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documentation available for forthcoming boost:fsm?
by Oliver.Kowalke＠infineon.com 13 Dec '05

13 Dec '05

Hello, where can I find the documentation fort he forthcoming fsm library? http://boost-sandbox.sf.net/Statechart.zip contains no docu Best Regards, Oliver

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[mpl] remove duplicates in (non-integral) type sequences
by Karl Friedrich Walkow 13 Dec '05

13 Dec '05

i try to find a solution for eliminating all duplicates of types in a non-integral sequence. the only extisting solution i found has a set< > as output, but i want to keep the sequence type. the following code _should_ solve the problem, but there seems to be something wrong with it. if someone has an idea... #include <boost/mpl/assert.hpp> #include <boost/mpl/vector.hpp> #include <boost/mpl/fold.hpp> #include <boost/mpl/empty_sequence.hpp> #include <boost/mpl/contains.hpp> #include <boost/mpl/if.hpp> #include <boost/mpl/joint_view.hpp> #include <boost/mpl/single_view.hpp> #include <boost/mpl/size.hpp> using namespace boost::mpl; struct E {}; struct F {}; struct G {}; struct H {}; int main(int argc, char* argv[]) { typedef vector< E, E, F, E, G, H, G, G, F, G >::type with_duplicates; typedef fold< with_duplicates, empty_sequence, if_< contains< _1, _2 >::type, _1, joint_view< _1, single_view< _2 >::type >::type >::type >::type without_duplicates; BOOST_MPL_ASSERT_RELATION(size<with_duplicates>::value, ==, 10); BOOST_MPL_ASSERT_RELATION(size<without_duplicates>::value, ==, 4); return 0; } much thanks in advance, karl

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Re: [Boost-users] serialization: loading std::map replaces existing mapdata objects
by Peter Whaite 13 Dec '05

13 Dec '05

Robert Ramey <ramey(a)rrsd.com> wrote: > the copy_collection was an experiment on work has been suspended and > probably not be implemented, and if it were implemented, would be > implemented differently in anycase. Ok. Thanks. > b) Just specify a serialize function for the particular map you are > using. > e.g. > > template<class Archive> > void serialize(Archive & ar, std::map<my_class> > & t, const unsigned int > version){ > // for each member in the map > ar & *it; > } > > I believe that b) would be a good solution for you. Yes thats ok, but I was serializing more than one map in the same class and I wanted to maintain the separation in xml. I guess I'd have to derive my own map I lazily trying to avoid that. > You post clarifies one point in particular. My version implements the > most commonly desired behavior - but not the only behavior people > might want. In other words - there is not always agreeement on what > it means to "restore" something. And in fact the serialization > implementation uses both and some time its confusing. Yes I agree, though in my case, now I know the limitation, its not difficult to refactor. I do find the refactoring (conditionally initialize after a load) a little forced however. Thanks again for the response. -- Peter Whaite.

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[serialization] Removing objects from an archive
by Przemyslaw Wojnowski 13 Dec '05

13 Dec '05

Hello. How can one remove information about object from existing archive? Do archives implement removing? I haven't seen removing from an archive in any archive interface description. Thanks for any help. Regards, Przemek

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[Graph] dijkstra_shortest_paths color map
by Daniel Mitchell 12 Dec '05

12 Dec '05

I work with very large implicit graphs that use out-of-core storage for properties, including the vertex color property, but the following bit of code in dijkstra_shortest_paths_no_init (boost-1.33.0) seems to preclude the use of a custom color map. std::vector<default_color_type> color(num_vertices(g)); default_color_type c = white_color; breadth_first_visit(g, s, Q, bfs_vis, make_iterator_property_map(&color[0], index_map, c)); What is the rationale for the above code, and how should I work around it? Daniel

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BGL dijksra_shortest_path and boost::on_initialize_vertex
by Andreas Fabri 12 Dec '05

12 Dec '05

Hello, I have my own graph model and want to run dikstra_shortest_path on it. I want a dijkstra_visitor to initialize the id's of my vertices, struct initialize_index : public boost::base_visitor<initialize_index> { int i; typedef boost::on_initialize_vertex event_filter; initialize_index(int i_) : i(i_) {} template <class Vertex, class Graph> void operator()(Vertex v, Graph& G) { std::cout << "i = " << i << std::endl; v->id() = i++; } }; . . . . boost::dijkstra_shortest_paths(ft, source , distance_map(distance_pmap) .predecessor_map(predecessor_pmap) .visitor(make_dijkstra_visitor(initialize_index(0)))); but the operator is never called. Is that a bug ? Shouldbn't it be called by the bfs performed in dijkstra_shortest_paths_no_init ? Also when looking in the header file dijkstra_shortest_paths.hpp I see that the color map gets initialized before the vertices get initialized. I would expect that the vertices get initialized before the color map gets initialized, because if the vertex_index_map is not set up correctly ... andreas

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[bjam][mingw] signals fails to build + solution
by Paul 12 Dec '05

12 Dec '05

Hi all, I had a problem with boost 1.33.1, building it on windows XP inside the msys (MinGW) environment. The link step generates this command: "g++" "-Wl,--enable-auto-image-base" "-Wl,--exclude-symbols,_bss_end__:_bss_start__:_data_end__:_data_start__" "-Wl,--out-implib,..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\debug\boost_signals-mgw-d-1_33_1.lib" -g -shared -Wl,--allow-multiple-definition -mno-cygwin -o "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\debug\boost_signals-mgw-d-1_33_1.dll" -L"" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\debug\trackable.obj" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\debug\connection.obj" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\debug\named_slot_map.obj" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\debug\signal_base.obj" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\debug\slot.obj" and it fails, giving a message about not being able to find a symbol for a method in trackable. I edited tools/build/v1/mingw-tools.jam and added this line: flags mingw STDLIBPATH : $(GCC_BIN_DIRECTORY) ; + flags mingw LIBPATH : $(GCC_BIN_DIRECTORY) ; } And tried again. This time it worked, with the following command: "g++" "-Wl,--enable-auto-image-base" "-Wl,--exclude-symbols,_bss_end__:_bss_start__:_data_end__:_data_start__" "-Wl,--out-implib,..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\release\boost_signals-mgw-1_33_1.lib" -s -shared -Wl,--allow-multiple-definition -mno-cygwin -o "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\release\boost_signals-mgw-1_33_1.dll" -L"" -L"" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\release\trackable.obj" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\release\connection.obj" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\release\named_slot_map.obj" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\release\signal_base.obj" "..\..\..\bin\boost\libs\signals\build\boost_signals.dll\mingw\release\slot.obj" The difference is that there is an EXTRA -L"" in the command. I suspect that having any -L"" is a bad idea, and if there is no parameter, it should be omitted all together. I bet this command works ONLY because, to g++, it looks like g++ blah blah -L"-L" ie the second -L becomes the parameter for the first -L (spaces are allowed after the -L flag). I dont understand bjam's Jamfiles well enough to fix this properly. Can someone help put together a patch for this? Thanks Paul

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Boost::graph Create external property map for storing edges color
by Dmitriy Bufistov 12 Dec '05

12 Dec '05

Hello everybody, I have desperated to find solution to my, I believe, simple problem which is in the following: construct "external" property map for storing edges color, this map should be suitable for such usage: boost::dynamic_properties p; p.property("color", MY_MAP); because I would like to write this property to ".dot" file using write_viz() function. Many thanks in advance for any help, Regards, --Dmitry

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Re: [Boost-users] Wave: how to recover after errors?
by Hartmut Kaiser 12 Dec '05

12 Dec '05

> Max Motovilov wrote: > > > Yet something fishy happens > > with the state I can't quite put my finger on. Here's my example > > input: > > > > ============= > > #define Foo(x) bar##x > > Foo(foo1) > > #define Foo(x) x##bar > > #define Bar(x) x##foo > > Foo(foo2) > > Bar(bar1) > > > > ============= > > [snip] > > Yes, I'll have to look into this. My current implementation > was a first shot and Ive expected to get problems. Wave is > not written for error recovery, I'll have to invest some time > to insert reliable synchronisation points. That's fixed now in CVS. Regards Hartmut

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Problem with filter and stream array_source
by Rodrigo Baroni 11 Dec '05

11 Dec '05

Hi all. I'm having a problem trying to compress a buffer in memory using the boost filters and streams. The code is in : http://baroni.homelinux.org:8008/~baroni/bugs/test_compress_buffer.html Please, any comments is welcome. The problem seems to be a famous one, but I could not find the solution. Thanks in advance, Rodrigo F. Baroni

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