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BoostCon 2011 in German IT news
by Boris Schaeling 24 May '11

24 May '11

I got BoostCon 2011 into the German IT news on http://www.heise.de/developer/artikel/developer_artikel_1247894.html. If someone wants to contact IT websites in other countries (after all as a C++ developer I want to read about things like BoostCon), have a look at the article. This should give you an idea how you could get in contact with websites and provide them the kind of news they want to publish. As the conference ended last week, it maybe makes sense to send out "press articles" again when the videos of the presentations are online. Boris

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How to determine if a function with a given signature is declared?
by andrew.beck＠astc-design.com 24 May '11

24 May '11

Hi, Newbie question follows... I've used BOOST_MPL_HAS_XXX_TRAIT_DEF in the past but recently needed to determine if a function was defined with a given signature. Searching boost::mpl, stackoverflow etc, I couldn't find anything to do what I needed. I've attached my solution below. Basically, I'm wondering if there is a boost::mpl solution or some other more elegant solution. thanks, andrew #include <boost/mpl/bool.hpp> #include <boost/mpl/assert.hpp> #define XXX_DEFINED(symbol) \ template <typename T, T* = symbol> \ struct check_ ## symbol \ { \ typedef void type; \ }; \ \ template <typename T, typename enable = void> \ struct symbol ## _defined : \ boost::mpl::false_ \ { }; \ \ template <typename T> \ struct symbol ## _defined<T, typename check_ ## symbol<T>::type > : \ boost::mpl::true_ \ { }; // declare a some_func(int) so we can see if its declared... void some_func(int) {} // defines some_func_defined template XXX_DEFINED(some_func); BOOST_MPL_ASSERT(( some_func_defined<void(int)> )); // some_func(double) hasn't been declared BOOST_MPL_ASSERT_NOT(( some_func_defined<void(double)> ));

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[function] Problem copying when constructed with a functor
by Edward Diener 24 May '11

24 May '11

This simple code: #include <boost/detail/lightweight_test.hpp> #include <boost/function.hpp> struct p_functor_class_int { p_functor_class_int() : data(50) { } int operator()() const { return data; } void operator()(int d) { data = d; } int data; }; int main() { boost::function<int ()> bfun(p_functor_class_int()); boost::function<int ()> bfun2(bfun); return boost::report_errors(); } gives compiler errors. On gcc-4.6 I get: "In file included from C:\Programming\VersionControl\boost/boost/function/detail/maybe_include.hpp:13:0, from C:\Programming\VersionControl\boost/boost/function/detail/function_iterate.hpp:14, from C:\Programming\VersionControl\boost/boost/preprocessor/iteration/detail/iter/forward1.hpp:47, from C:\Programming\VersionControl\boost/boost/function.hpp:64, from test_function_bug.cpp:2: C:\Programming\VersionControl\boost/boost/function/function_template.hpp: In static member function 'static R boost::detail::function::function_invoker0<FunctionPtr, R>::invoke(boost::detail::function::function_buffer&) [with FunctionPtr = boost::function<int()> (*)(p_functor_class_int (*)()), R = int]': C:\Programming\VersionControl\boost/boost/function/function_template.hpp:907:60: instantiated from 'void boost::function0<R>::assign_to(Functor) [with Functor = boost::function<int()> (*)(p_functor_class_int (*)()), R = int]' C:\Programming\VersionControl\boost/boost/function/function_template.hpp:722:7: instantiated from 'boost::function0<R>::function0(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = boost::function<int()> (*)(p_functor_class_int (*)()), R = int, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type = int]' C:\Programming\VersionControl\boost/boost/function/function_template.hpp:1042:16: instantiated from 'boost::function<R()>::function(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = boost::function<int()> (*)(p_functor_class_int (*)()), R = int, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type = int]' test_function_bug.cpp:15:37: instantiated from here C:\Programming\VersionControl\boost/boost/function/function_template.hpp:95:39: error: too few arguments to function C:\Programming\VersionControl\boost/boost/function/function_template.hpp:96:9: warning: control reaches end of non-void function [-Wreturn-type] " I am sure I must be doing something wrong but I can not see it.

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Review Wizard Report for May 2011
by Ronald Garcia 23 May '11

23 May '11

============================================== Review Wizard Status Report for May 2011 ============================================== News ==== 1. Process Library Rejected 2. Phoenix Library Accepted 3. XInt Library Rejected 4. Type Traits Extensions Accepted 5. Locale Library Accepted 6. Convert Library Withdrawn 7. Conversion Library Accepted Provisionally 8. Context Library Accepted Provisionally 9. Boost 1.46.1 Released Revised Libraries: Asio, Filesystem, Fusion, Graph, ICL, Math, Polygon, Proto, Property Tree, Signals2, TR1, Unordered Revised Tools: Quickbook Open Issues =========== The following libraries have been reviewed and await reports from their review managers: * AutoIndex(Tool) - reviewed May 2011; review manager: Daniel James. The following libraries have been accepted to Boost, but have not yet been submitted to SVN: * GIL.IO - accepted January 2011; author: Christian Henning. * Type Traits Extensions - accepted March 2011; author: Frederic Bron. The following libraries have been accepted and submitted to SVN, but have not yet appeared in a release: * Phoenix - accepted March 2011; author: Joel de Guzmann. * Move - accepted February 2011; author: Ion Gaztanaga. * Geometry Library - accepted November 2009; author: Barend Gehreis et al. * Ratio - accepted October 2010; author: Vicente Botet. * Chrono - accepted January 2011; author: Vicente Botet. The following libraries have been accepted provisionally to Boost, but have not been submitted for mini-review and full acceptance: * Switch - accepted provisionally January 2008; author: Steven Watanabe. * Log - accepted provisionally March 2010; author: Andrey Semashev. * Context - accepted provisionally May 2011; author: Oliver Kowalke. General Announcements ===================== As always, we need experienced review managers. The review schedule has grown substantially but we have few volunteers, so manage reviews if possible and if not please make sure to watch the review schedule and participate. Please take a look at the list of libraries in need of managers and check out their descriptions. In general review managers are active boost participants, including library contributors, infrastructure contributors, and other mailing list participants with a substantial track record of constructive participation. If you can serve as review manager for any of them, email Ron Garcia or John Phillips, "rxg at cs dot cmu dot edu" and "phillips at pacific dot mps dot ohio-state dot edu" respectively. We are also suffering from a lack of reviewers. While we all understand time pressures and the need to complete paying work, the strength of Boost is based on the detailed and informed reviews submitted by you. If you are interested in reviewing a library but won't have time during the review period, you can always prepare your review ahead of time. No rule says you can only work on a review during the review period. A link to this report will be posted to www.boost.org. If you would like us to make any modifications or additions to this report before we do that, please email Ron or John. The review schedule is an unordered list of the libraries awaiting review. As such, any library on the schedule can be reviewed once the developer is ready, a review manager has been secured, and the manager, developer, and wizards agree on a date to schedule the review. Review Schedule =============== * Join (M) * Pimpl (M) * Endian * Conversion * Sorting (M) * AutoBuffer * Containers * Lockfree * Fiber (M) * Quaternions, Vectors, Matrices (M) * Stopwatches * Variadic Macro Data (M) * Type Traits Introspection * Block Pointer (M) * Heaps * Assign v2 * Network (M) * Algorithm * Local (M) ``(M)`` marks libraries that need review managers. -------------------- Join ---- :Author: Yigong Liu :Review Manager: Needed :Download: http://channel.sourceforge.net/ :Description: Join is an asynchronous, message based C++ concurrency library based on join calculus. It is applicable both to multi-threaded applications and to the orchestration of asynchronous, event-based applications. It follows Comega's design and implementation and builds with Boost facilities. It provides a high level concurrency API with asynchronous methods, synchronous methods, and chords which are "join-patterns" defining the synchronization, asynchrony, and concurrency. Pimpl ----- :Author: Vladimir Batov :Review Manager: Needed :Download: | `Boost Vault <http://www.boost-consulting.com/vault/index.php?action=downloadfile&fil…>`__ | http://www.ddj.com/cpp/205918714 (documentation) :Description: The Pimpl idiom is a simple yet robust technique to minimize coupling via the separation of interface and implementation and then implementation hiding. This library provides a convenient yet flexible and generic deployment technique for the Pimpl idiom. It's seemingly complete and broadly applicable, yet minimal, simple and pleasant to use. Endian ------ :Author: Beman Dawes :Review Manager: Joel Falcou :Download: http://svn.boost.org/svn/boost/sandbox/endian/ :Description: Conversion ---------- :Author: Vicente Botet :Review Manager: Gordon Woodhull :Download: `Boost Vault <http://www.boostpro.com/vault/index.php?action=downloadfile&filename=co…>`__ :Description: Generic explicit conversion between unrelated types. Boost.Conversion provides: * a generic ``convert_to`` function which can be specialized by the user to make explicit conversion between unrelated types. * a generic ``assign_to`` function which can be specialized by the user to make explicit assignation between unrelated types. * conversion between ``std::complex`` of explicitly convertible types. * conversion between ``std::pair`` of explicitly convertible types. * conversion between ``boost::optional`` of explicitly convertible types. * conversion between ``boost::rational`` of explicitly convertible types. * conversion between ``boost::interval`` of explicitly convertible types. * conversion between ``boost::chrono::time_point`` and ``boost::ptime``. * conversion between ``boost::chrono::duration`` and ``boost::time_duration``. Sorting ------- :Author: Steven Ross :Review Manager: Needed :Download: `Boost Vault <http://www.boostpro.com/vault/index.php?action=downloadfile&filename=al…>`__ :Description: A grouping of 3 templated hybrid radix/comparison-based sorting algorithms that provide superior worst-case and average-case performance to std::sort: integer_sort, which sorts fixed-size data types that support a rightshift (default of >>) and a comparison (default of <) operator. float_sort, which sorts standard floating-point numbers by safely casting them to integers. string_sort, which sorts variable-length data types, and is optimized for 8-bit character strings. All 3 algorithms have O(n(k/s + s)) runtime where k is the number of bits in the data type and s is a constant, and limited memory overhead (in the kB for realistic inputs). In testing, integer_sort varies from 35% faster to 2X as fast as std::sort, depending on processor, compiler optimizations, and data distribution. float_sort is roughly 70% faster than std::sort. string_sort is roughly 2X as fast as std::sort. AutoBuffer ---------- :Author: Thorsten Ottosen :Review Manager: Robert Stewart :Download: http://www.cs.aau.dk/~nesotto/boost/auto_buffer.zip :Description: Boost.AutoBuffer provides a container for efficient dynamic, local buffers. Furthermore, the container may be used as an alternative to std::vector, offering greater flexibility and sometimes better performance. Containers ---------- :Author: Ion Gaztanaga :Review Manager: John Maddock :Download: `Boost Vault <http://www.boostpro.com/vault/index.php?action=downloadfile&filename=bo…>`__ :Documentation: `Boost Sandbox <http://svn.boost.org/svn/boost/sandbox/move/libs/container/doc/html/index.h…>`__ :Description: Boost.Container library implements several well-known containers, including STL containers. The aim of the library is to offers advanced features not present in standard containers or to offer the latest standard draft features for compilers that comply with C++03. Lockfree ------------------ :Author: Tim Blechmann :Review Manager: Hartmut Kaiser :Download: `Boost Vault <http://www.boostpro.com/vault/index.php?action=downloadfile&filename=bo…>`__ :Documentation: http://tim.klingt.org/boost_lockfree/ :Description: Lockfree provides implementations of lock-free data structures. Lock-free data structures can be accessed by multiple threads without the necessity of blocking synchronization primitives such as guards. Lock-free data structures can be used in real-time systems, where blocking algorithms may lead to high worst-case execution times, to avoid priority inversion, or to increase the scalability for multi-processor machines. Lockfree provides: * boost::lockfree::fifo, a lock-free fifo queue * boost::lockfree::stack, a lock-free stack Fiber ----- :Author: Oliver Kowalke :Review Manager: Needed :Download: `Boost Vault <http://www.boostpro.com/vault/index.php?action=downloadfile&filename=bo…>`__ :Description: C++ Library for launching fibers (micro-threads) and synchronizing data between the fibers. Quaternions, Vectors, Matrices ------------------------------ :Author: Emil Dotchevski :Review Manager: Needed :Download: http://www.revergestudios.com/boost-qvm/ :Description: QVM defines a set of generic functions and operator overloads for working with quaternions, vectors and matrices of static size. The library also defines vector and matrix data types, however it allows users to introduce their own types by specializing the q_traits, v_traits and m_traits templates. Stopwatches ----------- :Author: Vicente Botet :Review Manager: Anthony Williams :Download: `Boost Vault <http://www.boostpro.com/vault/index.php?action=downloadfile&filename=st…>`__ :Description: On top of the standard facilities of Boost.Chrono, Stopwatches provides: * Stopwatches: A facility to measure elapsed time with the ability to start, stop, suspend, or resume measurement. * Stopwatch concept * Scoped helper classes allowing to pairwise start/stop operations, suspend/resume and resume/suspend a Stopwatch. * stopwatch, model of Stopwatch capturing elapsed Clock times. * stopwatch_accumulator, model of Stopwatch capturing accumulated elapsed Clock times. * Stopclocks: a complete time reporting package that can be invoked in a single line of code. * stopwatch_reporter, convenient reporting to an output stream (including wide char streams) of the elapsed time of models of Stopwatch results. * stopclock<Clock> shortcut of stopwatch_reporter<stopwatch<Clock>> Variadic Macro Data ------------------- :Author: Edward Diener :Review Manager: Needed :Download: `Boost Sandbox <http://svn.boost.org/svn/boost/sandbox/variadic_macro_data/>`__ :Description: The variadic_macro_data library adds support and functionality for variadic macros to Boost as well as integrating variadic macros with the Boost PP library without changing the latter library in any way. Type Traits Introspection ------------------------- :Author: Edward Diener :Review Manager: Joel Falcou :Download: `Boost Sandbox <http://svn.boost.org/svn/boost/sandbox/tti/>`__ :Description: The TTI library, which is an abbreviation for the 'Type Traits Introspection' library, allows a programmer to introspect at compile time the inner elements of a C++ type. The introspection process depends on specifying the name of the inner element by different macros for different types of elements, and then using a generated metafunction to determine whether that element exists within the enclosing type. The inner elements which can be introspected are type, class template, member data, member function, static member data, and static member function. Block Pointer ------------- :Author: Phil Bouchard :Review Manager: Needed :Download: `Boost Sandbox <https://svn.boost.org/svn/boost/sandbox/block_ptr/>`__ :Description: Deterministic memory manager of constant complexity capable of handling cyclic collections. Heaps ----- :Author: Tim Blechmann :Review Manager: Andrew Sutton :Download: http://tim.klingt.org/git?p=boost_heap.git;a=snapshot;h=HEAD;sf=tgz :Description: The Heap library is an implementation of priority queues, data structures that order their elements priority. They are useful in a number of different applications especially graph search algorithms and queuing systems. Whereas the STL provides a class template std::priority_queue, Boost.Heap implements data structures with different features and performance characteristics. One key feature is the inclusion of "mutable" heaps, which allow the priorities of enqueued objects to modified and their position in the queue updated. The heaps in the library also support merging, stable sorting, and equality and less-than comparison. Assign v2 --------- :Author: Erwann Rogard :Review Manager: John Bytheway :Download: `Boost Sandbox <http://svn.boost.org/svn/boost/sandbox/assign_v2>`__ :Description: This library is an upgrade of Boost.Assign 1.0 that redefines its functionality, with optional C++0x support and new features. It expresses repetitive statements for assigning or inserting elements via a basic grammar. Network ------- :Author: Dean Michael Berris :Review Manager: Needed :Download: http://cplusplus-soup.com/2011/04/18/cpp-netlib-0-9-0-released/ :Description: This is a library that provides application layer protocol support using modern C++ techniques. It is light-weight, fast, cross-platform and is intended to be as easy to configure as possible. Algorithm --------- :Author: Marshall Clow :Review Manager: Dave Abrahams :Download: `Boost Sandbox Vault <http://www.boostpro.com/vault/index.php?action=downloadfile&filename=Boost.…>`__ :Description: Boost.Algorithm is a collection of general purpose algorithms. While Boost contains many libraries of data structures, there is no single library for general purpose algorithms. Even though the algorithms are generally useful, many tend to be thought of as "too small" for Boost. An implementation of Boyer-Moore searching, for example, might take a developer a week or so to implement, including test cases and documentation. However, scheduling a review to include that code into Boost might take several months, and run into resistance because "it is too small". Nevertheless, a library of tested, reviewed, documented algorithms can make the developer's life much easier, and that is the purpose of this library. Local ----- :Author: Lorenzo Caminiti :Review Manager: Needed :Download: `Boost Sandbox <http://svn.boost.org/svn/boost/sandbox/local/>`__ :Description: This library supports local functions, local blocks, and local exits Libraries under development =========================== See http://svn.boost.org/trac/boost/wiki/LibrariesUnderConstruction for a current listing of libraries under development.

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[exception] warnings on top of trunk
by Bryce Lelbach 23 May '11

23 May '11

/opt/boost/trunk/stage/gcc-4.4.4-release/include/boost/exception/detail/exception_ptr.hpp: In function ‘void boost::rethrow_exception(const boost::exception_ptr&)’: /opt/boost/trunk/stage/gcc-4.4.4-release/include/boost/exception/detail/exception_ptr.hpp:458: warning: ‘noreturn’ function does return Is it cool for me to remove this attribute? -- Bryce Lelbach aka wash boost-spirit.com px.cct.lsu.edu github.com/lll-project

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[Review] Type Traits Extension by Frederic Bron - Review summary and decision
by Joel Falcou 23 May '11

23 May '11

Hello all, Frederic Bron's type traits extension proposal review ended up last week. In so far, we received SEVEN reviews which are all voting YES for the inclusion of Type Traits extension in Boost. So the result is that the Type Traits Extension is ACCEPTED into Boost. Suggestions include: - some clean-up in the implementation like "Renam[ing] the detail classes inside the specific namespace without using number, i.e. with a clear meaning. The use of tag, tag 2 could be renamed check_pass, check_fail or something like that." - Sensibility on cv-ref qualifiers in traits call is important. This is being addressed by Frederic. - Frederic is OK to keep the detection of void as a valid return type by using some dont_check type as default. - small comprehensive example of some of the traits like a "maybe_print function, which prints a value if the appropriate operator<< ostream overload exists, else prints "<NOT PRINTABLE>". [...] a small example like this would show a practical use of the library, and how to make use of enable_if, or some other overload method." - The main recurring suggestions found was the choice of name for the operator traits with respect to the standard naming, naming in proto and other boost libraries. This topic is still hot and alive. An alternative to the naming scheme consensus was proposed in the form of alias of commonly used operator traits. This issue is I think beyond bikeshed-color argumentation and I think it is a good point if Frederic could step up and provide a definite and rationalized answer to this point. The current status is : * the namespace options is out casue the standard didnt choose this way; * Frederic and a few other seems to favor the proto naming scheme (more or less the negate issue and the pre/post operator) * the question of a common prefix is still open * the std:: like naming seems limited as not all operators are there. Thanks to all reviewers and people participating to the discussions. Thanks to Frederic for his work.

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Small nitpick in boost::iterator
by Joel Falcou 23 May '11

23 May '11

Seems boost.Iterator pass some parameter by value in the make(Reference r) function. However, MSVC 2010 and I suspect below dont like passing value which alignment is greater than 8 ( **cough** SIMD vector **cough** ) The fix is trivial, adding const & to this function. Should I go ahead and commit this to trunk ?

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[pool] pool-based allocators and order of destruction
by John Maddock 23 May '11

23 May '11

I'm looking for second opinions on this bug report: https://svn.boost.org/trac/boost/ticket/5526#comment:1 The issue is this: if you use singleton_pool either directly or indirectly (via [fast_]pool_allocator), there is a potential order-of-destruction issue if you use it from within globally declared objects. I *think* it's OK, if the global object directly uses the singleton pool - or is it? But, things get really nasty if it's used indirectly as in the bug report via a thread_specific_ptr - the latter gets destructed very late - much later than the pool which is used by the object it points to, so the result is a program crash on exit. In general though, anything that uses indirection and "late initialization, late destruction" will cause problems. I see a number of solutions: * Document the limitation and leave it at that. * Make the singleton eternal and leak the pool's memory at program exit. * Use some kind of complex reference counting scheme so the pool is only destroyed when all it's memory has been released *and* main has exited. To be honest, I'm not thrilled by any of the above, but any opinions? Thanks in advance, John.

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Boost.Log status
by Vicente BOTET 23 May '11

23 May '11

Hi, what is going on Boost.Log? The library was accepted provisionally on March 2010 * Log - accepted provisionally March 2010; author: Andrey Semashev. Best, Vicente

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[review][autoindex] AutoIndex review ends tomorrow
by Daniel James 23 May '11

23 May '11

Hello everyone, Just a quick reminder that Saturday 21st May is the final day for the AutoIndex review. I'm going to wait for one final review before announcing the result, but other than that you need to contact me by then. thanks, Daniel James AutoIndex Review Manager

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