January 2006 - Boost-users - lists.preview.boost.org

[BGL] Help with initialization of graph from image
by Jef Driesen 25 Jan '06

25 Jan '06

I'm trying to create a graph from an image, where pixel values are regions labels. I have defined my graph to use lists instead of the vectors (because I need to add/remove vertices and edges) and one extra property for the vertex (the region label): typedef boost::adjacency_list< boost::listS, // Adjacency list boost::listS, // Vertex list boost::undirectedS, // Undirected graph unsigned int, // Vertex property (=label) boost::no_property, // Edge property boost::no_property, // Graph property boost::listS // Edge list > graph; typedef boost::graph_traits<graph>::vertex_descriptor vertex_t; typedef boost::graph_traits<graph>::edge_descriptor edge_t; I have the following pseudo code to populate the graph: graph g; for each pixel (i,j) { unsigned int u_label = image[i][j]; for each neighbourhood pixel (k,l) { unsigned int v_label = image[k][l]; if (u_label != v_label) { // Find/add both vertices vertex_t u = boost::add_vertex(u_label,g); vertex_t v = boost::add_vertex(v_label, g); // Find/add edge boost::add_edge(u, v, g); } } } But this creates many duplicates (with regard to the label) for both vertices and edges. How can i prevent this? Would using a set for the edges solves my problem? And how can I add a vertex only if it does not exist already?

2 3

[serialization] How to serializa reference counted C arrays?
by Lukasz Dobrek 25 Jan '06

25 Jan '06

Basically can anybody give me a hint how to properly serialize this class, using boost serialization library? Regards Lukasz class A { public: A( int size ) : m_size( size ) { m_ref_count = new int; *m_ref_count = 1; m_vec = new double [ m_size ]; } ~A(){ (*m_ref_count)--; if ( *m_ref_count == 0 ){ delete m_vec; } } A( const A & a ) : m_size ( a.m_size ) , m_ref_count( a.m_ref_count ) , m_vec( a.m_vec ) { (*m_ref_count)++; } int * m_ref_count; double * m_vec; int m_size; };

1 0

Re: [Boost-users] thread library
by Sohail Somani 24 Jan '06

24 Jan '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Jens Theisen > Sent: Tuesday, January 24, 2006 10:33 AM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] thread library > > monade wrote: > > > Ok, it may be no memory leak, but only a harmless resource leak (as > > Alexandrescu calls it in his singleton chapter), but I don't like it > > anyway (my own singletons does not leak). > > If there would be a delete in the destructor, you would not > gain anything: > The destructor of a singleton is conceptually called on program > termination and that's also where all resources are freed by > the operating > system anyway. So it's perfectly reasonable to not free it. I could've sworn we just went through this a few months back. Perhaps its time to put a comment that links to the appropriate boost mailing thread. http://lists.boost.org/boost-users/2005/08/13538.php Might be related?

3 2

[GRAPH] How to use an external edge weight map in dijkstra_shortest_paths
by rohit wadhwa 24 Jan '06

24 Jan '06

Hi, I am a newbie and have been struggling over the past couple of days with dijkstra_shortest_paths. I want to use WeightMap as an external property. I create the Graph as follows typedef boost::adjacency_list<boost::vecS,boost::vecS, boost::directedS,boost::no_property, boost::property<boost::edge_index_t, std::size_t> > Graph; I added edges using add_edge(fromVertex, toVertex, edge_index, Graph); My edge_index can have any long value and they are not necessarily in sequence. Also, I want to create the weight map on the fly and want to use a std::map. I have tried all sorts of things but to no avail. Any help will be appreciated. Thanks, Rohit.

1 0

[iostreams] non-copyable device with Boost.Ref pattern
by Pedro Lamarão 24 Jan '06

24 Jan '06

Here follows a simple pattern to use Boost.IOstreams with your non-copyable Device, allowing you quick access to formatted input and output: #include <boost/iostreams/stream.hpp> #include <boost/ref.hpp> #include "foo_device.hpp" /* Don't; just to make lines shorter. */ using boost::iostreams; using boost; class foo_device; class foo_stream_base { public: /* Define constructor forwarding to foo_device. */ foo_stream_base (...) : _M_device(...) {} protected: foo_device _M_device; }; class foo_stream : private foo_stream_base, public stream<reference_wrapper<foo_device> > { public: /* Define constructor forwarding to foo_device. */ foo_stream (...) : foo_stream_base(...), stream<reference_wrapper<foo_device> >(ref(_M_device)) {} }; -- Pedro Lamarão Desenvolvimento Intersix Technologies S.A. SP: (55 11 3803-9300) RJ: (55 21 3852-3240) www.intersix.com.br Your Security is our Business

1 1

boost::iostreams - access object 'below' the stream
by Leon Mergen 24 Jan '06

24 Jan '06

Hello, Little question: I'm toying around to replace my socket_stream class with a boost::iostreams::stream class to implement a more generic approach... now, I use the socket file descriptor/handle as a unique identifier in my application, and so far this could easily be retrieved; however, when the boost::iostreams::stream "layer" is on top of my socket class, this is pretty much inaccessable. What is the most common approach to handle this problem ? I really don't want to resort to some kind of tuple which describes the stream and the handle, but at the moment, a construction like that is the only thing my mind can come up with... any suggestions ? Thanks in advance for any reactions. Regards, Leon Mergen

2 1

[lambda] "Invalid use of void expression"
by David A. Greene 24 Jan '06

24 Jan '06

I'm having some trouble with BLL and Boost.Function in this simple testcase: #include <boost/lambda/bind.hpp> #include <boost/function.hpp> #include <iostream> class Test { public: void foo(int a) { std::cout << "a is " << a << std::endl; }; }; template<typename Function> class Caller { private: Function func; public: Caller(Function f) : func(f) {}; void bar(void) { func(); }; }; int main(void) { Test tester; int value = 10; Caller<boost::function<void (void)> > printer(boost::lambda::bind(boost::lambda::bind(&Test::foo, tester, boost::lambda::_1), value)); printer.bar(); return(0); } The g++ 4.0.3 compiler complains (full trace below): /usr/include/boost/lambda/detail/lambda_functor_base.hpp:408: error: invalid use of void expression Is it not legal to bind a lambda-bound function? -Dave ---------------------- /usr/include/boost/lambda/detail/lambda_functor_base.hpp: In member function 'RET boost::lambda::lambda_functor_base<boost::lambda::action<2, Act>, Args>::call(A&, B&, C&, Env&) const [with RET = boost::tuples::null_type, A = const boost::tuples::null_type, B = const boost::tuples::null_type, C = const boost::tuples::null_type, Env = const boost::tuples::null_type, Act = boost::lambda::function_action<2, boost::lambda::detail::unspecified>, Args = boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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>]': /usr/include/boost/lambda/detail/lambda_functors.hpp:140: instantiated from 'typename T::sig<boost::tuples::null_type>::type boost::lambda::lambda_functor<Base>::operator()() const [with T = boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> >]' /usr/include/boost/function/function_template.hpp:136: instantiated from 'static void boost::detail::function::void_function_obj_invoker0<FunctionObj, R>::invoke(boost::detail::function::any_pointer) [with FunctionObj = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void]' /usr/include/boost/function/function_template.hpp:479: instantiated from 'void boost::function0<R, Allocator>::assign_to(FunctionObj, boost::detail::function::function_obj_tag) [with FunctionObj = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:430: instantiated from 'void boost::function0<R, Allocator>::assign_to(Functor) [with Functor = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:294: instantiated from 'boost::function0<R, Allocator>::function0(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:637: instantiated from 'boost::function<R ()(), Allocator>::function(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void, Allocator = std::allocator<void>]' lambda3.cc:27: instantiated from here /usr/include/boost/lambda/detail/lambda_functor_base.hpp:408: error: invalid use of void expression /usr/include/boost/lambda/detail/actions.hpp: In static member function 'static RET boost::lambda::function_action<3, T>::apply(A1&, A2&, A3&) [with RET = void, A1 = void (Test::* const)(int), A2 = const Test, A3 = const boost::tuples::null_type, T = boost::lambda::detail::unspecified]': /usr/include/boost/lambda/detail/lambda_functor_base.hpp:425: instantiated from 'RET boost::lambda::lambda_functor_base<boost::lambda::action<3, Act>, Args>::call(A&, B&, C&, Env&) const [with RET = void, A = const boost::tuples::null_type, B = const boost::tuples::null_type, C = const boost::tuples::null_type, Env = const boost::tuples::null_type, Act = boost::lambda::function_action<3, boost::lambda::detail::unspecified>, Args = boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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>]' /usr/include/boost/lambda/detail/select_functions.hpp:61: instantiated from 'static RET boost::lambda::detail::r_select<RET>::go(const boost::lambda::lambda_functor<Arg>&, A&, B&, C&, Env&) [with Arg = boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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 boost::tuples::null_type, B = const boost::tuples::null_type, C = const boost::tuples::null_type, Env = const boost::tuples::null_type, RET = void]' /usr/include/boost/lambda/detail/lambda_functor_base.hpp:408: instantiated from 'RET boost::lambda::lambda_functor_base<boost::lambda::action<2, Act>, Args>::call(A&, B&, C&, Env&) const [with RET = boost::tuples::null_type, A = const boost::tuples::null_type, B = const boost::tuples::null_type, C = const boost::tuples::null_type, Env = const boost::tuples::null_type, Act = boost::lambda::function_action<2, boost::lambda::detail::unspecified>, Args = boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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>]' /usr/include/boost/lambda/detail/lambda_functors.hpp:140: instantiated from 'typename T::sig<boost::tuples::null_type>::type boost::lambda::lambda_functor<Base>::operator()() const [with T = boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> >]' /usr/include/boost/function/function_template.hpp:136: instantiated from 'static void boost::detail::function::void_function_obj_invoker0<FunctionObj, R>::invoke(boost::detail::function::any_pointer) [with FunctionObj = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void]' /usr/include/boost/function/function_template.hpp:479: instantiated from 'void boost::function0<R, Allocator>::assign_to(FunctionObj, boost::detail::function::function_obj_tag) [with FunctionObj = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:430: instantiated from 'void boost::function0<R, Allocator>::assign_to(Functor) [with Functor = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:294: instantiated from 'boost::function0<R, Allocator>::function0(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:637: instantiated from 'boost::function<R ()(), Allocator>::function(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (Test::* const)(int), const Test, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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> > >, const int, 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> > >, R = void, Allocator = std::allocator<void>]' lambda3.cc:27: instantiated from here /usr/include/boost/lambda/detail/actions.hpp:96: error: no matching function for call to 'boost::lambda::function_adaptor<void (Test::*)(int)>::apply(void (Test::* const&)(int), const Test&, const boost::tuples::null_type&)' /usr/include/boost/lambda/detail/function_adaptors.hpp:245: note: candidates are: static Result boost::lambda::function_adaptor<Result (Object::*)(Arg1)>::apply(Result (Object::*)(Arg1), Object*, A1&) [with RET = void, A1 = const boost::tuples::null_type, Object = Test, Arg1 = int, Result = void] /usr/include/boost/lambda/detail/function_adaptors.hpp:249: note: static Result boost::lambda::function_adaptor<Result (Object::*)(Arg1)>::apply(Result (Object::*)(Arg1), Object&, A1&) [with RET = void, A1 = const boost::tuples::null_type, Object = Test, Arg1 = int, Result = void] /usr/include/boost/lambda/detail/actions.hpp:96: error: return-statement with a value, in function returning 'void'

2 5

thread library
by Robert Hanson 24 Jan '06

24 Jan '06

I'm looking at porting a windows (win32) app to linux. Is there a good reason to consider the boost thread library over the linux thread library? Does boost provide a wrapper for threads, so that I won't need to change my source code when porting between the two?

7 13

How to reduce the boost library size
by Jianhong Wang 24 Jan '06

24 Jan '06

Hi I compiled version 1.33.1 under a Windows XP machine with MingW (gcc 3.4.2). The compiling is very smoothing. However the size of directory "boost" is around 1.27 GB. I believe there is some command to clean the building lib, but I could not find it. Any suggestion? thanks!

2 1

Tokenizer usage, combining escaped_list_ and char_?
by Jeremy Tudisco 24 Jan '06

24 Jan '06

I'm attempting to process a scripting language from a file through tokenizer (only recently found out about Spirit, more on that later), and am having difficulties, namely, in processing input like this: "[ ExampleRoutine input; switch( input.messageNumber ) { 1: "Number 1"; 2: "Stand. On one foot (and jump around)"; 3: ! a comment to be ignored input.messageNumber = 1; break; } ];" The ending quotes mark the input as a string literal, the internal are part of the file. The problem comes from the fact that I need to process certain separators as tokens, such as braces, parentheses, periods, end lines, etc, but also allow escape characters in the case of the quotes, which should be treated as one returned token. My current method of processing this is: typedef char_separator<char> CharSep; typedef tokenizer<CharSep> CharTokenizer; typedef CharTokenizer::iterator CTokenIter; const CharSep g_RoutineSep(" \t\n,", "\"';[]{}()<>.!"); #define S_QUOTE "\"" ... // meanwhile, inside a function body CharTokenizer tok( getRoutineFromFile(), g_RoutineSep ); CTokenIter curTok( tok.begin() ); for(; ( curTok != tok.end() ) && ( *curTok != S_CBRACKET ); ++curTok ) { string curWord; if( ( *curTok == S_QUOTE ) { for(++curTok; ( *curTok != S_QUOTE ) && ( curTok != tok.end() ); ++curTok) { curWord += *curTok + ' '; // sure, we could check to see if *curTok is a punctation mark, and if so // not include that last space, but a better way must exist! } } else { // assume it's a command word, and process it here } } Of course, this is prone to gross misinterpretation, as "switch( input.messageNumber )" would be handled in each iteration as "switch", "(", "input", ".", "messageNumber", ")". Yet, this same functionality breaks the string literal into unnatural spacings, as the above code would turn it into "Stand . On one foot ( and jump around ) ", which isn't desired. However, as it stands, escape_list_separator doesn't return the separators, it just acts upon them, so all that fancy operator parsing isn't possible out of the box, requiring breaking things like "switch(" and "input.messageNumber" into separate things. Possible, yes, but extra work. So, the question. Could my needs be satisfied by defining my own TokenizerFunction, and if so, is there a simpler/more exhaustive reference besides the page? Or, conversely, is it time to look into Spirit? - Veni, Vidi, Vemaili. I came, I saw, I replied. -- Jeremy Tudisco, circa now.

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Re: [Boost-users] How to reduce the boost library size
by Merrill Cornish 24 Jan '06

24 Jan '06

Jianhong, If you did a simple Boost build without restricting the output, then your Boost output directory will have many variants of each library. For example, you will have static and dynamic libraries; libraries with and without debug information, libraries with and without threading. And, for each of the above, you will have a two copies of the library named with and without the Boost version number (e.g., -1_31_1) as a suffix. If you decided what combination of debug/threading/static/version you want, you can delete the others, or at least move them elsewhere. Merrill

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Re: [Boost-users] boost::serialization stream exception
by Adrian Grigore 24 Jan '06

24 Jan '06

Jeff Flinn Wrote: >Open your streams with 'binary' mode. Thanks, Jeff! And sorry for the obvious blunder :-) Best Regards, -- Adrian Grigore -- Adrian Grigore adrian(a)lobstersoft.com Lobstersoft - Fun Brain-Bending Games For All Ages http://www.lobstersoft.com Member of the Association of Shareware Professionals

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boost thread does not honour BOOST_ALL_DYN_LINK
by Inge Norum 24 Jan '06

24 Jan '06

The boost thread library does not honour the BOOST_ALL_DYN_LINK setting in config/user.hpp. Thread used to be only available as a dynamically linked library in version 1.31, and I see a note about this in the comment for BOOST_ALL_DYN_LINK. I guess that it now ought to honour this general setting, to avoid defaulting to static linkage even when this is defined? Regards, Inge Norum thread/detail/config.hpp: #if defined(BOOST_THREAD_BUILD_DLL) //Build dll #elif defined(BOOST_THREAD_BUILD_LIB) //Build lib #elif defined(BOOST_THREAD_USE_DLL) //Use dll #elif defined(BOOST_THREAD_USE_LIB) //Use lib #else //Use default # if defined(BOOST_HAS_WINTHREADS) # if defined(BOOST_MSVC) || defined(BOOST_INTEL_WIN) //For compilers supporting auto-tss cleanup //with Boost.Threads lib, use Boost.Threads lib # define BOOST_THREAD_USE_LIB # else //For compilers not yet supporting auto-tss cleanup //with Boost.Threads lib, use Boost.Threads dll # define BOOST_THREAD_USE_DLL # endif # else # define BOOST_THREAD_USE_LIB # endif #endif

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Re: [Boost-users] Multi-Index compound key synthesis via MPL
by Joaquín Mª López Muñoz 24 Jan '06

24 Jan '06

[Luke, this message from you shows up at Google Groups frontend, but somehow it hasn't really made it to the users list. Responding to the list in the hope that at least this answer gets properly processed.] Luke Meyers ha escrito: > The indexed_by construct for a multi_index_container can be replaced by > an mpl::vector, so that the list can be synthesized. I would like to > do the same thing with compound_key, to synthesize such a key based on > a list of types. Can I do this? Alas there's no version of composite_key accepting an MPL sequence instead of the direct enumeration of the constituent key extractors. But with a little MPL and preprocessor stuff, however, you can do what you want, see the attached snippet. HTH, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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[Boost][Bind] How to bind template function member
by Marc Viala 24 Jan '06

24 Jan '06

Hi, I would like to know how I can use boost::bind with template function member? To explain my problem, you will find hereafter an example code that demonstrates it. In this code, when we try to bind the function member X::g the compiler failed with tons of error message. Am I doing something wrong? Best regards, Marc Viala mailto:mviala@acticm.com ----------------------------------- Platform: VC++ 7.1 Boost 1.33.1 ----------------------------------- #include <boost/bind.hpp> #include <boost/function.hpp> struct X { template<typename A, typename B> void g(A& a, B& b) { std::cout << a << " " << b << '\n' ; } void f(int& i) { std::cout << i << '\n'; } } ; template<typename A, typename B> void e(A& a, B& b) { std::cout << a << " " << b << '\n' ; } int main(int argc, char* argv[]) { int a = 10, b = 11 ; X x ; boost::function<void (void)> pe = boost::bind(&e<int,int>, a, b) ; // <- OK pe() ; boost::function<void (void)> pg = boost::bind(&X::g<int,int>, &x, a, b) ; // <- Don't compile? pg() ; boost::function<void (void)> pf = boost::bind(&X::f, &x, a) ; // <- OK pf() ; }

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beginners problems linking serialization library
by Michael Shapiro 24 Jan '06

24 Jan '06

I am having problems linking a program using the serialization library. I have made a small program, considerably simpler than the demo.cpp listed at http://www.boost.org/libs/serialization/doc/tutorial.html and I have also tried linking demo.cpp itself. My hpp files are in /home/mshapiro.local/boost/include/boost-1_32/boost/ My libraries are in /home/mshapiro.local/boost/lib/ I have tried linking this code with gcc 3.4.5 on a linux machine using gcc -I/home/mshapiro.local/boost/include/boost-1_32/ \ -L/home/mshapiro.local/boost/lib/ \ -lboost_serialization-gcc \ demo.cpp I have tried many variations on this! (For example, I have tried g++ instead of gcc, I have tried all variations on the serialization library, such as boost_serialization-gcc-d-1_32, etc, I have tried turning off warnings as suggested in the compiler specific issues.) I can compile using the -c flag, but I cannot link it. I get a large number of error messages all of which look much like /tmp/ccuSnkzu.o(.gnu.linkonce.t._ZN5boost7archive18text_oarchive_implINS0_13text_oarchiveEED1Ev+0x51): In function `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()': : undefined reference to `boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::~basic_text_oprimitive()' I can find various references to this exact problem in the newsgroups, but can find no solution to it. Your help would be greatly appreciated. Many thanks in advance, Michael Shapiro

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Re: [Boost-users] [tuple] no easy access to get function
by JOAQUIN LOPEZ MU?Z 23 Jan '06

23 Jan '06

----- Mensaje original ----- De: François Duranleau <duranlef(a)iro.umontreal.ca> Fecha: Domingo, Enero 22, 2006 6:08 am Asunto: Re: [Boost-users] [tuple] no easy access to get function > On Sat, 21 Jan 2006, JOAQUIN LOPEZ MU?Z wrote: > > > ----- Mensaje original ----- > > De: Frank Birbacher <bloodymir.crap(a)gmx.net> > > Fecha: Sábado, Enero 21, 2006 2:29 am > > Asunto: [Boost-users] [tuple] no easy access to get function > > > >> Today I wanted to std::transform a range of tuples into a > sequence of > >> one element. I thought I could just take the address of some > >> tuple::get<N> function. Maybe also specify the Tuple type as > template>> parameter [...] > >> I'd rather want to take the address of boost::tuple::get<N,Tuple>, > >> but the template parameters won't match. > > > > Maybe you forgot the final s in "tuples" when > > writing > > > > boost::tuples::get<N,Tuple> > > There is a thin wrapper declared in the boost namespace as well. > The > probleme is elsewhere. The argument to the get function is not a > boost::tuple<>, but some base class template. Thus the template > arguments > of the function are not and an integer and a tuple, but an integer > and > something else (actually, a cons<HT,TT> if you look in the code). > To take > the address of such a function, you need to bind the integer, as > well as > HT and TT, not a tuple. Yep, I see. You're right. Well, you can refer to get<> as follows boost::tuples::get<N,typename Tuple::inherited> Note that this is not relying on undocumented implementation, so called "const lists" are explained and made public at http://boost.org/libs/tuple/doc/tuple_advanced_interface.html So I'd say you can use the former reference to get safely. > > However, I am wondering if there would be a problem to declare the > thin > wrapper simply like this (example with the const version): > > template< int N , > typename Tuple > > inline > typename tuples::access_traits< > typename tuples::element< N , Tuples >::type > >::const_type > get( const Tuple& t ) > { > return tuples::get< N >( c ) ; > } > > ? That would also work, but my proposal above is simpler. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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BUG: example boost_file_dependencies.cpp does not compile.
by Robert McCullough 23 Jan '06

23 Jan '06

Hi, I have tried to compile the example boost_file_dependencies.cpp using version 1.33.1 under Linux (gcc) and Windows XP (VC 7.1) and get the same errors. It does not like the following call to dijkstra_shortest_paths_no_init(). If I commit this function out it compiles fine. Any ideas on how to fix this? // Run best-first-search from each vertex with zero in-degree. for (tie(i, iend) = vertices(g); i != iend; ++i) { if (in_degree[*i] == 0) { std::vector<graph_traits<Graph>::vertex_descriptor> pred(num_vertices(g)); property_map<Graph, vertex_index_t>::type indexmap = get(vertex_index, g); dijkstra_shortest_paths_no_init (g, *i, &pred[0], &time[0], weight, indexmap, compare, combine, 0, // Since we are using > instead of >, we (std::numeric_limits<int>::max)(), // flip 0 and inf. default_dijkstra_visitor()); } } List of some of the output. Compiling... boost_file_dependencies.cpp c:\Boost\include\boost-1_33_1\boost\property_map.hpp(25) : error C2039: 'key_type' : is not a member of 'boost::dijkstra_visitor<>' c:\Boost\include\boost-1_33_1\boost\graph\breadth_first_search.hpp(61) : see reference to class template instantiation 'boost::property_traits<PA>' being compiled with [ PA=boost::dijkstra_visitor<> ] c:\Boost\include\boost-1_33_1\boost\graph\dijkstra_shortest_paths.hpp(207) : see reference to function template instantiation 'void boost::breadth_first_visit<VertexListGraph,MutableQueue,boost::detail::dijks tra_bfs_visitor<UniformCostVisitor,UpdatableQueue,WeightMap,PredecessorMap,D istanceMap,BinaryFunction,BinaryPredicate>,ColorMap>(const IncidenceGraph &,boost::graph_traits<G>::vertex_descriptor,Buffer &,BFSVisitor,ColorMap)' being compiled with [ VertexListGraph=Graph, UniformCostVisitor=std::numeric_limits<int>::_Ty, UpdatableQueue=MutableQueue, WeightMap=boost::property_map<Graph,boost::edge_weight_t>::type, PredecessorMap=__w64 unsigned int *__w64 , DistanceMap=int *__w64 , BinaryFunction=boost::closed_plus<int>, BinaryPredicate=std::greater<int>, ColorMap=boost::dijkstra_visitor<>, IncidenceGraph=Graph, G=Graph, Buffer=MutableQueue, BFSVisitor=boost::detail::dijkstra_bfs_visitor<std::numeric_limits<int>::_Ty ,MutableQueue,boost::property_map<Graph,boost::edge_weight_t>::type,__w64 unsigned int *__w64 ,int *__w64 ,boost::closed_plus<int>,std::greater<int>> ] c:\Visual Studio Projects\boost_file_dependencies\boost_file_dependencies\boost_file_dependen cies.cpp(178) : see reference to function template instantiation 'void boost::dijkstra_shortest_paths_no_init<Graph,std::numeric_limits<int>::_Ty,s td::allocator<_Ty>::value_type*__w64 ,std::allocator<int>::value_type*__w64 ,boost::property_map<Graph,Property>::type,boost::property_map<Graph,boost:: vertex_index_t>::type,std::greater<int>,boost::closed_plus<T>,int,boost::dij kstra_visitor<>>(const VertexListGraph &,boost::graph_traits<G>::vertex_descriptor,PredecessorMap,DistanceMap,Weigh tMap,IndexMap,Compare,Combine,DistZero,DijkstraVisitor,ColorMap)' being compiled with [ _Ty=Vertex, Graph=Graph, Property=boost::edge_weight_t, T=int, VertexListGraph=Graph, G=Graph, PredecessorMap=std::allocator<Vertex>::value_type *__w64 , DistanceMap=std::allocator<int>::value_type *__w64 , WeightMap=boost::property_map<Graph,boost::edge_weight_t>::type, IndexMap=boost::property_map<Graph,boost::vertex_index_t>::type, Compare=std::greater<int>, Combine=boost::closed_plus<int>, DistZero=int, DijkstraVisitor=std::numeric_limits<int>::_Ty, ColorMap=boost::dijkstra_visitor<> ] c:\Boost\include\boost-1_33_1\boost\property_map.hpp(25) : error C2146: syntax error : missing ';' before identifier 'key_type' c:\Boost\include\boost-1_33_1\boost\property_map.hpp(26) : error C2039: 'value_type' : is not a member of 'boost::dijkstra_visitor<>' c:\Boost\include\boost-1_33_1\boost\property_map.hpp(26) : error C2146: syntax error : missing ';' before identifier 'value_type' c:\Boost\include\boost-1_33_1\boost\property_map.hpp(27) : error C2039: 'reference' : is not a member of 'boost::dijkstra_visitor<>' c:\Boost\include\boost-1_33_1\boost\property_map.hpp(27) Best regards, Robert McCullough ------------------------------ Software Engineer Promess Incorporated 11429 E. Grand River Brighton, MI. 48116 Phone: 810-229-9334 Fax: 810-229-8125 Email: rob(a)promessdev.com URL: www.promessinc.com <http://www.promessinc.com/> "Get your facts first and then you can distort them as much as you wish." --- Mark Twain

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trouble building bgl-viz
by VP of Communciations 23 Jan '06

23 Jan '06

I have successfully installed boost with VC express (windows), but am having trouble getting the DOT reader going. I don't seem to have the bgl-viz library. I have followed the directions on the "getting started" page and the read_graphviz page, but I must be doing something wrong, because I am not getting the bgl-viz library. I'm new to boost and C++, so please forgive me if these are elementary questions. How do I build the bgl-viz library? Thanks.

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graph compile error with gcc3.3 when edge container is slist
by Weiqing Guo 23 Jan '06

23 Jan '06

Hi, the attached source code is copied from boost_1_33_0/libs/graph/example/adjacency_list.cpp, I only changed the edge container to be slist, and include <slist.h> I compiled it on linux with AMD opteron 844 processor. gcc2.95.3 works fine, but gcc3.3 doesn't compile. I think the reason is slist is not in std namespace in gcc3.3, and adjacency_list.hpp doesn't handle this correctly for slist. > grep BOOST_STD_EXTENSION_NAMESPACE adjacency_list.hpp adjacency_list.hpp: typedef BOOST_STD_EXTENSION_NAMESPACE::slist<ValueType> type; adjacency_list.hpp: typedef BOOST_STD_EXTENSION_NAMESPACE::hash_set<ValueType> type; adjacency_list.hpp: typedef BOOST_STD_EXTENSION_NAMESPACE::hash_set<ValueType> type; adjacency_list.hpp: struct bind_ { typedef BOOST_STD_EXTENSION_NAMESPACE::hash_set<T, std::less<T> > type; }; adjacency_list.hpp: struct bind_ { typedef BOOST_STD_EXTENSION_NAMESPACE::hash_set<T, std::less<T> > type; }; should slist be handled the same way as hash_set ? thanks weiqing //======================================================================= // Copyright 1997, 1998, 1999, 2000 University of Notre Dame. // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek // // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) //======================================================================= #include <boost/config.hpp> #include <iostream> #include <vector> #include <slist.h> #include <utility> #include <string> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/graph_utility.hpp> #include <boost/property_map.hpp> /* Sample Output graph name: foo 0 --joe--> 1 1 --joe--> 0 --curly--> 2 --dick--> 3 2 --curly--> 1 --tom--> 4 3 --dick--> 1 --harry--> 4 4 --tom--> 2 --harry--> 3 (0,1) (1,2) (1,3) (2,4) (3,4) removing edge (1,3): 0 --joe--> 1 1 --joe--> 0 --curly--> 2 2 --curly--> 1 --tom--> 4 3 --harry--> 4 4 --tom--> 2 --harry--> 3 (0,1) (1,2) (2,4) (3,4) */ struct EdgeProperties { EdgeProperties(const std::string& n) : name(n) { } std::string name; }; struct VertexProperties { std::size_t index; boost::default_color_type color; }; int main(int , char* []) { using namespace boost; using namespace std; typedef adjacency_list<slistS, listS, undirectedS, VertexProperties, EdgeProperties> Graph; const int V = 5; Graph g(V); property_map<Graph, std::size_t VertexProperties::*>::type id = get(&VertexProperties::index, g); property_map<Graph, std::string EdgeProperties::*>::type name = get(&EdgeProperties::name, g); boost::graph_traits<Graph>::vertex_iterator vi, viend; int vnum = 0; for (boost::tie(vi,viend) = vertices(g); vi != viend; ++vi) id[*vi] = vnum++; add_edge(vertex(0, g), vertex(1, g), EdgeProperties("joe"), g); add_edge(vertex(1, g), vertex(2, g), EdgeProperties("curly"), g); add_edge(vertex(1, g), vertex(3, g), EdgeProperties("dick"), g); add_edge(vertex(2, g), vertex(4, g), EdgeProperties("tom"), g); add_edge(vertex(3, g), vertex(4, g), EdgeProperties("harry"), g); graph_traits<Graph>::vertex_iterator i, end; graph_traits<Graph>::out_edge_iterator ei, edge_end; for (boost::tie(i,end) = vertices(g); i != end; ++i) { cout << id[*i] << " "; for (boost::tie(ei,edge_end) = out_edges(*i, g); ei != edge_end; ++ei) cout << " --" << name[*ei] << "--> " << id[target(*ei, g)] << " "; cout << endl; } print_edges(g, id); cout << endl << "removing edge (1,3): " << endl; remove_edge(vertex(1, g), vertex(3, g), g); ei = out_edges(vertex(1, g), g).first; cout << "removing edge (" << id[source(*ei, g)] << "," << id[target(*ei, g)] << ")" << endl; remove_edge(ei, g); for(boost::tie(i,end) = vertices(g); i != end; ++i) { cout << id[*i] << " "; for (boost::tie(ei,edge_end) = out_edges(*i, g); ei != edge_end; ++ei) cout << " --" << name[*ei] << "--> " << id[target(*ei, g)] << " "; cout << endl; } print_edges(g, id); return 0; }

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Signature of files saved by boost::serialization
by Bo Peng 23 Jan '06

23 Jan '06

Dear list, What would be a good way to tell if a file is saved by boost::serialization? I notice that the first several characters of binary_oarchive saved files are "\026 \0 \0 \0 \0 \0 \0 serialization" and are "22 serialization" for text_oarchive saved files. Are they reliable signatures? Many thanks in advance. Bo

2 3

Boost Graph library
by Olga Gerchikov 23 Jan '06

23 Jan '06

Hi, Does anyone know if there is a Java port of Boost Graph library? Thank you.

2 1

Boost Graph: problems using add_edge()
by João Orvalho 23 Jan '06

23 Jan '06

Hi, I am using boost 1.33.1 with Visual C++ 2002 (v 7.0.9466) and Windows XP (no service pack). I was doing some experiments with boost Graph library . When running the program i get the following error on add_edge(): ---------------------------------------------------------------------- An unhandled exception of type 'System.TypeLoadException' occurred in test.exe Additional information: Could not load type std._Ptrit<boost::detail::adj_list_gen<boost::adjacency_list<boost::vecS,boost::vecS,boost::bidirectionalS,boost::no_property,boost::no_property,boost::no_property,boost::listS>,boost::vecS,boost::vecS,boost::bidirectionalS,boost::no_property,boost::no_property,boost::no_property,boost::listS>::config::stored_vertex,int,boost::detail::adj_list_gen<boost::adjacency_list<boost::vecS,boost::vecS,boost::bidirectionalS,boost::no_property,boost::no_property,boost::no_property,boost::listS>,boost::vecS,boost::vecS,boost::bidirectionalS,boost::no_property,boost::no_property,boost::no_property,boost::listS>::config::stored_vertex *,boost::detail::adj_list_gen<boost::adjacency_list<boost::vecS,boost::vecS,boost::bidirectionalS,boost::no_property,boost::no_property,boost::no_property,boost::listS>,boost::vecS,boost::vecS,boost::bidirectionalS,boost::no_property,boost::no_property,boost::no_property,boost::listS>::config::stored_vertex &,boost::detail::adj_list_gen<boost::adjacency_list<boost::vecS,boost::vecS,bo0a748880 from assembly test, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null. ---------------------------------------------------------------------- The program is: ---------------------------------------------------------------------- #include <iostream> // for std::cout #include <utility> // for std::pair #include <algorithm> // for std::for_each #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/dijkstra_shortest_paths.hpp> using namespace boost; int main(int,char*[]) { // create a typedef for the Graph type typedef adjacency_list<vecS, vecS, bidirectionalS> Graph; // Make convenient labels for the vertices enum { A, B, C, D, E, N }; const int num_vertices = N; const char* name = "ABCDE"; // writing out the edges in the graph typedef std::pair<int, int> Edge; Edge edge_array[] = { Edge(A,B), Edge(A,D), Edge(C,A), Edge(D,C), Edge(C,E), Edge(B,D), Edge(D,E) }; const int num_edges = sizeof(edge_array)/sizeof(edge_array[0]); // declare a graph object Graph g(num_vertices); // add the edges to the graph object for (int i = 0; i < num_edges; ++i) { add_edge(edge_array[i].first, edge_array[i].second, g); } //// get the property map for vertex indices typedef property_map<Graph, vertex_index_t>::type IndexMap; IndexMap index = get(vertex_index, g); std::cout << "vertices(g) = "; typedef graph_traits<Graph>::vertex_iterator vertex_iter; std::pair<vertex_iter, vertex_iter> vp; for (vp = vertices(g); vp.first != vp.second; ++vp.first) std::cout << index[*vp.first] << " "; std::cout << std::endl; float finish; std::cin >> finish; return 0; } ---------------------------------------------------------------------- Thanks, João Orvalho

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Weird cross compiling issue
by James Hughes 23 Jan '06

23 Jan '06

Hello all, I am cross compiling Boost to an embedded Linux Arm architecture. I reported a problem a week or so ago with failures in some of the libraries which I was unable to solve, and have a bit more information. One of the issues appears with the serialisation library. Although I am compiling for Arm, the serialisation libs end up as Intel X86 binaries, even though all the other successfully compiled libs are ARM. This then leads to problems elsewhere with libraries that appear to need the serialisation libs. I can only think that there is an issue with the make system to do with serialisation area. Anyone have any comments/thoughts? In addition, when I do a build to a particular directory: bjam "-sGCC_ROOT_DIRECTORY=/opt/montavista/mobilinux/devkit/arm/iwmmxt_le" "-sGCC=iwmmxt_le-gcc" "-sGXX=iwmmxt_le-g++" stage the stage folder is created, in which is a lib folder, in which are all the binaries (including the defective Intel ones). However, I would also expect some header files somewhere - should there also be a h (or header) folder next to lib? If not where are the headers I need to include in my apps using Boost? James Info : Boost 1.33.1. gcc : 3.4.3 (iwmmxt_le-gcc)

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Version Mgmt classes/algorithms
by Rich Johnson 23 Jan '06

23 Jan '06

Today 09:06:47 am Hi folks-- I'm looking for a peer-reviewed solutions for managing versions (dll compatibiity, data formats, etc.). If they exist, they're pretty hard to find. ( FWIW, searches with the terms "version" or "versioning" aren't very helpful :-() To date all I've been able to find are ad hoc discussions on matching a specific version. Ultimately, I _think_ I'm looking for 1) a base class for a version specification 2) a range for version compatibility 3)a mixin class (with compatibility check methods) for objects requiring version compatibility. The two use cases I have in mind are: 1) - an application wishes to verify compatibility of a dlopen()'d module as well as the compatibility of its separately compiled objects. 2) - a decoder wishes to verify compatibility with a data file being decoded. Have there been any discussions on this topic in the boost domain? If so, how would I find it? Any one have ideas where else I could look? Or any useful codewords to search for. Thnx --rich

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