third parties to this e-mail is unauthorised. Any use of this e-mail by unintended recipients such as copying, distribution, disclosure etc. is prohibited and may be unlawful. When addressed to our clients the content of this e-mail is subject to the General Terms and Conditions of GL's Group of Companies applicable at the date of this e-mail. GL's Group of Companies does not warrant and/or guarantee that this message at the moment of receipt is authentic, correct and its communication free of errors, interruption etc.

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BGL, vertex_iterators, listS vs vecS
by sa3h1n <sa3h1n＠yahoo.com> 11 Jan '03

11 Jan '03

BGL gurus: I would like to use listS for vertex and edge lists because of iterator stability. However, if I run the following code: ------------ // use listS typedef adjacency_list<listS, listS> Pgraph; // use vecS typedef adjacency_list<vecS, vecS> Pgraph2; int num_vertices = 2; Pgraph pg (num_vertices); boost::graph_traits<Pgraph>::vertex_iterator vi, vi_end; boost::tie(vi, vi_end) = vertices(pg); Pgraph2 pg2 (num_vertices); boost::graph_traits<Pgraph2>::vertex_iterator vi2, vi_end2; boost::tie(vi2, vi_end2) = vertices(pg2); for (vi, vi2; vi != vi_end && vi2 != vi_end2; vi++, vi2++) { std::cout << *vi << std::endl; std::cout << *vi2 << std::endl; } ------------ I get the following output: ------------ 0x00146e60 <- this is *vi which uses listS 0 <- this is *vi2 which uses vecS 0x00146e78 <- this is *vi which uses listS 1 <- this is *vi2 which uses vecS ------------ One of the problems with this is when I try to display the graph using write_graphviz. Vertex indices turn out be 0x0014e60 etc instead of nice numbers like 0, 1, etc. Tracing execution through the debugger, it appears that vi and vi_end are of type generic_iterator(), whereas vi2 and vi2_end are of type iterator_adaptor() defined in boost/iterator_adaptors.hpp . Unfortunately, this is where my c++ expertise peters out. So what is happenning here? And is there anything I can do to ensure iterator stability while using vecS? Any help will be much appreciated, S

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Re: [boost] boost version 1.27 and 1_25_0
by David Abrahams 10 Jan '03

10 Jan '03

Chunhui Pan <chpan(a)milkyway.gsfc.nasa.gov> writes: > Hi, > > If anyone can give an instruction on how to build > boost 1.27 lib and boost_1_25_0 lib on Red Hat7.2? 1.27 instructions are at: http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/*checkout*/boost/boost/tools… And 1.25 instructions are at: http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/*checkout*/boost/boost/tools… HTH, -- David Abrahams dave(a)boost-consulting.com * http://www.boost-consulting.com Boost support, enhancements, training, and commercial distribution

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multi_array dinamically built
by Ramón Casero Cañas 10 Jan '03

10 Jan '03

Hi, I would like to dinamically create a multi_array. Something like typedef boost::multi_array<bool, 2> BoolMatrix; typedef boost::multi_array<bool, 2>::index indexBoolMatrix; boost::array<BoolMatrix::index, 2> shape = {{ 5, 8 }}; BoolMatrix *A; // NO MEMORY ALLOCATED ... A = new BoolMatrix(shape); // MEMORY ALLOCATED A.assign(data,data+40); // ELEMENTS INITIALIZED The compiler (gcc 2.95.4) says that this kind of things are wrong. Or didn't I understand how the memory allocation in multi_array works? Cheers, Ramón.

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NEWBIE - building on linux
by gcs_99 <gregsteele＠woodsidenet.com> 10 Jan '03

10 Jan '03

Can anyone point me to directions for building boost under linux. I have installed bjam. When I type bjam -sTOOLS=gcc in my boost root dir I get tons of errors. I understand that much of boost is implemented as templates in header files. Is there an install script to place these in the correct location for gcc? Thanks. G

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request for solaris/forte toolset jamfile
by Dr Bruce Lowery <bruce_lowery＠yahoo.com> 10 Jan '03

10 Jan '03

If anyone has a somewhat working jamfile for solaris/forte, could you post a copy of it? --bruce

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Installing boost regex
by Alisdair Meredith 10 Jan '03

10 Jan '03

We're (still!) in the process up upgrading our software to the latest borland compiler, BCB6 I am now at the stage of trying to get the boost libraries integrated into our builds. After running bjam I get some libboost_regex libs, but these don't seem to be used. Reading the separate install procedure under the regex library, I find another install procedure that produces a set of libraries targetted at BCB that do solve my problems. Is this the correct procedure? Is there any way to integrate this with the jam scripts in the future? If not, should we add a link under installing boost to the separate procedure for the regex libraries? -- AlisdairM Team Thai Kingdom

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stop a thread
by hlh771 <hlh771＠yahoo.com.cn> 10 Jan '03

10 Jan '03

How to stop(or cancel) a thread? Suppose I have a main thread and a worker thread, the worker thread does something looply,and when the main thread get a message indicating the process should exit, I want stop the worker thread,how to do that?I have read other thread library,their thread class supply a method called stop or cancel which stops the thread. Their Implementation is:the thread class has a data member indicating whether the thread should stop,and the thread function looply check the data member whether the thread should stop.Generally the data member's type is a bool or Event. Is it the best way to stop the thread? How the boost to deal with this? Thanks in advance.

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Starting to use unit tests
by Scott Nesbitt 10 Jan '03

10 Jan '03

I am in to process of adding the boost test framework to our project, and am looking for advice or samples for how best to do this. Specifically, we have multiple executables sharing several libraries. I was thinking about having a different test suite for each library, but don't see much documentation on using multiple test suites. Any advice or pointers? Thanks, Scott Nesbitt scott.nesbitt(a)yahoo.com __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com

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bind() and argument_type?
by Duane Murphy 09 Jan '03

09 Jan '03

I am trying to use bind() with std::not1() (I think this is what I want to do :-). But std::not1() gets a compiler error because bind doesnt have an argument_type typedef. bool is_something( int x, int y ) { return something( x, y ); } { ... if ( std::not1( boost::bind( is_something, 3, _1 ) ) ) { // not something } } Am I approaching this incorrectly? Does bind support argument_type? Thanks for the advice, ...Duane

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RE: [Boost-Users] Problem with BOOST_STATIC_ASSERT
by Randy Bowen 09 Jan '03

09 Jan '03

Thanks to John and Richard Cox for investigating this. > You will be pleased to know that it works correctly with VC7.1. > > John Maddock.

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RE: [Boost-Users] Problem with BOOST_STATIC_ASSERT
by Randy Bowen 09 Jan '03

09 Jan '03

Thanks for investigating this, John. I don't have access to the beta VC7.1 compiler. Do you (or does anyone else) know if this will still be a problem with the forthcoming version of the Microsoft compiler? Randy Bowen -----Original Message----- From: John Maddock [mailto:john_maddock@compuserve.com] Sent: Wednesday, January 08, 2003 4:17 AM To: Boost-Users(a)yahoogroups.com Subject: Re: [Boost-Users] Problem with BOOST_STATIC_ASSERT > Some further follow-up on this. I've created a minimal program that > exhibits the new problem behavior: > > /******************************************/ > #include <boost/type_traits.hpp> > #include <boost/static_assert.hpp> > > template < typename ValueType > > struct A > { > BOOST_STATIC_ASSERT(boost::is_integral<ValueType>::value); > }; > > extern "C" int main(int argc, char* argv[]) > { > return 0; > } > /******************************************/ > > The fact that this assertion fails is counter-intuitive to me, since > there is no instantiation to compile. Note that this behavior seems > limited to the use of "is_integral" as the type predicate. Constructing > a similar program using "is_POD" behaves as expected: I can reproduce that with both VC6 and VC7, all the other compilers I have access to are OK with it. It's clearly a compiler bug, because the assert is triggered even though no instance of the template class is ever created. Unfortunately I don't have any kind of workaround :-( John Maddock http://ourworld.compuserve.com/homepages/john_maddock/index.htm Yahoo! Groups Sponsor ADVERTISEMENT 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 the Yahoo! Terms of Service.

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RE: [Boost-Users] Problem with BOOST_STATIC_ASSERT
by richard_cox＠dell.com 09 Jan '03

09 Jan '03

On Wednesday, January 08, 2003 5:29 PM, Randy Bowen [mailto:rbowen@stamps.com] wrote: > -----Original Message----- > From: > Sent: > To: Boost-Users(a)yahoogroups.com > Subject: RE: [Boost-Users] Problem with BOOST_STATIC_ASSERT > > > Thanks for investigating this, John. I don't have access to > the beta VC7.1 compiler. Do you (or does anyone else) know > if this will still be a problem with the forthcoming version > of the Microsoft compiler? > > Randy Bowen > > > > -----Original Message----- > From: John Maddock [mailto:john_maddock@compuserve.com] > Sent: Wednesday, January 08, 2003 4:17 AM > To: Boost-Users(a)yahoogroups.com > Subject: Re: [Boost-Users] Problem with BOOST_STATIC_ASSERT > > > > Some further follow-up on this. I've created a minimal > program that > > exhibits the new problem behavior: > > > > /******************************************/ > > #include <boost/type_traits.hpp> > > #include <boost/static_assert.hpp> > > > > template < typename ValueType > > > struct A > > { > > BOOST_STATIC_ASSERT(boost::is_integral<ValueType>::value); > > }; > > > > extern "C" int main(int argc, char* argv[]) > > { > > return 0; > > } > > /******************************************/ > > > > The fact that this assertion fails is counter-intuitive to > me, since > > there is no instantiation to compile. Note that this > behavior seems > > limited to the use of "is_integral" as the type predicate. > Constructing > > a similar program using "is_POD" behaves as expected: > > I can reproduce that with both VC6 and VC7, all the other > compilers I have access to are OK with it. It's clearly a > compiler bug, because the assert is triggered even though no > instance of the template class is ever created. Unfortunately > I don't have any kind of workaround :-( > > John Maddock > http://ourworld.compuserve.com/homepages/john_maddock/index.ht m The code as quoted built without error OK on VC++7.1 RC2 (Final Beta) here... using snapshot of boost taken last weekend. Richard Cox Senior Software Developer Dell Technology Online All opinions and statements mine and do not in any way (unless expressly stated) imply anything at all on behalf of my employer

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Re: [Boost-Users] Re: Re: Slight Alteration to Boost Directory Structure
by William E. Kempf 09 Jan '03

09 Jan '03

> From: "Simon Bailey <conic(a)bigpond.com>" <conic(a)bigpond.com> > --- In Boost-Users(a)yahoogroups.com, "Paul Mensonides" <yg-boost- > users@m...> wrote: > > "William E. Kempf" <wekempf@c...> wrote in message > > > > > That still misses the point. Boost currently won't help you to > install > > the library, but installation certainly wouldn't entail copying the > entire > > $BOOST_ROOT tree to the $INCLUDE directory on your system. You'd > only copy > > the $BOOST_ROOT/boost tree there. > > > > Yes, and this is why I said that it hasn't been a problem for me. > However, > > I see where the OP is coming from as well. > > > > Paul Mensonides > > Paul understands me correctly. I confused the issue by making two > requests at once. > > Mainly, I want to include other libraries alongside boost and provide > a single include path. That is the first wish. Bill has pointed out > that I could move BOOST_ROOT/boost into my INCLUDE directory. I > didn't know that - I thought it might break things. > > The second thing I was suggesting (and this is quite minor) was that > we make the change to include smart_ptr.hpp (etc.) and thread.hpp > (etc.) at the same directory level. I thought that the > subdirectories (like /thread) were the way of the future. I didn't > realise that the plan was to move all the headers into > BOOST_ROOT/boost. > > So it seems my first wish is not needed and my second wish is already > on the drawing board. :-) No, it's never been planned to move all headers into $BOOST_ROOT/boost. That would be problematic at best. The headers are in subdirectories to avoid name clashes, and that's how it should be for large libraries and/or libraries that use common names. What many of these libraries do, and what Boost.Threads will do with the next release, however, is to have a *single* include header in $BOOST_ROOT/boost that includes all the other headers from the specific sub-library. This (mostly) avoids the dangers of name clashes, gives a simple single include file for many uses, yet retains the ability for users to include only what they need to in order to reduce compilation time, etc. For example, both of the following would be legal: #include <boost/thread/thread.hpp> #include <boost/thread/mutex.hpp> #include <boost/thread/condition.hpp> // ... code using boost::thread, boost::mutex and // boost condition - or - #include <boost/thread.hpp> // ... code using boost::thread, boost::mutex and // boost condition William E. Kempf wekempf(a)cox.net

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Re: [Boost-Users] Re: Re: Slight Alteration to Boost Directory Structure
by William E. Kempf 09 Jan '03

09 Jan '03

> From: "Simon Bailey <conic(a)bigpond.com>" <conic(a)bigpond.com> > Suddenly I remember why I wanted the directory structure change... > > I could achieve what I want by moving BOOST_ROOT/boost into my > INCLUDE directory. But the disadvantage with that is that I need to > perform a move operation. > > *** In my current development environment, my source control > directory structure mirrors my release directory structure exactly. > *** > > So, in source control I have: > > /include > --/BOOST_ROOT > ----/boost <- headers are here > --/my_lib <- headers are here > > But, in my release I want to have: > /include > ----/boost <- headers are here > ----/my_lib <- headers are here > > I was suggesting the change so that source control and relase could > be the same. This would necessitate that documentation and source > for boost would have to be within the boost (include) directory. > Some might find that a worse alternative I suppose. I think most would. I know I do. William E. Kempf wekempf(a)cox.net

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which boost lib to use for generic list sort by member function ?
by Philippe Guglielmetti 09 Jan '03

09 Jan '03

I try to define a "sortby" method that would sort a list using any member function that fits some constraints (taking no parms, returning a result that can be compared using the > operator and being const) I wrote this: template <class T> class mylist:public std::list<T> { // ... template <typename T2, typename R, R (T2::*F)() const> struct cmp: public std::binary_function<T,T,bool> { bool operator()(const T& f1, const T& f2) {return (f1.F)() > (f2.F)();}; }; template <typename T2, typename R> bool sortby(R (T2::*F)() const) { sort(cmp<T,R,F>()); return true; }; }; // class mylist using VC6 (I know...) I get these 3 errors: algos.h(356) : error C2440: 'specialization' : cannot convert from 'double (__thiscall cadoo::cadFace::*)(void) const' to 'double (__thiscall cadoo::cadFace::*)(void)' algos.h(356) : error C2975: 'cmp' : invalid template argument for 'F', constant expression expected algos.h(356) : error C2514: 'dyl::List<class cadoo::cadFace>::cmp<class cadoo::cadFace,double,0>' : class has no constructors any idea ? I also checked boost.org for help on functors, lambda ... but could not figure out how to use them simply for my application. thanks! Philippe Guglielmetti

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Boost::python + vc + sgistl problem
by yg-boost-users＠m.gmane.org 09 Jan '03

09 Jan '03

I use Boost::Python module with VC and SGI stl. But I got some compile errors like mix\max redefine.... Who know how to solve this problem??? -- CNews 0.4

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HELP: Command line sample.
by Lichun Bao 09 Jan '03

09 Jan '03

Hi, Can someone please provide a sample single command line compile using g++ that generates the final executable binary for a test example? For example, in the unpacked BOOST directory, how to do something like: g++ <options> libs/graph/example/bfs-example.cpp -o \ /tmp/bfs-example for the final executable? Thanks, Lichun

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