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

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by raulh39＠ya.com 18 Feb '06

18 Feb '06

Hello Newsgroup, I think that in "libs/tuple/doc/tuple_advanced_interface.html" there is a mistake: "The template access_traits defines three type functions. Let T be a type of an element in a tuple: 1. access_traits<T>::type maps T to the return type ... " There is no such member "::type". ¿Maybe it is "::non_const_type"? Best regards, Raúl.

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Many error when building Boost libraries
by Rob Marsden 18 Feb '06

18 Feb '06

I see many compilation problems here in the list, so I hope you will forgive me adding to the clutter. Can someone tell me what I'm doing wrong or missing to get the following. When building Boost 1.33.0, the date_time, program_options and wave libraries fail to build. I am after the program_options in particular. My environment is intel_win32 running in the MSVC v6 IDE. The output from the build runs to 176Kb, but of the very many errors, the typical ones are: C:\Libraries\boost_1_33_0\libs\program_options\build\../src/options_description.cpp(378): error: too few arguments for class template "std::reverse_iterator" find(reverse_iterator<string::const_iterator>(line_end - 1), C:\Libraries\boost_1_33_0\libs\program_options\build\../src/variables_map.cpp(81): error: no instance of overloaded function "std::set<_K, _Pr, _A>::insert [with _K=std::string, _Pr=std::less<std::string>, _A=std::allocator<std::string>]" matches the argument list argument types are: (std::set<std::string, std::less<std::string>, std::allocator<std::string>>::iterator, std::set<std::string, std::less<std::string>, std::allocator<std::string>>::iterator) object type is: std::set<std::string, std::less<std::string>, std::allocator<std::string>> xm.m_final.insert(new_final.begin(), new_final.end()); ^ These recur many times in the program_option builds, plus things like: C:\Libraries\boost_1_33_0/boost/lexical_cast.hpp(156): error: no operator ">>" matches these operands operand types are: std::basic_stringstream<char, std::char_traits<char>, std::allocator<char>> >> boost::date_time::date_names_put<boost::gregorian::greg_facet_config, wchar_t, std::ostreambuf_iterator<wchar_t, std::char_traits<wchar_t>>>::string_type stream >> output && ^ detected during: instantiation of "bool={bool} boost::detail::lexical_stream<Target, Source>::operator>>(InputStreamable &) [with Target=boost::date_time::date_names_put<boost::gregorian::greg_facet_config, wchar_t={unsigned short}, std::ostreambuf_iterator<wchar_t={unsigned short}, std::char_traits<wchar_t={unsigned short}>>>::string_type, Source=boost::detail::array_to_pointer_decay<const wchar_t={unsigned short} *>::type={const wchar_t={unsigned short} *}, ... and so on to ... instantiation of "boost::date_time::all_date_names_put<Config, charT, OutputIterator>::all_date_names_put(const charT *const *, const charT *const *, const charT *const *, const charT *const *, const charT *const *, charT, boost::date_time::ymd_order_spec, boost::date_time::month_format_spec) [with Config=boost::gregorian::greg_facet_config, charT=wchar_t={unsigned short}, OutputIterator=std::ostreambuf_iterator<wchar_t={unsigned short}, std::char_traits<wchar_t={unsigned short}>>]" -- Rob Marsden Gistix (Northern) Limited

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How to store the result of boost::bind?
by David Williams 18 Feb '06

18 Feb '06

Hi, if I call boost::bind it creates a function object, is that correct? So how can I give this function object a name? That is, presumably I can have an expression like: SomeTypeHere myFunc = boost::bind(...); But what should SomeTypeHere actually be? I've found I can use boost::function but would rather not for performance reasons. Any other options? Thanks, David

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Un-nesting a class
by Perry Smith 18 Feb '06

18 Feb '06

I have a template like: template <typename Z> class foo { // ... I know that Z has the form A::B::C (three levels of nesting). Does boost have a way for me to define a type which refers to A::B? Thanks, Perry

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Re: [Boost-users] Un-nesting a class
by Sohail Somani 17 Feb '06

17 Feb '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Perry Smith > Sent: Friday, February 17, 2006 11:24 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] Un-nesting a class > > I have a template like: > > template <typename Z> > class foo { // ... > > I know that Z has the form A::B::C (three levels of nesting). Does > boost have a way for me to define a type which refers to A::B? typedef ab A::B; ?

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Re: [Boost-users] Un-nesting a class
by Sohail Somani 17 Feb '06

17 Feb '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Perry Smith > Sent: Friday, February 17, 2006 11:24 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] Un-nesting a class > > I have a template like: > > template <typename Z> > class foo { // ... > > I know that Z has the form A::B::C (three levels of nesting). Does > boost have a way for me to define a type which refers to A::B? Oops. I think I meant: template<typename Z> class foo { typedef typename Z::B zb; }; class A { class B { }; }; foo<A> a;

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[tuple, lambda] predicate does not compile
by Christian Rössel 17 Feb '06

17 Feb '06

Hello Newsgroup, in the following code the call bind (&boost::tuple<int, double>::get<0>, _1) does not compile whereas an analogous call with a non-template parameter compiles fine. What am I doing wrong? I'm using boost 1.33.1 and Visual Studio 7.1 Thanks in advance, Christian #include <vector> #include <algorithm> #include <string> #include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> #include <boost/tuple/tuple.hpp> class SearchForMe { std::string a_; public: std::string getA () {return a_;} }; int main(int argc, char* argv[]) { using namespace std; using namespace boost::lambda; vector<SearchForMe> foo; // compiles fine find_if (foo.begin (), foo.end (), bind (&SearchForMe::getA, _1) == "apple"); vector< boost::tuple<int, double> > bar; // does not compile find_if (bar.begin (), bar.end (), bind (&boost::tuple<int, double>::get<0>, _1) == 15); return 0; } The error messages are: Compiling... boost_lambda.cpp d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::bind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(232) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::bind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(232) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<Arity,Act>,detail::bind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' with [ Arity=2, Act=boost::lambda::function_action<2> ] d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(212) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<Arity,Act>,detail::bind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' with [ Arity=2, Act=boost::lambda::function_action<2> ] d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(212) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<Arity,Act>,detail::bind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' with [ Arity=2, Act=boost::lambda::function_action<2> ] d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(212) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::bind_tuple_mapper<Result(__cdecl &)(Par1),const Arg2>::type>> boost::lambda::bind(Result (__cdecl &)(Par1),const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(190) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::bind_tuple_mapper<Result(__cdecl &)(Par1),const Arg2>::type>> boost::lambda::bind(Result (__cdecl &)(Par1),const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(190) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::bind_tuple_mapper<Result(__cdecl &)(Par1),const Arg2>::type>> boost::lambda::bind(Result (__cdecl &)(Par1),const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(190) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2780: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<1,boost::lambda::function_action<1,Result>>,detail::bind_tuple_mapper<const Arg1>::type>> boost::lambda::bind(const Arg1 &)' : expects 1 arguments - 2 provided d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(91) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2780: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<Arity,Act>,detail::bind_tuple_mapper<const Arg1>::type>> boost::lambda::bind(const Arg1 &)' : expects 1 arguments - 2 provided with [ Arity=1, Act=boost::lambda::function_action<1> ] d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(71) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda\boost_lambda.cpp(31) : error C2780: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<1,boost::lambda::function_action<1,Result>>,detail::bind_tuple_mapper<Result(__cdecl &)(void)>::type>> boost::lambda::bind(Result (__cdecl &)(void))' : expects 1 arguments - 2 provided d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(49) : see declaration of 'boost::lambda::bind'

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[Review] Shmem library review results
by Fred Bertsch 17 Feb '06

17 Feb '06

Hello everyone, The formal review of Ion Gaztañaga's Shmem library ended yesterday. I am pleased to announce that it was accepted into Boost! This library clearly generated a lot of interest from people since we got quite a few reviews. All of them were positive. During the discussion, some weaknesses in the library were found, and Ion has agreed to correct them. These include: - Improvements to the documentation and example code. - Clearer documentation on which header files to include for which objects. - Removing the 2-phase construction mechanism and replacing them with RAII-only constructors. - Adding !is_polymorphic static asserts when inserting an object into shared memory. Several difficult issues were raised during the review that will not be solved immediately. These include: - Security information about the shared memory object is currently avoided. - The synchronization objects have some weaknesses. Some of these weaknesses are related to the same weaknesses in Boost.Threads. - Memory mapped file regions are not separate from memory mapped files in the current implementation. - Multi-segment shared memory that would allow the shared memory object to grow. Perhaps these issues could be dealt with in a future version. Thank you, everyone, for the reviews and discussions about Shmem. This library should be extremely useful to those doing IPC. -Fred Bertsch

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Re: [Boost-users] [serialization] Really strange error that crashes the application
by Scott 17 Feb '06

17 Feb '06

> My guess is that the DLL is getting unloaded "too soon". You > might put a break point in the unload code of the DLL and see > if that trips before the assertion. There have been problems > with code explictly unloaded while the type is still "in use" > in a non-obvious way. > > Robert Ramey I'm really at a loss as to why this is happening. Here's the call stack: NwNetworkD.dll!_onexit(int (void)* func=0x0012fa94) Line 81 + 0x2e C ffffffff() boost_serialization-vc71-mt-gd-1_33_1.dll!0032aa2e() NwNetworkD.dll!boost::archive::detail::interface_oarchive<boost::archive::te xt_oarchive>::operator<<<nw::Manager::ManagerNode const >(const nw::Manager::ManagerNode & t={...}) Line 78 + 0x4a C++ NwNetworkD.dll!nw::Manager::save(const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & filename={...}) Line 236 C++ After calling my method "save", it walks a map and serializes my ManagerNode classes. As you can see from the call stack, it then enters a function in the serialization DLL. >From there, something goes horribly wrong. What is ffffffff()? It seems like a bad pointer is getting dereferenced or something. Then the very next action is NwNetworkD.dll!_onexit(). I can tell you that our code is NOT unloading that DLL. At the current time, our code is single threaded and the DLL in question is not actually dynamically loaded/unloaded ever. It's statically loaded by the runtime on application start (we just link against the .lib for that DLL). Scott

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[BGL]johnson_all_pairs_shortest_path algorithm doesn't use distance_inf named parameter.
by Peter Gerell 17 Feb '06

17 Feb '06

Hi, I am had sime difficulties using the johnson_all_pairs_shortest_path algorithm. I have a custom weight type called CostType. I tried calling the algorithm as follows. johnson_all_pairs_shortest_paths(g, D, distance_inf(CostType::infinity())); The result was a distance matrix with all zeros. The problem is the following lines from johnson_all_pairs_shortest_path.hpp DT inf = (std::numeric_limits<DT>::max)(); for (tie(v, v_end) = vertices(g2); v != v_end; ++v) d[*v] = inf; If I specialized the numerical-limits class for CostType everything started to work as expected. namespace std { template<> class numeric_limits<CostType> { public: inline static CostType min() throw() { return -CostType::infinity();} inline static CostType max() throw() { return CostType::infinity(); } }; } Even if this is the good way to solve the problem, it doesn't work for what I want to do. I'm trying to calculate the longest paths by redefining distance_inf and distance_compare. Is this a bug or is it something I don't understand? I am using boost 1.33.1 /Peter

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