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memory overhead of boost::function<>
by Zachary Turner 12 Aug '09

12 Aug '09

Is there an easy way to calculate the minimum and maximum memory overhead required by a single instance of boost::function? It's not easy to trace through the code and find all instances of allocations / deallocations and member variables. sizeof(boost::function<T>) appears to be 32 on my machine for all values of T but I'm not sure if there are certain types of functions which might be less than this or more than this. Is there any way to reduce the memory overhead of boost::function? 32 is quite a bit on an x86 architecture, considering a normal function pointer on the same machine takes only 4 bytes. I was thinking of using boost::function<> as the basis for a generic inter-object messaging system where there may be thousands of objects in the systems any of which might want to communicate via event sinks / sources implemented via boost::function<> and callback registration. But if the memory overhead is 32-bytes per object at a minimum, and possibly more with more complicated function objects or on 64-bit architectures, then it seems like it could quickly grow out of hand if there were many listeners.

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[Test] Making use of boost::exception_diagnostic_information and friends
by Alexander Lamaison 12 Aug '09

12 Aug '09

Are there any plans to let the Boost.Test runner make use of the extra information that the Boost.Exception library is able to 'inject' into exceptions? Currently, when an exception is caught by the test runner and it is derived from std::exception, the report includes the what() string but is not able to give any infomation about the location the exception was thrown from: unknown location(0): fatal error in "cfstr_shellidlist_multiple_items": std::runtime_error: All items in a DataObject must have the same parent. When an exception is thrown using the BOOST_THROW_EXCEPTION() macro, extra information including the location it was thrown from are added to the exception: http://www.boost.org/doc/libs/1_39_0/libs/exception/doc/BOOST_THROW_EXCEPTI…. This allows callers to pass an exception to diagnostic_infotmation() and get a string detailing the exact nature of the exception thrown. It should be possible to let the test runner extract this information in the same way that diagnostic_infomation does and use it to improve the test runner output. Many thanks. Alex

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[mpi] what is the equivalent of MPI_COMM_SELF?
by alfC 12 Aug '09

12 Aug '09

Is there something equivalent to the constant MPI_COMM_SELF in Boost.MPI? It is easy to refer the MPI_COMM_WORLD since this is the default constructor of boost::mpi::communicator, but it seems that the only way to have the equivalent of MPI_COMM_SELF is to do boost::mpi::communicator self(MPI_COMM_SELF, boost::mpi::communicator::comm_attach); does it make sense to define a global object with that name to refer to the communicator in current process? (this can be handy to switch to serial bahavior and parallel executrion when debugging the code, I guess). Thanks, Alfredo

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[BGL] Can't correctly copy data
by Caligula 12 Aug '09

12 Aug '09

Hi, I've been working on this bug for a few weeks now. Its sort of a show stopper for me. I'm not able to correctly copy a simple string datum from one element to another such element. Just go to http://pastebin.com/m6f57be95 And see pastebin references. Either I'm doing something wrong or BGL is seriously flawed. Thanks Caligula

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[Boost.Array] Checked iterator in debug mode
by dariomt＠gmail.com 12 Aug '09

12 Aug '09

Hi list, I can see that boost::array::operator[] has bounds checking in debug mode. Is there a way to get checked iterators also? Like safe STL style. If not, would that be a useful addition to boost::array? And if I was to add checked iterators to boost::array, do you have any recommendations? Any boost::detail::checked_iterator I can reuse? Thanks!

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[serialization] boost::system::error_category
by Rutger ter Borg 12 Aug '09

12 Aug '09

Dear list, I'm trying to write serialization code for Boost.System's error_codes, however I'm having trouble to serialize/deserialize an error_category, which are polymorphic singleton objects. I guess when saving, type information needs to be stored, like with polymorphic pointers? When loading, a global function (get_generic_category(), get_system_category(), etc.) could be used to obtain a reference to the singleton object. Is there any way to use the exported type information in such way that a reference to the correct singleton is obtained? Any suggestions on how to approach this? Thanks in advance, Kind regards, Rutger ter Borg

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mpl::map ---> fusion::map conversion problems
by Zachary Turner 11 Aug '09

11 Aug '09

Hello, I'm trying to convert an MPL map to a fusion map using boost::fusion::result_of::as_map. I have the following code, with some of the leading-in code omitted for brevity although I don't think it's relevant: //listener_info_types := mpl::list< pair<handler<E>, token<H> > > typedef typename boost::mpl::transform< handler_types, token_types, parameterize_pair<boost::mpl::_1, boost::mpl::_2> >::type listener_info_types; //listener_info_lookup = mpl::map<EventType, pair<handler<E>, token<H> > typedef typename boost::mpl::transform< SupportedEvents, listener_info_types, boost::mpl::inserter< boost::mpl::map<>, boost::mpl::identity<boost::mpl::_1> > >::type listener_info_lookup; typedef typename boost::fusion::result_of::as_map<listener_info_lookup>::type fusion_listener_map; Deleting the last line and everything works. I've successfully used a similar technique to convert mpl vectors to fusion vectors in the past, is it not possible for maps? Or more likely I'm just doing something wrong? I can post more code if necessary including full type definitions leading up to all these previous typedefs, but basically I have a class parameterized initially with an mpl::list of some number of types. I then do a sequence of mpl::transform calls, none of which with use a custom inserter. The end result of all of that is listener_info_types above. So listener_info_types should be an mpl::list. The next call should then create an mpl::map, (SupportedEvents is the initial type used to parameterize the class, so an mpl::list as previously mentioned). Any suggestions? Thanks Zach

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casting with boost
by zeev mintz 11 Aug '09

11 Aug '09

hi, i'm trying to do some simple casts using boost, to and from webToolkit widgets, i.e int i = 42; WString str; str = boost::lexical_cast<WString>(i); i get a compilaton error that goes something like this: lexical_cast.hpp(768): no operator ">>" matches these oprands... could it be a matter of updating my boost version? ( i'm using boost version 1.35) is there another way to make conversions without boost? thanks, Shalev.

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Synchronous problem with asio
by Dan Benčík 11 Aug '09

11 Aug '09

Dear everybody, I have a problem using asio. My client/server application requires only synchronous communication. So, using the examples for synchro from the boost homepage, I have set up two procedures to send and receive data. Their code is as follows: void vReceive(tcp::socket & socket, std::string & szDest){ char szTmp_Buf [BUF_LEN + 1]; szDest = ""; std::cout << "Entering vReceive . . ." << std::endl; for (;;){ char szBuf [BUF_LEN]; boost::system::error_code error; uInt uiBytes_Recv = socket.read_some(boost::asio::buffer(szBuf), error); std::cout << " Read " << uiBytes_Recv << " bytes" << std::endl; if (error == boost::asio::error::eof) break; // Connection closed cleanly by peer. else if (error) throw boost::system::system_error(error); // Some other error. memcpy((void*) szTmp_Buf, (void*) szBuf, uiBytes_Recv ); szTmp_Buf[ uiBytes_Recv ] = '\0'; szDest += szTmp_Buf; }; std::cout << "Received" << szDest << std::endl; std::cout << "Leaving vReceive . . ." << std::endl << std::endl; }; void vSend(tcp::socket & socket, std::string & szSrc){ std::cout << "Entering vSend . . . " << std::endl; std::cout << "Sending " << szSrc << std::endl; boost::system::error_code ignored_error; boost::asio::write(socket, boost::asio::buffer(szSrc), boost::asio::transfer_all(), ignored_error); std::cout << "Leaving vSend . . . " << std::endl << std::endl; }; These procedures are just wrappers for the lines of code extracted from the boost examples. In my test applications, the client calls vReceive(socket, szDate); vSend(socket, std::string("Chop Suey!") ); vReceive(socket, szDate); vSend(socket, std::string("Halo")); and the server calls vSend(socket, message); vReceive(socket, szReceived); vSend(socket, message); vReceive(socket, szReceived); just to test the functionality. The problem is that both applications freeze after the first information exchange, as I have depicted on the following picture ( http://eubie.sweb.cz/asio_problem.JPG ). It seems that vReceive() procedure on the client side doesn´t finish while vSend() finishes on the server side. So, does anybody have any idea, what might be wrong? Just in case someone wanted to replicate the problem, I uploaded the complete sources to http://eubie.sweb.cz/asio_problem.rar file. Thank you all in advance, Daniel.

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[Boost-users] http://www.boost.org/doc/libs/1_39_0/libs/regex/doc/vc71-performance.html
by Jerry Jeremiah 11 Aug '09

11 Aug '09

I have a couple questions. http://www.boost.org/doc/libs/1_39_0/libs/regex/doc/vc71-performance.htm l references PCRE 3.9 but http://www.pcre.org/ says that the current version is PCRE 7.9. I would really like to see current values for performance comparisons. Where would I get the software for this comparison? Is the source part of the Boost library? Thanks, Jerry

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2d array arg, f( int m, int n, int a[m][n] ) with multi_arrays ?
by Denis-B 11 Aug '09

11 Aug '09

Folks, how can I do the following with multi_arrays please ? void f( int m, int n, int a[m][n] ) // legal C99 ? dunno -- would be nice { ... a[j][k] = ... } ... int *a; // m*n ints, e.g. an image f( m, n, a ); thanks, cheers -- denis -- View this message in context: http://www.nabble.com/2d-array-arg%2C-f%28-int-m%2C-int-n%2C-int-a-m--n--%2… Sent from the Boost - Users mailing list archive at Nabble.com.

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[Serialization] Stream error when serializing float and unsigned int
by D Kruithof 10 Aug '09

10 Aug '09

Hello All, When serializing this class: class { float a; unsigned int b; }; i get a stream error upon de-serializing, when 'a' has the value infinity. Is this a bug? I included a (very small) program which shows the error. It crashes on iteration 3. I use the mingw 3.4.5 compiler with boost 1.38 (no changes have been made to serialization since 1.38) on windows XP. Thanks, D Kruithof

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[mpi] building boost::mpi libs
by James C. Sutherland 10 Aug '09

10 Aug '09

I have successfully built the boost MPI libraries on my mac. When trying on Linux I am having problems with the compiler not including the path for mpi.h. For example, I get errors like: > gcc.compile.c++ bin.v2/libs/mpi/build/gcc-3.4.6/release/threading- > multi/python/datatypes.o > In file included from ./boost/mpi/python/config.hpp:15, > from ./boost/mpi/python/serialize.hpp:23, > from libs/mpi/src/python/datatypes.cpp:13: > ./boost/mpi/config.hpp:20:17: mpi.h: No such file or directory I am not familiar with bjam. My MPI installation is in a non-standard location and I added > using mpi : /uufs/chpc.utah.edu/sys/pkg/mpich2/std/bin/mpicxx ; to my user-config.jam file. How do I tell bjam to look somewhere special for the mpi headers? Thanks for any tips. James

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[statechart] Non-Const Machine Pass-throughs and state_cast
by Grant Erickson 10 Aug '09

10 Aug '09

I am using Boost::Statechart for the first time, throwing in the bin a history of hand-coded and other class-based implementations of my own design, to realize a rather simple machine consisting of four events (start/stop/suspend/resume) and four states (stopped/running/stopped-suspended/running-suspended). The machine is effectively a timer and wraps another internal timer class that can be stopped/started and suspended/resumed. This is all the machine does. The internal timer class can get/set its interval and can also get/set a delegate, that is called (if set) when the timer fires. These internal timer management interfaces are "passed through" to the state machine interface, such that application/test code is as follows: ...(TimerDelegate & inDelegate, float inInterval) { Timer theTimer; theTimer.initiate(); BOOST_ASSERT(!theTimer.IsSuspended()); BOOST_ASSERT(!theTimer.IsRunning()); DisplayState(theTimer); theTimer.SetDelegate(inDelegate); theTimer.SetInterval(inInterval); cout << "The delegate is " << theTimer.GetDelegate() << endl; cout << "The interval is " << theTimer.GetInterval() << endl; BOOST_ASSERT(!theTimer.IsSuspended()); BOOST_ASSERT(!theTimer.IsRunning()); DisplayState(theTimer); theTimer.process_event(Events::Start()); BOOST_ASSERT(!theTimer.IsSuspended()); BOOST_ASSERT(theTimer.IsRunning()); DisplayState(theTimer); The delegate does the real work of the program and receives events that drive the timer machine. Where I have run into a problem is that my machine "pass through" setter methods allowing the delegate to be set or the timer interval to be changed (neither of which materially alter the state of the machine) cannot be called as they are non-const qualified whereas their corresponding getters work fine since they are const qualified. I've worked around this in the short term by qualifying the setters as const and then qualifying the data members as mutable; however, this strikes me as flat-out ugly and wrong. Is there a better way to accomplish this? Am I misusing the template/design pattern? I suppose I could applying a const_cast(); however, that seems just as bad as my existing workaround. class InternalTimer; struct TimerDelegate { virtual void TimerDidFire(const InternalTimer &inTimer) const = 0; }; class InternalTimer { public: InternalTimer(void); : ~InternalTimer(void); TimerDelegate *GetDelegate(void) const; float GetInterval(void) const; void SetDelegate(TimerDelegate *inDelegate); void SetInterval(float inInterval); void Start(void); void Stop(void); private: TimerDelegate * mDelegate; float mInterval; }; struct ITimerManagement { public: virtual TimerDelegate *GetDelegate(void) const = 0; virtual float GetInterval(void) const = 0; virtual void SetDelegate(TimerDelegate * inDelegate) = 0; virtual void SetInterval(float inInterval) = 0; }; struct IRunning { public: virtual bool IsRunning(void) const; protected: IRunning(bool inRunning); private: bool mRunning; }; struct ISuspended { public: virtual bool IsSuspended(void) const; protected: ISuspended(bool inSuspended); private: bool mSuspended; }; struct Active; struct Timer : state_machine< Timer, Active > { public: TimerDelegate * GetDelegate(void) const { return (state_cast< const ITimerManagement & >().GetDelegate()); } float GetInterval(void) const { return (state_cast< const ITimerManagement & >().GetInterval()); } void SetDelegate(TimerDelegate *inDelegate) { state_cast< ITimerManagement & >().SetDelegate(inDelegate); // XXX } void SetInterval(float inInterval) { state_cast< ITimerManagement & >().SetInterval(inInterval); // XXX } bool IsRunning(void) const { return (state_cast< const IRunning & >().IsRunning()); } bool IsSuspended(void) const { return (state_cast< const ISuspended & >().IsSuspended()); } }; struct Timer; struct Stopped; struct Running; struct StoppedSuspended; struct RunningSuspended; struct Active : ITimerManagement, simple_state< Active, Timer, Stopped > { virtual TimerDelegate * GetDelegate(void) const { return (mInternalTimer.GetDelegate()); } virtual float GetInterval(void) const { return (mInternalTimer.GetInterval()); } virtual void SetDelegate(TimerDelegate *inDelegate) { mInternalTimer.SetDelegate(inDelegate); } virtual void SetInterval(float inInterval) { mInternalTimer.SetInterval(inInterval); } void Start(void) { mInternalTimer.Start(); } void Stop(void) { mInternalTimer.Stop(); } private: InternalTimer mInternalTimer; }; struct Running : IRunning, ISuspended, state< Running, Active > { public: typedef mpl::list< transition< Events::Stop, Stopped >, transition< Events::Suspend, RunningSuspended > > reactions; Running(my_context inContext) : my_base(inContext), IRunning(true), ISuspended(false) { context< Active >().Start(); } ~Running(void) { context< Active >().Stop(); } }; Regards, Grant

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Re: [Boost-users] [Accumulators] Questions about the library
by dhruva 10 Aug '09

10 Aug '09

Hello, > Date: Thu, 25 Jun 2009 03:41:49 -0700 (PDT) > From: adish > Subject: Re: [Boost-users] [Accumulators] Questions about the library > To: boost-users(a)lists.boost.org > > > > > > ? ?2. If my platform does not support HW floating point ops, and all my > > > ? ?sample values are, e.g. ints, is there a way to specify that the > > > *computation > > > ? ?*and *return value itself* (i.e. result_type, e.g. the mean) will be done > > > ? ?in ints (naturally, at the cost of precision)? > > > > I have used UDT as I needed some extra information from the results (as I was > working on data from a time series). The reverse, using a POD like int must be > possible. Instead of the first argument being float/double, use an int. If that > does not work, you can wrap an int in a UDT, implement some of the operators > like '=', '<', '/' depending on the accumulator you plan to use (I did that as I > needed to send a UDT). > > Using an int still returns a float -- which is quite sensible. You might be able to write a custom extractor which can return an int. I have not explored it. I always thought the type you give as input is the type that gets returned. > By UDT do you mean User Defined Type? > This is an interesting approach. > I didn't realize that the result_type depends on the value type in > that way, I didn't see any UDTs mentioned in the docs. Yes, I mean writing a class/struct. I had to overload '<', '>', '+=' and '/' and I use it for variance, mean, median, min, max and my implementation of percentile. Remember to specialize std::numeric_limits for the UDT you write. Else, the min and/or max will have values that you have not added in the accumulator (garbage values). I had a tough time debugging it and finding the solution. Also, on Windows, you need to derive your specialization from _Num_base. As for implementing a generic rolling type: 1. You need to store your values in a circular buffer. 2. Each time you add a value into the buffer, pass the contents to a pristine accumulator. This may be sub optimal but works. Especially for those calculations where it is not easy to remove the effect of the first data that you want to pop. I had to do it this way because I was dealing with time series. If I want a rolling computation for a 1 hour window, I might add 1 sample and may have to remove more than 1 sample to ensure first-last is 1 hour window in the buffer. -dhruva Love Cricket? Check out live scores, photos, video highlights and more. Click here http://cricket.yahoo.com

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[serialization] Uninitialized member in xml_archive_exception
by Gevorg Voskanyan 10 Aug '09

10 Aug '09

Hi, A coworker of mine has found an issue in boost::archive::xml_archive_exception - the constructor does not initialize the 'code' member. As the issue is not fixed in trunk yet, I went ahead and created the ticket #3331 to track it. Given the triviality of the fix, any chance it making into 1.40 ? Thanks, Gevorg

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how to Sort boost collection class using multi sorting options/criteria
by ch.asad＠gmail.com 10 Aug '09

10 Aug '09

Hi I am using boost collection class. I did sorting e.g apply a quick/bubble sort algo , but i want to do sorting using multiple criteria. how we can implement using boost. Do boost have any classes or functions through which I can easily sort the data using multiple options? Thanks. Asad -- View this message in context: http://www.nabble.com/how-to-Sort-boost-collection-class-using-multi-sortin… Sent from the Boost - Users mailing list archive at Nabble.com.

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How shared_from_this() work when it inherited from more than one time
by R. P. Janaka 10 Aug '09

10 Aug '09

please can anyone explain the reason for the following behavior #include <iostream> #include <boost/enable_shared_from_this.hpp> using namespace std; class A; typedef boost::shared_ptr<A> A_sptr_t; class B; typedef boost::shared_ptr<B> B_sptr_t; class A : public boost::enable_shared_from_this<A> { public: A() {} virtual ~A() {} }; class B : public A, public boost::enable_shared_from_this<B> { public: B() {} virtual ~B() {} void f(void) { cout << "this is working " << boost::enable_shared_from_this<B>::shared_from_this() << endl; } }; int main() { B_sptr_t b(new B()); b->f(); return 0; } the program will be terminated with the following message terminate called after throwing an instance of 'boost::bad_weak_ptr' what(): boost::bad_weak_ptr Aborted -- Regards, R. P. Janaka

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[Asio] io_service::work::reset()
by Robert Jones 10 Aug '09

10 Aug '09

boost version 1.39.0 The documentation on io_service includes an example of calling work.reset(), which is a pretty essential piece of functionality. The documentation page on io_service::work does not list reset() as a member function. Am I missing something? - Rob.

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[MultiIndex] how to reindex
by Igor R 10 Aug '09

10 Aug '09

Hello, Is it possible to rebuild container indices? I couldn't find any appropriate method in the docs, and even the "swap-trick" doesn't seem to work. The only way that worked so far was to rebuild the container from scratch...

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[signals2, bind] connecting a slot with unrelated signature
by Igor R 09 Aug '09

09 Aug '09

Hello, Lets assume we've got an arbitrary signal that we don't know it's exact signature, and a function we'd like to connect as a slot. The function ignores all the signal arguments: void callback() { std::cout << "kuku" << std::endl; } int main() { signals2::signal<void(int, double, int)> sig; sig.connect(boost::bind(callback)); sig(); } The above compiles and works. Now I'd like not just to ignore signal's args, but to pass my own param: void callback(int cookie) { std::cout << cookie << std::endl; } int main() { signals2::signal<void(int, double, int)> sig; // I'd like to bind cookie=5 and to connect such a binder to the signal. // Is this possible without defining "manual" functors? sig.connect(???); sig(); }

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[Test] BOOST_TEST_NO_MAIN with pre-built BoostPro libraries
by Alexander Lamaison 09 Aug '09

09 Aug '09

Is it possible to create one's own main() implementation when using the pre-built Boost libraries from BoostPro? The difficulty seems to be that, even if I define BOOST_TEST_NO_MAIN before including unit_test.hpp, the main method still exists in the pre-built library and this causes a linker conflict. The existing code I'm wokring on specifies /FORCE to the linker to make our main override the library main but I think that's a horrible solution and would really like to try something else. Even better would be if there were a way to only invoke our code, which includes calls to framework::run(test), if a particular command-line argument were present. In all other cases it would be nice to have the default test runner behaviour. I think this may be wishful thinking though. Any advice is greatly appreciated. Alex

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Praise for boost.units
by Adrien Guillon 09 Aug '09

09 Aug '09

Just wanted to shower praise upon boost.units, which has finally filled a need I've had for a very long time. I am currently working with engineers to rebuild a simulation model, and boost.units has forced everyone to be consistent with their units... it has also forced the engineers to spend a few minutes arguing amongst themselves about the units of this variable or the other every once in a while... "is that a newton per meter squared?! No.. newton times meter... no it's... newton something else"... exactly what it should do! Good library! AJ

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Re: [Boost-users] question about multi_array use
by Alle Meije Wink 09 Aug '09

09 Aug '09

Dear Overmind and Anton, thanks for your answers. Let's see if I understand! Yes, multi_array<int, 2> and multi_array<int,3> are different types (classes?). But I wouldn't mind using a template class to wrap it if that meant I could code it once, instead of 8 times for 8 different possible dimensionalities. Would it be able to define a template class in the way I described? Overmind, I guess compared to what I had in mind (define the data container of the image [template?] class as a multi_array with a dimensionality given as a size_t parameter), the CRTP struct you are talking about specifies all of the possible types. Is that correct? If I understand it correctly then this does what I want, but does that mean that in the worst-case scenario, I have to write out the functionality for all different dimensionalities? If the parameterised template class idea is possible, that would save some typing! Best wishes, Alle Meije > From: OvermindDL1 <overminddl1(a)gmail.com> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] question about multi_array use > Message-ID: > <3f49a9f40908071709rbd1ad80k4c5170093588f4d(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > On Fri, Aug 7, 2009 at 2:04 PM, Anton Daneyko<self(a)mezhaka.com> wrote: > >> Hello, >> >> I might be wrong, but it seems the answer is "no you can't do that", because >> the dimensionality is a template parameter multi_array<int, 2> and >> multi_array<int, 3> are different types. However I would like to hear some >> else' opinion as well. >> >> Regards, >> Anton Daneyko. >> >> On Fri, Aug 7, 2009 at 3:48 PM, Alle Meije Wink <a.m.wink(a)gmail.com> wrote: >> >>> Hello, >>> >>> I would like to use the multi_array container to handle imaging data. The >>> image data can be anything up to 8-dimensional (usually up to 4) and >>> dimension information is found in records that accompany the binary data. >>> >>> Would it be possible to create an image class that takes the >>> dimensionality and extents list as parameters, so that images of all >>> dimensionalities can be treated as one class? >>> >>> For example, could the dimensionality be passed as a size_t argument? >>> >>> What I understand from the multi_array paper is that the extents list >>> would only be required whan the array is initialised. >>> > > You could always just wrap up each of the possible dimensions in a > struct that can handle the (de)serialization and everything too, > perhaps use crtp to put identical functionality in a non-virtual base > class. >

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[Boost.Test] Controlling Windows debug trace output
by Alexander Lamaison 08 Aug '09

08 Aug '09

I've recently noticed the Boost.Test outputs anything output using the Windows debug trace functions such as ATLTRACE. Thanks for this! This makes these trace functions so much more useful. However, I was wondering if there was some way to control this output. Ideally, I don't want my automoated test runs to output all these tracelines. Is there a flag to the test runnner that will turn them of? Many thanks. Alex Lamaison

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