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[Fusion] `as_map` not for custom Associative Sequence
by TONGARI 04 Mar '13

04 Mar '13

I do see that the doc says "The elements of the sequence are assumed to be __fusion_pair__s.". But any chance for custom Associative Sequence which doesn't have fusion::pair as elements? Thanks.

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boost::statechart - two async machines in one process?
by Dick Bridges 03 Mar '13

03 Mar '13

I've been using asynchronous boost::statechart for 5+ years but that doesn't seem to count for much in this instance. I've wrapped myself around the axel and have no idea how to proceed. Any help would be greatly appreciated. I am attempting to create a program that contains two separate classes, each built on a boost::statechart state machine. The classes are similar but there is one-and-only-one class a and it creates instances of class b. At least, that was the plan. (Apologies if this diagram doesn't format correctly. Outlook is NOT being cooperative.) _______________________ ________________________ | boost::statechart | | boost::statechart | |______________________| |________________________| ^ ^ _________|______________ _________|______________ | struct a_statechart | | struct b_statechart | |_______________________| |_______________________| | | _________O____________ __________O___________ | struct a_impl | | struct b_impl | |----------------------------------| |-----------------------------------| | fifo_scheduler sched_ | | fifo_scheduler sched_ | | processor_handle asm_ | | processor_handle bsm_ | | boost::thread thread_ | | boost::thread thread_ | |_____________________| |______________________| | | _________o____________ _________o____________ | struct a | | struct b | |_____________________| |______________________| However, if the class b processor_handle (bsm_) is initialized, the class a state machine doesn't react to *any* events. If I comment out the bsm_ initialization, the class a state machine handles events as expected. If bsm_ is initialized (with our without creating the thread), the class a state machine doesn't respond to any event. The results are exactly the same if bsm_ is assigned in the ctor. Both asm_ and bsm_ are initialized in the ?_impl ctor: [usual stuff]: sched_(true), ?sm_( sched_.create_processor< ?_statechart >() ), thread_() { FWIW, The state machines in both classes are assigned a thread in the ?_impl ctor: boost::thread tmp( bind( &fifo_scheduler<>::operator(), &sched_, 0 ) ); thread_.swap( tmp ); Any assistance will be greatly appreciated. Regards, Dick Bridges The opinions and data in this missive are my own and do not necessarily represent the positions, strategies, or opinions of Western Digital Corporation. IMPORTANT: The information contained in this email and/or its attachments is confidential. If you are not the intended recipient, please notify the sender immediately by reply and immediately delete this message and all its attachments. Any review, use, reproduction, disclosure or dissemination of this message or any attachment by an unintended recipient is strictly prohibited. Neither this message nor any attachment is intended as or should be construed as an offer, solicitation or recommendation to buy or sell any security or other financial instrument. Neither the sender, his or her employer nor any of their respective affiliates makes any warranties as to the completeness or accuracy of any of the information contained herein or that this message or any of its attachments is free of viruses. Glenda: http://glenda.cat-v.org/gallery/

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[geometry] how to set number of points / chord length in buffer() join_round strategy?
by John Lilley 03 Mar '13

03 Mar '13

I see in the released buffer() algorithm, there is a chord length argument: void buffer(Input const & geometry_in, Output & geometry_out, Distance const & distance, Distance const & chord_length = -1) But I can't seem to find an equivalent for buffer_inserter<> with a join_round strategy. How do I set the chord length or number of approximating points? John Lilley

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threaded stopwatch or count down timer
by Sean Farrow 03 Mar '13

03 Mar '13

Hi all, I'm currently writing an application that requires either a stopwatch or a countdown timer. Is such a thing available in boost? Any help appreciated. Regards Sean.

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variant with shrink
by Niitsuma Hirotaka 02 Mar '13

02 Mar '13

boost::variant should be variant<int,int> => int variant<int,double> => double variant<int,boost::rational<int> > => boost::rational<int> variant<int,double,std::string> => variant<double,std::string> I wrote such extension https://github.com/niitsuma/variant_shrink

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Fwd: Describing "traits" of a class's members
by Chris Stankevitz 02 Mar '13

02 Mar '13

Hello, A week ago I started a thread here called "Can boost help me organize/parse lots of binary data?" As people started offering help, it because clear I had no idea what I was trying to ask. I come back with a clear question. The attached file defines: 1. TCPosition: an object that describes a position 2. TCDoubleTraits: an object that describes characteristics of a parameter represented as a double 3. TCUnsignedTraits: an object that describes characteristics of a parameter that is represented as an unsigned 4. TCPositionTraits: a collection of TC*Traits plus some boost::function magic to extract parameters from a TCPosition. 5. TCPositionTraits::PrintValues: a function that allows the user to print all values of a TCPosition The motivation for this round-about way of printing the parameters of a "position" is that I have to deal with some objects that have lots of parameters and I would like one central place where I define the characteristics of the values and their order. In this example, that place is TCPositionTraits. In my real life example I will want to store traits such as the way the data is encoded and the way in which the data needs to be transformed into "human readable" format. Question: Can you modify the attached program so that the object TCPositionTraits holds all the traits for the TCPosition object. Not just the traits for the "double" parameters, as is currently the case. Notably missing from TCPositionTraits is a reference to TCPosition::mSteps. Difficulty: This is a difficult question to answer due to the fact that TCPositionTraits has hard-coded in it the keyword "double". I cannot figure out how to remove this. Bonus: Bonus points if your answer looks something like "yes it is possible if you start using a boost concept which you apparently are not aware of". Note: You'll need the C++11 brace-initialization capability to compile this. I used "g++ -std=c++0x test.cpp" with gcc 4.6.3. Thank you, Chris

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[boost] Minimum GCC required to support build
by Michael Powell 02 Mar '13

02 Mar '13

Hello, What is the minimum GCC I will need to compile boost? All of it if I can, or majority of it? And then what might I be giving up? Specifically, I am working with GCC 4.4.3 in Ubuntu LInux 10.04 LTS. I'd like to upgrade that to 4.7 if not 4.8 for C++11 features. I've read it can be done, but that makes me nervous upgrading such a crucial part of the Linux tool chain. Also, bearing in mind that we will need to cross compile to ARM5: I believe crosstool-ng might be the thing that enables that. Any insights would be appreciated. Thank you. Regards, Michael Powell

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[CONFIG] static const definitions
by John M. Dlugosz 01 Mar '13

01 Mar '13

On 3/1/2013 3:09 AM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > But to be honest that looks like a BOOST_WORKAROUND rather than a full on > config macro to me - the reason being that it just looks like a compiler > specific bug plain and simple, rather than a missing feature. So maybe I'm looking in the wrong place? But, I don't find anything in the docs for "Workaround" other than the Config library and Boost.Compatibility which is for bad std headers.

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[CONFIG] static const definitions
by John M. Dlugosz 01 Mar '13

01 Mar '13

On 2/27/2013 3:13 PM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > I think it would be great to have a boost macro to test. > If no one else is aware of a readily-available macro in boost config, > maybe you can log a bug and provide a patch to get the ball rolling? > > Brian I've never done that before for Boost. Is there a guide you can point me to, on the correct procedures to follow?

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building boost with a specific msvc runtime
by Tom K. 01 Mar '13

01 Mar '13

I'm trying to get a consistent VC++ runtime for distribution, but I cannot find anything getting boost/bjam to cooperate. I have successfully compiled libcurl and UnitTest++ with the method in this link. http://tedwvc.wordpress.com/2009/08/10/avoiding-problems-with-vc2005-sp1-se… The idea being that you include a header in each file and then it will only have that one runtime dependency. b2 has options for setting cxxflags, though they do not seem to honor my /FI compile option to use the header and force the correct runtime. I assume that they are using something else. I suppose boost doesn't use the msvc flags. How should I accomplish this?

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