April 2011 - Boost - lists.preview.boost.org

Re: [boost] [shifted_ptr] Review Request
by Olaf van der Spek 07 Apr '11

07 Apr '11

On Wed, Apr 6, 2011 at 7:22 PM, Phil Bouchard <phil(a)fornux.com> wrote: > > > On 4/6/2011 9:58 AM, Olaf van der Spek wrote: >> >> What version of Boost was used? > > 1.34.1 > >> Does it use make_shared? > > No. Not very meaningful either, I'm afraid.

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[shifted_ptr] Review Request
by Phil Bouchard 06 Apr '11

06 Apr '11

Greetings, For those who are not aware in 2008 I wrote a memory manager running in real-time so that heap objects are being destructed instantly. A quick introduction can be found here: https://svn.boost.org/svn/boost/sandbox/shifted_ptr/libs/smart_ptr/doc/Shif… The library still needs more documentation but we can see the simplicity of its usage in its examples found in the sandbox. Here's a quick copy & paste compilation of the examples: $ svn co http://svn.boost.org/svn/boost/sandbox/shifted_ptr $ cd shifted_ptr/libs/smart_ptr/example $ make shifted_ptr_test1 $ make t100_test1 $ ./shifted_ptr_test1 $ ./t100_test1 "shifted_ptr_test1" shows its versatility and simplicity while "t100_test1" shows a more complicated application on a neural network. I would like to request a review while I add the necessary documentation for a better support. Thanks, -Phil

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Re: [boost] Python 3.2: convert convert PyObject* to PyUnicodeObject*?
by Ralf W. Grosse-Kunstleve 06 Apr '11

06 Apr '11

Thanks for the patch and the pointer. I just checked in the fix and closed the ticket. Ralf ----- Original Message ----- > From:Matthew Bradbury <matt-bradbury(a)live.co.uk> > To:boost@lists.boost.org > Cc: > Sent:Wednesday, April 6, 2011 3:43 AM > Subject:Re: [boost] Python 3.2: convert convert PyObject* to PyUnicodeObject*? > > Steve M. Robbins <steve <at> sumost.ca> writes: > > > > > Hi, > > > > Boost 1.46.1 fails to build with Python 3.2 on linux (Debian). The > > build fails with: > > > > error: cannot convert -F�PyObject*� to �PyUnicodeObject*� for argument �1� > to > �Py_ssize_t > > PyUnicodeUCS4_AsWideChar(PyUnicodeObject*, wchar_t*, Py_ssize_t)�-A > > > > at this code: > snip > > > > Is there an easy fix? > > > > Thanks, > > -Steve > > > Yes, I submitted a bug and a patch some time ago. > > https://svn.boost.org/trac/boost/ticket/4994 > > Matt > > > _______________________________________________ > Unsubscribe & other changes: > http://lists.boost.org/mailman/listinfo.cgi/boost

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Re: [boost] [range] for_each and std::map of std::list
by Thorsten Ottosen 06 Apr '11

06 Apr '11

Den 06-04-2011 16:03, Mark Snelling skrev: > Hi, > > Consider a map defined as... > > std::map< int, std::list< std::string > > my_map; > > I'm wondering if/how it's possible to use Boost.Range to call a function > on each std::string in each of the lists contained in the map. I have an > implementation below which works using a C++0x lambda function but am > curious if this can be done purely using Boost.Range? > > boost::for_each( > boost::adaptors::values( my_map), > []( const std::list< std::string >& my_list ) { boost::for_each( > my_list, some_func ); } ); > > ideas anyone? What we need is a generic range adaptor that can make a container of containers look like a "flat" sequence. I suggest the syntax rngOfContainers | boost::adaptors::flattened and the underlying iterator should be up to bidirectional (if the underlying two container types support it). Anyone interested in implementing this? -Thorsten

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Python 3.2: convert convert PyObject* to PyUnicodeObject*?
by Steve M. Robbins 06 Apr '11

06 Apr '11

Hi, Boost 1.46.1 fails to build with Python 3.2 on linux (Debian). The build fails with: error: cannot convert -F�PyObject*� to �PyUnicodeObject*� for argument �1� to �Py_ssize_t PyUnicodeUCS4_AsWideChar(PyUnicodeObject*, wchar_t*, Py_ssize_t)�-A at this code: static std::wstring extract(PyObject* intermediate) { std::wstring result(::PyObject_Length(intermediate), L' '); if (!result.empty()) { int err = PyUnicode_AsWideChar( intermediate , &result[0] , result.size()); if (err == -1) throw_error_already_set(); } return result; } Is there an easy fix? Thanks, -Steve

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[config] Boost PP and variadic macros
by Edward Diener 06 Apr '11

06 Apr '11

This is largely directed to John Maddock, the maintainer of config, but of course anyone else can respond who is interested. I have been working to integrate my VMD library, and essentially variadic macro support, into Boost PP, with help and discussion offline of Paul Mensonides. I am now at the testing phase and all is now going well. This is currently being done in a separate library but when Paul and I are satisfied we intend to update the trunk with our changes. The library is at https://svn.boost.org/svn/boost/branches/pplib/variadics. One problem that I have can be explained by the fact that Boost PP currently does not depend on any other Boost library, not even Boost config. The reason for this is that Boost PP has been designed to work with C compilers ( or C++ compilers in C mode ) as well as C++ compilers. This means that the code to detect variadic macro support in Boost is duplicated in two places, both in config, which I basically started with the blessing of John Maddock with the BOOST_NO_VARIADIC_MACROS macro, and in Boost PP in a configuration file which I have coded and essentially duplicates the code in config for variadic macro support. I do not like this. Duplicating functionality in two different places, even as simple as determining variadic macro support for compilers, is error prone and a maintenance problem. Changes in one place have to be done in the other, and this would need to constantly be tracked. My initial thought was to see if config could work with C compilers, but all investigation there has led me to believe that it would be too many unnecessary changes to config, would complicate config greatly, would need extensive testing against all compilers, and that since config is central to all of Boost such a potential massive change to it it is a bad idea. So my current thought is to remove the code in config which tests for variadic macro support for a given compiler, to determine if BOOST_NO_VARIADIC_MACROS should be set, into a separate header file for each compiler which might set BOOST_NO_VARIADIC_MACROS, and then #include that header file in the compiler's header file, at the place where currently the setting of BOOST_NO_VARIADIC_MACROS exists ( or possible at the end ). The separate header file itself for testing variadic macro support is easily C compatible and I could use it in my Boost PP configuration file. This would eliminate duplication of the code to test for variadic macro support in config and Boost PP while keeping the goal of allowing Boost PP to still work with C compilers. Is this possible/desirable as far as config goes ? It would only affect the current code for setting BOOST_NO_VARIADIC_MACROS, hardly a Boost world-shaking event, and can easily be done by me and tested in regression tests. If it is, one further consideration is that the code in the Boost PP configuration file still would have to internally duplicate the checking and order of each compiler in the 'select_compiler_config.h' in config, but this is at least much better, and much less of a maintenance problem for Boost PP, than having to duplicate the code for checking for variadic macro support itself. Even this could be worked around, with a probably undesirable change to 'select_compiler_config.h', which I will proceed to suggest nonetheless. If we could add to that file another set of #defines for the corresponding variadic macro checking header file for each compiler that needs it. Something like: #define BOOST_COMPILER_CONFIG_NVM "boost/config/compiler/somecompiler_nvm.hpp" then in my Boost PP config header file I could go: #include <boost/config/select_compiler_config.hpp> #ifdef BOOST_COMPILER_CONFIG_NVM #include BOOST_COMPILER_CONFIG_NVM #endif and I could then check BOOST_NO_VARIADIC_MACROS and this will work for C compilers ( 'select_compiler_config.hpp' itself has nothing related to C++ and should work with any C compiler AFAICS ). But I would understand that littering 'select_compiler_config.hpp' with another set of #defines just to satisfy my need in Boost PP may not be acceptable to the clean design of that file, even if it would eliminate my need to reduplicate its logic in the Boost PP configuration file for variadic macro support in Boost PP which I have created.

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archive_exception causes Link failure serialization
by Paul A. Bristow 06 Apr '11

06 Apr '11

I am trying to rebuild an existing demo program for Johan Rade's nonfinite facets from François Mauger The program was previously tested with Boost 1.44, gcc 4.4.1, Linux/i686 (32bits) Using MSVC 10, it compiles OK, but fails to link. Can anyone gives me any clues what I am doing wrong? Thanks! Paul ------ Rebuild All started: Project: nonfinite_num_serialization, Configuration: Release Win32 ------ nonfinite_num_facet_serialization.cpp Searching libraries Searching C:\Program Files\Microsoft SDKs\Windows\v7.0A\lib\kernel32.lib: <snip> Searching C:\Program Files\Microsoft Visual Studio 10.0\VC\lib\libcpmt.lib: Searching I:\boost-trunk\stage\lib\libboost_serialization-vc100-mt-s-1_47.lib: Finished searching libraries Creating library J:\Cpp\MathToolkit\test\Math_test\Release\nonfinite_num_serialization.lib and object J:\Cpp\MathToolkit\test\Math_test\Release\nonfinite_num_serialization.exp Searching libraries Searching C:\Program Files\Microsoft SDKs\Windows\v7.0A\lib\kernel32.lib: <snip> Searching C:\Program Files\Microsoft Visual Studio 10.0\VC\lib\libcpmt.lib: Searching I:\boost-trunk\stage\lib\libboost_serialization-vc100-mt-s-1_47.lib: Searching C:\Program Files\Microsoft Visual Studio 10.0\VC\lib\LIBCMT.lib: Searching C:\Program Files\Microsoft Visual Studio 10.0\VC\lib\OLDNAMES.lib: Finished searching libraries nonfinite_num_facet_serialization.obj : error LNK2001: unresolved external symbol "public: __thiscall boost::archive::archive_exception::archive_exception( enum boost::archive::archive_exception::exception_code,char const *,char const *)" (??0archive_exception@archive@boost@@QAE@W4exception_code@012@PBD1@Z) J:\Cpp\MathToolkit\test\Math_test\Release\nonfinite_num_serialization.exe : fatal error LNK1120: 1 unresolved externals I have just rebuilt this library I:\boost-trunk\stage\lib\libboost_serialization-vc100-mt-s-1_47.lib. Library directory is I:\boost-trunk\stage\lib;$(LibraryPath) and appears to searching in the right lib file. Runtime library is /MT for release (I have also tried debug with similar results). The following includes are used in the demo program #include <boost/cstdint.hpp> #include <boost/serialization/nvp.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/codecvt_null.hpp> Is there anywhere I should have told serialization/archive not to use exceptions?

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[chrono] Interoperability with ICL and common concepts
by Joachim Faulhaber 06 Apr '11

06 Apr '11

Hi Vicente and Boost Chronoists, thank you for implementing Boost.Chrono! It's a very fine piece of software :) Currently I'm checking out the usage of chrono types with icl::intervals and interval containers. Obviously, using intervals of chrono::time_points or chrono::durations can be an important use case. Also ICL already works well with other date and time data types from boost data_time, so chrono's interoperability should be at least as easy. A problem here is, that Icl, while working instantly with built in data types (e.g. int, short, double or even int*), for other numeric types (e.g. boost::rational) or types "based on integral types" (e.g. data_time::ptime) I needed to provide adapter code. I think it'd be ideal, if boost libraries interoperated with each other just out of the box, of course. To achive this, we have to find a common understanding of those concepts, that make a seamless interoperability work. I think, this is important work to be done, because it widens the view from one's own library perspective to a broader horizon of generic interplay. The problem: There is a minimal set of requirements that Icl expects for the domain types of intervals and interval containers (1) A zero element, more precisely an identity element w.r.t. the type's composition operation, which usually is +. An assumption that works well for all built in types and many STL-types is, that we get this element by the default constructor T(). (2) A strict weak ordering < (3) For all discrete types and for continuous numeric types: Operators ++, -- (Only pre-variants needed e.g. ++x) (3.1) For discrete types ++/-- increments/decrements by a *least step* (3.2) For continuous numeric types ++/-- increments/decrements by a *unit step*. Most of the functionality of Icl works if requirements (1) through (3) are met. In addition, there are some functions that require a distance type, but only for more specific types, namely for numeric types that use varying interpretations of the origin (zero), like epoch based date and time and pointer-addresses. BTW, do we already have a name for this type of concept? origin_based_equidistant_scalar origin_based_equidifferential_scalar because they are based to an arbitrary origin, but have comparable differences or distances. Or shorter equidistant_scalar equidifferential_scalar because if we emphasize, that by "comparable differences or distances", it is implied that the origin is choosable. May favorite is "equidistant_scalar". This concept reminds me of "Levels of measurement" http://en.wikipedia.org/wiki/Level_of_measurement (4) For such equidistant scalar types D the ICL assumes, that the type of the difference values of D is D::difference_type. To summarize, for a domain type Dom, Icl expects Dom(), <, ++, -- and if dom is a equidistant scalar type we expect an associated type Dom::difference_type to be defined. Now boost::chrono::duration (D1*) Has a default ctor that leaves the type undefined. (D2) Has <, Ok. (D3) Has ++, --, Ok. boost::chrono::time_point (T1) Has a default ctor that implements the semantics assumed by the ICL, Ok. (T2) Has <, Ok. (T3*) Does not have ++, --. (T4*) Does not have difference_type So I end up with 3 of my requirements not met (D1, T3, T4) D1: Default ctor for chrono::duration leaves objects undefined. I assume this is due to efficiency considerations, nevertheless unfavorable from the view point of my library. For all built in types and most of the STL there has been something like an intuitive maybe unconscious may be conscious agreement to assign the identity element w.r.t. the fundamental composing operation of the constructed object's type as the semantics of the default ctor. From an algebraic, generic and interoprability point of view (and IMHO) this is the best choice. This choice has not been taken for chrono::durations, which is a little inconsistent also, because interestingly for its chrono::time_point type the semantic is just the desired one. The possibility of default ctor customization is no remedy, because ICL should ideally be completely "chrono agnostic" and still interoperable. For the same reason duration::zero() is not an option. T3: chrono::time_point does not implement ++ and --. I assume this is because of the specific maths that is designed for chrono::time_points (P) and durations (D) where - : P x P -> D + : P x D -> P + : D x P -> P but + : P x P -> P //verboten But this should not be an argument against ++ and -- because the "least steppable unit" for integral rep types as well as the "unit" for floating point rep types, that is processed by ++ and -- is the same for time_points and durations. T4: Finally, difference_type as the associated type for time_point is not defined. IMO, it should be, because from a concept point of view, chrono::time_point falls in the same equidistant scalar concept that other types are in (e.g. T*, random_access_iterator<T>) and those associate a difference_type. These are the main problems of Icl/Chrono interoperability. There are a few minor ones as well. Let's discuss these first. I hope we can arrive at a solution, where Icl can be chrono agnostic and vica versa and still everything works well together. Based on that, we could fix similar issues for other libs like data_time. Cheers, Joachim -- Interval Container Library [Boost.Icl] http://www.joachim-faulhaber.de

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more details on the project idea Boost.Polygon edge, polyline and edge set concepts for GSOC 2011
by arunesh vikram 06 Apr '11

06 Apr '11

can i get more details on what topic you want me to emphasize on.... for this project like what should i know or requirements for this project. eagerly waiting for your reply...... Arunesh vikram

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Re: [boost] Student introduction - GSOC
by George Lucian CORLACIU 06 Apr '11

06 Apr '11

> > Hello, > > I hope is not too late to make my introduction and to express my interest > in 2 of the proposed ideas. > > 1. SIMD library > > 2. ConcepTraits library > > Please tell me if I can still apply, and if I can what should I do to > demonstrate my capabilities in order to get one of your slots in GSOC. > > > Short description: > > *About me* > > Name: George Lucian CORLACIU > > University: Universidad Politécnica de Madrid, Madrid, Spain > > Master: European Master on Software Engineering (Erasmus Mundus Programme > on Software Engineering) – 1st year > > Bachelor: University of Sibiu “Lucian Blaga”; Faculty of Engineering > “Hermann Oberth”, Computer Science Department (thesis - Designing and > developing a hardware + software system for creating panoramic pictures - > Grade 9.86) > > *Work experience* > > I have over three years work experience, almost one year as a Software > Tester for an automotive company where I used C and more than two years as a > Software Developer in a company where I was developing a Laboratory > information management system (LIMS), a web application in Asp.NET Ajax + > C#. > > *Coding ++* > > My coding skills, ordered by proficiency are: C#, C++, C, Asp.NET, Java, > ASM etc. > > Tools proficiency: Visual Studio, Builder, Eclipse etc. > > Taking some of the courses in the bachelor degree and master improved my > skills a lot in domains like: computer vision, compression, image > processing/compression, cryptography etc. > > > Regards, > > George Lucian CORLACIU >

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