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[statechart] - error with templated states (no type 'inner_contex_type')
by Oliver.Kowalke＠infineon.com 10 Mar '06

10 Mar '06

Hello, I get another error if I use templated states (gcc-3.4.6). 'simple_state.hpp:403: error: no type named inner_context_type in struct proto<int>' Instantiation of state_machine:: initiate() causes the error. with regards, Oliver #include <iostream> #include <stdexcept> #include <boost/statechart/simple_state.hpp> #include <boost/statechart/state_machine.hpp> namespace sc = boost::statechart; template< typename S > struct proto; template< typename S > struct sm : public sc::state_machine< sm< S >, proto< S > > {}; template< typename S > struct inactive; template< typename S > struct proto : public sc::simple_state< proto< S >, sm< S >, inactive< S > > {}; template< typename S > struct inactive : public sc::simple_state< inactive< S >, proto< S > > {}; int main() { try { sm< int > fsm; fsm.initiate(); // <<== causes compiler error return 0; } catch ( std::runtime_error const& e) { std::cerr << e.what() << std::endl; } catch (...) { std::cerr << "unhandled exception" << std::endl; } return -1; }

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[optional] swapping initialized with uninitialized
by Vaclav Vesely 10 Mar '06

10 Mar '06

Hi, When two optionals (one initialized and other not) are swaped, then the one value in uninitialized optional is constructed and the other one in initialized optional is destructed. IMHO it's not necessary. It should be more effective to swap optional's m_storages without any values constructiona and destruction. Is there any reason for the current implementation? Regards, Vaclav

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in_place_factory0
by Vaclav Vesely 10 Mar '06

10 Mar '06

Hi, is there any reason for missing in_place_factory without arguments? I would like to write optional<my_class> mc(in_place()); I've wrote the code for this. But I can't modify the macro hell in "in_place_factory.hpp". Regards, Vaclav class in_place_factory0: public in_place_factory_base { public: in_place_factory0() {} template<class T> void apply(void* address) const { new(address) T(); } }; in_place_factory0 in_place() { return in_place_factory0(); }

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Monads in boost.mpl?
by Korcan Hussein 10 Mar '06

10 Mar '06

I'm just wondering if there is any specific reason why monadic programming hasn't been explored in pre-processor/template metaprogramming other than (probably) the most obvious reasons. I can see a state monad being probably quite useful. I'm just refreshing my memory on monadic programming in Haskell just to see if this is applicable to problem I'm currently having.

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[Boost.Test] range support
by jth01＠arcor.de 10 Mar '06

10 Mar '06

Hello, what do people think about Boost.Range support? Instead of writing my_range_type r = <complex expression>; std::vector< int > v = list_of(1)(2)(3); BOOST_CHECK_EQUAL_COLLECTIONS(r.begin(), r.end(), v.begin(), v.end()); one could write more conveniently the single line BOOST_CHECK_EQUAL_RANGES( <complex expression>, list_of(1)(2)(3) ); It's also more readable and would so improve the documentational aspect of tests. (Is it ok to post short diffs as this?) Index: boost/test/test_tools.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/test/test_tools.hpp,v retrieving revision 1.59 diff -u -r1.59 test_tools.hpp --- boost/test/test_tools.hpp 3 Mar 2006 17:39:46 -0000 1.59 +++ boost/test/test_tools.hpp 6 Mar 2006 19:50:52 -0000 @@ -33,6 +33,7 @@ #include <boost/preprocessor/repetition/repeat.hpp> #include <boost/preprocessor/punctuation/comma_if.hpp> #include <boost/preprocessor/arithmetic/add.hpp> +#include <boost/range/functions.hpp> #include <boost/limits.hpp> #include <boost/type_traits/is_array.hpp> @@ -222,6 +223,22 @@ //____________________________________________________________________________// +#define BOOST_EQUAL_RANGES_IMPL( L, R, TL ) \ + BOOST_TEST_TOOL_IMPL( check_impl, ::boost::test_tools::tt_detail::equal_range_impl( \ + (L), (R) ), "", TL, CHECK_EQUAL_COLL ), \ + 2, \ + BOOST_STRINGIZE( L ), BOOST_STRINGIZE( R ) ) \ +/**/ + +#define BOOST_WARN_EQUAL_RANGES( L, R ) \ + BOOST_EQUAL_RANGES_IMPL( L, R, WARN ) +#define BOOST_CHECK_EQUAL_RANGES( L, R ) \ + BOOST_EQUAL_RANGES_IMPL( L, R, CHECK ) +#define BOOST_REQUIRE_EQUAL_RANGES( L, R ) \ + BOOST_EQUAL_RANGES_IMPL( L, R, REQUIRE ) + +//____________________________________________________________________________// + #define BOOST_BITWISE_EQUAL_IMPL( L, R, TL ) \ BOOST_TEST_TOOL_IMPL( check_impl, \ ::boost::test_tools::tt_detail::bitwise_equal_impl( (L), (R) ), \ @@ -547,6 +564,16 @@ //____________________________________________________________________________// +template <typename Left, typename Right> +inline predicate_result +equal_range_impl( Left const& left, Right const& right ) +{ + return equal_coll_impl( boost::begin(left), boost::end(left), + boost::begin(right), boost::end(right) ); +} + +//____________________________________________________________________________// + template <class Left, class Right> inline predicate_result bitwise_equal_impl( Left const& left, Right const& right )

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[optional] swap initialized with uninitialized
by Vaclav Vesely 10 Mar '06

10 Mar '06

Hi, When two optionals are swaped and only one is initialized, then wrapped value in the uninitialized optional is constructed and that in initialized one is destroyed. It's maybe not necessary. It should be sufficient and more effective to swap optional_base's member (m_initialized and m_storage). Is there any reason for this implementation? Regards, Vaclav

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[assign] ptr_map_inserter
by Vladimir Prus 10 Mar '06

10 Mar '06

Hi, the above test fails on a large number of compilers, with what looks like a legitimate compile error. For example, see: http://tinyurl.com/j3tg5 Can somebody look into this? Thanks, Volodya

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[serialization] nvp.hpp include order problem
by Kim Barrett 10 Mar '06

10 Mar '06

In boost 1.33.1, using gcc 3.3.5 (SuSE9.3 on x86 if it matters) I've run into an include order problem with the serialization library. It seems that including <boost/serialization/nvp.hpp> before including <boost/archive/polymorphic_iarchive.hpp> (or oarchive) doesn't work. In a translation unit that does this and includes an invocation of serialization, I get an error of the form: .../iserializer.hpp: In constructor `...iserializer<Archive, T>::iserializer() [with ARchive = polymorphic_archive, T = my_type]': ... lots of intermediate instantiations ... error: incomplete type boost::serialization::extended_type_info_null<my_type> cannot be used to name a scope If nvp.hpp is included later (or not explicitly included at all, since I see that polymorphic_iarchive.hpp includes it at the end of its include block), all is well. A little more poking at it by hoisting out the nested includes from nvp.hpp directly into my source file found that including polymorphic_[io]archive.hpp before type_info_implementation.hpp makes the problem go away too. nvp -> level -> traits -> type_info_implementation I know Robert has fixed a bunch of include order issues, and I think I recall that some of those fixes were post-1.33.1. Is this a known one? Or is a reproducible test case needed? Or is this a real include order dependency that one simply must avoid?

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Pre-Built Libraries for gcc/Windows?
by David Greene 10 Mar '06

10 Mar '06

Does anyone have a set of pre-built Boost libraries that can be installed on a Windows system for use with gcc 3.2.1? Thanks. -Dave

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[statechart] - templated states do not compile (transit not defined)
by Oliver.Kowalke＠infineon.com 09 Mar '06

09 Mar '06

Hello, the code below doesn't compile (gcc-3.4.6 on Linux). 'transit in scope not defined' Any glue? Regards, Oliver #include <iostream> #include <stdexcept> #include <boost/mpl/list.hpp> #include <boost/statechart/custom_reaction.hpp> #include <boost/statechart/exception_translator.hpp> #include <boost/statechart/simple_state.hpp> #include <boost/statechart/state_machine.hpp> #include <boost/statechart/transition.hpp> namespace mpl = boost::mpl; namespace sc = boost::statechart; struct EvX : sc::event< EvX > {}; struct EvY : sc::event< EvY > {}; template< typename S > struct X; template< typename S > struct sm : public sc::state_machine< sm< S >, X< S >, std::allocator< void >, sc::exception_translator<> > { void unconsumed_event( const sc::event_base & ) { throw std::runtime_error( "unknown event!" ); } }; template< typename S > struct Z : public sc::simple_state< Z< S >, sm< S > > {}; template< typename S > struct Y; template< typename S > struct X : public sc::simple_state< X< S >, sm< S > > { typedef mpl::list< sc::transition< EvY, Y< S > >, sc::custom_reaction< sc::exception_thrown > > reactions; sc::result react( sc::exception_thrown const&) { try { throw; } catch ( std::exception const& e) { return transit< Z< S > >(); } <<=== error catch ( ... ) { return forward_event(); } } }; template< typename S > struct Y : public sc::simple_state< Y< S >, sm< S > > {}; int main() { try { sm< int > fsm; fsm.initiate(); fsm.process_event( EvY() ); fsm.process_event( EvX() ); return 0; } catch ( std::runtime_error const& e) { std::cerr << e.what() << std::endl; } catch (...) { std::cerr << "unhandled exception" << std::endl; } return -1; }

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