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AIX/g++
by Sohail Somani 15 Feb '06

15 Feb '06

Hi, I don't see any AIX regressions so I'm assuming no one officially tests this. Does anyone have any notes about this platform/compiler combination? Does it work? :) Thanks in advance, Sohail

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bind()ing only some arguments of a member function
by Sean Rhea 14 Feb '06

14 Feb '06

Hello, Can someone please tell me why this doesn't work? #include <boost/bind.hpp> #include <boost/function.hpp> #include <boost/shared_ptr.hpp> using namespace std; using namespace boost; struct MyClass { int i; void foo(int j){ printf("%d, %d\n", i, j); } function<void(int)> bar() { return bind<void>(&MyClass::foo, this); } }; $ g++ -c -g -I/usr/local/include/boost-1_33_1 -I.. foo.cpp /usr/local/include/boost-1_33_1/boost/mem_fn.hpp: In member function 'R& boost::_mfi::dm<R, T>::operator()(T*) const [with R = void () (int), T = MyClass]': /usr/local/include/boost-1_33_1/boost/bind.hpp:229: instantiated from 'void boost::_bi::list1<A1>::operator()(boost::_bi::type<void>, F&, A&, int) [with F = void (MyClass::*)(int), A = boost::_bi::list1<int&>, A1 = boost::_bi::value<MyClass*>]' /usr/local/include/boost-1_33_1/boost/bind/bind_template.hpp:32: instantiated from 'typename boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()(A1&) [with A1 = int, R = void, F = void (MyClass::*)(int), L = boost::_bi::list1<boost::_bi::value<MyClass*> >]' /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 136: instantiated from 'static void boost::detail::function::void_function_obj_invoker1<FunctionObj, R, T0>::invoke(boost::detail::function::any_pointer, T0) [with FunctionObj = boost::_bi::bind_t<void, void (MyClass::*)(int), boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, T0 = int]' /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 479: instantiated from 'void boost::function1<R, T0, Allocator>::assign_to(FunctionObj, boost::detail::function::function_obj_tag) [with FunctionObj = boost::_bi::bind_t<void, void (MyClass::*)(int), boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, T0 = int, Allocator = std::allocator<void>]' /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 430: instantiated from 'void boost::function1<R, T0, Allocator>::assign_to(Functor) [with Functor = boost::_bi::bind_t<void, void (MyClass::*)(int), boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, T0 = int, Allocator = std::allocator<void>]' /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 294: instantiated from 'boost::function1<R, T0, Allocator>::function1(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functo r>::value>::value, int>::type) [with Functor = boost::_bi::bind_t<void, void (MyClass::*)(int), boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, T0 = int, Allocator = std::allocator<void>]' /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 637: instantiated from 'boost::function<R ()(T0), Allocator>::function(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functo r>::value>::value, int>::type) [with Functor = boost::_bi::bind_t<void, void (MyClass::*)(int), boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, T0 = int, Allocator = std::allocator<void>]' foo.cpp:15: instantiated from here /usr/local/include/boost-1_33_1/boost/mem_fn.hpp:347: error: invalid use of non-static member function Thanks, Sean -- Compassion, tolerance, consideration of others, the responsible use of knowledge and power. These principles transcend the barriers between religious believers and non-believers; they belong not to one faith, but to all faiths. -- The 14th Dalai Lama

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Tricky RPC code using bind()
by Sean Rhea 14 Feb '06

14 Feb '06

All, I've written what I thought was a pretty clever RPC server using bind and templated functions to make server callbacks typesafe. It all resolves around this one function: class rpc_server { ... template <class A, class R> void set_handler(int prog, int vers, int proc, bool_t (*arg_fn)(XDR *, A*), bool_t (*res_fn)(XDR *, R*), function<void(A*,function<void(R*)>)> req_cb) { ... } } The idea being that you pass it the program, version, and procedure numbers, pointers to the xdr_ functions that encode/decode the argument and response types, and a function object that takes a pointer to the argument type and a callback to call with the result. It should be really nice to use, as it makes sure your callback handles the same types as the relevant encoding/decoding functions. Currently, however, I can't get it to compile. The error from gcc 4.0.1 on OS X Tiger is: g++ -c -g -I/usr/local/include/boost-1_33_1 -I.. rpc_server.cpp rpc_server.cpp: In member function 'void rpc_server::set_handler(int, int, int, int (*)(XDR*, A*), int (*)(XDR*, R*), boost::function<void ()(A*, boost::function<void ()(R*), std::allocator<void> >), std::allocator<void> >) [with A = example_args, R = example_res]': rpc_server.cpp:277: instantiated from here rpc_server.cpp:171: error: cannot resolve overloaded function 'call_req' based on conversion to type 'int' make: *** [rpc_server.o] Error 1 I've attached rpc_server.cpp. Can anyone tell me why the compiler doesn't have the information it needs? It seems to have figured out what types A and R are. What else does it need to resolve call_req? Thanks for your time, Sean -- When I see the price that you pay / I don't wanna grow up -- Tom Waits

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iostreams library and zlib/bzip2 support
by Robert Vinluan 14 Feb '06

14 Feb '06

Hi All, Right now, in order to compile and link to the iostreams library with zlib/bzip2 support, I have to include the .cpp files in my project (as mentioned in the boost docs). I'm not too fond of this idea as I want to keep 3rd-party code outside of my project build. Perhaps I have missed something in the docs, but is there another way to link with the iostreams library without including the .cpp files? Also along these lines ... is there any reason why zlib.cpp and bzip2.cpp are not compiled into libboost_iostreams-*.lib? Many Thanks, Rob

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Re: [Boost-users] Tree data structure
by Gottlob Frege 14 Feb '06

14 Feb '06

On 2/14/06, boost-users-request(a)lists.boost.org < boost-users-request(a)lists.boost.org> wrote: > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 14 Feb 2006 11:47:42 +0100 > From: Jeroen Vanattenhoven <jeroen.vanattenhoven(a)esat.kuleuven.be> > Subject: [Boost-users] Tree data structure > To: boost-users(a)lists.boost.org > Message-ID: <43F1B54E.1080805(a)esat.kuleuven.be> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Which of the boost libraries do I need for creating a tree data > structure? Purpose is to hold data for a legend for a map. The legend > has different layers and each layer may have sublayers. > > Thanks, > > Jeroen > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm > > > Not part of boost, but you can try the 'forest' type in Adobe's open source library. opensource.adobe.com.

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Solved my problem, RE: program_options wide chars.
by John Gardner 14 Feb '06

14 Feb '06

Apparently the library is compiled treating wchar_t as a built-in type. This applies to at least Visual Studio .Net 2003, and probably 2005. Programs that link with the program_options lib need to define /Zc:wchar_t, e.g. Project Properties -> C/C++ -> Language -> Treat wchar_t as Built-in Type -> Yes --John Gardner

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program options, link error on wide char support
by John Gardner 14 Feb '06

14 Feb '06

I'm having a problem with the wchar_t functions on windows with VS .Net 2003. I compiled with bjam "-sTOOLS=vc-7_1" -sBOOST_LIB_DIAGNOSTIC --without-python install In a program with a _tmain (wchar_t argv), I have: #ifdef BOOST_NO_STD_WSTRING cout << "No standard wstring! " << BOOST_NO_STD_WSTRING << endl; #endif cout << "Stdlib version: " << BOOST_STDLIB << endl; wstring wstr = L"abc"; string str = "abc"; str = boost::program_options::to_internal(wstr); I get: error LNK2019: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl boost::program_options::to_internal(class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > const &)" (?to_internal@program_options@boost@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@4@@Z) referenced in function _main However, if I call to_internal() with 'str' instead of 'wstr', it links fine, and the output is: Stdlib version: Dinkumware standard library version 313 abc I have similar problems with other functions, but I've narrowed it down to a single function here. Is there anything special that needs to happen for wchar_t functions in program_options? TIA, John Huxoll Gardner

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Tree data structure
by Jeroen Vanattenhoven 14 Feb '06

14 Feb '06

Which of the boost libraries do I need for creating a tree data structure? Purpose is to hold data for a legend for a map. The legend has different layers and each layer may have sublayers. Thanks, Jeroen Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

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Re: [Boost-users] BGL : Undirected graph form a directed graph
by Dmitry Bufistov 14 Feb '06

14 Feb '06

boost-users-request(a)lists.boost.org wrote: > > Hello, > > I want to find the (weakly) connected components and the biconnected > components of a directed(bidirectional) graph. > But these methods need a undirected graph as input. Does anyone know a > simple way to create a undirected graph from a directed graph or a > undirected view of a directed graph? > > Thanks a lot, > > Jean-Noël > > > ------------------------------------------------------------------------ > Hi, Probably this could help #include <boost/graph/copy.hpp> boost::copy_graph() if not something like this should work template <class TGraph1, class TGraph2> void directed2undirected(const TGraph1& directed_graph, TGraph2& undirected_graph) { typedef typename boost::graph_traits<TGraph1>::vertex_descriptor vertex1; typedef typename boost::graph_traits<TGraph2>::vertex_descriptor vertex2; typedef typename boost::graph_traits<TGraph1>::edge_iterator edge_iterator; std::vector<vertex1> orig_vertices; std::copy(vertices(directedt_graph).first, vertices(directed_graph).second, std::back_inserter(orig_vertices)); std::map<vertex1, vertex2> vertex_map; // undirected = TGraph2(boost::num_vertices(directed_graph)); for (std::size_t i = 0; i < num_vertices(directed_graph); ++i) { vertex_map[orig_vertices[i]] = boost::add_vertex(undirected_graph); ///Also would be good to copy properties, but it isn't necessary as far as I understand } for (edge_iterator e = edges(directed_graph).first; e != edges(directed_graph).second; ++e) { boost::add_edge(vertex_map[source(*e, directed_graph)], vertex_map[target(*e, directed_graph)], /*directed_graph[*e],*/ undirected_graph); } } I don't know if there is some way to do it without copying. If some, please let me know. Regards, --dmitry

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Boost random hangs
by gast128 14 Feb '06

14 Feb '06

Dear all, probably alread posted a hundred times, but the follwoing code hangs on my pc: int MakeRandomInt() { const int nMin = std::numeric_limits<int>::min(); const int nMax = std::numeric_limits<int>::max(); typedef boost::minstd_rand Generator; typedef boost::uniform_int<> Distributor; typedef boost::variate_generator<boost::minstd_rand, Distributor> VariateGenerator; Generator generator(static_cast<unsigned>(time(NULL))); Distributor uni_dist(nMin, nMax); VariateGenerator uni(generator, uni_dist); return uni(); } Making the range half the size does help. Did I miss the documentation? Wkr, me

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