- Boost - lists.boost.org

Asynchronous Boost.Iostreams with Boost.Asio
by Boris 08 Apr '08

08 Apr '08

I read in the documentation of Boost.Iostreams (at http://www.boost.org/doc/libs/1_35_0/libs/iostreams/doc/guide/asynchronous.…) that "additional Device concepts will be required for full support of asynchronous i/o". Are there any ideas how these additional devices concepts will/should look like? I ask as I was trying to extend Boost.Asio and add support for C++ standard streams on the weekend. I came to the conclusion that this is impossible (as calls to C++ standard streams block and there is no way to interrupt a blocking call, at least not in a portable way). If there are any ideas though how to support asynchronous I/O with Boost.Iostreams I'd like to hear them. But I guess that would still mean that you can't use C++ standard streams (like std::cin) asynchronously? Boris

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[filesystem][1.35] dependency on boost::system
by Alexander Arhipenko 08 Apr '08

08 Apr '08

Guys, we've got an issue while upgrading to release 1.35 of boost libraries. Since boost::filesystem now depends on boost::system, following list of linker errors appears ONLY on windows platform (VC9 compiler is used): source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) class boost::system::error_category const & __cdecl boost::system::get_system_category(void)" (__imp_?get_system_category@system@boost@@YAABVerror_category@12@XZ) referenced in function "public: __thiscall boost::system::error_code::error_code(void)" (??0error_code@system@boost@@QAE@XZ) source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) class boost::system::error_category const & __cdecl boost::system::get_posix_category(void)" (__imp_?get_posix_category@system@boost@@YAABVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'posix_category''(void)" (??__Eposix_category@system@boost@@YAXXZ) ..\bin\bsys\msvc-8.0\debug\threading-multi\use_boost_filesystem.dll : fatal error LNK1120: 2 unresolved externals In attach there is a minimal project (source.cpp + Jamfile) that reproduces the problem and a patch that fixes the problem. Thanks, waiting for your feedback Sasha

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GSoC: JSON project
by Jeremy Cowles 07 Apr '08

07 Apr '08

Hi all, I am a student and am writing a proposal for Google Summer of Code based on the JSON idea<http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Google_Summe…>. I was wondering if anyone has any addition thoughts on JSON serialization and how people feel about it in general. Thanks, Jeremy

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Re: [boost] Logging library review results
by Ronald Garcia 07 Apr '08

07 Apr '08

Hi John, I have received your request and am adding the logging library back into the review queue. Cheers, ron On Mar 18, 2008, at 4:52 PM, John Torjo wrote: > Hi All, >> I read through the submitted reviews and here is a short summary: >> >> > Thanks to all who contributed. Now I'll know what needs to be > improved - > again ;) > > I'd like to formally ask for another review mid-end July. > So, looking for a review manager - again ;)

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Trac open bugs - by assignee
by Marshall Clow 07 Apr '08

07 Apr '08

[ 276 open bugs today, 262 on Friday ] 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 28 grafik 25 djowel 23 az_sw_dude 15 vladimir_prus 14 dave 14 bemandawes 13 dgregor 12 doug_gregor 11 no-maintainer 11 agurtovoy 9 anthonyw 8 ramey 8 jsiek 7 turkanis 6 nesotto 5 witt 5 rogeeff 5 matias 5 johnmaddock 5 igaztanaga 5 None 4 ebf 4 danielw 3 pdimov 3 pavol_droba 3 nasonov 3 kaalus 3 danieljames 2 shammah 2 samuel_krempp 2 jmaurer 2 hkaiser 2 aaron_windsor 1 urzuga 1 t_schwinger 1 speedsnail 1 marshall 1 garcia 1 fcacciola 1 dlwalker 1 chris_kohlhoff 1 <Blank> <Blank> 1750 Autolink library name not in sync with actually build lib None 1644 Boost.Test missing documentation file BOOST_CHECK_CLOSE_FRACTION.html None 1736 Headers containing non ASCII characters cause MS VC to issue warning 4819 in some locales None 1744 No information on building static libraries with bjam under Windows None 1763 wrong AST when parser_tag==0 None 1782 missing include in boost/serialization/utility.hpp 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 1713 no definitions for copy ctor and assignment operator for basic_condition_variable anthonyw 1780 Boost 1.35.0 on linux missing thread_start and get_current_thread_state 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 1726 boost/date_time/posix_time/time_formatters.hpp incorrectly formats fractional seconds using global locale az_sw_dude 1740 date_time includes <windows.h> 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 1711 Boost Serialization export facility broken on gcc 4.1_ 4.2 bemandawes 1767 missing file: boost/filesystem/cerrno.hpp bemandawes 1768 system: error_code.cpp #defines macros without checking whether already defined bemandawes 752 directory_iterator doesn't work with catch chris_kohlhoff 1703 [asio] Compiler warnings on VC8/9 + warning level 4 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 danieljames 1705 [boostbook] Spaces in reference file names for types like 'long long' 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 danielw 1784 [parameter] missing include 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 1730 No debug libs on Windows by default 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) djowel 1722 [TR1/Fusion] Conflict between TR1 and Fusion headers djowel 1764 wrong AST when parser_tag==0 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 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 1731 Website 'bugs' grafik 1733 Website layout overlays on IE7 grafik 1735 [website] Wrong HTML on main documentation page. grafik 1738 Boost Jam details and download link grafik 1739 Search box and Google link grafik 1741 Review schedule out of date grafik 1742 Some bugs in http://www.boost.org/doc/libs/1_35_0 grafik 1743 Documentation has incorrect Build & Link settings for some libraries grafik 1753 Python docs: bad link to the Jamroot grafik 1769 Broken links in documentation index. grafik 1771 Statechart TOC mangled. grafik 1775 website bugs for 1.35.0 docs grafik 1776 Documentation page renders incorrectly in Safari 3.1 on OS X grafik 1779 Whos using boost link broken grafik 1783 No link to wiki 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 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 1765 Need a macro to determine whether basic streams are present jsiek 1531 segfault in dynamic_bitset::reference assign operator jsiek 1540 Poisson distribution very slow for large mean (and may also overflow). jsiek 1755 Boost.tokenizer is broken for wide characters - patch attached 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. matias 1406 Understanding the Tables outdated matias 1651 incorrect typedefs in examples matias 1676 Dead links on Boost.Test example documentation. matias 1707 small typos in Boost.serialization documentation matias 1727 Sample code in documentation does not compile_ has namespace errors. nasonov 1220 lexical_cast requires RTTI nasonov 1704 [any] 4512 warning from VC8/9 on warning level 4 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 nesotto 1748 [ptr_container] compiler warnings from VC9 nesotto 1754 Illegal HTML in range docs. nesotto 1785 assign::list_of works poorly with class constructors 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 pavol_droba 1761 StringAlgo: Error in an example pdimov 1106 shared_ptr<T> should not convert to shared_ptr<U> when T* doesn't convert to U* pdimov 1719 [addressof] Can't obtain the address of an instance of an anonymous struct pdimov 1762 BOOST_DISABLE_THREADS should imply BOOST_SP_DISABLE_THREADS ramey 1285 [serialization] problem when including shared_ptr_132.hpp ramey 1708 Can't serialize class with private destructor ramey 1734 BOOST_STATIC_WARNING can't be passed a dependent expression ramey 1747 [serialization] unreferenced formal parameter warnings from VC9 ramey 1773 VC8 compiler bug makes boost spill types into global namespace_ which breaks IntelTBB ramey 1774 serialization: file written with 1.34.1 can't be read in with 1.35 ramey 1778 Possible regression in 1.35 serialization of 2D arrays ramey 1786 BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION not defined in detail/basic_(i|o)archive.hpp rogeeff 1383 signal.h features not found on Mac OS rogeeff 1542 [test] compiler errors when building with stdcxx library rogeeff 1723 No subprocess can be started in init_unit_test_suite rogeeff 1746 Online documentation for 1.35.0 is out of date for current lib version rogeeff 1781 Empty page in Test documentation 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 1132 program_options documentation error. 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 vladimir_prus 850 program_options strips off escaped quotes in some situations 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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[circular-buffer] indexes
by Neal Becker 07 Apr '08

07 Apr '08

I use my own implementation of circular buffers which simulate an infinite buffer that simply wraps around. The indexes are not restricted in either positive or negative direction. This is a very useful construct (believe it or not). It looks like boost::circular_buffer restricts the indexes. I suppose the straightforward way to use boost::circular_buffer would be derive from it and add a modulus operation to the indexing?

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[asio] asio and rtti
by Mojmir Svoboda 07 Apr '08

07 Apr '08

hello, i'd like to use asio in our project but there's one catch: asio uses rtti and our project compiles with rtti off. is the rtti code really necessary? can't it be done otherwise? thanks for your attention, mojmir ps: perhaps i'll be doing a port for xbox360 and ps3, are you interested? (if there aren't "any legal fidgy-widginess upsetting natural justice")

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Re: [boost] Review Request: Generalization of the Pimpl idiom
by Vladimir.Batov＠wrsa.com.au 07 Apr '08

07 Apr '08

... > No, you can't have variadic templates with template metaprogramming. Sorry, > you should use PREPROCESSOR programming. I have never use it yet, but > waiting from variadic templates it seams the single way. > See http://www.boost.org/doc/libs/1_35_0/libs/preprocessor/doc/index.html. Looked at the reference. I heard "whoosh" when it flew high over by head. :-) Maybe I'll get to use that stuff but not until I really have to. :-) ... > I was proposing to help you with the shared memory issues, not to do it. Any > way, I could start with the first ideas, but I can not manage with the > tests. Then I'll have to put that problem aside and look at it later as I have no framework (the latest Boost) to implement shared-memory support in Pimpl. Thanks, anyway. Thanks, Vladimir.

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Re: [boost] Review Request: Generalization of the Pimpl idiom
by Vladimir.Batov＠wrsa.com.au 06 Apr '08

06 Apr '08

... > By the way, do you plan to parameterize the number of arguments allowed, > using maybe preprocessor metaprogramming? Yes I know that this is quite ugly, > but do not limit the user of the library. Can you show me it could be done. I've started playing with boost::mpl but still do not see I could apply it for variable arguments. ... > Let me know if I can help you with the shared memory > issues. That'd be great. I'd integrate and reflect that in the header. If you go ahead with that, please wrap that in #if 1.35 < BOOST_VERSION #endif so that it still works with older versions of Boost that I have to use. Thanks, Vladimir.

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[fusion] map_gen interest
by Sergei Politov 06 Apr '08

06 Apr '08

Hi, Quite frenquently I'm facing the problem of creating fusion::map where the value can be determined by key using some metafunction. For instance: fusion::map< fusion::pair<int, std::vector<int> >, fusion::pair<char, std::vector<char> > > my_map; I did not find such ready to use functionality in fusion (may be my miss). So I created utility metafunction to generate such maps. For provided example, the usage of this class is the following: template<class T> struct make_vector { typedef std::vector<T> type; }; typedef mstd::map_gen<boost::mpl::vector<int, char>, make_vector>::type my_map; In other words it takes some fusion sequence and metafunction. The result is fusion map with keys from the specified sequence and values generated from keys using specified metafunction. I've found this metafunction very useful, also it easily solves the problem discussed in boost.user list: "Need boost's help with poor design". May be somebody also interested in this metafuction. Best Regards, Sergei

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