October 2013 - Boost - lists.boost.org

[winapi] Default target Windows version
by Andrey Semashev 27 Oct '13

27 Oct '13

Hi, First, a little intro. As part of ongoing work on Boost.Sync we've created quite a few headers with WinAPI declarations that are often needed in Boost libraries. The headers are in boost/detail/winapi and can be used by any library that wishes to avoid including windows.h. The headers declare some symbols that depend on the target Windows version. For example, GetTickCount64 only appeared in Windows Vista. The user can define BOOST_USE_WINAPI_VERSION macro before including any Boost headers to indicate the target WinAPI version Boost should use. If the macro is not defined, the headers attempt to deduce the target Windows version from the _WIN32_WINNT and WINVER macros, if they are defined by the user. Lastly, if everything fails, the headers fall back to a default, which is currently Windows XP. I wanted to ask the community if it is appropriate to raise the default to Windows Vista. The rationale for this is that Vista introduced a lot of useful APIs (in thread synchronization, in particular) and XP is losing its popularity and soon will be completely unsupported by Microsoft. Also, I'm not sure what is the current state of affair, but Microsoft already tried to drop pre-Vista targets in MSVC. Note that I'm not suggesting to drop support for pre-Vista Windows. The user will still be able to enable previous versions of WinAPI in one of the mentioned above ways. Lastly, I'd like to encourage Boost developers to use this protocol for defining WinAPI version used by libraries. It would be ideal if by defining BOOST_USE_WINAPI_VERSION the user would be able to control WinAPI version used by all Boost libraries, not just Boost.Sync and Boost.Chrono (the current users of these headers). If you want to add support for this protocol to your library, simply include boost/detail/winapi/config.hpp. This will result in BOOST_USE_WINAPI_VERSION being defined so that it can be checked by the library. Other headers boost/detail/winapi make use of this macro, you can see them as an example.

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Re: [boost] [voronoi]medial axis
by Michael Simbirsky 27 Oct '13

27 Oct '13

Thanks, Andrii, Louis, Like Louis, I try to use Boost.Polygon Voronoi diagram for medial axis computation. Since Voronoi diagram is stored as DCEL, it is not difficult to represent it as a combination of two dual graphs. The "primal" bidirected graph has Voronoi vertices as its vertices and (finite) halfedges as edges. The "dual" graph has Voronoi cells as its vertices; half-edges "connect" adjacent cells. This graph is also bi-directed. I think this understanding of DCEL is rather common; I believe CGAL applies similar approach to provide Boost Graph adapters for its DCEL arrangements. For my purposes I am writing the adapters on my own. Iterator parts are straight-forward. For efficiency it is also useful to convert some internals into "property maps". For example, color map is already provided, one has only to wrap it into boost::property_map with correct access functions. Similarly, the fact that vertices are packed into continuous storage gives us an efficient "vertex to integer" bimap, an important ingredient for many search algorithms from Boost Graph library. As the next step I hope to implement your discussion on vertices connected to infinity, vertices in holes etc.using Boost.Graph. Andrii, I would be glad to share this code with you and Boost.Polygon users. Thanks, -Michael

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[release] Permission to merge after regression cycle
by Vicente J. Botet Escriba 26 Oct '13

26 Oct '13

Hi, I have been fixing some bugs on Boost.Chrono #9274 <https://svn.boost.org/trac/boost/ticket/9274> lost of precission on system_clock input <https://svn.boost.org/trac/boost/ticket/9274> #9276 <https://svn.boost.org/trac/boost/ticket/9276> output from a system_clock::time_point get a time_point that is one day later than expected <https://svn.boost.org/trac/boost/ticket/9276> #9265 <https://svn.boost.org/trac/boost/ticket/9265> time_point_output_h test crashes regression test <https://svn.boost.org/trac/boost/ticket/9265> #8328 <https://svn.boost.org/trac/boost/ticket/8328> chrono crashes visual studio 2012 regression tests <https://svn.boost.org/trac/boost/ticket/8328> The concerned change sets are 19:00 Changeset /[86410]/ by viboes <https://svn.boost.org/trac/boost/changeset/86410> Thread: Try to fix system_clock::time_point output on windows. 18:01 Changeset /[86384]/ by viboes <https://svn.boost.org/trac/boost/changeset/86384> Chrono: try to avoid the crash with msvc 11 on chrono_io. 17:36 Changeset /[86383]/ by viboes <https://svn.boost.org/trac/boost/changeset/86383> Chrono: set precission to 9 so that there is no lost with the hisgest ... 14:27 Changeset /[86376]/ by viboes <https://svn.boost.org/trac/boost/changeset/86376> Chrono: fix two important issues with Boost.Chrono IO v2 on windows * ... 14:54 Changeset /[86357]/ by viboes <https://svn.boost.org/trac/boost/changeset/86357> Chrono: don't run test_good_utc_fmt_system_clock on windows as this is ... I would like to merge these changeset to release. Is it time to do it before releasing boost 1.55? Best, Vicente Patch: svn diff boost/chrono/detail/inlined/win/chrono.hpp boost/chrono/io/time_point_io.hpp libs/chrono/test/io/time_point_output.cpp libs/chrono/example/io_ex1.cpp Index: boost/chrono/detail/inlined/win/chrono.hpp =================================================================== --- boost/chrono/detail/inlined/win/chrono.hpp (revision 86326) +++ boost/chrono/detail/inlined/win/chrono.hpp (working copy) @@ -109,8 +109,11 @@ { ec.clear(); } - return time_point(duration( - (static_cast<__int64>( ft.dwHighDateTime ) << 32) | ft.dwLowDateTime)); + return system_clock::time_point( + system_clock::duration( + ((static_cast<__int64>( ft.dwHighDateTime ) << 32) | ft.dwLowDateTime) + -116444736000000000LL + )); } #endif Index: boost/chrono/io/time_point_io.hpp =================================================================== --- boost/chrono/io/time_point_io.hpp (revision 86326) +++ boost/chrono/io/time_point_io.hpp (working copy) @@ -28,6 +28,7 @@ #include <boost/chrono/clock_string.hpp> #include <boost/chrono/round.hpp> #include <boost/chrono/detail/scan_keyword.hpp> +#include <boost/static_assert.hpp> #include <boost/detail/no_exceptions_support.hpp> #include <cstring> #include <locale> @@ -46,9 +47,11 @@ { namespace chrono { + typedef double fractional_seconds; namespace detail { + template <class CharT, class InputIterator = std::istreambuf_iterator<CharT> > struct time_get { @@ -758,6 +761,7 @@ { 0,31,59,90,120,151,181,212,243,273,304,334}, { 0,31,60,91,121,152,182,213,244,274,305,335} }; + return days[is_leap(year)][month-1] + day - 1; } @@ -779,7 +783,7 @@ month++; int day = t->tm_mday; int day_of_year = days_from_1jan(year,month,day); - int days_since_epoch = days_from_1970(year) + day_of_year; + int days_since_epoch = days_from_1970(year) + day_of_year ; time_t seconds_in_day = 3600 * 24; time_t result = seconds_in_day * days_since_epoch + 3600 * t->tm_hour + 60 * t->tm_min + t->tm_sec; @@ -801,11 +805,36 @@ return y * 365 + y / 4 - y / 100 + y / 400; } + // Returns year/month/day triple in civil calendar + // Preconditions: z is number of days since 1970-01-01 and is in the range: + // [numeric_limits<Int>::min(), numeric_limits<Int>::max()-719468]. + template <class Int> + //constexpr + void + inline civil_from_days(Int z, Int& y, unsigned& m, unsigned& d) BOOST_NOEXCEPT + { + BOOST_STATIC_ASSERT_MSG(std::numeric_limits<unsigned>::digits >= 18, + "This algorithm has not been ported to a 16 bit unsigned integer"); + BOOST_STATIC_ASSERT_MSG(std::numeric_limits<Int>::digits >= 20, + "This algorithm has not been ported to a 16 bit signed integer"); + z += 719468; + const Int era = (z >= 0 ? z : z - 146096) / 146097; + const unsigned doe = static_cast<unsigned>(z - era * 146097); // [0, 146096] + const unsigned yoe = (doe - doe/1460 + doe/36524 - doe/146096) / 365; // [0, 399] + y = static_cast<Int>(yoe) + era * 400; + const unsigned doy = doe - (365*yoe + yoe/4 - yoe/100); // [0, 365] + const unsigned mp = (5*doy + 2)/153; // [0, 11] + d = doy - (153*mp+2)/5 + 1; // [1, 31] + m = mp + (mp < 10 ? 3 : -9); // [1, 12] + y += (m <= 2); + --m; + } inline std::tm * internal_gmtime(std::time_t const* t, std::tm *tm) { if (t==0) return 0; if (tm==0) return 0; +#if 0 static const unsigned char day_of_year_month[2][366] = { @@ -820,6 +849,7 @@ { -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 }, { -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 } }; +#endif const time_t seconds_in_day = 3600 * 24; int32_t days_since_epoch = static_cast<int32_t>(*t / seconds_in_day); @@ -829,6 +859,7 @@ hms = seconds_in_day+hms; } +#if 0 int32_t x = days_since_epoch; int32_t y = static_cast<int32_t> (static_cast<long long> (x + 2) * 400 / 146097); @@ -843,16 +874,23 @@ //y -= 32767 + 2; y += 70; tm->tm_year=y; - const bool leap = is_leap(y); + const int32_t leap = is_leap(y); tm->tm_mon = day_of_year_month[leap][doy]-1; - tm->tm_mday = doy - days_in_year_before[leap][day_of_year_month[leap][doy] - 1]; + tm->tm_mday = doy - days_in_year_before[leap][tm->tm_mon] ; +#else + int32_t y; + unsigned m, d; + civil_from_days(days_since_epoch, y, m, d); + tm->tm_year=y-1900; tm->tm_mon=m; tm->tm_mday=d; +#endif - tm->tm_hour = hms / 3600; const int ms = hms % 3600; tm->tm_min = ms / 60; tm->tm_sec = ms % 60; + tm->tm_isdst = -1; + (void)mktime(tm); return tm; } @@ -907,6 +945,9 @@ tm = *tmp; #else if (gmtime_r(&t, &tm) == 0) failed = true; + tm.tm_isdst = -1; + (void)mktime(&tm); + #endif } @@ -922,7 +963,7 @@ failed = tpf.put(os, os, os.fill(), &tm, pb, pe).failed(); if (!failed) { - duration<double> d = tp - system_clock::from_time_t(t) + seconds(tm.tm_sec); + duration<fractional_seconds> d = tp - system_clock::from_time_t(t) + seconds(tm.tm_sec); if (d.count() < 10) os << CharT('0'); //if (! os.good()) { // throw "exception"; @@ -932,6 +973,7 @@ //if (! os.good()) { //throw "exception"; //} + os.precision(9); os << d.count(); //if (! os.good()) { //throw "exception"; @@ -1058,12 +1100,8 @@ const std::time_get<CharT>& tg = std::use_facet<std::time_get<CharT> >(loc); const std::ctype<CharT>& ct = std::use_facet<std::ctype<CharT> >(loc); tm tm; // {0} - tm.tm_year=0; - tm.tm_mon=0; - tm.tm_mday=0; - tm.tm_hour=0; - tm.tm_min=0; - tm.tm_sec=0; + std::memset(&tm, 0, sizeof(std::tm)); + typedef std::istreambuf_iterator<CharT, Traits> It; if (pb == pe) { @@ -1079,9 +1117,13 @@ tg.get(is, 0, is, err, &tm, pb, pe); #endif if (err & std::ios_base::failbit) goto exit; - double sec; + fractional_seconds sec; CharT c = CharT(); + std::ios::fmtflags flgs = is.flags(); + is.setf(std::ios::fixed, std::ios::floatfield); + is.precision(9); is >> sec; + is.flags(flgs); if (is.fail()) { err |= std::ios_base::failbit; @@ -1099,13 +1141,14 @@ if (err & std::ios_base::failbit) goto exit; time_t t; + #if BOOST_CHRONO_INTERNAL_TIMEGM t = detail::internal_timegm(&tm); #else t = timegm(&tm); #endif tp = time_point_cast<Duration>( - system_clock::from_time_t(t) - min + round<microseconds> (duration<double> (sec)) + system_clock::from_time_t(t) - min + round<system_clock::duration> (duration<fractional_seconds> (sec)) ); } else Index: libs/chrono/test/io/time_point_output.cpp =================================================================== --- libs/chrono/test/io/time_point_output.cpp (revision 86326) +++ libs/chrono/test/io/time_point_output.cpp (working copy) @@ -148,68 +148,102 @@ using namespace boost::chrono; using namespace boost; - test_good_system_clock("1970-01-01 02:00:00.000000 +0000", hours(2), duration_style::prefix); - test_good_system_clock("1970-01-01 02:00:00.000000 +0000", hours(2), duration_style::symbol); + test_good_system_clock("1970-01-01 02:00:00.000000000 +0000", hours(2), duration_style::prefix); + test_good_system_clock("1970-01-01 02:00:00.000000000 +0000", hours(2), duration_style::symbol); - test_good_prefix_system_clock("1970-01-01 02:00:00.000000 +0000", hours(2)); - test_good_prefix_system_clock("1970-01-01 00:02:00.000000 +0000", minutes(2)); - test_good_prefix_system_clock("1970-01-01 00:00:02.000000 +0000", seconds(2)); - test_good_prefix_system_clock("1970-01-01 00:00:01.000000 +0000", seconds(1)); - test_good_prefix_system_clock("1969-12-31 23:59:59.000000 +0000", seconds(-1)); - test_good_prefix_system_clock("1970-01-01 00:00:00.000000 +0000", seconds(0)); - test_good_prefix_system_clock("1970-01-01 00:00:00.002000 +0000", milliseconds(2)); - test_good_prefix_system_clock("1970-01-01 00:00:00.000002 +0000", microseconds(2)); - test_good_prefix_system_clock("1970-01-01 00:00:00.000000 +0000", nanoseconds(2)); - test_good_prefix_system_clock("1970-01-01 00:00:00.200000 +0000", duration<boost::int_least64_t, deci> (2)); - test_good_prefix_system_clock("1970-01-01 00:00:00.066667 +0000", duration<boost::int_least64_t, ratio<1, 30> > (2)); + test_good_prefix_system_clock("1970-01-01 02:00:00.000000000 +0000", hours(2)); + test_good_prefix_system_clock("1970-01-01 00:02:00.000000000 +0000", minutes(2)); + test_good_prefix_system_clock("1970-01-01 00:00:02.000000000 +0000", seconds(2)); + test_good_prefix_system_clock("1970-01-01 00:00:01.000000000 +0000", seconds(1)); + test_good_prefix_system_clock("1969-12-31 23:59:59.000000000 +0000", seconds(-1)); + test_good_prefix_system_clock("1970-01-01 00:00:00.000000000 +0000", seconds(0)); + test_good_prefix_system_clock("1970-01-01 00:00:00.002000000 +0000", milliseconds(2)); + test_good_prefix_system_clock("1970-01-01 00:00:00.000002000 +0000", microseconds(2)); + test_good_prefix_system_clock("1970-01-01 00:00:00.000000002 +0000", nanoseconds(2)); + test_good_prefix_system_clock("1970-01-01 00:00:00.200000000 +0000", duration<boost::int_least64_t, deci> (2)); + test_good_prefix_system_clock("1970-01-01 00:00:00.066666667 +0000", duration<boost::int_least64_t, ratio<1, 30> > (2)); - test_good_symbol_system_clock("1970-01-01 02:00:00.000000 +0000", hours(2)); - test_good_symbol_system_clock("1970-01-01 00:02:00.000000 +0000", minutes(2)); - test_good_symbol_system_clock("1970-01-01 00:00:02.000000 +0000", seconds(2)); - test_good_symbol_system_clock("1970-01-01 00:00:00.002000 +0000", milliseconds(2)); - test_good_symbol_system_clock("1970-01-01 00:00:00.000000 +0000", nanoseconds(2)); - test_good_symbol_system_clock("1970-01-01 00:00:00.200000 +0000", duration<boost::int_least64_t, deci> (2)); - test_good_symbol_system_clock("1970-01-01 00:00:00.066667 +0000", duration<boost::int_least64_t, ratio<1, 30> > (2)); + test_good_symbol_system_clock("1970-01-01 02:00:00.000000000 +0000", hours(2)); + test_good_symbol_system_clock("1970-01-01 00:02:00.000000000 +0000", minutes(2)); + test_good_symbol_system_clock("1970-01-01 00:00:02.000000000 +0000", seconds(2)); + test_good_symbol_system_clock("1970-01-01 00:00:00.002000000 +0000", milliseconds(2)); + test_good_symbol_system_clock("1970-01-01 00:00:00.000000002 +0000", nanoseconds(2)); + test_good_symbol_system_clock("1970-01-01 00:00:00.200000000 +0000", duration<boost::int_least64_t, deci> (2)); + test_good_symbol_system_clock("1970-01-01 00:00:00.066666667 +0000", duration<boost::int_least64_t, ratio<1, 30> > (2)); test_good_utc_fmt_system_clock("1970-01-01 02:00:00", "%Y-%m-%d %H:%M:%S", hours(2)); test_good_utc_fmt_system_clock("1970-01-01 02", "%Y-%m-%d %H", hours(2)); - +#if ! defined(BOOST_CHRONO_WINDOWS_API) test_good_utc_fmt_system_clock ("1970-01-01 02:00:00", "%Y-%m-%d %T", hours(2)); test_good_utc_fmt_system_clock ("1970-01-01 02:00", "%Y-%m-%d %R", hours(2)); test_good_utc_fmt_system_clock ("% 1970-01-01 02:00", "%% %Y-%m-%d %R", hours(2)); test_good_utc_fmt_system_clock ("1970-01-01 02:00 Thursday January", "%Y-%m-%d %R %A %B", hours(2)); - +#endif } + +#endif +#if BOOST_CHRONO_VERSION == 2 void test_gmtime(std::time_t t) { std::cout << "t " << t << std::endl; + puts(ctime(&t)); std::tm tm; + std::memset(&tm, 0, sizeof(std::tm)); if (boost::chrono::detail::internal_gmtime(&t, &tm)) { - std::cout << "year " << tm.tm_year << std::endl; - std::cout << "month " << tm.tm_mon << std::endl; - std::cout << "day " << tm.tm_mday << std::endl; - std::cout << "hour " << tm.tm_hour << std::endl; - std::cout << "min " << tm.tm_min << std::endl; - std::cout << "sec " << tm.tm_sec << std::endl; + tm.tm_isdst = -1; + (void)mktime(&tm); + std::tm tm2; + std::memset(&tm2, 0, sizeof(std::tm)); + if (gmtime_r(&t, &tm2)) + { + tm2.tm_isdst = -1; + (void)mktime(&tm2); + + BOOST_TEST_EQ( tm.tm_year , tm2.tm_year ); + BOOST_TEST_EQ( tm.tm_mon , tm2.tm_mon ); + BOOST_TEST_EQ( tm.tm_mday , tm2.tm_mday ); + BOOST_TEST_EQ( tm.tm_hour , tm2.tm_hour); + BOOST_TEST_EQ( tm.tm_min , tm2.tm_min ); + BOOST_TEST_EQ( tm.tm_sec , tm2.tm_sec ); + BOOST_TEST_EQ( tm.tm_wday , tm2.tm_wday ); + BOOST_TEST_EQ( tm.tm_yday , tm2.tm_yday ); + BOOST_TEST_EQ( tm.tm_isdst , tm2.tm_isdst ); + } } + } #endif + int main() { -// test_gmtime( 0 ); -// test_gmtime( -1 ); -// test_gmtime( +1 ); -// test_gmtime( 0 - (3600 * 24) ); -// test_gmtime( -1 - (3600 * 24) ); -// test_gmtime( +1 - (3600 * 24) ); -// test_gmtime( 0 + (3600 * 24) ); -// test_gmtime( -1 + (3600 * 24) ); -// test_gmtime( +1 + (3600 * 24) ); +#if BOOST_CHRONO_VERSION == 2 + test_gmtime( 0 ); + test_gmtime( -1 ); + test_gmtime( +1 ); + test_gmtime( 0 - (3600 * 24) ); + test_gmtime( -1 - (3600 * 24) ); + test_gmtime( +1 - (3600 * 24) ); + test_gmtime( 0 + (3600 * 24) ); + test_gmtime( -1 + (3600 * 24) ); + test_gmtime( +1 + (3600 * 24) ); + test_gmtime( 0 + 365*(3600 * 24) ); + test_gmtime( 0 + 10LL*365*(3600 * 24) ); + test_gmtime( 0 + 15LL*365*(3600 * 24) ); + test_gmtime( 0 + 17LL*365*(3600 * 24) ); + test_gmtime( 0 + 18LL*365*(3600 * 24) ); + test_gmtime( 0 + 19LL*365*(3600 * 24) ); + test_gmtime( 0 + 19LL*365*(3600 * 24)+ (3600 * 24)); + test_gmtime( 0 + 19LL*365*(3600 * 24)+ 3*(3600 * 24)); + test_gmtime( 0 + 19LL*365*(3600 * 24)+ 4*(3600 * 24)); + test_gmtime( 0 + 20LL*365*(3600 * 24) ); + test_gmtime( 0 + 40LL*365*(3600 * 24) ); +#endif + std::cout << "high_resolution_clock=" << std::endl; check_all<boost::chrono::high_resolution_clock> (); #ifdef BOOST_CHRONO_HAS_CLOCK_STEADY @@ -239,6 +273,13 @@ check_all<boost::chrono::process_cpu_clock> (); #endif +#if BOOST_CHRONO_VERSION == 2 + boost::chrono::system_clock::time_point tp = boost::chrono::system_clock::now(); + std::cout << tp << std::endl; + time_t t = boost::chrono::system_clock::to_time_t(tp); + test_gmtime( t ); +#endif + return boost::report_errors(); } Index: libs/chrono/example/io_ex1.cpp =================================================================== --- libs/chrono/example/io_ex1.cpp (revision 86326) +++ libs/chrono/example/io_ex1.cpp (working copy) @@ -53,10 +53,13 @@ << ClockTick(3) + nanoseconds(10) << '\n'; cout << "\nsystem_clock::now() = " << system_clock::now() << '\n'; +#if defined _MSC_VER && _MSC_VER == 1700 +#else #if BOOST_CHRONO_VERSION==2 cout << "\nsystem_clock::now() = " << time_fmt(chrono::timezone::local) << system_clock::now() << '\n'; cout << "\nsystem_clock::now() = " << time_fmt(chrono::timezone::local,"%Y/%m/%d") << system_clock::now() << '\n'; #endif +#endif #ifdef BOOST_CHRONO_HAS_CLOCK_STEADY cout << "steady_clock::now() = " << steady_clock::now() << '\n';

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[type traits] Removal of files broke regression tests
by Beman Dawes 26 Oct '13

26 Oct '13

r68300 removed boost/type_traits/broken_compiler_spec.hpp and boost/type_traits/transform_traits_spec.hpp. Removing the first broke regression tests for iterator, python, and serialization. Removing the second doesn't appear to have done any harm. John Maddock did the r68300 commit. I'm assuming it was in response to Steve Kelly's r86250, "Remove use of obsolete BOOST_TT_BROKEN_COMPILER_SPEC", so the fix may be to remove the #includes that are causing all the errors rather than restoring the file. --Beman

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[fusion] flatten/flatten_view Proposal
by TONGARI J 26 Oct '13

26 Oct '13

Hi there, I've created the ticket, doc&test included https://svn.boost.org/trac/boost/ticket/9294 'flatten' is an algorithm which returns a view that allows you to go through the leaf elems sequentially. For example: flatten(make_vector(1, make_vector(2, 3))) == make_vector(1, 2, 3) This is developed when I use Fusion to work with SQL for simple data mapping. In addition to 'flatten', 'support/ref' is also provided in this patch for working with mutable sequence, which I had talked with Joel sometime ago. BTW, I think the ticket below is OK to close (the patch seem applied): https://svn.boost.org/trac/boost/ticket/8270 Thanks,

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[config] A few headers moved from detail into config module
by Daniel James 25 Oct '13

25 Oct '13

Hi, In case you missed it on the other thread, a few headers have been moved to the config module from detail: boost/version.hpp boost/limits.hpp boost/detail/workaround.hpp Hopefully that isn't a controversial move, but if any of these are a problem, it's just a case of reverting the appropriate changeset in Boost2Git. You can see them at: https://github.com/ryppl/Boost2Git/commits/master Daniel

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[Numeric] Lack Numeric/interval headers for ARM CPU
by christine bouzant 25 Oct '13

25 Oct '13

Hello all, I would need to include the header boost/numeric/interval/hw_rounding.hpp but i see that the ARM CPU is not taken in account. Is someone would have a non official header version for the ARM cpu case ? Thank you! Cheers, Christine

1 0

storing intrusive_ptr in atomic?!
by Oliver Kowalke 25 Oct '13

25 Oct '13

Hello, do you confirm that it is valid to store a intrusive_ptr inside an atomic?! struct X { std::size_t use_count; X() : use_count( 0) {} friend inline void intrusive_ptr_add_ref( X * p) BOOST_NOEXCEPT { ++p->use_count; } friend inline void intrusive_ptr_release( X * p) { if ( 0 == --p->use_count) delete p; } }; X::ptr_t x1( new X() ); X::ptr_t x2( new X() ); boost::atomic< X::ptr_t > av1( x1); BOOST_ASSERT( av1.compare_exchange_strong( x1, x2) ); BOOST_ASSERT( av1.load() != x1); BOOST_ASSERT( av1.load() == x2); A type T used in generic template atomic<T> is required to be trivial copy-able, e.g. I think it is trivial copy-able (std::memcpy) only the use_count will not incremented. The memory layout of intrusive_ptr is a raw-pointer so trivial copy-able should be correct. What do you think? Oliver

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[git] creation of .gitignores
by Jürgen Hunold 25 Oct '13

25 Oct '13

Hi, the converted repository is missing .gitignores. svn provides the ignores patterns in the "svn:ignore" property. The question is: Can those patterns be extracted by the conversion script or shall manually create .gitignores in current svn (patch attached). The third option is to add them after the conversion. Adding (and modifying) the .gitignores during the conversion has the advantage of having .gitignores throughout the whole history instead of only "now". Any comments? Yours, Jürgen -- * Dipl.-Math. Jürgen Hunold ! * voice: ++49 4257 300 ! Fährstraße 1 * fax : ++49 4257 300 ! 31609 Balge/Sebbenhausen * jhunold(a)gmx.eu ! Germany

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[git help] Documenting common modular boost workflows
by Beman Dawes 25 Oct '13

25 Oct '13

I think we need to document simple suggested modular boost workflows. Each workflow could start with the assumption that the steps described in https://svn.boost.org/trac/boost/wiki/TryModBoost have been completed. Workflows might include: 1) Switch to the "develop" branch, fix a minor problem, test, commit, switch back to "master". 2) Same as (1) but also push to remote. 3) Same as (2) but also merge develop to master. 4) Same as (3) but end by submitting a pull request to the boost super-project. I don't mind writing the actual wiki pages, but am a little hobbled by being a TortoiseGit rather than command line git user, and by never having worked with sub-modules. So what would recommended git commands look like for one or more of the above workflows? Thanks, --Beman

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