November 2004 - Boost-users

abort when constructing filesystem::path object
by Richard Wolf 30 Nov '04

30 Nov '04

Hi I'm trying to use the filesystem library, and I get an abort when trying to initialise a path object with a string containing a space. #include <boost/filesystem/path.hpp> #include <iostream> int main() { boost::filesystem::path p1("hello"); std::cout << p1.string(); boost::filesystem::path p2("hello world"); std::cout << p2.string(); } when run, this prints: helloAborted I couldn't find anything saying that the string path constructor can't contain a space. Am I doing something wrong, or is this a bug? Using gcc 3.3.4 on Debian. thanks, Richard

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[Q] Which compiler tool for MSVC 2005 (Beta)
by Michael Peterson 30 Nov '04

30 Nov '04

I have MSVC 2005 (Beta) installed and was wondering with what compiler toolset, if any, should I use to build boost 1_32_0? Also, any advice as to whether I should use Microsoft's stl or the open source version (I have 4.6.2)? Thanks, Michael

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Help: Building Boost with Different Compiler Options
by Paul Dubuc 30 Nov '04

30 Nov '04

I'm trying to build Boost 1.32 on Solaris 8 (SPARC) with GCC 3.3.4. I want to build a 64-bit version of the libraries and this requires pasing the -m64 option to the compiler. How do I tell bjam to do this? I've tried: export TOOLSET_OPT="-sGCC_ROOT_DIRECTORY=${GCCDIR} -exec-prefix=${PWD}/${GCCVERSION}/64 \"\"-sGXX=g++ -m64\"\" \"\"-sGCC=gcc -m64\"\"" ... bjam ${TOOLSET_OPT} \ -sTOOLS=${TOOLSET} \ --prefix=${PWD}/.. \ --with-python-root=/projects/gnu/sparc-sun-solaris8 \ install It dosn't seem to work. I still get 32-bit libraries. Help would be appreciated, Thanks. -- Paul M. Dubuc

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Re: [Boost-users] Errors when playing with lambda (1.32.0, VC7.1)
by John.Wismar＠autozone.com 30 Nov '04

30 Nov '04

"Peter Dimov" <pdimov(a)mmltd.net> wrote: > You are trying to invoke the non-const member > function Foo::print on a const Foo. and > You didn't call the function: (&_1->*&Foo::print)(). Thanks for the reply! Both seem obvious once the errors have been pointed out, but I was not making any headway by reading the error messages (in the first case) or stepping through the code execution (in the second).... I'll keep working with it. Thanks again!! -------------------------------- John Wismar john.wismar(a)autozone.com

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Errors when playing with lambda (1.32.0, VC7.1)
by John.Wismar＠autozone.com 30 Nov '04

30 Nov '04

I'm taking a look at the Lambda library, and writing some toy programs, and I keep coming up with errors, and I can't figure out what the problems are.... Example 1: This works as expected: using namespace boost::lambda; class Foo { public: void print() { std::cout << "Foo::print()\n"; } }; template <class Container, class Function> Function for_all(Container cont, Function f) { return std::for_each(cont.begin(), cont.end(), f); } int main(int argc, char* argv[]) { std::vector<Foo> vec; //Fill vec for_all(vec, (bind(&Foo::print, _1))); return 0; } If I change the declaration of for_all to take the container by const reference, I get errors [See Error 1 pasted in below]: using namespace boost::lambda; class Foo { public: void print() { std::cout << "Foo::print()\n"; } }; template <class Container, class Function> Function for_all(Container const &cont, Function f) { return std::for_each(cont.begin(), cont.end(), f); } int main(int argc, char* argv[]) { std::vector<Foo> vec; //Fill vec for_all(vec, (bind(&Foo::print, _1))); return 0; } Example 2: It looks from the docs like I should be able to rewrite the bind expression above using operator ->*, like so: for_all(vec, (&_1 ->* &Foo::print)); And, in fact this compiles cleanly (regardless of whether the container is passed by value or by const reference). Foo::print() never gets called, though. What am I doing wrong or not understanding here? Thanks in advance!!! -------------------------------- John Wismar john.wismar(a)autozone.com ------------------------------------------------------------------------------------------------------------- [Error 1] c:\dev\alldata\Dev\3rd Party\boost\boost\lambda\detail\actions.hpp(87) : error C2665: 'boost::lambda::function_adaptor<Func>::apply' : none of the 2 overloads can convert parameter 2 from type 'const std::allocator<_Ty>::value_type' with [ Func=boost::lambda::return_type_N<boost::lambda::function_action<2>,boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>::sig<boost::tuples::tuple<const std::allocator<Foo>::value_type &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>::rets_t>::plain_Func ] and [ _Ty=Foo ] c:\dev\alldata\Dev\3rd Party\boost\boost\lambda\detail\function_adaptors.hpp(193): could be 'Result boost::lambda::function_adaptor<Func>::apply<RET>(Result (__thiscall Foo::* )(void),Object *)' with [ Result=void, Func=boost::lambda::return_type_N<boost::lambda::function_action<2>,boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>::sig<boost::tuples::tuple<const std::allocator<Foo>::value_type &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>::rets_t>::plain_Func , RET=boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boo st::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>::sig<boost::tuples::tuple<const std::allocator<Foo>::value_type &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>::type, Object=Foo ] c:\dev\alldata\Dev\3rd Party\boost\boost\lambda\detail\function_adaptors.hpp(197): or 'Result boost::lambda::function_adaptor<Func>::apply<RET>(Result (__thiscall Foo::* )(void),Object &)' with [ Result=void, Func=boost::lambda::return_type_N<boost::lambda::function_action<2>,boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>::sig<boost::tuples::tuple<const std::allocator<Foo>::value_type &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>::rets_t>::plain_Func , RET=boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boo st::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>::sig<boost::tuples::tuple<const std::allocator<Foo>::value_type &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>::type, Object=Foo ] while trying to match the argument list '(const rt0 , const std::allocator<_Ty>::value_type)' with [ _Ty=Foo ] c:\dev\alldata\Dev\3rd Party\boost\boost\lambda\detail\lambda_functor_base.hpp(408) : see reference to function template instantiation 'RET boost::lambda::function_action<I>::apply<RET,U,const Foo>(A1 & ,A2 &)' being compiled with [ RET=boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>::sig<boost::tuples::tuple<const std::allocator<Foo>::value_type &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>::type, I=2, U=const rt0, A1=const rt0, A2=const std::allocator<Foo>::value_type ] c:\dev\alldata\Dev\3rd Party\boost\boost\lambda\detail\lambda_functors.hpp(148) : see reference to function template instantiation 'RET boost::lambda::lambda_functor_base<Act,Args>::call<boost::lambda::lambda_functor_base<Act,Args>::sig<SigArgs>::type,A,const boost::tuples::null_type,const boost::tuples::null_type,const boost::tuples::null_type>(A &,B &,C &,Env &) const' being compiled with [ RET=boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>::sig<boost::tuples::tuple<const std::allocator<Foo>::value_type &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>::type, Act=boost::lambda::action<2,boost::lambda::function_action<2>>, Args=boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::typ e,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>, SigArgs=boost::tuples::tuple<const std::allocator<Foo>::value_type &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>, A=const std::allocator<Foo>::value_type, B=const boost::tuples::null_type, C=const boost::tuples::null_type, Env=const boost::tuples::null_type ] c:\DevTools\VS.NET2003\Vc7\include\algorithm(21) : see reference to function template instantiation 'boost::lambda::lambda_functor_base<Act,Args>::sig<SigArgs>::type boost::lambda::lambda_functor<T>::operator ()<const std::allocator<_Ty>::value_type>(A &) const' being compiled with [ Act=boost::lambda::action<2,boost::lambda::function_action<2>>, Args=boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>, SigArgs=boost::tuples::tuple<const std::allocator<Foo>::value_type &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>, T=boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<b oost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>, _Ty=Foo, A=const std::allocator<Foo>::value_type ] c:\Temp\LambdaTest\LambdaTest.cpp(29) : see reference to function template instantiation '_Fn1 std::for_each<std::vector<_Ty>::const_iterator,Function>(_InIt,_InIt,_Fn1)' being compiled with [ _Fn1=boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>, _Ty=Foo, Function=boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>, _InIt=std::vector<Foo>::const_iterator ] c:\Temp\LambdaTest\LambdaTest.cpp(35) : see reference to function template instantiation 'Function for_all<std::vector<_Ty>,boost::lambda::lambda_functor<T>>(const Container &,Function)' being compiled with [ Function=boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>, _Ty=Foo, T=boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<const boost::lambda::detail::bind_traits<void (__thiscall Foo::* const )(void)>::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>, Container=std::vector<Foo> ]

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Help with serializating an abstract object
by Jeffrey Holle 29 Nov '04

29 Nov '04

I'm running into trouble handling an abstract object in my attempt to apply boost.serialization to my application. Since it doesn't have state, initially I didn't add serialize methods to this class, and got compilization errors for want of these methods. Next, I added noop methods, and got errors because the serialization package attempted to construct an abstract class. I see there is an is_abstract template, but don't know how to employ it. Can somebody give me some pointers? Note that I've choosen to implement non-templated serialize methods, using a forwared reference of the desired archive classes. Should this template be in the definition file, or implementation file (inside or outside the serialize method(s))?

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Problem with including boost/serialization/shared_ptr.hpp
by Jeffrey Holle 29 Nov '04

29 Nov '04

I'm attempting to apply the boost::serialization library to my application. Because it is fairly large, I've choosing to implement the serialize methods as non-templates. Such a tactic is used in some of the examples, for instance demo_polymorphic_A.hpp. This means that I don't include any boost.serialization or boost.archive headers in my definition files. A forward reference to the specific archive object is made instead. I've run into trouble with an object wrapped in a shared_pointer. To solve this, I've attempted to defined the BOOST_SHARED_POINTER_EXPORT() macro in this object's definition file. This necessitates including boost/serialization/shared_ptr.hpp. The problem is no matter what position I place this include file in this *.h file, I get the following error. boost/serialization/shared_ptr.hpp:26:2: #error "include <boost/serialization/shared_ptr> first This is a self reference, what is it trying to say? In other words, what do I have to include before boost/serialization/shared_ptr.hpp to make it happy?

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howto store vertex-iterators as internal graph property?
by Sebastian Weber 29 Nov '04

29 Nov '04

Hi folks! I got a cyclic type-dependency problem. I am trying to let every vertex store a iterator to a list which stores vertex-iterators. This sounds weired, but I need to keep track of very few vertices within my graph which have a particle located at it. Thus I created a list of vertex-iterators who carry my particle positions in the graph. In order to be able to tell quickly if a vertice is taken by a particle I want each vertice to include a pointer to a null element representing the absence of a particle or a pointer into that list. My non-working code looks like: Definition of my graph: struct Spot { // acutally I need the vertex_iterator to be defined already // in order to define particle, but this is not yet defined // so I am using the knowledge that it is going to be represented // by a vector<std::size_t>::iterator (at least I hope so) // this assumption is WRONG!! typedef std::list< std::vector<std::size_t>::iterator >::iterator \\ particle_t; particle_t particle; }; typedef boost::adjacency_list<boost::vecS, boost::vecS, \\ boost::undirectedS, Spot > graph_t; Here I initialise my particles to be distributed in the graph object bg. m_posA is of type: std::list<RandomGraph::gtraits::vertex_iterator> // first initialise every position to the null-flag for(; vi != vend; ++vi) bg[*vi].particle = Spot::particle_t(); // now place particles at random positions boost::tie(vi, vend) = boost::vertices(bg); for(std::size_t i = 0; i < initialA; i++) { std::size_t pos; //aList_t::iterator iter; // find a random empty vertice do { pos = rand_gen(); } while(bg[pos].particle != m_posA_end); // place particle A there RandomGraph::gtraits::vertex_iterator vref = vi + pos; // put returns an iterator to the list-element where // vref has been stored bg[pos].particle = m_posA.put(vref); } Any help would be great. Thanks in adavance. Greetings, Sebastian Weber

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[OSX] Multiply defined symbols between Function and Signals libs ?
by Alo Sarv 29 Nov '04

29 Nov '04

Hi I'v been compiling boost libraries objects straight into my application binaries on linux and OSX platforms (e.g. not using bjam/stat/dynlibs), and thus far it has worked. However, recently I started getting multiply defined symbols on OSX, namely _1, _2, _3 etc. Most likely they come between Boost.Function and Boost.Signals libraries (latter of which I started using recently). My question is is it inherently bad idea to compile boost objects like this straight into application binary (e.g. should I always use bjam?), or there any other workarounds to avoid those multiple symbols on OSX ? Alo Sarv.

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Re: Re: Graph library - bundled properties for edge
by TC MA 29 Nov '04

29 Nov '04

Thank you for your answer. I don't know '*first' will give an edge_description already. > TC MA wrote: > > > G[source(*first, G)].y << " joins " << > > G[target(*first, G)].x << "," << G[target(*first, > > G)].y << " weight " << G[edge(*first)].weight << endl; > > ++first; > > What's the 'edge' function and why do you call it? What about just '*first', > which gives you an edge_description already? > > - Volodya ===== TingChong Ma ______________________________________________________________________ Post your free ad now! http://personals.yahoo.ca

1 0