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Comparative efficiency of lambda versus bind
by Joe Gottman 07 May '08

07 May '08

I want to use either bind or lambda to create a small function object to pass to std::transform. Is one noticeable more efficient than the other? The call would either be like transform(a.begin(), a.end(), b.begin(), boost::bind(multiplies(), _1, x)); or transform(a.begin(),a.end(), b.begin(), _1 * x); Joe Gotttman

1 0

Catching async asio errors
by Billy Chasen 06 May '08

06 May '08

Do I need to do anything special to catch an error from a boost asio async method? Or can I just wrap the method (eg: async_write) in a try/catch? (Since the initial call may be fine, but later on, an async call fails and I'm already out of the try/catch block) thanks, billy

2 1

result_of usability
by David Abrahams 06 May '08

06 May '08

The difficulty of implementing the result_of protocol has always bothered me. I've often found myself writing a primary result<...> template and several specializations to handle different cv-qualifications, and I've still not felt that I was doing it quite right. It's lucky that operator() has to be a member function, or I'd be worried about capturing the r/lvalue-ness of the function object itself. Now I just ran into another issue, from the other side of the result_of interface. If I have a function template taking a function object argument by reference, and I want to use result_of with it, I need to do something special to account for the case where I've been passed a function reference. To wit: template <class F> typename result_of<F()>::type call(F const& f) { return f(); } int f() { return 0; } int x = call(f); The problem is that in the above case, F is deduced as int(), and we form an illegal function type (one that itself returns a function type) in result_of<F()>::type. To deal with this I need something more like template <class F> typename result_of< typename mpl::if_< is_class<F> , F , typename add_pointer<F>::type >::type() >::type call(F const& f) { return f(); } Is there an easier way? -- Dave Abrahams Boost Consulting http://boost-consulting.com

5 11

GTL redesign and review process
by Simonson, Lucanus J 06 May '08

06 May '08

I thought I'd update those who are interested in on my progress redesigning the generic interfaces of my geometry type system. After implementing compile time accessors in the point_concept class and noticing that specializing them required explicit specialization of all possible values of the template parameter I realized that this won't work for more general interfaces. Specifically, polygons require iterator semantics at their interfaces. That means that the arguments to the set() interface of a polygon_concept would need to be templated for the iterator type, since that function should take an iterator range. Since functions cannot be partially specialized I moved the accessors back into the point_traits<T> stuct, where it is the struct that is specialized, and the functions can keep their template parameter lists when the user specialized the traits for their type. This however led to a erroneous attempt to wrap the point_traits accessor with a templated function (such as a wrapper in the point_concept struct). In the example below, I show a free function wrapper. Directly instantiating and calling the point_traits<T>::get<int>(T) function compiles, but calling the free function wrapper does not compile and gives an error about operator<. //demo point type struct point_data { int coords_[2]; int get(int orient) const { return coords_[orient]; } typedef int coordinate_type; }; template <typename T> struct point_traits { typedef typename T::coordinate_type coordinate_type; template<int orient> static inline coordinate_type get(const T& point) { return point.get(orient); } }; template <int orient, typename T> typename point_traits<T>::coordinate_type get(const T& point) { return point_traits<T>::get<orient>(point); } int main() { point_data pt; //this line compiles int value0 = point_traits<point_data>::get<0>(pt); //this line does not compile int value = get<0>(pt); return 0; } Note, if the free function directly uses the API of the data type it compiles, but as I explained initially, I need the indirection of going through the point_traits struct to allow specialization without getting burned by the language disallowing partial specialization of functions. This leaves me in something of a pickle. Because it was what I wanted to do anyway in the first place, my solution is to take the orient parameter out of the template list and make it runtime. The compiler readily accepts that syntax. After rewriting the example code that way, and getting it compiling and working satisfactorily, I was very pleased to notice that all of the code that looked like: if(orient == HORIOZNTAL) return get<HORIZONTAL>(point); return get<VERTICAL>(point); was gone, and access through any path of indirection would result in no if statements needing to be executed. I did implement a compile time accessor in the point concept (it calls the runtime one in the point_traits struct) but it doesn't make a lot of sense to have it, since: template <typename T> typename point_traits<T>::coordinate_type point_concept::x(const T& point); is more concise. Since this isn't a tuple or some n-dimensional hyper-point there is no need for meta-programming its accessors. So, I also went ahead and implemented the pattern for polygon data types. I translated some of the algorithms that operate on a polygon to use the new interface to get a taste for what was in store for me. In the guts of the polygon_type related code is an algorithm (implemented as an iterator) for converting the "compact" representation of a manhattan polygon with one integer per edge to a sequence of points at its vertices. The increment operator looks thusly: inline iterator_points& operator++() { ++iter_; if(iter_ == iter_end_) { if(point_concept::get<HORIZONTAL>(pt) != firstX_) { --iter_; point_concept::set<HORIZONTAL>(pt, firstX_); } } else { point_concept::set(pt_, orient_, *iter_); orient_.turn90(); } return *this; } Note: that most of the time it updates a point pt_, which is a member of the iterator_points class based on the *runtime* value of orient_, and then changes the runtime value each time it is called. When executed in a loop this results in no branch instructions other than the ones checking for loop termination (and the special case for last vertex). If I used compile time accessors as the interface to the data type there would be an extra branch in that loop for no good reason when using my own point type (the common case.) Thoughts? Thanks, Luke

3 4

[Math Statistical Distributions] Hypergeometric distribution
by Johan Råde 06 May '08

06 May '08

Hi John, Do you have any plans to add support for the hypergeometric distribution? That distribution is important for the Fisher exact test for independence in a 2x2 table. --Johan

4 14

[GTL] geometry type introspection
by Simonson, Lucanus J 06 May '08

06 May '08

I've been working on an idea for using some compile time concept type introspection and tag dispatching to allow generically named free functions (such as contains()) to compile and work in user code when called with any sensible combination of geometry types. This should make user code much more concise than with my current design; all the concept related boilerplate can be dispensed with. //should compile bool result1 = contains(rectangle1, rectangle2); //should compile bool result2 = contains(rectangle1, point); //should compile bool result3 = contains(interval1, interval2); //should compile bool result4 = contains(interval1, coordinate_value); //should not compile because it is non-sensical bool result5 = contains(rectangle1, interval1); //should not compile because it is non-sensical bool result6 = contains(coordinate_value, point1); The idea is that a geometry_traits struct be specialized for each geometry data type such that it provides a typedef for the related geometry concept. That typedef can be inspected at compile time to provide type introspection and passed as a tag value for tag dispatching. See example code pasted below. The one problem with this scheme is that it doesn't allow a user type to model more than one geometry type. That means that if someone models point with std::pair<int, int> it makes it impossible for someone else to model interval with std::pair<int, int> anywhere where the declaration of the one for point is visible. I consider that to be a good thing because it enforces type safety on user types, since you lose the protection of the compiler from inadvertently using point data as interval data if you model std::pair<int, int> as both. However, people eager to use tuple for all of their applicable geometry data types should take note of this limitation. Do you guys prefer this scheme to what I showed in example3.cpp? Thanks, Luke //some point related code omitted struct rectangle_concept { template <typename rectangle_type, typename rectangle_type2> static bool contains_dispatch(const rectangle_type& rectangle, const rectangle_type2 rectangle_contained, rectangle_concept tag) { std::cout << "rectangle contains rectangle\n"; } template <typename rectangle_type, typename point_type> static bool contains_dispatch(const rectangle_type& rectangle, const point_type point_contained, point_concept tag) { std::cout << "rectangle contains point\n"; } template <typename rectangle_type, typename geometry_type> static bool contains(const rectangle_type& rectangle, const geometry_type& contained_geometry_object); }; struct no_type {}; template <typename T> struct geometry_traits { typedef no_type geometry_concept; }; template <> struct geometry_traits<point_data<int> > { typedef point_concept geometry_concept; }; template <> struct geometry_traits<rectangle_data<int> > { typedef rectangle_concept geometry_concept; }; template <typename rectangle_type, typename geometry_type> bool rectangle_concept::contains(const rectangle_type& rectangle, const geometry_type& contained_geometry_object) { //disambiguate function to call through tag dispatching return rectangle_concept::contains_dispatch(rectangle, contained_geometry_object, typename geometry_traits<geometry_type>::geometry_concept()); } //function that should copile for any two geometry types that may have a containment relationship template <typename geometry_type_1, typename geometry_type_2> bool contains(const geometry_type_1& geometry_object, const geometry_type_2& contained_geometry_object) { //select function to call through introspection typename geometry_traits<geometry_type_1>::geometry_concept concept_instantiation; return concept_instantiation.contains(geometry_object, contained_geometry_object); } void foo() { rectangle_data<int> rect1, rect2; point_data<int> point; rectangle_concept::contains(rect1, point); rectangle_concept::contains(rect1, rect2); contains(rect1, point); contains(rect1, rect2); } output from calling foo(): rectangle contains point rectangle contains rectangle rectangle contains point rectangle contains rectangle

2 2

Trac open bugs - by assignee
by Marshall Clow 06 May '08

06 May '08

[ 302 open bugs today, 301 last Friday ] Note that these will be intermittent while I am at BoostCon..... 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 33 djowel 25 az_sw_dude 23 dgregor 21 grafik 19 dave 17 vladimir_prus 16 bemandawes 12 ramey 12 no-maintainer 12 anthonyw 11 turkanis 11 agurtovoy 10 jsiek 9 rogeeff 8 nesotto 6 danieljames 5 igaztanaga 4 witt 4 pavol_droba 4 nasonov 4 johnmaddock 4 ebf 3 samuel_krempp 3 kaalus 3 danielw 2 troyer 2 shammah 2 marshall 2 jmaurer 2 hkaiser 2 garcia 1 urzuga 1 t_schwinger 1 speedsnail 1 matias 1 jano_gaspar 1 gmelquio 1 fcacciola 1 dlwalker 1 aaron_windsor 1 None 1 <Blank> <Blank> 1750 Autolink library name not in sync with actually build lib None 1736 Headers containing non ASCII characters cause MS VC to issue warning 4819 in some locales aaron_windsor 1622 Adjacency list needs to handle self-edges correctly 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 1805 thread creation crashes with /Zp1 switch in VS2005 compiler anthonyw 1813 Signed/Unsigned warning in win32/condition_variable anthonyw 1825 thread.hpp injects windows.h and breaks user application. anthonyw 1826 Auto detection of threadapi and target-os broken under cygwin gcc anthonyw 1867 Missing member functions in shared_mutex (win32) anthonyw 1881 max() & min() macros are leaking from <windows.h> into entire project 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 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 1788 local_time::local_time_period streaming operators not implemented az_sw_dude 1859 boost::gregorian::to_tm() doesn't fill in tm_zone on Mac OS X az_sw_dude 1878 Documention Corrections - Various date_time Pages 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 1840 name check functions have different behavior wrt empty string bemandawes 1876 portable_file_name() returns true for '.' and '..' 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 danieljames 1705 [boostbook] Spaces in reference file names for types like 'long long' danieljames 1742 Some bugs in http://www.boost.org/doc/libs/1_35_0 danieljames 1743 Documentation has incorrect Build & Link settings for some libraries danieljames 1818 The tables in status reports jump all over the place. 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 1730 No debug libs on Windows by default dave 1744 [getting started] No information on building static libraries with bjam under Windows dave 1851 Issue with proxies and rvalues dave 1860 zip_iterator::value_type should not be reference dave 1887 [doc] input_iterator_archetype is not a valid InputIterator dave 1890 Missing parameters in example code 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 1021 [Graph][reverse_graph] Problem using reverse_graph adapter with an adapted user defined graph dgregor 1076 compile error: disconnecting struct with operator()() doesn't work in VS2005 SP1 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 1630 gcc-4.3: adjacency_list.hpp includes deprecated header dgregor 375 LEDA graph adaptors do not handle hidden nodes properly dgregor 402 random_vertex/random_edge are unnecessarily inefficient dgregor 403 Document copy_component dgregor 447 reverse_graph and constness of property maps dgregor 556 Bundled graph properties dgregor 708 Dijkstra no_init version should not require VertexListGraph dgregor 732 Johnson All-Pairs needs better "no path" information dgregor 733 Numbered headers don't work with "preferred" syntax dgregor 735 Fruchterman-Reingold grid performance can be improved dgregor 736 Const correctness violation dgregor 738 Memory leaks with signal::connect? dgregor 829 Implicit graph not implement dgregor 852 Problem with Boost and GCC 4.1 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 1651 incorrect typedefs in examples djowel 1763 wrong AST when parser_tag==0 djowel 1764 wrong AST when parser_tag==0 djowel 1844 Quickbook matches forward slashes (for italics) with slashes in links djowel 1864 [Documentation]There is no documentation for repetivive_view djowel 1872 [Spirit2] 'assignment operator could not be generated' warnings from VC9 djowel 1891 quickbook executable receives <dependency> djowel 1892 boost::spirit::static_ causes link error (using wave) djowel 1893 Documentation Corrections to map.html djowel 1894 fusion\support\tag_of.hpp_ boost::fusion::traits dlwalker 613 boost/crc.hpp uses non-standard conforming syntax 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 garcia 1741 Review schedule out of date gmelquio 1886 Typo in Interval documentation grafik 1041 Cygwin requires PATH setting. grafik 1322 trac rejects patch attachment as spam grafik 1406 Understanding the Tables outdated 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 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 1753 Python docs: bad link to the Jamroot grafik 1771 Statechart TOC mangled. grafik 1776 Documentation page renders incorrectly in Safari 3.1 on OS X 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 jano_gaspar 1852 copy constructor does not copy capacity 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 1446 POSIX API doesn't use C locale johnmaddock 1451 error: use of C99 long long integer constant johnmaddock 1863 Boost.Regex unstable with Borland Turbo C++ 2006 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 1798 met an error using boost::tokenizer in multi-times in vs2005_ unicode jsiek 1888 Why doesn't InputIterator require that reference is convertible to value_type? 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 1854 Interval is not available as a component in the SVN system matias 1822 header dependency in boost/serialization/map.hpp nasonov 1220 lexical_cast requires RTTI nasonov 1704 [any] 4512 warning from VC8/9 on warning level 4 nasonov 1847 Can't compile without <locale> header_ boost::lexical_cast problem 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 nesotto 1795 [ptr_container] minor documentation typo nesotto 1842 boost::sub_rage::front error 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 1856 minstd_rand returning different values in 1.35.0 than in 1.34.1 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 pavol_droba 1827 String algorithm composite header doesn't include join 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 1807 boost::archive::xml_archive_exception does not store error code and reports wrong message text ramey 1812 Boost.Serialization fails to build on Cygwin ramey 1823 Archive concept: Incomplete description? ramey 1824 serialization keeps using wchar_t if BOOST_NO_STD_WSTRING is set ramey 1836 bug in serializing wide character strings ramey 1837 Base class missed in binary_wiarchive ramey 1849 Deserialization of std::string overwrites non-copied contents. ramey 1857 IA64_ GCC 4.3_ redefinition of 'struct boost::serialization::implementation_level<std::vector<long int_ std::allocator<long int> > >' ramey 1877 Documentation Corrections - Archive Concepts rogeeff 1383 signal.h features not found on Mac OS rogeeff 1542 [test] compiler errors when building with stdcxx library rogeeff 1644 Boost.Test missing documentation file BOOST_CHECK_CLOSE_FRACTION.html rogeeff 1676 Dead links on Boost.Test example documentation. 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 1839 Test fails if child process exits with non-zero code rogeeff 1866 Typos in Boost Test documentation rogeeff 1869 Typo in Unit Test Framework documentation samuel_krempp 1699 Compile warning about initialization order. samuel_krempp 1801 Typo in documentation. 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 troyer 1774 serialization: file written with 1.34.1 can't be read in with 1.35 troyer 1778 Possible regression in 1.35 serialization of 2D arrays 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 turkanis 1727 Sample code in documentation does not compile_ has namespace errors. turkanis 1870 zlib_base function names must differ from their zlib counterpart turkanis 1875 Boost.Iostreams warnings with GCC -Wall -W -std=c++98 -pedantic turkanis 1896 boost::iostreams::gzip_decompressor silently ignores multiple members 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 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 1809 Allow empty values in conf file vladimir_prus 1816 --build-type=complete broken in current svn vladimir_prus 1880 documentation bug 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 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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[Math/nextafter] A question of naming functions...
by John Maddock 06 May '08

06 May '08

Folks I'm looking for some good names for some functions I'm on the brink of adding to Boost.Math (all in namespace boost::math::): T nextafter(T val, T dir) Returns the next representable floating point value to "val" in the direction of "dir". This name is basically fixed, since it's the one that C99 uses. T next_greater(T val) Returns the next representable value greater than "val". T next_less(T val) Returns the next representable value less than "val". T edit_distance(T a, T b) Returns the number of floating point representations between values a and b. So the questions are: can you think of any better names, or are these OK? And should edit_distance return a signed or absolute value? Thanks in advance, John.

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Attn: BoostCon Attendees interested in C++0x
by Douglas Gregor 06 May '08

06 May '08

For those interested in attending the "Implementing a mini Boost.Fusion using C++0x" workshop, we suggest that you install a compiler capable of handling some of the C++0x features discussed today, especially decltype, variadic templates, and rvalue references. GCC 4.3 is one such option. For Windows users: MINGW is the fastest way to get GCC 4.3. Here are the steps: 1) Download the automated installer for MINGW, here: http://sourceforge.net/project/showfiles.php? group_id=2435&package_id=240780 When running the installer, you only need to install the "minimal" set of files. 2) Download the "core" and "g++" GCC 4.3.0 binaries from here: http://www.tdragon.net/recentgcc/ 3) Unzip the two files over top of your MINGW distribution, which replaces the default (ancient) compiler with GCC 4.3. 4) Try to compile a simple problem, e.g., "static_assert(false, "It works!");" with c:\mingw\bin\g++ -std=c++0x foo.cpp For Mac users: MacPorts has a version of GCC 4.3, which should be installable with: sudo port install gcc43 Fink also has a version of GCC 4.3 in the unstable distribution. Once you've configured for the unstable distribution, use: fink install gcc43 For Linux users: You can build GCC 4.3 on your own (get the source at gcc.gnu.org) or perhaps be lucky enough to find a binary for your particular distribution. - Doug

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C++ Memory Management Innovation: GC Allocator
by shiwei xu 06 May '08

06 May '08

Most of the C++ programmers do not benefit from "Garbage Collection" technique (GC). They are sick of deleting objects but have to do this. There are some C/C++ memory GC implementations, but they are complex and are not widely used. I am going to introduce a new memory management technique named "GC Allocator". "GC Allocator" isn't an implementation, but a concept. Now, we have two "GC Allocator" implementations, named "AutoFreeAlloc" and "ScopeAlloc". This article consists of three parts: 1. What is GC Allocator? 2. GC Allocator implementations: ScopeAlloc and AutoFreeAlloc 3. Applications based on GC Allocator For more information, see http://www.codeproject.com/KB/cpp/gc-allocator.aspx To obtain a copy of this paper in pdf format click here<http://xushiwei.com/local--files/gc-allocator/GCAllocator.pdf>(or from google code <http://code.google.com/p/stdext/downloads/list>).

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