September 2008 - Boost-users

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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[logging]Logging from an exe and dll's
by Vladimir Kiryazev 30 Sep '08

30 Sep '08

Hi, I am still using the logging library by John Torjo. My program consist of an exe and several dll's. I need to log from within each of these. How does one do this? TIA.

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bjam?
by Peter H. Hodges 29 Sep '08

29 Sep '08

I will be using an Intel C++ compiler. What version of bjam should I download? Peter Hodges TBU 309-494-3457

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regex vc8-stlport.mak missing in 1.33?
by Rob Maidment 29 Sep '08

29 Sep '08

I'm upgrading from 1_33_1 to 1_36_0 (windows) and I've noticed that vc8-stlport.mak is missing from the libs\regex\build folder. Is this intentional? If so, how do I go about building for VC8 and stlport? My previous build script ran bjam with the option "-sTOOLS=vc-8_0-stlport". This now results in the warning: "no toolsets are configured". Does this relate to the above missing file? Thanks, Rob CUSTOMER TESTIMONIAL OF THE WEEK ---------------------------------------------------------------- Tomaž Gorjup, CIO, Studio Moderna d.o.o., Ljubljana, Slovenien: “We had been looking for an anti-spam solution that would effectively protect us from flooding spam, globally and selectively using various criteria. MIMEsweeper fulfilled all our expectations with additional security layer and effective email traffic analysis.” ---------------------------------------------------------------- Do your defenses have what it takes? Prove it. ... try the Clearswift Threat Test today! – www.clearswift.com/threattest Clearswift monitors, controls and protects all its messaging traffic in compliance with its corporate email policy using Clearswift products. Find out more about Clearswift, its solutions and services at http://www.clearswift.com This communication is confidential and may contain privileged information intended solely for the named addressee(s). It may not be used or disclosed except for the purpose for which it has been sent. If you are not the intended recipient, you must not copy, distribute or take any action in reliance on it. Unless expressly stated, opinions in this message are those of the individual sender and not of Clearswift. If you have received this communication in error, please notify Clearswift by emailing support(a)clearswift.com quoting the sender and delete the message and any attached documents. Clearswift accepts no liability or responsibility for any onward transmission or use of emails and attachments having left the Clearswift domain. This footnote confirms that this email message has been swept by MIMEsweeper for Content Security threats, including computer viruses.

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[Thread][win32, msvc] Mutexes
by Alexander Gutenev 29 Sep '08

29 Sep '08

Hi I consider changing from win32 CRITICAL_SECTIONs to Boost.Thread mutexes. boost::mutex isn't CRITICAL_SECTION, but boost::detail::lightweight_mutex is. Does this mean that boost::mutex is heavy-weight ? If so, what's the reason for heavy-weight implementation which has the same capabilities that lightweight CRITICAL_SECTION has ? If not so, what's the reason for boost::detail::lightweight_mutex to exist ? Thanks.

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Boost Serlialization on XScale problem
by lee nookx 29 Sep '08

29 Sep '08

Hi, I am having a strange problem with the Boost Serilalizartion library on an XScale platform. I am using v1.34.1 of the libraries and I'm seeing segfaults when creating an archive object, but only under some circumstances. The problem occurs in several different projects, but I've been able to reproduce it using the most simple case from the tutorial (http://www.boost.org/doc/libs/1_36_0/libs/serialization/doc/index.html) The problem that I see is that the code segfaults at these lines, and a core dump shows this error is occuring down on malloc_trim(): std::ifstream ifs("filename"); boost::archive::text_iarchive ia(ifs); // <--- causes a segfault. However, if I move the "std::ifstream ifs("filename");" further up the code (next to the initialisation of the ofs object, then the code works fine. Has anyone else seen any problems like this before? We have been using Boost::Thread, and Boost::Date-Time without any problems for a while, so I believe that this may just be a serialization library problem. I am also going to give v1.36.0 a try to see if it's something subtle that's been fixed already. (I have a core dump that I can make available if anyone needs it....) --lee --

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