May 2006 - Boost - lists.boost.org

TR2 and C++0x heads up
by Beman Dawes 23 Sep '06

23 Sep '06

The C++ standards committee's Library Working Group has proposed a schedule for library changes and extensions: * October 2005: cutoff date for C++0x major library proposals * October 2006: cutoff date for library TR2 proposals * April 2007: cutoff date for C++0x library clean-up papers The usual rule-of-thumb is that new library components go in TR2, while changes to existing components go in C++0x. The LWG will consider exceptions to the rule on a case-by-case basis. The LWG is planning to issue a "Call for Proposals" with details, but in the meantime Boost developers might want to start thinking about which Boost libraries they want to propose to the LWG. Because most proposals go through one or more revisions before being accepted, it helps a proposal's chances if it reaches the committee as many meetings as possible before the final cut-off. So far there are plans to propose Boost.Threads, Boost.Filesystem, and Boost.Signals. As well as proposals for some of the more major libraries, I personally hope someone will do a sweep through Boost looking at some of the smaller utilities and helpers for a possible "Small Additions" proposal. --Beman

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[shared_Ptr] [1.34] URGENT: Outstanding HP-UX / itanium bug
by John Maddock 12 Sep '06

12 Sep '06

Folks we still haven't solved the outstanding issue summarised here: http://lists.boost.org/boost-users/2005/12/15692.php Defining BOOST_SP_USE_PTHREADS is at least a workaround. Should I apply this to Boost.Config or should the sp_counted_base.hpp logic be altered (to keep everything in one place)? Or does anyone believe they have a fix for the assembly code in time for 1.34? Thanks, John.

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boost::scoped_array::release?
by Ralf W. Grosse-Kunstleve 30 Aug '06

30 Aug '06

Does this patch for boost/scoped_array.hpp look useful? < T * release() // never throws < { < T * result = ptr; < ptr = 0; < return result; < } < It allows me to use boost::scoped_array almost like an auto_ptr: int* foo(size) { boost::scoped_array<int> result(new int[size]); // do something to result // if an exception is thrown result will be cleaned up return result.release(); } void bar() { boost::scoped_array<int> foo_result(foo(1000)); // code is still exception safe } I wouldn't need this if - we had std::auto_array (don't think it exists) - std::vector<int>(size) wouldn't do the default construction of all elements and I didn't care about having two pointers instead of just one (sometimes I actually do care) - boost::scoped_array::ptr was protected instead of private so that I could inherit and add release() Are there arguments for not adding release()? Cheers, Ralf __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Boost regression notification (2005-10-26 [RC_1_33_0])
by Douglas Gregor 23 Aug '06

23 Aug '06

Boost regression test failures ------------------------------ Report time: 2005-10-26T14:54:08Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-RC_1_33_0/developer/i… 82 failures in 3 libraries: parameter (1) range (3) serialization (78) |parameter| tutorial: gcc-2.95.3-linux |range| array: vc-6_5 vc-6_5-stlport vc-7_0 |serialization| test_class_info_load_binary_archive: borland-5_6_4 cw-8_3 cw-9_4 cw-9_5-darwin gcc-3_4_3-sunos mingw-3_4_2 vc-6_5 vc-7_0 test_class_info_load_binary_archive_dll: borland-5_6_4 cw-9_4 cw-9_5-darwin gcc-3_4_3-sunos intel-win32-8_1 mingw-3_4_2 vc-6_5 vc-7_0 test_class_info_load_text_archive: borland-5_6_4 cw-8_3 cw-9_4 gcc-3_4_3-sunos mingw-3_4_2 vc-6_5 vc-7_0 test_class_info_load_text_archive_dll: borland-5_6_4 cw-9_4 gcc-3_4_3-sunos intel-win32-8_1 mingw-3_4_2 vc-6_5 vc-7_0 test_class_info_load_text_warchive: borland-5_6_4 cw-8_3 cw-9_4 gcc-3_4_3-sunos vc-7_0 test_class_info_load_text_warchive_dll: borland-5_6_4 cw-9_4 gcc-3_4_3-sunos intel-win32-8_1 vc-7_0 test_class_info_load_xml_archive: borland-5_6_4 cw-8_3 cw-9_4 cw-9_5-darwin gcc-3_4_3-sunos mingw-3_4_2 vc-6_5 vc-7_0 test_class_info_load_xml_archive_dll: borland-5_6_4 cw-9_4 cw-9_5-darwin gcc-3_4_3-sunos intel-win32-8_1 mingw-3_4_2 vc-6_5 vc-7_0 test_class_info_load_xml_warchive: borland-5_6_4 cw-8_3 cw-9_4 gcc-3_4_3-sunos vc-6_5 vc-7_0 test_class_info_load_xml_warchive_dll: borland-5_6_4 cw-9_4 gcc-3_4_3-sunos intel-win32-8_1 vc-6_5 vc-7_0 test_demo_xml_load: borland-5_6_4 gcc-3_4_3-sunos gcc-4_0-darwin intel-win32-8_1 mingw-3_4_2 test_demo_xml_load_dll: borland-5_6_4 gcc-3_4_3-sunos gcc-4_0-darwin mingw-3_4_2 test_shared_ptr_132_text_warchive: intel-win32-8_1

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bind/lambda/phoenix and result_of
by David Abrahams 02 Aug '06

02 Aug '06

One happy day, we'll have auto and decltype... Until then, we have no reasonable way to declare the type of bind expressions. So I got to thinking, maybe something like this could be made to work: result_of<bind_(std::minus<int>, int, _1_)>::type f = bind(std::minus<int>(), 3, _1); For lambda, I guess we could do something like this: result_of<minus_(int, _1_)>::type f = 3 - _1; Does this direction make sense? -- Dave Abrahams Boost Consulting www.boost-consulting.com

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Low-level precision timer proposal
by Silex 25 Jul '06

25 Jul '06

Hello, Currently there's boost::timer which is a timer based on std::clock(). While this might be sufficient for many people, some want low-level resolution timers. I made a QueryPerformanceCounter() / gettimeofday() wrapper that allows portable millisecond resolution. You'll find attached a basic sample of my trivial work. I tried to make it so inclusion in boost is straight-forward. To see it in action : -Copy the precise_timer* hpp files into the boost directory. -Compile main.cpp & execute it. Would boost be interested by including this class in boost::timer ? I'm all ear for your suggestions / bugs / whatever fits it :) This is the 1st time I propose something to boost so there's probably things to be said on the implementation details (files structure, #ifdef strategy etc) so don't hesitate to tell what should be changed. I also can make that if on windows QueryPerformanceCounter() fails because there's no low-level resolution timer available it uses timeGetTime() instead. But that'd require linking to winmm.lib which could be a problem ( and I never saw a win32 machine where QueryPerformanceCounter() didn't work ). I just thought that I could also rename it to lowres_timer instead of precise_timer, it's more accurate, what do you think ? Regards, Philippe Vaucher

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Random Access to Files (RAF) - any interest ?
by Slava, Alex 13 Jul '06

13 Jul '06

Dear Boost Community, Is there any interest in submission of a Random Access to Files (RAF) Library to Boost? Please see http://www.trukhanov.kiev.ua/RAF/ for documentation and an initial implementation. Thank you, -- Svyatoslav Trukhanov, Oleksii Ursulenko

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Patch for smart pointers assignation of plain pointers
by Pierre THIERRY 15 Jun '06

15 Jun '06

It seems to me that smart pointers could have the same semantics that plain pointers have (it's also the orientation taken by other smart pointers, like those in Glibmm). Here is my proposed patch against CVS HEAD: Index: boost/scoped_ptr.hpp =================================================================== --- boost/scoped_ptr.hpp.orig +++ boost/scoped_ptr.hpp @@ -101,6 +101,12 @@ return *this; } + scoped_ptr & operator=(T * rhs) + { + this_type(rhs).swap(*this); + return *this; + } + T * get() const // never throws { return ptr; Index: boost/shared_ptr.hpp =================================================================== --- boost/shared_ptr.hpp.orig +++ boost/shared_ptr.hpp @@ -246,6 +246,12 @@ #endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION + shared_ptr & operator=(T * r) + { + this_type(r).swap(*this); + return *this; + } + #endif // BOOST_NO_AUTO_PTR #if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300) Regards, Nowhere man -- nowhere.man(a)levallois.eu.org OpenPGP 0xD9D50D8A

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boost::typeof, MSVC7.1 & 8.0, and precompiled headers
by Bertrand Augereau 10 Jun '06

10 Jun '06

Hello to all, I just wanted to let you know that boost::typeof doesn't work (in today CVS) when included in a precompiled header with recent MSVC, because of a (seemingly common in other boost libs) anonymous-namespace error. I'm waiting for boost::typeof to work like a charm in MSVC8 so that I can ditch the evil-hack MSVC7 typeof implementation and migrate to MSVC8 :) Thanks, Bertrand PS : Arkadiy, I took the liberty to CC you because you were the one who pointed me to boost::typeof on clc++m and you seem to be in charge for this :)

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[serialization] BCB2006 support
by Nicola Musatti 10 Jun '06

10 Jun '06

Hallo, Robert. I eventually setup a test environment where I can run tests from both BCB6 and BCB2006, and I'm currently looking into test_delete_pointer's failure. I still see the problem I mentioned a while ago where boost::archive::version_type is being written out as a bool, even though this is not the main problem. What causes the test to fail is bpis_ptr being NULL at line 485 in basic_iarchive.cpp: if(! tracking){ bpis_ptr->load_object_ptr(ar, t, co.file_version); This call obviously generates an access violation. I've yet to figure out why. Any suggestion is welcome :-) Cheers, Nicola Musatti

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