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circular_buffer_space_optimized possible bug
by Birju Prajapati 24 Feb '09

24 Feb '09

Hi, When I run the following code: int main() { boost::circular_buffer_space_optimized<int> buf; std::cout << buf.size() << std::endl; buf.push_back(1); std::cout << buf.size() << std::endl; } I get the output 0 0 Is this a bug? This is boost 1.38, gcc 4.3.2 It works fine with boost 1.35, gcc 4.1.2 (gives the output 0,1) TIA Birju Schneider Trading 4th Floor, 25 Copthall Avenue London EC2R 7BP -------------------------------------------------------- Message from: Birju.Prajapati(a)schneidertrading.com Message to: boost-users(a)lists.boost.org Attached files: 0 This e-mail and any files transmitted with it are confidential, may be legally privileged, and are for the sole use of the intended recipient. Copyright in this e-mail and any accompanying document created by us is owned by us. If you are not the intended recipient of this e-mail or any part of it please telephone our IT Department at the number shown above or by e-mail at info(a)schneidertrading.com. You should not use or disclose to any other person the contents of this e-mail or its attachments (if any), nor take copies. This e-mail is not a representation or warranty and is not intended nor should it be taken to create any legal relations, contractual or otherwise. Schneider Trading Associates Ltd (Registration No. 3692131) is incorporated in England and Wales and the registered office is at 25 Copthall Avenue, London EC2R 7BP. The company is authorised and regulated by the Financial Services Authority

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How to access each elements of a thread group separately
by Johan Mazel 24 Feb '09

24 Feb '09

Hi I'm using several threads to do some parallel work. But I need to stop them separatly through the interrupt method. In order to store all these threads, I thought that I would use the thread_group class since I cannot use the vector class. But it looks like I cannot acces an element of a thread group (to interrupt it separately for example). Is there anyway of doing this that I'm not aware of ? Thanks in adavnace for the help. Johan Mazel

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boost::serialization - track_never, load and save in cpp file?
by Martin Trappel 24 Feb '09

24 Feb '09

Hi. To support the serialization of a class I don't want to change anything, I have added free save and load function. (See the test code below.) It compiles and appears to work. I have the following questions: * Is it OK to put the save & load definitions in a separate implementation file? * Is it OK to specify track_never in a cpp file? Will this cause problems if someone else tries to serialize a map<int, string> ? thanks! - Martin - global_serialization.h - // ... class MyComplexClass; // ... namespace boost { namespace serialization { // Declare save and load for MyComplexClass template<class Archive> void save(Archive & ar, const MyComplexClass& t, unsigned int version); template<class Archive> void load(Archive & ar, MyComplexClass& t, unsigned int version); } } // Split: BOOST_SERIALIZATION_SPLIT_FREE(MyComplexClass); ***** - complex_class_serialization.cpp - // ... #include "ComplexClass.h" // ... typedef std::map<int, std::string ser_map_t; BOOST_CLASS_TRACKING(ser_map_t, boost::serialization::track_never); namespace boost { namespace serialization { template<class Archive> void save(Archive & ar, const MyComplexClass& t, unsigned int version) { // the relevant information to be serialized for // instances of MyComplexClass can be represented // by a map<int, string> ser_map_t m; // ... fill m object from t object ar << m; // Serialize } template<class Archive> void load(Archive & ar, CBoxHandler & t, unsigned int version) { ser_map_t m; ar >> m; // ... init t object from m } } // namespace serialization } // namespace boost

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[mpl & type_traits]
by Robert Jones 24 Feb '09

24 Feb '09

Simple questions from a metaprogramming newbie... Why do we have mpl::true_ and true_type? Are they interchangable? Is is_same the same as mpl::equal? Thanks, Rob.

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Problem with regular expression's validity and matching
by Paulino De Assis Fong 24 Feb '09

24 Feb '09

Hi, I have two problems that I would need some help. Thanks in advance. Question 1: Please consider the regular expression to match US phone number below: ((\(\d{3}\)?)|(\d{3}))([\s-./]?)(\d{3})([\s-./]?)(\d{4}) boost doesn't like it and it will throw an exception for the code below while it seems to be fine in online regex tester and .Net Regex library. I don't know what is imcompatiable with boost regex library. Please advice. try { boost::wregex expr(csRegex, boost::regex::normal | boost::regbase::icase); } catch (boost::exception const& e) { } Question 2: Please consider the regular expression to match US SSN below: (?!000)([0-6]\d{2}|7([0-6]\d|7[012])) ([ -])? (?!00)\d\d([ -|])? (?!0000)\d{4} It didn't throw an exception for this regular expression but it wasn't able to match any SSN at all in any format while it matches fine using other regular expression engine. Am I missing something? if (expr.expression()) { // Boost Regex usage flags boost::regex_constants::match_flag_type flags = boost::regex_constants::match_normal; // Start the boost regular expression iterator boost::wcregex_iterator start(boost::make_regex_iterator (StringToMatch, expr, flags)), end; while (start != end) { boost::match_results<const wchar_t*> match = *start; . . . } }

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Boost's automatic selection of debug vs release libaries on link - how to disable?
by Damien Hocking 24 Feb '09

24 Feb '09

Hello everyone, I've noticed that when linking Boost libraries, the linker implicitly knows whether it requires a debug or a release Boost library, and what the full name of the library is. E.g. on Windows the linker wants "boost_serialization-vc80-mt-d-1_37.lib" in debug and "boost_serialization-vc80-mt-1_37.lib" in release. I'm working in an SCons build system where SCons runs the show and the Boost libraries will be custom-renamed and the linker told specifically what libraries to link. Is there any way to disable this implicit naming feature in the bjam build step through a compiler option? Damien

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Release notes for Boost.Test
by Ross Boylan 24 Feb '09

24 Feb '09

http://www.boost.org/doc/libs/1_38_0/libs/test/doc/html/intro.html says --------------------------------- Release notes For more details see complete release notes. --------------------------------- There are no hyperlinks in that text. What is this referring to? It does not seem to be the global release notes, which don't mention changes in test even when they occurred (e.g., 1.33). Nor can I find something in the docs for test, or groping around in the svn source tree. Ideally, I'd like a history of changes across different releases, so I know what I need to make my code compatible with the different versions. I'm hoping for something a little higher level than svn diff. Thanks. Ross Boylan

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[boost::system] Is the library abstraction general enough?
by Lian Cheng 24 Feb '09

24 Feb '09

Hi, all I'm currently building an asynchronous MySQL client API based on Boost.Asio, whose error handling is based on Boost.System. And thus, I wrote some code to wrap MySQL error codes and error messages with Boost.System. While writing the code, I found that the library doesn't provide a general enough abstraction. As the document says, there should always be only one instance of each error_category class. And each error_code instance communicates with its error_category through only the error number. Then here is the problem. MySQL error code is a property of a single MySQL connection. The mysql_errno() and mysql_error() functions both require a MYSQL* connection handle as parameter to retrieve the last error number and error message of the given MySQL connection. And the error messages provided by MySQL API are actually printf format strings. The mysql_error() function fills the format strings with information related to the MYSQL* handle. But in Boost.System, I've got no idea how to pass the connection handle to the error_category::message() function so that a proper error message can be retrieved. Is there any way to fix this problem? Or the library itself is just not general enough? You see, not all error numbers can be directly mapped to a well defined error message string. Cheers Cheng

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[signals2] VS 2005 error with deconstruct.hpp
by Nat Goodspeed 24 Feb '09

24 Feb '09

One small glitch in the 2009-02-11 signals2 snapshot [1]. When a source file containing only: #include <boost/signals2.hpp> is compiled with Visual Studio 2005, it produces: cl /EHsc /I libraries/include signals2-glitch.cpp Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86 Copyright (C) Microsoft Corporation. All rights reserved. signals2-glitch.cpp libraries/include\boost/signals2/deconstruct.hpp(510) : error C2874: using-declaration causes a multiple declaration of 'boost::signals2::detail::deconstruct_access' libraries/include\boost/signals2/deconstruct.hpp(233) : see declaration of 'boost::signals2::detail::deconstruct_access' This is the line in question, near the bottom of boost/signals2/deconstruct.hpp: using detail::deconstruct_access; I'm not sure what the intent is for that line, but removing it solves that problem without, as far as I'm aware, introducing new problems. I've attached a patch file. This line caused me no problems on Mac or Linux. Neither does its removal. [1] http://www.boostpro.com/vault/index.php?action=downloadfile&filename=signal… *** boost/signals2/deconstruct.hpp~ Thu Feb 5 18:58:10 2009 --- boost/signals2/deconstruct.hpp Mon Feb 23 15:05:44 2009 *************** *** 507,514 **** return detail::deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5,a6,a7,a8,a9); } - using detail::deconstruct_access; - #endif } // namespace signals2 --- 507,512 ----

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Re: [Boost-users] boost::exception - leaking error_info
by Bruce Laing 24 Feb '09

24 Feb '09

> Re: [Boost-users] boost::exception - leaking error_info > Date: Mon, 23 Feb 2009 11:01:08 -0800 > From: Emil Dotchevski <emildotchevski(a)gmail.com> > Subject: Re: [Boost-users] boost::exception - leaking error_info > On Mon, Feb 23, 2009 at 9:31 AM, Bruce Laing > <bruce.laing(a)eng-software.com> wrote: > > Emil, > > > > The platform is vc++ 8, boost 1.37. > > > > Please do keep us posted, it's kind of important for exception objects > not to leak memory. :) Emil, Quick update: my problem seems to have been due to conflicting instances of the runtime library coming into the link. I haven't determined which component is bringing in the dynamic CRT, but in any case, changing /MTd to /MDd fixes the leak, indicating a problem in my project setup and compiler/linker switches, rather than a problem with either boost::exception or the way my code was using the library. - Bruce

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