December 2007 - Boost - lists.boost.org

Re: [boost] [random] poisson_distribution problem and fix
by Topher Cooper 27 Dec '07

27 Dec '07

At 01:33 PM 12/26/2007, you wrote: >Well, sure. But the [random] poisson_distribution function doesn't >return the normal at high means. It returns 0 (slowly!). That's just >wrong. It should either be fixed or throw an exception. . . . > > > > How far off is the Poisson distribution from the normal at a mean of > > 750? How large a sample would you need to have, say, a one in a > > thousand chance of detecting the difference? (I don't know the > > answer, but if there is a problem at that extreme, its a question > > that should be answered before getting too fancy with "precise" solutions). > > > > Topher I was implying (when I should have been saying) that at some point the error of generating a *normal* random variant with a mean and standard deviate of lambda instead of a "for real" Poisson becomes too small to have any practical significance. If large lambdas are causing problems then one solution is to see if this is only occurring sufficiently far into that regime then it might make sense to just generate a normal instead. Scaling and shifting by 750 is not likely to cause much rounding errors for a standard normal deviate, but many direct algorithms for that extreme a value are likely to run into numerical problems. Topher

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[Parameter] Regression test failures
by Richard Webb 27 Dec '07

27 Dec '07

The change applied to Trunk for Ticket #1535 has caused a bunch of regression test failures in the Parameter library, due to some missing preprocessor includes. I have opened Ticket #1541 for this, and attached a patch which allows the tests to pass on MSVC 7.1/8.0/9.0. Thanks, Richard Webb

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Macro for boost version identification
by Felipe Magno de Almeida 27 Dec '07

27 Dec '07

Hi, Shouldn't boost create a macro that identifies which version of boost is being included? I need to write code like this: #if BOOST_VERSION >= 35 #include <boost/ptr_container/serialize_ptr_list.hpp> #else #include <workaround-for-ptr_list-serialization> #endif Regards, -- Felipe Magno de Almeida

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[random] poisson_distribution problem and fix
by Joel Eidsath 27 Dec '07

27 Dec '07

The poisson_distribution code will fail for any mean larger than 750 or so (on my x86_64 machine). The problem is a comparison with exp(-_mean) which evaluates as zero right around there. The easiest fix is to operate with logs instead of exponents. I changed the operator() code to be something like this: RealType product = RealType(0); for(result_type m = 0; ; ++m) { product += log(eng()); if(product <= -_mean) return m; } This also makes it possible to get rid of the init() function and the _exp_mean private member variable. A far better fix would be to use an algorithm other than Knuth's for this. Knuth's algorithm is simple, but O(n). Here is some code I wrote, converting some old Fortran code that a friend had got from Numerical Recipes once upon a time. It works, but would need actual testing before use in production code: #ifndef F_POISSON_HEADER #define F_POISSON_HEADER #include <cmath> namespace fpoisson { double rand_zero_one() { double r = 0; do { r = ((double)std::rand() / ((double)(RAND_MAX)+(double)(1))); } while (r==0.0); return r; } double gammln(const double xx) { const double cof[6] = { 76.18009173, -86.50532033, 24.01409822, -1.231739516,0.12085003e-2,-0.536382e-5}; const double stp = 2.50662827465; double x = xx - 1; double tmp = x + 5.5; tmp = (x+0.5)*log(tmp)-tmp; double ser = 1; for(int j=0;j<6;++j) { x+=1; ser+=cof[j]/x; } return tmp+std::log(stp*ser); } double prand(const int xm) { const double pi=3.141592654; double em; double t; if(xm<12) { const double g = std::exp(-xm); em = -1.0; double t = 1.0; do { em+=1; t=t*rand_zero_one(); } while (t>g); return em; } do { startloop: const double sq = sqrt(2.0*xm); const double alxm = log(xm); const double g = xm*alxm-gammln(xm+1); const double y = tan(pi*rand_zero_one()); em = sq*y+xm; if(em < 0) goto startloop; em=static_cast<int>(em); t=0.9*(1.0+pow(y,2))*exp(em*alxm-gammln(em+1)-g); } while(rand_zero_one()>t); return em; } } #endif Joel Eidsath

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[Boost.iostreams]Trunk tests failing
by K. Noel Belcourt 27 Dec '07

27 Dec '07

Hi, Has someone touched the iostreams library in the last day or so? Seems that my trunk tests failed last night with this error. error: Unable to find file or target named error: 'stream_offset_32bit_test.cpp' error: referred from project at error: '../libs/iostreams/test' Thanks. -- Noel

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Trac bugs tickets - by assignee
by Marshall Clow 26 Dec '07

26 Dec '07

[ 191 open bugs today, 195 Monday ] [ Thanks to Jonathan Turkanis, who closed five bugs on Christmas! ] If you are maintaining a library, and have not logged into the trac system at <http://svn.boost.org/trac/boost/>, please do so ASAP. Until you do that, no tickets can be assigned to you, and will remain under "None". Instructions on working with tickets can be found at: <http://svn.boost.org/trac/boost/wiki/TicketWorkflow> and a mapping of user names to "real names" can be found at: <http://svn.boost.org/trac/boost/report/16> Bug summary 18 az_sw_dude 17 dgregor 15 djowel 12 doug_gregor 11 grafik 11 dave 10 agurtovoy 8 vladimir_prus 8 turkanis 8 None 7 jsiek 7 johnmaddock 6 anthonyw 5 witt 4 igaztanaga 4 bemandawes 3 pdimov 3 jmaurer 3 ebf 3 danielw 2 urzuga 2 rogeeff 2 pavol_droba 2 niels_dekker 2 nesotto 2 nasonov 2 matias 2 <Blank> 1 t_schwinger 1 speedsnail 1 shammah 1 samuel_krempp 1 ramey 1 marshall 1 kaalus 1 hljin 1 hkaiser 1 dlwalker 1 burbelgruff 1 aaron_windsor <Blank> 1307 [lambda] invalid boostbook <Blank> 1434 Boost.Preprocessor_ small fix for the documentation None 1068 Mersenne twister disables streaming for Visual C++ None 1094 Finding the correct library to link (feature request for pkg-config support)h None 1222 lambda::ret<T> should declare result_type. None 1247 Typos in "boost/random/additive_combine.hpp"_ lines 68-69 None 1270 uniform_smallint doesn't compile with lagged_fibonacci random number generators None 1407 Boost is doesn't install on MacPorts using Leopard None 1493 SVN files making it through to install None 1515 [lambda] C4512 warnings from VC8.0 aaron_windsor 778 top-level configure is broken agurtovoy 1001 gcc 4.1.2 segfaults on mpl/test/apply.cpp agurtovoy 1051 MPL header ordering triggers bug agurtovoy 1099 unable to iterate through a "non-explicitly-declared" mpl::set agurtovoy 1215 Boost 1.34.1_ mpl: Wrong workaround detection using MinGW32 (or.hpp_ line #33) agurtovoy 1317 has_xxx randomly broken in msvc agurtovoy 1469 [mpl] nested typedef of set has two different meanings agurtovoy 1476 always<> is not nullary. agurtovoy 1528 g++ 4.3.0 reports error because of redeclaration of next agurtovoy 588 mpl::remove compile error with gcc 4.1.0 agurtovoy 640 documentation mistake anthonyw 1154 tss destruction segfaults in conjunction with dlopen/dlclose anthonyw 1168 [thread] tss crashes randomly anthonyw 1268 xtime_cmp changes to deal with overflow were reverted anthonyw 1470 Boost.Thread: Compilation errors with non-__cdecl calling convention anthonyw 876 xtime documentation incomplete anthonyw 881 errors when build with Apache stdcxx az_sw_dude 1028 typo in boost header: date_time/time_defs.hpp az_sw_dude 1078 from_iso_string cannot read the output from to_iso_string az_sw_dude 1098 Urgent libboost-date-time1.33.1 : bugs on ia64 ? az_sw_dude 1147 date_time library contains global #define ERROR az_sw_dude 1160 warning: month_format shadows a member of this az_sw_dude 1162 warning: ticks shadows a member of this az_sw_dude 1289 posix_time::time_facet forgets to pass a_ref argument to base class az_sw_dude 1299 change in typedef stringstream_type in format_date_parser.hpp causing compilation error az_sw_dude 1306 invalid docbook in date_period.xml az_sw_dude 1384 Linking problem with date_time library on Visual C++ 2008 Express az_sw_dude 1386 date_time documentation Jamfile breaks building of boost docs az_sw_dude 1524 format_date_parser.hpp(221) : cannot convert parameter 1 az_sw_dude 287 wrong usage of ios_base::narrow az_sw_dude 316 date_time type conversion warning az_sw_dude 604 from_ftime incorrectly processes FILETIME filled with zeros az_sw_dude 642 operator<< for gregorian::date_duration not found az_sw_dude 889 Insane Dependencies az_sw_dude 890 date_time library supports only the current dst rule bemandawes 1378 filesystem path invalid name for hidden files (LINUX) bemandawes 1389 filesystem::ostream << boost::format generates operator ambigious error (in MSVC++) bemandawes 1458 Darwin Tiger throws std::runtime_error: locale::facet::_S_create_c_locale name not valid bemandawes 752 directory_iterator doesn't work with catch burbelgruff 1503 typeof bug (big integral constant) danielw 1044 Argument pack inaccessable in a functions return type danielw 1054 Parameter takes an "infinite" amount of time to compile with the Intel compiler. danielw 1097 keyword.hpp generates many warnings C4180: qualifier applied to function type has no meaning; ignored dave 1010 linking boost.python on freebsd dave 1019 iterator_facade::pointer should be the return type of operator-> (DR 445) dave 1085 Python rules for compiling in Mac OS X dave 1179 [boost.python] can not export a union in VC2005sp1 dave 1181 [boost.python] can modify enum value dave 1387 Review / update docs to reflect changes dave 1460 Python classes with multiple bases are convertible only to the first class in the lists dave 1482 boost::python::throw_error_already_set should be marked noreturn dave 1516 [python] Failing VC9 regression tests dave 865 Use of C++0x keyword as identifier dave 910 gcc strict-aliasing problems with python dgregor 1003 [iostreams] copy-paste error in typedefs for wchar multichar_filters dgregor 1139 [iostreams] Regex filter segfaults when zero matches found dgregor 1140 boost::iostreams linked_streambuf bug dgregor 1149 Minor doc error in basic_null_device dgregor 1164 Floyd Warshall broken with unsigned edge weights dgregor 1185 iostreams::direct_streambuf<T_Tr>::is_open always returns false if output iterator is not null dgregor 1192 [boostbook] problem when two files have the same name dgregor 1199 configure doesn't work with path containing whitespaces (MacOS X) dgregor 1232 mapped_file_source::is_open() is broken under windows dgregor 1310 [result_of] const-qualified function pointer doesn't work dgregor 1326 Unable to check graph isomorphism using LEDA adapter dgregor 1391 dominator_tree_test on Borland/CodeGear outputs overly long line dgregor 1394 Translate libs/graph/build/python/Jamfile to BBv2 dgregor 1395 Write Tests for Python Bindings dgregor 556 Bundled graph properties dgregor 732 Johnson All-Pairs needs better "no path" information dgregor 736 Const correctness violation djowel 1170 Emit Warnings instead of # symbols in the syntax highlighter djowel 1171 Quickbook title output djowel 1172 non-utf djowel 1176 Space after inline code djowel 1206 Escaping from within code? djowel 1273 CR+LF newlines in position_iterator djowel 1276 spirit problem with _GLIBCXX_DEBUG djowel 1277 Closing section like [pre with } causes Quickbok to crash djowel 1280 sections in imported source files get put inside <para> elements in docbook output djowel 1281 Quickbook produces invalid BoostBook/DocBook XML djowel 1324 tuple should have a swap() that operates element-by-element djowel 1396 wrong result_of invocation around transform_view djowel 1436 [quickbook] inline code inside headings djowel 1484 Quickbook produces illegal docbook for some docinfo fields. djowel 1500 [Spirit/Phoenix] C4512 Compiler warnings from VC8 dlwalker 613 boost/crc.hpp uses non-standard conforming syntax doug_gregor 1021 [Graph][reverse_graph] Problem using reverse_graph adapter with an adapted user defined graph doug_gregor 1076 compile error: disconnecting struct with operator()() doesn't work in VS2005 SP1 doug_gregor 375 LEDA graph adaptors do not handle hidden nodes properly doug_gregor 402 random_vertex/random_edge are unnecessarily inefficient doug_gregor 403 Document copy_component doug_gregor 447 reverse_graph and constness of property maps doug_gregor 708 Dijkstra no_init version should not require VertexListGraph doug_gregor 733 Numbered headers don't work with "preferred" syntax doug_gregor 735 Fruchterman-Reingold grid performance can be improved doug_gregor 738 Memory leaks with signal::connect? doug_gregor 829 Implicit graph not implement doug_gregor 852 Problem with Boost and GCC 4.1 ebf 1507 [variant] C4512 warnings from VC8.0 ebf 965 [doc] boost::variant tutorial - final example uses v1_v2 should be seq1_seq2 ebf 993 Variant should use least common multiple of alignments_ rather than maximum grafik 1041 Cygwin requires PATH setting. grafik 1062 Cygwin install stage fails with combination of patches grafik 1322 trac rejects patch attachment as spam grafik 1417 Regresson tests hang in Darwin (Tiger) grafik 1430 Regression fails under Cygwin grafik 1433 Trac's spam detection rejects too many valid messages grafik 1512 Broken link to vacpp in bjam docs. grafik 1513 Broken link to bcpp in bjam docs. grafik 616 Boost Jam_ and non english directorys grafik 959 linking fails when Boost is compiled with STLport 5.1.* on Linux (names mismatch) grafik 986 Problem building Python modules on boost 1.34.0 hkaiser 1079 boost-1.34.0 fails to compile. concept checks not satisfied. hljin 1522 bit_range friend decl in bit_aligned_pixel_reference.hpp needs to be fully qualified for gcc 4.3 mainline igaztanaga 1080 boost::interprocess win32 global file mapping issue igaztanaga 1210 interprocess::barrier hangs during second use under linux (boost 1.33.1) igaztanaga 1231 interprocess_condition (emulated) hangs after notify_all(). igaztanaga 1390 Interpocess: managed shared memory failing completely under OS X jmaurer 351 Diff in state of mersenne_twister gen between GCC3.41 & CW9 jmaurer 599 uniform_01 copies engine instead of using a reference jmaurer 819 uniform_int<> with type's maximum availaible range error johnmaddock 1081 Empty string rejected as perl-style regex johnmaddock 1314 Using SSE-intrinsics in VC8 causes static assert in type_with_alignment.hpp johnmaddock 1411 Fix BOOST_PARTIAL_SPECIALIZATION_EXPLICT_ARGS johnmaddock 1440 libs/config/test/link/Jamfile.v2 confuses process_jam_log johnmaddock 1446 POSIX API doesn't use C locale johnmaddock 1451 error: use of C99 long long integer constant johnmaddock 1511 Non latin symbols in regexp jsiek 1531 segfault in dynamic_bitset::reference assign operator jsiek 416 Spelling of Edmonds-Karp-Algorithm jsiek 575 Calling subgraph::global_to_local on a root graph jsiek 636 strange compiling problem for transitive_closure jsiek 815 remove_edge core dumps on self-circle jsiek 875 No iterator based constructor for adjacency_matrix jsiek 900 graphml reader namespace handling is broken kaalus 1184 property_tree assignment (operator) bug marshall 1252 [pool] severe overhead with unaligned sizes. matias 1406 Understanding the Tables outdated matias 1539 Missing semi-colon in random library quitck start example nasonov 1220 lexical_cast requires RTTI nasonov 754 boost::any - typeid comparison across shared boundaries nesotto 1284 [range] sub_range assignment issue nesotto 1464 boost_range_array unused in several array_size() functions niels_dekker 1459 value_initialized leaves data uninitialized_ when using Borland niels_dekker 1491 value_initialized leaves data uninitialized_ when using GCC pavol_droba 1152 rle_example fails pavol_droba 1385 begin must be boost-qualified pdimov 1106 shared_ptr<T> should not convert to shared_ptr<U> when T* doesn't convert to U* pdimov 1444 scoped_ptr::operator== should be equivalent to a.get()==b.get()_ but is currently !!a==!!b pdimov 779 gcc-4.2 atomicity.h location ramey 1121 xml_archive_exception is missing seperate header file_ and documentation mismatch rogeeff 1383 signal.h features not found on Mac OS rogeeff 1489 BOOST_CHECK_CLOSE fails to compile with templated value type samuel_krempp 859 boost::format ignores a user defined locale shammah 386 boost::pool_allocator breaks with vector of vectors speedsnail 1138 Problems with TSS and static thread library t_schwinger 1100 Building boost.function_types fails cvs rev-1.1_ no chdir command in bash turkanis 1523 [iostreams] VC8/VC9 compiler warnings turkanis 525 problem with boost::iostreams when compiled with Visual C++ turkanis 699 Changing size of memory-mapped file on Windows turkanis 791 iostreams::tee_filter is for output only turkanis 817 Performance problem in iostreams turkanis 822 Incorrect usage of bad_write()_ bad_seek() etc. turkanis 824 BOOST_IOSTREAMS_HAS_LSEEK64 on Mac OS X turkanis 856 iostreams file_descriptor::write fails under Win32 urzuga 574 [boost::lambda] Compile error with libstdc++ debug mode urzuga 781 Lambda: (_1 + "y")(string("x")) Doesn't Compile vladimir_prus 1165 more quoting problems vladimir_prus 1274 Useless error message vladimir_prus 1321 invalid docbook in tool documentation vladimir_prus 1527 [program_options] Second (and subsequent) lines in tabbed text not aligned correctly vladimir_prus 1530 Program options documentation - Overview - Syntactic Information example typo vladimir_prus 1537 no value given in 'mysql_password =' vladimir_prus 469 multitoken broken vladimir_prus 689 [program_options] Endless loop with long default arguments witt 1046 Boost.Python quickstart instructions mention nonexistent target witt 583 Fixes for build on IBM pSeries for AIX and Linux witt 834 Homepage regression links witt 957 The "Getting Started" page does not mention the stdlib option witt 973 zip_iterator has value_type == reference -- -- Marshall Marshall Clow Qualcomm, Inc. <mailto:mclow@qualcomm.com> The famous British scientist, Lord Kelvin, said: "When you measure what you are speaking about and express it in numbers, you know something about it, but when you cannot (or do not) measure it, when you cannot (or do not) express it in numbers, then your knowledge is of a meagre and unsatisfactory kind."

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[integer] Implementing long long and others
by Igor Mikushkin 26 Dec '07

26 Dec '07

As I understand the integer.hpp does not support types over 32 bits at present. I used this library in my work and I had to implement long long type. I suppose it is not too hard to implement other needed integer types (like _int64, _int128 on Microsoft and Intel compilers) using types from boost/cstdint.hpp file. But it requires slight redesign of library (integer.hpp) and it may requires to introduce a recursion (not too deep). I would like to implement this if it interests somebody. Also I think user may get understandable error reports through dummy types like struct too_much_bits_error; or struct negative_number_of_bits_error; with no body. Best regards. Igor Mikushkin

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[fusion] variant adapter going away
by Joel de Guzman 26 Dec '07

26 Dec '07

Hi, I intend to remove the variant adapter from fusion. After thorough investigation, I think now that the move to make variant a fusion sequence is rather quirky. A variant will always have a size==1 regardless of the number of types it can contain and there's no way to know at compile time what it contains. Iterating over its types is simply wrong. All these imply that the variant is *not* a fusion sequence. If there are objections, I'd like to hear them. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net

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Multi Index Container - key extractor on a member of a member
by Avi Revivo 25 Dec '07

25 Dec '07

Hi All, Is it possible/exist a key extractor that can extract a member of a member of the base type stored by the Multi Index container. I tried to do this with the standard member extractor but failed to do so. Thanks in advnace, Avi Revivo -- View this message in context: http://www.nabble.com/Multi-Index-Container---key-extractor-on-a-member-of-… Sent from the Boost - Dev mailing list archive at Nabble.com.

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status of trunk and merging in changes
by Robert Ramey 25 Dec '07

25 Dec '07

I've made all the changes that I want to make for now on serialization_next_release. Now I want to merge these changes into the trunk and close the branch. a) Is this a good/appropriate time to do this? If not, when would be a good time. b) I've assumed that the best way to do the merge is just to do it the way its described in the SVN documention. I have both the trunk on my branch on my local machine and all changes are checked it so I should be able to just move to the branch and do a merge of all the changes on the branch. I've noticed some posts which describe a different procedure but its not clear to me that I can or should use a different one. Robert Ramey

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