May 2009 - Boost - lists.preview.boost.org

Boost Libraries under development: Bitfields
by vicente.botet 13 May '09

13 May '09

Hi, I have adapted the Bitfield library from Emile Cormier with its permision. Boost.Bitfield consists of: a.. a generic bitfield traits class providing generic getter and setter methods. b.. a BOOST_BITFIELD_DCL macro making easier the definition of the bitfield traits and the bitfield getter and setter functions. struct X { typedef boost::ubig_32 storage_type; storage_type d0; typedef unsigned int value_type; BOOST_BITFIELD_DCL(storage_type, d0, unsigned int, d00, 0, 10); BOOST_BITFIELD_DCL(storage_type, d0, unsigned int, d01, 11, 31); }; The library is quite stable but I want to add some test with Boost.Endian before adding it to the formal review schedule list. Here is the link from which you can get the library code + documentation + test https://svn.boost.org/trac/boost/wiki/LibrariesUnderConstruction#Boost.Bitf… I'd appreciate if people could take a look, test it on their compiler and give me some feedback. Thanks for all, _____________________ Vicente Juan Botet Escribá

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[1.40.0] OK to build release?
by Beman Dawes 13 May '09

13 May '09

There has been little feedback on the 1.40.0 beta release. I'm hoping that is a good sign:-) Unless someone objects, I'll start building the actual release in an hour or so. --Beman

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Boost Install Target
by Esben Stien 13 May '09

13 May '09

I guessed that I had to run bjam install and it worked, but this was not mentioned in the manual, getting started guide. -- Esben Stien is b0ef@e s a http://www. s t n m irc://irc. b - i . e/%23contact sip:b0ef@ e e jid:b0ef@ n n

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[sorting] Implementation of histogram sort
by Jeremiah Willcock 12 May '09

12 May '09

Does the proposed Boost sorting library contain an implementation of histogram sort or some other in-place variant of bucket sort (American flag sort, etc)? I would like to use an integer sort for a problem I have but need to save as much memory as possible. Having one element of temporary storage per bucket is fine, though. -- Jeremiah Willcock

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SafeInt library for Boost
by Omer Katz 12 May '09

12 May '09

Hi everyone, I am considering adding a safeInt library to Boost. If there are any suggestions regarding a special content of such a library, or any special implementation ideas, I'll be glad if you'd let me know. right now I plan to use a template class for it. I'll be glad to accept your comments. Regards, Ziv

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structure alignment
by Christoph Macheiner 12 May '09

12 May '09

(Long-time reader, first-time poster) Hi all Recently I wanted to upgrade from 1.33 and got build errors in boost format. It is a quite large codebase which, for legacy reasons, has to be built with 1-byte structure alignment (this cannot easily be changed). The error comes from an boost::optional<boost::io::detail::locale_t> in boost/format/internal.hpp that wants to be 4-byte aligned (platform is Win32 vc9). Now I cannot just include this (or all) boost headers with 4- (or 8-)byte alignment because they include other std headers which have already been included before (with 1-byte alignment). Is there an easy solution to this that I am missing despite changing all includes? Is there information on such interdependencies somewhere? Or do I have to bite the bullet and include all standard headers with a suitable alignment. I am sorry if this has been discussed before, but I could not find anything. Thanks, Christoph.

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[trac] version 1.39.0 in trac
by Michael Caisse 12 May '09

12 May '09

Version: Boost 1.39.0 needs to be added in trac for tickets. Thank you - Michael -- ---------------------------------- Michael Caisse Object Modeling Designs www.objectmodelingdesigns.com

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Bounded String
by vicente.botet 12 May '09

12 May '09

Hi, I was looking for a bounded capacity string and I have take a look to the review (2006) of the rejected FixedString library (http://www.boostpro.com/vault/index.php?action=downloadfile&filename=fixed_…) Here follows a brief compilation of the main points * A motivating use case was missing * the motivating example (printf) was not enough significant, when we have the choice we can always find a better class. * The design was not adapted to the goals * the inheritance hierarchy was considered to complicated needing an allocation * buffer overrun should be configurable - truncate, exception, assert, * The formating should be considered orthogonal to the fixed_string class The context where I need to use something like this class is: * the binary layout can not be modified and must be bounded due to legacy issues, Third Party Products interfaces, protocol messages format or bounded capacity strings on persistent databases. * overrun must be checked because otherwise the program can crash. I will propose to name it bounded_c_string (when _c_ stands for "C-style" but recalls also capacity) These are the requirements I would associate to such a class * the value must always be a C-string (so with a trailing '\0') * The layout of a bounded_c_string<N> class must be the same as its counterpart C-string char[N] (sizeof(bounded_c_string<N>==N) * As a lot of code can use this type the refactoring from C code using char[N] to bounded_c_string<N> should be reduced to the type declaration (overloading of all the C string functions with bounded_c_string<N> are a must) * the efficiency must be equivalent to the hand written C-style * convertible to and from C-strings, std::string and other bounded_c_string<M> * C++ std::string like interface must also be provided Note that there is not issues with the length of the string coherency because not stored. This class do not intends to use dynamic memory when fixed capacity is not enough (see AutoBuffer library http://www.cs.aau.dk/~nesotto/boost/auto_buffer.zip for this use case) I don't know which is the FixedString library, the last upload on the Vault dates from 08.01.2006. Is there an interest for this simple class? Do you agree with the requirements? Is there an interest for a bounded_c_memory class which will take care of the length of the significant data instead of the trailing '\0'? Best regards, _____________________ Vicente Juan Botet Escribá

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[GIL.IO] Looking for a review manager
by Christian Henning 12 May '09

12 May '09

Hi there, I'm looking for a review manager for the new GIL.IO extension. Anyone around here who would like to volunteer? Regards, Christian

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Requesting interest in a bounded capacity C-string
by vicente.botet 12 May '09

12 May '09

Hi, I was looking for a bounded capacity string and I have take a look to the review (2006) of the rejected FixedString library (http://www.boostpro.com/vault/index.php?action=downloadfile&filename=fixed_…) Here follows a brief compilation of the main points * A motivating use case was missing * the motivating example (printf) was not enough significant, when we have the choice we can always find a better class. * The design was not adapted to the goals * the inheritance hierarchy was considered to complicated needing an allocation * buffer overrun should be configurable - truncate, exception, assert, * The formating should be considered orthogonal to the fixed_string class The context where I need to use something like this class is: * the binary layout can not be modified and must be bounded due to legacy issues, Third Party Products interfaces, protocol messages format or bounded capacity strings on persistent databases. * overrun must be checked because otherwise the program can crash. I will propose to name it bounded_c_string (when _c_ stands for "C-style" but recalls also capacity) These are the requirements I would associate to such a class * the value must always be a C-string (so with a trailing '\0') * The layout of a bounded_c_string<N> class must be the same as its counterpart C-string char[N] (sizeof(bounded_c_string<N>==N) * As a lot of code can use this type the refactoring from C code using char[N] to bounded_c_string<N> should be reduced to the type declaration (overloading of all the C string functions with bounded_c_string<N> are a must) * the efficiency must be equivalent to the hand written C-style * convertible to and from C-strings, std::string and other bounded_c_string<M> * C++ std::string like interface must also be provided Note that there is not issues with the length of the string coherency because not stored. This class do not intends to use dynamic memory when fixed capacity is not enough (see AutoBuffer library http://www.cs.aau.dk/~nesotto/boost/auto_buffer.zip for this use case) I don't know which is the FixedString library, the last upload on the Vault dates from 08.01.2006. Is there an interest for this simple class? Do you agree with the requirements? Is there an interest for a bounded_c_memory class which will take care of the length of the significant data instead of the trailing '\0'? Best regards, _____________________ Vicente Juan Botet Escribá

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