- Boost - lists.boost.org

No auto-link for filesystem
by Martin Slater 07 Dec '04

07 Dec '04

Is there a reason for this or is it just an oversight? cheers Martin

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[BUG] Missing method in gregorian::greg_year
by Joel Reed 07 Dec '04

07 Dec '04

the class gregorian::greg_year in the date_time library is missing a method implemented in greg_day and greg_month. the method is: unsigned short as_number() const {return value_;} i checked cvs, on 12/6/04, to confirm this is still an issue. http://cvs.sourceforge.net/viewcvs.py/boost/boost/boost/date_time/gregorian… we have been very impressed with this library and wanted to report this minor inconsistency as a small, small way to say thanks. jr -- ------------------------------------------------------------ Joel W. Reed 412-257-3881 ---------- http://home.comcast.net/~joelwreed/ ----------

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Boost Sandbox layout?
by Rene Rivera 06 Dec '04

06 Dec '04

I'm looking at how things are placed in the sandbox and wondering about something... Currently the sandbox mirrors the layout of the main Boost CVS. That is: boost-sandbox /boost/... /libs /libs/<library>/... That layout has a few drawbacks when dealing with a single isolated library... 1) It makes it harder to package as one has to filter out the rest of the stuff there. 2) One can get conflicts when something in another library's code gets accidentally used. I ran into this when evaluating named_params as some MPL related files got picked off from the sandbox instead of from the Boost CVS. 3) Makes finding things much harder when someone mentions to look in the sandbox for their library. Was there ever a discussion as to the layout? (A cursory search did not reveal anything) -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com - 102708583/icq

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Bug: thread_exception returns ref to local variable
by Ulrich Eckhardt 06 Dec '04

06 Dec '04

Cheers! The code in question is this: // boost/thread/exceptions.hpp class thread_exception { ... const char* message() const; }; // libs/thread/src/exceptions.cpp std::string system_message(int sys_err_code){..} const char* thread_exception::message() const { if (m_sys_err != 0) return system_message(m_sys_err).c_str(); return what(); } If message() is called and m_sys_err is set, it will return a pointer to storage of a temporary, which is bad, as we all know. I did some research on that, and I think this whole method can be removed completely because: - it is not decumented - it is not used - it never worked (probably, at least not with 1.32) Further, one could then remove <string> from the includes in the header and some more includes in the sourcefile. An alternative approach would be to change the returntype to std::string, of course, or (and I think that's an interesting alternative!) derive all those classes from std::runtime_error, which can hold a std::string natively. Uli

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wiki spam
by Max Khesin 06 Dec '04

06 Dec '04

The CAPTCHA technology might be helpful: http://weblog.infoworld.com/udell/2004/12/01.html#a1124 There are apparently open-source implementations of CAPTCHA, might be something to consider. Another suggestion would be boost-specific CAPTCHA that asks you to enter a result of some enable_if statement as the answer to the question - guaranteed to stop spammers AND newbies! (an unexpected benefit?) regards, max This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail.

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Novelty: autmatically assigning unique integral type ids
by Jonathan Turkanis 06 Dec '04

06 Dec '04

Hi all, Attached is some non-conforming code which automatically assigns a unique integer id to an arbitrary type. It's based on this post by Daniel Wallin: http://lists.boost.org/MailArchives/boost/msg69842.php Example: #include <boost/static_assert.hpp> #include <boost/unique_id.hpp> int main() { BOOST_STATIC_ASSERT(BOOST_UNIQUE_ID(void) == 0); BOOST_STATIC_ASSERT(BOOST_UNIQUE_ID(bool) == 1); BOOST_STATIC_ASSERT(BOOST_UNIQUE_ID(char) == 2); BOOST_STATIC_ASSERT(BOOST_UNIQUE_ID(void) == 0); BOOST_STATIC_ASSERT(BOOST_UNIQUE_ID(bool) == 1); BOOST_STATIC_ASSERT(BOOST_UNIQUE_ID(char) == 2); } Obviously the ids assigned will be different depending on the order in which types are passed to BOOST_UNIQUE_ID. It's a novelty not just because it's non-conforming but also because after assigning ids to about fifty types it slows down to a deadly crawl, and maxes out at about 110 types (on VC7.1, using over 300MB RAM). I tried several forms of loop unrolling, and they don't help much. I'm posting this now because yesterday I figured out how to make it work on EDG (except for Comeau). It now works on VC7.1, VC8.0 (beta), GCC 3.2 (MinGW), GCC 3.4.1 (Cygwin), Intel 7.0 and 8.0 for Windows (in strict mode), and on the preview of the Borland EDG-based compiler I downloaded about half a year ago. I still need conforming-compiler workarounds for Comeau and Metrowerks. ;-) Best Regards, Jonathan begin 666 unique_id.zip M4$L#! H``````'%R@S$````````````````/````;&EB<R]U;FEQ=65?:60O M4$L#!!0````(`!AP@S&5>-46[ ```+(&```7````;&EB<R]U;FEQ=65?:60O M=&5S="YC<'#MTT]/PC 8!O![DWZ')ERV"SB4?T%,4#GL`M&-<U/6RIJ4%M?6 MB_&[.SM%PHEW5^AQW2_/F_1Y.U(7RG-![C?&6->SCCE94&:MJ%RWW.\?,.J< M_..U?/>"2OY[CY'4CNR8U%&,T2=&I#Z/JU66TRR?Y^D3G6?9XC6/FF_K9?JR M7M#T.?HPDL=D-B,W\?1\50^A@DH@JBA9%50?HJS<:L')`=]"L->G_ Z479K* M!39HE?KOAQ!?OV5 HU:A?WH,T<KH;5"35ID'GH!Z]*8,:X9-0$WBQF^4:""H M3#]SDF,-:M-U6:[+<O'+\H71-U!+`P0*``````"<<H,Q```````````````` M!0```&QI8G,O4$L#!!0````(`$-O@S'*X)&D;@,``*,+```3````8F]O<W0O M=6YI<75E7VED+FAP<*5638^;,!"]K[3_8:1>8)M"4O7D4J0V&ZFI*K95V%XM M+PR)56*H,=VF5?][;2"$+!\;J3XA_&;FS;-G/*X+UM*&998?)-_N%'S*!%,[ M)B LY7<F> &OY_,WSO65Z\(M+Y3D#Z7"&$H1HP2U0_B0986"39:H1R81/O,( M18$S^(:RX)F A3-WP-H@`HNB;)\S<>!B6SE,>*H-ULM5L%G1!9T[ZI>"3$*D MZ0!3L%,J)Z[[^/CH/)@H3B:W[A.\8U]?'=E%*>-[E 2"3 %KF*7\03)Y< SL M!4\T[P0^W-UM0GH?K+_>K^CZEG[\\H6N@^7G^]O5K49I"!?X#,IX$U%:Q@A> MQ<Z-,I'PK;/+<[^_N<]3%W^RE/)D`L%C%(JKPQ1$J(G=G'$YLJT..5(E&5>% M&Z-B/'4/6%"14;-S@1$OZ,^,QR/(4O%4,W=1L(<43VF.ZFF%-A!2&1-2"OZC MU%:Q!R'XA)BXA&B]2C0N!-MCD;,(H<+#G_.?=3KF+_37]95"+0U3Z!FOQ@I" MMM74.LD1TN(a)`+1.ZPS1':6GL#!S'L=^:H .^M"==&&6D.K9<HXY\!L//0!\D M!'X-:>WW3'[7Y=7)I%9M$[X/UTNZO OT5Q!:1H=T!I5 \.X\[X+_QBRQAA*Q M[!E8F(a)TA.CKU`O_&GMMV7[9WPRZ'!+/!"',$FC^FPJH8AB/U*HY^M=,`_U9* M5O">-/<S:+^?J"/PEZ)#$AV#'@W[^51TFO+S!F])J[UWDF?NSR!H;J$_&S:K MT4W9CKAN<:8Z)S MKCZ<)C+<P.NQZ'VKN3^.'-F:3&U:-+,&A%M<()Q9EXK7 M8B\0L,7V1(27L'A.R'/KQ8289DUI?7':IJ>.G4S_=],;06)1IFJ@\OZK")H6 M[]7>QW(X*T3/E.R X$;LZ:O5*M!$&T]VN'<\2?@IK;!+:^ZWSLZEZWFI=PE) MN-0/S?CJ<!KU4:">">()'VS[]MCBF.*1GGR$#FI>AJ:S0^<AG.B:]7M6.ZIZ M98QZ&))($\E1##9+$Z23@UD-^*S+FQ&ADNT$&WXA3UI;-?=7AE5#W79U#[NQ MGS_#<]Z>%J@]MK/%M4Y,WQZF,JF]U1[_@IX#5SH#XRHO3I.!<_G+7?,BG71J M%YT1I7K<O= _-KC:Y \,D*C&DZ(>6NH)5&?%$P.Y;!:]OOH'4$L#! H````` M`)ER@S$````````````````&````8F]O<W0O4$L!`A0`"@``````<7*#,0`` M``````````````\````````````0`````````&QI8G,O=6YI<75E7VED+U!+ M`0(4`!0````(`!AP@S&5>-46[ ```+(&```7``````````$`( ```"T```!L M:6)S+W5N:7%U95]I9"]T97-T+F-P<%!+`0(4``H``````)QR@S$````````` M```````%````````````$ ```$X!``!L:6)S+U!+`0(4`!0````(`$-O@S'* MX)&D;@,``*,+```3``````````$`( ```'$!``!B;V]S="]U;FEQ=65?:60N M:'!P4$L!`A0`"@``````F7*#,0````````````````8````````````0```` @$ 4``&)O;W-T+U!+!08`````!0`%`"H!```T!0`````` ` end

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[thread] SunPRO: test_mutex hangs when run via regression.py
by Caleb Epstein 06 Dec '04

06 Dec '04

The Boost.Threads test program test_mutex, when built with the SunPRO C++ compiler, always hangs when I run it on a Solaris machine under regression.py. The same binary finishes in short order with status 0 when run on the command line, but under regression.py it never exits. If I attach to it with the debugger, or with strace or truss, it finishes successfully. I'm unclear what could be going wrong here and expect it is either a bug in the code produced by SunPRO or a really subtle bug in the test program. Perhaps someone could take a look? I am stumped. Here's the output of a program I found called "thrstack" which produces a stack trace for each thread w/o attaching to it: status for pid 13551 (6 LWPs) -- LWP 1 -- ff19f48c: libc.so.1:__lwp_sema_wait + 0x8 ff2396dc: libthread.so.1:_park + 0x114 ff2393a4: libthread.so.1:_swtch + 0x424 ff23da10: libthread.so.1:_reap_wait_cancel + 0x40 ff23fc9c: libthread.so.1:_thrp_join + 0x344 ff33d0d8: libboost_thread-sw-mt-d-1_32.so:void boost::thread::join() + 0x18 000334a4: test_mutex:void __unnamed_lpburfiEtB2zM::indirect_adapter<void(*)()>::operator()()const + 0x44 000333b4: test_mutex:boost::detail::function::unusable boost::detail::function::void_function_obj_invoker0<__unnamed_lpburfiEtB2zM::indirect_adapter<void(*)()>,void>::invoke(boost::detail::function::any_pointer) + 0x1c ff330748: libboost_thread-sw-mt-d-1_32.so:void boost::function0<void,int>::operator()()const + 0x78 ff33cd4c: libboost_thread-sw-mt-d-1_32.so:thread_proxy + 0x44 ff24b01c: libthread.so.1:_thread_start + 0x40 ff33cd08: libboost_thread-sw-mt-d-1_32.so:thread_proxy + 0x0 -- LWP 2 -- ff19eddc: libc.so.1:__signotifywait + 0x4 ff23e950: libthread.so.1:_dynamiclwps + 0x1c ff241c2c: libthread.so.1:_thr_yield + 0x8c -- LWP 3 -- ff19f48c: libc.so.1:__lwp_sema_wait + 0x8 ff2396dc: libthread.so.1:_park + 0x114 ff2393a4: libthread.so.1:_swtch + 0x424 ff23ada0: libthread.so.1:_mutex_adaptive_lock + 0x160 ff23aab4: libthread.so.1:_cmutex_lock + 0x84 ff141cd0: libc.so.1:malloc + 0x18 ff136174: libc.so.1:calloc + 0x54 ff243e2c: libthread.so.1:_thr_setspecific + 0x38 ff2e54bc: libCrun.so.1:__Cimpl::ex_thread*__Cimpl::ex_thread::get_thr_data() + 0x118 ff2e4160: libCrun.so.1:__Cimpl::xstack*&__Cimpl::get_cur_xptr() + 0x4 ff2e41b0: libCrun.so.1:void*__Crun::ex_alloc(unsigned) + 0x14 0007c338: test_mutex:int boost::detail::catch_signals(boost::execution_monitor&,bool,int) + 0x310 0007ac38: test_mutex:int boost::execution_monitor::execute(bool,int) + 0x28 00076e40: test_mutex:boost::unit_test::ut_detail::unit_test_monitor::error_level boost::unit_test::ut_detail::unit_test_monitor::execute_and_translate(boost::unit_test::test_case*,void(boost::unit_test::test_case::*)(),int) + 0x60 0005c1b0: test_mutex:void boost::unit_test::test_case::run() + 0x498 0005cbc4: test_mutex:void boost::unit_test::test_suite::do_run() + 0x7c 0005c3e0: test_mutex:void boost::unit_test::test_case::run() + 0x6c8 00062208: test_mutex:main + 0x458 0002cbb0: test_mutex:_start + 0x108 -- LWP 4 -- ff19f48c: libc.so.1:__lwp_sema_wait + 0x8 ff2396dc: libthread.so.1:_park + 0x114 ff2393a4: libthread.so.1:_swtch + 0x424 ff23ada0: libthread.so.1:_mutex_adaptive_lock + 0x160 ff23aab4: libthread.so.1:_cmutex_lock + 0x84 ff142b64: libc.so.1:free + 0x18 ff2e6260: libCrun.so.1:void operator delete(void*) + 0x4 00031c24: test_mutex:__SLIP.DELETER__H + 0x2c 00031ba0: test_mutex:void boost::detail::sp_counted_base::destruct() + 0x40 00030a5c: test_mutex:void boost::detail::sp_counted_base::weak_release() + 0x6c 0002f9cc: test_mutex:void boost::detail::sp_counted_base::release() + 0x8c 0002f6ec: test_mutex:boost::detail::shared_count::~shared_count #Nvariant 1() + 0x24 0002ef58: test_mutex:boost::shared_ptr<boost::basic_wrap_stringstream<char> >::~shared_ptr() + 0x10 0002e540: test_mutex:boost::test_tools::extended_predicate_value::~extended_predicate_value() + 0x10 0002e2dc: test_mutex:bool boost::test_tools::tt_detail::equal_and_continue_impl<int,int>(const __type_0&,const __type_1&,boost::basic_wrap_stringstream<char>&,boost::unit_test::basic_cstring<const char>,unsigned,boost::unit_test::log_level,unsigned) + 0x37c 0002d6ac: test_mutex:boost::xtime __unnamed_lpburfiEtB2zM::delay(int,int,int) + 0x10c 0002d110: test_mutex:bool __unnamed_lpburfiEtB2zM::execution_monitor::wait() + 0x20 ff25c000: libthread.so.1:?? + 0x0 -- LWP 5 -- ff2491fc: libthread.so.1:private___lwp_cond_wait + 0x4 ff238998: libthread.so.1:_co_timerset + 0xa0 ff24b01c: libthread.so.1:_thread_start + 0x40 ff2388f8: libthread.so.1:_co_timerset + 0x0 -- LWP 6 -- ff19c980: libc.so.1:__door_return + 0xc ff2467c8: libthread.so.1:_sc_door_func + 0x54 ff23a358: libthread.so.1:_lwp_start + 0x18 ff241c2c: libthread.so.1:_thr_yield + 0x8c -- Caleb Epstein caleb dot epstein at gmail dot com

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variant==dependent pair, dependent function possible?
by Larry Evans 06 Dec '04

06 Dec '04

IIUC, the variant library is similar to a "dependent product" which can be thought of as a pseudo_pair<Index,TypeList>. where an instance: pseudo_pair<I,T> dpIT; is a pair of values (i,t) where: I i; T<i> t; IOW, there is only one value, but it can be one of many types depending on the valid values of I. BTW, would variant be made for readable by making variant take an enumeration: enum I{i0, i1, ...., in-1} as the discriminator? Anyway, back to the original question. Is there any interest in a "dependent function" where: dependent_function<I,T> df; where: T<i0>& df<i0>(); T<i1>& df<i1>(); ... T<in-1>& df<in-1>(): IOW, this would be like a regular struct (a record type), however, instead of: df.ix there would be: df<ix>(); BTW, this idea comes from Nuprl: http://www.cs.cornell.edu/Info/Projects/NuPrl/nuprl.html and I've recently had a need for it because I've got a template which is specialized on an enumeration; hence, this would come in handy if I wanted to have a structure containing all instances of the specializations.

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Unexpected behaviour of boost::filesystem::equivalent
by Daniel Krügler 06 Dec '04

06 Dec '04

Hi booster, its quite a long time ago since I could follow the threads here more thoroughly :-( , so the following information might not be new one. During tests of the current Win32 implementation of boost::filesystem::equivalent I observed that the function unexpectingly fails (my test environment was Win XP SP 1 with MSVC7.1) if it compares a "soft link" created via the DOS command "subst" (or its API analogon ::DefineDosDeviceA/W) with the corresponding mapped path object (Lets say I map M: to the existing directory C:\temp). To get an understanding of the test failure I debugged the implementation and found that actually the first test part (getting the handles and comparing the VSN's + further data) gave the expected positive result, but that the very last step, i.e. the comparison of both st_dev values, gave a final unequality. Did others also observe this failure and don't you think that the expected result should show the identity of the underlying path objects? Of course there might be legitimate arguments for the decision for the current behaviour, but I would like to know about them. I am not an expert to argue about the comments in the source code which say that "In theory, volume serial numbers are sufficient to distinguish between devices, but in practice VSN's are sometimes duplicated, so device id is also checked.[..]" The question now is: Should different (MS DOS) device names pointing to the same underlying (Windows NT) device not be compared equivalent? I could think of the following test extension (at least under Windows, regrettably I am not a posix expert to provide a similar solution): If the VSN' and further data have returned a positive result, but the check of both st_dev values fails, one should try to check whether the underlying devices are actually the same, e.g. using the ::QueryDosDeviceA/W API function. What do you think? Greetings, Daniel Krügler

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3D logo
by Joaquín Mª López Muñoz 06 Dec '04

06 Dec '04

Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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