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[Review Request] Multiprecision Arithmetic Library
by John Maddock 10 Apr '12

10 Apr '12

Folks, I'd like to ask for a formal review of the Multiprecision Arithmetic Library, currently in the sandbox. Features: * Expression template enabled front end. * Support for Integer, Rational and Floating Point types. Supported Integer backends: * GMP. * Libtommath. * cpp_int. cpp_int is an all C++ Boost licensed backend, supports both arbitrary precision types (with Allocator support), and signed and unsigned fixed precision types (with no memory allocation). There are also some integer specific functions - for Miller Rabin testing, bit fiddling, random numbers. Plus interoperability with Boost.Rational (though that loses the expression template frontend). Supported Rational Backends: * GMP * libtommath * cpp_int (as above) Supported Floating point backends: * GMP * MPFR * cpp_dec_float cpp_dec_float is an all C++ Boost licensed type, adapted from Christopher Kormanyos' e_float code (published in TOMS last year). All the floating point types, have full std lib support (cos sin exp, pow etc), as well as full interoperability with Boost.Math. There's nothing in principal to prevent extension to complex numbers and interval arithmetic types (plus any other number types I've forgotten!), but I've run out of energy for now ;-) Code is in the sandbox under /big_number/. Docs can be viewed online here: http://svn.boost.org/svn/boost/sandbox/big_number/libs/multiprecision/doc/h… And of course, I'm looking for a review manager ;-) Many thanks, John.

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[config] unexpected explicit operators conversion on some compilers.
by Vicente J. Botet Escriba 10 Apr '12

10 Apr '12

Hi, Given the following explicit bool conversion template<typename Mutex> class unique_lock { public: explicit operator bool() const BOOST_NOEXCEPT I was expecting the following code to compile fail (note the int cast) boost::unique_lock<boost::mutex> lk0; int i = int(lk0); It fails with gcc-4.7.0, but compile with gcc-4.6.2 and clang-3.0 (I have not tested yet with msvc). When BOOST_NO_EXPLICIT_CONVERSION_OPERATORS is defined I use the bool safe idiom to emulate the conversion #if defined(BOOST_NO_EXPLICIT_CONVERSION_OPERATORS) typedef void (unique_lock::*bool_type)(); operator bool_type() const BOOST_NOEXCEPT; bool operator!() const BOOST_NOEXCEPT; #else explicit operator bool() const BOOST_NOEXCEPT; #endif and in this case the compile fail as desired. Do we need a new macro to state that even if explicit operators are provide, there are some unexpected conversions that could be introduced? Best, Vicente

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Release branch open for new libraries?
by Marshall Clow 10 Apr '12

10 Apr '12

When will the release branch be open for new libraries (for 1.50)? The calendar on Boost.org shows no dates for 1.50 at all. Thanks! -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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[test] SIGSEGV on simple test when -ansi is set with gcc-4.7.0 on Darwin
by Vicente J. Botet Escriba 10 Apr '12

10 Apr '12

Hi, The following simple test signals SIGSEGV when line ***1 is uncommented. When I recompile Boost.Test and the tests with same project requirements (see below) everything is OK. Is this the correct behavior? Should -ansi be set in a coherent way? Note. I have no issue mixing -ansi with clang-3.0. Thanks, Vicente P.S. I could attach the complete logs if needed (not so big) ============================= #include <boost/test/unit_test.hpp> void test_1() { BOOST_CHECK(true); } boost::unit_test::test_suite* init_unit_test_suite(int, char*[]) { boost::unit_test::test_suite* test = BOOST_TEST_SUITE("test suite"); test->add(BOOST_TEST_CASE(test_1)); test->add(BOOST_TEST_CASE(test_1)); test->add(BOOST_TEST_CASE(test_1)); test->add(BOOST_TEST_CASE(test_1)); test->add(BOOST_TEST_CASE(test_1)); //test->add(BOOST_TEST_CASE(test_1)); // *** 1 return test; } ============================= Here it is the log ============================= darwin.link ../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi "/usr/local/gcc-4-7-svn/bin/g++" -o "../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi" "../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi.o" "../../../bin.v2/libs/test/build/darwin-4.7.0x/debug/link-static/libboost_unit_test_framework.a" -g testing.capture-output ../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi.run "../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi" > "../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi.output" 2>&1 status=$? echo >> "../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi.output" echo EXIT STATUS: $status >> "../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi.output" if test $status -eq 0 ; then cp "../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi.output" "../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi.run" fi verbose=0 if test $status -ne 0 ; then verbose=1 fi if test $verbose -eq 1 ; then echo ====== BEGIN OUTPUT ====== cat "../../../bin.v2/libs/thread/test/test_ansi.test/darwin-4.7.0x/debug/test_ansi.output" echo ====== END OUTPUT ====== fi exit $status ====== BEGIN OUTPUT ====== Running 6 test cases... unknown location:0: fatal error in "test_1": signal: SIGSEGV, si_code: 0 (memory access violation at address: 0x00000000) test_ansi.cpp:5: last checkpoint *** 1 failure detected in test suite "Master Test Suite" ============================= Here there are the client project requirements ============================= project : requirements <warnings>all <toolset>darwin:<cxxflags>-ansi ;

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forgot svn password
by Jeffrey Lee Hellrung, Jr. 10 Apr '12

10 Apr '12

Okay, given that my boost SVN account is relatively new, and I hadn't logged in for a while, hopefully it's not too unbelievable that I've forgotten my password. Embarrassing, yes. What to do? I could not find any password recovery or reset options from svn.boost.org. username = jeffrey.hellrung Thanks, and sorry for the noise, - Jeff

2 1

[scope_exit] trunk tests fail on sun compiler
by lcaminiti 09 Apr '12

09 Apr '12

Hello all, I'm trying to get ScopeExit to work on Sun. 1) First it looked like all tests fail on this compiler: http://www.boost.org/development/tests/trunk/developer/scope_exit.html 2) However, I installed Solaris Studio 12.3 on my Ubuntu 10 and it seems that I can compile ScopeExit just fine with the following" $ CC -I /usr/include/i386-linux-gnu/ -I ../../.. -DBOOST_TYPEOF_EMULATION world_seq.cpp Note that: a) Sun does not support variadic macros so only ScopeExit sequence syntax will work. b) Sun does not support native type-of so BOOST_TYPEOF_EMULATION needs to be defined. Therefore, all original ScopeExit type-of emulation tests named `emulation_...` should compile (because they use the sequence syntax and define BOOST_TYPEOF_EMULATION). However, they fail... why? 3) Why when I click on the "fail" link for these tests I get no information on the Sun compiler's output? For example: http://www.boost.org/development/tests/trunk/developer/output/Sandia-sun-bo… If I follow this link I get "Error extracting file: No matching files were found.". What does this mean? Thanks a lot! --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-scope-exit-trunk-tests-fail-on-sun… Sent from the Boost - Dev mailing list archive at Nabble.com.

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Metaprogram benchmarks
by Dave Abrahams 09 Apr '12

09 Apr '12

In order to measure the compile-time efficiency of various C++11 metaprogramming techniques, I'd like to put together a set of benchmarks, and I wanted to discuss here what kinds of tests might be appropriate. Aleksey and I came up with some benchmarks for an appendix to http://boostpro.com/mplbook/, but some of those are lost and they're all getting a bit crusty. Certainly, I have no confidence that they are realistic or useful. If anyone has ideas about this, I'd be very glad to hear them. Thanks in advance, -- Dave Abrahams BoostPro Computing http://www.boostpro.com

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[string_algo] ilexicographical_compare()/is_iless() bug?
by Dmitry Vinogradov 08 Apr '12

08 Apr '12

I want to share a problem using ilexicographical_compare(). I think that ilexicographical_compare() must compare two strings in "alphabetical" order, the order letters appear in alphabet. But ilexicographical_compare() uses is_iless() to compare letters. And such comparison looks like: std::toupper<T1>(Arg1,m_Loc)<std::toupper<T2>(Arg2,m_Loc); So, in fact, letters are compared depending on their position in a charset. It's not always match the alphabet order. Examples are Cyrillic letters "Io" and "i" (Unicode 0451 and 0456). I think the right solution is to compare like this: T1 Ch1 = std::toupper<T1>(Arg1,m_Loc); T2 Ch2 = std::toupper<T2>(Arg2,m_Loc); return std::use_facet< std::collate<typename CharType> > (m_Loc).compare(&Ch1, &Ch1 + 1, &Ch2, &Ch2 + 1);

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[SVN] Spurious changes to lots of files....
by John Maddock 08 Apr '12

08 Apr '12

I'm not picking on anyone in particular here, just noticing that some stuff that really shouldn't have changed is quite often getting "touched" due to changes to svn:mergeinfo. For example, if I look at the revision log for boost/config.hpp in the release branch I see: Revision: 77591 Author: eric_niebler Date: 27 March 2012 20:28:30 Message: merge [77416] from trunk, fixes #6131, fixes #6455 Revision: 77589 Author: eric_niebler Date: 27 March 2012 19:53:50 Message: merge [77417],[77437],[77422],[77587] from trunk ---- Revision: 77447 Author: eric_niebler Date: 21 March 2012 04:22:38 Message: merge [77446] from trunk ---- Revision: 77420 Author: eric_niebler Date: 19 March 2012 21:33:14 Message: merge [77419] from trunk ---- Revision: 77413 Author: eric_niebler Date: 19 March 2012 20:26:44 Message: merge [77412] from trunk, fixes #6702 ---- Revision: 77411 Author: eric_niebler Date: 19 March 2012 20:07:11 Message: merge [77320] from trunk ---- Revision: 76784 Author: eric_niebler Date: 29 January 2012 21:58:13 Message: merge [76637] from trunk ---- Revision: 76536 Author: jewillco Date: 15 January 2012 23:52:45 Message: Merged r75066, r75067, r75124, r75140, r75165, r75861, r75862, r75863, r75878, r75906, r75970, r75973, r75974, and r76394 from trunk ---- Revision: 76535 Author: jewillco Date: 15 January 2012 23:32:09 Message: Merged r76050, r75547, r75891, r76049, r76083, and r76439 from trunk (reverse_graph bug fixes and fix for #6293); refs #6293 ---- Revision: 76480 Author: eric_niebler Date: 14 January 2012 05:21:11 Message: merge [76479] from trunk ---- Before finally we get to a "real" change: Revision: 76339 Author: johnmaddock Date: 07 January 2012 17:29:04 Message: Merge config changes from Trunk. ---- If we pick out the latest of the changes above we see that a huge number of files have been "touched" in this way: Revision: 77591 Author: eric_niebler Date: 27 March 2012 20:28:30 Message: merge [77416] from trunk, fixes #6131, fixes #6455 ---- Modified : /branches/release Modified : /branches/release/INSTALL Modified : /branches/release/Jamroot Modified : /branches/release/LICENSE_1_0.txt Modified : /branches/release/boost 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/branches/release/status/Jamfile.v2 Modified : /branches/release/status/expected_results.xml Modified : /branches/release/status/explicit-failures-markup.xml Modified : /branches/release/status/explicit-failures.xsd Modified : /branches/release/tools Modified : /branches/release/tools/bcp Modified : /branches/release/tools/boostbook Modified : /branches/release/tools/build/v2 Modified : /branches/release/tools/build/v2/tools/mpi.jam Modified : /branches/release/tools/inspect Modified : /branches/release/tools/quickbook Modified : /branches/release/tools/regression Modified : /branches/release/tools/regression/src/library_status.cpp Modified : /branches/release/tools/release Modified : /branches/release/tools/wave As well as cluttering up the revision logs, this often leads to property and/or tree conflicts when merging your own stuff, and I can't tell you how annoying that is to figure out! :-( BTW, my sincere apologies to Eric here - he just happened to be the latest culprit - can some SVN guru suggest how to prevent this sort of spurious changing going on? BTW2, lest this turn into "my extra advanced version control system doesn't do messy stuff like this" conversation - I'm sure you're correct - some other version control system probably doesn't have this trap - but I sure bet it has other traps just as annoying for the unwary. Just saying.... Thanks, John.

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C++ Now! Early Bird Registration Ending Soon
by Jon Kalb 08 Apr '12

08 Apr '12

The fifteenth of this month is the end of Early Bird registration. Register by the end of next week to reserve your place and save on registration. Featuring 3 keynote speakers headlining 3 tracks of 50+ session brought to by 35+ presenters, this year¹s conference is our largest and most ambitious. What isn¹t bigger is the registration fee. If you beat the April 15th deadline you can enjoy the conference offering the most complete C++11 tutorial coverage of the year and save money too. See you in Aspen! Registration: http://cppnow.eventbrite.com/?ref=ecount Jon

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