March 2008 - Boost - lists.boost.org

cpp-netlib & pion-net
by Michael Dickey 22 Mar '08

22 Mar '08

I started writing the Pion Network Library (first called "libpion") almost a year ago to start learning Boost and to help fill a need I've repeatedly encountered over the past decade. There are several good third-party networking libraries available for C++, but none that took advantage of Boost and the new ASIO library that will be included in version 1.35. I have a lot of experience working with HTTP, and needed to develop (for the third time in my career) a lightweight HTTP server interface. Although I planned to release libpion as open source, I never gave much thought to submitting it for review to be included in Boost. Over time, and with support and encouragement from the community, my desire to do this grew. I've also been keeping up with the cpp-netlib project on SourceForge, which shares the same goal. For several months we've been kicking around the idea of merging our efforts. Today, I've decided to commit to winding down the Pion Network Library as an independent project, and merging all the code (about 15,000 lines) into the cpp-netlib project. This is going to be a gradual conversion and refactoring of code, adopting it into the framework and styles that have been established by the cpp-netlib folks. My goals will be to enhance cpp-netlib so that it is functionally equivalent to the current Pion Network Library (with asynchronous and synchronous HTTP 1.0 and 1.1 client and server-side support), and to help prepare cpp-netlib for inclusion in the next major Boost release. I expect that the transition will take at least 3 to 6 months. Because there are several entities actively using the Pion Network Library (including my own company, Atomic Labs), I plan to continue developing and enhancing it as an independent project at least until the transition has been fully completed. Dean, Glyn and I are excited about merging the two projects and developer communities, and I am happy to be part of what is now the definitive candidate for a Boost networking protocol library. Take care, -Mike

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Release 1_35_0_RC2: Boost Python hello tutorial
by Johannes Brunen 22 Mar '08

22 Mar '08

Hi, today I have tried the boost python tutorial with the 1_35 release candidate 2. Unfortunately it didn't worked as expected. Especially, I'm missing the hello.pyd file after building the jamroot file. Below I describe what I have done in detail. I'm working on the windows platform with the msvc-7.1 compiler. First I build the bjam.exe from the tools/jam folder with the build_dist.bat script. Next I used this one to build all the boost libraries by running bjam --toolset=msvc-7.1 release debug stage from the command line. I then swichted to the libs/python/example/tutorial directory and called bjam --toolset=msvc-7.1 release debug from the command line. This failed with this output F:/Development/Libraries/boost_1_35_0_RC2/tools/build/v2/build\project.j am:307: in load-jamfile F:/Development/Libraries/boost_1_35_0_RC2/tools/build/v2/build\project.j am:63: in load F:/Development/Libraries/boost_1_35_0_RC2/tools/build/v2/build\project.j am:167: in project.find F:/Development/Libraries/boost_1_35_0_RC2/tools/build/v2\build-system.ja m:516: in load F:\Development\Libraries\boost_1_35_0_RC2\libs\python\example\..\..\..\t ools\build\v2/kernel\modules.jam:267: in import F:\Development\Libraries\boost_1_35_0_RC2\libs\python\example\..\..\..\t ools\build\v2/kernel/bootstrap.jam:132: in boost-build F:\Development\Libraries\boost_1_35_0_RC2\libs\python\example\boost-buil d.jam:7: in module scope I then added the following line at the beginning of the jamroot file: import python ; After running the bjam again I found the following files in the bin/msvc-7.1/release/threading-multi subdirectory. hello.obj hello.obj.rsp hello_ext.exp hello_ext.lib hello_ext.pyd.rsp As you can see. The hello.pyd (or hello_ext.pyd) file is missing. In order to confirm that I didn't fool myself, I tried exactly the same procedure with the current boost release 1_34_1. Here I found these files in the threading-multi subdirectory. hello.exp hello.lib hello.obj hello.obj.rsp hello.pyd hello.pyd.rsp With the hello.pyd file I was able to run the import from within the python interpreter. Is this a known problem? Is my procedure correct? Any tips what I can do? Johannes Brunen DataSolid GmbH

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[inspect][1.35] Link check fixes
by Daniel James 22 Mar '08

22 Mar '08

Hi, Some of the link errors in the inspect report are incorrect. I checked some fixes into trunk: http://svn.boost.org/trac/boost/changeset/43750 http://svn.boost.org/trac/boost/changeset/43752 The first one causes it to check links in single quotes - this fixes a couple of incorrect unlinked file reports in iostream (although 'libs/iostreams/doc/concepts/multi-character.html' is unlinked). The second changeset decodes urls with percent encoded characters and encoded ampersands - this fixes about 200 incorrect link errors in the doc directory (but there are a few left). There's no real need to add these changes to release at this late stage, just note that some of the link errors are incorrect. Daniel

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Re: [boost] [shared_ptr] gcc 3.2 build broken with current trunk
by Ralf W. Grosse-Kunstleve 22 Mar '08

22 Mar '08

Hi Frank, Your patch resolves the error I posted before, but there are still other, similar errors while compiling other Boost.Python sources. I think this is the problem: shared_ptr.hpp: if(del_wrapper) del = del_wrapper->get_deleter<D>(); ^^^ ^^^ I think gcc 3.2 doesn't support this syntax. In the old days this was a common problem. The usual workaround is to use a type holder. See the patch below, which resolves all my compilation errors. Ralf P.S.: I bet there must be a central type holder in boost somewhere, but I couldn't find it. Index: shared_ptr.hpp =================================================================== --- shared_ptr.hpp (revision 43744) +++ shared_ptr.hpp (working copy) @@ -633,6 +633,8 @@ #endif +template <class T> struct sp_dw_type_holder { typedef T type; }; + class sp_deleter_wrapper { shared_ptr<const void> _deleter; @@ -649,7 +651,7 @@ _deleter.reset(); } template<typename D> - D* get_deleter() const + D* get_deleter(sp_dw_type_holder<D> const&) const { return boost::detail::basic_get_deleter<D>(_deleter); } @@ -663,7 +665,7 @@ if(del == 0) { detail::sp_deleter_wrapper *del_wrapper = detail::basic_get_deleter<detail::sp_deleter_wrapper>(p); - if(del_wrapper) del = del_wrapper->get_deleter<D>(); + if(del_wrapper) del = del_wrapper->get_deleter(detail::sp_dw_type_holder<D>()); } return del; }

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Re: [boost] [python] set iteration
by Ralf W. Grosse-Kunstleve 22 Mar '08

22 Mar '08

In C++? I don't know the most elegant solution, but one that should work easily is to convert the set to a boost::python::list, maybe (untested): void foo(boost::python::object s) { boost::python::list l(s); long n = boost::python::len(l); for(long i=0;i<n;i++) { boost::python::extract<int> proxy(l[i]); int v = proxy(); } } Probably, a more efficient solution is to use PyObject_GetIter() and PyIter_Next(), but to make this safe you have to mess with boost::python::handle<> and PyErr_Clear(). Look here for a related example: http://phenix-online.org/cctbx_sources/scitbx/include/scitbx/boost_python/c… Ralf ----- Original Message ---- From: Gennadiy Rozental <rogeeff(a)gmail.com> To: boost(a)lists.boost.org Sent: Friday, March 21, 2008 11:45:18 AM Subject: [boost] [python] set iteration How do I iterate over object that correspond to python set? Gennadiy _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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Trac support requests
by Marshall Clow 21 Mar '08

21 Mar '08

Thanks to everyone who dealt with the support requests. These are what's left. Some of these are from 2006, folks..... Support Requests 2 vladimir_prus 2 az_sw_dude 1 nobody 1 no-maintainer 1 jsiek 1 johnmaddock 1 djowel 1 dave 1 anthonyw 1 agurtovoy agurtovoy 816 duplicat initial members -> erase_key postcond. fail anthonyw 1053 Error using boost::mutex and C++/CLI az_sw_dude 605 support new 2007 DST rules for timezone db az_sw_dude 614 new timezone db file for #1471723 - 2007 DST support dave 1262 [Boost.Iterators] Reasoning for boost::pointee<> not supporting back_insert_iterator? djowel 1221 Section names may cause html names to be too long johnmaddock 1636 Bug in regex? jsiek 580 Max Flow Algorithm no-maintainer 426 lambda vs pure virtual functions nobody 597 Non-basic-source-character-set characters conflict with MSVC vladimir_prus 1132 program_options documentation error. vladimir_prus 850 program_options strips off escaped quotes in some situations -- -- 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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Trac open bugs - by assignee
by Marshall Clow 21 Mar '08

21 Mar '08

[ 227 open tickets today, 227 yesterday ] 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 23 djowel 21 az_sw_dude 14 grafik 13 vladimir_prus 13 dgregor 13 dave 12 doug_gregor 11 no-maintainer 11 bemandawes 11 agurtovoy 7 turkanis 7 jsiek 7 anthonyw 6 johnmaddock 5 witt 5 igaztanaga 4 ramey 4 ebf 3 nesotto 3 matias 3 kaalus 3 danielw 2 shammah 2 samuel_krempp 2 rogeeff 2 pavol_droba 2 nasonov 2 marshall 2 jmaurer 2 hkaiser 2 danieljames 2 aaron_windsor 1 urzuga 1 t_schwinger 1 speedsnail 1 pdimov 1 garcia 1 fcacciola 1 dlwalker 1 None None 1644 Boost.Test missing documentation file BOOST_CHECK_CLOSE_FRACTION.html aaron_windsor 1622 Adjacency list needs to handle self-edges correctly 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 1549 Boost.MPL: 'index_of' algorithm is not documented agurtovoy 1568 duplicate include guards agurtovoy 588 mpl::remove compile error with gcc 4.1.0 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 1657 Bug in boost::threads sample 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 1574 operator<< for boost::posix_time::ptime ignores ostream flags az_sw_dude 1674 date_time::date_formatting.hpp: incorrectly formats year using global locale az_sw_dude 1695 add correct namespace to class to fix compilation bug 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 1578 bug in readdir_r_simulator() in a multi-threaded environment bemandawes 1583 Serious flaw in boost::filesystem filename handling (opensuse) bemandawes 1589 [filesystem] 'mbstate_t' : is not a member of 'std' bemandawes 1606 filesystem/src/exception.cpp doesn't build with gcc bemandawes 1613 Link Errors against file_system on OS X with Intel Version 10.1 C++ compilers bemandawes 1682 path_traits needs imbue() bemandawes 1701 boost::filesystem::remove_all - segmentation fault with wpath on Linux bemandawes 752 directory_iterator doesn't work with catch danieljames 1554 When BOOST_HASH_NO_EXTENSIONS is defined hash doesn't support new string types. danieljames 1555 When BOOST_HASH_NO_EXTENSIONS is defined hash doesn't support boost::system::error_code 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 1599 [python] '_set_se_translator': identifier not found dave 1697 [utility][noncopyable] ADL barrier broken by msvc-9.0 dave 865 Use of C++0x keyword as identifier dave 910 gcc strict-aliasing problems with python dgregor 1009 Improper overflow handling in shortest paths algorithms dgregor 1164 Floyd Warshall broken with unsigned edge weights dgregor 1192 [boostbook] problem when two files have the same name dgregor 1199 configure doesn't work with path containing whitespaces (MacOS X) 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 1395 Write Tests for Python Bindings dgregor 1630 gcc-4.3: adjacency_list.hpp includes deprecated header dgregor 1680 long long and wchar_t support in MPI 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 djowel 1570 Some boost headers aren't ready for gcc 4.3 djowel 1600 duplicate include guard djowel 1601 distane of boost::tuple djowel 1607 Tuple Library Documentation Changes djowel 1610 [MSVC/STLport] [tree/common.hpp] Standard library requirements violation(incomplete type as vector parameter) djowel 1614 vector workaround needed for MSVC9 djowel 1617 spirit gcc-4.3 fix djowel 1619 [Fusion] C4512 warnings from VC9 (Visual Studio 2008) 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 1548 [variant][docs]typo: formal arg_ operand_ should be v in times_two arglist ebf 1654 recursive variants do not handle nested variants correctly. ebf 993 Variant should use least common multiple of alignments_ rather than maximum fcacciola 1666 Visualizer for boost::optional garcia 1581 Boost.MultiArray: Resizing bug if the index is not 0-based grafik 1041 Cygwin requires PATH setting. 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 1571 boost bugtracker displays a patch incorrectly grafik 1576 cannot read non-ASCII output messages grafik 1577 Some commands don't work because hStdInput == 0 grafik 1663 build.bat cannot set/reset ERRORLEVEL 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. hkaiser 1670 wave almost unusably slow on real-world input igaztanaga 1080 boost::interprocess win32 global file mapping issue igaztanaga 1210 interprocess::barrier hangs during second use under linux (boost 1.33.1) igaztanaga 1390 Interpocess: managed shared memory failing completely under OS X igaztanaga 1634 boost::interprocess::vector cannot contain volatile int igaztanaga 1635 Incomplete include guard in boost/intrusive jmaurer 351 Diff in state of mersenne_twister gen between GCC3.41 & CW9 jmaurer 599 uniform_01 copies engine instead of using a reference 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 1446 POSIX API doesn't use C locale johnmaddock 1451 error: use of C99 long long integer constant johnmaddock 1626 [type_traits] "bad_alloc is not a member of std" in has_virtual_destructor_test.cpp jsiek 1531 segfault in dynamic_bitset::reference assign operator jsiek 1540 Poisson distribution very slow for large mean (and may also overflow). 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 kaalus 1604 property_tree xml parser doesn't compile with gcc kaalus 1678 Boost.property_tree::read_xml does not parse UNICODE file with BOMs marshall 1252 [pool] severe overhead with unaligned sizes. marshall 1493 SVN files making it through to install matias 1406 Understanding the Tables outdated matias 1651 incorrect typedefs in examples matias 1676 Dead links on Boost.Test example documentation. nasonov 1220 lexical_cast requires RTTI nasonov 754 boost::any - typeid comparison across shared boundaries nesotto 1629 range/iterator_range.hpp bug nesotto 1675 [range] VC8 - compiler warnings when including range/array headers nesotto 1694 NDEBUG vs. BOOST_ASSERT in iterator_range.hpp no-maintainer 1068 Mersenne twister disables streaming for Visual C++ no-maintainer 1222 lambda::ret<T> should declare result_type. no-maintainer 1270 uniform_smallint doesn't compile with lagged_fibonacci random number generators no-maintainer 1515 [lambda] C4512 warnings from VC8.0 no-maintainer 1544 uniform_01 w/ref template param causes ref to ref error no-maintainer 1546 Method boost::random::uniform_int::operator()(engine_ value) is missing no-maintainer 1572 [lambda] smart pointer const-ness affects its contents no-maintainer 1632 Default Interval rounding policies incomplete no-maintainer 1691 [Random] Brokem MSVC workaround no-maintainer 781 Lambda: (_1 + "y")(string("x")) Doesn't Compile no-maintainer 819 uniform_int<> with type's maximum availaible range error 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* ramey 1285 [serialization] problem when including shared_ptr_132.hpp ramey 1628 Lack of wide character support prevents boost.serialization from linking ramey 1662 boost::serialization for boost::optional - missing include ramey 1689 [serialization] Update a link rogeeff 1383 signal.h features not found on Mac OS rogeeff 1542 [test] compiler errors when building with stdcxx library samuel_krempp 1699 Compile warning about initialization order. samuel_krempp 859 boost::format ignores a user defined locale shammah 290 perfomance: memory cleanup for pool takes too long shammah 386 boost::pool_allocator breaks with vector of vectors speedsnail 1138 Problems with TSS and static thread library t_schwinger 1653 wave executable erroneously required for build of function_types lib turkanis 1523 [iostreams] VC8/VC9 compiler warnings turkanis 1545 [boost/rational.hpp] 'noskipws' is not a member of 'std' turkanis 1579 gzip compressor should model DualUseFilter turkanis 1580 Add static assert to prohibit instantiating a chain with mode dual_use turkanis 1649 Fix definition of JavaScript menu to avoid long chains of functions turkanis 1656 Consider implementing flush() for symmetric filters turkanis 1671 type mismatch of buffer size parameter causes overload resolution to fail urzuga 574 [boost::lambda] Compile error with libstdc++ debug mode 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 1584 cryptic bbv2 error building quickbook vladimir_prus 1587 [program_options] crashes if value part missing in external configuration file vladimir_prus 1588 [program_options] crashes if value part missing in external configuration file vladimir_prus 1645 Invalid unicode support for default_value vladimir_prus 1679 added 4-way universal binary support from mac osx (ppc_ ppc64_ i386_ x86_64) 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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[python] set iteration
by Gennadiy Rozental 21 Mar '08

21 Mar '08

How do I iterate over object that correspond to python set? Gennadiy

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Re: [boost] Passing strings as a template parameter (small utility)
by Tom Brinkman 21 Mar '08

21 Mar '08

>> Just use mpl::vector_c<char, ....>. >> Really, what else is there to do? Not much. Good Idea. typedef mpl::vector_c<char,'H','e','l','p'> help_t; To pull the string out, I believe that you can do this. std::vector<std::string> help; boost::mpl::for_each<help_t>( boost::bind(&std::vector<std::string>::push_back, &help, _1)); >> Why would one bother to do this. Good question. Maybe just because they say that you cant.

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[shared_ptr] gcc 3.2 build broken with current trunk
by Ralf W. Grosse-Kunstleve 21 Mar '08

21 Mar '08

The shared_ptr (enable_shared_from_this) patch from yesterday breaks our gcc 3.2 builds. Below is a fragment from a Boost.Python unit test (but not requiring Python) and the error produced by gcc 3.2 (Redhat 8.0). gcc 3.2.3 (Redhat Workstation 3) has the same problem. Is there a way to restore compatibility with the old gcc versions? Thanks! Ralf % g++ -c -fno-strict-aliasing -fPIC -I/net/rosie/scratch1/rwgk/hot/boost ~/sp_err.cpp /net/rosie/scratch1/rwgk/hot/boost/boost/shared_ptr.hpp: In function `D* boost::get_deleter(const boost::shared_ptr<Y>&) [with D = boost::detail::sp_deleter_wrapper, T = A]': /net/rosie/scratch1/rwgk/hot/boost/boost/enable_shared_from_this.hpp:97: instantiated from `void boost::enable_shared_from_this<T>::_internal_accept_owner(boost::shared_ptr<Y>&) const [with U = A, T = A]' /net/rosie/scratch1/rwgk/hot/boost/boost/shared_ptr.hpp:100: instantiated from `void boost::detail::sp_enable_shared_from_this(boost::shared_ptr<Y>*, const boost::enable_shared_from_this<T>*) [with T = A, Y = A]' /net/rosie/scratch1/rwgk/hot/boost/boost/shared_ptr.hpp:181: instantiated from `boost::shared_ptr<T>::shared_ptr(Y*) [with Y = A, T = A]' /net/cci/rwgk/sp_err.cpp:22: instantiated from here /net/rosie/scratch1/rwgk/hot/boost/boost/shared_ptr.hpp:666: no matching function for call to `boost::detail::sp_deleter_wrapper::get_deleter()' % cat ~/sp_err.cpp #include <boost/enable_shared_from_this.hpp> #include <boost/shared_ptr.hpp> using namespace boost; class A : public enable_shared_from_this<A> { public: A() : val(0) {}; int val; typedef shared_ptr<A> A_ptr; A_ptr self() { A_ptr self; self = shared_from_this(); return self; } }; class B { public: B() { a = A::A_ptr(new A()); } void set(A::A_ptr _a) { this->a = _a; } A::A_ptr get() { return a; } A::A_ptr a; };

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