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Re: [Boost-users] [Statechart] Passing Arguments in the Events Concept
by Babi Seal 30 Sep '08

30 Sep '08

Thanks for your prompt response. Yes it works really well. ----- Original Message ---- From: Andreas Huber <ahd6974-spamboostorgtrap(a)yahoo.com> To: boost-users(a)lists.boost.org Sent: Tuesday, September 30, 2008 1:08:24 PM Subject: Re: [Boost-users] [Statechart] Passing Arguments in the Events Concept Hi > I have been researching the Boost archives, Tutorials, > examples and I do find references to the fact that it is > possible to provide arguments along with Events that a > custom_reaction (in self-transition) can selectively > "react" on based on the value of the argument but > I am unable to articulate it using the Boost Statechart > library. I just realized that there is not a single example on how to pass arguments with events. It's very easy to do, though: struct EvWhatever : sc::event< EvWhatever > { int Arg1; double Arg2; // More arguments here }; You might want to add a constructor that accepts corresponding arguments and sets the data members Arg1 & Arg2 accordingly. You can access Arg1 & Arg2 in the react member function, in a transition action or the function called by an in_state_reaction. Hope this helps. if not, please let me know. Regards, -- Andreas Huber

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asio async_accept
by Etienne Philip Pretorius 30 Sep '08

30 Sep '08

Just a quick question about the async_accept() in acceptor. Must the accept_handler be declared as a static member function within my class? The online examples do not seem to do this at all, and if I try it without the static keyword on my private member function then the compiler complains about it not matching the signature. Etienne Pretorius

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[Proto] Evaluating non-trivial expression
by Joel Falcou 30 Sep '08

30 Sep '08

Let's say I have grammar etc.. for writing algebra code like : a = b+c, u = x + y, z = 3*e; and have each sub expression containing a = call to be evaluated on a different processor. Where can I put the evaluation call using the context ? In the destructor of my associated expression ?

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[Phoenix] review reminder
by Hartmut Kaiser 30 Sep '08

30 Sep '08

All, this is just a gentle reminder for all of you willing and planning to write a review for Joel de Guzman's and Dan Marsden's library Phoenix V2. The review ends tomorrow, September 30th. If you are for some reason not able to write the review before tomorrow night, please get in contact with me directly, so we can work something out. Regards Hartmut Review Manager

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Re: [Boost-users] [Statechart] Passing Arguments in the Events Concept
by Andreas Huber 30 Sep '08

30 Sep '08

Hi > I have been researching the Boost archives, Tutorials, > examples and I do find references to the fact that it is > possible to provide arguments along with Events that a > custom_reaction (in self-transition) can selectively > "react" on based on the value of the argument but > I am unable to articulate it using the Boost Statechart > library. I just realized that there is not a single example on how to pass arguments with events. It's very easy to do, though: struct EvWhatever : sc::event< EvWhatever > { int Arg1; double Arg2; // More arguments here }; You might want to add a constructor that accepts corresponding arguments and sets the data members Arg1 & Arg2 accordingly. You can access Arg1 & Arg2 in the react member function, in a transition action or the function called by an in_state_reaction. Hope this helps. if not, please let me know. Regards, -- Andreas Huber When replying by private email, please remove the words spam and trap from the address shown in the header.

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Boost, MSVC 8 and StlPort
by Alex Oren 30 Sep '08

30 Sep '08

Hello, I installed Boost via the BoostPro 1.36.0 Installer and trying to use the Regex package. Unfortunately, it does not want to link. I am using MSVC 8 (Visual Studio 2005) with StlPort instead of the native libraries. Boost tries to link libboost_regex-vc80-mt-gdp-1_36.lib which is not included in the distribution. I have bjam but I don't know what parameters to use so I couldn't build the debug library. Please help! Thank you, Alex.

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[DateTime]: unexpected boost::local_time::bad_offset caught
by Roland Bock 30 Sep '08

30 Sep '08

Hi, I stumbled over an inconsistency in the Boost::DateTime library. I wanted to create a STL map of posix time zones. For this purpose, I wrote a mini code generator: ---------------------------------------------------- tz_database tz_db; tz_db.load_from_file("src/date_time_zonespec.csv"); vector<string> names = tz_db.region_list(); for (vector<string>::iterator it = names.begin(); it != names.end(); ++it) cout << " timeZones.insert(pair<string, time_zone_ptr>(\"" << *it << "\", " << "time_zone_ptr(new posix_time_zone(\"" << tz_db.time_zone_from_region(*it)->to_posix_string() << "\"))));" << endl; ---------------------------------------------------- (Sorry for the bad formatting) This created lines like the following: ---------------------------------------------------- timeZones.insert(pair<string, time_zone_ptr>("America/New_York", time_zone_ptr(new posix_time_zone("EST-05EDT+01,M3.2.0/02:00,M11.1.0/02:00")))); [...] timeZones.insert(pair<string, time_zone_ptr>("Pacific/Kiritimati", time_zone_ptr(new posix_time_zone("LINT+14")))); ---------------------------------------------------- The latter (and three others) throws an instance of boost::local_time::bad_offset. Thus, I have posix four time zones from the date_time_zone_spec.csv which can be written to a posix string, but the resulting string cannot be used to create a new posix time zone. Its certainly not critical for me. I currently have no need to use Pacific time zones, but it looks like an error anyway. Regards, Roland

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Some design details about boost::asio timer ?
by Kartik Mahajan 30 Sep '08

30 Sep '08

Hi I am implementing an asynchronous timer, would like to build it similar to the one included in the asio library. I am using a timer wheel implementation i.e a fixed size array of double linked lists. The timer wheel implementation is quite efficient as insertion is O(1), deletion of timer is O(1) and firing of timer is also O(1). The only drawback is that the time registered should not be greater than the size of 1 rotation of the wheel. typedef list<Timer> ListOfTimers ListOfTimers myTimerobj(10000) ( with 100 ticks per second this would give an accuracy of 10ms ) The thread in the timer delegates the execution of the callbacks to another thread ( take from a thread pool ). >From what I have read from the code of timer in asio library, I guess its implemented as a heap. But in a heap data structure (implemented as vector ), insertion and deletion would be O(lg n) I would like to know the reason to use heap. This is purely for educational purpose so that I can understand the design rationale. Also I would like to know that would boost::asio asynchronous timer be efficient for say 200000 timers firing at the same time ? I also wish to implement a timer similar to one in boost::asio, purely for knowledge. I need this in my application in which I would thousands of timers firing at the same time. Can someone provide some design details of boost::asio timer implementation so that I can build a timer similar to that. ( It would make it easy for me to read the code provided by boost::asio if I know the design rationale) Please don't get offended if you find the above post irrelevant in this mailing list :-) Here is the very simple interface I am implementing. Here is the API I wish to implement( I would like to see comments on what else should be the public interface of such a class ) TimerHandle registerTimer(period,callBackFunctor) void cancelTimer(TimerHandle) int timeElapsed(TimerHandle) int timeLeft(TimerHandle) Thanks & Regards Kartik Mahajan

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libboost_filesystem on AIX-5.3 with gcc-4.3.1: IOT/Abort trap (core dumped)
by Mathieu Gontier 30 Sep '08

30 Sep '08

Hello, I am trying to build libboost_filesystem.a on AIX-5.3 with gcc-4.3.1. The compilation goes right but unfortunately, I have the following error at the runtime (and a core file): "IOT/Abort trap (core dumped)" When I remove this library from my tiny example, my binary works; when I link against libboost_filesystem.a (even if functions are never called), it crashes. I tried a lot of options found on the web without success. Maybe someone her will be able to help me of guide me. Here the compilation of libboost_filesystem.a: ========== libboost_filesystem.a [begin] ========== ( cd libs/filesystem/src ; make ) g++ -fPIC -pthread -g -maix64 -Wall -Wno-inline -finline-functions -mcpu=power5+ -ftemplate-depth-100 -O0 -DBOOST_ALL_NO_LIB -DBOOST_LIB_DIAGNOSTIC -DBOOST_UBLAS_ENABLE_PROXY_SHORTCUTS -DBOOST_UBLAS_INLINE=inline -D_THREAD_SAFE -DFFT_BUILDSYSTEM_GENERATOR -DNDEBUG -I../../.. -c exception.cpp -o exception.o g++ -fPIC -pthread -g -maix64 -Wall -Wno-inline -finline-functions -mcpu=power5+ -ftemplate-depth-100 -O0 -DBOOST_ALL_NO_LIB -DBOOST_LIB_DIAGNOSTIC -DBOOST_UBLAS_ENABLE_PROXY_SHORTCUTS -DBOOST_UBLAS_INLINE=inline -D_THREAD_SAFE -DFFT_BUILDSYSTEM_GENERATOR -DNDEBUG -I../../.. -c path.cpp -o path.o g++ -fPIC -pthread -g -maix64 -Wall -Wno-inline -finline-functions -mcpu=power5+ -ftemplate-depth-100 -O0 -DBOOST_ALL_NO_LIB -DBOOST_LIB_DIAGNOSTIC -DBOOST_UBLAS_ENABLE_PROXY_SHORTCUTS -DBOOST_UBLAS_INLINE=inline -D_THREAD_SAFE -DFFT_BUILDSYSTEM_GENERATOR -DNDEBUG -I../../.. -c utf8_codecvt_facet.cpp -o utf8_codecvt_facet.o g++ -fPIC -pthread -g -maix64 -Wall -Wno-inline -finline-functions -mcpu=power5+ -ftemplate-depth-100 -O0 -DBOOST_ALL_NO_LIB -DBOOST_LIB_DIAGNOSTIC -DBOOST_UBLAS_ENABLE_PROXY_SHORTCUTS -DBOOST_UBLAS_INLINE=inline -D_THREAD_SAFE -DFFT_BUILDSYSTEM_GENERATOR -DNDEBUG -I../../.. -c operations.cpp -o operations.o g++ -fPIC -pthread -g -maix64 -Wall -Wno-inline -finline-functions -mcpu=power5+ -ftemplate-depth-100 -O0 -DBOOST_ALL_NO_LIB -DBOOST_LIB_DIAGNOSTIC -DBOOST_UBLAS_ENABLE_PROXY_SHORTCUTS -DBOOST_UBLAS_INLINE=inline -D_THREAD_SAFE -DFFT_BUILDSYSTEM_GENERATOR -DNDEBUG -I../../.. -c portability.cpp -o portability.o ar -X64 rv ../../../libboost_filesystem.a exception.o path.o utf8_codecvt_facet.o operations.o portability.o ar: Creating an archive file ../../../libboost_filesystem.a. a - exception.o a - path.o a - utf8_codecvt_facet.o a - operations.o a - portability.o ( cd libs/system/src ; make ) g++ -fPIC -pthread -g -maix64 -Wall -Wno-inline -finline-functions -mcpu=power5+ -ftemplate-depth-100 -O0 -DBOOST_ALL_NO_LIB -DBOOST_LIB_DIAGNOSTIC -DBOOST_UBLAS_ENABLE_PROXY_SHORTCUTS -DBOOST_UBLAS_INLINE=inline -D_THREAD_SAFE -DFFT_BUILDSYSTEM_GENERATOR -DNDEBUG -I../../.. -c error_code.cpp ar -X64 rv ../../../libboost_system.a error_code.o ar: Creating an archive file ../../../libboost_system.a. a - error_code.o ========== libboost_filesystem.a [end] ========== Here the compilation of my tiny test case (named "foo"): ========== foo [begin] ========== g++ -pthread -g -maix64 -Wall -Wno-inline -finline-functions -mcpu=power5+ -ftemplate-depth-100 -O0 -I/usr/local/myfft/bin/boost-1.35 -I/home/qa/mysvntop/femtown/applications -I/home/qa/mysvntop/femtown/modules -D_THREAD_SAFE -DBOOST_UBLAS_INLINE=inline -DBOOST_UBLAS_ENABLE_PROXY_SHORTCUTS -DBOOST_LIB_DIAGNOSTIC -DBOOST_ALL_NO_LIB -DNDEBUG -DFFT_BUILDSYSTEM_GENERATOR -I/usr/lpp/ppe.poe/include -I/usr/lpp/ppe.poe/include -DIBMGCC -c main.cpp -o /home/qa/MG/dotop/femtown/products/foo/release/main.o g++ /home/qa/MG/dotop/femtown/products/foo/release/main.o -lboost_filesystem -lboost_system -lfake_mpi_fake_mpi -pthread -g -maix64 -lm -lc -L/usr/vac/lib -lxlopt -lxl -mcpu=power5+ -Wl,-bmaxdata:0xFFFFFFFFFF/dsa -Wl,-b64 -L/home/qa/MG/actrantop//actran_current/libs -L/home/qa/MG/actrantop//actran_current/foo/lib -lstdc++ -lgcc_s -o ./bin/foo ========== foo [end] ========== I ran my binary through dbx in order to explore the core file. Here, the beginning of what dbx returned (I can send the complete trace if someone ask for it): ========== dbx ./bin/foo [begin] ========== Type 'help' for help. reading symbolic information ...internal error: 1283-232 index("16;0;", ':') failed internal error: 1283-232 index("16;0;", ':') failed internal error: 1283-232 index("8;0;", ':') failed internal error: unexpected value 120 at line 5113 in file stabstring.c internal error: unexpected value 120 at line 5113 in file stabstring.c internal error: 1283-231 bad input on tag "._0" at "t70=s16quot:50,0,64;rem:50,64,64;;" internal error: 1283-228 expected char '=', found 't70=s16quot:50,0,64;rem:50,64,64;;' internal error: 1283-231 bad input on tag "sigset_t" at "t158=s32ss_set:159=ar2;0;03;-32,0,256;;" internal error: 1283-228 expected char '=', found 't158=s32ss_set:159=ar2;0;03;-32,0,256;;' internal error: 1283-231 bad input on tag "._1" at "t161=s8losigs:-8,0,32;hisigs:-8,32,32;;" internal error: 1283-228 expected char '=', found 't161=s8losigs:-8,0,32;hisigs:-8,32,32;;' internal error: 1283-231 bad input on tag "._2" at "t162=s32ss_set:163=ar2;0;03;49,0,256;;" internal error: 1283-228 expected char '=', found 't162=s32ss_set:163=ar2;0;03;49,0,256;;' internal error: 1283-231 bad input on tag "fsid_t" at "t165=s8val:166=ar2;0;01;-8,0,64;;" internal error: 1283-228 expected char '=', found 't165=s8val:166=ar2;0;01;-8,0,64;;' internal error: 1283-231 bad input on tag "fsid64_t" at "t168=s16val:169=ar2;0;01;49,0,128;;" internal error: 1283-228 expected char '=', found 't168=s16val:169=ar2;0;01;49,0,128;;' internal error: 1283-231 bad input on tag "._3" at "t179=s64__mt_word:180=ar2;0;07;-31,0,512;;" [...] ========== dbx ./bin/foo [end] ========== Many thank in advance to those who will spent time on this difficult problem. Regards, -- Mathieu Gontier Core Development Engineer -- Free Field Technologies Axis Park Louvain-la-Neuve rue Emile Francqui, 1 B-1435 Mont-Saint Guibert - BELGIUM Company Phone: +32 10 45 12 26 Company Fax: +32 10 45 46 26 Direct Phone: +32 10 49 51 41 Mobile Phone: +32 477 61 72 52 http://www.fft.be

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[Phoenix] Review: Documentation
by Roland Bock 30 Sep '08

30 Sep '08

Hi, regarding the Phoenix documentation: I'm afraid you lost me not too far from the beginning, and I would like to remark a few things: Details: ======== I am missing details and/or background, maybe even just a sentence or two more, here and there. I assume that for library designers and FP experts most of the things are crystal clear anyways. But for laymen like me, some things are pretty obscure. For example, the actor's page. It says that it is the main concept and it shows a template and with one parameter, which does not appear anywhere near the template's body. And that's pretty much it. It does not say anything about when it is used, by whom, or what the necessary characteristics of the template argument "Eval" are. Nothing. Except: "Don't worry about the details, for now." Sorry, but you lost me there. I do not have the lightest idea of what an actor is all about after reading this page. This certainly leaves a bad feeling, because the one clear statement on the page is "The Actor is the main concept behind the library." Not to worry about details would normally help to focus on the important stuff, the central concept, the main thought. But in this case? I am just being told that the actor is in fact the main concept. I don't know if all the gory details are required on that page, maybe there are too many details already (the template's code). I cannot tell. But I know that the concepts/ideas for this thing need to be explained before going on. In contrast to a crime story, I would prefer to know the plot before going on. When meeting one of the main characters, I do not want to get to know him along with the story. No, I would learn about the characteristics right away and decide whether I want to spend more time reading about him (or using him in one of my projects). I cannot really tell if the following things are documented in enough detail, since I guess I need to understand the concept of the actor. I am afraid, though, that I would require a few more sentences, here and there, or maybe just a few more examples. Examples: ========= IMHO, most examples are either too simple or too abstract. For example: The "real world example" from the starter kit is not really a real world example, it is too simple. So don't throw it away, but add something a little bit more complex. For instance, you could combine it with one from the composite page (which is pretty abstract in my eyes and does not tell me anything): /////////////// struct A { int member; }; A* a = new A; ... (arg1->*&A::member)(a); // returns member a->member /////////////// You could use this in the "real world example". Replace vector<int> by vector<A> and then find objects with object.member%2==1. I assume that would help me. Regards, Roland

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