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Two days left to save on BoostCon / C++Now! 2012
by Dave Abrahams 11 Apr '12

11 Apr '12

Just a quick reminder to everyone that early-bird registration closes at the end of this week. After Friday, the price goes up by $100. Spots are limited and registrations have been coming in faster than in past years. http://cppnow.org Cheers! -- Dave Abrahams BoostPro Computing http://www.boostpro.com

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[range] adaptors vs. rvalue to lvalue& binding
by Arno Schödl 11 Apr '12

11 Apr '12

Hello, ideally I would like to use range-adapted lvalue ranges like any other lvalue ranges. Writing it down naively, as below, does not compile because LoadRefRange takes (and should take?) the range it modifies by lvalue&, while adaptor expressions are rvalues. template<typename Range> void modifies_range( Range& rng ); A a[5]; main() { // modifies all elements of a modifies_range ( a ); // modifies all elements (except for one) of a // adaptor is rvalue, does not compile: modifies_range ( boost::range::join( boost::adaptors::slice( a, 0, 1 ), boost::adaptors::slice( a, 2, countof(a) ) ) ); // compiles, but ugly: auto rng=boost::range::join( boost::adaptors::slice( a, 0, 1 ), boost::adaptors::slice( a, 2, countof(a) ) ); modifies_range(rng); } Any thoughts? Should adaptors receiving lvalues offer an operator adaptor&() &&; // overload on rvalue-ness so they are passing through the lvalue or their argument? A suitable baseclass a la boost::additive could do that. Regards, Arno -- Dr. Arno Schödl | aschoedl(a)think-cell.com Technical Director think-cell Software GmbH | Chausseestr. 8/E | 10115 Berlin | Germany http://www.think-cell.com | phone +49 30 666473-10 | US phone +1 800 891 8091 Amtsgericht Berlin-Charlottenburg, HRB 85229 | European Union VAT Id DE813474306 Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl

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[function] why do I function1 for type-of emulation?
by lcaminiti 10 Apr '12

10 Apr '12

Hello all, I was trying to use Boost.Function together with Boost.Typeof. It seems that if I run in type-of emulation mode I have to register boost::functionN instead of boost::function even if I only use boost::function... do you know why? For example: #include <boost/function.hpp> #include <boost/typeof/typeof.hpp> #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP() //BOOST_TYPEOF_REGISTER_TEMPLATE(boost::function, 1) // (1) BOOST_TYPEOF_REGISTER_TEMPLATE(boost::function1, 2) // (2) int main() { typedef BOOST_TYPEOF(&boost::function<int (int)>::operator()) f; return 0; } In order to compile this (on MSVC 8.0 and GCC 4.5.3) with BOOST_TYPEOF_EMULATION #defined, I have to register boost::function1 as in line (2) but I'd expect it to work with the registration of boost::function of line (1) instead. Why do I have to register boost::function1 (2) instead of boost::function (1) for type-of emulation? Thanks a lot. --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-function-why-do-I-function1-for-ty… Sent from the Boost - Dev mailing list archive at Nabble.com.

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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

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[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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