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[rpc] Introducing Boost.Reflect, Boost.CMT, and Boost.RPC
by Daniel Larimer 29 Aug '11

29 Aug '11

I have just recently completed my first alpha release of a generic RPC library designed to support different protocols (JSON, XML, Protocol Buffers) and different transports (UDP, TCP, HTTP) in a generic manner. Currently only JSON over TCP is implemented. This library builds on top of my Boost.Reflect library which provides simple reflection along with a generic type-erasure construct, boost::reflect::any_ptr<T> Lastly all of this builds on top of my Boost.CMT (Collaborative Multi-Tasking Library) which seems to be along the same lines as Oliver's Boost.Strand library, but with a simpler interface. It is built on top of Boost.Context. This allows the RPC to be asynchronous, thread-safe, and free of nasty completion handlers. I have documentation of all three libraries posted here. http://bytemaster.github.com/dev/modules.html I would like to know if I am barking up the right tree here and if anyone has any feedback. If someone has a real project they would like to see this code incorporated into I would be more than willing to focus my development effort toward those needs.

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[MSM] event deferral and dispatching with base event
by Richard Szabo 28 Aug '11

28 Aug '11

Hi Christophe I'm running the attached test program it generates the following output : entering: Idle MS1_ leaving: Idle Action: MS1::onEvent1 entering: RunningStateMachine MS1_ entering: RunningStateMachine::PseudoEntry1 leaving: RunningStateMachine::PseudoEntry1 entering: Inner1 RunningStateMachine_ entering: InnerState11 FwdGuard: returns:0, event: event5 FwdGuard: returns:0, event: event1 FwdGuard: returns:0, event: event1 FwdGuard: returns:0, event: event5 FwdGuard: returns:0, event: event1 FwdGuard: returns:0, event: event1 FwdGuard: returns:0, event: event5 FwdGuard: returns:0, event: event1 FwdGuard: returns:0, event: event1 FwdGuard: returns:0, event: event5 I believe it is incorrect after state machine entered state InnerState11 . FwdGuard should have been called ones with event5 and than 3 times with event1 and event1 shall have triggered after the first dispatching a no transaction. But this case no trans was triggers on even1 and and the deferred event5 got dispatched even there was no state change for every event1 dispatching. this breaks our code execution completely :(. Br. Richard

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Review Request: Singularity
by Ben Robinson 28 Aug '11

28 Aug '11

Hello, This is a request for a formal review of Singularity, for inclusion into Boost. The submission is attached as a compressed zip file, and is also publicly available for download from GitHub at https://github.com/icaretaker/Singularity. The Singularity Design Pattern allows you to restrict any class to a single instance. Unlike the infamous Singleton, Singularity gives you direct control over the lifetime of the object, does not require you to grant global access to the object, nor does it limit you to the default constructor for that object. I would like to thank the Boost community for their invaluable feedback regarding the features and implementation details of Singularity. I have compiled and run Singularity on 4 different compilers: GCC 4.5, MSVC++ 2010, the Texas Instruments CL2000 compiler targeting the 2803x processor, and the Green Hills compiler targeting the Cortex-A8 ARM processor. Thank you, Ben Robinson, Ph.D. P.S. I have also implemented Singularity in C++11 using variadic templates and rvalue references to achieve perfect function forwarding. These source files are located in the /cpp11 subdirectory, but that is not part of the submission, unless Boost is accepting C++11 libraries at this time.

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[quickbook] Failure building on trunk
by Edward Diener 27 Aug '11

27 Aug '11

Trying to generate some documentation using the latest on Boost trunk, the build of quickbook works with gcc but failed using toolset-msvc-10.0 with: "compile-c-c++ C:\Programming\VersionControl\boost\bin.v2\tools\quickbook\src\msvc-10.0\release\link-static\threading-multi\id_generator.obj id_generator.cpp C:\Programming\VersionControl\boost\boost/unordered/detail/buckets.hpp(220) : error C2668: 'boost::addressof' : ambiguous call to overloaded function C:\Programming\VersionControl\boost\boost/utility/addressof.hpp(51): could be 'T *boost::addressof<boost::unordered::detail::bucket<A>>(T &)' with [ T=boost::unordered::detail::bucket<std::allocator<std::pair<const std::string,quickbook::id_generator::id>>>, A=std::allocator<std::pair<const std::string,quickbook::id_generator::id>> ] C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\xmemory(109): or '_Ty *std::addressof<boost::unordered::detail::bucket<A>>(_Ty &)' [found using argument-dependent lookup] with [ _Ty=boost::unordered::detail::bucket<std::allocator<std::pair<const std::string,quickbook::id_generator::id>>>, A=std::allocator<std::pair<const std::string,quickbook::id_generator::id>> ] while trying to match the argument list '(boost::unordered::detail::bucket<A>)' with [ A=std::allocator<std::pair<const std::string,quickbook::id_generator::id>> ] C:\Programming\VersionControl\boost\boost/unordered/detail/buckets.hpp(207) : while compiling class template member function 'void boost::unordered::detail::buckets<A,Unique>::delete_buckets(void)' with [ A=std::allocator<std::pair<const std::string,quickbook::id_generator::id>>, Unique=true ] C:\Programming\VersionControl\boost\boost/unordered/detail/table.hpp(564) : see reference to class template instantiation 'boost::unordered::detail::buckets<A,Unique>' being compiled with [ A=std::allocator<std::pair<const std::string,quickbook::id_generator::id>>, Unique=true ] C:\Programming\VersionControl\boost\boost/unordered/detail/unique.hpp(392) : see reference to class template instantiation 'boost::unordered::detail::types<K,V,H,P,A,E,Unique>' being compiled with [ K=std::string, V=std::pair<const std::string,quickbook::id_generator::id>, H=boost::hash<std::string>, P=std::equal_to<std::string>, A=std::allocator<std::pair<const std::string,quickbook::id_generator::id>>, E=boost::unordered::detail::map_extractor<std::string,std::pair<const std::string,quickbook::id_generator::id>>, Unique=true ] C:\Programming\VersionControl\boost\boost/unordered/unordered_map.hpp(63) : see reference to class template instantiation 'boost::unordered::detail::map<K,H,P,A>' being compiled with [ K=std::string, H=boost::hash<std::string>, P=std::equal_to<std::string>, A=std::allocator<std::pair<const std::string,quickbook::id_generator::id>> ] c:\programming\versioncontrol\boost\tools\quickbook\src\id_generator.hpp(52) : see reference to class template instantiation 'boost::unordered::unordered_map<K,T>' being compiled with [ K=std::string, T=quickbook::id_generator::id ] call "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\vcvarsall.bat" x86 >nul cl /Zm800 -nologo @"C:\Programming\VersionControl\boost\bin.v2\tools\quickbook\src\msvc-10.0\release\link-static\threading-multi\id_generator.obj.rsp" ...failed compile-c-c++ C:\Programming\VersionControl\boost\bin.v2\tools\quickbook\src\msvc-10.0\release\link-static\threading-multi\id_generator.obj..."

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Re: [boost] [proto] Problems with operator <<
by John Maddock 27 Aug '11

27 Aug '11

> Folks, > > I'm having no end of problems with operator<< and proto. > > In the beginning, operator << was overloaded for stream output and > everything worked OK, then I added the left shift operator<< to the list > of protoized operators in the grammar and everything broke. The strange > thing is that: > > std::cout << a+b; > > correctly finds my stream out overload: > > template <class Exp> > inline std::ostream& operator << (std::ostream& os, const > big_number_exp<Exp>& r) > > But > > std::cout << a; > > no longer calls: > > template <class Backend> > inline std::ostream& operator << (std::ostream& os, const > big_number<Backend>& r) > > But calls the proto << operator instead. > > I'm at a complete loss to explain this, both of my overloads are in the > same namespace as their respective types, and as far as I can see both > should be preferred to the proto versions. To answer my own question - in case anyone else gets bitten by this - the answer is you need to provide overloads with both const and non-const reference RHS arguments to effectively hide the proto operator versions. Still some hair left yours.... John.

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[program_options] Some methods take const char*, others take std::string
by Gabriel Redner 27 Aug '11

27 Aug '11

Hi all, Some methods in program_options accept const char*s (e.g. option_description constructor), while others take const std::string&s (e.g. option_description::key). This makes no difference to the user if he is passing string literals, but becomes annoying if he wants to pass strings, or expressions which return strings. Of course he can put (...).c_str() everywhere, but this is ugly and unnecessary, since program_options just takes its parameters and shoves them into string variables anyways. Since changing the parameter types to const std::string& should not break existing code, I do not see a downside to doing so (plus, it would allow me to get rid of .c_str()s everywhere :-). Does it seem reasonable for program_options public APIs to accept std::strings instead of const char*s? If so I would be happy to do the legwork and submit a patch. Thanks, -Gabe

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Reg : Boost Error - any.hpp
by Vijay 27 Aug '11

27 Aug '11

Hi, We are using boost version 1.31.0 in our C++ code. Our OS is HP-UX 11.31 Itanium. We use aCC compiler. While compiling my code, I'm getting the below error. Can any one help me to fix this issue ? "/opt/app/q1app2c4/boost-1.31.0/boost/any.hpp", line 125: error #2070: incomplete type is not allowed ValueType held; ^ detected during: instantiation of class "boost::any::holder<ValueType> [with ValueType=Fcif]" at line 32 instantiation of "boost::any::any(const ValueType &) [with ValueType=Fcif]" at line 35 of "/opt/app/q1app2c4/src/share/incl/Fcif.h" Cheers, Vijay....(V2K) E-mail to : v2k.sweet(a)gmail.com Catch me @ 9962003328, 7871181610 Blackberry PIN : 259943F3 "Life is just one grand sweet song, so start the music."

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accumulator serializable?
by Neal Becker 26 Aug '11

26 Aug '11

I have typedef accumulator_set<el_t,stats<tag::mean,tag::abs_sqr> > accum_t; What would I need to do to serialize an accum_t object?

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[review] Conversion review continues through 8/29
by Gordon Woodhull 26 Aug '11

26 Aug '11

Folks, The review of Vicente Botet Escriba's Conversion library continues through this Monday. So far discussion has been light and there have been only a couple of reviews. I'll attempt to provoke some discussion by offering my own review and by bringing in some opinions made off-list. Your input would be greatly appreciated. Thanks, Gordon

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[Containers] Marshalling deques
by Brian Wood 26 Aug '11

26 Aug '11

There's a thread here -- http://groups.google.com/group/comp.lang.c++/browse_thread/thread/0a6a19f83… that I'd like to mention. Does the deque in the Containers library have support for accessing the chunks it uses? Would you be willing to add a function that gives that? Tia. Shalom, Brian Wood Ebenezer Enterprises http://webEbenezer.net

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