- Boost-users - lists.boost.org

[fusion] BOOST_FUSION_DEFINE_STRUCT at class scope
by Nathan Ridge 17 Jul '11

17 Jul '11

Hello, The documentation of BOOST_FUSION_DEFINE_STRUCT says it should be used at global scope. Why can't this function be used at namespace scope, and, especially, at class scope? Not being able to use it at namespace scope is just as annoyance because it means the current namespace(s) have to be closed before the macro and re-opened after it; but not being able to use it at class scope means that it cannot be used to declare nested structures which are fusion sequences at all. Is there another device that allows us to declare nested structure that are fusion sequences? Thanks, Nate.

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[Review] Type Traits Introspection library by Edward Diener starts tomorrow Friday 1
by Joel Falcou 17 Jul '11

17 Jul '11

According to the schedule, review for the Type Traits Introspection library by Edward Diener starts this friday and run till July 10th. =========== What is it? =========== The TTI library, which is an abbreviation for the 'Type Traits Introspection' library, allows a programmer to introspect at compile time the inner elements of a C++ type. The introspection process depends on specifying the name of the inner element by different macros for different types of elements, and then using a generated metafunction to determine whether that element exists within the enclosing type. The inner elements which can be introspected are type, class template, member data, member function, static member data, and static member function. The TTI library is based on the type_traits_ext portion of the Concept Traits Library, with improvements and additions, and also reproduces functionality ( without changing existing code ), for the purposes of completeness, from Boost.MPL regarding introspection of types and templates. The purpose of the library is to provide a consistent set of interfaces for doing compile-time introspection of a type, which other template metaprogrammers can use in their code. If you are at all interested in compile-time introspection of types, please take a look at the functionality of this library. =================== Getting the library =================== The library is available at http://svn.boost.org/svn/boost/sandbox/tti/ Note that this repository will be updated up to next thursday by Edward. =================== Writing a Review =================== The reviews and all comments should be submitted to the developers list, and the email should have "[TTI] Review" at the beginning of the subject line to make sure it's not missed. Please explicitly state in your review whether the library should be accepted. The general review checklist: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? And finally, every review should answer this question: - Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion.

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[serialization] writing private variables
by Sean Farrow 16 Jul '11

16 Jul '11

Hi: Is there a way to tell the serialization library to write private members. The members do have functions to get/set there values, but as far I know the serialization subsystem doesn't call these. Cheers Sean.

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[Pool] Attention all Pool users....
by John Maddock 16 Jul '11

16 Jul '11

Folks, I'm planning on merging the all new and shiny version of Boost.Pool in the sandbox under https://svn.boost.org/svn/boost/sandbox/guild/pool/ into Trunk pretty soon unless anyone objects. There are a lot of bug fixes in this version, plus updated docs (see https://svn.boost.org/svn/boost/sandbox/guild/pool/libs/pool/doc/pool.pdf) Please let me know if you spot any issues, or if there's something that needs addressing that hasn't been (no promises on that one though!). Regards, John.

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Sharing a complex object between two processes: Suggestions needed
by Nathan Lewis 15 Jul '11

15 Jul '11

Thanks so much for a great C++ library, Last night I read the complete archive looking for some tidbits of info to help me figure out how to move forward with a decision of the appropriate approach. I am fairly new to boost so I am hoping someone has some advice for my situation. I am trying to share instances of a c++ class that is auto-generated from xml schema. I am trying to hand this class off from a dll that a web service engine loads to another application for processing. This class is an in-memory implementation of the class and contains several objects which contain a lot of native stl c++ strings as well as other primitive types. I was hoping to use boosts circular buffer in shared memory, but began prototyping with a vector it and researching and I realized that the strings put in shared memory must use the basic_string construct. Having some concern about going through all of the auto generated code to change all of these types and concern over what affect that might have on the dll & service engine operation. I've seen some examples using shared memory that use the void allocator and thought maybe that is what I need to do, however I keep getting back to the fact that I've got a bunch of strings in this composite class and I don't know if that is torpedoing my attempts. I've seen there are many interprocess constructs, memory mapped regions, shared_ptrs and message ques etc. I also recently got to thinking that perhaps I should look at boost serialize to deal with the strings. I didn't want to leave the boost interprocess approach if there was some way to exchange instances of this class correctly using one of boost interprocess constructs. What I am hoping is that some could chime in with suggestions on different ways to use boost to achieve this and I'll try and go off and research it. Your input is greatly appreciated!

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[multi-array] Extracting dimension information from a multi-array
by Ryan McConnehey 15 Jul '11

15 Jul '11

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Re: [Boost-users] [Serialization] Writing an old version of a class
by Richard L. Aurbach 15 Jul '11

15 Jul '11

Don, I can't speak to what support is present in boost serialization, but I have a lot of code that needs to deal with multiple versions of classes or data structures. I've found that the best way to deal with that is to store a version number as a data member and then handle the schema evolution internally in the class. In general, it is the responsibility of a class to handle older versions "appropriately" whatever that means to you in your context. If the version number is the FIRST data member of the class (in an I/O or serialization context), then you can easily write code to handle multiple versions during I/O and/or serialization. Just my $0.02. Cheers, Rick Aurbach Aurbach & Associates, Inc. On Jul 15, 2011, at 11:00 AM, boost-users-request(a)lists.boost.org wrote: > From: Don <dm413-boost(a)intielectronics.com> > Date: July 15, 2011 7:27:07 AM CDT > To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> > Subject: [Boost-users] [Serialization] Writing an old version of a class > Reply-To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> > > > I apologize if this is a duplicate posting. I sent this 2 days ago, and it appears in the archives, but I never received it back from the list and there have been no replies, so I am posting it again. > > Using boost serialization, I would like to be able to write an old version of a class, so that I can save data in an "old" format to allow other users with an old version of my program to read the file. > > I see from the archives that this has come up before, and Robert Ramey indicated it was doable and on the todo list, but I don't see it in the release notes or documentation. Did anything every come of this? > > Or, has anyone else done this? Any suggestions on how to accomplish this? > > Thanks, > > Don

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The last (I think) of the Boostcon videos
by Marshall Clow 15 Jul '11

15 Jul '11

Chris' talk: Why C++0x is the Awesomest Language for Network Programming http://blip.tv/boostcon/why-c-0x-is-the-awesomest-language-for-network-prog… Luke's: Sweep-Line Algorithm for Voronoi Diagrams of Points, Line Segments and Medial Axis of Polygons in the Plane http://blip.tv/boostcon/sweep-line-algorithm-for-voronoi-diagrams-of-points… Boris: Boost.Process: Process management in C++ http://blip.tv/boostcon/boost-process-process-management-in-c-5368233 Joel's: Getting Jiggy with Proto — Hands-on Tutorial on C++ EDSL Design http://blip.tv/boostcon/getting-jiggy-with-proto-hands-on-tutorial-on-c-eds… Boris' other one: A Complete Overview on Boost.Jam and Boost.Build http://blip.tv/boostcon/a-complete-overview-on-boost-jam-and-boost-build-53… I think that this is all the Boostcon videos. I'll be checking later to make sure - but if you know of one that I've missed, then please let me know. BTW, Ruediger asked not to have his "Funding Boost development" talk recorded, and I didn't record any of the workshops. -- Marshall -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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[TTI] Review Going On
by Joel Falcou 15 Jul '11

15 Jul '11

A small reminder to ask potential reviews for Edward Diener's TTI Library to do so as we are heading to the end of the review period on the 17 july. If you have comments, questions or just want to submit a review, feel free to do so.

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Problem when compiling with 1.47 on Mac OS X 10.6.8
by Frank Astier 15 Jul '11

15 Jul '11

must have done something very silly, but code that used compiled fine now gives me: g++ -gfull -Wall -Werror -fexceptions -DDEBUG_TP -Ddarwin86 -I./ -Itp_datastruct/ -Iutil/ -I/usr/local/include -I/Users/frank/Sandbox/work -c -o objs/Profile.o tp_datastruct/Profile.cpp In file included from /usr/local/include/boost/type_traits/is_class.hpp:16, from /usr/local/include/boost/type_traits/is_abstract.hpp:55, from /usr/local/include/boost/type_traits/is_convertible.hpp:25, from /usr/local/include/boost/type_traits/is_enum.hpp:19, from /usr/local/include/boost/type_traits/is_signed.hpp:15, from /usr/local/include/boost/type_traits/make_unsigned.hpp:14, from /usr/local/include/boost/lexical_cast.hpp:33, from tp_datastruct/AttributeValue.h:13, from tp_datastruct/Profile.h:10, from tp_datastruct/Profile.cpp:3: /usr/local/include/boost/type_traits/is_union.hpp:38: error: expected primary-expression before ')' token /usr/local/include/boost/type_traits/is_union.hpp:38: error: a function call cannot appear in a constant-expression Any idea?? fastier(a)yahoo.com Frank fastier(a)yahoo.com

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