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[ratio] error in template specialization: template parameter n1 depends on another template parameter
by Krzysztof Czainski 04 Jul '12

04 Jul '12

Hello, In order to use Boost.Ratio with my poor compiler from TI, I had to apply the attached fix. I suspect a more general fix would be desirable, should such a fix be added to Boost. However, before investigating further, I'd like to ask, if such a fix would be welcome, or is my compiler too poor to be supported by Boost.Ratio? Regards, Kris

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boost.stratified -> boost.fiber
by Oliver Kowalke 04 Jul '12

04 Jul '12

Hi, as requested I've renamed boost.stratified to boost.fiber. archive is avialble at : http://olk.bplaced.net/boost-fiber.zip for those in Japan, Korea, etc please use http://www.hidemyass.com/ (proxy) to circumvent http 403 from the web-hoster. regards, Oliver

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[type_index] C++03 implementation in boost?
by Agustín K-ballo Bergé 03 Jul '12

03 Jul '12

After crafting my own `type_info_ptr` as a thin wrapper to be able to use `std::type_info` as key in maps, I found out about the new `std::type_index` in C++11. It seems that a C++03 implementation would be trivial, except for the hashing functionality. Could that functionality be built by leveraging implementation specific details like whether there is only one `type_info` instance for each type, or whether the name member function returns distinct values? I believe it would be a nice addition to Boost, perhaps as part of the utility library. It would be useful for those wanting to use C++11 features while still writing C++03 compatible code. Agustín K-ballo Bergé.- http://fusionfenix.com

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Large Integer Library
by Michael Tryhorn 03 Jul '12

03 Jul '12

Dear Boosters, I have written a Boost-compatible library for the representation and manipulation of integers of large or arbitrary size (including 128bit and above). I would like to make a preliminary submission of this library for your review and input, for potential inclusion into Boost v1.51.0 or later, as per the Boost Library Submission Process. The library and all its files are publicly available on github, at: http://github.com/mjtryhorn/Boost.LargeInt A tagged .zip of these files (v1.0.0) is available for download at: http://github.com/mjtryhorn/Boost.LargeInt/tags This library has been written for strict conformance to C++03 and the Boost coding guidelines. This library is also header-only, and as such may be directly merged into existing Boost installations without the need for recompilation. All files are distributed under the Boost Software License, Version 1.0. Now a quick explanation of why I've written this library and what it does: I have found myself on several occasions to be working with unsigned 64bit numbers, mostly for the sizes of files or C++ collections. Where I had a need to perform a calculation upon those numbers, there was often the possibility of overflow. 128bit integers would have been an appropriate fix, but these are either entirely unavailable, non-portable, or in a library which I preferred not to use either due to its complexity or incompatible licensing. Floating-point arithmetic is also a means around the problem, but is inherently inaccurate. I decided to fix this problem once-and-for-all by writing a new integer arithmetic library, making judicious use of C++'s template-metaprogramming and Boost to make my solution both as simple and as transparent as possible. Now, what started out as 128bit integers for my own use has grown into a fully- functional library which has the ability to compose any two integer or integer- like types into a new, larger, signed or unsigned integer type, including all the standard integral operators and a number of utility functions to support them. Thus, Boost.LargeInt supports not only signed and unsigned 128bit integer arithmetic but 24bit, 64bit, 160bit, 192bit, 256bit, 512bit and more. Boost.LargeInt is compatible and has been tested with the following compilers and platforms: GNU GCC 4.6.1, 4.6.2 (Linux, Ubuntu 11.10 (64bit) & openSUSE 12.1 (32bit)) Borland C++ 5.6.4 (Windows XP SP3, Borland C++ Builder 6) Microsoft Visual C++ 2010 (Windows XP SP3, Microsoft Visual Studio 2010) (I have also tried to add compatibility for Microsoft Visual C++ 6, but unfortunately this compiler's support for template-metaprogramming is insufficient and the tests for Boost.LargeInt fail to compile.) Documentation is included in BoostBook format (.qbk), but a pre-compiled version is available alongside the library code itself for your convenience. Please, if you have the time, download this library and give it a try. Any comments, or information upon its compatibility (or lack thereof) with compilers which are or are not listed would be greatly appreciated. If no-one has any comments (I think that unlikely ;-) ), then I shall resubmit this library for formal review. Thanks, Michael J. Tryhorn

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CRC 16 Bit Implementation
by GAURAV GUPTA 03 Jul '12

03 Jul '12

Hi, In my application I need to use crc_64_type. I did not find its implemetation in crc.hpp. Anyone implemented it? -- Regards, Gaurav

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[range] treating N-ary function with N-1 default args as unary
by Nathan Ridge 03 Jul '12

03 Jul '12

Hi, Some Boost.Range adaptors, such as 'transformed' or 'filtered', require a unary function. The documentation does not formally define "unary function", but it's pretty clear what it ought to be: a function (object) that's callable with one argument. Thus, to me, the following is a perfectly valid unary function: int foo(int a, int b = 0); as it is callable with one argument. However, Boost.Range does not accept such a function as an argument to 'transformed' or 'filtered'. For example, the following code: #include <boost/range/adaptor/transformed.hpp> int foo(int a, int b = 0); int main() { int A[5]; A | boost::adaptors::transformed(foo); } produces the following compiler errors (recent Boost trunk, with GCC 4.7): In file included from boost/preprocessor/iteration/detail/iter/forward1.hpp:52:0, from boost/utility/result_of.hpp:113, from boost/iterator/transform_iterator.hpp:23, from boost/range/adaptor/transformed.hpp:16, from test.cpp:1: boost/utility/detail/result_of_iterate.hpp: In instantiation of 'struct boost::detail::cpp0x_result_of_impl<int (* const(int&))(int, int)>': boost/utility/detail/result_of_iterate.hpp:46:8: required from 'struct boost::result_of<int (* const(int&))(int, int)>' boost/mpl/eval_if.hpp:38:31: required from 'struct boost::mpl::eval_if<boost::is_same<boost::use_default, boost::use_default>, boost::result_of<int (* const(int&))(int, int)>, boost::mpl::identity<boost::use_default> >' boost/iterator/iterator_adaptor.hpp:160:12: required from 'struct boost::detail::ia_dflt_help<boost::use_default, boost::result_of<int (* const(int&))(int, int)> >' boost/iterator/transform_iterator.hpp:50:17: required from 'struct boost::detail::transform_iterator_base<int (*)(int, int), int*, boost::use_default, boost::use_default>' c++/4.7.0/bits/stl_iterator_base_types.h:143:1: recursively required from 'constexpr const bool std::__has_iterator_category_helper<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >::value' c++/4.7.0/bits/stl_iterator_base_types.h:143:1: required from 'struct std::__has_iterator_category<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' c++/4.7.0/bits/stl_iterator_base_types.h:160:12: required from 'struct std::iterator_traits<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' boost/detail/iterator.hpp:81:8: required from 'struct boost::detail::iterator_traits<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' boost/iterator/iterator_traits.hpp:30:75: required from 'struct boost::iterator_value<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' boost/range/iterator_range_core.hpp:139:49: required from 'class boost::iterator_range<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' boost/range/adaptor/transformed.hpp:25:16: required from 'struct boost::range_detail::transformed_range<int (*)(int, int), int [5]>' test.cpp:8:41: required from here boost/utility/detail/result_of_iterate.hpp:69:5: error: too few arguments to function In file included from boost/range/iterator_range_core.hpp:22:0, from boost/range/iterator_range.hpp:13, from boost/range/adaptor/transformed.hpp:15, from test.cpp:1: boost/iterator/iterator_traits.hpp: In instantiation of 'struct boost::iterator_value<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >': boost/range/iterator_range_core.hpp:139:49: required from 'class boost::iterator_range<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' boost/range/adaptor/transformed.hpp:25:16: required from 'struct boost::range_detail::transformed_range<int (*)(int, int), int [5]>' test.cpp:8:41: required from here boost/iterator/iterator_traits.hpp:30:75: error: no type named 'value_type' in 'struct boost::detail::iterator_traits<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' boost/iterator/iterator_traits.hpp: In instantiation of 'struct boost::iterator_difference<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >': boost/range/iterator_range_core.hpp:143:54: required from 'class boost::iterator_range<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' boost/range/adaptor/transformed.hpp:25:16: required from 'struct boost::range_detail::transformed_range<int (*)(int, int), int [5]>' test.cpp:8:41: required from here boost/iterator/iterator_traits.hpp:49:80: error: no type named 'difference_type' in 'struct boost::detail::iterator_traits<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' boost/iterator/iterator_traits.hpp: In instantiation of 'struct boost::iterator_reference<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >': boost/range/iterator_range_core.hpp:157:53: required from 'class boost::iterator_range<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' boost/range/adaptor/transformed.hpp:25:16: required from 'struct boost::range_detail::transformed_range<int (*)(int, int), int [5]>' test.cpp:8:41: required from here boost/iterator/iterator_traits.hpp:36:74: error: no type named 'reference' in 'struct boost::detail::iterator_traits<boost::transform_iterator<int (*)(int, int), int*, boost::use_default, boost::use_default> >' Would it be possible to treat N-ary functions with N-1 default arguments as unary? Thanks, Nate

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[Trac] New components
by Daniel James 03 Jul '12

03 Jul '12

Hello, Please can someone with the appropriate trac permissions add two new components "functional/overloaded function" and "local function", both have maintainer "lcaminiti". Maybe also "utility/identity type", or does that come under "utility"? thanks, Daniel

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Thread (win32) and current_thread_tls_key issues
by Pekka Seppänen 03 Jul '12

03 Jul '12

Hi, Currently Threads's Win32 TLS implementation uses a global static variable thread::current_thread_tls_key that is defined in src/win32/thread.cpp. As you may know, static variables have a tendency of not being allocated in a very specific order. Say, that you have a statically allocated class A that ends up calling thread::set_current_thread_data() (eg. uses thread::thread_specific_ptr). If compiler initializes this class before it initializes current_thread_tls_key (this did happen to me on MSVC9) things go boom: a) Compiler initializes class A, thread::set_current_thread_data() is called, thread::create_current_thread_tls_key() is called once (as expected) and ::TlsAlloc() result is stored to thread::current_thread_tls_key. b) Compiler initializes thread::current_thread_tls_key, TLS_OUT_OF_INDEXES is stored and, as you may guess, c) Any following thread::set_current_thread_data calls will fail as the proper result from ::TlsAlloc() was overwritten. Don't know why this haven't happened before, as previous versions use a static variable, too. Maybe some compilers (MSVC in this case) omit initialization code unless initial value is a non-zero (as with TLS_OUT_OF_INDEXES [0xffffffff] in this case) value. I propose that thread::current_thread_tls_key is moved to a static function that sole purpose is to return reference to that variable (and thus ensure that current_thread_tls_key is initialized before it is used for the first time). Also, move thread::current_thread_tls_init_flag to thread::set_current_thread_data() to make sure this won't happen to that, too. Attached a patch that does the above trick (did move TLS_OUT_OF_INDEXES back to a macro as otherwise the code got too cumbersome, does get undef'd unless it was already defined by Winapi). If you like it, I can submit a ticket to Trac that includes the patch. (Haven't looked what happens during destruction, but guess it's not safe to use TLS features thru Thread.) -- Pekka

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memcpy handling bug in regex_raw_buffer.cpp
by GAURAV GUPTA 03 Jul '12

03 Jul '12

Can anyone verify and commit the following Ticket: https://svn.boost.org/trac/boost/ticket/7032 -- Regards, Gaurav

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Does Boost.Pool have a maintainer ?
by DUPUIS Etienne 03 Jul '12

03 Jul '12

Greetings, Does Boost.Pool have a maintainer ? If no, what happens in that case, who decides to include bug fixes for open bugs ? If there is no maintainer, can I become the maintainer ? If the answer to the latter question is yes, can someone volunteer to be my "mentor" to help me with issues related to the way boost development work ? I have already fixed pool bugs in the sandbox and added related test programs. Regards, Étienne Dupuis Ce message et toutes les pièces jointes sont confidentiels et établis à l'intention exclusive de ses destinataires. Toute modification, édition, utilisation ou diffusion non autorisée est interdite. Si vous avez reçu ce message par erreur, merci de nous en avertir immédiatement. ATEME décline toute responsabilité au titre de ce message s'il a été altéré, déformé, falsifié ou encore édité ou diffusé sans autorisation. This message and any attachments are confidential and intended solely for the addressees. Any unauthorized modification, edition, use or dissemination is prohibited. If you have received this message by mistake, please notify us immediately. ATEME decline all responsibility for this message if it has been altered, deformed, falsified or even edited or disseminated without authorization. Note: To protect against computer viruses, e-mail programs may prevent sending or receiving certain types of file attachments.

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